Work on TextAlignment

Cairo/Perspex.Cairo/CairoExtensions.cs

@@ -56,5 +56,16 @@ namespace Perspex.Cairo
 
             return Pango.Weight.Ultralight;
         }
+
+        public static Pango.Alignment ToCairo(this Perspex.Media.TextAlignment alignment)
+        {
+            if (alignment == Perspex.Media.TextAlignment.Left)
+                return Pango.Alignment.Left;
+
+            if (alignment == Perspex.Media.TextAlignment.Centered)
+                return Pango.Alignment.Center;
+
+            return Pango.Alignment.Right;
+        }
     }
 }

Cairo/Perspex.Cairo/CairoPlatform.cs

@@ -35,9 +35,10 @@ namespace Perspex.Cairo
             string fontFamily, 
             double fontSize, 
             FontStyle fontStyle,
+            TextAlignment textAlignment,
             Perspex.Media.FontWeight fontWeight)
         {
-            return new FormattedTextImpl(text, fontFamily, fontSize, fontStyle, fontWeight);
+            return new FormattedTextImpl(text, fontFamily, fontSize, fontStyle, textAlignment, fontWeight);
         }
 
         public IRenderer CreateRenderer(IPlatformHandle handle, double width, double height)

Cairo/Perspex.Cairo/Media/FormattedTextImpl.cs

@@ -20,6 +20,7 @@ namespace Perspex.Cairo.Media
             string fontFamily,
             double fontSize,
             FontStyle fontStyle,
+            TextAlignment textAlignment,
             FontWeight fontWeight)
         {
             var context = Locator.Current.GetService<Pango.Context>();
@@ -32,6 +33,8 @@ namespace Perspex.Cairo.Media
                 Style = (Pango.Style)fontStyle,
                 Weight = fontWeight.ToCairo()
             };
+
+            this.Layout.Alignment = textAlignment.ToCairo();
         }
 
         public Size Constraint
@@ -43,6 +46,7 @@ namespace Perspex.Cairo.Media
 
             set
             {
+
                 this.Layout.Width = Pango.Units.FromDouble(value.Width);
             }
         }
@@ -98,6 +102,12 @@ namespace Perspex.Cairo.Media
             int width;
             int height;
             this.Layout.GetPixelSize(out width, out height);
+        
+            if (this.Layout.Alignment == Pango.Alignment.Right)
+            {
+                return new Size(width, height);
+            }
+
             return new Size(width, height);
         }
 

Perspex.Controls/Presenters/TextPresenter.cs

@@ -165,6 +165,7 @@ namespace Perspex.Controls.Presenters
                     this.FontFamily,
                     this.FontSize,
                     this.FontStyle,
+                    TextAlignment.Left,
                     this.FontWeight))
                 {
                     return formattedText.Measure();

Perspex.Controls/TextBlock.cs

@@ -37,6 +37,9 @@ namespace Perspex.Controls
         public static readonly PerspexProperty<TextWrapping> TextWrappingProperty =
             PerspexProperty.Register<TextBlock, TextWrapping>("TextWrapping");
 
+        public static readonly PerspexProperty<TextAlignment> TextAlignmentProperty =
+            PerspexProperty.Register<TextBlock, TextAlignment>("TextAlignment");
+
         private FormattedText formattedText;
 
         private Size constraint;
@@ -45,6 +48,7 @@ namespace Perspex.Controls
         {
             Observable.Merge(
                 this.GetObservable(TextProperty).Select(_ => Unit.Default),
+                this.GetObservable(TextAlignmentProperty).Select(_ => Unit.Default),
                 this.GetObservable(FontSizeProperty).Select(_ => Unit.Default),
                 this.GetObservable(FontStyleProperty).Select(_ => Unit.Default))
                 .Subscribe(_ =>
@@ -114,6 +118,12 @@ namespace Perspex.Controls
             set { this.SetValue(TextWrappingProperty, value); }
         }
 
+        public TextAlignment TextAlignment
+        {
+            get { return this.GetValue(TextAlignmentProperty); }
+            set { this.SetValue(TextAlignmentProperty, value); }
+        }
+
         public override void Render(IDrawingContext context)
         {
             Brush background = this.Background;
@@ -133,6 +143,7 @@ namespace Perspex.Controls
                 this.FontFamily,
                 this.FontSize,
                 this.FontStyle,
+                this.TextAlignment,
                 this.FontWeight);
             result.Constraint = this.constraint;
             return result;

Perspex.SceneGraph/Media/FontStyle.cs

@@ -12,4 +12,11 @@ namespace Perspex.Media
         Oblique,
         Italic,
     }
+
+    public enum TextAlignment
+    {
+        Left,
+        Centered,
+        Right,
+    }
 }

Perspex.SceneGraph/Media/FormattedText.cs

@@ -18,6 +18,7 @@ namespace Perspex.Media
             string fontFamilyName,
             double fontSize,
             FontStyle fontStyle,
+            TextAlignment textAlignment,
             FontWeight fontWeight)
         {
             this.Text = text;
@@ -32,6 +33,7 @@ namespace Perspex.Media
                 fontFamilyName, 
                 fontSize, 
                 fontStyle, 
+                textAlignment,
                 fontWeight);
         }
 

Perspex.SceneGraph/Platform/IPlatformRenderInterface.cs

@@ -17,6 +17,7 @@ namespace Perspex.Platform
             string fontFamily, 
             double fontSize, 
             FontStyle fontStyle,
+            TextAlignment textAlignment,
             FontWeight fontWeight);
 
         IStreamGeometryImpl CreateStreamGeometry();