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// 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 UI_WM_CORE_CAPTURE_CONTROLLER_H_
#define UI_WM_CORE_CAPTURE_CONTROLLER_H_
#include <set>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/aura/client/capture_client.h"
#include "ui/aura/window_observer.h"
#include "ui/wm/core/wm_core_export.h"
namespace wm {
// Internal CaptureClient implementation. See ScopedCaptureClient for details.
class WM_CORE_EXPORT CaptureController : public aura::client::CaptureClient {
public:
// Adds |root| to the list of RootWindows notified when capture changes.
void Attach(aura::Window* root);
// Removes |root| from the list of RootWindows notified when capture changes.
void Detach(aura::Window* root);
// Returns true if this CaptureController is installed on at least one
// RootWindow.
bool is_active() const { return !root_windows_.empty(); }
// Overridden from aura::client::CaptureClient:
virtual void SetCapture(aura::Window* window) OVERRIDE;
virtual void ReleaseCapture(aura::Window* window) OVERRIDE;
virtual aura::Window* GetCaptureWindow() OVERRIDE;
virtual aura::Window* GetGlobalCaptureWindow() OVERRIDE;
private:
friend class ScopedCaptureClient;
typedef std::set<aura::Window*> RootWindows;
CaptureController();
virtual ~CaptureController();
// The current capture window. NULL if there is no capture window.
aura::Window* capture_window_;
// Set of RootWindows notified when capture changes.
RootWindows root_windows_;
DISALLOW_COPY_AND_ASSIGN(CaptureController);
};
// ScopedCaptureClient is responsible for creating a CaptureClient for a
// RootWindow. Specifically it creates a single CaptureController that is shared
// among all ScopedCaptureClients and adds the RootWindow to it.
class WM_CORE_EXPORT ScopedCaptureClient : public aura::WindowObserver {
public:
explicit ScopedCaptureClient(aura::Window* root);
virtual ~ScopedCaptureClient();
// Returns true if there is a CaptureController with at least one RootWindow.
static bool IsActive();
aura::client::CaptureClient* capture_client() {
return capture_controller_;
}
// Overridden from aura::WindowObserver:
virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
private:
// Invoked from destructor and OnWindowDestroyed() to cleanup.
void Shutdown();
// The single CaptureController instance.
static CaptureController* capture_controller_;
// RootWindow this ScopedCaptureClient was create for.
aura::Window* root_window_;
DISALLOW_COPY_AND_ASSIGN(ScopedCaptureClient);
};
} // namespace wm
#endif // UI_WM_CORE_CAPTURE_CONTROLLER_H_
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