C# GC.Dispose方法代码示例

        protected void OnDrawVolumeExposeEvent(object o, Gtk.ExposeEventArgs args)
        {
            Gdk.Color back = Style.Background(StateType.Normal);
            Gdk.Color fore = Style.Foreground(StateType.Normal);

            Drawable draw = args.Event.Window;

            int width;
            int height;
            draw.GetSize(out width, out height);

            Gdk.GC gc = new Gdk.GC(draw);

            gc.Foreground = back;
            gc.Background = back;
            draw.DrawRectangle(gc, true, 0, 0, width, height);

            //Color lightSlateGray = new Color(119,136,153);

            //gc.Colormap.AllocColor(ref lightSlateGray, false, true);

            int outside = height * 8 / 10;
            int middle = height * 6 / 10;
            int inside = height * 4 / 10;

            int startOut = 24;
            int startMiddle = 30;
            int startInside = 36;

            int endOut = width - 24;
            int endMiddle = width - 30;
            int endInside = width - 36;

            gc.Foreground = fore;
            gc.Foreground = fore;
            gc.SetLineAttributes(outside, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
            draw.DrawLine(gc, startOut, height / 2, endOut, height / 2);

            gc.Foreground = back;
            gc.Background = back;
            gc.SetLineAttributes(middle, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
            draw.DrawLine(gc, startMiddle, height / 2, endMiddle, height / 2);

            int endX = (endInside - startInside) * Percentage / 100 + startInside;
            gc.Foreground = fore;
            gc.Foreground = fore;
            gc.SetLineAttributes(inside, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
            draw.DrawLine(gc, startInside, height / 2, endX, height / 2);

            gc.Dispose();
        }

        public void Draw(Drawable draw, Gdk.Color back)
        {
            Gdk.GC gc = new Gdk.GC(draw);

            try {

                int width;
                int height;
                draw.GetSize(out width, out height);

                int xPoint = (width * Volume) / 100;
                int yTop = height * Volume / 100;

                List<Point> points = new List<Point>();
                points.Add(new Point(0,0));
                points.Add(new Point(xPoint, yTop));
                points.Add(new Point(xPoint, height));
                points.Add(new Point(0,height));
                points.Add(new Point(0,0));

                gc.Foreground = back;
                gc.Background = back;
                draw.DrawPolygon(gc, true, points.ToArray());
                draw.DrawRectangle(gc, true, xPoint, 0, width, height);

                points.Clear();
                points.Add(new Point(0,0));
                points.Add(new Point(xPoint, yTop));
                points.Add(new Point(xPoint, 0));
                points.Add(new Point(0,0));
                gc.Foreground = new Gdk.Color(0,128,0);
                gc.Background = new Gdk.Color(0,128,0);
                draw.DrawPolygon(gc, true, points.ToArray());

            } catch (Exception ex) {
                Console.WriteLine(ex.Source);
                Console.WriteLine(ex.StackTrace);
            }

            gc.Dispose();
        }

		protected override void Render (Drawable window, Widget widget, Gdk.Rectangle background_area, Gdk.Rectangle cell_area, Gdk.Rectangle expose_area, CellRendererState flags)
		{
			if (isDisposed)
				return;
			if (diffMode) {
				
				if (path.Equals (selctedPath)) {
					selectedLine = -1;
					selctedPath = null;
				}
				
				int w, maxy;
				window.GetSize (out w, out maxy);
				if (DrawLeft) {
					cell_area.Width += cell_area.X - leftSpace;
					cell_area.X = leftSpace;
				}
				var treeview = widget as FileTreeView;
				var p = treeview != null? treeview.CursorLocation : null;
				
				cell_area.Width -= RightPadding;
				
				window.DrawRectangle (widget.Style.BaseGC (Gtk.StateType.Normal), true, cell_area.X, cell_area.Y, cell_area.Width - 1, cell_area.Height);
				
				Gdk.GC normalGC = widget.Style.TextGC (StateType.Normal);
				Gdk.GC removedGC = new Gdk.GC (window);
				removedGC.Copy (normalGC);
				removedGC.RgbFgColor = baseRemoveColor.AddLight (-0.3);
				Gdk.GC addedGC = new Gdk.GC (window);
				addedGC.Copy (normalGC);
				addedGC.RgbFgColor = baseAddColor.AddLight (-0.3);
				Gdk.GC infoGC = new Gdk.GC (window);
				infoGC.Copy (normalGC);
				infoGC.RgbFgColor = widget.Style.Text (StateType.Normal).AddLight (0.2);
				
