haiku/src/servers/app/DefaultDecorator.cpp

//------------------------------------------------------------------------------
//	Copyright (c) 2001-2002, Haiku, Inc.
//
//	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:		DefaultDecorator.cpp
//	Author:			DarkWyrm <bpmagic@columbus.rr.com>
//	Description:	Default and fallback decorator for the app_server
//
//------------------------------------------------------------------------------

#include <stdio.h>

#include <Rect.h>
#include <View.h>

#include "ColorUtils.h"
#include "DisplayDriver.h"
#include "FontServer.h"
#include "LayerData.h"
#include "PatternHandler.h"
#include "RGBColor.h"

#include "DefaultDecorator.h"

//#define USE_VIEW_FILL_HACK

//#define DEBUG_DECORATOR
#ifdef DEBUG_DECORATOR
#	include <stdio.h>
#	define STRACE(x) printf x
#else
#	define STRACE(x) ;
#endif

DefaultDecorator::DefaultDecorator(BRect rect, int32 wlook, int32 wfeel, int32 wflags)
	: Decorator(rect, wlook, wfeel, wflags),
	  fTruncatedTitle("")
{
	ServerFont font(_look == B_FLOATING_WINDOW_LOOK ? *fontserver->GetSystemPlain() : *fontserver->GetSystemBold());
	font.SetFlags(B_FORCE_ANTIALIASING);
	font.SetSpacing(B_STRING_SPACING);
	SetFont(&font);

	fFrameColors = new RGBColor[6];
	fFrameColors[0].SetColor(152, 152, 152);
	fFrameColors[1].SetColor(255, 255, 255);
	fFrameColors[2].SetColor(216, 216, 216);
	fFrameColors[3].SetColor(136, 136, 136);
	fFrameColors[4].SetColor(152, 152, 152);
	fFrameColors[5].SetColor(96, 96, 96);
	
	// Set appropriate colors based on the current focus value. In this case, each decorator
	// defaults to not having the focus.
	_SetFocus();

	// Do initial decorator setup
	_DoLayout();

	STRACE(("DefaultDecorator:\n"));
	STRACE(("\tFrame (%.1f,%.1f,%.1f,%.1f)\n",rect.left,rect.top,rect.right,rect.bottom));
}

DefaultDecorator::~DefaultDecorator(void)
{
	STRACE(("DefaultDecorator: ~DefaultDecorator()\n"));
	delete [] fFrameColors;
}

void
DefaultDecorator::MoveBy(float x, float y)
{
	MoveBy(BPoint(x,y));
}

void
DefaultDecorator::MoveBy(BPoint pt)
{
	STRACE(("DefaultDecorator: Move By (%.1f, %.1f)\n",pt.x,pt.y));
	// Move all internal rectangles the appropriate amount
	_frame.OffsetBy(pt);
	_closerect.OffsetBy(pt);
	_tabrect.OffsetBy(pt);
	_resizerect.OffsetBy(pt);
	_zoomrect.OffsetBy(pt);
	_borderrect.OffsetBy(pt);
	
	fLeftBorder.OffsetBy(pt);
	fRightBorder.OffsetBy(pt);
	fTopBorder.OffsetBy(pt);
	fBottomBorder.OffsetBy(pt);
}

void
DefaultDecorator::ResizeBy(float x, float y)
{
	ResizeBy(BPoint(x,y));
}

void
DefaultDecorator::ResizeBy(BPoint pt)
{
	STRACE(("DefaultDecorator: Resize By (%.1f, %.1f)\n",pt.x,pt.y));
	// Move all internal rectangles the appropriate amount
	_frame.right		+= pt.x;
	_frame.bottom		+= pt.y;

	_resizerect.OffsetBy(pt);
	_borderrect.right	+= pt.x;
	_borderrect.bottom	+= pt.y;
	
	fLeftBorder.bottom	+= pt.y;
	fTopBorder.right	+= pt.x;

	fRightBorder.OffsetBy(pt.x, 0.0);
	fRightBorder.bottom	+= pt.y;
	
	fBottomBorder.OffsetBy(0.0, pt.y);
	fBottomBorder.right	+= pt.x;

