El mi�, 03-09-2003 a las 21:34, Abel Daniel escribi�:
> Hi!
>
> As a beginner pygtk user, I'm trying to make a TreeView which has
> multi-line cells. Each node would contain about 1-4 lines of text. If
> I were to use a gtk.CellRendererText, only 1 line would be visible,
> and the user would have to scroll horizontally to see the rest of the
> text. I want the full text to be visible, by having it wrap if it is
> more than one line.
>
> The best solution would be using a TextView as a CellRenderer. But it
> looks like normal widgets can't be used like that. (Is there a reason
> for this? One would think that CellRenderers would be very similar to
> normal widgets.)
>
> So I guess my best bet is making a custom CellRenderer. I thought
> something like this would work:
>
> ---8<--------
> import pygtk
> pygtk.require('2.0')
>
> import gtk
> import gobject
> import pango
>
> class MyCellRenderer(gtk.GenericCellRenderer):
> def __init__(self):
> self.__gobject_init__()
> def on_render(self, window, widget, background_area,
> cell_area, expose_area, flags):
> context = widget.get_pango_context()
> layout = pango.Layout(context)
> layout.set_text(long_string)
> layout.set_wrap(gtk.WRAP_CHAR)
> layout.set_width(cell_area.width)
> widget.style.paint_layout(window, gtk.STATE_NORMAL, gtk.TRUE,
> cell_area, widget, 'footext',
> cell_area.x, cell_area.y,
> layout)
>
> def on_get_size(self, widget, cell_area):
> return 0,0,100,100 # return something big enough
>
> gobject.type_register(MyCellRenderer)
>
> class Tree(gtk.TreeView):
> def __init__(self):
> self.store = gtk.ListStore(gobject.TYPE_STRING,
> gobject.TYPE_PYOBJECT)
> gtk.TreeView.__init__(self)
> self.set_size_request(300, 200)
> self.set_model(self.store)
> self.set_headers_visible(gtk.TRUE)
>
> rend = gtk.CellRendererText()
> column = gtk.TreeViewColumn('First', rend, text=0)
> self.append_column(column)
>
> rend = MyCellRenderer()
> column = gtk.TreeViewColumn('Second', rend)
> self.append_column(column)
>
> def insert(self, name):
> iter = self.store.append()
> self.store.set(iter,
> 0, name)
>
> long_string="""long-long string for testing asdf asdf asdf asdf adsf asdf asdf
> asdasdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
> """
> w = gtk.Window()
> w.set_position(gtk.WIN_POS_CENTER)
> w.connect('delete-event', gtk.mainquit)
> t = Tree()
> t.insert('baz')
> w.add(t)
> w.show_all()
> gtk.main()
>
> ---8<-----------
>
> The immedate problem is that layout.set_width() apparently expects
> something other than pixels. If I do layout.set_width(200000),
> get_pixel_size() will return a width of 195 pixels. I couldn't find
> anything in the documentation about the units set_width() expects or
> how to convert number of pixels to it.
> Where is this documented, and how could I handle the conversion?
>
> Even if I somehow manage to convert pixels to this unit system, I will
> have another problem:
> I want the width of the text to adjust to the width of the TreeView
> widget. The height of the text should adjust to the amount of text in
> that given node. The problem is, that as I understand it, the
> CellRenderer has to calculate the size needed in on_get_size(). But I
> couldn't find a way to get the size of the TreeWidget (or rather, the
> size left for the cell after indentation, the little icon showing
> expandedness, etc.) in that method. cell_area is None there. I can
> access the width of the cell from on_render(), (it seems to be
> cell_area.width) but I don't see a way to change the height of the
> cell there.
I think you should check if cell_area is None in your on_get_size()
method because IIRC only the first time that is called it is None. I
don't know why btw.
Maybe this link can help you:
http://www.daa.com.au/pipermail/pygtk/2003-January/004239.html
It is a custom cell renderer implemented by one of the PyGTK masters
Regards
Lorenzo Gil Sanchez
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