sample: Port all existing GtkDemo samples to the new APIs

The following samples crash because of an issue with the new Drawn
handler: ColorSelection, DrawingArea and Pixbuf.
The rest seem to work OK.

sample/GtkDemo/DemoApplicationWindow.cs

@@ -192,7 +192,7 @@ namespace GtkDemo
 		protected override bool OnWindowStateEvent (Gdk.EventWindowState evt)
 		{
 			if ((evt.ChangedMask & (Gdk.WindowState.Maximized | Gdk.WindowState.Fullscreen)) != 0)
-				statusbar.HasResizeGrip = (evt.NewWindowState & (Gdk.WindowState.Maximized | Gdk.WindowState.Fullscreen)) == 0;
+				HasResizeGrip = (evt.NewWindowState & (Gdk.WindowState.Maximized | Gdk.WindowState.Fullscreen)) == 0;
 			return false;
 		}
 

sample/GtkDemo/DemoColorSelection.cs

@@ -14,7 +14,7 @@ namespace GtkDemo
 	[Demo ("Color Selection", "DemoColorSelection.cs")]
 	public class DemoColorSelection : Gtk.Window
 	{
-		private Gdk.Color color;
+		private Gdk.RGBA color;
 		private Gtk.DrawingArea drawingArea;
 
 		public DemoColorSelection () : base ("Color Selection")
@@ -30,19 +30,22 @@ namespace GtkDemo
 			vbox.PackStart (frame, true, true, 0);
 
 			drawingArea = new DrawingArea ();
-			drawingArea.ExposeEvent += new ExposeEventHandler (ExposeEventCallback);
+			drawingArea.Drawn += new DrawnHandler (DrawnCallback);
 			// set a minimum size
 			drawingArea.SetSizeRequest (200,200);
 			// set the color
-			color = new Gdk.Color (0, 0, 0xff);
-			drawingArea.ModifyBg (StateType.Normal, color);
+			color.Red = 0;
+			color.Green = 0;
+			color.Blue = 1;
+			color.Alpha = 1;
+			drawingArea.OverrideBackgroundColor (StateFlags.Normal, color);
 			frame.Add (drawingArea);
 
 			Alignment alignment = new Alignment (1.0f, 0.5f, 0.0f, 0.0f);
 			Button button = new Button ("_Change the above color");
 			button.Clicked += new EventHandler (ChangeColorCallback);
 			alignment.Add (button);
-			vbox.PackStart (alignment);
+			vbox.PackStart (alignment, false, false, 0);
 
 			ShowAll ();
 		}
@@ -53,17 +56,15 @@ namespace GtkDemo
 			return true;
 		}
 
-		// Expose callback for the drawing area
-		private void ExposeEventCallback (object o, ExposeEventArgs args)
+		// Drawn callback for the drawing area
+		private void DrawnCallback (object o, DrawnArgs args)
 		{
-			EventExpose eventExpose = args.Event;
-			Gdk.Window window = eventExpose.Window;
- 			Rectangle area = eventExpose.Area;
+			Cairo.Context cr = args.Cr;
+			
+			Gdk.RGBA rgba = StyleContext.GetBackgroundColor (StateFlags.Normal);
+			cr.SetSourceRGBA (rgba.Red, rgba.Green, rgba.Blue, rgba.Alpha);
+			cr.Paint ();
 
-			window.DrawRectangle (drawingArea.Style.BackgroundGC (StateType.Normal),
-					      true,
-					      area.X, area.Y,
-					      area.Width, area.Height);
 			args.RetVal = true;
 		}
 
@@ -71,13 +72,13 @@ namespace GtkDemo
 		{
 			using (ColorSelectionDialog colorSelectionDialog = new ColorSelectionDialog ("Changing color")) {
 				colorSelectionDialog.TransientFor = this;
-				colorSelectionDialog.ColorSelection.PreviousColor = color;
-				colorSelectionDialog.ColorSelection.CurrentColor = color;
+				colorSelectionDialog.ColorSelection.SetPreviousRgba (color);
+				colorSelectionDialog.ColorSelection.CurrentRgba = color;
 				colorSelectionDialog.ColorSelection.HasPalette = true;
 
