Re: [gtk-list] Backing Pixmap woes with frames

[bratsche dfw net]

If you create a GtkPixmap, you can just do gtk_container_add() to the
frame and save yourself some trouble.

Cody

On Sat, 24 Apr 1999 Robert_Gasch/PeopleSoft@peoplesoft.com wrote:

> 
> 
> Hi,
> 
> I'm trying to add drawing area with a backing pixmap
> to a window I'm building, but am running into trouble:
> 
> > Gdk-CRITICAL **: file gdkpixmap.c: line 62 (gdk_pixmap_new):
> > assertion `(window != NULL) || (depth != -1)' failed.
> > Gdk-CRITICAL **: file gdkdraw.c: line 89 (gdk_draw_rectangle):
> > assertion `drawable != NULL' failed.
> 
> The backing pixmap is built as follows:
>      d_pixmap = gdk_pixmap_new(get_window(), x, y, -1);
> 
> I've used this code in a few other modules before without
> any problems. Now though I try to add the drawing area
> to a frame, and it seems that the gdk_pixmap_new() is failing,
> specifically get_window() seems to return NULL.
> 
> Here's a quick rundown on what I'm doing:
>      d_previewFrame = new Gtk_Frame ();
>      d_vBoxPreview.pack_start (*d_previewFrame, FALSE, FALSE, 0);
>      d_previewGroupFrame = new Gtk_Frame ("Preview");
>      d_previewGroupFrame->add (d_vBoxPreview);
> 
>      // GuiBufferedDrawingArea allocats the DA and backing pixmap
>      d_drawArea = new GuiBufferedDrawingArea ();
>      d_previewFrame->add (*d_drawArea);
> 
> So far so good, but when I try to do a
>      d_drawArea.setUsize (sx, sy);
> (which in fact only destroys to old pixmap, creates a new one (see
> statement above) and resizes the drawing area), I get the 2 Gdk-CRITICAL
> errors above.
> 
> Is there anything special that I must know/remember when using frames
> instead of adding a drawing area to a vBox directly?
> 
> Thanks
> -> Robert
> 
> 
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