我尝试使用Windows Phone 8应用中的TextBlocks缺少CharacterEllipsis扩展我的应用。我在这里找到了一个很好的解决方案：http://nerdplusart.com/texttrimming-textblock-for-silverlight/。
所以我在我的代码中实现了这个：
public class DynamicTextBlock : ContentControl
{
#region Text (DependencyProperty)
/// <summary>
/// Gets or sets the Text DependencyProperty. This is the text that will be displayed.
/// </summary>
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(DynamicTextBlock),
new PropertyMetadata(null, new PropertyChangedCallback(OnTextChanged)));
private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((DynamicTextBlock)d).OnTextChanged(e);
}
protected virtual void OnTextChanged(DependencyPropertyChangedEventArgs e)
{
this.InvalidateMeasure();
}
#endregion
#region TextWrapping (DependencyProperty)
/// <summary>
/// Gets or sets the TextWrapping property. This corresponds to TextBlock.TextWrapping.
/// </summary>
public TextWrapping TextWrapping
{
get { return (TextWrapping)GetValue(TextWrappingProperty); }
set { SetValue(TextWrappingProperty, value); }
}
public static readonly DependencyProperty TextWrappingProperty =
DependencyProperty.Register("TextWrapping", typeof(TextWrapping), typeof(DynamicTextBlock),
new PropertyMetadata(TextWrapping.NoWrap, new PropertyChangedCallback(OnTextWrappingChanged)));
private static void OnTextWrappingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((DynamicTextBlock)d).OnTextWrappingChanged(e);
}
protected virtual void OnTextWrappingChanged(DependencyPropertyChangedEventArgs e)
{
this.textBlock.TextWrapping = (TextWrapping)e.NewValue;
this.InvalidateMeasure();
}
#endregion
#region LineHeight (DependencyProperty)
/// <summary>
/// Gets or sets the LineHeight property. This property corresponds to TextBlock.LineHeight;
/// </summary>
public double LineHeight
{
get { return (double)GetValue(LineHeightProperty); }
set { SetValue(LineHeightProperty, value); }
}
public static readonly DependencyProperty LineHeightProperty =
DependencyProperty.Register("LineHeight", typeof(double), typeof(DynamicTextBlock),
new PropertyMetadata(0.0, new PropertyChangedCallback(OnLineHeightChanged)));
private static void OnLineHeightChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((DynamicTextBlock)d).OnLineHeightChanged(e);
}
protected virtual void OnLineHeightChanged(DependencyPropertyChangedEventArgs e)
{
textBlock.LineHeight = LineHeight;
this.InvalidateMeasure();
}
#endregion
#region LineStackingStrategy (DependencyProperty)
/// <summary>
/// Gets or sets the LineStackingStrategy DependencyProperty. This corresponds to TextBlock.LineStackingStrategy.
/// </summary>
public LineStackingStrategy LineStackingStrategy
{
get { return (LineStackingStrategy)GetValue(LineStackingStrategyProperty); }
set { SetValue(LineStackingStrategyProperty, value); }
}
public static readonly DependencyProperty LineStackingStrategyProperty =
DependencyProperty.Register("LineStackingStrategy", typeof(LineStackingStrategy), typeof(DynamicTextBlock),
new PropertyMetadata(LineStackingStrategy.BlockLineHeight, new PropertyChangedCallback(OnLineStackingStrategyChanged)));
private static void OnLineStackingStrategyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((DynamicTextBlock)d).OnLineStackingStrategyChanged(e);
}
protected virtual void OnLineStackingStrategyChanged(DependencyPropertyChangedEventArgs e)
{
this.textBlock.LineStackingStrategy = (LineStackingStrategy)e.NewValue;
this.InvalidateMeasure();
}
#endregion
/// <summary>
/// A TextBlock that gets set as the control's content and is ultiately the control
/// that displays our text
/// </summary>
private TextBlock textBlock;
/// <summary>
/// Initializes a new instance of the DynamicTextBlock class
/// </summary>
public DynamicTextBlock()
{
// create our textBlock and initialize
this.textBlock = new TextBlock();
this.Content = this.textBlock;
}
/// <summary>
/// Handles the measure part of the measure and arrange layout process. During this process
/// we measure the textBlock that we've created as content with increasingly smaller amounts
/// of text until we find text that fits.
/// </summary>
/// <param name="availableSize">the available size</param>
/// <returns>the base implementation of Measure</returns>
protected override Size MeasureOverride(Size availableSize)
{
// just to make the code easier to read
bool wrapping = this.TextWrapping == TextWrapping.Wrap;
Size unboundSize = wrapping ? new Size(availableSize.Width, double.PositiveInfinity) : new Size(double.PositiveInfinity, availableSize.Height);
string reducedText = this.Text;
// set the text and measure it to see if it fits without alteration
this.textBlock.Text = reducedText;
Size textSize = base.MeasureOverride(unboundSize);
while (wrapping ? textSize.Height > availableSize.Height : textSize.Width > availableSize.Width)
{
int prevLength = reducedText.Length;
reducedText = this.ReduceText(reducedText);
if (reducedText.Length == prevLength)
{
break;
}
this.textBlock.Text = reducedText + "...";
textSize = base.MeasureOverride(unboundSize);
}
return base.MeasureOverride(availableSize);
}
/// <summary>
/// Reduces the length of the text. Derived classes can override this to use different techniques
/// for reducing the text length.
/// </summary>
/// <param name="text">the original text</param>
/// <returns>the reduced length text</returns>
protected virtual string ReduceText(string text)
{
return text.Substring(0, text.Length - 1);
}
}
在我的XAML中，我使用这个：
<myNamespace:DynamicTextBlock Grid.Column="0" Text="Dies ist ein Text der sehr lang ist und umebrochen wird" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="-1,0,0,0" Foreground="{Binding IsHighlighted, Converter={StaticResource BoolToBrushConverter}}" FontSize="32" />
一切都很酷。现在我想对此应用Style。但以下方法不起作用：
Style="{StaticResource PhoneTextLargeStyle}"
如何扩展解决方案以接受StaticRessource作为Style？
答案 0 :(得分：0)
Windows Phone中的样式有TargetType，它们只能设置为该类型的控件或其子类型（子类）。 PhoneTextLargeStyle的目标是TextBlock，因此您无法将其置于其他控件上（例如DynamicTextBlock）。
您需要创建一个定位DynamicTextBlock的新样式并设置您喜欢的值。我想你可以找到PhoneTextLargeStyle风格的方式。