 				if (colorSelectionDialog.Run () == (int) ResponseType.Ok) {
-					Gdk.Color selected = colorSelectionDialog.ColorSelection.CurrentColor;
-					drawingArea.ModifyBg (StateType.Normal, selected);
+					Gdk.RGBA selected = colorSelectionDialog.ColorSelection.CurrentRgba;
+					drawingArea.OverrideBackgroundColor (StateFlags.Normal, selected);
 				}
 
 				colorSelectionDialog.Hide ();

sample/GtkDemo/DemoDialog.cs

@@ -94,7 +94,7 @@ namespace GtkDemo
 
 			HBox hbox = new HBox (false, 8);
 			hbox.BorderWidth = 8;
-			dialog.VBox.PackStart (hbox, false, false, 0);
+			dialog.ContentArea.PackStart (hbox, false, false, 0);
 
 			Image stock = new Image (Stock.DialogQuestion, IconSize.Dialog);
 			hbox.PackStart (stock, false, false, 0);

sample/GtkDemo/DemoDrawingArea.cs

@@ -22,7 +22,7 @@ namespace GtkDemo
 	[Demo ("Drawing Area", "DemoDrawingArea.cs")]
 	public class DemoDrawingArea : Gtk.Window
 	{
-		private Pixmap pixmap = null;
+		private Cairo.Surface surface = null;
 
 		public DemoDrawingArea () : base ("Drawing Area")
 		{
@@ -45,7 +45,7 @@ namespace GtkDemo
 			// set a minimum size
 			da.SetSizeRequest (100,100);
 			frame.Add (da);
-			da.ExposeEvent += new ExposeEventHandler (CheckerboardExpose);
+			da.Drawn += new DrawnHandler (CheckerboardDrawn);
 
 			// Create the scribble area
 			label = new Label ("<u>Scribble area</u>");
@@ -62,7 +62,7 @@ namespace GtkDemo
 			frame.Add (da);
 
 			// Signals used to handle backing pixmap
-			da.ExposeEvent += new ExposeEventHandler (ScribbleExpose);
+			da.Drawn += new DrawnHandler (ScribbleDrawn);
 			da.ConfigureEvent += new ConfigureEventHandler (ScribbleConfigure);
 
 			// Event signals
@@ -84,25 +84,21 @@ namespace GtkDemo
 			return true;
 		}
 
-		private void CheckerboardExpose (object o, ExposeEventArgs args)
+		private void CheckerboardDrawn (object o, DrawnArgs args)
 		{
 			const int CheckSize = 10;
 			const int Spacing = 2;
 
-			DrawingArea da = o as DrawingArea;
-
-			// It would be a bit more efficient to keep these
-			// GC's around instead of recreating on each expose, but
-			// this is the lazy/slow way.
-			Gdk.GC gc1 = new Gdk.GC (da.GdkWindow);
-			gc1.RgbFgColor = new Gdk.Color (117, 0, 117);
-
-			Gdk.GC gc2 = new Gdk.GC (da.GdkWindow);
-			gc2.RgbFgColor = new Gdk.Color (255, 255, 255);
+			Widget widget = o as Widget;
+			Cairo.Context cr = args.Cr;
 
 			int i, j, xcount, ycount;
-			Gdk.Rectangle alloc = da.Allocation;
 
+			// At the start of a draw handler, a clip region has been set on
+			// the Cairo context, and the contents have been cleared to the
+			// widget's background color.
+			
+			Rectangle alloc = widget.Allocation;
 			// Start redrawing the Checkerboard
 			xcount = 0;
 			i = Spacing;
@@ -110,13 +106,12 @@ namespace GtkDemo
 				j = Spacing;
 				ycount = xcount % 2; // start with even/odd depending on row
 				while (j < alloc.Height) {
-					Gdk.GC gc;
 					if (ycount % 2 != 0)
-						gc = gc1;
+						cr.SetSourceRGB (0.45777, 0, 0.45777);
 					else
-						gc = gc2;
-					da.GdkWindow.DrawRectangle (gc, true, i, j,
-								    CheckSize, CheckSize);
+						cr.SetSourceRGB (1, 1, 1);
+					// If we're outside the clip, this will do nothing.
+					cr.Rectangle (i, j, CheckSize, CheckSize);
 
 					j += CheckSize + Spacing;
 					++ycount;
@@ -130,33 +125,29 @@ namespace GtkDemo
 			args.RetVal = true;
 		}
 
