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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_
#include "base/macros.h"
#include "content/common/content_export.h"
namespace blink {
class WebMouseEvent;
} // namespace blink
namespace content {
class CONTENT_EXPORT MouseLockDispatcher {
public:
MouseLockDispatcher();
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 blink::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 blink::WebMouseEvent& event);
// Subclasses or users have to call these methods to report mouse lock events
// from the browser.
void OnLockMouseACK(bool succeeded);
void OnMouseLockLost();
protected:
// Subclasses must implement these methods to send mouse lock requests to the
// browser.
virtual void SendLockMouseRequest(bool unlocked_by_target) = 0;
virtual void SendUnlockMouseRequest() = 0;
private:
bool MouseLockedOrPendingAction() const {
return mouse_locked_ || pending_lock_request_ || pending_unlock_request_;
}
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_;
// Used when locking to indicate when a target application has voluntarily
// unlocked and desires to relock the mouse. If the mouse is unlocked due
// to ESC being pressed by the user, this will be false
bool unlocked_by_target_;
// |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);
};
} // namespace content
#endif // CONTENT_RENDERER_MOUSE_LOCK_DISPATCHER_H_
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