				Cairo.Context ctx = CairoHelper.Create (window);
				Gdk.Color bgColor = new Gdk.Color (0,0,0);
				
				
				// Rendering is done in two steps:
				// 1) Get a list of blocks to render
				// 2) render the blocks
				
				int y = cell_area.Y + 2;
				
				// cline keeps track of the current source code line (the one to jump to when double clicking)
				int cline = 1;
				bool inHeader = true;
				BlockInfo currentBlock = null;
				
				List<BlockInfo> blocks = new List<BlockInfo> ();
				
				for (int n=0; n<lines.Length; n++, y += lineHeight) {
					
					string line = lines [n];
					if (line.Length == 0) {
						currentBlock = null;
						y -= lineHeight;
						continue;
					}
					
					char tag = line [0];
	
					if (line.StartsWith ("---") || line.StartsWith ("+++")) {
						// Ignore this part of the header.
						currentBlock = null;
						y -= lineHeight;
						continue;
					}
					if (tag == '@') {
						int l = ParseCurrentLine (line);
						if (l != -1) cline = l - 1;
						inHeader = false;
					} else if (tag != '-' && !inHeader)
						cline++;
					
					BlockType type;
					bool hasBg = false;
					switch (tag) {
						case '-': type = BlockType.Removed; break;
						case '+': type = BlockType.Added; break;
						case '@': type = BlockType.Info; break;
						default: type = BlockType.Unchanged; break;
					}

					if (currentBlock == null || type != currentBlock.Type) {
						if (y > maxy)
							break;
					
						// Starting a new block. Mark section ends between a change block and a normal code block
						if (currentBlock != null && IsChangeBlock (currentBlock.Type) && !IsChangeBlock (type))
							currentBlock.SectionEnd = true;
						
						currentBlock = new BlockInfo () {
							YStart = y,
							FirstLine = n,
							Type = type,
							SourceLineStart = cline,
							SectionStart = (blocks.Count == 0 || !IsChangeBlock (blocks[blocks.Count - 1].Type)) && IsChangeBlock (type)
						};
//.........这里部分代码省略.........

		protected override bool OnExposeEvent (Gdk.EventExpose args)
		{
			Gdk.Window window = args.Window;
			var alloc = Allocation;
			int width = alloc.Width;
			int height = alloc.Height;
			
			int lineWidth = width - margin * 2;
			int xpos = margin + padding;
			int yPos = margin;
			
			if (PreviewCompletionString) {
				layout.SetText (
					string.IsNullOrEmpty (CompletionString) ? MonoDevelop.Core.GettextCatalog.GetString ("Select template") : CompletionString
				);
				int wi, he;
				layout.GetPixelSize (out wi, out he);
				window.DrawRectangle (this.Style.BaseGC (StateType.Insensitive), true, margin, yPos, lineWidth, he + padding);
				window.DrawLayout (
					string.IsNullOrEmpty (CompletionString) ? this.Style.TextGC (StateType.Insensitive) : this.Style.TextGC (StateType.Normal),
					xpos,
					yPos,
					layout
				);
				yPos += rowHeight;
			}
			
			//when there are no matches, display a message to indicate that the completion list is still handling input
			if (filteredItems.Count == 0) {
				Gdk.GC gc = new Gdk.GC (window);
				gc.RgbFgColor = new Gdk.Color (0xff, 0xbc, 0xc1);
				window.DrawRectangle (gc, true, 0, yPos, width, height - yPos);
				layout.SetText (win.DataProvider.ItemCount == 0 ? NoSuggestionsMsg : NoMatchesMsg);
				int lWidth, lHeight;
				layout.GetPixelSize (out lWidth, out lHeight);
				gc.RgbFgColor = new Gdk.Color (0, 0, 0);
				window.DrawLayout (gc, (width - lWidth) / 2, yPos + (height - lHeight - yPos) / 2, layout);
				gc.Dispose ();
				return true;
			}
			
			var textGCInsensitive = this.Style.TextGC (StateType.Insensitive);
			var textGCNormal = this.Style.TextGC (StateType.Normal);
			var fgGCNormal = this.Style.ForegroundGC (StateType.Normal);
			var matcher = CompletionMatcher.CreateCompletionMatcher (CompletionString);
			var highlightColor = HighlightColor;
			Iterate (true, ref yPos, delegate (Category category, int ypos) {
				if (ypos >= height - margin)
					return;
				
