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11/18/2011

IScrollInfo Interface

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents the main scrollable region inside a ScrollViewer control.

Namespace: System.Windows.Controls.Primitives
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public Interface IScrollInfo

public interface IScrollInfo

The IScrollInfo type exposes the following members.

Properties

	Name	Description
	CanHorizontallyScroll	Gets or sets a value that indicates whether scrolling on the horizontal axis is possible.
	CanVerticallyScroll	Gets or sets a value that indicates whether scrolling on the vertical axis is possible.
	ExtentHeight	Gets the vertical size of the extent.
	ExtentWidth	Gets the horizontal size of the extent.
	HorizontalOffset	Gets the horizontal offset of the scrolled content.
	ScrollOwner	Gets or sets a ScrollViewer element that controls scrolling behavior.
	VerticalOffset	Gets the vertical offset of the scrolled content.
	ViewportHeight	Gets the vertical size of the viewport for this content.
	ViewportWidth	Gets the horizontal size of the viewport for this content.

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Methods

	Name	Description
	LineDown	Scrolls down within the content by one logical unit.
	LineLeft	Scrolls left within the content by one logical unit.
	LineRight	Scrolls right within the content by one logical unit.
	LineUp	Scrolls up within the content by one logical unit.
	MakeVisible	Forces content to scroll until the coordinate space of a visual object is visible.
	MouseWheelDown	Scrolls down within the content after the user clicks the wheel button on a mouse.
	MouseWheelLeft	Scrolls left within the content after the user clicks the wheel button on a mouse.
	MouseWheelRight	Scrolls right within the content after the user clicks the wheel button on a mouse.
	MouseWheelUp	Scrolls up within the content after the user clicks the wheel button on a mouse.
	PageDown	Scrolls down within the content by one page.
	PageLeft	Scrolls left within the content by one page.
	PageRight	Scrolls right within the content by one page.
	PageUp	Scrolls up within the content by one page.
	SetHorizontalOffset	Sets the amount of horizontal offset.
	SetVerticalOffset	Sets the amount of vertical offset.

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Remarks

The IScrollInfo interface exposes access to methods that enable logical scrolling of child content, as well as, computing which child elements are visible. In addition, it defines properties used to define the scrollable region.

Logical scrolling enables scrolling to the next element in the logical tree. In contrast, physical scrolling scrolls content by a defined measurable increment in a specified direction.

Examples

The following example uses virtualization to only instantiate the objects that are currently in view. The example implements the IScrollInfo interface to create a custom panel that derives from VirtualizingStackPanel.

Run this sample

Download Sample

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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