I figured out what I needed, but it was bizarrely difficult. I first had to use gtk_bin_get_child on the scrolled window to get the viewport; then I had to use gdk_window_get_position() on viewport->bin_window to get the (negative) x and y coordinates of the visible region, then gdk_window_get_size() on viewport->view_window to get the width and height of the visible region. There *must* be a better way do get this information, but damned if I can find it.....this just seems too useful to make it so obscure to locate. ----- Original Message ----- From: Lindley M French <lfrench1@xxxxxxx> Date: Wednesday, May 21, 2008 10:14 am Subject: Getting the visible portion of a scrolled window > I've got a scrolled window containing an OpenGL-enabled drawing > area, and I'm trying to implement drag-selection of OpenGL- > rendered items. > > This works just fine so long at the entire area I'm selecting is > within the drawing area. However, if it isn't, the program crashes > because I can't control what's drawn there. > > Since the selection only includes a draw to the GL_BACK buffer and > no visible render, I'm not sure why the program can't draw there > just because that part of the window is "hidden" (scrolled away), > but let's not worry about that for now. > > What I'd like to do is limit the size of my drag-box to the > currently visible area. This works fine if my scrolled window has > no scroll bars and is completely visible; I can easily limit > myself to the bounds of the most recent configure event on the > drawing area. > > But how can I get the visible area of a scrolled window when it's > only partially visible, and scroll bars exist? There must be a way > to do it; *something* knows which part of the child to draw. > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list > _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
