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// Copyright 2019 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_SHELF_WINDOW_SCALE_ANIMATION_H_
#define ASH_SHELF_WINDOW_SCALE_ANIMATION_H_
#include <memory>
#include <vector>
#include "ash/ash_export.h"
#include "base/auto_reset.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/scoped_observation.h"
#include "ui/aura/window.h"
namespace ash {
enum class BackdropWindowMode;
// The class which does the scale-down animation to shelf or scale-up to restore
// to its original bounds for all windows in the transient tree of |window_|
// after drag ends. Window(s) will be minimized with the descending order
// in the transient tree after animation completes if we're scaling down to
// shelf.
class ASH_EXPORT WindowScaleAnimation {
public:
enum class WindowScaleType {
kScaleDownToShelf,
kScaleUpToRestore,
};
WindowScaleAnimation(WindowScaleType scale_type,
base::OnceClosure opt_callback);
WindowScaleAnimation(const WindowScaleAnimation&) = delete;
WindowScaleAnimation& operator=(const WindowScaleAnimation&) = delete;
~WindowScaleAnimation();
// Starts animating and creating animation observers for all window(s) in the
// transient tree of `window` in a descending order,
void Start(aura::Window* window);
// For tests only:
static base::AutoReset<bool>
EnableScopedFastAnimationForTransientChildForTest();
private:
class AnimationObserver;
void DestroyWindowAnimationObserver(
WindowScaleAnimation::AnimationObserver* animation_observer);
// `window` is the last window in the transient tree to complete its
// animation.
void OnScaleWindowsOnAnimationsCompleted(aura::Window* window);
base::OnceClosure opt_callback_;
const WindowScaleType scale_type_;
// Each window in the transient tree has its own `WindowAnimationObserver`.
std::vector<std::unique_ptr<AnimationObserver>> window_animation_observers_;
};
} // namespace ash
#endif // ASH_SHELF_WINDOW_SCALE_ANIMATION_H_
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