				//	window.DrawRectangle (this.Style.BackgroundGC (StateType.Insensitive), true, 0, yPos, width, rowHeight);
				int x = 2;
				if (!string.IsNullOrEmpty (category.CompletionCategory.Icon)) {
					var icon = ImageService.GetPixbuf (category.CompletionCategory.Icon, IconSize.Menu);
					window.DrawPixbuf (fgGCNormal, icon, 0, 0, margin, ypos, icon.Width, icon.Height, Gdk.RgbDither.None, 0, 0);
					x = icon.Width + 4;
				}
				
				layout.SetMarkup ("<span weight='bold'>" + category.CompletionCategory.DisplayText + "</span>");
				window.DrawLayout (textGCInsensitive, x, ypos, layout);
				layout.SetMarkup ("");
			}, delegate (Category curCategory, int item, int itemidx, int ypos) {
				if (ypos >= height - margin)
					return false;
				if (InCategoryMode && curCategory != null && curCategory.CompletionCategory != null) {
					xpos = margin + padding + 8;
				} else {
					xpos = margin + padding;
				}
				string markup      = win.DataProvider.HasMarkup (item) ? (win.DataProvider.GetMarkup (item) ?? "&lt;null&gt;") : GLib.Markup.EscapeText (win.DataProvider.GetText (item) ?? "<null>");
				string description = win.DataProvider.GetDescription (item);
				
				if (string.IsNullOrEmpty (description)) {
					layout.SetMarkup (markup);
				} else {
					if (item == SelectedItem) {
						layout.SetMarkup (markup + " " + description );
					} else {
						layout.SetMarkup (markup + " <span foreground=\"darkgray\">" + description + "</span>");
					}
				}
				int mw, mh;
				layout.GetPixelSize (out mw, out mh);
				if (mw > listWidth) {
					WidthRequest = listWidth = mw;
					win.WidthRequest = win.Allocation.Width + mw - width;
					win.QueueResize ();
				}
			
				string text = win.DataProvider.GetText (item);
				
				if ((!SelectionEnabled || item != SelectedItem) && !string.IsNullOrEmpty (text)) {
					int[] matchIndices = matcher.GetMatch (text);
					if (matchIndices != null) {
						Pango.AttrList attrList = layout.Attributes ?? new Pango.AttrList ();
						for (int newSelection = 0; newSelection < matchIndices.Length; newSelection++) {
							int idx = matchIndices[newSelection];
							Pango.AttrForeground fg = new Pango.AttrForeground (highlightColor.Red, highlightColor.Green, highlightColor.Blue);
							fg.StartIndex = (uint)idx;
							fg.EndIndex = (uint)(idx + 1);
//.........这里部分代码省略.........

		protected override void Render (Drawable window, Widget widget, Gdk.Rectangle background_area, Gdk.Rectangle cell_area, Gdk.Rectangle expose_area, CellRendererState flags)
		{
			if (isDisposed)
				return;
			if (diffMode) {
				
				if (path.Equals (selctedPath)) {
					selectedLine = -1;
					selctedPath = null;
				}
				
				int w, maxy;
				window.GetSize (out w, out maxy);
				
				var treeview = widget as FileTreeView;
				var p = treeview != null? treeview.CursorLocation : null;
				
				int recty = cell_area.Y;
				int recth = cell_area.Height - 1;
				if (recty < 0) {
					recth += recty + 1;
					recty = -1;
				}
				if (recth > maxy + 2)
					recth = maxy + 2;
				
				window.DrawRectangle (widget.Style.BaseGC (Gtk.StateType.Normal), true, cell_area.X, recty, cell_area.Width - 1, recth);

				Gdk.GC normalGC = widget.Style.TextGC (StateType.Normal);
				Gdk.GC removedGC = new Gdk.GC (window);
				removedGC.Copy (normalGC);
				removedGC.RgbFgColor = new Color (255, 0, 0);
				Gdk.GC addedGC = new Gdk.GC (window);
				addedGC.Copy (normalGC);
				addedGC.RgbFgColor = new Color (0, 0, 255);
				Gdk.GC infoGC = new Gdk.GC (window);
				infoGC.Copy (normalGC);
				infoGC.RgbFgColor = new Color (0xa5, 0x2a, 0x2a);
				
				int y = cell_area.Y + 2;
				int cline = 1;
				bool inHeader = true;
				
				for (int n=0; n<lines.Length; n++, y += lineHeight) {
					
					string line = lines [n];
					if (line.Length == 0)
						continue;
					
					char tag = line [0];

