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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 CONTENT_RENDERER_MOUSE_LOCK_DISPATCHER_H_
#define CONTENT_RENDERER_MOUSE_LOCK_DISPATCHER_H_
#pragma once
#include "base/basictypes.h"
#include "content/public/renderer/render_view_observer.h"
class RenderViewImpl;
namespace WebKit {
class WebMouseEvent;
class WebWidget;
} // namespace WebKit
namespace webkit{
namespace ppapi {
class PluginInstance;
} // namespace ppapi
} // namespace webkit
// MouseLockDispatcher is owned by RenderViewImpl.
class CONTENT_EXPORT MouseLockDispatcher : public content::RenderViewObserver {
public:
explicit MouseLockDispatcher(RenderViewImpl* render_view_impl);
virtual ~MouseLockDispatcher();
class LockTarget {
public:
virtual ~LockTarget() {}
// A mouse lock request was pending and this reports success or failure.
virtual void OnLockMouseACK(bool succeeded) = 0;
// A mouse lock was in place, but has been lost.
virtual void OnMouseLockLost() = 0;
// A mouse lock is enabled and mouse events are being delievered.
virtual bool HandleMouseLockedInputEvent(
const WebKit::WebMouseEvent& event) = 0;
};
// Locks the mouse to the |target|. If true is returned, an asynchronous
// response to target->OnLockMouseACK() will follow.
bool LockMouse(LockTarget* target);
// Request to unlock the mouse. An asynchronous response to
// target->OnMouseLockLost() will follow.
void UnlockMouse(LockTarget* target);
// Clears out the reference to the |target| because it has or is being
// destroyed. Unlocks if locked. The pointer will not be accessed.
void OnLockTargetDestroyed(LockTarget* target);
bool IsMouseLockedTo(LockTarget* target);
// Allow lock target to consumed a mouse event, if it does return true.
bool WillHandleMouseEvent(const WebKit::WebMouseEvent& event);
private:
// RenderView::Observer implementation.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
// IPC handlers.
void OnLockMouseACK(bool succeeded);
void OnMouseLockLost();
bool MouseLockedOrPendingAction() const {
return mouse_locked_ || pending_lock_request_ || pending_unlock_request_;
}
RenderViewImpl* render_view_impl_;
bool mouse_locked_;
// If both |pending_lock_request_| and |pending_unlock_request_| are true,
// it means a lock request was sent before an unlock request and we haven't
// received responses for them. The logic in LockMouse() makes sure that a
// lock request won't be sent when there is a pending unlock request.
bool pending_lock_request_;
bool pending_unlock_request_;
// |target_| is the pending or current owner of mouse lock. We retain a non
// owning reference here that must be cleared by |OnLockTargetDestroyed|
// when it is destroyed.
LockTarget* target_;
DISALLOW_COPY_AND_ASSIGN(MouseLockDispatcher);
};
#endif // CONTENT_RENDERER_MOUSE_LOCK_DISPATCHER_H_
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