Hi John, On 2 July 2010 16:04, John Emmas <john...@tiscali.co.uk> wrote: > Now for the problem.... when in "playback" mode, I'd like the viewport to > have a vertical "now line" (similar to the play head on a tape recorder).
I doubt I count as brainy, but one simple technique would be to render the screen in layers. You would have an offscreen pixbuf with the current view, minus the now line. On an expose event, you copy the relevant parts of the offscreen buffer to the display, then draw the now line over that. Because of gtk's double-buffering, this will be flicker-free. To scroll 100 pixels to the right, you blit your offscreen buffer by 100 pixels, draw just the objects in the exposed area of pixels, then queue an expose for the whole widget. This means you have to handle all the scrolling yourself, but it's not so hard. Just connect your 'scroll by x pixels' function to the adjust signal on a scrollbar. If you need more speed (though I think it'd be quick enough on most machines) you'd probably need to use opengl. John _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