					// Keep track of the real file line
					int thisLine = cline;
					if (tag == '@') {
						int l = ParseCurrentLine (line);
						if (l != -1) cline = thisLine = l;
						inHeader = false;
					} else if (tag != '-' && !inHeader)
						cline++;
					
					if (y + lineHeight < 0)
						continue;
					if (y > maxy)
						break;
					
					Gdk.GC gc;
					switch (tag) {
						case '-': gc = removedGC; break;
						case '+': gc = addedGC; break;
						case '@': gc = infoGC; break;
						default: gc = normalGC; break;
					}

					if (p.HasValue && p.Value.X >= cell_area.X && p.Value.X <= cell_area.Right && p.Value.Y >= y && p.Value.Y < y + lineHeight) {
						window.DrawRectangle (widget.Style.BaseGC (Gtk.StateType.Prelight), true, cell_area.X, y, cell_area.Width - 1, lineHeight);
						selectedLine = thisLine;
						selctedPath = path;
					}
					
					layout.SetText (line);
					window.DrawLayout (gc, cell_area.X + 2, y, layout);
				}
				window.DrawRectangle (widget.Style.DarkGC (Gtk.StateType.Prelight), false, cell_area.X, recty, cell_area.Width - 1, recth);
				removedGC.Dispose ();
				addedGC.Dispose ();
				infoGC.Dispose ();
			} else {
				int y = cell_area.Y + (cell_area.Height - height)/2;
				window.DrawLayout (widget.Style.TextGC (GetState(flags)), cell_area.X, y, layout);
			}
		}

			protected override void Render (Drawable window, Widget widget, Gdk.Rectangle background_area, Gdk.Rectangle cell_area, Gdk.Rectangle expose_area, CellRendererState flags)
			{
				if (isDisposed)
					return;
				try {
					if (diffMode) {
						int w, maxy;
						window.GetSize (out w, out maxy);

						int recty = cell_area.Y;
						int recth = cell_area.Height - 1;
						if (recty < 0) {
							recth += recty + 1;
							recty = -1;
						}
						if (recth > maxy + 2)
							recth = maxy + 2;

						window.DrawRectangle (widget.Style.BaseGC (Gtk.StateType.Normal), true, cell_area.X, recty, cell_area.Width - 1, recth);

						Gdk.GC normalGC = widget.Style.TextGC (StateType.Normal);
						Gdk.GC removedGC = new Gdk.GC (window);
						removedGC.Copy (normalGC);
						removedGC.RgbFgColor = new Color (255, 0, 0);
						Gdk.GC addedGC = new Gdk.GC (window);
						addedGC.Copy (normalGC);
						addedGC.RgbFgColor = new Color (0, 0, 255);
						Gdk.GC infoGC = new Gdk.GC (window);
						infoGC.Copy (normalGC);
						infoGC.RgbFgColor = new Color (0xa5, 0x2a, 0x2a);

						int y = cell_area.Y + 2;

						for (int n = 0; n < lines.Length; n++,y += lineHeight) {
							if (y + lineHeight < 0)
								continue;
							if (y > maxy)
								break;
							string line = lines[n];
							if (line.Length == 0)
								continue;

							Gdk.GC gc;
							switch (line[0]) {
							case '-':
								gc = removedGC;
								break;
							case '+':
								gc = addedGC;
								break;
							case '@':
								gc = infoGC;
								break;
							default:
								gc = normalGC;
								break;
							}

							layout.SetText (line);
							window.DrawLayout (gc, cell_area.X + 2, y, layout);
						}
						window.DrawRectangle (widget.Style.DarkGC (Gtk.StateType.Prelight), false, cell_area.X, recty, cell_area.Width - 1, recth);
						removedGC.Dispose ();
						addedGC.Dispose ();
						infoGC.Dispose ();
					} else {
						int y = cell_area.Y + (cell_area.Height - height) / 2;
						window.DrawLayout (widget.Style.TextGC (GetState (flags)), cell_area.X, y, layout);
					}
				} catch (Exception e) {
					Console.WriteLine (e);
				}
			}

		protected override bool OnExposeEvent (Gdk.EventExpose args)
		{
			using (var context = Gdk.CairoHelper.Create (args.Window)) {
				context.LineWidth = 1;
				Gdk.Window window = args.Window;
				var alloc = Allocation;
				int width = alloc.Width;
				int height = alloc.Height;
				context.Rectangle (args.Area.X, args.Area.Y, args.Area.Width, args.Area.Height);
				context.Color = this.backgroundColor;
				context.Fill ();

				int xpos = iconTextSpacing;
				int yPos = (int)-vadj.Value;
				
