//------------------------------------------------------------------------------
//	Copyright (c) 2001-2004, Haiku
//
//	Permission is hereby granted, free of charge, to any person obtaining a
//	copy of this software and associated documentation files (the "Software"),
//	to deal in the Software without restriction, including without limitation
//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
//	and/or sell copies of the Software, and to permit persons to whom the
//	Software is furnished to do so, subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in
//	all copies or substantial portions of the Software.
//
//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//	DEALINGS IN THE SOFTWARE.
//
//	File Name:		TextView.cpp
//	Authors:		Hiroshi Lockheimer (BTextView is based on his STEEngine)
//					Marc Flerackers (mflerackers@androme.be)
//					Stefano Ceccherini (burton666@libero.it)
//	Description:	BTextView displays and manages styled text.
//------------------------------------------------------------------------------

// TODO: 
// - Finish documenting this class
// - Consider using _PointerList_/BObjectList instead of BList
// for disallowed charachters (it would remove a lot of reinterpret_casts)


// Standard Includes -----------------------------------------------------------
#include <cstdlib>
#include <cstdio>

// System Includes -------------------------------------------------------------
#include <Application.h>
#include <Beep.h>
#include <Bitmap.h>
#include <Clipboard.h>
#include <Errors.h>
#include <Input.h>
#include <Message.h>
#include <PropertyInfo.h>
#include <Region.h>
#include <ScrollBar.h>
#include <TextView.h>
#include <Window.h>

// Local Includes --------------------------------------------------------------
#include "LineBuffer.h"
#include "StyleBuffer.h"
#include "TextGapBuffer.h"
#include "UndoBuffer.h"
#include "WidthBuffer.h"

// Local Defines ---------------------------------------------------------------
//#define TRACE_TEXTVIEW
#ifdef TRACE_TEXTVIEW
	#define CALLED() printf("%s\n", __PRETTY_FUNCTION__)
#else
	#define CALLED()
#endif


struct flattened_text_run {
	int32	offset;
	char	family[64];
	char	style[64];
	float	size;
	float	shear;		/* typically 90.0 */
	uint16	face;		/* typically 0 */
	uint8	red;
	uint8	green;
	uint8	blue;
	uint8	alpha;		/* 255 == opaque */
	uint16	_reserved_; /* 0 */
};


struct flattened_text_run_array {
	uchar				magic[4];	/* 41 6c 69 21 */
	uchar				version[4];	/* 00 00 00 00 */
	int32				count;
	flattened_text_run	styles[1];
};


enum {
	B_SEPARATOR_CHARACTER,
	B_OTHER_CHARACTER
} separatorCharacters;


// _BTextTrackState_ class -----------------------------------------------------
class _BTextTrackState_ {

	// TODO: Implement ? 
public:
	_BTextTrackState_(bool inSelection)
		:	fMoved(false),
			fInSelection(inSelection)
	{}

	bool	fMoved;
	bool	fInSelection;
};


// Globals ---------------------------------------------------------------------
static property_info
sPropertyList[] = {
	{
		"Selection",
		{ B_GET_PROPERTY, 0 },
		{ B_DIRECT_SPECIFIER, 0 },
		"Returns the current selection.", 0,
		{ B_INT32_TYPE, 0 }
	},
	{
		"Selection",
		{ B_SET_PROPERTY, 0 },
		{ B_DIRECT_SPECIFIER, 0 },
		"Sets the current selection.", 0,
		{ B_INT32_TYPE, 0 }
	},
	{
		"Text",
		{ B_COUNT_PROPERTIES, 0 },
		{ B_DIRECT_SPECIFIER, 0 },
		"Returns the length of the text in bytes.", 0,
		{ B_INT32_TYPE, 0 }
	},
	{
		"Text",
		{ B_GET_PROPERTY, 0 },
		{ B_RANGE_SPECIFIER, B_REVERSE_RANGE_SPECIFIER, 0 },
		"Returns the text in the specified range in the BTextView.", 0,
		{ B_STRING_TYPE, 0 }
	},
	{
		"Text",
		{ B_SET_PROPERTY, 0 },
		{ B_RANGE_SPECIFIER, B_REVERSE_RANGE_SPECIFIER, 0 },
		"Removes or inserts text into the specified range in the BTextView.", 0,
		{ B_STRING_TYPE, 0 }
	},
	{
		"text_run_array",
		{ B_GET_PROPERTY, 0 },
		{ B_RANGE_SPECIFIER, B_REVERSE_RANGE_SPECIFIER, 0 },
		"Returns the style information for the text in the specified range in the BTextView.", 0,
		{ B_RAW_TYPE, 0 },
	},
	{
		"text_run_array",
		{ B_SET_PROPERTY, 0 },
		{ B_RANGE_SPECIFIER, B_REVERSE_RANGE_SPECIFIER, 0 },
		"Sets the style information for the text in the specified range in the BTextView.", 0,
		{ B_RAW_TYPE, 0 },
	},
	{ 0 }
};


// Initialized/finalized by init/fini_interface_kit
_BWidthBuffer_* BTextView::sWidths = NULL;
sem_id BTextView::sWidthSem = B_BAD_SEM_ID; 
int32 BTextView::sWidthAtom = 0;


BTextView::BTextView(BRect frame, const char *name, BRect textRect,
					 uint32 resizeMask, uint32 flags)
	:	BView(frame, name, resizeMask,
				flags | B_FRAME_EVENTS | B_PULSE_NEEDED | B_INPUT_METHOD_AWARE)
{
	CALLED();
	InitObject(textRect, NULL, NULL);
}


BTextView::BTextView(BRect frame, const char *name, BRect textRect,
					 const BFont *initialFont, const rgb_color *initialColor,
					 uint32 resizeMask, uint32 flags)
	:	BView(frame, name, resizeMask,
				flags | B_FRAME_EVENTS | B_PULSE_NEEDED | B_INPUT_METHOD_AWARE)
{
	CALLED();
	InitObject(textRect, initialFont, initialColor);
}


/*! \brief Creates a BTextView object from the passed BMessage.
	\param archive The BMessage from which the object shall be created.
*/
BTextView::BTextView(BMessage *archive)
	:	BView(archive)
{
	CALLED();
	BRect rect;

	if (archive->FindRect("_trect", &rect) != B_OK)
		rect.Set(0, 0, 0, 0);

	InitObject(rect, NULL, NULL); 
	
	const char *text = NULL;

	if (archive->FindString("_text", &text) == B_OK)
		SetText(text);

	int32 flag, flag2;

	if (archive->FindInt32("_align", &flag) == B_OK)
		SetAlignment((alignment)flag);

	float value;

	if (archive->FindFloat("_tab", &value) == B_OK)
		SetTabWidth(value);
	
	if (archive->FindInt32("_col_sp", &flag) == B_OK)
		SetColorSpace((color_space)flag);

	if (archive->FindInt32("_max", &flag) == B_OK)
		SetMaxBytes(flag);

	if (archive->FindInt32("_sel", &flag) == B_OK &&
		archive->FindInt32("_sel", &flag2) == B_OK)
		Select(flag, flag2);
	
	bool toggle;

	if (archive->FindBool("_stylable", &toggle) == B_OK)
		SetStylable(toggle);

	if (archive->FindBool("_auto_in", &toggle) == B_OK)
		SetAutoindent(toggle);

	if (archive->FindBool("_wrap", &toggle) == B_OK)
		SetWordWrap(toggle);

	if (archive->FindBool("_nsel", &toggle) == B_OK)
		MakeSelectable(!toggle);

	if (archive->FindBool("_nedit", &toggle) == B_OK)
		MakeEditable(!toggle);

	ssize_t disallowedCount = 0;
	const int32 *disallowedChars = NULL;
	if (archive->FindData("_dis_ch", B_RAW_TYPE,
		(const void **)&disallowedChars, &disallowedCount) == B_OK) {
		
		fDisallowedChars = new BList;
		disallowedCount /= sizeof(int32);
		for (int32 x = 0; x < disallowedCount; x++)
			fDisallowedChars->AddItem(reinterpret_cast<void *>(disallowedChars[x]));
	}
	
	ssize_t runSize = 0;
	const void *flattenedRunArray = NULL;
	if (archive->FindData("_runs", B_RAW_TYPE, &flattenedRunArray, &runSize) == B_OK) {
		
		text_run_array *runArray = UnflattenRunArray(runArray, (int32 *)&runSize);
		SetRunArray(0, TextLength(), runArray);
		free(runArray);
	}
	
}


/*! \brief Frees the memory allocated and destroy the object created on construction.
*/
BTextView::~BTextView()
{
	CALLED();
	CancelInputMethod();
	DeleteOffscreen();

	delete fText;
	delete fLines;
	delete fStyles;
	delete fDisallowedChars;
	delete fUndo;
}


/*! \brief Static function used to istantiate a BTextView object from the given BMessage.
	\param archive The BMessage from which the object shall be created.
	\return A constructed BTextView as a BArchivable object.
*/
BArchivable *
BTextView::Instantiate(BMessage *archive)
{
	CALLED();
	if (validate_instantiation(archive, "BTextView"))
		return new BTextView(archive);
	else
		return NULL;
}


/*! \brief Archives the object into the passed message.
	\param data A pointer to the message where to archive the object.
	\param deep ?
	\return \c B_OK if everything went well, an error code if not.
*/
status_t 
BTextView::Archive(BMessage *data, bool deep) const
{
	CALLED();
	status_t err = BView::Archive(data, deep);
		
	data->AddString("_text", Text());
	data->AddInt32("_align", fAlignment);
	data->AddFloat("_tab", fTabWidth);
	data->AddInt32("_col_sp", fColorSpace);
	data->AddRect("_trect", fTextRect);
	data->AddInt32("_max", fMaxBytes);
	data->AddInt32("_sel", fSelStart);
	data->AddInt32("_sel", fSelEnd);	
	data->AddBool("_stylable", fStylable);
	data->AddBool("_auto_in", fAutoindent);
	data->AddBool("_wrap", fWrap);
	data->AddBool("_nsel", !fSelectable);
	data->AddBool("_nedit", !fEditable);
	
	if (fDisallowedChars != NULL)
		data->AddData("_dis_ch", B_RAW_TYPE, fDisallowedChars->Items(),
			fDisallowedChars->CountItems() * sizeof(int32));

	int32 runSize = 0;
	text_run_array *runArray = RunArray(0, TextLength());
	
	void *flattened = FlattenRunArray(runArray, &runSize);	
	if (flattened != NULL) {
		data->AddData("_runs", B_RAW_TYPE, flattened, runSize);	
		free(flattened);
	} else
		err = B_NO_MEMORY;

	free(runArray);
	
	return err;
}


/*! \brief Hook function called when the BTextView is added to the
	window's view hierarchy.
	
	Set the window's pulse rate to 2 per second and adjust scrollbars if needed
*/
void
BTextView::AttachedToWindow()
{
	CALLED();
	BView::AttachedToWindow();
	
	SetDrawingMode(B_OP_COPY);

	Window()->SetPulseRate(500000);
	
	fCaretVisible = false;
	fCaretTime = 0;
	fClickCount = 0;
	fClickTime = 0;
	fDragOffset = -1;
	fActive = false;
	
	if (fResizable)
		AutoResize(true);
	
	UpdateScrollbars();
	
	if (!fCursor)
		SetViewCursor(B_CURSOR_I_BEAM);
	else
		SetViewCursor(B_CURSOR_SYSTEM_DEFAULT);
}


/*! \brief Hook function called when the BTextView is removed from the
	window's view hierarchy.
*/
void
BTextView::DetachedFromWindow()
{
	CALLED();
	BView::DetachedFromWindow();
}


/*! \brief Hook function called whenever
	the contents of the BTextView need to be (re)drawn.
	\param updateRect The rect which needs to be redrawn
*/
void
BTextView::Draw(BRect updateRect)
{
	CALLED();
	// what lines need to be drawn?
	long startLine = LineAt(BPoint(0.0f, updateRect.top));
	long endLine = LineAt(BPoint(0.0f, updateRect.bottom));

	DrawLines(startLine, endLine);
	
	// draw the caret/hilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (fCaretVisible)
				DrawCaret(fSelStart);
		}
	}
}


/*! \brief Hook function called when a mouse button is clicked while
	the cursor is in the view.
	\param where The location where the mouse button has been clicked.
*/
void
BTextView::MouseDown(BPoint where)
{
	CALLED();
	// should we even bother?
	if (!fEditable && !fSelectable)
		return;
	
	if (!IsFocus())
		MakeFocus();
	
	// hide the caret if it's visible	
	if (fCaretVisible)
		InvertCaret();
	
	int32 mouseOffset = OffsetAt(where);	
	bool shiftDown = modifiers() & B_SHIFT_KEY;

	// TODO: Asynchronous mouse tracking

	// should we initiate a drag?
	if (fSelStart != fSelEnd && !shiftDown) {
		BPoint loc;
		ulong buttons;
		GetMouse(&loc, &buttons);
		// TODO: here we shouldn't check for B_SECONDARY_MOUSE_BUTTON,
		// since dragging works also with the primary button.
		if (buttons == B_SECONDARY_MOUSE_BUTTON) {
			// was the click within the selection range?
			if (mouseOffset >= fSelStart && mouseOffset <= fSelEnd) {
				InitiateDrag();
				return;
			}
		}
	}
	
	// get the system-wide click speed
	bigtime_t clickSpeed = 0;
	get_click_speed(&clickSpeed);
	
	// TODO: it looks like the input server sends the number of clicks in the 
	// B_MOUSE_DOWN message (the "clicks" field), so we could use it instead
	// of doing this mess.

