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// Copyright 2020 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_DRAG_DROP_TAB_DRAG_DROP_WINDOWS_HIDER_H_
#define ASH_DRAG_DROP_TAB_DRAG_DROP_WINDOWS_HIDER_H_
#include <map>
#include "ash/ash_export.h"
#include "base/memory/raw_ptr.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
namespace ash {
// Hides all visible windows except the source window from which the webui tab
// drag originates, and restores the windows' visibility upon its destruction.
// It also blurs and darkens the background, hides the home launcher if home
// launcher is enabled. Only need to do so if we need to scale up and down the
// source window when dragging a web ui tab out of it.
class ASH_EXPORT TabDragDropWindowsHider : public aura::WindowObserver {
public:
explicit TabDragDropWindowsHider(aura::Window* source_window);
TabDragDropWindowsHider(const TabDragDropWindowsHider&) = delete;
TabDragDropWindowsHider& operator=(const TabDragDropWindowsHider&) = delete;
~TabDragDropWindowsHider() override;
// aura::WindowObserver:
void OnWindowDestroying(aura::Window* window) override;
void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
int GetWindowVisibilityMapSizeForTesting() const;
private:
// The window from which the drag originated.
raw_ptr<aura::Window> source_window_;
// The root window the drag is taking place within. Guaranteed to be
// non-null during the lifetime of |this|.
raw_ptr<aura::Window> root_window_;
// Maintains the map between windows and their visibilities. All windows
// except the dragged window and the source window should stay hidden during
// dragging.
std::map<aura::Window*, bool> window_visibility_map_;
};
} // namespace ash
#endif // ASH_DRAG_DROP_TAB_DRAG_DROP_WINDOWS_HIDER_H_
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