Re: Problems with layout

[WDraxinger darkstargames de]

Try to put the Layout in a Viewport by using
gtk_scrolled_window_add_with_viewport(GTK_CONTAINER (scrolled_window), layout);

----- Original Message ----- 
From: "Eric THIERRY" <eric thierry finconsult fr>
To: <gtk-app-devel-list gnome org>
Sent: Thursday, February 21, 2002 1:05 PM
Subject: Problems with layout


> Hi there,
>
> I have two problems with gtk_layout.
>
> I create a layout that I add in a scrolled_window. Then I create some
> buttons that I put in the layout, and I draw rectangles in a callback
> function connected to the layout's expose event. For the moment,
> everything's OK.
>
> Now come the problems.
>
> First problem:
> When I scroll the scrolled_window, nothing happens. I have to resize my
> window (with the mouse) to see the scrolling effect, which means to see
> other buttons. (When I click on scrollbars arrows, the slider doesn't
> move, I have to click in the trough to move it: is that a clue ??)
>
> Second problem:
> When I resize my window, I no longer see my rectangles. I see them for a
> very short time in the increased portion of the window, but they
> disappear quickly. To see them again, I have to mask my window with an
> other one, or to iconify it and increase it. Do I have to use pixmap to
> solve this ?
>
> Thanks a lot.
>
> Here's my code (inspired from a book, but similar to what I need)
>
> #include <gtk/gtk.h>
> #include <windows.h>
> #include <stdio.h>
>
> gint HandleExposeEvent (GtkWidget * widget, GdkEventExpose * event)
> {
>  GtkLayout *layout;
>
>  gint i, j, imin, imax, jmin, jmax;
>
>  layout = GTK_LAYOUT (widget);
>  imin = (layout->xoffset + event->area.x) / 10;
>  imax = (layout->xoffset + event->area.x + event->area.width + 9) / 10;
>
>  jmin = (layout->yoffset + event->area.y) / 10;
>  jmax = (layout->yoffset + event->area.y + event->area.height + 9) / 10;
>
>  gdk_window_clear_area (widget->window, event->area.x, event->area.y,
>         event->area.width, event->area.height);
>
>  for (i=imin; i<imax; i++)
>  {
>   for (j=jmin; j<jmax; j++)
>    {
>     if ((i+j) % 2)
>      gdk_draw_rectangle (layout->bin_window, widget->style->black_gc,
> TRUE,
>           ((10*i) - layout->xoffset), ((10*j) - layout->yoffset),
>           1+i%10, 1+j%10);
>    }
>  }
>  return TRUE;
> }
>
>
>
> void GtkLayoutDialog ()
> {
>  GtkWidget *layout, *scrolled_window, * label, * dialog_window;
>  int i,j;
>  char buf[128];
>
>  dialog_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>  gtk_window_position (GTK_WINDOW (dialog_window), GTK_WIN_POS_MOUSE);
>  gtk_widget_set_usize (dialog_window, 200, 200);
>
>  gtk_signal_connect (GTK_OBJECT (dialog_window), "destroy",
> GTK_SIGNAL_FUNC (gtk_main_quit), &dialog_window);
>
>  scrolled_window = gtk_scrolled_window_new (NULL, NULL);
>  gtk_container_add (GTK_CONTAINER (dialog_window), scrolled_window);
>
>  layout = gtk_layout_new (NULL, NULL);
>  gtk_layout_set_size (GTK_LAYOUT (layout), 1600, 12800);
>
>  for (i=0; i<1600; i+=200)
>  {
>   for (j=0; j<12800; j+=200)
>    {
>     sprintf(buf, "%d %ld", i, j);
>     label = gtk_button_new_with_label (buf);
>     gtk_layout_put (GTK_LAYOUT (layout), label, i, j);
>    }
>  }
>
>  gtk_container_add (GTK_CONTAINER (scrolled_window), layout);
>
>  gtk_widget_set_events (layout, GDK_EXPOSURE_MASK );
>  gtk_signal_connect (GTK_OBJECT (layout), "expose_event",
> GTK_SIGNAL_FUNC (HandleExposeEvent), NULL);
>
>  gtk_widget_show_all (dialog_window);
> }
>
> int __stdcall WinMain ( struct HINSTANCE__ *hInstance,
>     struct HINSTANCE__ *hPrevInstance,
>     char       *lpszCmdLine,
>     int         nCmdShow)
> {
>
>  gtk_init (&__argc, &__argv);
>  GtkLayoutDialog ();
>  gtk_main ();
> }
>
> --
> Salutations,
>
> Eric THIERRY