-		private void ScribbleExpose (object o, ExposeEventArgs args)
+		private void ScribbleDrawn (object o, DrawnArgs args)
 		{
-			Widget widget = o as Widget;
-			Gdk.Window window = widget.GdkWindow;
- 			Rectangle area = args.Event.Area;
-
-			// We use the "ForegroundGC" for the widget since it already exists,
-			// but honestly any GC would work. The only thing to worry about
-			// is whether the GC has an inappropriate clip region set.
-			window.DrawDrawable (widget.Style.ForegroundGC (StateType.Normal),
-					     pixmap,
-					     area.X, area.Y,
-					     area.X, area.Y,
-					     area.Width, area.Height);
+			Cairo.Context cr = args.Cr;
+			
+			cr.SetSourceSurface (surface, 0, 0);
+			cr.Paint ();
 		}
 
-		// Create a new pixmap of the appropriate size to store our scribbles
+		// Create a new surface of the appropriate size to store our scribbles
 		private void ScribbleConfigure (object o, ConfigureEventArgs args)
 		{
 			Widget widget = o as Widget;
-			Rectangle allocation = widget.Allocation;
+			
+			if (surface != null)
+				surface.Destroy ();
 
-			pixmap = new Pixmap (widget.GdkWindow, allocation.Width, allocation.Height, -1);
+			var allocation = widget.Allocation;
 
-			// Initialize the pixmap to white
-			pixmap.DrawRectangle (widget.Style.WhiteGC, true, 0, 0,
-					      allocation.Width, allocation.Height);
+			surface = widget.Window.CreateSimilarSurface (Cairo.Content.Color, allocation.Width, allocation.Height);
+			var cr = new Cairo.Context (surface);
+			
+			cr.Paint ();
+			((IDisposable)cr).Dispose ();
 
 			// We've handled the configure event, no need for further processing.
 			args.RetVal = true;
@@ -166,7 +157,7 @@ namespace GtkDemo
 		{
 
 			// paranoia check, in case we haven't gotten a configure event
-			if (pixmap == null)
+			if (surface == null)
 				return;
 
 			// This call is very important; it requests the next motion event.
@@ -192,19 +183,21 @@ namespace GtkDemo
 		// Draw a rectangle on the screen
 		private void DrawBrush (Widget widget, double x, double y)
 		{
-			Rectangle update_rect = new Rectangle ((int)x - 3, (int)y - 3, 6, 6);
+			var update_rect = new Gdk.Rectangle ((int)x - 3, (int)y - 3, 6, 6);
+			var cr = new Cairo.Context (surface);
+			
+			cr.Fill ();
+			Gdk.CairoHelper.Rectangle (cr, update_rect);
 
-			// Paint to the pixmap, where we store our state
-			pixmap.DrawRectangle (widget.Style.BlackGC, true,
-					      update_rect.X, update_rect.Y,
-					      update_rect.Width, update_rect.Height);
-			widget.GdkWindow.InvalidateRect (update_rect, false);
+			((IDisposable)cr).Dispose ();
+			
+			widget.Window.InvalidateRect (update_rect, false);
 		}
 
 		private void ScribbleButtonPress (object o, ButtonPressEventArgs args)
 		{
 			// paranoia check, in case we haven't gotten a configure event
-			if (pixmap == null)
+			if (surface == null)
 				return;
 
 			EventButton ev = args.Event;

sample/GtkDemo/DemoEntryCompletion.cs

@@ -18,7 +18,7 @@ namespace GtkDemo
 
 			VBox vbox = new VBox (false, 5);
 			vbox.BorderWidth = 5;
-			this.VBox.PackStart (vbox, true, true, 0);
+			this.ContentArea.PackStart (vbox, true, true, 0);
 
 			Label label = new Label ("Completion demo, try writing <b>total</b> or <b>gnome</b> for example.");
 			label.UseMarkup = true;

sample/GtkDemo/DemoExpander.cs

@@ -17,7 +17,7 @@ namespace GtkDemo
 			Resizable = false;
 
