<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, VTKers,<div><br></div><div>I am looking for a sample code to create a callback function to interact with QT's progress bar. In ITK, I usually do it in this way.</div><div><br></div><div>// The call back function</div><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "><span style="color: #b830a1">class</span> ShowProgressObject</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">{</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; color: rgb(184, 48, 161); ">public<span style="color: #000000">:</span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> ShowProgressObject()</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> {</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> m_Process = <span style="color: #b830a1">NULL</span>;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> m_progressBar = <span style="color: #b830a1">NULL</span>;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> m_accumulatedProgress = <span style="color: #2a35d6">0</span>;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> m_proportion = <span style="color: #2a35d6">1</span>;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">void</span> SetProcessObject( itk::<span style="color: #6f41a8">ProcessObject</span>* <span style="color: #6f41a8">o</span> ) { m_Process = <span style="color: #6f41a8">o</span>; }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">void</span> SetProgressBar( <span style="color: #6f41a8">QProgressBar</span>* <span style="color: #6f41a8">p</span> ) { m_progressBar = <span style="color: #6f41a8">p</span>; }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">void</span> SetAccumulatedProgress( <span style="color: #b830a1">double</span> ap ) { m_accumulatedProgress = ap; }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">void</span> SetProportion( <span style="color: #b830a1">double</span> <span style="color: #6f41a8">p</span> ) { m_proportion = <span style="color: #6f41a8">p</span>; }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">void</span> ShowProgress()</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> {</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">if</span>( m_progressBar )</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> {</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> m_progressBar-><span style="color: #3d2380">setValue</span>( m_accumulatedProgress + m_Process-><span style="color: #3d2380">GetProgress</span>() * <span style="color: #2a35d6">100</span> * m_proportion );</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #77482c">qApp</span>-><span style="color: #3d2380">processEvents</span>();</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> }</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> itk::<span style="color: #6f41a8">ProcessObject</span>::<span style="color: #6f41a8">Pointer</span> m_Process;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #6f41a8">QProgressBar</span>* m_progressBar;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">double</span> m_accumulatedProgress;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> <span style="color: #b830a1">double</span> m_proportion;</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">};</div></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">// register it with itk filter/io</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; color: rgb(111, 65, 168); "><span style="color: #000000">itk::</span>SimpleMemberCommand<span style="color: #000000"><</span><span style="color: #518187">ShowProgressObject</span><span style="color: #000000">>::</span>Pointer<span style="color: #000000"> command;</span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> command = itk::<span style="color: #6f41a8">SimpleMemberCommand</span><<span style="color: #518187">ShowProgressObject</span>>::<span style="color: #3d2380">New</span>();</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "><span class="Apple-tab-span" style="white-space:pre"> </span>command-><span style="color: #3d2380">SetCallbackFunction</span>(&progress,</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> &<span style="color: #518187">ShowProgressObject</span>::ShowProgress);</div><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px"><span class="Apple-tab-span" style="white-space:pre"> </span><br class="webkit-block-placeholder"></p><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "><span class="Apple-tab-span" style="white-space:pre"> </span>itkMetaImageReader-><span style="color: #3d2380">SetFileName</span>( <span style="color: #518187">inputFileName</span>.<span style="color: #3d2380">c_str</span>() );</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "><span class="Apple-tab-span" style="white-space:pre"> </span>itkMetaImageReader-><span style="color: #3d2380">AddObserver</span>( itk::<span style="color: #3d2380">ProgressEvent</span>(), command );</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; "> itkMetaImageReader-><span style="color: #3d2380">Update</span>();</div><div><br></div><div>May I know how I can implement the above similarly with vtkMetaImageReader in VTK+QT application?</div><div><br></div><div>Thank you very much.</div><div><br></div><div>Zhimin WANG, Ph.D.</div><div>Institute for Infocomm Research </div><div>A-STAR, Singapore</div><div> </div></div>
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