haiku-beta6/src/kits/interface/Button.cpp

/*
 *	Copyright (c) 2001-2005, Haiku.
 *
 *	Authors:
 *				Marc Flerackers ([email protected])
 *				Mike Wilber
 *				Stefano Ceccherini ([email protected])
 *				Ivan Tonizza
 */

#include <Button.h>
#include <Font.h>
#include <String.h>
#include <Window.h>

BButton::BButton(BRect frame, const char *name, const char *label, BMessage *message,
				  uint32 resizingMode, uint32 flags)
	:	BControl(frame, name, label, message, resizingMode, flags |= B_WILL_DRAW),
		fDrawAsDefault(false)
{
	// Resize to minimum height if needed
	font_height fh;
	GetFontHeight(&fh);
	float minHeight = 12.0f + (float)ceil(fh.ascent + fh.descent);
	if (Bounds().Height() < minHeight)
		ResizeTo(Bounds().Width(), minHeight);
}


BButton::~BButton()
{
}


BButton::BButton(BMessage *archive)
	:	BControl (archive)
{
	if (archive->FindBool("_default", &fDrawAsDefault) != B_OK)
		fDrawAsDefault = false;
}


BArchivable *
BButton::Instantiate(BMessage *archive)
{
	if (validate_instantiation(archive, "BButton"))
		return new BButton(archive);
	else
		return NULL;
}


status_t
BButton::Archive(BMessage* archive, bool deep) const
{
	status_t err = BControl::Archive(archive, deep);

	if (err != B_OK)
		return err;
	
	if (IsDefault())
		err = archive->AddBool("_default", true);

	return err;
}


void
BButton::Draw(BRect updateRect)
{
	font_height fh;
	GetFontHeight(&fh);
	
	const BRect bounds = Bounds();
	BRect rect = bounds;
	
	const bool enabled = IsEnabled();
	const bool pushed = Value() == B_CONTROL_ON;

	// Default indicator
	if (IsDefault())
		rect = DrawDefault(rect,enabled);
	else 
		rect.InsetBy(1.0f,1.0f);

	BRect fillArea = rect;
	fillArea.InsetBy(3.0f,3.0f);

	BString text = Label();
	
#if 1
	// Label truncation	
	BFont font;
	GetFont(&font);
	font.TruncateString(&text, B_TRUNCATE_END, fillArea.Width());
#endif

	// Label position
	const float stringWidth = StringWidth(text.String()); 	
	const float x = (bounds.right - stringWidth) / 2.0f;
	const float labelY = bounds.top  
		+ ((bounds.Height() - fh.ascent - fh.descent) / 2.0f) 
		+ fh.ascent +  1.0f;	
	const float focusLineY = labelY + fh.descent;

	/* speed trick:
	   if the focus changes but the button is not pressed then we can
	   redraw only the focus line, 
	   if the focus changes and the button is pressed invert the internal rect	
	   this block takes care of all the focus changes 	
	*/
	if (IsFocusChanging()) {	
		if (pushed) {
			rect.InsetBy(2.0,2.0);
			InvertRect(rect);
		} else 
			DrawFocusLine(x, focusLineY, stringWidth, IsFocus() && Window()->IsActive());
		
		return;
	}

	// Colors	
	const rgb_color panelBgColor = ui_color(B_PANEL_BACKGROUND_COLOR);
	const rgb_color buttonBgColor=tint_color(panelBgColor, B_LIGHTEN_1_TINT);	
	const rgb_color maxLightColor=tint_color(panelBgColor, B_LIGHTEN_MAX_TINT);	
	const rgb_color maxShadowColor=tint_color(panelBgColor, B_DARKEN_MAX_TINT);	
	const rgb_color darkBorderColor = tint_color(panelBgColor, 
		enabled ? B_DARKEN_4_TINT : B_DARKEN_2_TINT);
	const rgb_color firstBevelColor = enabled ? tint_color(panelBgColor, B_DARKEN_2_TINT) 
		: panelBgColor;
	const rgb_color cornerColor = IsDefault() ? firstBevelColor : panelBgColor;
	
	// Fill the button area
	SetHighColor(buttonBgColor);
	FillRect(fillArea);

	// external border
	SetHighColor(darkBorderColor);
	StrokeRect(rect);
		
	BeginLineArray(14);

	// Corners
	AddLine(rect.LeftTop(), rect.LeftTop(), cornerColor);
	AddLine(rect.LeftBottom(), rect.LeftBottom(), cornerColor);
	AddLine(rect.RightTop(), rect.RightTop(), cornerColor);
	AddLine(rect.RightBottom(), rect.RightBottom(), cornerColor);

	rect.InsetBy(1.0f,1.0f);
	
	// Shadow
	AddLine(rect.LeftBottom(), rect.RightBottom(), firstBevelColor);
	AddLine(rect.RightBottom(), rect.RightTop(), firstBevelColor);
	// Light
	AddLine(rect.LeftTop(), rect.LeftBottom(),buttonBgColor);
	AddLine(rect.LeftTop(), rect.RightTop(), buttonBgColor);	
	
	rect.InsetBy(1.0f, 1.0f);
	
