Walter Leibbrandt wrote: > Hi, > > I took another swing at creating a custom cell renderer that can render > any arbitrary widget in a TreeView. It currently works, albeit with a > few annoyances. The source is available at > https://translate.svn.sourceforge.net/svnroot/translate/src/trunk/virtaal/virtaal/views/widgets/cellrendererwidget.py > > The widget (retrieved from the TreeView's model) is rendered by wrapping > it in a gtk.CellEditable, which was the only way I could find to render > arbitrary widgets. This means that the cell renderer must use the > editable mode and that the activatable mode is of no use. So the cell is > currently rendered in one of three states: > * Unselected: A CellRendererText is emulatedwith the strfunc callable > supplying the string to render. > * Selected (not editing): When selecting a row (with the mouse or > keyboard) the cell is empty. Neither the string or the widget is rendered. > * Editing: When clicking on the cell (or pressing Enter on it) after it > has been selected it enters editing mode and displays the appropriate > widget. > > The problem is the second state mentioned above and that brings me to my > actual question: How can I get CellRenderer to enter editing mode as > soon as it is selected? > > I have tried testing the flags parameter (in on_render) for > gtk.CELL_RENDERER_SELECTED and then calling self.start_editing() myself. > I have confirmed that my on_start_editing() is indeed called, but that > does not seem to be enough to put the cell in editing mode and show the > widget. > > This is has been solved in Virtaal (the application I'm working on), but > it involved creating a custom TreeModel implementation. This model would > return True for get_value() calls on the (hard-coded) column number of > the editable property, only if the internal iterator matched the > get_value() call's parameter. This is a big hack I'd like to avoid in my > implementation. For this implementation the CellRenderer is in > https://translate.svn.sourceforge.net/svnroot/translate/src/trunk/virtaal/virtaal/views/widgets/storeviewwidgets.py > > and the CellEditable is in > https://translate.svn.sourceforge.net/svnroot/translate/src/trunk/virtaal/virtaal/views/unitview.py > > Any insight would be greatly appreciated. > > Thanks in advance, > > I've got it working with a hack, but one important problem remains: The CellRenderer's size is calculated based on the string rendered for unselected cells. This means that, if the widget rendered in a selected cell needs more space than the rendered string, it is simply cut off. The problem (as far as I can tell) seems to arise from the fact that the widget to render in the cell has not yet been realize()d and thus has no allocation.
So this is a call to anyone who has implemented a custom cell renderer's do_get_size() to please take a look at the code and make any recommendations and/or observations that might help me calculate the correct size for the cell. The code is at https://translate.svn.sourceforge.net/svnroot/translate/src/trunk/virtaal/virtaal/views/widgets/cellrendererwidget.py Thanks in advance, -- Walter Leibbrandt Software Developer Recent blogs: * Conquering the CellRendererWidget http://www.translate.org.za/blogs/walter/en/content/conquering-cellrendererwidget _______________________________________________ pygtk mailing list pygtk@daa.com.au http://www.daa.com.au/mailman/listinfo/pygtk Read the PyGTK FAQ: http://faq.pygtk.org/