				//when there are no matches, display a message to indicate that the completion list is still handling input
				if (filteredItems.Count == 0) {
					Gdk.GC gc = new Gdk.GC (window);
					gc.RgbFgColor = backgroundColor.ToGdkColor ();
					window.DrawRectangle (gc, true, 0, yPos, width, height - yPos);
					noMatchLayout.SetText (win.DataProvider.ItemCount == 0 ? NoSuggestionsMsg : NoMatchesMsg);
					int lWidth, lHeight;
					noMatchLayout.GetPixelSize (out lWidth, out lHeight);
					gc.RgbFgColor = (Mono.TextEditor.HslColor)textColor;
					window.DrawLayout (gc, (width - lWidth) / 2, yPos + (height - lHeight - yPos) / 2 - lHeight, noMatchLayout);
					gc.Dispose ();

					return false;
				}


				var textGCNormal = new Gdk.GC (window);
				textGCNormal.RgbFgColor = (Mono.TextEditor.HslColor)textColor;
				var fgGCNormal = this.Style.ForegroundGC (StateType.Normal);
				var matcher = CompletionMatcher.CreateCompletionMatcher (CompletionString);
				Iterate (true, ref yPos, delegate (Category category, int ypos) {
					if (ypos >= height)
						return;
					if (ypos < -rowHeight)
						return;

					//	window.DrawRectangle (this.Style.BackgroundGC (StateType.Insensitive), true, 0, yPos, width, rowHeight);
					int x = 2;
					if (category.CompletionCategory != null && !string.IsNullOrEmpty (category.CompletionCategory.Icon)) {
						var icon = ImageService.GetPixbuf (category.CompletionCategory.Icon, IconSize.Menu);
						window.DrawPixbuf (fgGCNormal, icon, 0, 0, 0, ypos, icon.Width, icon.Height, Gdk.RgbDither.None, 0, 0);
						x = icon.Width + 4;
					}
					context.Rectangle (0, ypos, Allocation.Width, rowHeight);
					context.Color = backgroundColor;
					context.Fill ();


//					layout.SetMarkup ("<span weight='bold' foreground='#AAAAAA'>" + (category.CompletionCategory != null ? category.CompletionCategory.DisplayText : "Uncategorized") + "</span>");
//					window.DrawLayout (textGCInsensitive, x - 1, ypos + 1 + (rowHeight - py) / 2, layout);
//					layout.SetMarkup ("<span weight='bold'>" + (category.CompletionCategory != null ? category.CompletionCategory.DisplayText : "Uncategorized") + "</span>");
					categoryLayout.SetMarkup ((category.CompletionCategory != null ? category.CompletionCategory.DisplayText : "Uncategorized"));
					int px, py;
					categoryLayout.GetPixelSize (out px, out py);
					window.DrawLayout (textGCNormal, x, ypos + (rowHeight - py) / 2, categoryLayout);
				}, delegate (Category curCategory, int item, int itemidx, int ypos) {
					if (ypos >= height)
						return false;
					if (ypos < -rowHeight)
						return true;
					const int categoryModeItemIndenting = 0;
					if (InCategoryMode && curCategory != null && curCategory.CompletionCategory != null) {
						xpos = iconTextSpacing + categoryModeItemIndenting;
					} else {
						xpos = iconTextSpacing;
					}
					string markup = win.DataProvider.HasMarkup (item) ? (win.DataProvider.GetMarkup (item) ?? "&lt;null&gt;") : GLib.Markup.EscapeText (win.DataProvider.GetText (item) ?? "<null>");
					string description = win.DataProvider.GetDescription (item);
					
					if (string.IsNullOrEmpty (description)) {
						layout.SetMarkup (markup);
					} else {
						if (item == SelectedItem) {
							layout.SetMarkup (markup + " " + description);
						} else {
							layout.SetMarkup (markup + " <span foreground=\"darkgray\">" + description + "</span>");
						}
					}
				
