RE: The Window expose-event with gtk_window_resize() problem:

["Tom Liu" <tom liu flextrade com>]

Hi, 
I post the question week ago, still can't find the answer.
Can some one take a look and help me out this problem? I need this to be
done.
Thanks.
Tom.

> -----Original Message-----
> From: Tom Liu [mailto:tom liu flextrade com]
> Sent: Tuesday, July 06, 2004 11:55 AM
> To: 'Owen Taylor'; 'Jan-Marek Glogowski'
> Cc: 'gtk-app-devel-list gnome org'
> Subject: RE: The Window expose-event with gtk_window_resize() problem:
> 
> Set_double_buffered will bring another problem. If I put an label in
the
> window, when other windows covers this window and move away, the label
> will disappear!
> 
> Please try the following code.
>
//----------------------------------------------------------------------
--
> --
> #include "gtk/gtk.h"
> #include "stdio.h"
> 
> static gboolean expose(GtkWidget * widget, GdkEvent *event, gpointer
data)
> {
> 	int x,y,w,h;
> 	x=y=0;
> 	w=widget->allocation.width;
> 	h=widget->allocation.height;
>
fprintf(stderr,"Debug:%s,%d:expose:wid:%d,hi:%d,\n",__FILE__,__LINE_
> _,w,h);
> 
> 	gdk_window_clear(widget->window);// clear all this window;
> 	gdk_draw_rectangle(widget->window,(widget->style-
> >black_gc),false,5,5,w-10,h-10);
> 	return FALSE;
> }
> static gboolean press(GtkWidget * widget, GdkEvent *event, gpointer
data)
> {
> 	gtk_window_resize(GTK_WINDOW(widget),widget-
> >allocation.width+20,widget->allocation.height+20);
> //
gdk_window_resize(widget->window,widget->allocation.width+20,widget-
> >allocation.height+20);
> 	return FALSE;
> }
> 
> int main( int   argc, char *argv[] )
> {
> 	GtkWidget *window;
> 	GtkWidget *lbl;
> 	gtk_init (&argc, &argv);
> 	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> 	gtk_widget_set_app_paintable(window, TRUE);
> 	gtk_widget_set_double_buffered (window,false);
> 	gtk_widget_set_events(window,GDK_BUTTON_PRESS_MASK|
> 	GDK_EXPOSURE_MASK);
>     g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK
> (gtk_main_quit), NULL);
> 	g_signal_connect(G_OBJECT(window),"expose-
> event",G_CALLBACK(expose),NULL);
> 	g_signal_connect(G_OBJECT(window), "button_press_event",
> G_CALLBACK(press), NULL);
> 	gtk_container_set_border_width(GTK_CONTAINER(window),40);
> 	lbl=gtk_label_new("this is a label");
> 	gtk_widget_set_double_buffered (lbl,false);
> 	gtk_container_add(GTK_CONTAINER(window),lbl);
> 
> 
> 	gtk_widget_show_all(window);
> 	gtk_main ();
> 	return 0;
> 
> }
>
//----------------------------------------------------------------------
--
> 
> Thanks.
> Tom.
> 
> 
> 
> 
> > -----Original Message-----
> > From: Owen Taylor [mailto:otaylor redhat com]
> > Sent: Friday, July 02, 2004 3:25 PM
> > To: Jan-Marek Glogowski
> > Cc: Tom Liu; gtk-app-devel-list gnome org
> > Subject: RE: The Window expose-event with gtk_window_resize()
problem:
> >
> > On Sat, 2004-07-03 at 01:04, Jan-Marek Glogowski wrote:
> > > Hi
> > >
> > > I think there might be a problem in the "double buffering" code.
If
> you
> > > set
> > >
> > > gtk_widget_set_double_buffered( window, FALSE );
> > >
> > > you get single exposures.
> >
> > What's a single exposure?
> >
> > set_double_buffered (widget, FALSE) makes that widget *not*
> > double buffered. widgets are double buffered by default.
> >
> > 						Owen