DragDropManager provides a highly flexible collection of events, methods and properties for executing drag and drop operations in applications. The DragDropManager basically uses two classes for drag-drop events, methods and properties: C1DragDropManager and DragDropEventArgs.
The drag-and-drop processes using DragDropManager are basically event-driven. Both the drop target and drag source use a set of events to handle the drag and drop procedures.
| Events | Description |
| DragDrop | The DragDrop event is used at the end of a drag-drop process, when the user releases the mouse button on a registered drop target. |
| DragEnter | The DragEnter event is used during a drag-drop process, when the cursor enters a registered drop target. |
| DragLeave | The DragLeave event is used during a drag-drop process, when the cursor leaves a registered drop target. |
| DragOver | The DragOver event is used during a drag-drop process, when the cursor moves over a registered drop target. |
| DragStart | The DragStart event is used when a drag drop process begins. |
| DragAutoScroll | The DragAutoScroll fires after the C1DragDropManager automatically scrolls a ScrollViewer control in order to keep the drop location within view. |
DragDropManager uses a set of methods to execute drag-drop procedures.
| Methods | Description |
| RegisterDragSource | The RegisterDragSource method registers a UIElement to act as a drag source. This method passes three parameters, source, effect and keys. The source parameter is a UIElement that will act as a drag source. The effect parameter provides the DragDropEffect that will be supported by the source object. The keys parameter indicates the ModifierKeys that should be pressed in order for the drag operation to start. |
| RegisterDropTarget | The RegisterDropTarget method registers (or un-registers) an element as a drop target. This method passes two parameters, target and register. Here, target can be a UIElement that will act as a drop target, while the register parameter can be used to register or un-register the UIElement. |
| UnregisterDragSource | The UnregisterDragSource un-registers a UIElement as a drag source. |
| ClearSources | The ClearSources method removes all the registered sources. |
| ClearTargets | The ClearTargets method removes all the registered targets. |
DragDropManager uses a set of properties for drag source, drop target, scrollviewer etc.
| Properties | Description |
| DragSource | The DragSource property gets the UIElement that is acting as a drag source. |
| DropTarget | The DropTarget property gets the UIElement that is acting as a drop target. |
| Effect |
The Effect property gets or sets the DragDropEffect enumeration that will be applied when the user drops the DragSource element into the element. The drag source can be either copied or moved into a drop target element. |
| ScrollViewer | The ScrollViewer property gets or sets the DragDropEventArgs.ScrollViewer that will scroll automatically during the drag drop operation when the mouse is near its edge. Note that by default, C1DragDropManager selects the ScrollViewer by default. |
| DragThreshold | The DragThreshold property determines the drag behavior of the drag source. It gets or sets the distance in pixels that the mouse must move before a drag operation starts. |
| SourceMarker | The SourceMarker property gets a reference to the border used to highlight the drag source. |
| TargetMarker | The TargetMarker property gets the border used to indicate the drop target. |
The subtopic Drag Markers discuss about markers, which appear during the drag-and-drop process at the source and target.
