Some more work on the undo buffer. Added a quick and dirty implementation of WidthBuffer (it's needed by OpenTracker). We'll want to implement it correctly.

Multi-byte character insertion/deletion works now in TextView (thanks to Marc Flerackers)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5135 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/BTextView/TextGapBuffer.h

@@ -23,6 +23,8 @@
 //	Author:			Marc Flerackers ([email protected])
 //	Description:	Text storage used by BTextView
 //------------------------------------------------------------------------------
+#ifndef __TEXTGAPBUFFER_H
+#define __TEXTGAPBUFFER_H
 
 // Standard Includes -----------------------------------------------------------
 
@@ -92,6 +94,8 @@ _BTextGapBuffer_::operator[](long index) const
 {
 	return (index < fGapIndex) ? fBuffer[index] : fBuffer[index + fGapCount];
 }
+
+#endif //__TEXTGAPBUFFER_H
 /*
  * $Log $
  *

src/kits/interface/BTextView/TextView.cpp

@@ -47,6 +47,7 @@
 #include "StyleBuffer.h"
 #include "TextGapBuffer.h"
 #include "UndoBuffer.h"
+#include "WidthBuffer.h"
 
 // Local Defines ---------------------------------------------------------------
 
@@ -141,9 +142,13 @@ prop_list[] =
 	{ 0 }
 };
 
-sem_id BTextView::sWidthSem = B_BAD_SEM_ID; // Created/deleted by init/fini_interface_kit
+
+// 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)
@@ -285,6 +290,7 @@ BTextView::~BTextView()
 	delete fStyles;
 	delete fDisallowedChars;
 	delete fUndo;
+	delete fOffscreen;
 }
 //------------------------------------------------------------------------------
 BArchivable *
@@ -387,7 +393,8 @@ BTextView::MouseDown(BPoint where)
 		BPoint	loc;
 		ulong	buttons;
 		GetMouse(&loc, &buttons);
-		// was the secondary button clicked?
+		// 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)) {
@@ -559,6 +566,7 @@ BTextView::WindowActivated(bool state)
 void
 BTextView::KeyDown(const char *bytes, int32 numBytes)
 {
+	//TODO: Remove this and move it to specific key handlers ?
 	if (!fEditable)
 		return;
 	
@@ -1072,7 +1080,7 @@ BTextView::Copy(BClipboard *clipboard)
 				fSelEnd - fSelStart);
 			
 			int32 size;
-			if (IsStylable()) {
+			if (fStylable) {
 				text_run_array *runArray = RunArray(fSelStart, fSelEnd, &size);
 				clip->AddData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
 					runArray, size);
@@ -1099,7 +1107,7 @@ BTextView::Paste(BClipboard *clipboard)
 				text_run_array *runArray = NULL;
 				ssize_t runLen = 0;
 				
-				if (IsStylable())
+				if (fStylable)
 					clip->FindData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
 						(const void **)&runArray, &runLen);
 
@@ -1458,10 +1466,10 @@ BTextView::OffsetAt(BPoint point) const
 {
 	// should we even bother?
 	if (point.y >= fTextRect.bottom)
-		return (fText->Length());
+		return fText->Length();
 	else {
 		if (point.y < fTextRect.top)
-			return (0);
+			return 0;
 	}
 
 	int32		lineNum = LineAt(point);
@@ -1942,7 +1950,8 @@ BTextView::SetAlignment(alignment flag)
 	fAlignment = flag;
 }
 //------------------------------------------------------------------------------
-alignment BTextView::Alignment() const
+alignment
+BTextView::Alignment() const
 {
 	return fAlignment;
 }
@@ -2004,6 +2013,8 @@ BTextView::DoesUndo() const
 void
 BTextView::HideTyping(bool enabled)
 {
+	//TODO: Implement ?
+	//fText->SetPasswordMode(enabled);
 }
 //------------------------------------------------------------------------------
 bool
@@ -2248,14 +2259,6 @@ BTextView::InitObject(BRect textRect, const BFont *initialFont,
 void
 BTextView::HandleBackspace()
 {
-	if (fSelStart == fSelEnd) {
-		if (fSelStart == 0)
-			return;
-		else 
-			fSelStart--;
-	}
-	else
-		Highlight(fSelStart, fSelEnd);
 
 	if (fUndo) {
 		_BTypingUndoBuffer_ *undoBuffer = dynamic_cast<_BTypingUndoBuffer_ *>(fUndo);
@@ -2266,6 +2269,14 @@ BTextView::HandleBackspace()
 		undoBuffer->BackwardErase();
 	}
 	