 			VBox vbox = new VBox (false, 5);
-			this.VBox.PackStart (vbox, true, true, 0);
+			this.ContentArea.PackStart (vbox, true, true, 0);
 			vbox.BorderWidth = 5;
 
 			vbox.PackStart (new Label ("Expander demo. Click on the triangle for details."), false, false, 0);

sample/GtkDemo/DemoHyperText.cs

@@ -184,7 +184,7 @@ namespace GtkDemo
 			view.WindowToBufferCoords (TextWindowType.Widget, (int) args.Event.X, (int) args.Event.Y, out x, out y);
 			SetCursorIfAppropriate (view, x, y);
 
-			view.GdkWindow.GetPointer (out x, out y, out state);
+			view.Window.GetPointer (out x, out y, out state);
 		}
 
 		// Also update the cursor image if the window becomes visible

sample/GtkDemo/DemoImages.cs

@@ -170,7 +170,7 @@ namespace GtkDemo
 		{
 			Gdk.Pixbuf pixbuf = pixbufLoader.Pixbuf;
 			pixbuf.Fill (0xaaaaaaff);
-			progressiveImage.FromPixbuf = pixbuf;
+			progressiveImage.Pixbuf = pixbuf;
 		}
 
 		void ProgressiveUpdatedCallback (object obj, AreaUpdatedArgs args)

sample/GtkDemo/DemoMain.cs

@@ -180,8 +180,8 @@ namespace GtkDemo
 			scrolledWindow.Add (textView);
 
 			if (IsSource) {
-				FontDescription fontDescription = FontDescription.FromString ("Courier 12");
-				textView.ModifyFont (fontDescription);
+				FontDescription fontDescription = FontDescription.FromString ("monospace");
+				textView.OverrideFont (fontDescription);
 				textView.WrapMode = Gtk.WrapMode.None;
 			} else {
 				// Make it a bit nicer for text
@@ -191,7 +191,7 @@ namespace GtkDemo
 			}
 
 			return scrolledWindow;
-	        }
+		}
 
 		private TreeStore FillTree ()
 		{

sample/GtkDemo/DemoPixbuf.cs

@@ -71,23 +71,13 @@ namespace GtkDemo
 		}
 
 		// Expose callback for the drawing area
-		void Expose (object o, ExposeEventArgs args)
+		void DrawnCallback (object o, DrawnArgs args)
 		{
-			Widget widget = (Widget) o;
-			Gdk.Rectangle area = args.Event.Area;
-			byte[] pixels;
-			int rowstride;
+			Cairo.Context cr = args.Cr;
+			
+			Gdk.CairoHelper.SetSourcePixbuf (cr, frame, 0, 0);
+			cr.Paint ();
 
-			rowstride = frame.Rowstride;
-			pixels = new byte[(frame.Height - area.Y) * rowstride];
-			IntPtr src = (IntPtr)(frame.Pixels.ToInt64 () + rowstride * area.Y + area.X * 3);
-			Marshal.Copy (src, pixels, 0, pixels.Length);
-
-			widget.GdkWindow.DrawRgbImageDithalign (widget.Style.BlackGC,
-								area.X, area.Y, area.Width, area.Height,
-								Gdk.RgbDither.Normal,
-								pixels, rowstride,
-								area.X, area.Y);
 			args.RetVal = true;
 		}
 
@@ -152,7 +142,7 @@ namespace GtkDemo
 			frame = new Pixbuf (Colorspace.Rgb, false, 8, backWidth, backHeight);
 
 			drawingArea = new DrawingArea ();
-			drawingArea.ExposeEvent += new ExposeEventHandler (Expose);
+			drawingArea.Drawn += new DrawnHandler (DrawnCallback);
 
 			Add (drawingArea);
 			timeoutId = GLib.Timeout.Add (FrameDelay, new GLib.TimeoutHandler(timeout));

sample/GtkDemo/DemoSizeGroup.cs

@@ -33,7 +33,7 @@ namespace GtkDemo
 			Resizable = false;
 