	// resize tab and layout tab items
	if (_tabrect.IsValid()) {
		float tabWidth = fRightBorder.right - fLeftBorder.left;
	
		if (tabWidth < fMinTabWidth)
			tabWidth = fMinTabWidth;
		if (tabWidth > fMaxTabWidth)
			tabWidth = fMaxTabWidth;
	
		if (tabWidth != _tabrect.Width()) {
			_tabrect.right = _tabrect.left + tabWidth;
			_LayoutTabItems(_tabrect);
		}
	}
}

// Draw
void
DefaultDecorator::Draw(BRect update)
{
	STRACE(("DefaultDecorator: Draw(%.1f,%.1f,%.1f,%.1f)\n",update.left,update.top,update.right,update.bottom));

	// We need to draw a few things: the tab, the resize thumb, the borders,
	// and the buttons

	_DrawFrame(update);
	_DrawTab(update);
}

// Draw
void
DefaultDecorator::Draw()
{
	// Easy way to draw everything - no worries about drawing only certain
	// things

	_DrawFrame(BRect(fTopBorder.LeftTop(), fBottomBorder.RightBottom()));
	_DrawTab(_tabrect);
}

// GetSizeLimits
void
DefaultDecorator::GetSizeLimits(float* minWidth, float* minHeight,
								float* maxWidth, float* maxHeight) const
{
	if (_tabrect.IsValid())
		*minWidth = max_c(*minWidth, fMinTabWidth);
	if (_resizerect.IsValid())
		*minHeight = max_c(*minHeight, _resizerect.Height() - fBorderWidth);
}

// GetFootprint
void
DefaultDecorator::GetFootprint(BRegion *region)
{
	STRACE(("DefaultDecorator: Get Footprint\n"));
	// This function calculates the decorator's footprint in coordinates
	// relative to the layer. This is most often used to set a WinBorder
	// object's visible region.
	if (!region)
		return;

	region->MakeEmpty();

	if (_look == B_NO_BORDER_WINDOW_LOOK)
		return;

	region->Include(fLeftBorder);
	region->Include(fRightBorder);
	region->Include(fTopBorder);
	region->Include(fBottomBorder);
	
	if (_look == B_BORDERED_WINDOW_LOOK)
		return;

	region->Include(_tabrect);

	if (_look == B_DOCUMENT_WINDOW_LOOK) {
		// include the rectangular resize knob on the bottom right
		region->Include(BRect(_frame.right - 13.0f, _frame.bottom - 13.0f,
							  _frame.right, _frame.bottom));
	}
}

click_type
DefaultDecorator::Clicked(BPoint pt, int32 buttons, int32 modifiers)
{
#ifdef DEBUG_DECORATOR
	printf("DefaultDecorator: Clicked\n");
	printf("\tPoint: (%.1f,%.1f)\n",pt.x,pt.y);
	printf("\tButtons:\n");

	if (buttons == 0) {
		printf("\t\tNone\n");
	} else {
		if(buttons & B_PRIMARY_MOUSE_BUTTON)
			printf("\t\tPrimary\n");
		if(buttons & B_SECONDARY_MOUSE_BUTTON)
			printf("\t\tSecondary\n");
		if(buttons & B_TERTIARY_MOUSE_BUTTON)
			printf("\t\tTertiary\n");
	}

	printf("\tModifiers:\n");

	if (modifiers == 0) {
		printf("\t\tNone\n");
	} else {
		if(modifiers & B_CAPS_LOCK)
			printf("\t\tCaps Lock\n");
		if(modifiers & B_NUM_LOCK)
			printf("\t\tNum Lock\n");
		if(modifiers & B_SCROLL_LOCK)
			printf("\t\tScroll Lock\n");
		if(modifiers & B_LEFT_COMMAND_KEY)
			printf("\t\t Left Command\n");
		if(modifiers & B_RIGHT_COMMAND_KEY)
			printf("\t\t Right Command\n");
		if(modifiers & B_LEFT_CONTROL_KEY)
			printf("\t\tLeft Control\n");
		if(modifiers & B_RIGHT_CONTROL_KEY)
			printf("\t\tRight Control\n");
		if(modifiers & B_LEFT_OPTION_KEY)
			printf("\t\tLeft Option\n");
		if(modifiers & B_RIGHT_OPTION_KEY)
			printf("\t\tRight Option\n");
		if(modifiers & B_LEFT_SHIFT_KEY)
			printf("\t\tLeft Shift\n");
		if(modifiers & B_RIGHT_SHIFT_KEY)
			printf("\t\tRight Shift\n");
		if(modifiers & B_MENU_KEY)
			printf("\t\tMenu\n");
	}
#endif // DEBUG_DECORATOR
	
