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/*
* Copyright (C) 2010 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 "PlatformThemeChromiumGtk.h"
namespace WebCore {
unsigned PlatformThemeChromiumGtk::s_thumbInactiveColor = 0xeaeaea;
unsigned PlatformThemeChromiumGtk::s_thumbActiveColor = 0xf4f4f4;
unsigned PlatformThemeChromiumGtk::s_trackColor = 0xd3d3d3;
void PlatformThemeChromiumGtk::setScrollbarColors(
SkColor inactiveColor, SkColor activeColor, SkColor trackColor)
{
s_thumbInactiveColor = inactiveColor;
s_thumbActiveColor = activeColor;
s_trackColor = trackColor;
}
static SkScalar clamp(SkScalar value, SkScalar min, SkScalar max)
{
return std::min(std::max(value, min), max);
}
SkColor PlatformThemeChromiumGtk::saturateAndBrighten(const SkScalar hsv[3], SkScalar saturateAmount, SkScalar brightenAmount)
{
SkScalar color[3];
color[0] = hsv[0];
color[1] = clamp(hsv[1] + saturateAmount, 0.0, 1.0);
color[2] = clamp(hsv[2] + brightenAmount, 0.0, 1.0);
return SkHSVToColor(color);
}
SkColor PlatformThemeChromiumGtk::outlineColor(const SkScalar hsv1[3], const SkScalar hsv2[3])
{
// GTK Theme engines have way too much control over the layout of
// the scrollbar. We might be able to more closely approximate its
// look-and-feel, if we sent whole images instead of just colors
// from the browser to the renderer. But even then, some themes
// would just break.
//
// So, instead, we don't even try to 100% replicate the look of
// the native scrollbar. We render our own version, but we make
// sure to pick colors that blend in nicely with the system GTK
// theme. In most cases, we can just sample a couple of pixels
// from the system scrollbar and use those colors to draw our
// scrollbar.
//
// This works fine for the track color and the overall thumb
// color. But it fails spectacularly for the outline color used
// around the thumb piece. Not all themes have a clearly defined
// outline. For some of them it is partially transparent, and for
// others the thickness is very unpredictable.
//
// So, instead of trying to approximate the system theme, we
// instead try to compute a reasonable looking choice based on the
// known color of the track and the thumb piece. This is difficult
// when trying to deal both with high- and low-contrast themes,
// and both with positive and inverted themes.
//
// The following code has been tested to look OK with all of the
// default GTK themes.
SkScalar minDiff = clamp((hsv1[1] + hsv2[1]) * 1.2, 0.28, 0.5);
SkScalar diff = clamp(fabs(hsv1[2] - hsv2[2]) / 2, minDiff, 0.5);
if (hsv1[2] + hsv2[2] > 1.0)
diff = -diff;
return saturateAndBrighten(hsv2, -0.2, diff);
}
void PlatformThemeChromiumGtk::paintArrowButton(GraphicsContext* gc, const IntRect& rect, ArrowDirection direction, ControlStates states)
{
SkCanvas* const canvas = gc->platformContext()->canvas();
int widthMiddle, lengthMiddle;
SkPaint paint;
if (direction == North || direction == South) {
widthMiddle = rect.width() / 2 + 1;
lengthMiddle = rect.height() / 2 + 1;
} else {
lengthMiddle = rect.width() / 2 + 1;
widthMiddle = rect.height() / 2 + 1;
}
// Calculate button color.
SkScalar trackHSV[3];
SkColorToHSV(trackColor(), trackHSV);
SkColor buttonColor = saturateAndBrighten(trackHSV, 0, 0.2);
SkColor backgroundColor = buttonColor;
if (states & PressedState) {
SkScalar buttonHSV[3];
SkColorToHSV(buttonColor, buttonHSV);
buttonColor = saturateAndBrighten(buttonHSV, 0, -0.1);
} else if (states & HoverState) {
SkScalar buttonHSV[3];
SkColorToHSV(buttonColor, buttonHSV);
buttonColor = saturateAndBrighten(buttonHSV, 0, 0.05);
}
SkIRect skrect;
skrect.set(rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height());
// Paint the background (the area visible behind the rounded corners).
paint.setColor(backgroundColor);
canvas->drawIRect(skrect, paint);
// Paint the button's outline and fill the middle
SkPath outline;
switch (direction) {
case North:
outline.moveTo(rect.x() + 0.5, rect.y() + rect.height() + 0.5);
outline.rLineTo(0, -(rect.height() - 2));
outline.rLineTo(2, -2);
outline.rLineTo(rect.width() - 5, 0);
outline.rLineTo(2, 2);
outline.rLineTo(0, rect.height() - 2);
break;
case South:
outline.moveTo(rect.x() + 0.5, rect.y() - 0.5);
outline.rLineTo(0, rect.height() - 2);
outline.rLineTo(2, 2);
outline.rLineTo(rect.width() - 5, 0);
outline.rLineTo(2, -2);
outline.rLineTo(0, -(rect.height() - 2));
break;
case East:
outline.moveTo(rect.x() - 0.5, rect.y() + 0.5);
outline.rLineTo(rect.width() - 2, 0);
outline.rLineTo(2, 2);
outline.rLineTo(0, rect.height() - 5);
outline.rLineTo(-2, 2);
outline.rLineTo(-(rect.width() - 2), 0);
break;
case West:
outline.moveTo(rect.x() + rect.width() + 0.5, rect.y() + 0.5);
outline.rLineTo(-(rect.width() - 2), 0);
outline.rLineTo(-2, 2);
outline.rLineTo(0, rect.height() - 5);
outline.rLineTo(2, 2);
outline.rLineTo(rect.width() - 2, 0);
break;
}
outline.close();
paint.setStyle(SkPaint::kFill_Style);
paint.setColor(buttonColor);
canvas->drawPath(outline, paint);
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
SkScalar thumbHSV[3];
SkColorToHSV(thumbInactiveColor(), thumbHSV);
paint.setColor(outlineColor(trackHSV, thumbHSV));
canvas->drawPath(outline, paint);
// If the button is disabled or read-only, the arrow is drawn with the outline color.
if (states & EnabledState && !(states & ReadOnlyState))
paint.setColor(SK_ColorBLACK);
paint.setAntiAlias(false);
paint.setStyle(SkPaint::kFill_Style);
SkPath path;
// The constants in this block of code are hand-tailored to produce good
// looking arrows without anti-aliasing.
switch (direction) {
case North:
path.moveTo(rect.x() + widthMiddle - 4, rect.y() + lengthMiddle + 2);
path.rLineTo(7, 0);
path.rLineTo(-4, -4);
break;
case South:
path.moveTo(rect.x() + widthMiddle - 4, rect.y() + lengthMiddle - 3);
path.rLineTo(7, 0);
path.rLineTo(-4, 4);
break;
case East:
path.moveTo(rect.x() + lengthMiddle - 3, rect.y() + widthMiddle - 4);
path.rLineTo(0, 7);
path.rLineTo(4, -4);
break;
case West:
path.moveTo(rect.x() + lengthMiddle + 1, rect.y() + widthMiddle - 5);
path.rLineTo(0, 9);
path.rLineTo(-4, -4);
break;
}
path.close();
canvas->drawPath(path, paint);
}
} // namespace WebCore
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