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mojo/services/window_manager/focus_controller.h

+// Copyright 2014 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 SERVICES_WINDOW_MANAGER_FOCUS_CONTROLLER_H_
+#define SERVICES_WINDOW_MANAGER_FOCUS_CONTROLLER_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
+#include "base/scoped_observer.h"
+#include "third_party/mojo_services/src/view_manager/public/cpp/view_observer.h"
+#include "ui/events/event_handler.h"
+
+namespace window_manager {
+
+class FocusControllerObserver;
+class FocusRules;
+
+// FocusController handles focus and activation changes in a mojo window
+// manager. Within the window manager, there can only be one focused and one
+// active window at a time. When focus or activation changes, notifications are
+// sent using the FocusControllerObserver interface.
+class FocusController : public ui::EventHandler, public mojo::ViewObserver {
+ public:
+  // |rules| cannot be null.
+  explicit FocusController(scoped_ptr<FocusRules> rules);
+  ~FocusController() override;
+
+  void AddObserver(FocusControllerObserver* observer);
+  void RemoveObserver(FocusControllerObserver* observer);
+
+  void ActivateView(mojo::View* view);
+  void DeactivateView(mojo::View* view);
+  mojo::View* GetActiveView();
+  mojo::View* GetActivatableView(mojo::View* view);
+  mojo::View* GetToplevelView(mojo::View* view);
+  bool CanActivateView(mojo::View* view) const;
+
+  void FocusView(mojo::View* view);
+
+  void ResetFocusWithinActiveView(mojo::View* view);
+  mojo::View* GetFocusedView();
+
+  // Overridden from ui::EventHandler:
+  void OnKeyEvent(ui::KeyEvent* event) override;
+  void OnMouseEvent(ui::MouseEvent* event) override;
+  void OnScrollEvent(ui::ScrollEvent* event) override;
+  void OnTouchEvent(ui::TouchEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
+
+  // Overridden from ViewObserver:
+  void OnTreeChanging(const TreeChangeParams& params) override;
+  void OnTreeChanged(const TreeChangeParams& params) override;
+  void OnViewVisibilityChanged(mojo::View* view) override;
+  void OnViewDestroying(mojo::View* view) override;
+
+ private:
+  // Internal implementation that sets the focused view, fires events etc.
+  // This function must be called with a valid focusable view.
+  void SetFocusedView(mojo::View* view);
+
+  // Internal implementation that sets the active window, fires events etc.
+  // This function must be called with a valid |activatable_window|.
+  // |requested window| refers to the window that was passed in to an external
+  // request (e.g. FocusWindow or ActivateWindow). It may be null, e.g. if
+  // SetActiveWindow was not called by an external request. |activatable_window|
+  // refers to the actual window to be activated, which may be different.
+  void SetActiveView(mojo::View* requested_view, mojo::View* activatable_view);
+
+  // Called when a window's disposition changed such that it and its hierarchy
+  // are no longer focusable/activatable. |next| is a valid window that is used
+  // as a starting point for finding a window to focus next based on rules.
+  void ViewLostFocusFromDispositionChange(mojo::View* view, mojo::View* next);
+
+  // Called when an attempt is made to focus or activate a window via an input
+  // event targeted at that window. Rules determine the best focusable window
+  // for the input window.
+  void ViewFocusedFromInputEvent(mojo::View* view);
+
+  mojo::View* active_view_;
+  mojo::View* focused_view_;
+
+  bool updating_focus_;
+  bool updating_activation_;
+
+  scoped_ptr<FocusRules> rules_;
+
+  ObserverList<FocusControllerObserver> focus_controller_observers_;
+
+  ScopedObserver<mojo::View, ViewObserver> observer_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(FocusController);
+};
+
+// Sets/Gets the focus controller for a view.
+void SetFocusController(mojo::View* view, FocusController* focus_controller);
+FocusController* GetFocusController(mojo::View* view);
+
+}  // namespace window_manager
+
+#endif  // SERVICES_WINDOW_MANAGER_FOCUS_CONTROLLER_H_