	// In checking for hit test stuff, we start with the smallest rectangles the user might
	// be clicking on and gradually work our way out into larger rectangles.
	if (!(_flags & B_NOT_CLOSABLE) && _closerect.Contains(pt))
		return DEC_CLOSE;

	if (!(_flags & B_NOT_ZOOMABLE) && _zoomrect.Contains(pt))
		return DEC_ZOOM;
	
	if (_look == B_DOCUMENT_WINDOW_LOOK && _resizerect.Contains(pt))
		return DEC_RESIZE;

	// Clicking in the tab?
	if (_tabrect.Contains(pt)) {
		// tab sliding in any case if either shift key is held down
		if (modifiers & B_SHIFT_KEY)
			return DEC_SLIDETAB;
		// Here's part of our window management stuff
		if (buttons == B_SECONDARY_MOUSE_BUTTON)
			return DEC_MOVETOBACK;
		return DEC_DRAG;
	}

	// We got this far, so user is clicking on the border?
	if (fLeftBorder.Contains(pt) || fRightBorder.Contains(pt)
		|| fTopBorder.Contains(pt) || fBottomBorder.Contains(pt)) {
		// check resize area
		if (!(_flags & B_NOT_RESIZABLE) &&
			(_look == B_TITLED_WINDOW_LOOK || _look == B_FLOATING_WINDOW_LOOK)) {

			BRect temp(BPoint(fBottomBorder.right - 18, fBottomBorder.bottom - 18),
					   fBottomBorder.RightBottom());
			if (temp.Contains(pt))
				return DEC_RESIZE;
		}
		// NOTE: On R5, windows are not moved to back if clicked inside the resize area with
		// the second mouse button. So we check this after the check above
		if (buttons == B_SECONDARY_MOUSE_BUTTON)
			return DEC_MOVETOBACK;

		return DEC_DRAG;
	}

	// Guess user didn't click anything
	return DEC_NONE;
}

void
DefaultDecorator::_DoLayout()
{
	STRACE(("DefaultDecorator: Do Layout\n"));
	// Here we determine the size of every rectangle that we use
	// internally when we are given the size of the client rectangle.

	bool hasTab = false;

	switch (GetLook()) {
		case B_MODAL_WINDOW_LOOK:
			fBorderWidth = 5;
			break;

		case B_TITLED_WINDOW_LOOK:
		case B_DOCUMENT_WINDOW_LOOK:
			hasTab = true;
			fBorderWidth = 5;
			break;
		case B_FLOATING_WINDOW_LOOK:
			hasTab = true;
			fBorderWidth = 3;
			break;

		case B_BORDERED_WINDOW_LOOK:
			fBorderWidth = 1;
			break;

		default:
			fBorderWidth = 0;
	}
	
	// calculate our tab rect
	if (hasTab) {
		// tab is initially on the left
		fTabOffset = 0;
		// distance from one item of the tab bar to another.
		// In this case the text and close/zoom rects
		fTextOffset = (_look == B_FLOATING_WINDOW_LOOK) ? 12 : 20;

		font_height fh;
		_drawdata.Font().Height(&fh);

		_tabrect.Set(_frame.left - fBorderWidth,
					 _frame.top - fBorderWidth - ceilf(fh.ascent + fh.descent + 7.0),
					 ((_frame.right - _frame.left) < 35.0 ?
					 _frame.left + 35.0 : _frame.right) + fBorderWidth,
					 _frame.top - fBorderWidth);

		// format tab rect for a floating window - make the rect smaller
		if (_look == B_FLOATING_WINDOW_LOOK) {
			_tabrect.InsetBy(0, 2);
			_tabrect.OffsetBy(0, 2);
		}

		float offset;
		float size;
		_GetButtonSizeAndOffset(_tabrect, &offset, &size);

		// fMinTabWidth contains just the room for the buttons
		fMinTabWidth = 4.0 + fTextOffset;
		if (!(_flags & B_NOT_CLOSABLE))
			fMinTabWidth += offset + size;
		if (!(_flags & B_NOT_ZOOMABLE))
			fMinTabWidth += offset + size;

