| // Copyright 2015 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_MUS_LAYOUT_MANAGER_H_ |
| #define ASH_MUS_LAYOUT_MANAGER_H_ |
| |
| #include <stdint.h> |
| |
| #include "base/macros.h" |
| #include "services/ui/public/cpp/window_observer.h" |
| |
| namespace ash { |
| namespace mus { |
| |
| // Base class for container layout managers. Derived classes override |
| // LayoutWindow() to perform layout and register properties to which |
| // changes trigger layout. |
| // LayoutManagers observe both the bound container and all its children. |
| // They must be attached prior to any windows being added to the |
| // container. |
| class LayoutManager : public ui::WindowObserver { |
| public: |
| ~LayoutManager() override; |
| |
| protected: |
| explicit LayoutManager(ui::Window* owner); |
| |
| void Uninstall(); |
| |
| // Overridden from ui::WindowObserver: |
| void OnTreeChanged( |
| const ui::WindowObserver::TreeChangeParams& params) override; |
| void OnWindowDestroying(ui::Window* window) override; |
| void OnWindowBoundsChanged(ui::Window* window, |
| const gfx::Rect& old_bounds, |
| const gfx::Rect& new_bounds) override; |
| void OnWindowSharedPropertyChanged( |
| ui::Window* window, |
| const std::string& name, |
| const std::vector<uint8_t>* old_data, |
| const std::vector<uint8_t>* new_data) override; |
| |
| virtual void WindowAdded(ui::Window* window); |
| virtual void WindowRemoved(ui::Window* window); |
| virtual void LayoutWindow(ui::Window* window) = 0; |
| |
| // Add a property that triggers layout when changed. |
| void AddLayoutProperty(const std::string& property); |
| |
| ui::Window* owner() { return owner_; } |
| |
| private: |
| ui::Window* owner_; |
| |
| std::set<std::string> layout_properties_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LayoutManager); |
| }; |
| |
| } // namespace mus |
| } // namespace ash |
| |
| #endif // ASH_MUS_LAYOUT_MANAGER_H_ |