					string text = win.DataProvider.GetText (item);
					
					if (!string.IsNullOrEmpty (text)) {
						int[] matchIndices = matcher.GetMatch (text);
						if (matchIndices != null) {
							Pango.AttrList attrList = layout.Attributes ?? new Pango.AttrList ();
							for (int newSelection = 0; newSelection < matchIndices.Length; newSelection++) {
								int idx = matchIndices [newSelection];
								var fg = new AttrForeground ((ushort)(highlightColor.R * ushort.MaxValue), (ushort)(highlightColor.G * ushort.MaxValue), (ushort)(highlightColor.B  * ushort.MaxValue));
								fg.StartIndex = (uint)idx;
								fg.EndIndex = (uint)(idx + 1);
								attrList.Insert (fg);
							}
							layout.Attributes = attrList;
						}
					}
//.........这里部分代码省略.........

	protected void OnTableTabsExposeEvent (object o, ExposeEventArgs args) {
		
		Color fore = Style.Foreground(StateType.Normal);

		Drawable draw = args.Event.Window;
		Gdk.GC gc = new Gdk.GC(draw);

		try {
			Rectangle tabRect;
			switch (notebook.CurrentPage) {
				case 0: // WiFi
					tabRect = imageTabWiFi.Allocation;
					break;
				case 1: // Clock
					tabRect = imageTabClock.Allocation;
					break;
				case 2: // Radio
					tabRect = imageTabRadio.Allocation;
					break;
				case 3: // weather
					tabRect = imageTabWeather.Allocation;
					break;
				default:
					tabRect = imageTabIntercom.Allocation;
					break;
			}

			Rectangle rect = notebook.Allocation;
			rect.Inflate(4, 4);
			tabRect.Inflate(4, 4);

			List<Gdk.Point> points = new List<Gdk.Point>();
			points.Add(new Point(rect.Left, rect.Top));
			points.Add(new Point(rect.Right, rect.Top));
			points.Add(new Point(rect.Right, tabRect.Top));
			points.Add(new Point(tabRect.Right, tabRect.Top));
			points.Add(new Point(tabRect.Right, tabRect.Bottom));
			points.Add(new Point(rect.Right, tabRect.Bottom));
			points.Add(new Point(rect.Right, rect.Bottom));
			points.Add(new Point(rect.Left, rect.Bottom));
			points.Add(new Point(rect.Left, rect.Top));

			gc.Foreground = fore;
			gc.Background = fore;
			gc.SetLineAttributes(4, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
			draw.DrawLines(gc, points.ToArray());

		} catch (Exception ex) {
			Console.WriteLine(ex.Source);
			Console.WriteLine(ex.StackTrace);
		}

		gc.Dispose();
	}

	protected void OnCtlDrawingMetaExposeEvent (object o, ExposeEventArgs args) {

		Gdk.Color back = ctlDrawingMeta.Style.Background(StateType.Normal);
		Gdk.Color fore = ctlDrawingMeta.Style.Foreground(StateType.Normal);

		Drawable draw = ctlDrawingMeta.GdkWindow;
		Gdk.GC gc = new Gdk.GC(draw);
		try {
			gc.Foreground = back;
			gc.Background = back;

			int width;
			int height;
			draw.GetSize(out width, out height);
			draw.DrawRectangle(gc, true, 0, 0, width, height);

			gc.Foreground = fore;

			String stationName = "No station";
			if (station != null) {
				stationName = station.CallLetters + "\n" + station.Location; 
			}
			String text = stationName + "\n" +
			              artist + "\n" +
			              song;

			Pango.FontDescription font = Pango.FontDescription.FromString("Serif 14");
			Pango.Layout layout = ctlDrawingMeta.CreatePangoLayout(text);
			layout.FontDescription = font;
			layout.Width = Pango.Units.FromPixels(width);
			draw.DrawLayoutWithColors(gc, 0, 0, layout, fore, back);
			layout.Dispose();
		} catch (Exception ex) {
			Console.WriteLine(ex.Source);
			Console.WriteLine(ex.StackTrace);
		}

		gc.Dispose();
	}

	protected void OnDrawWiFiExposeEvent (object o, ExposeEventArgs args) {

		Gdk.Color back = drawWiFi.Style.Background(StateType.Normal);
		Gdk.Color fore = drawWiFi.Style.Foreground(StateType.Normal);

