Supporting Controls

There are two controls that support the ZoomContentControl that can be used independently, as needed. This topic covers these controls and their options.

PanPad

The PanPad control allows continuous and directional scrolling using the mouse. Once the control has been clicked it will continuously raise the Pan event while the mouse button is held down.

The offsets of the Pan event are calculated using the mouse click location and the current mouse location, which includes both a direction and a magnitude. The offsets can be limited using the MaxOffset property.

Finally, the interval at which the Pan event is raised can be customized using the Interval property.

ZoomDecorator

The ZoomContentControl uses a ZoomDecorator in the default control template to display its content. The ZoomDecorator can be used to zoom or pan a UIElement, much like the ZoomContentControl, but does not offer any built-in user interaction (such as mouse interaction, scrollbars, or the view control pane). The view can still be programmatically zoomed or panned.

Since ZoomDecorator implements IScrollInfo, it can be wrapped in a ScrollViewer if only scrollbars are needed. The only requirement is that ScrollViewer.CanContentScroll be set to true.