https://www.slicer.org/w/index.php?action=history&feed=atom&title=Slicer%3ADeveloper_Meetings%3A20090916 2026-04-21T19:05:04Z Revision history for this page on the wiki MediaWiki 1.33.0 https://www.slicer.org/w/index.php?title=Slicer:Developer_Meetings:20090916&diff=10705&oldid=prev 2009-09-18T14:16:34Z

<p>Created page with &#039;== Goal == Discuss feasibility of migrating Slicer3 to use Qt widgets. Joint meeting with Kitware, agenda here: [http://www.na-mic.org/Wiki/index.php/Sept-2009-SlicerWidgetsBrai…&#039;</p> <p><b>New page</b></p><div>== Goal ==<br /> <br /> Discuss feasibility of migrating Slicer3 to use Qt widgets. Joint meeting with Kitware, agenda here: [http://www.na-mic.org/Wiki/index.php/Sept-2009-SlicerWidgetsBrainstorm Sept 2009 Slicer Widgets Brainstorm]<br /> <br /> == Attendees ==<br /> <br /> # Will Schroeder<br /> # Steve Pieper<br /> # Ron Kikinis<br /> # Nicole Aucoin<br /> # Alex Yarmarkovich (Wed only)<br /> # Sebastien Barre<br /> # JC Fillion<br /> # Katie Hayes<br /> # Andriy Fedorov<br /> # Junichi Tokuda (Thu only) <br /> <br /> == Rough Notes ==<br /> <br /> &lt;pre&gt;<br /> Wed Sept 16/09<br /> - Qt meeting with Kitware<br /> General<br /> - need to demonstrate better usability<br /> - cmtk is qt based widget ste, general gui widgets, but separate library to compile. Should focus on Slicer stuff.<br /> - medInria is being re-written (includes a software self updater)<br /> - paraview some widgets are autogenerated<br /> - automated testing: squish works with Qt, used at Kitware<br /> Qt:<br /> - slot: does things (proc, method)<br /> - signal: something changed<br /> - connect signal that x changed to slot to do something with that info<br /> - cmake provides a QObject wrapper, Qt meta object compiler (MOC) to wrap Qt to C++<br /> - vtk can call Qt slot, uses the Connect method on vtkEventQtSlotConnect class<br /> - Qt can connect signal and slot that can interact with vtk objects<br /> - Qt global window keeps track of all signals (Qt connect) via the Qt event loop<br /> Qt Designer and Qt creator:<br /> - writes xml file to disk, translated to ui_MyWidget.h (which is not a qObject)<br /> - the meta object compiler can compile ui files to .h files<br /> - can drop in custom qt widgets (Promoted Class) or Qt designer plugin (see Maverick qt qwidgets that have been contributed as open souce at http://www.vtk.org/wiki/Maverick)<br /> - can overload paint event to change the icons at pixel level (changed the range slider trough appearance in the example)<br /> - Qt can apply a style and keep it the same across all platforms; debate if we wan to do this<br /> - Canvas to draw UI with lines, rectangles, textures<br /> - can block a signal to do the equivalent of swallowing a vtk event<br /> - Qt can be compiled multithreaded<br /> - remove gui events and move to Qt<br /> - kwsys versus Qt sys<br /> - on the Mac: vtk carbon render window, can't coexist with TK, cocoa looks bad<br /> - there will be a tutorial on Qt development at the winter project week<br /> - looking at Slicer<br /> - recurring bug, the checkerboard filter node sel cuts off to the last letter of the node name<br /> - get signal if user moves slider, not if set the value of a slider programatically<br /> - if want other qt widgets to respond, need to observe what triggered the set value call (verify this) aka change to a mrml node<br /> - if we could just listen for signals (wrap vtk with Qt), easier<br /> - memory management: make sure to use vtk smart pointers, don't need to delete Qt objects<br /> - start at 8am tomorrow<br /> <br /> Thur Sept 17/09<br /> Kitware meeting about Qt<br /> - JC did a proof of concept architecture for using Qt<br /> - separate out nodes (each qt module will have a vtkmrmlnode as a superclass pointer, safe down cast to it's specific one): widget passes editing to module which edits the node<br /> - tcl modules<br /> - translate them to python?<br /> - what about scripted modules?<br /> - python goes through tcl<br /> - tcl access to vtk obj -&gt; vtk wrap tcl<br /> - tcl access to qt -&gt; python<br /> - current work<br /> - Seb making new cameras and windows, merging code, lowest time estimate to be done, 10 days<br /> - try to wait for him to get the mrml level stuff done before chaning the3d window UI on him<br /> - Wendy's customisable layout is paused while the Qt storm rages<br /> - conversion of specific things to Qt<br /> - toolbar:<br /> - layout options that we want first? conventional, four up, red only, compare view... pretty much all of them<br /> - most of the buttons just jump to modules<br /> - Qt colours<br /> - can add custom colours, how about sets of them?<br /> - drop down box to selet colour from a list<br /> - log: KWQtLogDialog<br /> - multi column list: QtPropertyBrowser, can view as List, Tree, Table<br /> - can have table and tree combined in one view<br /> - Qt has undo/redo<br /> - icons -&gt; resouce editor in Qt creator<br /> - naming conventions<br /> - qSlicer<br /> - onEventChanged<br /> - Qt training?<br /> - trolltech docs for getting started<br /> - Qt module skeleton generator will be important, write out an xml file and cxx<br /> - for January, ahve something for developers to work on, by summer, transition to Qt<br /> - examples checked in to Base/GUI2?<br /> - Jim Miller to rewrite CLI generator?<br /> - Steve thinks anyone could do it<br /> - benefits list on wiki somewhere so can add to it<br /> - undo in slicer, add a string with the node on the call to the mrml scene<br /> - Qt web plug in demo<br /> - any qt slot is a java script method<br /> - see Base/GUI/Qt/vtkview.cxx<br /> - so can write html with calls to vtk and mrml (via KW applicatin and Script call)<br /> - write live tutorials - overlay on buttons to show which to press<br /> - allow writing CLI in javascript but don't encourage/support it<br /> - simple ui for work in developing countries<br /> - Steve to go to Chapel Hill for more work with JC<br /> - action items for Slicer core devs: do Qt tutorial, get slicer building with Qt<br /> &lt;/pre&gt;</div>

Nicole