IScrollInfo Interface
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Represents the main scrollable region inside a ScrollViewer control.
Assembly: System.Windows (in System.Windows.dll)
The IScrollInfo type exposes the following members.
| 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. |
| 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. |
| MouseWheelLeft | Scrolls left within the content. |
| MouseWheelRight | Scrolls right within the content. |
| MouseWheelUp | Scrolls up within the content. |
| 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. |
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.
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.