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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
#define UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
#include <vector>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "ui/aura/window_observer.h"
#include "ui/wm/public/activation_change_observer.h"
#include "ui/wm/public/activation_client.h"
namespace wm {
class ActivationChangeObserver;
// Simple ActivationClient implementation for use by tests and other targets
// that just need basic behavior (e.g. activate windows whenever requested,
// restack windows at the top when they're activated, etc.). This object deletes
// itself when the root window it is associated with is destroyed.
class COMPONENT_EXPORT(UI_WM) DefaultActivationClient
: public ActivationClient,
public aura::WindowObserver {
public:
explicit DefaultActivationClient(aura::Window* root_window);
DefaultActivationClient(const DefaultActivationClient&) = delete;
DefaultActivationClient& operator=(const DefaultActivationClient&) = delete;
// Overridden from ActivationClient:
void AddObserver(ActivationChangeObserver* observer) override;
void RemoveObserver(ActivationChangeObserver* observer) override;
void ActivateWindow(aura::Window* window) override;
void DeactivateWindow(aura::Window* window) override;
const aura::Window* GetActiveWindow() const override;
aura::Window* GetActivatableWindow(aura::Window* window) const override;
const aura::Window* GetToplevelWindow(
const aura::Window* window) const override;
bool CanActivateWindow(const aura::Window* window) const override;
// Overridden from WindowObserver:
void OnWindowDestroyed(aura::Window* window) override;
private:
class Deleter;
~DefaultActivationClient() override;
void RemoveActiveWindow(aura::Window* window);
void ActivateWindowImpl(ActivationChangeObserver::ActivationReason reason,
aura::Window* window);
void ClearActiveWindows();
// This class explicitly does NOT store the active window in a window property
// to make sure that ActivationChangeObserver is not treated as part of the
// aura API. Assumptions to that end will cause tests that use this client to
// fail.
std::vector<raw_ptr<aura::Window, VectorExperimental>> active_windows_;
// The window which was active before the currently active one.
raw_ptr<aura::Window, DanglingUntriaged> last_active_;
base::ObserverList<ActivationChangeObserver> observers_;
};
} // namespace wm
#endif // UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
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