C# Pango.GetLine方法代码示例

		void DrawTab (Context ctx, DockNotebookTab tab, Gdk.Rectangle allocation, Gdk.Rectangle tabBounds, bool highlight, bool active, bool dragging, Pango.Layout la)
		{
			// This logic is stupid to have here, should be in the caller!
			if (dragging) {
				tabBounds.X = (int)(tabBounds.X + (dragX - tabBounds.X) * dragXProgress);
				tabBounds.X = Clamp (tabBounds.X, tabStartX, tabEndX - tabBounds.Width);
			}
			int padding = LeftRightPadding;
			padding = (int)(padding * Math.Min (1.0, Math.Max (0.5, (tabBounds.Width - 30) / 70.0)));

			ctx.LineWidth = 1;
			LayoutTabBorder (ctx, allocation, tabBounds.Width, tabBounds.X, 0, active);
			ctx.ClosePath ();
			using (var gr = new LinearGradient (tabBounds.X, TopBarPadding, tabBounds.X, allocation.Bottom)) {
				if (active) {
					gr.AddColorStop (0, Styles.BreadcrumbGradientStartColor.MultiplyAlpha (tab.Opacity));
					gr.AddColorStop (1, Styles.BreadcrumbBackgroundColor.MultiplyAlpha (tab.Opacity));
				} else {
					gr.AddColorStop (0, CairoExtensions.ParseColor ("f4f4f4").MultiplyAlpha (tab.Opacity));
					gr.AddColorStop (1, CairoExtensions.ParseColor ("cecece").MultiplyAlpha (tab.Opacity));
				}
				ctx.SetSource (gr);
			}
			ctx.Fill ();

			ctx.SetSourceColor (new Cairo.Color (1, 1, 1, .5).MultiplyAlpha (tab.Opacity));
			LayoutTabBorder (ctx, allocation, tabBounds.Width, tabBounds.X, 1, active);
			ctx.Stroke ();

			ctx.SetSourceColor (Styles.BreadcrumbBorderColor.MultiplyAlpha (tab.Opacity));
			LayoutTabBorder (ctx, allocation, tabBounds.Width, tabBounds.X, 0, active);
			ctx.StrokePreserve ();

			if (tab.GlowStrength > 0) {
				Gdk.Point mouse = tracker.MousePosition;
				using (var rg = new RadialGradient (mouse.X, tabBounds.Bottom, 0, mouse.X, tabBounds.Bottom, 100)) {
					rg.AddColorStop (0, new Cairo.Color (1, 1, 1, 0.4 * tab.Opacity * tab.GlowStrength));
					rg.AddColorStop (1, new Cairo.Color (1, 1, 1, 0));

					ctx.SetSource (rg);
					ctx.Fill ();
				}
			} else {
				ctx.NewPath ();
			}

			// Render Close Button (do this first so we can tell how much text to render)

			var ch = allocation.Height - TopBarPadding - BottomBarPadding + CloseImageTopOffset;
			var crect = new Gdk.Rectangle (tabBounds.Right - padding - CloseButtonSize + 3,
				            tabBounds.Y + TopBarPadding + (ch - CloseButtonSize) / 2,
				            CloseButtonSize, CloseButtonSize);
			tab.CloseButtonAllocation = crect;
			tab.CloseButtonAllocation.Inflate (2, 2);

			bool closeButtonHovered = tracker.Hovered && tab.CloseButtonAllocation.Contains (tracker.MousePosition) && tab.WidthModifier >= 1.0f;
			bool drawCloseButton = tabBounds.Width > 60 || highlight || closeButtonHovered;
			if (drawCloseButton) {
				DrawCloseButton (ctx, new Gdk.Point (crect.X + crect.Width / 2, crect.Y + crect.Height / 2), closeButtonHovered, tab.Opacity, tab.DirtyStrength);
			}

			// Render Text
			int w = tabBounds.Width - (padding * 2 + CloseButtonSize);
			if (!drawCloseButton)
				w += CloseButtonSize;

			int textStart = tabBounds.X + padding;

			ctx.MoveTo (textStart, tabBounds.Y + TopPadding + TextOffset + VerticalTextSize);
			if (!MonoDevelop.Core.Platform.IsMac && !MonoDevelop.Core.Platform.IsWindows) {
				// This is a work around for a linux specific problem.
				// A bug in the proprietary ATI driver caused TAB text not to draw.
				// If that bug get's fixed remove this HACK asap.
				la.Ellipsize = Pango.EllipsizeMode.End;
				la.Width = (int)(w * Pango.Scale.PangoScale);
				ctx.SetSourceColor (tab.Notify ? new Cairo.Color (0, 0, 1) : Styles.TabBarActiveTextColor);
				Pango.CairoHelper.ShowLayoutLine (ctx, la.GetLine (0));
			} else {
				// ellipses are for space wasting ..., we cant afford that
				using (var lg = new LinearGradient (textStart + w - 5, 0, textStart + w + 3, 0)) {
					var color = tab.Notify ? new Cairo.Color (0, 0, 1) : Styles.TabBarActiveTextColor;
					color = color.MultiplyAlpha (tab.Opacity);
					lg.AddColorStop (0, color);
					color.A = 0;
					lg.AddColorStop (1, color);
					ctx.SetSource (lg);
					Pango.CairoHelper.ShowLayoutLine (ctx, la.GetLine (0));
				}
			}
			la.Dispose ();
		}

