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// Copyright 2013 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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_
#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_
#include <set>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "ui/aura/client/capture_client.h"
#include "ui/views/views_export.h"
namespace aura {
class RootWindow;
}
namespace views {
// Desktop implementation of CaptureClient. There is one CaptureClient per
// DesktopNativeWidgetAura.
//
// DesktopCaptureClient and CaptureController (used by ash) differ slightly in
// how they handle capture. CaptureController is a singleton shared among all
// RootWindows created by ash. An implication of this is that all RootWindows
// know which window has capture. This is not the case with
// DesktopCaptureClient. Instead each RootWindow has its own
// DesktopCaptureClient. This means only the RootWindow of the Window that has
// capture knows which window has capture. All others think no one has
// capture. This behavior is necessitated by Windows occassionally delivering
// mouse events to a window other than the capture window and expecting that
// window to get the event. If we shared the capture window on the desktop this
// behavior would not be possible.
class VIEWS_EXPORT DesktopCaptureClient : public aura::client::CaptureClient {
public:
explicit DesktopCaptureClient(aura::Window* root);
~DesktopCaptureClient() override;
// Exactly the same as GetGlobalCaptureWindow() but static.
static aura::Window* GetCaptureWindowGlobal();
// Overridden from aura::client::CaptureClient:
void SetCapture(aura::Window* window) override;
void ReleaseCapture(aura::Window* window) override;
aura::Window* GetCaptureWindow() override;
aura::Window* GetGlobalCaptureWindow() override;
void AddObserver(aura::client::CaptureClientObserver* observer) override;
void RemoveObserver(aura::client::CaptureClientObserver* observer) override;
private:
using Comparator = bool (*)(const base::WeakPtr<DesktopCaptureClient>&,
const base::WeakPtr<DesktopCaptureClient>&);
using ClientSet = std::set<base::WeakPtr<DesktopCaptureClient>, Comparator>;
aura::Window* root_;
aura::Window* capture_window_ = nullptr;
// The global set of DesktopCaptureClients.
static ClientSet* clients_;
base::ObserverList<aura::client::CaptureClientObserver>::Unchecked observers_;
base::WeakPtrFactory<DesktopCaptureClient> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(DesktopCaptureClient);
};
} // namespace views
#endif // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_