	// is this a double/triple click, or is it a new click?
	if (clickSpeed > (system_time() - fClickTime) &&
		 mouseOffset == fClickOffset ) {
		if (fClickCount > 1) {
			// triple click
			fClickCount = 0;
			fClickTime = 0;
		} else {
			// double click
			fClickCount = 2;
			fClickTime = system_time();
		}
	} else {
		// new click
		fClickOffset = mouseOffset;
		fClickCount = 1;
		fClickTime = system_time();
	
		if (!shiftDown) {
			Select(mouseOffset, mouseOffset);
			if (fEditable)
				InvertCaret();
		}
	}
	
	// no need to track the mouse if we can't select
	if (!fSelectable)
		return;
		
	// track the mouse while it's down
	long start = 0;
	long end = 0;
	long anchor = (mouseOffset > fSelStart) ? fSelStart : fSelEnd;
	BPoint curMouse = where;
	ulong buttons = 0;
	do {
		if (mouseOffset > anchor) {
			start = anchor;
			end = mouseOffset;
		} else {
			start = mouseOffset;
			end = anchor;
		}
		
		switch (fClickCount) {
			case 0:
				// triple click, select line by line
				start = (*fLines)[LineAt(start)]->offset;
				end = (*fLines)[LineAt(end) + 1]->offset;
				break;
												
			case 2:
			{
				// double click, select word by word
				FindWord(mouseOffset, &start, &end);			
				break;
			}
				
			default:
				// new click, select char by char
				break;			
		}
		if (shiftDown) {
			if (mouseOffset > anchor)
				start = anchor;
			else
				end = anchor;
		}
		Select(start, end);
		
		// Should we scroll the view?
		if (!Bounds().Contains(curMouse)) {	
			float hDelta = 0;
			float vDelta = 0;
			if (ScrollBar(B_HORIZONTAL) != NULL) {
				if (curMouse.x < Bounds().left)
					hDelta = curMouse.x - Bounds().left;
				else {
					if (curMouse.x > Bounds().right)
						hDelta = curMouse.x - Bounds().right;
				}
				if (hDelta != 0)
					ScrollBar(B_HORIZONTAL)->SetValue(ScrollBar(B_HORIZONTAL)->Value() + hDelta);
			}
			if (ScrollBar(B_VERTICAL) != NULL) {
				if (curMouse.y < Bounds().top)
					vDelta = curMouse.y - Bounds().top;
				else if (curMouse.y > Bounds().bottom)
						vDelta = curMouse.y - Bounds().bottom;
				if (vDelta != 0)
					ScrollBar(B_VERTICAL)->SetValue(ScrollBar(B_VERTICAL)->Value() + vDelta);
			}
			if (hDelta != 0 || vDelta != 0)
				Window()->UpdateIfNeeded();
		}
		
		// Zzzz...
		snooze(30000);
		
		GetMouse(&curMouse, &buttons);
		mouseOffset = OffsetAt(curMouse);		
	} while (buttons != 0);
}


/*! \brief Hook function called when a mouse button is released while
	the cursor is in the view.
	\param where The point where the mouse button has been released.

	Doesn't do anything useful at the moment
*/
void
BTextView::MouseUp(BPoint where)
{
	CALLED();
	PerformMouseUp(where);
}


/*! \brief Hook function called whenever the mouse cursor enters, exits
	or moves inside the view.
	\param where The point where the mouse cursor has moved to.
	\param code A code which tells if the mouse entered or exited the view
	\param message The message containing dragged information, if any.
*/
void
BTextView::MouseMoved(BPoint where, uint32 code, const BMessage *message)
{
	CALLED();
	bool sync = false;
	switch (code) {
		// We force a sync when the mouse enters the view
		case B_ENTERED_VIEW:
			sync = true;
			// supposed to fall through
		case B_INSIDE_VIEW:
			TrackMouse(where, message, sync);
			break;
			
		case B_EXITED_VIEW:
			DragCaret(-1);
			if (Window()->IsActive() && message == NULL)
				SetViewCursor(B_CURSOR_SYSTEM_DEFAULT);
			break;
			
		default:
			BView::MouseMoved(where, code, message);
			break;
	}
}


/*! \brief Hook function called when the window becomes the active window
	or gives up that status.
	\param state If true, window has just become active, if false, window has
	just become inactive.
*/
void
BTextView::WindowActivated(bool state)
{
	CALLED();
	BView::WindowActivated(state);
	
	if (state && IsFocus()) {
		if (!fActive)
			Activate();
	} else {
		if (fActive)
			Deactivate();
	}
	
	BPoint where;
	ulong buttons;
	GetMouse(&where, &buttons, true);
	
	if (Bounds().Contains(where))
		TrackMouse(where, NULL); 
}


/*! \brief Hook function called whenever a key is pressed while the view is
	the focus view of the active window.
*/
void
BTextView::KeyDown(const char *bytes, int32 numBytes)
{
	CALLED();
	// TODO: Remove this and move it to specific key handlers ?
	// moreover, we should check if ARROW keys works in case the object
	// isn't editable
	if (!fEditable)
		return;
	
	const char keyPressed = bytes[0];

	// if the charachter is not allowed, bail out.
	if (fDisallowedChars
		&& fDisallowedChars->HasItem(reinterpret_cast<void *>((uint32)keyPressed))) {
		beep();
		return;
	}

	// hide the cursor and caret
	be_app->ObscureCursor();
	if (fCaretVisible)
		InvertCaret();
	
	switch (keyPressed) {
		case B_BACKSPACE:
			HandleBackspace();
			break;
			
		case B_LEFT_ARROW:
		case B_RIGHT_ARROW:
		case B_UP_ARROW:
		case B_DOWN_ARROW:
			HandleArrowKey(keyPressed);
			break;
		
		case B_DELETE:
			HandleDelete();
			break;
			
		case B_HOME:
		case B_END:
		case B_PAGE_UP:
		case B_PAGE_DOWN:
			HandlePageKey(keyPressed);
			break;
			
		case B_ESCAPE:
		case B_INSERT:
		case B_FUNCTION_KEY:
			// ignore, pass it up to superclass
			BView::KeyDown(bytes, numBytes);
			break;
			
		default:
			HandleAlphaKey(bytes, numBytes);
			break;
	}
	
	// draw the caret
	if (fSelStart == fSelEnd) {
		if (!fCaretVisible)
			InvertCaret();
	}
}


/*! \brief Hook function called every x microseconds.
	It's the function which makes the caret blink.
*/
void
BTextView::Pulse()
{
	CALLED();
	if (fActive && fEditable && fSelStart == fSelEnd) {
		// TODO: Is this check needed ?
		if (system_time() > (fCaretTime + 500000.0))
			InvertCaret();
	}
}


/*! \brief Hook function called when the view's frame is resized.
	\param width The new view's width.
	\param height The new view's height.

	Updates the associated scrollbars.
*/
void
BTextView::FrameResized(float width, float height)
{
	CALLED();
	BView::FrameResized(width, height);

	UpdateScrollbars();
}


/*! \brief Highlight/unhighlight the selection when the view gets
		or looses the focus.
	\param focusState The focus state: true, if the view is getting the focus,
		false otherwise.
*/
void
BTextView::MakeFocus(bool focusState)
{
	CALLED();
	BView::MakeFocus(focusState);
	
	if (focusState && Window()->IsActive()) {
		if (!fActive)
			Activate();
	} else {
		if (fActive)
			Deactivate();
	} 
}


/*! \brief Hook function executed every time the BTextView gets a message.
	\param message The received message
*/
void
BTextView::MessageReceived(BMessage *message)
{
	CALLED();
	// was this message dropped?
	if (message->WasDropped()) {
		BPoint dropLoc;
		BPoint offset;
		
		dropLoc = message->DropPoint(&offset);
		ConvertFromScreen(&dropLoc);
		ConvertFromScreen(&offset);
		if (!MessageDropped(message, dropLoc, offset))
			BView::MessageReceived(message);
		
		return;
	}

	switch (message->what) {
		case B_CUT:
			Cut(be_clipboard);
			break;
			
		case B_COPY:
			Copy(be_clipboard);
			break;
			
		case B_PASTE:
			Paste(be_clipboard);
			break;
		
		case B_UNDO:
			Undo(be_clipboard);
			break;
			
		case B_SELECT_ALL:
			SelectAll();
			break;
		

		case B_INPUT_METHOD_EVENT:
		{
			int32 opcode;
			if (message->FindInt32("be:opcode", &opcode) == B_OK) {
				switch (opcode) {
					case B_INPUT_METHOD_STARTED:
					{
						printf("B_INPUT_METHOD_STARTED\n");
						break;
					}	
					
					case B_INPUT_METHOD_STOPPED:
					{
						printf("B_INPUT_METHOD_STOPPED\n");
						break;
					}
					
					case B_INPUT_METHOD_CHANGED:
						printf("B_INPUT_METHOD_CHANGED\n");
						HandleInputMethodChanged(message);
						break;
		
					case B_INPUT_METHOD_LOCATION_REQUEST:
						printf("B_INPUT_METHOD_LOCATION_REQUEST\n");
						HandleInputMethodLocationRequest();
						break;
					
					default:
						break;
				}
			}
			break;
		}
		case B_SET_PROPERTY:
		case B_GET_PROPERTY:
		case B_COUNT_PROPERTIES:
		{
			BPropertyInfo propInfo(sPropertyList);
			BMessage specifier;
			const char *property;

			if (message->GetCurrentSpecifier(NULL, &specifier) != B_OK ||
				specifier.FindString("property", &property) != B_OK)
				return;

			if (propInfo.FindMatch(message, 0, &specifier, specifier.what,
				property) == B_ERROR) {
				BView::MessageReceived(message);
				break;
			}

			switch(message->what) {

				case B_GET_PROPERTY:
				{
					BMessage reply;

					GetProperty(&specifier, specifier.what, property, &reply);

					message->SendReply(&reply);

					break;
				}
				case B_SET_PROPERTY:
				{
					BMessage reply;

					SetProperty(&specifier, specifier.what, property, &reply);

					message->SendReply(&reply);

					break;
				}
				case B_COUNT_PROPERTIES:
				{
					BMessage reply;

					CountProperties(&specifier, specifier.what, property, &reply);
					
					message->SendReply(&reply);

					break;
				}
				default:
					break;
			}

			break;
		}
		default:
			BView::MessageReceived(message);
			break;
	}
}


/*! \brief Returns the proper handler for the given scripting message.
	\param message The scripting message which needs to be examined.
	\param index The index of the specifier
	\param specifier The message which contains the specifier
	\param what The 'what' field of the specifier message.
	\param property The name of the targetted property
	\return The proper BHandler for the given scripting message.
*/
BHandler *
BTextView::ResolveSpecifier(BMessage *message, int32 index,
									  BMessage *specifier, int32 what,
									  const char *property)
{
	CALLED();
	BPropertyInfo propInfo(sPropertyList);
	BHandler *target = NULL;

	if (propInfo.FindMatch(message, index, specifier, what, property) > B_ERROR)			
		target = this;

	if (!target)
		target = BView::ResolveSpecifier(message, index, specifier, what,
			property);

	return target;
}
//------------------------------------------------------------------------------
status_t
BTextView::GetSupportedSuites(BMessage *data)
{
	CALLED();
	status_t err;

	if (data == NULL)
		return B_BAD_VALUE;

	err = data->AddString("suites", "suite/vnd.Be-text-view");

	if (err != B_OK)
		return err;
	
	BPropertyInfo prop_info(sPropertyList);
	err = data->AddFlat("messages", &prop_info);

	if (err != B_OK)
		return err;
	
	return BView::GetSupportedSuites(data);
}
//------------------------------------------------------------------------------
status_t
BTextView::Perform(perform_code d, void *arg)
{
	CALLED();
	return BView::Perform(d, arg);
}
//------------------------------------------------------------------------------
void
BTextView::SetText(const char *inText, const text_run_array *inRuns)
{
	CALLED();
	// hide the caret/unhilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}
	
	// remove data from buffer
	if (fText->Length() > 0)
		DeleteText(0, fText->Length()); // TODO: was fText->Length() - 1

	int len = (inText) ? strlen(inText) : 0;
	
	if (inText != NULL && len > 0)
		InsertText(inText, len, 0, inRuns);
	
	fSelStart = fSelEnd = 0;	

	// recalc line breaks and draw the text
	Refresh(0, len, true, true);

	// draw the caret
	if (fActive) {
		if (!fCaretVisible)
			InvertCaret();
	}
}
//------------------------------------------------------------------------------
void
BTextView::SetText(const char *inText, int32 inLength,
						const text_run_array *inRuns)
{
	CALLED();
	// hide the caret/unhilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}
	
	// remove data from buffer
	if (fText->Length() > 0)
		DeleteText(0, fText->Length()); // TODO: was fText->Length() - 1
		
	if (inText != NULL && inLength > 0)
		InsertText(inText, inLength, 0, inRuns);
	
	fSelStart = fSelEnd = 0;	

	// recalc line breaks and draw the text
	Refresh(0, inLength, true, true);