		// fMaxTabWidth contains fMinWidth + the width required for the title
		fMaxTabWidth = _driver ? _driver->StringWidth(GetTitle(), strlen(GetTitle()),
			&_drawdata) : 0.0;
		if (fMaxTabWidth > 0.0)
			fMaxTabWidth += fTextOffset;
		fMaxTabWidth += fMinTabWidth;

		float tabWidth = _frame.Width();
		if (tabWidth < fMinTabWidth)
			tabWidth = fMinTabWidth;
		if (tabWidth > fMaxTabWidth)
			tabWidth = fMaxTabWidth;

		// layout buttons and truncate text
		_tabrect.right = _tabrect.left + tabWidth;
		_LayoutTabItems(_tabrect);
	} else {
		// no tab
		fMinTabWidth = 0.0;
		fMaxTabWidth = 0.0;
		_tabrect.Set(0.0, 0.0, -1.0, -1.0);
		_closerect.Set(0.0, 0.0, -1.0, -1.0);
		_zoomrect.Set(0.0, 0.0, -1.0, -1.0);
	}

	// calculate left/top/right/bottom borders
	if (fBorderWidth > 0) {
		fLeftBorder.Set(_frame.left - fBorderWidth, _frame.top,
			_frame.left - 1, _frame.bottom);

		fRightBorder.Set(_frame.right + 1, _frame.top ,
			_frame.right + fBorderWidth, _frame.bottom);

		fTopBorder.Set(_frame.left - fBorderWidth, _frame.top - fBorderWidth,
			_frame.right + fBorderWidth, _frame.top - 1);

		fBottomBorder.Set(_frame.left - fBorderWidth, _frame.bottom + 1,
			_frame.right + fBorderWidth, _frame.bottom + fBorderWidth);
	} else {
		// no border ... (?) useful when displaying windows that are just images
		fLeftBorder.Set(0.0, 0.0, -1.0, -1.0);
		fRightBorder.Set(0.0, 0.0, -1.0, -1.0);
		fTopBorder.Set(0.0, 0.0, -1.0, -1.0);
		fBottomBorder.Set(0.0, 0.0, -1.0, -1.0);
	}

	// calculate resize rect
	_resizerect.Set(fBottomBorder.right - 18.0, fBottomBorder.bottom - 18.0,
					fBottomBorder.right - 3, fBottomBorder.bottom - 3);
}

// _DrawFrame
void
DefaultDecorator::_DrawFrame(BRect invalid)
{
STRACE(("_DrawFrame(%f,%f,%f,%f)\n", invalid.left, invalid.top,
									 invalid.right, invalid.bottom));

	#ifdef USE_VIEW_FILL_HACK
		_drawdata.SetHighColor(RGBColor(192, 192, 192 ));	
		_driver->FillRect(_frame, _drawdata.HighColor());
	#endif

	if (_look == B_NO_BORDER_WINDOW_LOOK)
		return;

	if (fBorderWidth <= 0)
		return;