+	if (fSelStart == fSelEnd) {
+		if (fSelStart == 0)
+			return;
+		else 
+			fSelStart = PreviousInitialByte(fSelStart);
+	} else
+		Highlight(fSelStart, fSelEnd);
+	
 	DeleteText(fSelStart, fSelEnd);
 	fSelEnd = fSelStart;
 	
@@ -2354,15 +2365,6 @@ BTextView::HandleArrowKey(uint32 inArrowKey)
 void
 BTextView::HandleDelete()
 {
-	if (fSelStart == fSelEnd) {
-		if (fSelEnd == fText->Length())
-			return;
-		else 
-			fSelEnd = NextInitialByte(fSelEnd);
-	}
-	else
-		Highlight(fSelStart, fSelEnd);
-	
 	if (fUndo) {
 		_BTypingUndoBuffer_ *undoBuffer = dynamic_cast<_BTypingUndoBuffer_ *>(fUndo);
 		if (!undoBuffer) {
@@ -2372,6 +2374,15 @@ BTextView::HandleDelete()
 		undoBuffer->ForwardErase();
 	}	
 	
+	if (fSelStart == fSelEnd) {
+		if (fSelEnd == fText->Length())
+			return;
+		else 
+			fSelEnd = NextInitialByte(fSelEnd);
+	}
+	else
+		Highlight(fSelStart, fSelEnd);
+	
 	DeleteText(fSelStart, fSelEnd);
 	
 	fSelEnd = fSelStart;
@@ -2404,8 +2415,6 @@ BTextView::HandlePageKey(uint32 inPageKey)
 void
 BTextView::HandleAlphaKey(const char *bytes, int32 numBytes)
 {
-	bool refresh = fSelStart != fText->Length();
-	
 	if (fUndo) {
 		_BTypingUndoBuffer_ *undoBuffer = dynamic_cast<_BTypingUndoBuffer_ *>(fUndo);
 		if (!undoBuffer) {
@@ -2415,6 +2424,8 @@ BTextView::HandleAlphaKey(const char *bytes, int32 numBytes)
 		undoBuffer->InputCharacter(numBytes);
 	}
 
+	bool refresh = fSelStart != fText->Length();
+
 	if (fSelStart != fSelEnd) {
 		Highlight(fSelStart, fSelEnd);
 		DeleteText(fSelStart, fSelEnd);
@@ -2627,10 +2638,10 @@ BTextView::FindLineBreak(int32 fromOffset, float *outAscent,
 		offset = (offset < limit) ? offset + 1 : limit;
 		
 		// iterate through the style runs
-		int32 		length = offset;
-		int32 		startOffset = fromOffset;
+		int32 length = offset;
+		int32 startOffset = fromOffset;
 		int32 numChars;
-		while ((numChars = fStyles->Iterate(startOffset, length, NULL, NULL, &ascent, &descent) != 0)) {
+		while ((numChars = fStyles->Iterate(startOffset, length, NULL, NULL, &ascent, &descent)) != 0) {
 			*outAscent = (ascent > *outAscent) ? ascent : *outAscent;
 			*outDescent = (descent > *outDescent) ? descent : *outDescent;
 			
@@ -2775,7 +2786,7 @@ BTextView::StyledWidth(int32 fromOffset, int32 length, float *outAscent,
 	// iterate through the style runs
 	const BFont *font = NULL;
 	int32 numChars;
-	while ((numChars = fStyles->Iterate(fromOffset, length, &font, NULL, &ascent, &descent) != 0)) {		
+	while ((numChars = fStyles->Iterate(fromOffset, length, &font, NULL, &ascent, &descent)) != 0) {		
 		maxAscent = (ascent > maxAscent) ? ascent : maxAscent;
 		maxDescent = (descent > maxDescent) ? descent : maxDescent;
 		