	// draw the caret
	if (fActive) {
		if (!fCaretVisible)
			InvertCaret();
	}
}
//------------------------------------------------------------------------------
void
BTextView::SetText(BFile *inFile, int32 inOffset, int32 inLength,
						 const text_run_array *inRuns)
{
	CALLED();
	//	TODO: Should probably call _DoDeleteText() here
	if (fText->Length() > 0)
		DeleteText(0, fText->Length());

	fText->InsertText(inFile, inOffset, inLength, 0);
	
	// update the start offsets of each line below offset
	fLines->BumpOffset(inLength, LineAt(inOffset) + 1);
	
	// update the style runs
	fStyles->BumpOffset(inLength, fStyles->OffsetToRun(inOffset - 1) + 1);
	
	if (inRuns != NULL)
		//SetStyleRange(inOffset, inOffset + inLength, inStyles, false);
		SetRunArray(inOffset, inOffset + inLength, inRuns);
	else {
		// apply nullStyle to inserted text
		fStyles->SyncNullStyle(inOffset);
		fStyles->SetStyleRange(inOffset, inOffset + inLength, 
							  fText->Length(), doAll, NULL, NULL);
	}

	fSelStart = fSelEnd = 0;	

	// recalc line breaks and draw the text
	Refresh(0, inLength, true, true);

	// draw the caret
	if (fActive) {
		if (!fCaretVisible)
			InvertCaret();
	}
}
//------------------------------------------------------------------------------
void
BTextView::Insert(const char *inText, const text_run_array *inRuns)
{
	CALLED();
	Insert(fSelStart, inText, strlen(inText), inRuns);
}
//------------------------------------------------------------------------------
void
BTextView::Insert(const char *inText, int32 inLength,
					   const text_run_array *inRuns)
{
	CALLED();
	Insert(fSelStart, inText, inLength, inRuns);
}
//------------------------------------------------------------------------------
void
BTextView::Insert(int32 startOffset, const char *inText, int32 inLength,
					   const text_run_array *inRuns)
{
	CALLED();
	// do we really need to do anything?
	if (inLength < 1)
		return;
	
	// hide the caret/unhilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}

	if (startOffset > TextLength())
		startOffset = TextLength();

	// copy data into buffer
	InsertText(inText, inLength, startOffset, inRuns);
	
	// offset the caret/selection
	long saveStart = fSelStart;
	fSelStart += inLength;
	fSelEnd += inLength;

	// recalc line breaks and draw the text
	Refresh(saveStart, startOffset, true, true);

	// draw the caret/hilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (!fCaretVisible)
				InvertCaret();
		}
	}
}


/*! \brief Deletes the selected text.
*/
void
BTextView::Delete()
{
	CALLED();
	// anything to delete?
	if (fSelStart == fSelEnd)
		return;
		
	// hide the caret/unhilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}
	
	// remove data from buffer
	DeleteText(fSelStart, fSelEnd);
	
	// collapse the selection
	fSelEnd = fSelStart;
	
	// recalc line breaks and draw what's left
	Refresh(fSelStart, fSelEnd, true, true);
	
	// draw the caret
	if (fActive) {
		if (!fCaretVisible)
			InvertCaret();
	}
}


/*! \brief Delets the text comprised within the given offsets.
	\param startOffset The offset of the text to delete.
	\param endOffset The offset where the text to delete ends.
*/
void
BTextView::Delete(int32 startOffset, int32 endOffset)
{
	CALLED();
	// anything to delete?
	if (startOffset == endOffset)
		return;
		
	// hide the caret/unhilite the selection
	if (fActive) {
		if (startOffset != endOffset)
			Highlight(startOffset, endOffset);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}
	
	// remove data from buffer
	DeleteText(startOffset, endOffset);
	
	// recalc line breaks and draw what's left
	Refresh(startOffset, endOffset, true, true);
	
	// draw the caret
	if (fActive) {
		if (!fCaretVisible)
			InvertCaret();
	}
}


/*! \brief Returns the BTextView text as a C string.
	\return A pointer to the text.
	
	It is possible that the BTextView object had to do some operations
	on the text, to be able to return it as a C string.
	If you need to call Text() repeatedly, you'd better use GetText().
*/
const char *
BTextView::Text() const
{
	CALLED();
	return fText->Text();
}


/*! \brief Returns the length of the BTextView's text.
	\return The length of the text.
*/
int32
BTextView::TextLength() const
{
	CALLED();
	return fText->Length();
}


void
BTextView::GetText(int32 offset, int32 length, char *buffer) const
{
	CALLED();
	if (buffer == NULL)
		return;

	fText->GetString(offset, length, buffer);
}


/*! \brief Returns the charachter at the given offset.
	\param offset The offset of the wanted charachter.
	\return The charachter at the given offset.
*/
uchar
BTextView::ByteAt(int32 offset) const
{
	CALLED();
	if (offset < 0 || offset > (fText->Length() - 1))
		return '\0';
		
	return (*fText)[offset];
}
//------------------------------------------------------------------------------
int32
BTextView::CountLines() const
{
	CALLED();
	return fLines->NumLines();
}


/*! \brief Returns the index of the current line.
	\return The index of the current line.
*/
int32
BTextView::CurrentLine() const
{
	CALLED();
	return LineAt(fSelStart);
}


void
BTextView::GoToLine(int32 index)
{
	CALLED();
	fSelStart = fSelEnd = OffsetAt(index);
}


/*! \brief Cuts the current selection to the clipboard.
	\param clipboard The clipboard where to copy the cutted text.
*/
void
BTextView::Cut(BClipboard *clipboard)
{
	CALLED();
	if (fUndo) {
		delete fUndo;
		fUndo = new _BCutUndoBuffer_(this);
	}
	Copy(clipboard);
	Delete();
}


/*! \brief Copies the current selection to the clipboard.
	\param clipboard The clipboard where to copy the selected text.
*/
void
BTextView::Copy(BClipboard *clipboard)
{
	CALLED();
	BMessage *clip = NULL;

	if (clipboard->Lock()) {
		clipboard->Clear(); 
   
		if ((clip = clipboard->Data()) != NULL) {
			clip->AddData("text/plain", B_MIME_TYPE, Text() + fSelStart,
				fSelEnd - fSelStart);
			
			int32 size;
			if (fStylable) {
				text_run_array *runArray = RunArray(fSelStart, fSelEnd, &size);
				clip->AddData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
					runArray, size);
				free(runArray);
			}
			clipboard->Commit();
		}
		clipboard->Unlock(); 
	}	
}


/*! \brief Paste the text contained in the clipboard to the BTextView.
	\param clipboard A pointer to the clipboard.
*/
void
BTextView::Paste(BClipboard *clipboard)
{
	CALLED();
	BMessage *clip = NULL;

	if (clipboard->Lock()) { 
		clip = clipboard->Data();
		if (clip != NULL) {
			const char *text = NULL;
			ssize_t len = 0;
					
			if (clip->FindData("text/plain", B_MIME_TYPE,
					(const void **)&text, &len) == B_OK) {
				text_run_array *runArray = NULL;
				ssize_t runLen = 0;
				
				if (fStylable)
					clip->FindData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
						(const void **)&runArray, &runLen);

				if (fUndo) {
					delete fUndo;
					fUndo = new _BPasteUndoBuffer_(this, text, len, runArray, runLen);
				}

				if (fSelStart != fSelEnd)
					Delete();
					
				Insert(text, len, runArray);
			}		
		}

		clipboard->Unlock();
	}
}


void
BTextView::Clear()
{
	CALLED();
	Delete();
}


bool
BTextView::AcceptsPaste(BClipboard *clipboard)
{
	CALLED();
	if (!fEditable)
		return false;
		
	bool result = false;
	
	if (clipboard->Lock()) {
		BMessage *data = clipboard->Data();
		result = data && data->HasData("text/plain", B_MIME_TYPE);
		clipboard->Unlock();
	}

	return result;
}


bool
BTextView::AcceptsDrop(const BMessage *inMessage)
{
	CALLED();
	if (fEditable && inMessage && inMessage->HasData("text/plain", B_MIME_TYPE))
		return true;
			
	return false;
}


/*! \brief Selects the text within the given offsets.
	\param startOffset The offset of the text to select.
	\param endOffset The offset where the text ends.
*/
void
BTextView::Select(int32 startOffset, int32 endOffset)
{
	CALLED();
	if (!fSelectable)
		return;
		
	// a negative selection?
	if (startOffset > endOffset)
		return;
		
	// is the new selection any different from the current selection?
	if (startOffset == fSelStart && endOffset == fSelEnd)
		return;
	
	fStyles->InvalidateNullStyle();
	
	// pin offsets at reasonable values
	startOffset = (startOffset < 0) ? 0 : startOffset;
	endOffset = (endOffset < 0) ? 0 : endOffset;
	endOffset = (endOffset > fText->Length()) ? fText->Length() : endOffset;

	// hide the caret
	if (fCaretVisible)
		InvertCaret();
	
	if (startOffset == endOffset) {
		if (fSelStart != fSelEnd) {
			// unhilite the selection
			if (fActive)
				Highlight(fSelStart, fSelEnd); 
		}
		fSelStart = fSelEnd = startOffset;
	} else {
		if (fActive) {
			// draw only those ranges that are different
			long start, end;
			if (startOffset != fSelStart) {
				// start of selection has changed
				if (startOffset > fSelStart) {
					start = fSelStart;
					end = startOffset;
				} else {
					start = startOffset;
					end = fSelStart;
				}
				Highlight(start, end);
			}
			
			if (endOffset != fSelEnd) {
				// end of selection has changed
				if (endOffset > fSelEnd) {
					start = fSelEnd;
					end = endOffset;
				} else {
					start = endOffset;
					end = fSelEnd;
				}
				Highlight(start, end);
			}
		}
		fSelStart = startOffset;
		fSelEnd = endOffset;
	}
}


/*! \brief Selects all the text in the BTextView.
*/
void
BTextView::SelectAll()
{
	CALLED();
	Select(0, fText->Length());
}


/*! \brief Gets the current selection.
	\param outStart A pointer to an int32 which will contain the selection start's offset.
	\param outEnd A pointer to an int32 which will contain the selection end's offset.
*/
void
BTextView::GetSelection(int32 *outStart, int32 *outEnd) const
{
	CALLED();
	if (fSelectable) {
		*outStart = fSelStart;
		*outEnd = fSelEnd;
	} else {
		*outStart = 0;
		*outEnd = 0;
	}
}


void
BTextView::SetFontAndColor(const BFont *inFont, uint32 inMode,
								const rgb_color *inColor)
{
	CALLED();
	// hide the caret/unhilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}
	
	BFont newFont = *inFont;
	NormalizeFont(&newFont);
	
	// add the style to the style buffer
	fStyles->SetStyleRange(fSelStart, fSelEnd, fText->Length(),
						  inMode, &newFont, inColor);
						
	if (inMode & doFont || inMode & doSize)
		// recalc the line breaks and redraw with new style
		Refresh(fSelStart, fSelEnd, fSelStart != fSelEnd, false);
	else
		// the line breaks wont change, simply redraw
		DrawLines(LineAt(fSelStart), LineAt(fSelEnd), fSelStart, true);
	
	// draw the caret/hilite the selection
	if (fActive) {
		if (fSelStart != fSelEnd)
			Highlight(fSelStart, fSelEnd);
		else {
			if (!fCaretVisible)
				InvertCaret();
		}
	}
}


void
BTextView::SetFontAndColor(int32 startOffset, int32 endOffset,
								const BFont *inFont, uint32 inMode,
								const rgb_color	*inColor)
{
	CALLED();
	// hide the caret/unhilite the selection
	if (fActive) {
		if (startOffset != endOffset)
			Highlight(startOffset, endOffset);
		else {
			if (fCaretVisible)
				InvertCaret();
		}
	}
	
	BFont newFont = *inFont;
	NormalizeFont(&newFont);
	
	// add the style to the style buffer
	fStyles->SetStyleRange(startOffset, endOffset, fText->Length(),
						  inMode, &newFont, inColor);
						
	if (inMode & doFont || inMode & doSize)
		// recalc the line breaks and redraw with new style
		Refresh(startOffset, endOffset, startOffset != endOffset, false);
	else
		// the line breaks wont change, simply redraw
		DrawLines(LineAt(startOffset), LineAt(endOffset), startOffset, true);
	
	// draw the caret/hilite the selection
	if (fActive) {
		if (startOffset != endOffset)
			Highlight(startOffset, endOffset);
		else {
			if (!fCaretVisible)
				InvertCaret();
		}
	}
}


void
BTextView::GetFontAndColor(int32 inOffset, BFont *outFont,
								rgb_color *outColor) const
{
	CALLED();
	fStyles->GetStyle(inOffset, outFont, outColor);
}


void
BTextView::GetFontAndColor(BFont *outFont, uint32 *outMode,
								rgb_color *outColor, bool *outEqColor) const
{
	CALLED();
	// TODO fill in outMode and outEqColor
	fStyles->GetStyle(fSelStart, outFont, outColor);
	
	// TODO: This is a hack to make beshare work. 
	// We should use _BStyleBuffer_::ContinuousGetStyle() here.
	*outMode = doSize;
}


void
BTextView::SetRunArray(int32 startOffset, int32 endOffset,
							const text_run_array *inRuns)
{
	CALLED();
	// pin offsets at reasonable values
	startOffset = (startOffset < 0) ? 0 : startOffset;
	endOffset = (endOffset < 0) ? 0 : endOffset;
	endOffset = (endOffset > fText->Length()) ? fText->Length() : endOffset;
	
	long numStyles = inRuns->count;
	if (numStyles > 0) {	
		int32 textLength = fText->Length();
		const text_run *theRun = &inRuns->runs[0];
		for (long index = 0; index < numStyles; index++) {
			long fromOffset = theRun->offset + startOffset;
			long toOffset = endOffset;
			if ((index + 1) < numStyles) {
				toOffset = (theRun + 1)->offset + startOffset;
				toOffset = (toOffset > endOffset) ? endOffset : toOffset;
			}

			fStyles->SetStyleRange(fromOffset, toOffset, textLength,
							  	  doAll, &theRun->font, &theRun->color);
							
			theRun++;
		}
		fStyles->InvalidateNullStyle();
		
		Refresh(startOffset, endOffset, true, false);
	}
}


/*! \brief Returns a RunArray for the text within the given offsets.
	\param startOffset The offset where to start.
	\param endOffset The offset where the wanted text ends.
	\param outSize A pointer to an int32 which will contain the size
		of the run array.
	\return A text_run_array for the text in the given offsets.

