|
RadControls for ASP .NET AJAX version |
Q3 2010 and later
|
| .NET version |
3.5 and later
|
| Visual Studio version |
2008 and later
|
| Programming language |
C#
|
| Browser support |
all browsers supported by RadControls for ASP .NET AJAX
|
PROJECT DESCRIPTION
RadGrid for ASP.NET AJAX provides a handy
Items Drag-and-Drop functionality that allows you to drag items in or between RadGrid instances. As a visual indication of the dragged items, RadGrid creates copies of the selected items and moves them along with the mouse cursor on mouse move. This project demonstrates how the dragged content attached to the mouse cursor can be customized using an
ExtenderControl attached to RadGrid.
The
GridCustomDragExtender control that implements this behavior provides the
DragContentTemplate that allows you to define arbitrary content to be shown when grid items are dragged. This content is initially rendered hidden and shown upon dragging items from the RadGrid instance the extender is attached to. The
CursorOffsetLeft and
CursorOffsetTop properties specify the position of the dragged content relative to the mouse cursor.
On the client,
GridCustomDragExtender fires 2 events:
dragContentCreating and
drag. You can register event handlers for them through the extender's server-side
OnClientDragContentCreating and
OnClientDrag properties, respectively.
OnClientDragContentCreating is fired each time item drag is started before the custom content specified in
DragContentTemplate is shown on the page. In the event handler, you can access the dragged items collection and the content panel that contains your dragged content. This mechanism can be used to set any item-specific data inside the dragged content before it is rendered on the page.
OnClientDrag is fired with each
mousemove event during item drag.
The
GridCustomDragExtender provides a handy approach for defining and databinding custom drag content when dragging items in RadGrid.