  			VBox vbox = new VBox (false, 5);
- 			this.VBox.PackStart (vbox, true, true, 0);
+ 			this.ContentArea.PackStart (vbox, true, true, 0);
  			vbox.BorderWidth = 5;
 
  			sizeGroup = new SizeGroup (SizeGroupMode.Horizontal);
@@ -76,7 +76,7 @@ namespace GtkDemo
 		// Convenience function to create a combo box holding a number of strings
 		private ComboBox CreateComboBox (string [] strings)
 		{
-			ComboBox combo = ComboBox.NewText ();
+			ComboBoxText combo = new ComboBoxText ();
 
 			foreach (string str in strings)
 				combo.AppendText (str);

sample/GtkDemo/DemoTextView.cs

@@ -71,7 +71,7 @@ namespace GtkDemo
 			textView.AddChildAtAnchor (button, buttonAnchor);
 			button.ShowAll ();
 
-			ComboBox combo = ComboBox.NewText ();
+			ComboBoxText combo = new ComboBoxText ();
 			combo.AppendText ("Option 1");
 			combo.AppendText ("Option 2");
 			combo.AppendText ("Option 3");
@@ -154,20 +154,6 @@ namespace GtkDemo
 			tag.Background = "red";
 			buffer.TagTable.Add (tag);
 
-			// The C gtk-demo passes NULL for the drawable param, which isn't
-			// multi-head safe, so it seems bad to allow it in the C# API.
-			// But the Window isn't realized at this point, so we can't get
-			// an actual Drawable from it. So we kludge for now.
-			Pixmap stipple = Pixmap.CreateBitmapFromData (Gdk.Screen.Default.RootWindow, gray50_bits, gray50_width, gray50_height);
-
-			tag  = new TextTag ("background_stipple");
-			tag.BackgroundStipple = stipple;
-			buffer.TagTable.Add (tag);
-
-			tag  = new TextTag ("foreground_stipple");
-			tag.ForegroundStipple = stipple;
-			buffer.TagTable.Add (tag);
-
 			tag  = new TextTag ("big_gap_before_line");
 			tag.PixelsAboveLines = 30;
 			buffer.TagTable.Add (tag);
@@ -278,17 +264,10 @@ namespace GtkDemo
 		        buffer.Insert (ref insertIter, " or ");
 			buffer.InsertWithTagsByName (ref insertIter, "a red background", "red_background");
 		        buffer.Insert (ref insertIter, " or even ");
-			buffer.InsertWithTagsByName (ref insertIter, "a stippled red background",
-						     "red_background",
-						     "background_stipple");
-
-		        buffer.Insert (ref insertIter, " or ");
-                        buffer.InsertWithTagsByName (ref insertIter,
-						     "a stippled blue foreground on solid red background",
-						     "blue_foreground",
-						     "red_background",
-						     "foreground_stipple");
-		        buffer.Insert (ref insertIter, " (select that to read it) can be used.\n\n");
+			buffer.InsertWithTagsByName (ref insertIter, "a blue foreground on red background",
+                                            "blue_foreground",
+                                            "red_background");
+			buffer.Insert (ref insertIter, " (select that to read it) can be used.\n\n");
 
 			buffer.InsertWithTagsByName (ref insertIter, "Underline, strikethrough, and rise. ", "heading");
 
@@ -389,9 +368,9 @@ namespace GtkDemo
 
 			// Event box is to add a black border around each child view
 			EventBox eventBox = new EventBox ();
-			Gdk.Color color = new Gdk.Color ();
-			Gdk.Color.Parse ("black", ref color);
-			eventBox.ModifyBg (StateType.Normal, color);
+			Gdk.RGBA color = new Gdk.RGBA ();
+			color.Parse ("black");
+			eventBox.OverrideBackgroundColor (StateFlags.Normal, color);
 
 			Alignment align = new Alignment (0.5f, 0.5f, 1.0f, 1.0f);
 			align.BorderWidth = 1;

sample/Makefile.am

@@ -1,4 +1,4 @@
-# SUBDIRS = GtkDemo pixmaps valtest opaquetest gio gtk-gio
+SUBDIRS = GtkDemo #pixmaps valtest opaquetest gio gtk-gio
 
 if ENABLE_DOTNET
 DOTNET_TARGETS=drawing-sample.exe