	The returned text_run_array belongs to the caller, so you better
	free it as soon as you don't need it.
*/
text_run_array *
BTextView::RunArray(int32 startOffset, int32 endOffset,
									int32 *outSize) const
{
	CALLED();
	STEStyleRangePtr styleRange = fStyles->GetStyleRange(startOffset, endOffset - 1);

	if (styleRange == NULL)
		return NULL;

	text_run_array *res = (text_run_array *)malloc(sizeof(int32) +
		(sizeof(text_run) * styleRange->count));

	res->count = styleRange->count;

	for (int32 i = 0; i < res->count; i++) {
		res->runs[i].offset = styleRange->runs[i].offset;
		res->runs[i].font = &styleRange->runs[i].style.font;
		res->runs[i].color = styleRange->runs[i].style.color;
	}

	if (outSize != NULL)
		*outSize = sizeof(int32) + (sizeof(text_run) * res->count);

	return res;
}


/*! \brief Returns the line number for the charachter at the given offset.
	\param offset The offset of the wanted charachter.
	\return A line number.
*/
int32
BTextView::LineAt(int32 offset) const
{
	CALLED();
	return fLines->OffsetToLine(offset);
}


/*! \brief Returns the line number for the given point.
	\param point A point.
	\return A line number.
*/
int32
BTextView::LineAt(BPoint point) const
{
	CALLED();
	return fLines->PixelToLine(point.y - fTextRect.top);
}
//------------------------------------------------------------------------------
BPoint
BTextView::PointAt(int32 inOffset, float *outHeight) const
{
	CALLED();
	BPoint result;
	int32 textLength = fText->Length();
	int32 lineNum = LineAt(inOffset);
	STELinePtr line = (*fLines)[lineNum];
	float height = (line + 1)->origin - line->origin;
	
	result.x = 0.0;
	result.y = line->origin + fTextRect.top;
	
	// special case: go down one line if inOffset is a newline
	if (inOffset == textLength && (*fText)[textLength - 1] == '\n') {
		float ascent, descent;
		StyledWidth(inOffset, 1, &ascent, &descent);
		
		result.y += height;
		height = ascent + descent;

	} else {
		int32 offset = line->offset;
		int32 length = inOffset - line->offset;
		int32 numChars = length;
		bool foundTab = false;		
		do {
			foundTab = fText->FindChar(B_TAB, offset, &numChars);
		
			result.x += StyledWidth(offset, numChars);
	
			if (foundTab) {
				result.x += ActualTabWidth(result.x);
				numChars++;
			}
			
			offset += numChars;
			length -= numChars;
			numChars = length;
		} while (foundTab && length > 0);
	} 		

	// convert from text rect coordinates
	result.x += fTextRect.left - 1.0;

	// round up
	result.x = ceil(result.x);
	result.y = ceil(result.y);
	if (outHeight != NULL)
		*outHeight = height;
		
	return result;
}
//------------------------------------------------------------------------------
int32
BTextView::OffsetAt(BPoint point) const
{
	CALLED();
	// should we even bother?
	if (point.y >= fTextRect.bottom)
		return fText->Length();
	else if (point.y < fTextRect.top)
		return 0;

	int32 lineNum = LineAt(point);
	STELinePtr line = (*fLines)[lineNum];
	
	// special case: if point is within the text rect and PixelToLine()
	// tells us that it's on the last line, but if point is actually  
	// lower than the bottom of the last line, return the last offset 
	// (can happen for newlines)
	if (lineNum == (fLines->NumLines() - 1)) {
		if (point.y >= ((line + 1)->origin + fTextRect.top))
			return (fText->Length());
	}
	
	// convert to text rect coordinates
	point.x -= fTextRect.left;
	point.x = (point.x < 0.0) ? 0.0 : point.x;
	
	// do a pseudo-binary search of the character widths on the line
	// that PixelToLine() gave us
	// note: the right half of a character returns its offset + 1
	int32 offset = line->offset;
	int32 saveOffset = offset;
	int32 delta = 0;
	int32 limit = (line + 1)->offset;
	int32 length = limit - line->offset;
	float sigmaWidth = 0.0;
	float tabWidth = 0.0;
	int32 numChars = length;
	bool done = false;
	bool foundTab = false;
	do {
		saveOffset = offset;
		
		if (foundTab) {
			// is the point in the right-half of the tab?
			if (point.x >= (sigmaWidth - (tabWidth / 2)) &&
				point.x < sigmaWidth)
				break;
		}
		
		// any more tabs?
		foundTab = fText->FindChar(B_TAB, offset, &numChars);
		
		delta = numChars / 2;
		delta = (delta < 1) ? 1 : delta;
		
		if (numChars > 1) {
			do {
				float deltaWidth = StyledWidth(offset, delta);
				float leftWidth = StyledWidth(offset + delta - 1, 1);
				sigmaWidth += deltaWidth;
	
				if (point.x >= (sigmaWidth - (leftWidth / 2))) {
					// we're to the left of the point
					float rightWidth = StyledWidth(offset + delta, 1);
					if (point.x < (sigmaWidth + (rightWidth / 2))) {
						// the next character is to the right, we're done!
						offset += delta;
						done = true;
						break;
					} else {
						// still too far to the left, measure some more
						offset += delta;
						delta /= 2;
						delta = (delta < 1) ? 1 : delta;
					}
				} else {
					// oops, we overshot the point, go back some 
					sigmaWidth -= deltaWidth;
					
					if (delta == 1) {
						done = true;
						break;
					}
						
					delta /= 2;
					delta = (delta < 1) ? 1 : delta;
	
				}
			} while (offset < (numChars + saveOffset));
		}
		
		if (done || offset >= limit)
			break;
			
		if (foundTab) {
			tabWidth = ActualTabWidth(sigmaWidth);
			
			// is the point in the left-half of the tab?
			if (point.x < (sigmaWidth + (tabWidth / 2)))
				break;
				
			sigmaWidth += tabWidth;
			numChars++;
		}

		offset = saveOffset + numChars;
		length -= numChars;
		numChars = length;
	} while (foundTab && length > 0);
	
	if (offset == (line + 1)->offset) {
		// special case: newlines aren't visible
		// return the offset of the character preceding the newline
		if ((*fText)[offset - 1] == '\n')
			return --offset;

		// special case: return the offset preceding any spaces that 
		// aren't at the end of the buffer
		if (offset != fText->Length() && (*fText)[offset - 1] == B_SPACE)
			return --offset;
	}
	
	return offset;
}
//------------------------------------------------------------------------------
int32
BTextView::OffsetAt(int32 line) const
{
	if (line > fLines->NumLines())
		return fText->Length();

	return (*fLines)[line]->offset;
}
//------------------------------------------------------------------------------
void 
BTextView::FindWord(int32 inOffset, int32 *outFromOffset,
						 int32 *outToOffset)
{
	int32 offset;

	// check to the left
	for (offset = inOffset; offset > 0; offset--) {
		if (CharClassification(offset - 1) == B_SEPARATOR_CHARACTER)
			break;
	}

	*outFromOffset = offset;

	// check to the right
	int32 textLen = TextLength();
	for (offset = inOffset; offset < textLen; offset++) {
		if (CharClassification(offset) == B_SEPARATOR_CHARACTER)
			break;
	}
	
	*outToOffset = offset;
}


bool
BTextView::CanEndLine(int32 offset)
{
	CALLED();
	return (CharClassification(offset) == B_SEPARATOR_CHARACTER);
}


float
BTextView::LineWidth(int32 lineNum) const
{
	CALLED();
	if (lineNum < 0)
		return (*fLines)[0]->width;
	else if (lineNum > fLines->NumLines() - 1)
		return (*fLines)[fLines->NumLines() - 1]->width;
	else
		return (*fLines)[lineNum]->width;
}


float
BTextView::LineHeight(int32 lineNum) const
{
	CALLED();
	if (lineNum < 0)
		return (*fLines)[0]->ascent;
	else if (lineNum > fLines->NumLines() - 1)
		return (*fLines)[fLines->NumLines() - 1]->ascent;
	else
		return (*fLines)[lineNum]->ascent;
}


float
BTextView::TextHeight(int32 startLine, int32 endLine) const
{
	CALLED();
	int32 numLines = fLines->NumLines();
	startLine = (startLine < 0) ? 0 : startLine;
	endLine = (endLine > numLines - 1) ? numLines - 1 : endLine;
	
	float height = (*fLines)[endLine + 1]->origin - 
				   (*fLines)[startLine]->origin;
				
	if (endLine == numLines - 1 && (*fText)[fText->Length() - 1] == '\n')
		height += (*fLines)[endLine + 1]->origin - (*fLines)[endLine]->origin;
	
	return height;
}


void
BTextView::GetTextRegion(int32 startOffset, int32 endOffset,
							  BRegion *outRegion) const
{
	CALLED();
	outRegion->MakeEmpty();

	// return an empty region if the range is invalid
	if (startOffset >= endOffset)
		return;

	float startLineHeight = 0.0;
	float endLineHeight = 0.0;
	BPoint startPt = PointAt(startOffset, &startLineHeight);
	BPoint endPt = PointAt(endOffset, &endLineHeight);
	
	BRect selRect;

	if (startPt.y == endPt.y) {
		// this is a one-line region
		selRect.left = max_c(startPt.x, fTextRect.left);
		selRect.top = startPt.y;
		selRect.right = endPt.x - 1.0;
		selRect.bottom = endPt.y + endLineHeight - 1.0;
		outRegion->Include(selRect);

	} else {
		// more than one line in the specified offset range
		selRect.left = max_c(startPt.x, fTextRect.left);
		selRect.top = startPt.y;
		selRect.right = fTextRect.right;
		selRect.bottom = startPt.y + startLineHeight - 1.0;
		outRegion->Include(selRect);
		
		if (startPt.y + startLineHeight < endPt.y) {
			// more than two lines in the range
			selRect.left = fTextRect.left;
			selRect.top = startPt.y + startLineHeight + 1.0;
			selRect.right = fTextRect.right;
			selRect.bottom = endPt.y - 1.0;
			outRegion->Include(selRect);
		}
		
		selRect.left = fTextRect.left;
		selRect.top = endPt.y;
		selRect.right = endPt.x - 1.0;
		selRect.bottom = endPt.y + endLineHeight - 1.0;
		outRegion->Include(selRect);
	}
}
//------------------------------------------------------------------------------
void
BTextView::ScrollToOffset(int32 inOffset)
{
	CALLED();
	BRect bounds = Bounds();
	//STELinePtr	line = (*fLines)[LineAt(inOffset)];
	float lineHeight = 0.0;
	BPoint point = PointAt(inOffset, &lineHeight);
	
	if (ScrollBar(B_HORIZONTAL) != NULL) {
		if (point.x < bounds.left || point.x >= bounds.right)
			ScrollBar(B_HORIZONTAL)->SetValue(point.x - (bounds.IntegerWidth() / 2));
	}
	
	if (ScrollBar(B_VERTICAL) != NULL) {
		if (point.y < bounds.top || (point.y + lineHeight) >= bounds.bottom)
			ScrollBar(B_VERTICAL)->SetValue(point.y - (bounds.IntegerHeight() / 2));
	}
}
//------------------------------------------------------------------------------
void
BTextView::ScrollToSelection()
{
	CALLED();
	ScrollToOffset(fSelStart);
}


/*! \brief Highlight the text comprised between the given offset.
	\param startOffset The offset of the text to highlight.
	\param endOffset The offset where the text to highlight ends.
*/
void
BTextView::Highlight(int32 startOffset, int32 endOffset)
{
	CALLED();
	// get real
	if (startOffset >= endOffset)
		return;
		
	BRegion selRegion;
	GetTextRegion(startOffset, endOffset, &selRegion);
	
	SetDrawingMode(B_OP_INVERT);	
	FillRegion(&selRegion, B_SOLID_HIGH);
	SetDrawingMode(B_OP_COPY);
}
//------------------------------------------------------------------------------
void
BTextView::SetTextRect(BRect rect)
{
	CALLED();
	if (rect == fTextRect)
		return;
		
	fTextRect = rect;
	
	if (Window() != NULL)
		Refresh(0, fLines->NumLines(), true, false);
}
//------------------------------------------------------------------------------
BRect
BTextView::TextRect() const
{
	CALLED();
	return fTextRect;
}
//------------------------------------------------------------------------------
void
BTextView::SetStylable(bool stylable)
{
	CALLED();
	fStylable = stylable;
}