@@ -2884,7 +2895,7 @@ BTextView::DrawLines(int32 startLine, int32 endLine, int32 startOffset,
 			const BFont *font = NULL;
 			const rgb_color *color = NULL;
 			int32 numChars;
-			while ((numChars = fStyles->Iterate(offset, length, &font, &color) != 0)) {
+			while ((numChars = fStyles->Iterate(offset, length, &font, &color)) != 0) {
 				SetFont(font);
 				SetHighColor(*color);
 				
@@ -3077,7 +3088,7 @@ BTextView::MessageDropped(BMessage *inMessage, BPoint where, BPoint offset)
 		
 		text_run_array *runArray = NULL;
 		ssize_t runLen = 0;
-		if (IsStylable())
+		if (fStylable)
 			inMessage->FindData("application/x-vnd.Be-text_run_array", B_MIME_TYPE,
 					(const void **)&runArray, &runLen);
 		

src/kits/interface/BTextView/UndoBuffer.cpp

@@ -264,7 +264,8 @@ _BTypingUndoBuffer_::_BTypingUndoBuffer_(BTextView *textView)
 	_BUndoBuffer_(textView, B_UNDO_TYPING),
 	fTypedText(NULL),
 	fTypedStart(fStart),
-	fNumBytes(0)
+	fTypedEnd(fEnd),
+	fUndone(0)
 {
 }
 
@@ -278,14 +279,18 @@ _BTypingUndoBuffer_::~_BTypingUndoBuffer_()
 void
 _BTypingUndoBuffer_::UndoSelf(BClipboard *clipboard)
 {
+	int32 len = fTypedEnd - fTypedStart;
+	
 	free(fTypedText);
-	fTypedText = (char *)malloc(fNumBytes);
-	memcpy(fTypedText, fTextView->Text() + fTypedStart, fNumBytes);
+	fTypedText = NULL;
+	fTypedText = (char *)malloc(len);
+	memcpy(fTypedText, fTextView->Text() + fTypedStart, len);
 	
 	fTextView->Select(fTypedStart, fTypedStart);
-	fTextView->Delete(fTypedStart, fTypedStart + fNumBytes);
+	fTextView->Delete(fTypedStart, fTypedEnd);
 	fTextView->Insert(fTextData, fTextLength);
 	fTextView->Select(fStart, fEnd);
+	fUndone++;
 }
 
 
@@ -294,7 +299,8 @@ _BTypingUndoBuffer_::RedoSelf(BClipboard *clipboard)
 {	
 	fTextView->Select(fTypedStart, fTypedStart);
 	fTextView->Delete(fTypedStart, fTypedStart + fTextLength);
-	fTextView->Insert(fTypedText, fNumBytes);
+	fTextView->Insert(fTypedText, fTypedEnd - fTypedStart);
+	fUndone--;
 }
 
 
@@ -304,22 +310,22 @@ _BTypingUndoBuffer_::InputCharacter(int32 len)
 	int32 start, end;
 	fTextView->GetSelection(&start, &end);
 	
-	int32 currentPos = fTypedStart + fNumBytes;
-	if (start != currentPos)
+	if (start != fTypedEnd || end != fTypedEnd)
 		Reset();
 		
-	fNumBytes += len;
+	fTypedEnd += len;
 }
 
 
 void
 _BTypingUndoBuffer_::Reset()
 {
+	printf("Reset\n");
 	free(fTextData);
 	fTextView->GetSelection(&fStart, &fEnd);
 	fTextLength = fEnd - fStart;
 	fTypedStart = fStart;
-	fNumBytes = 0;
+	fTypedEnd = fStart;
 	
 	fTextData = (char *)malloc(fTextLength);
 	memcpy(fTextData, fTextView->Text() + fStart, fTextLength);
@@ -327,36 +333,93 @@ _BTypingUndoBuffer_::Reset()
 	free(fTypedText);
 	fTypedText = NULL;
 	fRedo = false;
+	fUndone = 0;
 }
 
