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// Copyright 2016 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_GFX_X_WINDOW_EVENT_MANAGER_H_
#define UI_GFX_X_WINDOW_EVENT_MANAGER_H_
#include <map>
#include "base/component_export.h"
#include "ui/gfx/x/xproto.h"
namespace x11 {
class WindowEventManager;
// Ensures events in |event_mask| are selected on |window| for the duration of
// this object's lifetime.
class COMPONENT_EXPORT(X11) ScopedEventSelector {
public:
ScopedEventSelector();
ScopedEventSelector(ScopedEventSelector&& other);
ScopedEventSelector& operator=(ScopedEventSelector&& other);
~ScopedEventSelector();
void Reset();
private:
// Allow Connection to call the private constructor.
friend class Connection;
ScopedEventSelector(Connection* connection,
Window window,
EventMask event_mask);
void Swap(ScopedEventSelector& other);
Window window_ = Window::None;
EventMask event_mask_ = EventMask::NoEvent;
raw_ptr<WindowEventManager> event_manager_ = nullptr;
};
// Allows multiple clients within Chrome to select events on the same X window.
class WindowEventManager {
public:
explicit WindowEventManager(Connection* connection);
WindowEventManager(const WindowEventManager&) = delete;
WindowEventManager& operator=(const WindowEventManager&) = delete;
~WindowEventManager();
void Reset();
private:
friend class ScopedEventSelector;
class MultiMask;
// 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);
raw_ptr<Connection> connection_;
std::map<Window, std::unique_ptr<MultiMask>> mask_map_;
};
} // namespace x11
#endif // UI_GFX_X_WINDOW_EVENT_MANAGER_H_
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