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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GFX_NATIVE_THEME_LINUX_H_
#define GFX_NATIVE_THEME_LINUX_H_
#include "base/basictypes.h"
#include "skia/ext/platform_canvas.h"
namespace skia {
class PlatformCanvas;
}
namespace gfx {
class Rect;
class Size;
// Linux theming API.
class NativeThemeLinux {
public:
// Gets our singleton instance.
static NativeThemeLinux* instance();
// The part to be painted / sized.
enum Part {
kScrollbarDownArrow,
kScrollbarLeftArrow,
kScrollbarRightArrow,
kScrollbarUpArrow,
kScrollbarHorizontalThumb,
kScrollbarVerticalThumb,
kScrollbarHorizontalTrack,
kScrollbarVerticalTrack
};
// The state of the part.
enum State {
kDisabled,
kHover,
kNormal,
kPressed,
};
// Extra data needed to draw scrollbar track correctly.
struct ScrollbarTrackExtraParams {
int track_x;
int track_y;
int track_width;
int track_height;
};
union ExtraParams {
ScrollbarTrackExtraParams scrollbar_track;
};
// Return the size of the part.
virtual gfx::Size GetSize(Part part) const;
// Paint the part to the canvas.
virtual void Paint(skia::PlatformCanvas* canvas,
Part part,
State state,
const gfx::Rect& rect,
const ExtraParams& extra);
// Supports theme specific colors.
void SetScrollbarColors(unsigned inactive_color,
unsigned active_color,
unsigned track_color) const;
protected:
NativeThemeLinux();
virtual ~NativeThemeLinux();
// Draw the arrow.
virtual void PaintArrowButton(
skia::PlatformCanvas* gc,
const gfx::Rect& rect,
Part direction,
State state);
// Paint the track. Done before the thumb so that it can contain alpha.
virtual void PaintTrack(skia::PlatformCanvas* canvas,
Part part,
State state,
const ScrollbarTrackExtraParams& extra_params,
const gfx::Rect& rect);
// Draw the thumb over the track.
virtual void PaintThumb(skia::PlatformCanvas* canvas,
Part part,
State state,
const gfx::Rect& rect);
private:
void DrawVertLine(SkCanvas* canvas,
int x,
int y1,
int y2,
const SkPaint& paint) const;
void DrawHorizLine(SkCanvas* canvas,
int x1,
int x2,
int y,
const SkPaint& paint) const;
void DrawBox(SkCanvas* canvas,
const gfx::Rect& rect,
const SkPaint& paint) const;
SkScalar Clamp(SkScalar value,
SkScalar min,
SkScalar max) const;
SkColor SaturateAndBrighten(SkScalar* hsv,
SkScalar saturate_amount,
SkScalar brighten_amount) const;
SkColor OutlineColor(SkScalar* hsv1, SkScalar* hsv2) const;
static unsigned int scrollbar_width_;
static unsigned int button_length_;
static unsigned int thumb_inactive_color_;
static unsigned int thumb_active_color_;
static unsigned int track_color_;
DISALLOW_COPY_AND_ASSIGN(NativeThemeLinux);
};
} // namespace gfx
#endif // GFX_NATIVE_THEME_LINUX_H_
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