/*! \brief Tells if the object is stylable.
	\return true if the object is stylable, false otherwise.
	If the object is stylable, it can show multiple fonts at the same time.
*/
bool
BTextView::IsStylable() const
{
	CALLED();
	return fStylable;
}
//------------------------------------------------------------------------------
void
BTextView::SetTabWidth(float width)
{
	CALLED();
	if (width == fTabWidth)
		return;
		
	fTabWidth = width;
	
	if (Window() != NULL)
		Refresh(0, fLines->NumLines(), true, false);
}


/*! \brief Returns the BTextView's tab width.
	\return The BTextView's tab width.
*/
float
BTextView::TabWidth() const
{
	CALLED();
	return fTabWidth;
}


/*! \brief Makes the object selectable, or not selectable.
	\param selectable If true, the object will be selectable from now on.
	 if false, it won't be selectable anymore.
*/
void
BTextView::MakeSelectable(bool selectable)
{
	CALLED();
	if (selectable == fSelectable)
		return;
		
	fSelectable = selectable;
	
	if (Window() != NULL) {
		if (fActive) {
			// show/hide the caret, hilite/unhilite the selection
			if (fSelStart != fSelEnd)
				Highlight(fSelStart, fSelEnd);
			else
				InvertCaret();
		}
	}
}


/*! \brief Tells if the object is selectable
	\return \c true if the object is selectable,
			\c false if not.
*/
bool
BTextView::IsSelectable() const
{
	CALLED();
	return fSelectable;
}


/*! \brief Set (or remove) the editable property for the object.
	\param editable If true, will make the object editable,
		if false, will make it not editable.
*/
void
BTextView::MakeEditable(bool editable)
{
	CALLED();
	if (editable == fEditable)
		return;
		
	fEditable = editable;
	
	if (Window() != NULL) {
		if (fActive) {
			if (!fEditable && fCaretVisible)
				InvertCaret();
		}
	}
}


/*! \brief Tells if the object is editable.
	\return \c true if the object is editable,
			\c false if not.
*/
bool
BTextView::IsEditable() const
{
	CALLED();
	return fEditable;
}


/*! \brief Set (or unset) word wrapping mode.
	\param wrap Specifies if you want word wrapping active or not.
*/
void
BTextView::SetWordWrap(bool wrap)
{
	CALLED();
	if (wrap == fWrap)
		return;
		
	fWrap = wrap;
	
	if (Window() != NULL) {
		if (fActive) {
			// hide the caret, unhilite the selection
			if (fSelStart != fSelEnd)
				Highlight(fSelStart, fSelEnd);
			else {
				if (fCaretVisible)
					InvertCaret();
			}
		}
		
		Refresh(0, fLines->NumLines(), true, false);
		
		if (fActive) {
			// show the caret, hilite the selection
			if (fSelStart != fSelEnd && fSelectable)
				Highlight(fSelStart, fSelEnd);
			else {
				if (!fCaretVisible)
					InvertCaret();
			}
		}
	}
}


/*! \brief Tells if word wrapping is activated.
	\return true if word wrapping is active, false otherwise.
*/
bool
BTextView::DoesWordWrap() const
{
	CALLED();
	return fWrap;
}
//------------------------------------------------------------------------------
void
BTextView::SetMaxBytes(int32 max)
{
	CALLED();
	fMaxBytes = max;
}
//------------------------------------------------------------------------------
int32
BTextView::MaxBytes() const
{
	CALLED();
	return fMaxBytes;
}


/*! \brief Adds the given char to the disallowed chars list.
	\param aChar The charachter to add to the list.

	After this function returns, the given charachter won't be accepted
	by the textview anymore.
*/
void
BTextView::DisallowChar(uint32 aChar)
{
	CALLED();
	if (fDisallowedChars == NULL)
		fDisallowedChars = new BList;
	if (!fDisallowedChars->HasItem(reinterpret_cast<void *>(aChar)))
		fDisallowedChars->AddItem(reinterpret_cast<void *>(aChar));
}


/*! \brief Removes the given charachter from the disallowed list.
	\param aChar The charachter to remove from the list.
*/
void
BTextView::AllowChar(uint32 aChar)
{
	CALLED();
	if (fDisallowedChars != NULL)
		fDisallowedChars->RemoveItem(reinterpret_cast<void *>(aChar));
}
//------------------------------------------------------------------------------
void
BTextView::SetAlignment(alignment flag)
{
	CALLED();
	
	// Do a reality check
	if (fAlignment != flag && flag >= 0 && flag <= 2) {
		fAlignment = flag;
		
		// After setting new alignment, update the view/window
		BWindow *window = Window();
		if (window) {
			Invalidate();
			window->UpdateIfNeeded();
		}
	}
}
//------------------------------------------------------------------------------
alignment
BTextView::Alignment() const
{
	CALLED();
	return fAlignment;
}
//------------------------------------------------------------------------------
void
BTextView::SetAutoindent(bool state)
{
	CALLED();
	fAutoindent = state;
}
//------------------------------------------------------------------------------
bool
BTextView::DoesAutoindent() const
{
	CALLED();
	return fAutoindent;
}


/*! \brief Set the color space for the offscreen BBitmap.
	\param colors The new colorspace for the offscreen BBitmap.
*/
void
BTextView::SetColorSpace(color_space colors)
{
	CALLED();
	if (colors != fColorSpace && fOffscreen) {
		fColorSpace = colors;
		DeleteOffscreen();
		NewOffscreen();
	}
}


/*! \brief Returns the colorspace of the offscreen BBitmap, if any.
	\return The colorspace of the BTextView's offscreen BBitmap.
*/
color_space
BTextView::ColorSpace() const
{
	CALLED();
	return fColorSpace;
}
//------------------------------------------------------------------------------
void
BTextView::MakeResizable(bool resize, BView *resizeView)
{
	CALLED();
	if (resize) {
		fResizable = true;
		fContainerView = resizeView;
		
		// Wrapping mode and resizable mode can't live together
		if (fWrap) {
			fWrap = false;
			
			if (fActive && Window() != NULL) {	
				if (fSelStart != fSelEnd && fSelectable)
					Highlight(fSelStart, fSelEnd);

				else if (fCaretVisible) {
					InvertCaret();
					Refresh(0, fLines->NumLines(), true, false);
				}		
			}	
		}
	} else {
		fResizable = false;
		fContainerView = NULL;
		if (fOffscreen)
			DeleteOffscreen();
		NewOffscreen();
	}
}
//------------------------------------------------------------------------------
bool
BTextView::IsResizable() const
{
	CALLED();
	return fResizable;
}
//------------------------------------------------------------------------------
void
BTextView::SetDoesUndo(bool undo)
{
	CALLED();
	if (undo && fUndo == NULL)
		fUndo = new _BUndoBuffer_(this, B_UNDO_UNAVAILABLE);
	else if (!undo && fUndo != NULL) {
		delete fUndo;
		fUndo = NULL;
	}
}
//------------------------------------------------------------------------------
bool
BTextView::DoesUndo() const
{
	CALLED();
	return fUndo != NULL;
}
//------------------------------------------------------------------------------
void
BTextView::HideTyping(bool enabled)
{
	CALLED();
	//TODO: Implement ?
	//fText->SetPasswordMode(enabled);
}
//------------------------------------------------------------------------------
bool
BTextView::IsTypingHidden() const
{
	CALLED();
	return fText->PasswordMode();
}
//------------------------------------------------------------------------------
void
BTextView::ResizeToPreferred()
{
	CALLED();
	float widht, height;
	GetPreferredSize(&widht, &height);
	BView::ResizeTo(widht, height);
}
//------------------------------------------------------------------------------
void
BTextView::GetPreferredSize(float *width, float *height)
{
	CALLED();
	BView::GetPreferredSize(width, height);
}
//------------------------------------------------------------------------------
void
BTextView::AllAttached()
{
	CALLED();
	BView::AllAttached();
}
//------------------------------------------------------------------------------
void
BTextView::AllDetached()
{
	CALLED();
	BView::AllDetached();
}
//------------------------------------------------------------------------------
void *
BTextView::FlattenRunArray(const text_run_array *inArray, int32 *outSize)
{
	CALLED();
	int32 size = sizeof(flattened_text_run_array) + (inArray->count - 1) *
		sizeof(flattened_text_run_array);

	flattened_text_run_array *array = (flattened_text_run_array *)malloc(size);
	if (array == NULL) {
		*outSize = 0;
		return NULL;
	}

	array->magic[0] = 0x41;
	array->magic[1] = 0x6c;
	array->magic[2] = 0x69;
	array->magic[3] = 0x21;
	array->version[0] = 0x00;
	array->version[1] = 0x00;
	array->version[2] = 0x00;
	array->version[3] = 0x00;
	array->count = inArray->count;

	for (int32 i = 0; i < inArray->count; i++) {
		array->styles[i].offset = inArray->runs[i].offset;
		inArray->runs[i].font.GetFamilyAndStyle(&array->styles[i].family,
			&array->styles[i].style);
		array->styles[i].size = inArray->runs[i].font.Size();
		array->styles[i].shear = inArray->runs[i].font.Shear();
		array->styles[i].face = inArray->runs[i].font.Face();
		array->styles[i].red = inArray->runs[i].color.red;
		array->styles[i].green = inArray->runs[i].color.green;
		array->styles[i].blue = inArray->runs[i].color.blue;
		array->styles[i].alpha = 255;
		array->styles[i]._reserved_ = 0;
	}

	if (outSize)
		*outSize = size;

	return array;
}
//------------------------------------------------------------------------------
text_run_array *
BTextView::UnflattenRunArray(const void	*data, int32 *outSize)
{
	CALLED();
	flattened_text_run_array *array = (flattened_text_run_array *)data;

	if (array->magic[0] != 0x41 || array->magic[1] != 0x6c ||
		array->magic[2] != 0x69 || array->magic[3] != 0x21 ||
		array->version[0] != 0x00 || array->version[1] != 0x00 ||
		array->version[2] != 0x00 || array->version[3] != 0x00) {
		
		if (outSize)
			*outSize = 0;

		return NULL;
	}

	int32 size = sizeof(text_run_array) + (array->count - 1) * sizeof(text_run);

	text_run_array *run_array = (text_run_array *)malloc(size);
	if (run_array == NULL) {
		*outSize = 0;
		return NULL;
	}

	run_array->count = array->count;

	for (int32 i = 0; i < array->count; i++) {
		run_array->runs[i].font = new BFont;
		run_array->runs[i].font.SetFamilyAndStyle(array->styles[i].family,
			array->styles[i].style);
		run_array->runs[i].font.SetSize(array->styles[i].size);
		run_array->runs[i].font.SetShear(array->styles[i].shear);
		run_array->runs[i].font.SetFace(array->styles[i].face);
		run_array->runs[i].color.red = array->styles[i].red;
		run_array->runs[i].color.green = array->styles[i].green;
		run_array->runs[i].color.blue = array->styles[i].blue;
		run_array->runs[i].color.alpha = array->styles[i].alpha;
	}

	if (outSize)
		*outSize = size;

	return run_array;
}
//------------------------------------------------------------------------------
void
BTextView::InsertText(const char *inText, int32 inLength, int32 inOffset,
						   const text_run_array *inRuns)
{
	CALLED();
	// why add nothing?
	if (inLength < 1)
		return;
	
	// add the text to the buffer
	fText->InsertText(inText, inLength, inOffset);
	
	// update the start offsets of each line below offset
	fLines->BumpOffset(inLength, LineAt(inOffset) + 1);
	
	// update the style runs
	fStyles->BumpOffset(inLength, fStyles->OffsetToRun(inOffset - 1) + 1);
	
	if (inRuns != NULL)
		//SetStyleRange(inOffset, inOffset + inLength, inStyles, false);
		SetRunArray(inOffset, inOffset + inLength, inRuns);
	else {
		// apply nullStyle to inserted text
		fStyles->SyncNullStyle(inOffset);
		fStyles->SetStyleRange(inOffset, inOffset + inLength, 
							  fText->Length(), doAll, NULL, NULL);
	}
}
//------------------------------------------------------------------------------
void
BTextView::DeleteText(int32 fromOffset, int32 toOffset)
{
	CALLED();
	// sanity checking
	if (fromOffset >= toOffset || fromOffset < 0 || toOffset < 0)
		return;
		
	// set nullStyle to style at beginning of range
	fStyles->InvalidateNullStyle();
	fStyles->SyncNullStyle(fromOffset);	
	
	// remove from the text buffer
	fText->RemoveRange(fromOffset, toOffset);
	
	// remove any lines that have been obliterated
	fLines->RemoveLineRange(fromOffset, toOffset);
	
	// remove any style runs that have been obliterated
	fStyles->RemoveStyleRange(fromOffset, toOffset);
}
//------------------------------------------------------------------------------
void
BTextView::Undo(BClipboard *clipboard)
{
	CALLED();
	if (fUndo)
		fUndo->Undo(clipboard);
}
//------------------------------------------------------------------------------
undo_state
BTextView::UndoState(bool *isRedo) const
{
	CALLED();
	return fUndo == NULL ? B_UNDO_UNAVAILABLE : fUndo->State(isRedo);
}
//------------------------------------------------------------------------------
void
BTextView::GetDragParameters(BMessage *drag, BBitmap **bitmap,
								  BPoint *point, BHandler **handler)
{
	CALLED();
	if (drag == NULL)
		return;

