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Replace various WPF include files with content (#1335)

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* tla2sharptla-ui-md.md

* tla2sharptla-uiautomation-md.md

* tla2sharptla-winclient-md.md

* tla2sharptla-xaml-md.md

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* fix warnings
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Andy (Steve) De George
2022-03-16 12:14:11 -04:00
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dotnet-desktop-guide/framework/wpf/controls/scrollviewer-overview.md
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---
# ScrollViewer Overview
Content within a user interface is often larger than a computer screen's display area. The <xref:System.Windows.Controls.ScrollViewer> control provides a convenient way to enable scrolling of content in [!INCLUDE[TLA#tla_winclient](../../../includes/tlasharptla-winclient-md.md)] applications. This topic introduces the <xref:System.Windows.Controls.ScrollViewer> element and provides several usage examples.
Content within a user interface is often larger than a computer screen's display area. The <xref:System.Windows.Controls.ScrollViewer> control provides a convenient way to enable scrolling of content in Windows Presentation Foundation (WPF) applications. This topic introduces the <xref:System.Windows.Controls.ScrollViewer> element and provides several usage examples.
<a name="what_is_a_scrollviewer_element"></a>
## The ScrollViewer Control
There are two predefined elements that enable scrolling in [!INCLUDE[TLA2#tla_winclient](../../../includes/tla2sharptla-winclient-md.md)] applications: <xref:System.Windows.Controls.Primitives.ScrollBar> and <xref:System.Windows.Controls.ScrollViewer>. The <xref:System.Windows.Controls.ScrollViewer> control encapsulates horizontal and vertical <xref:System.Windows.Controls.Primitives.ScrollBar> elements and a content container (such as a <xref:System.Windows.Controls.Panel> element) in order to display other visible elements in a scrollable area. You must build a custom object in order to use the <xref:System.Windows.Controls.Primitives.ScrollBar> element for content scrolling. However, you can use the <xref:System.Windows.Controls.ScrollViewer> element by itself because it is a composite control that encapsulates <xref:System.Windows.Controls.Primitives.ScrollBar> functionality.
There are two predefined elements that enable scrolling in WPF applications: <xref:System.Windows.Controls.Primitives.ScrollBar> and <xref:System.Windows.Controls.ScrollViewer>. The <xref:System.Windows.Controls.ScrollViewer> control encapsulates horizontal and vertical <xref:System.Windows.Controls.Primitives.ScrollBar> elements and a content container (such as a <xref:System.Windows.Controls.Panel> element) in order to display other visible elements in a scrollable area. You must build a custom object in order to use the <xref:System.Windows.Controls.Primitives.ScrollBar> element for content scrolling. However, you can use the <xref:System.Windows.Controls.ScrollViewer> element by itself because it is a composite control that encapsulates <xref:System.Windows.Controls.Primitives.ScrollBar> functionality.
The <xref:System.Windows.Controls.ScrollViewer> control responds to both mouse and keyboard commands, and defines numerous methods with which to scroll content by predetermined increments. You can use the <xref:System.Windows.Controls.ScrollViewer.ScrollChanged> event to detect a change in a <xref:System.Windows.Controls.ScrollViewer> state.
@@ -29,7 +29,7 @@ Content within a user interface is often larger than a computer screen's display
## Physical vs. Logical Scrolling
Physical scrolling is used to scroll content by a predetermined physical increment, typically by a value that is declared in pixels. Logical scrolling is used to scroll to the next item in the logical tree. Physical scrolling is the default scroll behavior for most <xref:System.Windows.Controls.Panel> elements. [!INCLUDE[TLA2#tla_winclient](../../../includes/tla2sharptla-winclient-md.md)] supports both types of scrolling.
Physical scrolling is used to scroll content by a predetermined physical increment, typically by a value that is declared in pixels. Logical scrolling is used to scroll to the next item in the logical tree. Physical scrolling is the default scroll behavior for most <xref:System.Windows.Controls.Panel> elements. WPF supports both types of scrolling.
#### The IScrollInfo Interface