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path: root/Xamarin.Forms.Platform.WP8/LabelRenderer.cs
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Diffstat (limited to 'Xamarin.Forms.Platform.WP8/LabelRenderer.cs')
-rw-r--r--Xamarin.Forms.Platform.WP8/LabelRenderer.cs187
1 files changed, 187 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.WP8/LabelRenderer.cs b/Xamarin.Forms.Platform.WP8/LabelRenderer.cs
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+++ b/Xamarin.Forms.Platform.WP8/LabelRenderer.cs
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+´╗┐using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Media;
+
+namespace Xamarin.Forms.Platform.WinPhone
+{
+ public static class FormattedStringExtensions
+ {
+ public static IEnumerable<Inline> ToInlines(this FormattedString formattedString)
+ {
+ foreach (Span span in formattedString.Spans)
+ yield return span.ToRun();
+ }
+
+ public static Run ToRun(this Span span)
+ {
+ var run = new Run { Text = span.Text };
+
+ if (span.ForegroundColor != Color.Default)
+ run.Foreground = span.ForegroundColor.ToBrush();
+
+ if (!span.IsDefault())
+ run.ApplyFont(span.Font);
+
+ return run;
+ }
+ }
+
+ public class LabelRenderer : ViewRenderer<Label, TextBlock>
+ {
+ bool _fontApplied;
+
+ protected override System.Windows.Size ArrangeOverride(System.Windows.Size finalSize)
+ {
+ if (Element == null)
+ return finalSize;
+ double childHeight = Math.Max(0, Math.Min(Element.Height, Control.DesiredSize.Height));
+ var rect = new Rect();
+
+ switch (Element.VerticalTextAlignment)
+ {
+ case TextAlignment.Start:
+ break;
+ default:
+ case TextAlignment.Center:
+ rect.Y = (int)((finalSize.Height - childHeight) / 2);
+ break;
+ case TextAlignment.End:
+ rect.Y = finalSize.Height - childHeight;
+ break;
+ }
+ rect.Height = childHeight;
+ rect.Width = finalSize.Width;
+ Control.Arrange(rect);
+ return finalSize;
+ }
+
+ protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
+ {
+ base.OnElementChanged(e);
+
+ var textBlock = new TextBlock { Foreground = (Brush)System.Windows.Application.Current.Resources["PhoneForegroundBrush"] };
+ UpdateText(textBlock);
+ UpdateColor(textBlock);
+ UpdateAlign(textBlock);
+ UpdateFont(textBlock);
+ UpdateLineBreakMode(textBlock);
+ SetNativeControl(textBlock);
+ }
+
+ protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+ {
+ if (e.PropertyName == Label.TextProperty.PropertyName || e.PropertyName == Label.FormattedTextProperty.PropertyName)
+ UpdateText(Control);
+ else if (e.PropertyName == Label.TextColorProperty.PropertyName)
+ UpdateColor(Control);
+ else if (e.PropertyName == Label.HorizontalTextAlignmentProperty.PropertyName || e.PropertyName == Label.VerticalTextAlignmentProperty.PropertyName)
+ UpdateAlign(Control);
+ else if (e.PropertyName == Label.FontProperty.PropertyName)
+ UpdateFont(Control);
+ else if (e.PropertyName == Label.LineBreakModeProperty.PropertyName)
+ UpdateLineBreakMode(Control);
+ base.OnElementPropertyChanged(sender, e);
+ }
+
+ void UpdateAlign(TextBlock textBlock)
+ {
+ if (textBlock == null)
+ return;
+
+ Label label = Element;
+ if (label == null)
+ return;
+
+ textBlock.TextAlignment = label.HorizontalTextAlignment.ToNativeTextAlignment();
+ textBlock.VerticalAlignment = label.VerticalTextAlignment.ToNativeVerticalAlignment();
+ }
+
+ void UpdateColor(TextBlock textBlock)
+ {
+ if (textBlock == null)
+ return;
+
+ Label label = Element;
+ if (label != null && label.TextColor != Color.Default)
+ textBlock.Foreground = label.TextColor.ToBrush();
+ else
+ textBlock.Foreground = (Brush)System.Windows.Application.Current.Resources["PhoneForegroundBrush"];
+ }
+
+ void UpdateFont(TextBlock textBlock)
+ {
+ if (textBlock == null)
+ return;
+
+ Label label = Element;
+ if (label == null || (label.IsDefault() && !_fontApplied))
+ return;
+
+ Font fontToApply = label.IsDefault() ? Font.SystemFontOfSize(NamedSize.Medium) : label.Font;
+
+ textBlock.ApplyFont(fontToApply);
+ _fontApplied = true;
+ }
+
+ void UpdateLineBreakMode(TextBlock textBlock)
+ {
+ if (textBlock == null)
+ return;
+
+ switch (Element.LineBreakMode)
+ {
+ case LineBreakMode.NoWrap:
+ textBlock.TextTrimming = TextTrimming.None;
+ textBlock.TextWrapping = TextWrapping.NoWrap;
+ break;
+ case LineBreakMode.WordWrap:
+ textBlock.TextTrimming = TextTrimming.None;
+ textBlock.TextWrapping = TextWrapping.Wrap;
+ break;
+ case LineBreakMode.CharacterWrap:
+ textBlock.TextTrimming = TextTrimming.WordEllipsis;
+ textBlock.TextWrapping = TextWrapping.Wrap;
+ break;
+ case LineBreakMode.HeadTruncation:
+ textBlock.TextTrimming = TextTrimming.WordEllipsis;
+ textBlock.TextWrapping = TextWrapping.NoWrap;
+ break;
+ case LineBreakMode.TailTruncation:
+ textBlock.TextTrimming = TextTrimming.WordEllipsis;
+ textBlock.TextWrapping = TextWrapping.NoWrap;
+ break;
+ case LineBreakMode.MiddleTruncation:
+ textBlock.TextTrimming = TextTrimming.WordEllipsis;
+ textBlock.TextWrapping = TextWrapping.NoWrap;
+ break;
+ default:
+ throw new ArgumentOutOfRangeException();
+ }
+ }
+
+ void UpdateText(TextBlock textBlock)
+ {
+ if (textBlock == null)
+ return;
+
+ Label label = Element;
+ if (label != null)
+ {
+ if (label.FormattedText == null)
+ textBlock.Text = label.Text;
+ else
+ {
+ FormattedString formattedText = label.FormattedText ?? label.Text;
+
+ textBlock.Inlines.Clear();
+ foreach (Inline inline in formattedText.ToInlines())
+ textBlock.Inlines.Add(inline);
+ }
+ }
+ }
+ }
+} \ No newline at end of file