	// What is this for ? 
	drag->AddInt32("be_actions", B_TRASH_TARGET);
	
	// add the text
	drag->AddData("text/plain", B_MIME_TYPE, fText->Text() + fSelStart, 
			  	  fSelEnd - fSelStart);
	
	// add the corresponding styles
	int32 size = 0;
	text_run_array *styles = RunArray(fSelStart, fSelEnd, &size);
	
	drag->AddData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
		styles, size);
	
	// add the message originator	
	drag->AddPointer("be:originator", this);
	
	free(styles);

	if (bitmap != NULL)
		*bitmap = NULL;
	if (handler != NULL)
		*handler = NULL;
}
//------------------------------------------------------------------------------
void BTextView::_ReservedTextView3() {}
void BTextView::_ReservedTextView4() {}
void BTextView::_ReservedTextView5() {}
void BTextView::_ReservedTextView6() {}
void BTextView::_ReservedTextView7() {}
void BTextView::_ReservedTextView8() {}
void BTextView::_ReservedTextView9() {}
void BTextView::_ReservedTextView10() {}
void BTextView::_ReservedTextView11() {}
void BTextView::_ReservedTextView12() {}


/*! \brief Inits the BTextView object.
	\param textRect The BTextView's text rect.
	\param initialFont The font which the BTextView will use.
	\param initialColor The initial color of the text.
*/
void
BTextView::InitObject(BRect textRect, const BFont *initialFont,
						   const rgb_color *initialColor)
{
	CALLED();
	fTextRect = textRect;

	BFont font;
	if (initialFont == NULL)
		GetFont(&font);
	else
		font = *initialFont;
		
	NormalizeFont(&font);
	
	rgb_color black = {0, 0, 0, 255};
	if (initialColor == NULL)
		initialColor = &black;

	fText = new _BTextGapBuffer_;
	fLines = new _BLineBuffer_;
	fStyles = new _BStyleBuffer_(&font, initialColor);
	
	// We put these here instead of in the constructor initializer list
	// to have less code duplication, and a single place where to do changes
	// if needed.,
	fTextRect = textRect;
	fSelStart = fSelEnd = 0;
	fCaretVisible = false;
	fCaretTime = 0;
	fClickOffset = 0;
	fClickCount = 0;
	fClickTime = 0;
	fDragOffset = -1;
	fCursor = 0;
	fActive = false;
	fStylable = false;
	fSelectable = true;
	fEditable = true;
	fWrap = true;
	fMaxBytes = LONG_MAX;
	fDisallowedChars = NULL;
	fAlignment = B_ALIGN_LEFT;
	fAutoindent = false;
	fOffscreen = NULL;
	fColorSpace = B_CMAP8;
	fResizable = false;
	fContainerView = NULL;
	fUndo = NULL;
	fInline = NULL;
	fDragRunner = NULL;
	fClickRunner = NULL;
	fTrackingMouse = NULL;
	fTextChange = NULL;
}


/*! \brief Called when Backspace key is pressed.
*/
void
BTextView::HandleBackspace()
{
	CALLED();
	if (fUndo) {
		_BTypingUndoBuffer_ *undoBuffer = dynamic_cast<_BTypingUndoBuffer_ *>(fUndo);
		if (!undoBuffer) {
			delete fUndo;
			fUndo = undoBuffer = new _BTypingUndoBuffer_(this);
		}
		undoBuffer->BackwardErase();
	}
	
	if (fSelStart == fSelEnd) {
		if (fSelStart == 0)
			return;
		else 
			fSelStart = PreviousInitialByte(fSelStart);
	} else
		Highlight(fSelStart, fSelEnd);
	
	DeleteText(fSelStart, fSelEnd);
	fSelEnd = fSelStart;
	
	Refresh(fSelStart, fSelEnd, true, false);
}


/*! \brief Called when any arrow key is pressed.
	\param inArrowKey The code for the pressed key.
*/
void
BTextView::HandleArrowKey(uint32 inArrowKey)
{
	CALLED();
	// return if there's nowhere to go
	if (fText->Length() == 0)
		return;
			
	int32 selStart = fSelStart;
	int32 selEnd = fSelEnd;
	//int32	delta = 0;
	int32 scrollToOffset = 0;
	bool shiftDown = modifiers() & B_SHIFT_KEY;

	switch (inArrowKey) {
		case B_LEFT_ARROW:
			if (shiftDown) {
				if (selStart > 0)
					selStart = PreviousInitialByte(selStart);
			} else {
				if (selStart == selEnd) {
					if (selStart > 0) 
						selEnd = selStart = PreviousInitialByte(selStart);
				} else
					selEnd = selStart;
			}
			scrollToOffset = selStart;
			break;
			
		case B_RIGHT_ARROW:
			if (shiftDown) {
				if (selEnd < fText->Length())
					selEnd = NextInitialByte(selEnd);
			} else {
				if (selStart == selEnd) {
					if (selStart < fText->Length())
						selStart = selEnd = NextInitialByte(selEnd);
				}
				else
					selStart = selEnd;
			}
			scrollToOffset = selEnd;
			break;
			
		case B_UP_ARROW:
		{
			BPoint point = PointAt(selStart);
			point.y--;
			selStart = OffsetAt(point);
			if (!shiftDown)
				selEnd = selStart;
			scrollToOffset = selStart;
			break;
		}
		
		case B_DOWN_ARROW:
		{
			float height;
			BPoint point = PointAt(selEnd, &height);
			point.y += height;
			selEnd = OffsetAt(point);
			if (!shiftDown)
				selStart = selEnd;
			scrollToOffset = selEnd;
			break;
		}
	}
	
	// invalidate the null style
	fStyles->InvalidateNullStyle();
	
	Select(selStart, selEnd);
	
	// scroll if needed
	ScrollToOffset(scrollToOffset);
}


/*! \brief Called when the Delete key is pressed.
*/
void
BTextView::HandleDelete()
{
	CALLED();
	if (fUndo) {
		_BTypingUndoBuffer_ *undoBuffer = dynamic_cast<_BTypingUndoBuffer_ *>(fUndo);
		if (!undoBuffer) {
			delete fUndo;
			fUndo = undoBuffer = new _BTypingUndoBuffer_(this);
		}
		undoBuffer->ForwardErase();
	}	
	
	if (fSelStart == fSelEnd) {
		if (fSelEnd == fText->Length())
			return;
		else 
			fSelEnd = NextInitialByte(fSelEnd);
	} else
		Highlight(fSelStart, fSelEnd);
	
	DeleteText(fSelStart, fSelEnd);
	
	fSelEnd = fSelStart;
	
	Refresh(fSelStart, fSelEnd, true, true);
}
//------------------------------------------------------------------------------
void
BTextView::HandlePageKey(uint32 inPageKey)
{
	CALLED();
	switch (inPageKey) {
		case B_HOME:
		case B_END:
			ScrollToOffset((inPageKey == B_HOME) ? 0 : fText->Length());
			break;
			
		case B_PAGE_UP: 
		case B_PAGE_DOWN:
		{
			if (ScrollBar(B_VERTICAL) != NULL) {
				float delta = Bounds().Height();
				delta = (inPageKey == B_PAGE_UP) ? -delta : delta;
				ScrollBar(B_VERTICAL)->SetValue(ScrollBar(B_VERTICAL)->Value() + delta);
			}
			break;
		}
	}
}
//------------------------------------------------------------------------------
void
BTextView::HandleAlphaKey(const char *bytes, int32 numBytes)
{
	CALLED();
	if (fUndo) {
		_BTypingUndoBuffer_ *undoBuffer = dynamic_cast<_BTypingUndoBuffer_ *>(fUndo);
		if (!undoBuffer) {
			delete fUndo;
			fUndo = undoBuffer = new _BTypingUndoBuffer_(this);
		}
		undoBuffer->InputCharacter(numBytes);
	}

	bool refresh = fSelStart != fText->Length();

	if (fSelStart != fSelEnd) {
		Highlight(fSelStart, fSelEnd);
		DeleteText(fSelStart, fSelEnd);
		refresh = true;
	}
	
/*	if (fAutoindent && numBytes == 1 && *bytes == B_ENTER)
	{
		int32 start, offset;
		start = offset = OffsetAt(LineAt(fSelStart));
		const char *text = Text();
		
		while (*(text + offset) != '\0' &&
			*(text + offset) == B_TAB || *(text + offset) == B_SPACE)
			offset++;

		if (start != offset)
			InsertText(text + start, offset - start, fSelStart, NULL);

		InsertText(bytes, numBytes, fSelStart, NULL);
		numBytes += offset - start;
	}	
	else*/
		InsertText(bytes, numBytes, fSelStart, NULL);
	
	fSelEnd = fSelStart = fSelStart + numBytes;

	Refresh(fSelStart, fSelEnd, refresh, true);
}


/*! \brief Redraw the text comprised between the two given offsets,
	recalculating linebreaks if needed.
	\param fromOffset The offset from where to refresh.
	\param toOffset The offset where to refresh to.
	\param erase If true, the function will also erase the textview content
	in the parts where text isn't present.
	\param scroll If true, function will scroll the view to the end offset.
*/
void
BTextView::Refresh(int32 fromOffset, int32 toOffset, bool erase,
						bool scroll)
{
	// TODO: Cleanup
	CALLED();
	float saveHeight = fTextRect.Height();
	int32 fromLine = LineAt(fromOffset);
	int32 toLine = LineAt(toOffset);
	int32 saveFromLine = fromLine;
	int32 saveToLine = toLine;
	float saveLineHeight = LineHeight(fromLine);
	BRect bounds = Bounds();
	
	RecalLineBreaks(&fromLine, &toLine);

	float newHeight = fTextRect.Height();
	
	// if the line breaks have changed, force an erase
	if (fromLine != saveFromLine || toLine != saveToLine
			|| newHeight != saveHeight )
		erase = true;
	
	if (newHeight != saveHeight) {
		// the text area has changed
		if (newHeight < saveHeight)
			toLine = LineAt(BPoint(0.0f, saveHeight + fTextRect.top));
		else
			toLine = LineAt(BPoint(0.0f, newHeight + fTextRect.top));
	}
	
	// draw only those lines that are visible
	int32 fromVisible = LineAt(BPoint(0.0f, bounds.top));
	int32 toVisible = LineAt(BPoint(0.0f, bounds.bottom));
	fromLine = max_c(fromVisible, fromLine);
	toLine = min_c(toLine, toVisible);

	int32 drawOffset = fromOffset;
	if ( LineHeight(fromLine) != saveLineHeight || 
		 newHeight < saveHeight || fromLine < saveFromLine )
		drawOffset = (*fLines)[fromLine]->offset;
	
	// TODO: Is it ok here ?
	if (fResizable)
		AutoResize(false);

	DrawLines(fromLine, toLine, drawOffset, erase);
	
	// erase the area below the text
	BRect eraseRect = bounds;
	eraseRect.top = fTextRect.top + (*fLines)[fLines->NumLines()]->origin;
	eraseRect.bottom = fTextRect.top + saveHeight;
	if (eraseRect.bottom > eraseRect.top && eraseRect.Intersects(bounds)) {
		SetLowColor(ViewColor());
		FillRect(eraseRect, B_SOLID_LOW);
	}
	
	// update the scroll bars if the text area has changed
	if (newHeight != saveHeight)
		UpdateScrollbars();
		
	if (scroll)
		ScrollToOffset(fSelEnd);

	Flush(); ////
}
//------------------------------------------------------------------------------
void
BTextView::RecalLineBreaks(int32 *startLine, int32 *endLine)
{
	CALLED();
	// are we insane?
	*startLine = (*startLine < 0) ? 0 : *startLine;
	*endLine = (*endLine > fLines->NumLines() - 1) ? fLines->NumLines() - 1 : *endLine;
	
	int32 textLength = fText->Length();
	int32 lineIndex = (*startLine > 0) ? *startLine - 1 : 0;
	int32 recalThreshold = (*fLines)[*endLine + 1]->offset;
	float width = fTextRect.Width();
	STELinePtr curLine = (*fLines)[lineIndex];
	STELinePtr nextLine = curLine + 1;

	do {
		float ascent, descent;
		int32 fromOffset = curLine->offset;
		int32 toOffset = FindLineBreak(fromOffset, &ascent, 
										 &descent, &width);

		// we want to advance at least by one character
		if (toOffset == fromOffset && fromOffset < textLength)
			toOffset = NextInitialByte(toOffset);
		
		// set the ascent of this line
		curLine->ascent = ascent;
		
		lineIndex++;
		STELine saveLine = *nextLine;		
		if ( lineIndex > fLines->NumLines() || 
			 toOffset < nextLine->offset ) {
			// the new line comes before the old line start, add a line
			STELine newLine;
			newLine.offset = toOffset;
			newLine.origin = curLine->origin + ascent + descent;
			newLine.ascent = 0;
			fLines->InsertLine(&newLine, lineIndex);
		} else {
			// update the exising line
			nextLine->offset = toOffset;
			nextLine->origin = curLine->origin + ascent + descent;
			
			// remove any lines that start before the current line
			while ( lineIndex < fLines->NumLines() &&
					toOffset >= ((*fLines)[lineIndex] + 1)->offset )
				fLines->RemoveLines(lineIndex + 1);
			
			nextLine = (*fLines)[lineIndex];
			if (nextLine->offset == saveLine.offset) {
				if (nextLine->offset >= recalThreshold) {
					if (nextLine->origin != saveLine.origin)
						fLines->BumpOrigin(nextLine->origin - saveLine.origin, 
										  lineIndex + 1);
					break;
				}
			} else {
				if (lineIndex > 0 && lineIndex == *startLine)
					*startLine = lineIndex - 1;
			}
		}

		curLine = (*fLines)[lineIndex];
		nextLine = curLine + 1;
	} while (curLine->offset < textLength);

