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// Copyright (c) 2012 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.
#include "ui/views/background.h"
#include "base/logging.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_utils.h"
#include "ui/views/painter.h"
#include "ui/views/view.h"
#if defined(OS_WIN)
#include "skia/ext/skia_utils_win.h"
#endif
namespace views {
// SolidBackground is a trivial Background implementation that fills the
// background in a solid color.
class SolidBackground : public Background {
public:
explicit SolidBackground(SkColor color) {
SetNativeControlColor(color);
}
void Paint(gfx::Canvas* canvas, View* view) const override {
// Fill the background. Note that we don't constrain to the bounds as
// canvas is already clipped for us.
canvas->DrawColor(get_color());
}
private:
DISALLOW_COPY_AND_ASSIGN(SolidBackground);
};
class BackgroundPainter : public Background {
public:
BackgroundPainter(bool owns_painter, Painter* painter)
: owns_painter_(owns_painter), painter_(painter) {
DCHECK(painter);
}
~BackgroundPainter() override {
if (owns_painter_)
delete painter_;
}
void Paint(gfx::Canvas* canvas, View* view) const override {
Painter::PaintPainterAt(canvas, painter_, view->GetLocalBounds());
}
private:
bool owns_painter_;
Painter* painter_;
DISALLOW_COPY_AND_ASSIGN(BackgroundPainter);
};
Background::Background()
: color_(SK_ColorWHITE)
#if defined(OS_WIN)
, native_control_brush_(NULL)
#endif
{
}
Background::~Background() {
#if defined(OS_WIN)
DeleteObject(native_control_brush_);
#endif
}
void Background::SetNativeControlColor(SkColor color) {
color_ = color;
#if defined(OS_WIN)
DeleteObject(native_control_brush_);
native_control_brush_ = NULL;
#endif
}
#if defined(OS_WIN)
HBRUSH Background::GetNativeControlBrush() const {
if (!native_control_brush_)
native_control_brush_ = CreateSolidBrush(skia::SkColorToCOLORREF(color_));
return native_control_brush_;
}
#endif
// static
Background* Background::CreateSolidBackground(SkColor color) {
return new SolidBackground(color);
}
// static
Background* Background::CreateStandardPanelBackground() {
// TODO(beng): Should be in NativeTheme.
return CreateSolidBackground(SK_ColorWHITE);
}
// static
Background* Background::CreateVerticalGradientBackground(SkColor color1,
SkColor color2) {
Background* background = CreateBackgroundPainter(
true, Painter::CreateVerticalGradient(color1, color2));
background->SetNativeControlColor(
color_utils::AlphaBlend(color1, color2, 128));
return background;
}
// static
Background* Background::CreateVerticalMultiColorGradientBackground(
SkColor* colors,
SkScalar* pos,
size_t count) {
Background* background = CreateBackgroundPainter(
true, Painter::CreateVerticalMultiColorGradient(colors, pos, count));
background->SetNativeControlColor(
color_utils::AlphaBlend(colors[0], colors[count-1], 128));
return background;
}
// static
Background* Background::CreateBackgroundPainter(bool owns_painter,
Painter* painter) {
return new BackgroundPainter(owns_painter, painter);
}
} // namespace views
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