Finally rendering text on linux!

(very ugly and in-the-wrong place text)

Cairo/Perspex.Cairo/CairoPlatform.cs

@@ -40,6 +40,11 @@ namespace Perspex.Cairo
 
         public IRenderer CreateRenderer(IPlatformHandle handle, double width, double height)
         {
+            if (textService.Context == null)
+            {
+                textService.Context = GetPangoContext(handle);
+            }
+
             return new Renderer(handle, width, height);
         }
 
@@ -60,5 +65,19 @@ namespace Perspex.Cairo
             ImageSurface result = new ImageSurface(fileName);
             return new BitmapImpl(result);
         }
+
+        private Pango.Context GetPangoContext(IPlatformHandle handle)
+        {
+            switch (handle.HandleDescriptor)
+            {
+                case "GtkWindow":
+                    var window = GLib.Object.GetObject(handle.Handle) as Gtk.Window;
+                    return window.PangoContext;
+                default:
+                    throw new NotSupportedException(string.Format(
+                        "Don't know how to get a Pango Context from a '{0}'.",
+                        handle.HandleDescriptor));
+            }
+        }
     }
 }

Cairo/Perspex.Cairo/Media/DrawingContext.cs

@@ -121,7 +121,11 @@ namespace Perspex.Cairo.Media
         /// <param name="text">The text.</param>
         public void DrawText(Perspex.Media.Brush foreground, Rect rect, FormattedText text)
         {
-            // TODO: Implement
+            this.SetBrush(foreground);
+            this.context.MoveTo(rect.X, rect.Bottom);
+            this.context.SelectFontFace(text.FontFamilyName, (FontSlant)text.FontStyle, FontWeight.Normal);
+            this.context.SetFontSize(text.FontSize);
+            this.context.ShowText(text.Text);
         }
 
         /// <summary>

Cairo/Perspex.Cairo/Media/TextService.cs

@@ -8,13 +8,23 @@ namespace Perspex.Cairo.Media
 {
     using System;
     using System.Linq;
+    using System.Runtime.InteropServices;
     using Perspex.Media;
     using Perspex.Platform;
 
     public class TextService : ITextService
     {
-        public TextService()
+        /// <summary>
+        /// Gets the pango context to be used by the service.
+        /// </summary>
+        /// <remarks>>
+        /// There seems to be no way in GtkSharp to create a new Pango Context, so this has to
+        /// be injected by CairoPlatform the first time a renderer is created.
+        /// </remarks>
+        public Pango.Context Context
         {
+            get;
+            internal set;
         }
 
         public int GetCaretIndex(FormattedText text, Point point, Size constraint)
@@ -34,7 +44,30 @@ namespace Perspex.Cairo.Media
 
         public Size Measure(FormattedText text, Size constraint)
         {
-            return new Size(100, 30);
+            var layout = this.CreateLayout(text);
+
+            Pango.Rectangle inkRect;
+            Pango.Rectangle logicalRect;
+            layout.GetExtents(out inkRect, out logicalRect);
+
+            return new Size(Pango.Units.ToDouble(inkRect.Width), Pango.Units.ToDouble(inkRect.Height));
+        }
+
+        private Pango.Layout CreateLayout(FormattedText text)
+        {
+            var layout = new Pango.Layout(this.Context)
+            {
+                FontDescription = new Pango.FontDescription
+                {
+                    Family = text.FontFamilyName,
+                    Size = Pango.Units.FromDouble(text.FontSize),
+                    Style = (Pango.Style)text.FontStyle,
+                }
+            };
+
+            layout.SetText(text.Text);
+
+            return layout;
         }
     }
 }

Cairo/Perspex.Cairo/Perspex.Cairo.csproj

@@ -30,9 +30,15 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL" />
+    <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL">
-    <Reference Include="glib-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL" />
+      <Package>gtk-sharp-2.0</Package>
-    <Reference Include="gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL" />
+    </Reference>
+    <Reference Include="glib-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL">
+      <Package>glib-sharp-2.0</Package>
+    </Reference>
+    <Reference Include="gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL">
+      <Package>gtk-sharp-2.0</Package>
+    </Reference>
     <Reference Include="pango-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f, processorArchitecture=MSIL">
       <Package>gtk-sharp-2.0</Package>
     </Reference>
@@ -53,6 +59,9 @@
     <Reference Include="System.Reactive.Interfaces">
       <HintPath>..\..\packages\Rx-Interfaces.2.2.5\lib\net45\System.Reactive.Interfaces.dll</HintPath>
     </Reference>
+    <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
+      <Package>gtk-sharp-2.0</Package>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CairoPlatform.cs" />

Perspex-Mono.userprefs

@@ -1,29 +1,28 @@
 <Properties GitUserInfo="UsingGIT">
   <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug" />
-  <MonoDevelop.Ide.Workbench ActiveDocument="Perspex.Base/Threading/MainLoop.cs">
+  <MonoDevelop.Ide.Workbench>
-    <Files>
-      <File FileName="Perspex.Base/Threading/MainLoop.cs" Line="18" Column="18" />
-    </Files>
     <Pads>
       <Pad Id="ProjectPad">
         <State expanded="True">
-          <Node name="Perspex.Base" expanded="True">
+          <Node name="Gtk" expanded="True">
-            <Node name="Threading" expanded="True">
+            <Node name="Perspex.Gtk" expanded="True">
-              <Node name="MainLoop.cs" selected="True" />
+              <Node name="Input" expanded="True" />
+              <Node name="WindowImpl.cs" selected="True" />
             </Node>
           </Node>
+          <Node name="Perspex.Base" expanded="True" />
+          <Node name="Perspex.Input" expanded="True">
+            <Node name="Raw" expanded="True" />
+          </Node>
           <Node name="TestApplication-Mono" expanded="True" />
         </State>
       </Pad>
-      <Pad Id="MonoDevelop.Debugger.WatchPad">
-        <State />
-      </Pad>
     </Pads>
   </MonoDevelop.Ide.Workbench>
   <MonoDevelop.Ide.DebuggingService.Breakpoints>
     <BreakpointStore>
       <Breakpoint file="/home/steven/projects/Perspex/Gtk/Perspex.Gtk/Window.cs" line="56" column="1" />
-      <Breakpoint file="/home/steven/projects/Perspex/Perspex.Base/Threading/MainLoop.cs" line="60" column="1" />
+      <Catchpoint exceptionName="System.Exception" includeSubclasses="True" />
     </BreakpointStore>
   </MonoDevelop.Ide.DebuggingService.Breakpoints>
   <MonoDevelop.Ide.DebuggingService.PinnedWatches />