[Gtk-sharp-list] Exposes Constantly

Adam Tauno Williams adam at morrison-ind.com
Thu Dec 13 09:22:04 EST 2007

I'm creating a widget in Gtk# which contains a Drawing area.  When an
expose event occurs I create a Cairo context from the Gdk Window of the
drawing area and I draw on it.  It is working well, but the Expose event
seems to fire *CONSTANTLY* so the Widget just sits there soaking up
nearly an entire core.  The window isn't being moved or resized and
nothing is passing over the widget.  Am I missing something?

Possibly the issue is because the drawing area is scrollable? (Even
though it isn't being scrolled).

The expose even of the drawing area is linked to -
protected virtual void OnAreaExposeEvent (object o, Gtk.ExposeEventArgs
      Draw ();

And Draw just creates the Cairo context and draws on it.

public void Draw ()
  Console.WriteLine("Draw: (width={0},height={0})", width, height);   
  cairo = Gdk.CairoHelper.Create (area.GdkWindow);
  ((IDisposable) cairo.Target).Dispose();
  (IDisposable) cairo).Dispose ();

I see the "Draw: ... " message non-stop.

This is the first time I've used DrawingArea or Cairo as I'm not a
graphics guy at all,  but I really need a weekview calendar widget for
Gtk# and none seem to be available.   So far Cairo seems very nice to
use, and fast;  I've been able to draw hour lines and day columns,
etc...  but the documentation on some of the gritty details is rather

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