| // Copyright 2016 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 UI_GFX_X_X11_WINDOW_EVENT_MANAGER_H_ |
| #define UI_GFX_X_X11_WINDOW_EVENT_MANAGER_H_ |
| |
| #include <map> |
| |
| #include "base/component_export.h" |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| #include "ui/gfx/x/connection.h" |
| |
| namespace base { |
| template <typename T> |
| struct DefaultSingletonTraits; |
| } |
| |
| namespace x11 { |
| |
| class XWindowEventManager; |
| |
| // Ensures events in |event_mask| are selected on |window| for the duration of |
| // this object's lifetime. |
| class COMPONENT_EXPORT(X11) XScopedEventSelector { |
| public: |
| XScopedEventSelector(Window window, EventMask event_mask); |
| |
| XScopedEventSelector(const XScopedEventSelector&) = delete; |
| XScopedEventSelector& operator=(const XScopedEventSelector&) = delete; |
| |
| ~XScopedEventSelector(); |
| |
| private: |
| Window window_; |
| EventMask event_mask_; |
| base::WeakPtr<XWindowEventManager> event_manager_; |
| }; |
| |
| // Allows multiple clients within Chrome to select events on the same X window. |
| class XWindowEventManager { |
| public: |
| static XWindowEventManager* GetInstance(); |
| |
| XWindowEventManager(const XWindowEventManager&) = delete; |
| XWindowEventManager& operator=(const XWindowEventManager&) = delete; |
| |
| private: |
| friend struct base::DefaultSingletonTraits<XWindowEventManager>; |
| friend class XScopedEventSelector; |
| |
| class MultiMask; |
| |
| XWindowEventManager(); |
| ~XWindowEventManager(); |
| |
| // Guarantees that events in |event_mask| will be reported to Chrome. |
| void SelectEvents(Window window, EventMask event_mask); |
| |
| // Deselects events on |event_mask|. Chrome will stop receiving events for |
| // any set bit in |event_mask| only if no other client has selected that bit. |
| void DeselectEvents(Window window, EventMask event_mask); |
| |
| // Helper method called by SelectEvents and DeselectEvents whenever the mask |
| // corresponding to |window| might have changed. Calls SetEventMask if |
| // necessary. |
| void AfterMaskChanged(Window window, EventMask old_mask); |
| |
| std::map<Window, std::unique_ptr<MultiMask>> mask_map_; |
| |
| // This is used to set XScopedEventSelector::event_manager_. If |this| is |
| // destroyed before any XScopedEventSelector, the |event_manager_| will become |
| // invalidated. |
| base::WeakPtrFactory<XWindowEventManager> weak_ptr_factory_{this}; |
| }; |
| |
| } // namespace x11 |
| |
| #endif // UI_GFX_X_X11_WINDOW_EVENT_MANAGER_H_ |