		Drawable draw = drawWiFi.GdkWindow;
		Gdk.GC gc = new Gdk.GC(draw);

		try {
			gc.Foreground = back;
			gc.Background = back;

			int width;
			int height;
			draw.GetSize(out width, out height);
			draw.DrawRectangle(gc, true, 0, 0, width, height);

			gc.Foreground = fore;

			lastNoise = recognizer.Noise;
			lastRecognized = recognizer.TimeRecognized.ToShortTimeString() + ": " + recognizer.KeywordRecognized;
			lastBuffer = recognizer.BufferSize;
			lastStatus = status;

			String text = "IP: " + ipAddress + "\n" +
			              "Status: " + lastStatus + "\n" +
				          "Recognized: " + lastRecognized + "\n" +
            			  "Buffer: " + lastBuffer + "\n" +
            			  "Noise: " + lastNoise + "\n" +
			              "Active Alarm: " + activeAlarm + "\n" +
			              "Next Alarm: " + nextAlarm + "\n";

			if (activeConnection == null) {
				text += "WiFi: Not connected\n";
			} else {
				text += "WiFi: " + activeConnection.ESSID + "\n";
				text += "BSSID: " + activeConnection.BSSID + "\n";
				text += "Channel: " + activeConnection.Channel + "\n";
				text += "Signal: " + activeConnection.Signal + "\n";
				text += "Encryption: " + activeConnection.Encryption + "\n";
			}
			
			Pango.FontDescription font = Pango.FontDescription.FromString("Serif 10");
			Pango.Layout layout = drawWiFi.CreatePangoLayout(text);
			layout.FontDescription = font;
			layout.Width = Pango.Units.FromPixels(width);
			draw.DrawLayoutWithColors(gc, 0, 0, layout, fore, back);
			layout.Dispose();

		} catch (Exception ex) {
			Console.WriteLine(ex.Source);
			Console.WriteLine(ex.StackTrace);
		}

		gc.Dispose();
	}

        protected void OnDrawClockExposeEvent(object o, Gtk.ExposeEventArgs args)
        {
            Gdk.Color back = Style.Background(StateType.Normal);
            Gdk.Color fore = Style.Foreground(StateType.Normal);

            Drawable draw = args.Event.Window;

            int width;
            int height;
            draw.GetSize(out width, out height);

            Gdk.GC gc = new Gdk.GC(draw);
            gc.Foreground = back;
            gc.Background = back;

            Point start;
            Point stop;
            double xMax;
            double yMax;
            double angle = 0;

            int size = width < height ? width : height;
            size -= Spacing;
            Point center = new Point(width / 2, height / 2);
            Rectangle rect = new Rectangle((width - size) / 2, (height - size) / 2, size, size);

            if (clockFace != null && (clockFace.Width != width || clockFace.Height != height)) {
                clockFace.Dispose();
                clockFace = null;
            }

            if (clockFace == null) {

                draw.DrawPixbuf(gc, clockFace, 0, 0, 0, 0, width, height, RgbDither.None, 0, 0);

                draw.DrawRectangle(gc, true, 0, 0, width, height);

                gc.Foreground = fore;

                gc.SetLineAttributes(4, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
                draw.DrawArc(gc, false, rect.Left, rect.Top, size, size, 0, 360 * 64);
                gc.SetLineAttributes(1, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);

                for (int index = 0; index < 60; index++, angle += Math.PI / 30.0) {
                    xMax = Math.Cos(angle) * size / 2;
                    yMax = Math.Sin(angle) * size / 2;
                    start = center;
                    stop = center;
                    if ((index % 5) == 0) {
                        int hour = ((index / 5) + 3) % 12;
                        if (hour == 0) hour = 12;

                        start.Offset((int)(xMax / 1.30), (int)(yMax / 1.30));

                        Pango.FontDescription font = Pango.FontDescription.FromString("Serif 10");
                        Pango.Layout layout = CreatePangoLayout(hour.ToString());
                        layout.FontDescription = font;
                        layout.Width = Pango.Units.FromPixels(100);

                        int textWidth;
                        int textHeight;
                        layout.GetPixelSize(out textWidth, out textHeight);

                        start.Offset(-textWidth / 2, -textHeight / 2);

                        draw.DrawLayoutWithColors(gc, start.X, start.Y, layout, fore, back);
                        layout.Dispose();