	// Shadow
	AddLine(rect.LeftBottom(), rect.RightBottom(), panelBgColor);
	AddLine(rect.RightBottom(), rect.RightTop(), panelBgColor);
	// Light
	AddLine(rect.LeftTop(), rect.LeftBottom(),maxLightColor);
	AddLine(rect.LeftTop(), rect.RightTop(), maxLightColor);	
	
	rect.InsetBy(1.0f,1.0f);
	
	// Light
	AddLine(rect.LeftTop(), rect.LeftBottom(),maxLightColor);
	AddLine(rect.LeftTop(), rect.RightTop(), maxLightColor);	
		
	EndLineArray();	

	// Invert if clicked
	if (enabled && pushed) {
		rect.InsetBy(-2.0f,-2.0f);
		InvertRect(rect);
	}

	// Label color
	if (enabled) {
		if (pushed) {
			SetHighColor(maxLightColor);
			SetLowColor(maxShadowColor);
		} else {
			SetHighColor(maxShadowColor);	
			SetLowColor(tint_color(panelBgColor, B_LIGHTEN_2_TINT));
		}
	} else {
		SetHighColor(tint_color(panelBgColor, B_DISABLED_LABEL_TINT));
		SetLowColor(tint_color(panelBgColor, B_LIGHTEN_2_TINT));	
	}

	// Draw the label
	DrawString(text.String(), BPoint(x, labelY));

	// Focus line
	if (enabled && IsFocus() && Window()->IsActive() && !pushed)
		DrawFocusLine(x,focusLineY,stringWidth,true);
	
}


void
BButton::MouseDown(BPoint point)
{
	if (!IsEnabled())
		return;

	SetValue(B_CONTROL_ON);

	if (Window()->Flags() & B_ASYNCHRONOUS_CONTROLS) {
 		SetTracking(true);
 		SetMouseEventMask(B_POINTER_EVENTS, B_LOCK_WINDOW_FOCUS);
 	
 	} else {
		BRect bounds = Bounds();
		uint32 buttons;

		do {
			Window()->UpdateIfNeeded();
			
			snooze(40000);

			GetMouse(&point, &buttons, true);

 			bool inside = bounds.Contains(point);

			if ((Value() == B_CONTROL_ON) != inside)
				SetValue(inside ? B_CONTROL_ON : B_CONTROL_OFF);
		} while (buttons != 0);

		if (Value() == B_CONTROL_ON)
			Invoke();
	}
}


void
BButton::AttachedToWindow()
{
	BControl::AttachedToWindow();

	if (IsDefault())
		Window()->SetDefaultButton(this);
}


void
BButton::KeyDown(const char *bytes, int32 numBytes)
{
	if (*bytes == B_ENTER || *bytes == B_SPACE) {
		if (!IsEnabled())
			return;

		SetValue(B_CONTROL_ON);
		Invoke();
	
	} else
		BControl::KeyDown(bytes, numBytes);
}


void
BButton::MakeDefault(bool flag)
{
	BButton *oldDefault = NULL;
	BWindow *window = Window();
	
	if (window)
		oldDefault = window->DefaultButton();

	if (flag) {
		if (fDrawAsDefault && oldDefault == this)
			return;

		if (!fDrawAsDefault) {
			fDrawAsDefault = true;

			ResizeBy(6.0f, 6.0f);
			MoveBy(-3.0f, -3.0f);
		}

		if (window && oldDefault != this)
			window->SetDefaultButton(this);
	} else {
		if (!fDrawAsDefault)
			return;

		fDrawAsDefault = false;

		ResizeBy(-6.0f, -6.0f);
		MoveBy(3.0f, 3.0f);

		if (window && oldDefault == this)
			window->SetDefaultButton(NULL);
	}
}


void
BButton::SetLabel(const char *string)
{
	BControl::SetLabel(string);
}


bool
BButton::IsDefault() const
{
	return fDrawAsDefault;
}


void
BButton::MessageReceived(BMessage *message)
{
	BControl::MessageReceived(message);
}


void
BButton::WindowActivated(bool active)
{
	BControl::WindowActivated(active);
}


void
BButton::MouseMoved(BPoint point, uint32 transit, const BMessage *message)
{
	if (!IsTracking())
		return;

	bool inside = Bounds().Contains(point);

	if ((Value() == B_CONTROL_ON) != inside)
		SetValue(inside ? B_CONTROL_ON : B_CONTROL_OFF);
}


void
BButton::MouseUp(BPoint point)
{
	if (!IsTracking())
		return;

	if (Bounds().Contains(point))
		Invoke();
	