	// Draw the border frame
	BRect r = BRect(fTopBorder.LeftTop(), fBottomBorder.RightBottom());
	switch (_look) {
		case B_TITLED_WINDOW_LOOK:
		case B_DOCUMENT_WINDOW_LOOK:
		case B_MODAL_WINDOW_LOOK: {
			//top
			for (int8 i = 0; i < 5; i++) {
				_driver->StrokeLine(BPoint(r.left + i, r.top + i),
									BPoint(r.right - i, r.top + i),
									fFrameColors[i]);
			}
			//left
			for (int8 i = 0; i < 5; i++) {
				_driver->StrokeLine(BPoint(r.left + i, r.top + i),
									BPoint(r.left + i, r.bottom - i),
									fFrameColors[i]);
			}
			//bottom
			for (int8 i = 0; i < 5; i++) {
				_driver->StrokeLine(BPoint(r.left + i, r.bottom - i),
									BPoint(r.right - i, r.bottom - i),
									fFrameColors[(4 - i) == 4 ? 5 : (4 - i)]);
			}
			//right
			for (int8 i = 0; i < 5; i++) {
				_driver->StrokeLine(BPoint(r.right - i, r.top + i),
									BPoint(r.right - i, r.bottom - i),
									fFrameColors[(4 - i) == 4 ? 5 : (4 - i)]);
			}
			break;
		}
		case B_FLOATING_WINDOW_LOOK: {
			//top
			for (int8 i = 0; i < 3; i++) {
				_driver->StrokeLine(BPoint(r.left + i, r.top + i),
									BPoint(r.right - i, r.top + i),
									fFrameColors[i * 2]);
			}
			//left
			for (int8 i = 0; i < 3; i++) {
				_driver->StrokeLine(BPoint(r.left + i, r.top + i),
									BPoint(r.left + i, r.bottom - i),
									fFrameColors[i * 2]);
			}
			//bottom
			for (int8 i = 0; i < 3; i++) {
				_driver->StrokeLine(BPoint(r.left + i, r.bottom - i),
									BPoint(r.right - i, r.bottom - i),
									fFrameColors[(2 - i) == 2 ? 5 : (2 - i) * 2]);
			}
			//right
			for (int8 i = 0; i < 3; i++) {
				_driver->StrokeLine(BPoint(r.right - i, r.top + i),
									BPoint(r.right - i, r.bottom - i),
									fFrameColors[(2 - i) == 2 ? 5 : (2 - i) * 2]);
			}
			break;
			break;
		}
		case B_BORDERED_WINDOW_LOOK: {
			_driver->StrokeRect(r, fFrameColors[0]);
			break;
		}

		default:
			// don't draw a border frame
			break;
	}

	// Draw the resize thumb if we're supposed to
	if (!(_flags & B_NOT_RESIZABLE)) {

		r = _resizerect;

		switch (_look){
			case B_DOCUMENT_WINDOW_LOOK: {

				// Explicitly locking the driver is normally unnecessary. However, we need to do
				// this because we are rapidly drawing a series of calls which would not necessarily
				// draw correctly if we didn't do so.
				float	x = r.right;
				float	y = r.bottom;
				_driver->Lock();
				_driver->FillRect(BRect(x-13, y-13, x, y), fFrameColors[2]);
				_driver->StrokeLine(BPoint(x-15, y-15), BPoint(x-15, y-2), fFrameColors[0]);
				_driver->StrokeLine(BPoint(x-14, y-14), BPoint(x-14, y-1), fFrameColors[1]);
				_driver->StrokeLine(BPoint(x-15, y-15), BPoint(x-2, y-15), fFrameColors[0]);
				_driver->StrokeLine(BPoint(x-14, y-14), BPoint(x-1, y-14), fFrameColors[1]);

				for (int8 i = 1; i <= 4; i++) {
					for (int8 j = 1; j <= i; j++) {
						BPoint		pt1(x-(3*j)+1, y-(3*(5-i))+1);
						BPoint		pt2(x-(3*j)+2, y-(3*(5-i))+2);
						_driver->StrokePoint(pt1, fFrameColors[0]);
						_driver->StrokePoint(pt2, fFrameColors[1]);
					}
				}
				_driver->Unlock();
				break;
			}

			case B_TITLED_WINDOW_LOOK:
			case B_FLOATING_WINDOW_LOOK:
			case B_MODAL_WINDOW_LOOK: {
				_driver->StrokeLine(BPoint(fRightBorder.left, fBottomBorder.bottom - 22),
									BPoint(fRightBorder.right - 1, fBottomBorder.bottom - 22),
									fFrameColors[0]);
				_driver->StrokeLine(BPoint(fRightBorder.right - 22, fBottomBorder.top),
									BPoint(fRightBorder.right - 22, fBottomBorder.bottom - 1),
									fFrameColors[0]);
				break;
			}
			
			default: {
				// don't draw resize corner
				break;
			}
		}
	}
}

// _DrawTab
void
DefaultDecorator::_DrawTab(BRect r)
{
	STRACE(("_DrawTab(%f,%f,%f,%f)\n", r.left, r.top, r.right, r.bottom));
	// If a window has a tab, this will draw it and any buttons which are
	// in it.
	if (!_tabrect.IsValid())
		return;

	// TODO: cache these
	RGBColor tabColorLight = RGBColor(tint_color(fTabColor.GetColor32(), (B_LIGHTEN_2_TINT + B_LIGHTEN_MAX_TINT) / 2));
	RGBColor tabColorShadow = RGBColor(tint_color(fTabColor.GetColor32(), B_DARKEN_2_TINT));