                        start = center;
                        gc.SetLineAttributes(4, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
                        start.Offset((int)(xMax / 1.05), (int)(yMax / 1.05));
                        stop.Offset((int)xMax, (int)yMax);
                        draw.DrawLine(gc, start.X, start.Y, stop.X, stop.Y);
                        gc.SetLineAttributes(1, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
                    } else {
                        start.Offset((int)(xMax / 1.05), (int)(yMax / 1.05));
                        stop.Offset((int)xMax, (int)yMax);
                        draw.DrawLine(gc, start.X, start.Y, stop.X, stop.Y);
                    }
                }
                clockFace = Pixbuf.FromDrawable(draw, draw.Colormap, 0, 0, 0, 0, width, height);

            } else {

                draw.DrawPixbuf(gc, clockFace, 0, 0, 0, 0, width, height, RgbDither.None, 0, 0);

            }

            gc.Foreground = fore;

            double startAngle = 1.5 * Math.PI;
            double secondAngle;
            double minuteAngle;
            double hourAngle;

            if (AnalogMovement) {

                double value = (CurrentTime.Second * 1000) + CurrentTime.Millisecond;
                double divisor = 60000.0;
                secondAngle = 2.0 * Math.PI * value / divisor + startAngle;
//.........这里部分代码省略.........

        protected void OnDrawWeatherExposeEvent(object o, ExposeEventArgs args)
        {
            Gdk.Color back = Style.Background(StateType.Normal);
            Gdk.Color fore = Style.Foreground(StateType.Normal);

            Drawable draw = drawWeather.GdkWindow;
            Gdk.GC gc = new Gdk.GC(draw);

            try {
                gc.Foreground = back;
                gc.Background = back;

                int width;
                int height;
                draw.GetSize(out width, out height);
                draw.DrawRectangle(gc, true, 0, 0, width, height);

                gc.Foreground = fore;

                String text = "";
                if (Weather.Forecasts.Count > SelectedForecast) {
                    WeatherService.WeatherPeriod info = Weather.Forecasts[SelectedForecast];
                    text = info.Title + " - " + info.Forecast + "\n";
                }

                Pango.FontDescription font = Pango.FontDescription.FromString("Serif 14");
                Pango.Layout layout = drawWeather.CreatePangoLayout(text);
                layout.FontDescription = font;
                layout.Width = Pango.Units.FromPixels(width);
                draw.DrawLayoutWithColors(gc, 0, 0, layout, fore, back);
                layout.Dispose();

            } catch (Exception ex) {
                Console.WriteLine(ex.Source);
                Console.WriteLine(ex.StackTrace);
            }

            gc.Dispose();
        }

        protected void OnTableWeatherExposeEvent(object o, ExposeEventArgs args)
        {
            Color fore = Style.Foreground(StateType.Normal);

            Drawable draw = args.Event.Window;
            Gdk.GC gc = new Gdk.GC(draw);

            Rectangle rect;
            switch (SelectedForecast) {
                case 0:
                    rect = imageMorning1.Allocation;
                    break;
                case 1:
                    rect = imageDay1.Allocation;
                    break;
                case 2:
                    rect = imageMorning2.Allocation;
                    break;
                case 3:
                    rect = imageDay2.Allocation;
                    break;
                case 4:
                    rect = imageMorning3.Allocation;
                    break;
                case 5:
                    rect = imageDay3.Allocation;
                    break;
                case 6:
                    rect = imageMorning4.Allocation;
                    break;
                default:
                    rect = imageDay4.Allocation;
                    break;
            }

            gc.Foreground = fore;
            gc.Background = fore;
            gc.SetLineAttributes(4, LineStyle.Solid, CapStyle.Round, JoinStyle.Round);
            draw.DrawRectangle(gc, false, rect);

            gc.Dispose();
        }

        protected override bool OnExposeEvent(Gdk.EventExpose ev)
        {
            base.OnExposeEvent(ev);
            // Insert drawing code here.

            var window = ev.Window;
            var gc = new Gdk.GC(window);

            // window.DrawRectangle(gc, true, new Rectangle(0, 0, 100, 100));
            int width = this.DrawingWidth;
            int height = this.DrawingHeight;
            CheckerPattern.Draw(window, gc, 10, width, height);

            DrawImage(window, gc);
            DrawIslands(window, gc);

            m_linkIslandsHelper.Step4_Draw(window, gc);

            gc.Dispose();

            return true;
        }