| // Copyright (c) 2012 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 ASH_WM_BASE_LAYOUT_MANAGER_H_ |
| #define ASH_WM_BASE_LAYOUT_MANAGER_H_ |
| |
| #include <set> |
| |
| #include "ash/ash_export.h" |
| #include "ash/shell_observer.h" |
| #include "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| #include "ui/aura/client/activation_change_observer.h" |
| #include "ui/aura/layout_manager.h" |
| #include "ui/aura/window_observer.h" |
| #include "ui/base/events/event_handler.h" |
| #include "ui/base/ui_base_types.h" |
| |
| namespace aura { |
| class RootWindow; |
| class Window; |
| } |
| |
| namespace ash { |
| namespace internal { |
| |
| // BaseLayoutManager is the simplest possible implementation for a window |
| // layout manager. It listens for changes to kShowStateKey and resizes the |
| // window appropriately. Subclasses should be sure to invoke the base class |
| // for adding and removing windows, otherwise show state will not be tracked |
| // properly. |
| class ASH_EXPORT BaseLayoutManager |
| : public aura::LayoutManager, |
| public ash::ShellObserver, |
| public aura::WindowObserver, |
| public aura::client::ActivationChangeObserver { |
| public: |
| typedef std::set<aura::Window*> WindowSet; |
| |
| explicit BaseLayoutManager(aura::RootWindow* root_window); |
| virtual ~BaseLayoutManager(); |
| |
| const WindowSet& windows() const { return windows_; } |
| |
| // Given a |window| and tentative |restore_bounds|, returns new bounds that |
| // ensure that at least a few pixels of the screen background are visible |
| // outside the edges of the window. |
| static gfx::Rect BoundsWithScreenEdgeVisible(aura::Window* window, |
| const gfx::Rect& restore_bounds); |
| |
| // LayoutManager overrides: |
| virtual void OnWindowResized() OVERRIDE; |
| virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE; |
| virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE; |
| virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE; |
| virtual void OnChildWindowVisibilityChanged(aura::Window* child, |
| bool visible) OVERRIDE; |
| virtual void SetChildBounds(aura::Window* child, |
| const gfx::Rect& requested_bounds) OVERRIDE; |
| |
| // ash::ShellObserver overrides: |
| virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE; |
| |
| // WindowObserver overrides: |
| virtual void OnWindowPropertyChanged(aura::Window* window, |
| const void* key, |
| intptr_t old) OVERRIDE; |
| virtual void OnWindowDestroying(aura::Window* window) OVERRIDE; |
| virtual void OnWindowBoundsChanged(aura::Window* window, |
| const gfx::Rect& old_bounds, |
| const gfx::Rect& new_bounds) OVERRIDE; |
| |
| // aura::client::ActivationChangeObserver overrides: |
| virtual void OnWindowActivated(aura::Window* gained_active, |
| aura::Window* lost_active) OVERRIDE; |
| |
| protected: |
| enum AdjustWindowReason { |
| ADJUST_WINDOW_SCREEN_SIZE_CHANGED, |
| ADJUST_WINDOW_DISPLAY_INSETS_CHANGED, |
| ADJUST_WINDOW_WINDOW_ADDED |
| }; |
| |
| // Invoked from OnWindowPropertyChanged() if |kShowStateKey| changes. |
| virtual void ShowStateChanged(aura::Window* window, |
| ui::WindowShowState last_show_state); |
| |
| // Adjusts the window sizes when the screen changes its size or its |
| // work area insets. If this is called for a screen size change (i.e. |reason| |
| // is ADJUST_WINDOW_SCREEN_SIZE_CHANGED), the non-maximized/non-fullscreen |
| // windows are readjusted to make sure the window is completely within the |
| // display region. Otherwise, it makes sure at least some parts of the window |
| // is on display. |
| virtual void AdjustWindowSizesForScreenChange(AdjustWindowReason reason); |
| |
| // Adjusts the sizes of the specific window in respond to a screen change or |
| // display-area size change. |
| virtual void AdjustWindowSizeForScreenChange(aura::Window* window, |
| AdjustWindowReason reason); |
| |
| aura::RootWindow* root_window() { return root_window_; } |
| |
| private: |
| // Update window bounds based on a change in show state. |
| void UpdateBoundsFromShowState(aura::Window* window); |
| |
| // Set of windows we're listening to. |
| WindowSet windows_; |
| |
| aura::RootWindow* root_window_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BaseLayoutManager); |
| }; |
| |
| } // namespace internal |
| } // namespace ash |
| |
| #endif // ASH_WM_BASE_LAYOUT_MANAGER_H_ |