	// outer frame
	_driver->StrokeLine(_tabrect.LeftTop(), _tabrect.LeftBottom(), fFrameColors[0]);
	_driver->StrokeLine(_tabrect.LeftTop(), _tabrect.RightTop(), fFrameColors[0]);
	_driver->StrokeLine(_tabrect.RightTop(),_tabrect.RightBottom(), fFrameColors[5]);

	// grey along the bottom (overwrites "white" from frame)
	_driver->StrokeLine(BPoint(_tabrect.left + 2, _tabrect.bottom + 1),
						BPoint(_tabrect.right - 2, _tabrect.bottom + 1),
						fFrameColors[2]);

	// bevel
	_driver->StrokeLine(BPoint(_tabrect.left + 1, _tabrect.top + 1),
						BPoint(_tabrect.left + 1, _tabrect.bottom),
						tabColorLight);
	_driver->StrokeLine(BPoint(_tabrect.left + 1, _tabrect.top + 1),
						BPoint(_tabrect.right - 1, _tabrect.top + 1),
						tabColorLight);

	_driver->StrokeLine(BPoint(_tabrect.right - 1, _tabrect.top + 2),
						BPoint(_tabrect.right - 1, _tabrect.bottom),
						tabColorShadow);

	// fill
	_driver->FillRect(BRect(_tabrect.left + 2, _tabrect.top + 2,
							_tabrect.right - 2, _tabrect.bottom), fTabColor);

	_DrawTitle(_tabrect);

	// Draw the buttons if we're supposed to	
	if (!(_flags & B_NOT_CLOSABLE))
		_DrawClose(_closerect);
	if (!(_flags & B_NOT_ZOOMABLE))
		_DrawZoom(_zoomrect);
}

// _DrawClose
void
DefaultDecorator::_DrawClose(BRect r)
{
	STRACE(("_DrawClose(%f,%f,%f,%f)\n", r.left, r.top, r.right, r.bottom));
	// Just like DrawZoom, but for a close button
	_DrawBlendedRect( r, GetClose());
}

// _DrawTitle
void
DefaultDecorator::_DrawTitle(BRect r)
{
	STRACE(("_DrawTitle(%f,%f,%f,%f)\n", r.left, r.top, r.right, r.bottom));

	_drawdata.SetHighColor(fTextColor);
	_drawdata.SetLowColor(fTabColor);

	// figure out position of text
	font_height fh;
	_drawdata.Font().Height(&fh);

	BPoint titlePos;
	titlePos.x = _closerect.IsValid() ? _closerect.right + fTextOffset : _tabrect.left + fTextOffset;
	titlePos.y = floorf(((_tabrect.top + 2.0) + _tabrect.bottom + fh.ascent + fh.descent) / 2.0 - fh.descent + 0.5);
	
	_driver->DrawString(fTruncatedTitle.String(), fTruncatedTitleLength, titlePos, &_drawdata);
}

// _DrawZoom
void
DefaultDecorator::_DrawZoom(BRect r)
{
	STRACE(("_DrawZoom(%f,%f,%f,%f)\n", r.left, r.top, r.right, r.bottom));
	// If this has been implemented, then the decorator has a Zoom button
	// which should be drawn based on the state of the member zoomstate

	BRect zr(r);
	zr.left += 3.0;
	zr.top += 3.0;
	_DrawBlendedRect(zr, GetZoom());

	zr = r;
	zr.right -= 5.0;
	zr.bottom -= 5.0;
	_DrawBlendedRect(zr, GetZoom());
}

// _SetFocus
void
DefaultDecorator::_SetFocus()
{
	// SetFocus() performs necessary duties for color swapping and
	// other things when a window is deactivated or activated.
	
	if (GetFocus()) {
		fButtonHighColor.SetColor(tint_color(_colors->window_tab,B_LIGHTEN_2_TINT));
		fButtonLowColor.SetColor(tint_color(_colors->window_tab,B_DARKEN_1_TINT));
		fTextColor = _colors->window_tab_text;
		fTabColor = _colors->window_tab;
	} else {
		fButtonHighColor.SetColor(tint_color(_colors->inactive_window_tab,B_LIGHTEN_2_TINT));
		fButtonLowColor.SetColor(tint_color(_colors->inactive_window_tab,B_DARKEN_1_TINT));
		fTextColor = _colors->inactive_window_tab_text;
		fTabColor = _colors->inactive_window_tab;
	}
}

