HeapScroller.OnExposeEvent C# (CSharp) Méthode

    protected override bool OnExposeEvent(Gdk.EventExpose args)
    {
        if (bitmap_cache == null) {
            bitmap_cache = new Gdk.Pixmap (GdkWindow, background.Width, background.Height, -1);
            bitmap_cache.DrawRectangle (Style.WhiteGC, true, 0, 0,
                background.Width, background.Height);

            using (Graphics g = Gtk.DotNet.Graphics.FromDrawable (bitmap_cache)) {
                Plot (g);
            }
        }

        GRect area;
        if (args.Area.Intersect (background, out area))
            GdkWindow.DrawRectangle (Style.BaseGC (State), true, area);

        GdkWindow.DrawDrawable (Style.BlackGC,
                        bitmap_cache,
                        0, 0,
                        background.X, background.Y,
                        background.Width, background.Height);

        Style.PaintShadow (this.Style, GdkWindow, State, ShadowType.In, area,
                   this, null, background.X, background.Y,
                   background.Width, background.Height);

        if (glass != null) {
            glass.Draw (args.Area);
        }

        return base.OnExposeEvent (args);
    }