	// update the text rect
	float newHeight = TextHeight(0, fLines->NumLines() - 1);
	fTextRect.bottom = fTextRect.top + newHeight;

	*endLine = lineIndex - 1;
	*startLine = min_c(*startLine, *endLine);
}
//------------------------------------------------------------------------------
int32
BTextView::FindLineBreak(int32 fromOffset, float *outAscent,
							   float *outDescent, float	*ioWidth)
{
	CALLED();
	*outAscent = 0.0;
	*outDescent = 0.0;
	
	const int32 limit = fText->Length();

	// is fromOffset at the end?
	if (fromOffset >= limit) {
		// try to return valid height info anyway			
		if (fStyles->NumRuns() > 0)
			fStyles->Iterate(fromOffset, 1, NULL, NULL, outAscent, outDescent);
		else {
			if (fStyles->IsValidNullStyle()) {
				const BFont *font = NULL;
				fStyles->GetNullStyle(&font, NULL);
				
				font_height fh;
				font->GetHeight(&fh);
				*outAscent = fh.ascent;
				*outDescent = fh.descent + fh.leading;
			}
		}
		
		return limit;
	}
	
	bool done = false;
	float ascent = 0.0;
	float descent = 0.0;
	int32 offset = fromOffset;
	int32 delta = 0;
	float deltaWidth = 0.0;
	float tabWidth = 0.0;
	float strWidth = 0.0;
	
	// do we need to wrap the text?
	if (!fWrap) {
		offset = limit - fromOffset;
		fText->FindChar('\n', fromOffset, &offset);
		offset += fromOffset;
		offset = (offset < limit) ? offset + 1 : limit;
		
		// iterate through the style runs
		int32 length = offset;
		int32 startOffset = fromOffset;
		int32 numChars;
		while ((numChars = fStyles->Iterate(startOffset, length, NULL, NULL, &ascent, &descent)) != 0) {
			*outAscent = max_c(ascent, *outAscent);
			*outDescent = max_c(descent, *outDescent);
			
			startOffset += numChars;
			length -= numChars;
		}
		
		return offset;
	}
	
	// wrap the text
	do {
		bool foundTab = false;
		
		// find the next line break candidate
		for ( ; (offset + delta) < limit ; delta++) {
			if (CanEndLine(offset + delta))
				break;
		}
		for ( ; (offset + delta) < limit; delta++) {
			uchar theChar = (*fText)[offset + delta];
			if (!CanEndLine(offset + delta))
				break;
			
			if (theChar == '\n') {
				// found a newline, we're done!
				done = true;
				delta++;
				break;
			} else {
				// include all trailing spaces and tabs,
				// but not spaces after tabs
				if (theChar != B_SPACE && theChar != B_TAB)
					break;
				else {
					if (theChar == B_SPACE && foundTab)
						break;
					else {
						if (theChar == B_TAB)
							foundTab = true;
					}
				}
			}
		}
		delta = max_c(delta, 1);

		deltaWidth = StyledWidth(offset, delta, &ascent, &descent);
		strWidth += deltaWidth;

		if (!foundTab)
			tabWidth = 0.0;
		else {
			int32 tabCount = 0;
			for (int32 i = delta - 1; (*fText)[offset + i] == B_TAB; i--)
				tabCount++;
				
			tabWidth = ActualTabWidth(strWidth);
			if (tabCount > 1)
				tabWidth += ((tabCount - 1) * fTabWidth);
			strWidth += tabWidth;
		}
			
		if (strWidth >= *ioWidth) {
			// we've found where the line will wrap
			bool foundNewline = done;
			done = true;
			int32 pos = delta - 1;
			if ((*fText)[offset + pos] != B_SPACE &&
				(*fText)[offset + pos] != B_TAB &&
				(*fText)[offset + pos] != '\n')
				break;
			
			strWidth -= (deltaWidth + tabWidth);
			
			for ( ; ((offset + pos) > offset); pos--) {
				uchar theChar = (*fText)[offset + pos];
				if (theChar != B_SPACE &&
					theChar != B_TAB &&
					theChar != '\n')
					break;
			}

			strWidth += StyledWidth(offset, pos + 1, &ascent, &descent);
			if (strWidth >= *ioWidth)
				break;

			if (!foundNewline) {
				for ( ; (offset + delta) < limit; delta++) {
					if ((*fText)[offset + delta] != B_SPACE &&
						(*fText)[offset + delta] != B_TAB)
						break;
				}
				if ( (offset + delta) < limit && 
					 (*fText)[offset + delta] == '\n' )
					delta++;
			}
			// get the ascent and descent of the spaces/tabs
			StyledWidth(offset, delta, &ascent, &descent);
		}
		
		*outAscent = max_c(ascent, *outAscent);
		*outDescent = max_c(descent, *outDescent);
		
		offset += delta;
		delta = 0;
	} while (offset < limit && !done);
	
	if (offset - fromOffset < 1) {
		// there weren't any words that fit entirely in this line
		// force a break in the middle of a word
		*outAscent = 0.0;
		*outDescent = 0.0;
		strWidth = 0.0;
		
		for (offset = fromOffset; offset < limit; offset++) {
			strWidth += StyledWidth(offset, 1, &ascent, &descent);
			
			if (strWidth >= *ioWidth)
				break;
				
			*outAscent = max_c(ascent, *outAscent);
			*outDescent = max_c(descent, *outDescent);
		}
	}
	
	offset = min_c(offset, limit);
	
	return offset;
}


/*! \brief Calculate the width of the text within the given limits.
	\param fromOffset The offset where to start.
	\param length The length of the text to examine.
	\param outAscent A pointer to a float which will contain the maximum ascent.
	\param outDescent A pointer to a float which will contain the maximum descent.
	\return The width for the text within the given limits.
*/
float
BTextView::StyledWidth(int32 fromOffset, int32 length, float *outAscent,
							 float *outDescent) const
{
	CALLED();
	float result = 0.0;
	float ascent = 0.0;
	float descent = 0.0;
	float maxAscent = 0.0;
	float maxDescent = 0.0;
	
	// iterate through the style runs
	const BFont *font = NULL;
	int32 numChars;
	while ((numChars = fStyles->Iterate(fromOffset, length, &font, NULL, &ascent, &descent)) != 0) {		
		maxAscent = max_c(ascent, maxAscent);
		maxDescent = max_c(descent, maxDescent);
		
		// TODO: Change this with a call to _BWidthBuffer_::StringWidth()
		// as soon as everything else work
		result += font->StringWidth(fText->Text() + fromOffset, numChars);

		fromOffset += numChars;
		length -= numChars;
	}

	if (outAscent != NULL)
		*outAscent = maxAscent;
	if (outDescent != NULL)
		*outDescent = maxDescent;

	return result;
}


/*! \brief Calculate the actual tab width for the given location.
	\param location The location to calculate the tab width of.
	\return The actual tab width for the given location
*/
float
BTextView::ActualTabWidth(float location) const
{
	CALLED();
	return fTabWidth - fmod(location, fTabWidth);
}
//------------------------------------------------------------------------------
void
BTextView::DoInsertText(const char *inText, int32 inLength, int32 inOffset,
							 const text_run_array *inRuns,
							 _BTextChangeResult_ *outResult)
{
	CALLED();
}
//------------------------------------------------------------------------------
void
BTextView::DoDeleteText(int32 fromOffset, int32 toOffset,
							 _BTextChangeResult_ *outResult)
{
	CALLED();
}
//------------------------------------------------------------------------------		
void
BTextView::DrawLines(int32 startLine, int32 endLine, int32 startOffset,
						  bool erase)
{
	CALLED();	
	// clip the text
	BRect clipRect = Bounds() & fTextRect;
	clipRect.InsetBy(-1, -1);
	BRegion newClip;
	newClip.Set(clipRect);
	ConstrainClippingRegion(&newClip);

	// set the low color to the view color so that 
	// drawing to a non-white background will work	
	SetLowColor(ViewColor());

	long maxLine = fLines->NumLines() - 1;
	startLine = (startLine < 0) ? 0 : startLine;
	endLine = (endLine > maxLine) ? maxLine : endLine;

	BRect eraseRect = clipRect;
	long startEraseLine = startLine;
	STELinePtr line = (*fLines)[startLine];
	if (erase && startOffset != -1) {
		// erase only to the right of startOffset
		startEraseLine++;
		long startErase = startOffset;
		if (startErase > line->offset) {
			for ( ; ((*fText)[startErase] != B_SPACE) && ((*fText)[startErase] != B_TAB); startErase--) {
				if (startErase <= line->offset)
					break;	
			}
			if (startErase > line->offset)
				startErase--;
		}
		
		eraseRect.left = PointAt(startErase).x;
		eraseRect.top = line->origin + fTextRect.top;
		eraseRect.bottom = (line + 1)->origin + fTextRect.top;
		
		FillRect(eraseRect, B_SOLID_LOW);

		eraseRect = clipRect;
	}

	for (long i = startLine; i <= endLine; i++) {
		long length = (line + 1)->offset - line->offset;
		// DrawString() chokes if you draw a newline
		if ((*fText)[(line + 1)->offset - 1] == '\n')
			length--;	
		
		MovePenTo(fTextRect.left, line->origin + line->ascent + fTextRect.top);

		if (erase && i >= startEraseLine) {
			eraseRect.top = line->origin + fTextRect.top;
			eraseRect.bottom = (line + 1)->origin + fTextRect.top;
			
			FillRect(eraseRect, B_SOLID_LOW);
		}
		
		// do we have any text to draw?
		if (length > 0) {
			// iterate through each style on this line
			//BPoint		startPenLoc;
			bool foundTab = false;
			long tabChars = 0;
			long numTabs = 0;
			long offset = line->offset;
			const BFont *font = NULL;
			const rgb_color *color = NULL;
			int32 numChars;
			while ((numChars = fStyles->Iterate(offset, length, &font, &color)) != 0) {
				SetFont(font);
				SetHighColor(*color);
				
				tabChars = numChars;
				do {
					//if (style->underline)
					//	startPenLoc = PenLocation();
					
					foundTab = fText->FindChar(B_TAB, offset, &tabChars);
					if (foundTab) {
						for (numTabs = 0; (tabChars + numTabs) < numChars; numTabs++) {
							if ((*fText)[offset + tabChars + numTabs] != B_TAB)
								break;
						}
					}

					DrawString(fText->GetString(offset, tabChars), tabChars);
					
					if (foundTab) {
						float penPos = PenLocation().x - fTextRect.left;
						float tabWidth = ActualTabWidth(penPos);
						if (numTabs > 1)
							tabWidth += ((numTabs - 1) * fTabWidth);
							
						MovePenBy(tabWidth, 0.0);

						tabChars += numTabs;
					}
					
					/*if (style->underline) {
						BPoint savePenLoc = PenLocation();
						BPoint curPenLoc = savePenLoc;
						startPenLoc.y += 1.0;
						curPenLoc.y += 1.0;

						StrokeLine(startPenLoc, curPenLoc);
						
						MovePenTo(savePenLoc);
					}*/

					offset += tabChars;
					length -= tabChars;
					numChars -= tabChars;
					tabChars = numChars;
					numTabs = 0;
				} while (foundTab && tabChars > 0);
			}
		}
		line++;
	}

	ConstrainClippingRegion(NULL);
}
//------------------------------------------------------------------------------
void
BTextView::DrawCaret(int32 offset)
{
	CALLED();
	//long 		lineNum = LineAt(offset);
	//STELinePtr	line = (*fLines)[lineNum];
	float lineHeight;
	BPoint caretPoint = PointAt(offset, &lineHeight);
	caretPoint.x = (caretPoint.x > fTextRect.right) ? fTextRect.right : caretPoint.x;
	
	BRect caretRect;
	caretRect.left = caretRect.right = caretPoint.x;
	caretRect.top = caretPoint.y;
	caretRect.bottom = caretPoint.y + lineHeight;
	
	InvertRect(caretRect);

	Flush(); ////
}


/*! \brief Inverts the blinking caret status.
	Hides the caret if it is being shown, and if it's hidden, shows it.
*/
void
BTextView::InvertCaret()
{
	CALLED();
	DrawCaret(fSelStart);
	fCaretVisible = !fCaretVisible;
	fCaretTime = system_time();
}


/*! \brief Place the blinking caret at the given offset.
	\param offset The offset (zero based within the object's text) where to place
	the blinking caret. If it's -1, hide the caret.
*/
void
BTextView::DragCaret(int32 offset)
{
	CALLED();
	// does the caret need to move?
	if (offset == fDragOffset)
		return;
	
	// hide the previous drag caret
	if (fDragOffset != -1)
		DrawCaret(fDragOffset);
		
	// do we have a new location?
	if (offset != -1) {
		if (fActive) {
			// ignore if offset is within active selection
			if (offset >= fSelStart && offset <= fSelEnd) {
				fDragOffset = -1;
				return;
			}
		}
		
