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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_CONTROLS_GRADIENT_LAYER_DELEGATE_H_
#define ASH_CONTROLS_GRADIENT_LAYER_DELEGATE_H_
#include <memory>
#include "ash/ash_export.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_delegate.h"
#include "ui/gfx/animation/animation_delegate.h"
#include "ui/gfx/geometry/rect.h"
namespace gfx {
class Canvas;
class LinearAnimation;
} // namespace gfx
namespace ash {
// A layer delegate that paints optional fade-in/out gradient zones at the ends
// of its layer.
class ASH_EXPORT GradientLayerDelegate : public ui::LayerDelegate,
public gfx::AnimationDelegate {
public:
struct FadeZone {
// Bounds of the fade in/out zone.
gfx::Rect zone_rect;
// Specifies the type of FadeZone: fade in or fade out.
bool fade_in = false;
// Indicates the drawing direction.
bool is_horizontal = false;
};
// If `animate_in` is true, the gradient will quickly animate in when it is
// first created. See https://crbug.com/1293100
explicit GradientLayerDelegate(bool animate_in);
GradientLayerDelegate(const GradientLayerDelegate&) = delete;
GradientLayerDelegate& operator=(const GradientLayerDelegate&) = delete;
~GradientLayerDelegate() override;
void set_start_fade_zone(const FadeZone& fade_zone) {
start_fade_zone_ = fade_zone;
}
void set_end_fade_zone(const FadeZone& fade_zone) {
end_fade_zone_ = fade_zone;
}
const gfx::Rect& start_fade_zone_bounds() const {
return start_fade_zone_.zone_rect;
}
const gfx::Rect& end_fade_zone_bounds() const {
return end_fade_zone_.zone_rect;
}
ui::Layer* layer() { return &layer_; }
private:
// ui::LayerDelegate:
void OnPaintLayer(const ui::PaintContext& context) override;
void OnDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) override {}
// gfx::AnimationDelegate:
void AnimationProgressed(const gfx::Animation* animation) override;
void DrawFadeZone(const FadeZone& fade_zone, gfx::Canvas* canvas);
ui::Layer layer_;
FadeZone start_fade_zone_;
FadeZone end_fade_zone_;
// Optional animation to quickly animate in the gradient on creation.
std::unique_ptr<gfx::LinearAnimation> animation_;
};
} // namespace ash
#endif // ASH_CONTROLS_GRADIENT_LAYER_DELEGATE_H_
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