// _SetColors
void
DefaultDecorator::_SetColors()
{
	_SetFocus();
}

// _DrawBlendedRect
void
DefaultDecorator::_DrawBlendedRect(BRect r, bool down)
{
	// This bad boy is used to draw a rectangle with a gradient.
	// Note that it is not part of the Decorator API - it's specific
	// to just the BeDecorator. Called by DrawZoom and DrawClose

	// Actually just draws a blended square
	int32 w = r.IntegerWidth();
	int32 h = r.IntegerHeight();
	
	RGBColor temprgbcol;
	rgb_color halfcol, startcol, endcol;
	float rstep, gstep, bstep;

	int steps = (w < h) ? w : h;

	if (down) {
		startcol	= fButtonLowColor.GetColor32();
		endcol		= fButtonHighColor.GetColor32();
	} else {
		startcol	= fButtonHighColor.GetColor32();
		endcol		= fButtonLowColor.GetColor32();
	}

	halfcol = MakeBlendColor(startcol,endcol,0.5);

	rstep = float(startcol.red - halfcol.red) / steps;
	gstep = float(startcol.green - halfcol.green) / steps;
	bstep = float(startcol.blue - halfcol.blue) / steps;

	for (int32 i = 0; i <= steps; i++) {
		temprgbcol.SetColor(uint8(startcol.red - (i * rstep)),
							uint8(startcol.green - (i * gstep)),
							uint8(startcol.blue - (i * bstep)));
		
		_driver->StrokeLine(BPoint(r.left, r.top + i),
							BPoint(r.left + i, r.top), temprgbcol);

		temprgbcol.SetColor(uint8(halfcol.red - (i * rstep)),
							uint8(halfcol.green - (i * gstep)),
							uint8(halfcol.blue - (i * bstep)));

		_driver->StrokeLine(BPoint(r.left + steps, r.top + i),
							BPoint(r.left + i, r.top + steps), temprgbcol);
	}
	_driver->StrokeRect(r, fFrameColors[3]);
}

// _GetButtonSizeAndOffset
void
DefaultDecorator::_GetButtonSizeAndOffset(const BRect& tabRect, float* offset, float* size) const
{
	*offset = _look == B_FLOATING_WINDOW_LOOK ? 4.0 : 5.0;
	// "+ 2" so that the rects are centered within the solid area
	// (without the 2 pixels for the top border)
	*size = tabRect.Height() - 2.0 * *offset + 2.0;
}

// _LayoutTabItems
void
DefaultDecorator::_LayoutTabItems(const BRect& tabRect)
{
	float offset;
	float size;
	_GetButtonSizeAndOffset(tabRect, &offset, &size);

	// calulate close rect based on the tab rectangle
	if (GetFlags() & B_NOT_CLOSABLE) {
		_closerect.Set(tabRect.left + offset, tabRect.top + offset,
			tabRect.left + offset, tabRect.top + offset + size);
	} else {
		_closerect.Set(tabRect.left + offset, tabRect.top + offset,
			tabRect.left + offset + size, tabRect.top + offset + size);
	}

	// calulate zoom rect based on the tab rectangle
	if (GetFlags() & B_NOT_ZOOMABLE) {
		_zoomrect.Set(tabRect.right, tabRect.top + offset,
			tabRect.right, tabRect.top + offset + size);
	} else {
		_zoomrect.Set(tabRect.right - offset - size, tabRect.top + offset,
			tabRect.right - offset, tabRect.top + offset + size);
	}

	// calculate room for title
	// ToDo: the +2 is there because the title often appeared
	//	truncated for no apparent reason - OTOH the title does
	//	also not appear perfectly in the middle
	float width = (_zoomrect.left - _closerect.right) - fTextOffset * 2 + 2;
	fTruncatedTitle = GetTitle();
	_drawdata.Font().TruncateString(&fTruncatedTitle, B_TRUNCATE_END, width);
	fTruncatedTitleLength = fTruncatedTitle.Length();
}