123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081 |
- // Copyright 2021 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 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_
|