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/**************************************************************
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*************************************************************/
#ifndef SD_UPDATE_LOCK_MANAGER_HXX
#define SD_UPDATE_LOCK_MANAGER_HXX
#include <memory>
namespace sd {
class ViewShellBase;
/** Manage update locks of ViewShellBase objects.
A ViewShellBase object is locked while views are switched in order to
avoid unnecessary repaints of views and object bars.
Locking a ViewShellBase locks the frame::XLayoutManager and prevents
Activate() and Deactivate() calls at ViewShell objects being processed.
The main responsibility of this class is find the right moment to unlock
the managed ViewShellBase object: Only Lock() has to be called from the
outside (usually from PaneManager). Unlock() is called by this class
itself. When all else fails it has a timer that calls Unlock()
eventually.
*/
class UpdateLockManager
{
public:
/** The newly created instance supports locking for the specified
ViewShellBase object by default. Call Disable() for Lock() and
Unlock() calls being ignored.
*/
UpdateLockManager (ViewShellBase& rBase);
~UpdateLockManager (void);
/** For e.g. the PresentationViewShellBase locking is not necessary and
does lead to problems. This method lets Lock() and Unlock() calls
be ignored and thus turns locking essentially off.
*/
void Disable (void);
/** Lock some UI updates. For every call to this method a call to
Unlock() is required to really unlock.
*/
void Lock (void);
/** When called as many times as Lock() has been called before then the
ViewShellBase object is unlocked.
*/
void Unlock (void);
/** Return whether the ViewShellBase object is locked. When locking is
disabled, i.e. Disable() has been called before, then this method
always returns <FALSE/>.
*/
bool IsLocked (void) const;
private:
class Implementation;
Implementation* mpImpl;
UpdateLockManager (const UpdateLockManager&); // Not supported.
UpdateLockManager& operator= (const UpdateLockManager&); // Not supported.
};
} // end of namespace sd
#endif
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