	SetTracking(false);
}


void
BButton::DetachedFromWindow()
{
	BControl::DetachedFromWindow();
}


void
BButton::SetValue(int32 value)
{
	if (value != Value()) {
		BControl::SetValue(value);
		Invalidate();
	}
}


void
BButton::GetPreferredSize(float *width, float *height)
{
	font_height fh;
	GetFontHeight(&fh);

	*height = 12.0f + (float)ceil(fh.ascent + fh.descent);
	*width = 20.0f + (float)ceil(StringWidth(Label()));
	
	if (*width < 75.0f)
		*width = 75.0f;

	if (fDrawAsDefault) {
		*width += 6.0f;
		*height += 6.0f;
	}
}


void
BButton::ResizeToPreferred()
{
	 BControl::ResizeToPreferred();
}


status_t
BButton::Invoke(BMessage *message)
{
	Sync();
	snooze(50000);
	
	status_t err = BControl::Invoke(message);

	SetValue(B_CONTROL_OFF);

	return err;
}


void
BButton::FrameMoved(BPoint newLocation)
{
	BControl::FrameMoved(newLocation);
}


void
BButton::FrameResized(float width, float height)
{
	BControl::FrameResized(width, height);
}


void
BButton::MakeFocus(bool focused)
{
	BControl::MakeFocus(focused);
}


void
BButton::AllAttached()
{
	BControl::AllAttached();
}


void
BButton::AllDetached()
{
	BControl::AllDetached();
}


BHandler *
BButton::ResolveSpecifier(BMessage *message, int32 index,
									BMessage *specifier, int32 what,
									const char *property)
{
	return BControl::ResolveSpecifier(message, index, specifier, what, property);
}


status_t
BButton::GetSupportedSuites(BMessage *message)
{
	return BControl::GetSupportedSuites(message);
}


status_t
BButton::Perform(perform_code d, void *arg)
{
	return BControl::Perform(d, arg);
}


void BButton::_ReservedButton1() {}
void BButton::_ReservedButton2() {}
void BButton::_ReservedButton3() {}


BButton &
BButton::operator=(const BButton &)
{
	return *this;
}


BRect
BButton::DrawDefault(BRect bounds, bool enabled)
{
	rgb_color no_tint = ui_color(B_PANEL_BACKGROUND_COLOR),
	lighten1 = tint_color(no_tint, B_LIGHTEN_1_TINT),
	darken1 = tint_color(no_tint, B_DARKEN_1_TINT);
	
	rgb_color borderColor;
	if (enabled)
		borderColor = tint_color(no_tint, B_DARKEN_4_TINT);
	else
		borderColor = darken1;

	// Dark border
	BeginLineArray(4);
	AddLine(BPoint(bounds.left, bounds.bottom - 1.0f),
		BPoint(bounds.left, bounds.top + 1.0f), borderColor);
	AddLine(BPoint(bounds.left + 1.0f, bounds.top),
		BPoint(bounds.right - 1.0f, bounds.top), borderColor);
	AddLine(BPoint(bounds.right, bounds.top + 1.0f),
		BPoint(bounds.right, bounds.bottom - 1.0f), borderColor);
	AddLine(BPoint(bounds.left + 1.0f, bounds.bottom),
		BPoint(bounds.right - 1.0f, bounds.bottom), borderColor);
	EndLineArray();

	if (enabled) {
		// Bevel
		bounds.InsetBy(1.0f, 1.0f);
		SetHighColor(darken1);
		StrokeRect(bounds);
	}

	bounds.InsetBy(1.0f, 1.0f);

	// Filling
	float inset = enabled? 2.0f : 3.0f;
	SetHighColor(lighten1);

	FillRect(BRect(bounds.left, bounds.top, 
		bounds.right, bounds.top+inset-1.0f));
	FillRect(BRect(bounds.left, bounds.bottom-inset+1.0f, 
		bounds.right, bounds.bottom));
	FillRect(BRect(bounds.left, bounds.top+inset-1.0f,
		bounds.left+inset-1.0f, bounds.bottom-inset+1.0f));
	FillRect(BRect(bounds.right-inset+1.0f, bounds.top+inset-1.0f,
		bounds.right, bounds.bottom-inset+1.0f));

	bounds.InsetBy(inset,inset);

	return bounds;
}


status_t
BButton::Execute()
{
	if (!IsEnabled())
		return B_ERROR;

	SetValue(B_CONTROL_ON);
	return Invoke();
}


void
BButton::DrawFocusLine(float x, float y, float width, bool visible)
{
	if (visible)
		SetHighColor(ui_color(B_KEYBOARD_NAVIGATION_COLOR));
	else
		SetHighColor(tint_color(ui_color(B_PANEL_BACKGROUND_COLOR),
			B_LIGHTEN_1_TINT));
	// Blue Line
	StrokeLine(BPoint(x, y), BPoint(x + width, y));

	if (visible)		
		SetHighColor(255, 255, 255);
	// White Line
	StrokeLine(BPoint(x, y + 1.0f), BPoint(x + width, y + 1.0f));
}