 
-void
-_BTypingUndoBuffer_::ForwardErase()
-{
-	//TODO: Fix this. Currently, it just resets the
-	//undobuffer every time DELETE is pressed, while
-	//it should reset it just the first time it's pressed.
-	//Moreover, it doesn't work with multi-byte characters.
-	int32 start, end;
-	fTextView->GetSelection(&start, &end);
 
-	int32 currentPos = fTypedStart + fNumBytes;
-	if (start != currentPos)
-		Reset();
+// TODO: This isn't completely safe and it's even slower than parsing byte
+// by byte, but I'll change it later.
+static inline int32
+UTF8_char_len(uchar c)
+{
+	return ((0xE5000000 >> ((c >> 3) & 0x1E)) & 3) + 1;
 }
 
 
 void
 _BTypingUndoBuffer_::BackwardErase()
 {
-	//TODO: Fix this. Currently, it just resets the
-	//undobuffer every time BACKSPACE is pressed, while
-	//it should reset it just the first time it's pressed.
-	//Moreover, it doesn't work with multi-byte characters.
 	int32 start, end;
 	fTextView->GetSelection(&start, &end);
 	
-	int32 currentPos = fTypedStart + fNumBytes;
-	if (start != currentPos)
+	int32 charLen = UTF8_char_len(fTextView->ByteAt(start - 1));
+	printf("Char Len: %d\n", charLen);
+
+	if (start != fTypedEnd || end != fTypedEnd) {
 		Reset();
+		// if we've got a selection, we're already done
+		if (start != end)
+			return;
+	} 
+	
+	char *buffer = (char *)malloc(fTextLength + charLen);
+	memcpy(buffer + charLen, fTextData, fTextLength);
+	
+	fTypedStart = start - charLen;
+	start = fTypedStart;
+	for (int32 x = 0; x < charLen; x++)
+		buffer[x] = fTextView->ByteAt(start + x);
+	free(fTextData);
+	fTextData = buffer;
+	
+	fTextLength += charLen;
+	fTypedEnd -= charLen;
+}
+
+
+void
+_BTypingUndoBuffer_::ForwardErase()
+{
+	int32 start, end;
+
+	fTextView->GetSelection(&start, &end);
+
+	int32 charLen = UTF8_char_len(fTextView->ByteAt(start));	
+	printf("Char Len: %d\n", charLen);
+
+	if (start != fTypedEnd || end != fTypedEnd || fUndone > 0) {
+		Reset();
+		// if we've got a selection, we're already done
+		if (fStart == fEnd) {
+			free(fTextData);
+			fTextLength = charLen;
+			fTextData = (char *)malloc(fTextLength);
+			
+			// store the erased character
+			for (int32 x = 0; x < charLen; x++)
+				fTextData[x] = fTextView->ByteAt(start + x);
+		}
+	} else {	
+		// Here we need to store the erased text, so we get the text that it's 
+		// already in the buffer, and we add the erased character.
+		// a realloc + memmove would maybe be cleaner, but that way we spare a
+		// copy (malloc + memcpy vs realloc + memmove).
+		
+		int32 newLength = fTextLength + charLen;
+		char *buffer = (char *)malloc(newLength);
+		
+		// copy the already stored data
+		memcpy(buffer, fTextData, fTextLength);
+		
+		if (fTextLength < newLength) {
+			// store the erased character
+			for (int32 x = 0; x < charLen; x++)
+				buffer[fTextLength] = fTextView->ByteAt(start + x);
+		}
+
+		fTextLength = newLength;
+		free(fTextData);
+		fTextData = buffer;
+	}
 }

src/kits/interface/BTextView/UndoBuffer.h

@@ -56,6 +56,7 @@ protected:
 	
 	bool fRedo;
 private:
+	
 	undo_state fState;
 };
 