		DrawCaret(offset);
	}
	
	fDragOffset = offset;
}
//------------------------------------------------------------------------------
void
BTextView::StopMouseTracking()
{
	CALLED();
}
//------------------------------------------------------------------------------
bool
BTextView::PerformMouseUp(BPoint where)
{
	CALLED();
	return false;
}
//------------------------------------------------------------------------------
bool BTextView::PerformMouseMoved(BPoint where, uint32 code)
{
	CALLED();
	return false;
}


/*! \brief Tracks the mouse position, doing special actions like changing the view cursor.
	\param where The point where the mouse has moved.
	\param message The dragging message, if there is any.
	\param force Passed as second parameter of SetViewCursor()
*/
void
BTextView::TrackMouse(BPoint where, const BMessage *message, bool force)
{
	CALLED();

	BRegion textRegion;
	GetTextRegion(fSelStart, fSelEnd, &textRegion);
	
	if (AcceptsDrop(message))
		TrackDrag(where);
	else if (!textRegion.Contains(where))
		SetViewCursor(B_CURSOR_I_BEAM, force);
		// If we are within the selection, switch to the "hand" cursor,
	else
		SetViewCursor(B_CURSOR_SYSTEM_DEFAULT, force);
}


/*! \brief Tracks the mouse position when the user is dragging some data.
	\param where The point where the mouse has moved.
*/
void
BTextView::TrackDrag(BPoint where)
{
	CALLED();
	if (Bounds().Contains(where)) {
		int32 offset = OffsetAt(where);
		DragCaret(offset);
	}
}


/*! \brief Function called to initiate a drag operation.
*/
void
BTextView::InitiateDrag()
{
	CALLED();
	BMessage *drag = new BMessage(B_MIME_DATA);
	BBitmap *dragBitmap = NULL;
	BPoint bitmapPoint;
	BHandler *dragHandler = NULL;
	
	GetDragParameters(drag, &dragBitmap, &bitmapPoint, &dragHandler);
	
	SetViewCursor(B_CURSOR_SYSTEM_DEFAULT);
	
	if (dragBitmap != NULL)
		DragMessage(drag, dragBitmap, bitmapPoint, dragHandler);
	else {
		BRegion hiliteRgn;
		GetTextRegion(fSelStart, fSelEnd, &hiliteRgn);
		BRect bounds = Bounds();
		BRect dragRect = hiliteRgn.Frame();
		if (!bounds.Contains(dragRect))
			dragRect = bounds & dragRect;
			
		DragMessage(drag, dragRect, dragHandler);
	}
}
//------------------------------------------------------------------------------
bool
BTextView::MessageDropped(BMessage *inMessage, BPoint where, BPoint offset)
{
	CALLED();
	
	void *from = NULL;
	bool internalDrop = false;
	if (inMessage->FindPointer("be:originator", &from) == B_OK
			&& from == this && fSelEnd != fSelStart)
		internalDrop = true;
	
	DragCaret(-1);
	TrackMouse(where, NULL);
		
	// are we sure we like this message?
	if (!AcceptsDrop(inMessage))
		return false;
		
	long dropOffset = OffsetAt(where);
	if (dropOffset > TextLength())
		dropOffset = TextLength();
			
	// if this view initiated the drag, move instead of copy
	if (internalDrop) {
		// dropping onto itself?
		if (dropOffset >= fSelStart && dropOffset <= fSelEnd)
			return true; 
	}
	
	ssize_t dataLen = 0;
	const char *text = NULL;
	if (inMessage->FindData("text/plain", B_MIME_TYPE, (const void **)&text, &dataLen) == B_OK) {
		
		text_run_array *runArray = NULL;
		ssize_t runLen = 0;
		if (fStylable)
			inMessage->FindData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
					(const void **)&runArray, &runLen);
		
		if (fUndo) {
			delete fUndo;
			fUndo = new _BDropUndoBuffer_(this, text, dataLen, runArray, runLen, dropOffset, internalDrop);
		}
		
		if (internalDrop) {
			if (dropOffset > fSelEnd) 
				dropOffset -= dataLen;
			Delete();
		}
				
		Insert(dropOffset, text, dataLen, runArray);
	}
	
	return true;
}


/*! \brief Updates the scrollbars associated with the object (if any).
*/				
void
BTextView::UpdateScrollbars()
{
	CALLED();
	
	BRect bounds(Bounds());
	BScrollBar *hsb = ScrollBar(B_HORIZONTAL);
 	BScrollBar *vsb = ScrollBar(B_VERTICAL);

	// do we have a horizontal scroll bar?
	if (hsb != NULL) {
		long viewWidth = bounds.IntegerWidth();
		long dataWidth = fTextRect.IntegerWidth();
		dataWidth += (long)ceil(fTextRect.left) + 1;
		
		long maxRange = dataWidth - viewWidth;
		maxRange = max_c(maxRange, 0);
		
		hsb->SetRange(0, (float)maxRange);
		hsb->SetProportion((float)viewWidth / (float)dataWidth);
		hsb->SetSteps(10, dataWidth / 10);
	}
	
	// how about a vertical scroll bar?
	if (vsb != NULL) {
		long viewHeight = bounds.IntegerHeight();
		long dataHeight = fTextRect.IntegerHeight();
		dataHeight += (long)ceil(fTextRect.top) + 1;
		
		long maxRange = dataHeight - viewHeight;
		maxRange = max_c(maxRange, 0);
		
		vsb->SetRange(0, maxRange);
		vsb->SetProportion((float)viewHeight / (float)dataHeight);
		vsb->SetSteps(12, viewHeight);
	}
}


/*!	\brief Autoresizes the view to fit the contained text.
*/
void
BTextView::AutoResize(bool doredraw)
{
	CALLED();
	// TODO: Implement
}


/*! \brief Creates a new offscreen BBitmap with an associated BView.
	param padding Padding (?)
	
	Creates an offscreen BBitmap which will be used to draw.
*/
void
BTextView::NewOffscreen(float padding)
{
	CALLED();
	if (fOffscreen != NULL)
		DeleteOffscreen();
	
	// TODO: Is this correct ?
	BRect bitmapRect(0, 0, fTextRect.Width() + padding, fTextRect.Height());
	fOffscreen = new BBitmap(bitmapRect, fColorSpace, true, false);
	if (fOffscreen != NULL && fOffscreen->Lock()) {
		BView *bufferView = new BView(bitmapRect, "drawing view", 0, 0);
		fOffscreen->AddChild(bufferView);
		fOffscreen->Unlock();
	}
}


/*! \brief Deletes the textview's offscreen bitmap, if any.
*/ 
void
BTextView::DeleteOffscreen()
{
	CALLED();
	if (fOffscreen != NULL && fOffscreen->Lock()) {
		delete fOffscreen;
		fOffscreen = NULL;
	}	
}


/*!	\brief Creates a new offscreen bitmap, highlight the selection, and set the
	cursor to B_CURSOR_I_BEAM.
*/
void
BTextView::Activate()
{
	CALLED();
	fActive = true;
	
	// Create a new offscreen BBitmap
	NewOffscreen();

	if (fSelStart != fSelEnd) {
		if (fSelectable)
			Highlight(fSelStart, fSelEnd);
	} else {
		if (fEditable)
			InvertCaret();
	}
	
	BPoint where;
	ulong buttons;
	GetMouse(&where, &buttons);
	if (Bounds().Contains(where))
		SetViewCursor(B_CURSOR_I_BEAM);
}


/*! \brief Unhilights the selection, set the cursor to B_CURSOR_SYSTEM_DEFAULT.
*/
void
BTextView::Deactivate()
{
	CALLED();
	fActive = false;
	
	if (fSelStart != fSelEnd) {
		if (fSelectable)
			Highlight(fSelStart, fSelEnd);
	} else {
		if (fCaretVisible)
			InvertCaret();
	}
	
	BPoint where;
	ulong buttons;
	GetMouse(&where, &buttons);
	if (Bounds().Contains(where))
		SetViewCursor(B_CURSOR_SYSTEM_DEFAULT);
}


/*! \brief Changes the passed font to be displayable by the object.
	\param font A pointer to the font to normalize.

	Set font rotation to 0, removes any font flag, set font spacing
	to \c B_BITMAP_SPACING and font encoding to \c B_UNICODE_UTF8
*/
void
BTextView::NormalizeFont(BFont *font)
{
	CALLED();
	font->SetRotation(0.0f);
	font->SetFlags(0);
	font->SetSpacing(B_BITMAP_SPACING);
	font->SetEncoding(B_UNICODE_UTF8);
}


/*! \brief Returns a value which tells if the given charachter is a separator
	charachter or not.
	\param offset The offset where the wanted charachter can be found.
	\return A value which represents the charachter's classification.
*/
uint32
BTextView::CharClassification(int32 offset) const
{
	CALLED();
	// Should check against a list of character containing also
	// japanese word breakers
	switch (fText->RealCharAt(offset)) {
		case B_SPACE:
		case '_':
		case '.':
		case '\0':
		case B_TAB:
		case B_ENTER:
		case '&':
		case '*':
		case '+':
		case '-':
		case '/':
		case '<':
		case '=':
		case '>':
		case '\\':
		case '^':
		case '|':		
			return B_SEPARATOR_CHARACTER;
		default:
			return B_OTHER_CHARACTER;
	}
}


/*! \brief Returns the offset of the next UTF8 charachter within the BTextView's text.
	\param offset The offset where to start looking.
	\return The offset of the next UTF8 charachter.
*/
int32
BTextView::NextInitialByte(int32 offset) const
{
	CALLED();
	const char *text = Text();

	if (text == NULL)
		return 0;

	for (++offset; (*(text + offset) & 0xc0) == 0x80; ++offset)
		;

	return offset;
}


/*! \brief Returns the offset of the previous UTF8 charachter within the BTextView's text.
	\param offset The offset where to start looking.
	\return The offset of the previous UTF8 charachter.
*/
int32
BTextView::PreviousInitialByte(int32 offset) const
{
	CALLED();
	const char *text = Text();
	int count = 6;
	
	for (--offset; (text + offset) > text && count; --offset, --count) {
		if ((*(text + offset) & 0xc0 ) != 0x80)
			break;
	}

	return count ? offset : 0;
}
//------------------------------------------------------------------------------
bool
BTextView::GetProperty(BMessage *specifier, int32 form,
							const char *property, BMessage *reply)
{
	CALLED();
	if (strcmp(property, "Selection") == 0) {
		reply->what = B_REPLY;
		reply->AddInt32("result", fSelStart);
		reply->AddInt32("result", fSelEnd);
		reply->AddInt32("error", B_OK);

		return true;

	} else if (strcmp(property, "Text") == 0) {
		int32 index, range;
		char *buffer;

		specifier->FindInt32("index", &index);
		specifier->FindInt32("range", &range);

		buffer = new char[range + 1];
		GetText(index, range, buffer);

		reply->what = B_REPLY;
		reply->AddString("result", buffer);
		delete buffer;
		reply->AddInt32("error", B_OK);

		return true;

	} else if (strcmp(property, "text_run_array") == 0)
		return false;
	else
		return false;
}
//------------------------------------------------------------------------------
bool
BTextView::SetProperty(BMessage *specifier, int32 form,
							const char *property, BMessage *reply)
{
	CALLED();
	if (strcmp(property, "Selection") == 0) {
		int32 index, range;

		specifier->FindInt32("index", &index);
		specifier->FindInt32("range", &range);

		Select(index, index + range);

		reply->what = B_REPLY;
		reply->AddInt32("error", B_OK);

		return true;

	} else if (strcmp(property, "Text") == 0) {
		int32 index, range;
		const char *buffer;

		specifier->FindInt32("index", &index);
		specifier->FindInt32("range", &range);
		
		if (specifier->FindString("data", &buffer) == B_OK)
			InsertText(buffer, range, index, NULL);
		else
			DeleteText(index, range);

		reply->what = B_REPLY;
		reply->AddInt32("error", B_OK);

		return true;

	} else if (strcmp(property, "text_run_array") == 0)
		return false;

	else
		return false;
}
//------------------------------------------------------------------------------
bool
BTextView::CountProperties(BMessage *specifier, int32 form,
								const char *property, BMessage *reply)
{
	CALLED();
	if (strcmp(property, "Text") == 0) {
		reply->what = B_REPLY;
		reply->AddInt32("result", TextLength());
		reply->AddInt32("error", B_OK);
		return true;

	} else
		return false;
}


/*! \brief Called when the object receives a B_INPUT_METHOD_CHANGE message.
*/
void
BTextView::HandleInputMethodChanged(BMessage *message)
{
	CALLED();
	// TODO: Implement me
	if (!fInline)
		return;
		
	message->PrintToStream();
}


/*! \brief Called when the object receives a B_INPUT_METHOD_LOCATION_REQUEST message.
*/
void
BTextView::HandleInputMethodLocationRequest()
{
	CALLED();
	if (!fInline)
		return;
	// TODO: Implement me
}


void
BTextView::CancelInputMethod()
{
	// TODO: Implement me
	CALLED();
}


/*! \brief Locks the static _BWidthBuffer_ object to be able to access it safely.
*/
void
BTextView::LockWidthBuffer()
{
	CALLED();
	if (atomic_add(&sWidthAtom, 1) > 0) {
		while (acquire_sem(sWidthSem) == B_INTERRUPTED)
			;
	}
}


/*! \brief Unlocks the static _BWidthBuffer_ object.
*/
void
BTextView::UnlockWidthBuffer()
{
	CALLED();
	if (atomic_add(&sWidthAtom, -1) > 1)
		release_sem(sWidthSem);
}