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primarykey
Id
6355722
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0
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2011-06-15T09:34:50
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2011-06-15T09:34:50
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685535
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653918
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7
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text
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Here is what I did. Created a MarkupExtension that converts Font size to EM based on font assigned on Window. I would like to thank <a href="http://10rem.net/blog/2011/03/09/creating-a-custom-markup-extension-in-wpf-and-soon-silverlight" rel="noreferrer">http://10rem.net/blog/2011/03/09/creating-a-custom-markup-extension-in-wpf-and-soon-silverlight</a> and <a href="http://tomlev2.wordpress.com/tag/markup-extension/" rel="noreferrer">http://tomlev2.wordpress.com/tag/markup-extension/</a> for providing required knowledge. <pre><code>[MarkupExtensionReturnType(typeof(double))] public class EmFontSize : MarkupExtension { public EmFontSize() { } public EmFontSize(double size) { Size = size; } [ConstructorArgument("size")] public double Size { get; set; } public override object ProvideValue(IServiceProvider serviceProvider) { if (serviceProvider == null) return null; // get the target of the extension from the IServiceProvider interface IProvideValueTarget ipvt = (IProvideValueTarget)serviceProvider.GetService(typeof(IProvideValueTarget)); if (ipvt.TargetObject.GetType().FullName == "System.Windows.SharedDp") return this; DependencyObject targetObject = ipvt.TargetObject as DependencyObject; var window = TryFindParent<Window>(targetObject); if (window != null) { return window.FontSize * Size; } return 12 * Size; } public static T TryFindParent<T>(DependencyObject child) where T : DependencyObject { //get parent item DependencyObject parentObject = GetParentObject(child); //we've reached the end of the tree if (parentObject == null) return null; //check if the parent matches the type we're looking for T parent = parentObject as T; if (parent != null) { return parent; } else { //use recursion to proceed with next level return TryFindParent<T>(parentObject); } } public static DependencyObject GetParentObject(DependencyObject child) { if (child == null) return null; //handle content elements separately ContentElement contentElement = child as ContentElement; if (contentElement != null) { DependencyObject parent = ContentOperations.GetParent(contentElement); if (parent != null) return parent; FrameworkContentElement fce = contentElement as FrameworkContentElement; return fce != null ? fce.Parent : null; } //also try searching for parent in framework elements (such as DockPanel, etc) FrameworkElement frameworkElement = child as FrameworkElement; if (frameworkElement != null) { DependencyObject parent = frameworkElement.Parent; if (parent != null) return parent; } //if it's not a ContentElement/FrameworkElement, rely on VisualTreeHelper return VisualTreeHelper.GetParent(child); } } </code></pre> Sample Usage <pre><code>xmlns:my="clr-namespace:FontSizeExample" <TextBlock Text="Sample Font" FontSize="{my:EmFontSize 1.1}"/> <TextBlock Text="Sample Font" FontSize="{my:EmFontSize .9}"/> </code></pre>
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1. POWPF analogy for 'em' unit
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1. USAshish
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