@@ -137,7 +138,8 @@ private:
 	
 	char *fTypedText;
 	int32 fTypedStart;
-	int32 fNumBytes;
+	int32 fTypedEnd;
+	int32 fUndone;
 };
 
 #endif //__UNDOBUFFER_H

src/kits/interface/BTextView/WidthBuffer.cpp

@@ -0,0 +1,88 @@
+// A quick and dirty implementation of _BWidthBuffer_, needed to compile
+// OpenTracker. We'll want to implement it correctly.
+
+#include <Font.h>
+
+#include "WidthBuffer.h"
+
+_BWidthBuffer_::_BWidthBuffer_()
+{
+	//TODO: Implement
+}
+
+
+_BWidthBuffer_::~_BWidthBuffer_()
+{
+	//TODO: Implement
+}
+
+
+float
+_BWidthBuffer_::StringWidth(const char *inText, int32 fromOffset, int32 length,
+		const BFont *inStyle)
+{
+	// TODO: Should use local hashed items
+	return inStyle->StringWidth(inText + fromOffset, length);
+}
+
+
+float
+_BWidthBuffer_::StringWidth(_BTextGapBuffer_ &inBuffer, int32 fromOffset, int32 length,
+		const BFont *inStyle)
+{
+	return inStyle->StringWidth(inBuffer.Text() + fromOffset, length);
+}
+
+
+bool
+_BWidthBuffer_::FindTable(const BFont *inStyle, int32 *outIndex)
+{
+	float fontSize = inStyle->Size();
+	int32 fontCode = inStyle->FamilyAndStyle();
+
+	for (int32 i = 0; i < fItemCount; i++) {
+#if B_BEOS_VERSION_DANO
+		if (*inStyle == fBuffer[i].font) {
+#else
+		if (fontSize == fBuffer[i].fontSize && fontCode == fBuffer[i].fontCode) {
+#endif
+			*outIndex = i;
+			return true;
+		}
+	}
+	*outIndex = -1;
+	
+	return false;
+}
+
+
+int32
+_BWidthBuffer_::InsertTable(const BFont *font)
+{
+	//TODO: Implement
+	return B_ERROR;
+}
+
+
+bool 
+_BWidthBuffer_::GetEscapement(uint32 code, int32 index, float *escapement)
+{
+	//TODO: Implement
+	return false;
+}
+
+
+uint32
+_BWidthBuffer_::Hash(uint32 val)
+{
+	//TODO: Implement
+	return B_ERROR;
+}
+
+
+void
+_BWidthBuffer_::HashEscapements(const char *inText, int32 numChars, int32,
+		int32, const BFont *inStyle)
+{
+	//TODO: Implement
+}

src/kits/interface/BTextView/WidthBuffer.h

@@ -0,0 +1,43 @@
+#ifndef __WIDTHBUFFER_H
+#define __WIDTHBUFFER_H
+
+#include "TextGapBuffer.h"
+#include "TextViewSupportBuffer.h"
+
+
+struct _width_table_ {
+#if B_BEOS_VERSION_DANO
+	BFont font;				// corresponding font
+#else
+	int32 fontCode;			// font code
+	float fontSize;			// font size
+#endif
+	int32 hashCount;		// number of hashed items
+	int32 tableCount;		// size of table
+	void *widths;			// width table	
+};
+
+
+class _BWidthBuffer_ : public _BTextViewSupportBuffer_<_width_table_> {
+public:
+	_BWidthBuffer_();
+	virtual ~_BWidthBuffer_();
+
+	float StringWidth(const char *inText, int32 fromOffset, int32 length,
+		const BFont *inStyle);
+	float StringWidth(_BTextGapBuffer_ &, int32 fromOffset, int32 length,
+		const BFont *inStyle);
+
+private:
+	bool FindTable(const BFont *font, int32 *outIndex);
+	int32 InsertTable(const BFont *font);
+	
+	bool GetEscapement(uint32, int32, float *);
+	void HashEscapements(const char *, int32, int32, int32, const BFont *);
+	
+	uint32 Hash(uint32);
+	
+	void CCheck();
+};
+
+#endif // __WIDTHBUFFER_H