Hi,
A few days ago I decided to learn mono and gtk#. I wanted to write a
simple widget that looks like libnotify widgets just bigger. But when
I tried to add widgets like a button to the window I couldn't see
anything but the white background and the colored stripe I have drawn
on the window using the expose event.
I'm going to cut things short and show you the code:
using System;
using Gtk;
using Cairo;
public class MainWindow : Gtk.Window
{
public MainWindow (): base (Gtk.WindowType.Popup)
{
this.SetSizeRequest(400, 400);
this.Show();
this.AppPaintable = true;
Gtk.Button b = new Gtk.Button("test");
b.SetSizeRequest(20,20);
this.Add(b);
this.ExposeEvent += Expose;
this.ShowAll();
}
public void Expose(object o, Gtk.ExposeEventArgs args)
{
Cairo.Context cr = Gdk.CairoHelper.Create(this.GdkWindow);
cr.Operator = Cairo.Operator.Source;
Cairo.Surface surface =
cr.Target.CreateSimilar(Cairo.Content.ColorAlpha, 400, 400);
Cairo.Context crs = new Cairo.Context(surface);
//FillBackground
Gtk.Style stl = this.Style;
Gdk.Color background = stl.Base(Gtk.StateType.Normal);
crs.Color = new Cairo.Color( background.Red / 65535.0,
background.Green / 65535.0, background.Blue / 65535.0);
crs.Rectangle( 0, 0, 400, 400);
crs.Fill();
crs.Color = new Cairo.Color(0.0,0.0,0.0);
crs.LineWidth = 1.0;
crs.Rectangle(0.5,0.5,400-0.5,400-0.5);
crs.Stroke();
//draw stripe
double strx = 1.5;
double stry = 1.5;
crs.Color = new Cairo.Color(0.3,0.3,0.3);
crs.Rectangle(strx,stry,40, 397);
crs.Fill();
cr.SetSourceSurface(surface,0,0);
cr.PaintWithAlpha(0.8);
}
}
class MainClass
{
public static void Main (string[] args)
{
Application.Init ();
MainWindow win = new MainWindow ();
Application.Run ();
}
}
That's the important stuff. Now I checked the theme.c from
notification-daemon (galago project) and the c code looks roughly the
same with the exception that the widgets obviosly DON'T get painted
over when the expose event is triggered. As you can see I used the
paint method PaintWithAlpha so that it is possible to actually see the
widgets below.
My question finally is: Why does mono behave differently here than the
c code? After all notification-daemon also repaints at every expose
event but no widget is ever hidden.
Any help would be greatly appreciated.
Martin Schanzenbach
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