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78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*=========================================================================
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Program: ParaView
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Module: $RCSfile$
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Copyright (c) 2005,2006 Sandia Corporation, Kitware Inc.
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All rights reserved.
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ParaView is a free software; you can redistribute it and/or modify it
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under the terms of the ParaView license version 1.2.
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See License_v1.2.txt for the full ParaView license.
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A copy of this license can be obtained by contacting
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Kitware Inc.
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28 Corporate Drive
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Clifton Park, NY 12065
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USA
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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========================================================================*/
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#ifndef pqTriggerOnIdleHelper_h
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#define pqTriggerOnIdleHelper_h
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#include <QObject>
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#include <QPointer>
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#include "pqComponentsModule.h"
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#include "pqTimer.h"
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class pqServer;
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/// Often times we need to call certain slots on idle. However, just relying on
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/// Qt's idle is not safe since progress events often result in processing of
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/// pending events, which may not be a safe place for such slots to be called.
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/// In that such cases this class can be used. It emits the triggered() signal
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/// when the server (set using setServer()) is indeed idle. Otherwise it simply
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/// reschedules the triggering of another time.
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class PQCOMPONENTS_EXPORT pqTriggerOnIdleHelper : public QObject
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{
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Q_OBJECT
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typedef QObject Superclass;
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public:
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pqTriggerOnIdleHelper(QObject* parent=0);
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virtual ~pqTriggerOnIdleHelper();
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/// get the server
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pqServer* server() const;
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signals:
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void triggered();
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public slots:
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void setServer(pqServer*);
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void trigger();
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protected slots:
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void triggerInternal();
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private:
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Q_DISABLE_COPY(pqTriggerOnIdleHelper)
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QPointer<pqServer> Server;
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pqTimer Timer;
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};
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#endif
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