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28 lines
2.4 KiB
Markdown
28 lines
2.4 KiB
Markdown
---
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title: "How to: Apply a FocusVisualStyle to a Control"
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ms.date: "03/30/2017"
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helpviewer_keywords:
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- "properties [WPF], FocusVisualStyle"
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- "FocusVisualStyle property [WPF]"
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ms.assetid: 363de99e-8ecc-438c-ac4a-f9147432ebd6
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---
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# How to: Apply a FocusVisualStyle to a Control
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This example shows you how to create a focus visual style in resources and apply the style to a control, using the <xref:System.Windows.FrameworkElement.FocusVisualStyle%2A> property.
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## Example
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The following example defines a style that creates additional control compositing that only applies when that control is keyboard focused in the [!INCLUDE[TLA#tla_ui](../../../includes/tlasharptla-ui-md.md)]. This is accomplished by defining a style with a <xref:System.Windows.Controls.ControlTemplate>, then referencing that style as a resource when setting the <xref:System.Windows.FrameworkElement.FocusVisualStyle%2A> property.
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An external rectangle resembling a border is placed outside of the rectangular area. Unless otherwise modified, the sizing of the style uses the <xref:System.Windows.FrameworkElement.ActualHeight%2A> and <xref:System.Windows.FrameworkElement.ActualWidth%2A> of the rectangular control where the focus visual style is applied. This example sets negative values for the <xref:System.Windows.FrameworkElement.Margin%2A> to make the border appear slightly outside the focused control.
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[!code-xaml[FEFocusVisualStyle#XAML](~/samples/snippets/csharp/VS_Snippets_Wpf/FEFocusVisualStyle/CS/page1.xaml#xaml)]
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A <xref:System.Windows.FrameworkElement.FocusVisualStyle%2A> is additive to any control template style that comes either from an explicit style or a theme style; the primary style for a control can still be created by using a <xref:System.Windows.Controls.ControlTemplate> and setting that style to the <xref:System.Windows.FrameworkElement.Style%2A> property.
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Focus visual styles should be used consistently across a theme or a UI, rather than using a different one for each focusable element. For details, see [Styling for Focus in Controls, and FocusVisualStyle](styling-for-focus-in-controls-and-focusvisualstyle.md).
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## See also
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- <xref:System.Windows.FrameworkElement.FocusVisualStyle%2A>
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- [Styling and Templating](/dotnet/desktop-wpf/fundamentals/styles-templates-overview)
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- [Styling for Focus in Controls, and FocusVisualStyle](styling-for-focus-in-controls-and-focusvisualstyle.md)
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