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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/controls/menu/menu_image_util.h"
#include "base/i18n/rtl.h"
#include "base/logging.h"
#include "grit/ui_resources.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/canvas_image_source.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_source.h"
#include "ui/gfx/point.h"
#include "ui/gfx/size.h"
namespace {
// Size of the radio button inciator.
const int kSelectedIndicatorSize = 5;
const int kIndicatorSize = 10;
// Used for the radio indicator. See theme_draw for details.
const double kGradientStop = .5;
const SkColor kGradient0 = SkColorSetRGB(255, 255, 255);
const SkColor kGradient1 = SkColorSetRGB(255, 255, 255);
const SkColor kGradient2 = SkColorSetRGB(0xD8, 0xD8, 0xD8);
const SkColor kBaseStroke = SkColorSetRGB(0x8F, 0x8F, 0x8F);
const SkColor kRadioButtonIndicatorGradient0 = SkColorSetRGB(0, 0, 0);
const SkColor kRadioButtonIndicatorGradient1 = SkColorSetRGB(0x83, 0x83, 0x83);
const SkColor kIndicatorStroke = SkColorSetRGB(0, 0, 0);
class RadioButtonImageSource : public gfx::CanvasImageSource {
public:
explicit RadioButtonImageSource(bool selected)
: CanvasImageSource(gfx::Size(kIndicatorSize + 2, kIndicatorSize + 2),
false),
selected_(selected) {
}
virtual ~RadioButtonImageSource() {}
virtual void Draw(gfx::Canvas* canvas) OVERRIDE {
canvas->Translate(gfx::Vector2d(1, 1));
SkPoint gradient_points[3];
gradient_points[0].iset(0, 0);
gradient_points[1].iset(0,
static_cast<int>(kIndicatorSize * kGradientStop));
gradient_points[2].iset(0, kIndicatorSize);
SkColor gradient_colors[3] = { kGradient0, kGradient1, kGradient2 };
SkShader* shader = SkGradientShader::CreateLinear(
gradient_points, gradient_colors, NULL, arraysize(gradient_points),
SkShader::kClamp_TileMode, NULL);
SkPaint paint;
paint.setStyle(SkPaint::kFill_Style);
paint.setAntiAlias(true);
paint.setShader(shader);
shader->unref();
int radius = kIndicatorSize / 2;
canvas->sk_canvas()->drawCircle(radius, radius, radius, paint);
paint.setStrokeWidth(SkIntToScalar(0));
paint.setShader(NULL);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(kBaseStroke);
canvas->sk_canvas()->drawCircle(radius, radius, radius, paint);
if (selected_) {
SkPoint selected_gradient_points[2];
selected_gradient_points[0].iset(0, 0);
selected_gradient_points[1].iset(0, kSelectedIndicatorSize);
SkColor selected_gradient_colors[2] = { kRadioButtonIndicatorGradient0,
kRadioButtonIndicatorGradient1 };
shader = SkGradientShader::CreateLinear(
selected_gradient_points, selected_gradient_colors, NULL,
arraysize(selected_gradient_points), SkShader::kClamp_TileMode, NULL);
paint.setShader(shader);
shader->unref();
paint.setStyle(SkPaint::kFill_Style);
canvas->sk_canvas()->drawCircle(radius, radius,
kSelectedIndicatorSize / 2, paint);
paint.setStrokeWidth(SkIntToScalar(0));
paint.setShader(NULL);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(kIndicatorStroke);
canvas->sk_canvas()->drawCircle(radius, radius,
kSelectedIndicatorSize / 2, paint);
}
}
private:
bool selected_;
DISALLOW_COPY_AND_ASSIGN(RadioButtonImageSource);
};
gfx::ImageSkia* CreateRadioButtonImage(bool selected) {
RadioButtonImageSource* source = new RadioButtonImageSource(selected);
return new gfx::ImageSkia(source, source->size());
}
class SubmenuArrowImageSource : public gfx::CanvasImageSource {
public:
SubmenuArrowImageSource()
: gfx::CanvasImageSource(GetSubmenuArrowSize(), false) {
}
virtual ~SubmenuArrowImageSource() {}
virtual void Draw(gfx::Canvas* canvas) OVERRIDE {
ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
const gfx::ImageSkia* r = rb.GetImageNamed(IDR_MENU_ARROW).ToImageSkia();
canvas->Scale(-1, 1);
canvas->DrawImageInt(*r, - r->width(), 0);
}
private:
static gfx::Size GetSubmenuArrowSize() {
return ui::ResourceBundle::GetSharedInstance()
.GetImageNamed(IDR_MENU_ARROW).ToImageSkia()->size();
}
DISALLOW_COPY_AND_ASSIGN(SubmenuArrowImageSource);
};
gfx::ImageSkia* GetRtlSubmenuArrowImage() {
static gfx::ImageSkia* kRtlArrow = NULL;
if (!kRtlArrow) {
SubmenuArrowImageSource* source = new SubmenuArrowImageSource();
kRtlArrow = new gfx::ImageSkia(source, source->size());
}
return kRtlArrow;
}
} // namespace
namespace views {
const gfx::ImageSkia* GetRadioButtonImage(bool selected) {
static const gfx::ImageSkia* kRadioOn = CreateRadioButtonImage(true);
static const gfx::ImageSkia* kRadioOff = CreateRadioButtonImage(false);
return selected ? kRadioOn : kRadioOff;
}
const gfx::ImageSkia* GetSubmenuArrowImage() {
ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
return base::i18n::IsRTL() ? GetRtlSubmenuArrowImage()
: rb.GetImageNamed(IDR_MENU_ARROW).ToImageSkia();
}
} // namespace views
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