implement Progressive image loader

and part of the stock browser

svn path=/trunk/gtk-sharp/; revision=32053

sample/GtkDemo/DemoImages.cs

@@ -37,6 +37,7 @@ namespace GtkDemo
 	{
 		private static Gtk.Image progressiveImage;
 		private VBox vbox;
+		BinaryReader imageStream;
 
 		public DemoImages () : base ("images")
 		{
@@ -133,20 +134,30 @@ namespace GtkDemo
 		 * The timeout simply simulates a slow data source by inserting
 		 * pauses in the reading process.
 		 */
-			timeout_id = GLib.Timeout.Add(150, new GLib.TimeoutHandler(ProgressiveTimeout));
+			timeout_id = GLib.Timeout.Add (150, new GLib.TimeoutHandler (ProgressiveTimeout));
 		}
 
 		static Gdk.PixbufLoader pixbufLoader;
 
-		// TODO: Finish this callback
-		// Decide if we want to perform crazy error handling
-		private  bool ProgressiveTimeout()
+		// TODO: Decide if we want to perform crazy error handling
+		private  bool ProgressiveTimeout ()
 		{
-			Gtk.Image imageStream = new Gtk.Image ("images/alphatest.png");
-			pixbufLoader = new Gdk.PixbufLoader ();
-			pixbufLoader.AreaPrepared += new EventHandler (ProgressivePreparedCallback);
-			pixbufLoader.AreaUpdated += new AreaUpdatedHandler (ProgressiveUpdatedCallback);
-			return true;
+			if (imageStream == null) {
+				imageStream = new BinaryReader (new StreamReader ("images/alphatest.png").BaseStream);
+				pixbufLoader = new Gdk.PixbufLoader ();
+				pixbufLoader.AreaPrepared += new EventHandler (ProgressivePreparedCallback);
+				pixbufLoader.AreaUpdated += new AreaUpdatedHandler (ProgressiveUpdatedCallback);
+			}
+
+			if (imageStream.PeekChar () != -1) {
+				byte[] bytes = imageStream.ReadBytes (256);
+				pixbufLoader.Write (bytes, (uint) bytes.Length);
+				return true; // leave the timeout active
+			}
+			else {
+				imageStream.Close ();
+				return false; // removes the timeout
+			}
 		}
 
 		static void ProgressivePreparedCallback (object obj, EventArgs args) 
@@ -158,7 +169,7 @@ namespace GtkDemo
 
 		static void ProgressiveUpdatedCallback (object obj, AreaUpdatedArgs args) 
 		{
-
+			progressiveImage.QueueDraw ();
 		}
 	}
 }

sample/GtkDemo/DemoStockBrowser.cs

@@ -30,7 +30,10 @@ namespace GtkDemo
 			list.AppendColumn ("Name", new CellRendererText (), "text", 1);
 			list.AppendColumn ("Label", new CellRendererText (), "text", 2);
 			list.AppendColumn ("Accel", new CellRendererText (), "text", 3);			
+			list.AppendColumn ("ID", new CellRendererText (), "text", 4);			
 			list.Model = CreateStore ();
+
+			list.Selection.Changed += new EventHandler (OnSelectionChanged);
 			scrolledWindow.Add (list);
 			
 			Frame frame = new Frame ();
@@ -41,17 +44,38 @@ namespace GtkDemo
 
 		private ListStore CreateStore ()
 		{
-			// image, name, label, accel
-			ListStore store = new Gtk.ListStore (typeof (Gdk.Pixbuf), typeof(string), typeof(string), typeof(string));
-			
-			for (int i =1; i < 10; i++)
+			// image, name, label, accel, id
+			ListStore store = new Gtk.ListStore (typeof (Gdk.Pixbuf), typeof(string), typeof(string), typeof(string), typeof (string));
+
+			string[] stock_ids = Gtk.Stock.ListIds ();		
+
+			foreach (string s in stock_ids)
 			{
-			Image icon = new Image ("images/MonoIcon.png");
-			store.AppendValues (icon, "Gtk.Stock.Ok", "Ok", "_Ok");
+				Gtk.StockItem si;
+				/* Gtk.Stock.Lookup is not being generated
+				if (Gtk.Stock.Lookup (out si)) {
+					Image icon = new Image (s, IconSize.Menu);
+					store.AppendValues (si.Pixbuf, si.Label, "Ok", "_Ok", si.StockId);
+				}
+				else {
+					Console.WriteLine ("StockItem {0} could not be found.", s);
+				}
+				*/
 			}
 			
 			return store;
 		}
+
+		void OnSelectionChanged (object o, EventArgs args)
+		{
+			TreeIter iter;
+			TreeModel model;
+
+			if (((TreeSelection) o).GetSelected (out model, out iter))
+			{
+				// update the frame
+			}
+		}
 		
   		private void WindowDelete (object o, DeleteEventArgs args)
 		{

sample/GtkDemo/TODO

@@ -9,7 +9,7 @@ DemoIconFactory
  - almost everything
 
 DemoImages
- - fix the progressive loading image
+ - improve the Progressive Image loading and error handling
 
 DemoStockBrowser
  - almost everything