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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_TEST_LAYER_ANIMATION_VERIFIER_H_
#define ASH_TEST_LAYER_ANIMATION_VERIFIER_H_
#include <optional>
#include "base/memory/raw_ptr.h"
#include "ui/compositor/compositor_observer.h"
#include "ui/gfx/geometry/rect.h"
namespace ui {
class Layer;
}
namespace views {
class View;
}
namespace ash {
// The helper class to verify a layer animation on the following things:
// (1) The observed view should not go back and forth during the animation.
// (2) TODO(crbug.com/40181947): The animation should progress to the end
// rather than get interrupted.
// (3) TODO(https://crbug.com/1209001): The observed view should move smoothly
// during the animation. In other words, the view should not move in a janky
// manner (such as jumping).
class LayerAnimationVerifier : public ui::CompositorObserver {
public:
// `layer_with_animation` and `observed_view` should share the compositor.
// Otherwise it is unmeaningful to watch `observed_view` during animation.
LayerAnimationVerifier(ui::Layer* layer_with_animation,
views::View* observed_view);
LayerAnimationVerifier(const LayerAnimationVerifier&) = delete;
LayerAnimationVerifier& operator=(const LayerAnimationVerifier&) = delete;
~LayerAnimationVerifier() override;
// ui::CompositorObserver:
void OnCompositingDidCommit(ui::Compositor* compositor) override;
private:
// Indicates move direction during animation.
enum class MoveDirection { kForward, kBackward };
// Compares `current_screen_bounds` with the most recent screen bounds.
void CompareWithLastBoundsRect(const gfx::Rect& current_screen_bounds);
// Calculates the move direction.
MoveDirection CalculateMoveDirection(int current_data, int last_data) const;
// Returns the compositor of `layer_with_animation`.
ui::Compositor* GetCompositor();
// Indicates the layer on which an animation is going to apply.
const raw_ptr<ui::Layer> layer_with_animation_;
// Indicates the view that is observed during the layer animation.
const raw_ptr<const views::View> observed_view_;
// The screen bounds of `observed_view_` in the most recent compositor commit.
std::optional<gfx::Rect> last_screen_bounds_;
// `observed_view_`'s move direction on x-axis and y-axis respectively.
std::optional<MoveDirection> x_direction_;
std::optional<MoveDirection> y_direction_;
// Indicates the number of comparisons during animation.
int comparison_count_ = 0;
};
} // namespace ash
#endif // ASH_TEST_LAYER_ANIMATION_VERIFIER_H_
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