		void DrawTab (Context ctx, DockNotebookTab tab, Gdk.Rectangle allocation, Gdk.Rectangle tabBounds, bool highlight, bool active, bool dragging, Pango.Layout la)
		{
			// This logic is stupid to have here, should be in the caller!
			if (dragging) {
				tabBounds.X = (int)(tabBounds.X + (dragX - tabBounds.X) * dragXProgress);
				tabBounds.X = Clamp (tabBounds.X, tabStartX, tabEndX - tabBounds.Width);
			}
			double rightPadding = (active ? TabActivePadding.Right : TabPadding.Right) - (LeanWidth / 2);
			rightPadding = (rightPadding * Math.Min (1.0, Math.Max (0.5, (tabBounds.Width - 30) / 70.0)));
			double leftPadding = (active ? TabActivePadding.Left : TabPadding.Left) - (LeanWidth / 2);
			leftPadding = (leftPadding * Math.Min (1.0, Math.Max (0.5, (tabBounds.Width - 30) / 70.0)));
			double bottomPadding = active ? TabActivePadding.Bottom : TabPadding.Bottom;

			DrawTabBackground (this, ctx, allocation, tabBounds.Width, tabBounds.X, active);

			ctx.LineWidth = 1;
			ctx.NewPath ();

			// Render Close Button (do this first so we can tell how much text to render)

			var closeButtonAlloation = new Cairo.Rectangle (tabBounds.Right - rightPadding - (tabCloseImage.Width / 2) - CloseButtonMarginRight,
			                                 tabBounds.Height - bottomPadding - tabCloseImage.Height - CloseButtonMarginBottom,
			                                 tabCloseImage.Width, tabCloseImage.Height);
			
			tab.CloseButtonActiveArea = closeButtonAlloation.Inflate (2, 2);

			bool closeButtonHovered = tracker.Hovered && tab.CloseButtonActiveArea.Contains (tracker.MousePosition);
			bool tabHovered = tracker.Hovered && tab.Allocation.Contains (tracker.MousePosition);
			bool drawCloseButton = active || tabHovered;

			if (!closeButtonHovered && tab.DirtyStrength > 0.5) {
				ctx.DrawImage (this, tabDirtyImage, closeButtonAlloation.X, closeButtonAlloation.Y);
				drawCloseButton = false;
			}

			if (drawCloseButton)
				ctx.DrawImage (this, tabCloseImage.WithAlpha ((closeButtonHovered ? 1.0 : 0.5) * tab.Opacity), closeButtonAlloation.X, closeButtonAlloation.Y);
			
			// Render Text
			double tw = tabBounds.Width - (leftPadding + rightPadding);
			if (drawCloseButton || tab.DirtyStrength > 0.5)
				tw -= closeButtonAlloation.Width / 2;

			double tx = tabBounds.X + leftPadding;
			var baseline = la.GetLine (0).Layout.GetPixelBaseline ();
			double ty = tabBounds.Height - bottomPadding - baseline;

			ctx.MoveTo (tx, ty);
			if (!MonoDevelop.Core.Platform.IsMac && !MonoDevelop.Core.Platform.IsWindows) {
				// This is a work around for a linux specific problem.
				// A bug in the proprietary ATI driver caused TAB text not to draw.
				// If that bug get's fixed remove this HACK asap.
				la.Ellipsize = Pango.EllipsizeMode.End;
				la.Width = (int)(tw * Pango.Scale.PangoScale);
				ctx.SetSourceColor ((tab.Notify ? Styles.TabBarNotifyTextColor : (active ? Styles.TabBarActiveTextColor : Styles.TabBarInactiveTextColor)).ToCairoColor ());
				Pango.CairoHelper.ShowLayout (ctx, la.GetLine (0).Layout);
			} else {
				// ellipses are for space wasting ..., we cant afford that
				using (var lg = new LinearGradient (tx + tw - 10, 0, tx + tw, 0)) {
					var color = (tab.Notify ? Styles.TabBarNotifyTextColor : (active ? Styles.TabBarActiveTextColor : Styles.TabBarInactiveTextColor)).ToCairoColor ();
					color = color.MultiplyAlpha (tab.Opacity);
					lg.AddColorStop (0, color);
					color.A = 0;
					lg.AddColorStop (1, color);
					ctx.SetSource (lg);
					Pango.CairoHelper.ShowLayout (ctx, la.GetLine (0).Layout);
				}
			}
            la.Dispose ();
		}