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/*
* Copyright (c) 2008, 2009, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ScrollbarThemeChromiumLinux.h"
#include "PlatformContextSkia.h"
#include "PlatformMouseEvent.h"
#include "PlatformThemeChromiumGtk.h"
#include "Scrollbar.h"
#include "TransformationMatrix.h"
namespace WebCore {
static const int scrollbarThicknessValue = 15;
static const int buttonLength = 14;
ScrollbarTheme* ScrollbarTheme::nativeTheme()
{
static ScrollbarThemeChromiumLinux theme;
return &theme;
}
int ScrollbarThemeChromiumLinux::scrollbarThickness(ScrollbarControlSize controlSize)
{
return scrollbarThicknessValue;
}
static void drawVertLine(SkCanvas* canvas, int x, int y1, int y2, const SkPaint& paint)
{
SkIRect skrect;
skrect.set(x, y1, x + 1, y2 + 1);
canvas->drawIRect(skrect, paint);
}
static void drawHorizLine(SkCanvas* canvas, int x1, int x2, int y, const SkPaint& paint)
{
SkIRect skrect;
skrect.set(x1, y, x2 + 1, y + 1);
canvas->drawIRect(skrect, paint);
}
static void drawBox(SkCanvas* canvas, const IntRect& rect, const SkPaint& paint)
{
const int right = rect.x() + rect.width() - 1;
const int bottom = rect.y() + rect.height() - 1;
drawHorizLine(canvas, rect.x(), right, rect.y(), paint);
drawVertLine(canvas, right, rect.y(), bottom, paint);
drawHorizLine(canvas, rect.x(), right, bottom, paint);
drawVertLine(canvas, rect.x(), rect.y(), bottom, paint);
}
void ScrollbarThemeChromiumLinux::paintTrackPiece(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart partType)
{
SkCanvas* const canvas = gc->platformContext()->canvas();
SkPaint paint;
SkIRect skrect;
skrect.set(rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height());
SkScalar trackHSV[3];
SkColorToHSV(PlatformThemeChromiumGtk::trackColor(), trackHSV);
paint.setColor(PlatformThemeChromiumGtk::saturateAndBrighten(trackHSV, 0, 0));
canvas->drawIRect(skrect, paint);
SkScalar thumbHSV[3];
SkColorToHSV(PlatformThemeChromiumGtk::thumbInactiveColor(),
thumbHSV);
paint.setColor(PlatformThemeChromiumGtk::outlineColor(trackHSV, thumbHSV));
drawBox(canvas, rect, paint);
}
void ScrollbarThemeChromiumLinux::paintButton(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
{
PlatformThemeChromiumGtk::ArrowDirection direction;
if (scrollbar->orientation() == HorizontalScrollbar) {
if (part == BackButtonStartPart)
direction = PlatformThemeChromiumGtk::West;
else
direction = PlatformThemeChromiumGtk::East;
} else {
if (part == BackButtonStartPart)
direction = PlatformThemeChromiumGtk::North;
else
direction = PlatformThemeChromiumGtk::South;
}
ControlStates states = 0;
// Determine if the button can be pressed.
if (((direction == PlatformThemeChromiumGtk::West || direction == PlatformThemeChromiumGtk::North) && scrollbar->currentPos())
|| (direction == PlatformThemeChromiumGtk::East || direction == PlatformThemeChromiumGtk::South) && scrollbar->currentPos() != scrollbar->maximum())
states |= EnabledState;
if (states & EnabledState) {
if (part == scrollbar->pressedPart())
states |= PressedState;
else if (part == scrollbar->hoveredPart())
states |= HoverState;
}
PlatformThemeChromiumGtk::paintArrowButton(gc, rect, direction, states);
}
void ScrollbarThemeChromiumLinux::paintThumb(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect)
{
const bool hovered = scrollbar->hoveredPart() == ThumbPart;
const int midx = rect.x() + rect.width() / 2;
const int midy = rect.y() + rect.height() / 2;
const bool vertical = scrollbar->orientation() == VerticalScrollbar;
SkCanvas* const canvas = gc->platformContext()->canvas();
SkScalar thumb[3];
SkColorToHSV(hovered
? PlatformThemeChromiumGtk::thumbActiveColor()
: PlatformThemeChromiumGtk::thumbInactiveColor(),
thumb);
SkPaint paint;
paint.setColor(PlatformThemeChromiumGtk::saturateAndBrighten(thumb, 0, 0.02));
SkIRect skrect;
if (vertical)
skrect.set(rect.x(), rect.y(), midx + 1, rect.y() + rect.height());
else
skrect.set(rect.x(), rect.y(), rect.x() + rect.width(), midy + 1);
canvas->drawIRect(skrect, paint);
paint.setColor(PlatformThemeChromiumGtk::saturateAndBrighten(thumb, 0, -0.02));
if (vertical)
skrect.set(midx + 1, rect.y(), rect.x() + rect.width(), rect.y() + rect.height());
else
skrect.set(rect.x(), midy + 1, rect.x() + rect.width(), rect.y() + rect.height());
canvas->drawIRect(skrect, paint);
SkScalar track[3];
SkColorToHSV(PlatformThemeChromiumGtk::trackColor(), track);
paint.setColor(PlatformThemeChromiumGtk::outlineColor(track, thumb));
drawBox(canvas, rect, paint);
if (rect.height() > 10 && rect.width() > 10) {
const int grippyHalfWidth = 2;
const int interGrippyOffset = 3;
if (vertical) {
drawHorizLine(canvas, midx - grippyHalfWidth, midx + grippyHalfWidth, midy - interGrippyOffset, paint);
drawHorizLine(canvas, midx - grippyHalfWidth, midx + grippyHalfWidth, midy, paint);
drawHorizLine(canvas, midx - grippyHalfWidth, midx + grippyHalfWidth, midy + interGrippyOffset, paint);
} else {
drawVertLine(canvas, midx - interGrippyOffset, midy - grippyHalfWidth, midy + grippyHalfWidth, paint);
drawVertLine(canvas, midx, midy - grippyHalfWidth, midy + grippyHalfWidth, paint);
drawVertLine(canvas, midx + interGrippyOffset, midy - grippyHalfWidth, midy + grippyHalfWidth, paint);
}
}
}
bool ScrollbarThemeChromiumLinux::shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent& evt)
{
return (evt.shiftKey() && evt.button() == LeftButton) || (evt.button() == MiddleButton);
}
IntSize ScrollbarThemeChromiumLinux::buttonSize(Scrollbar* scrollbar)
{
if (scrollbar->orientation() == VerticalScrollbar)
return IntSize(scrollbarThicknessValue, buttonLength);
// HorizontalScrollbar
return IntSize(buttonLength, scrollbarThicknessValue);
}
int ScrollbarThemeChromiumLinux::minimumThumbLength(Scrollbar* scrollbar)
{
// This matches Firefox on Linux.
return 2 * scrollbarThickness(scrollbar->controlSize());
}
} // namespace WebCore
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