The drag source and drop target play different roles. An application can have UI components that are only drag sources, only drop targets or both, such as the sample Photo Booth application shown in Figure 1. Figure 1 Drag Sources and Drop Targets. A drag-and-drop operation is driven entirely by user input, so its implementation is almost exclusively event-based, as shown in Figure 2. Figure 2 Drag and Drop Events. Implementing a Drag Source In Windows 8.
The application can handle the DragItemsStarting event on the source. The main drag source for modern drag and drop is the UIElement, which gives access to all modern drag-and-drop features and is the main focus of this article.
This can be done in the markup or in the codebehind. The XAML framework handles gesture recognition and fires the DragStarting event to indicate the start of a drag operation. The application must configure the DataPackage by filling its content and indicating which operations are supported. The source application can put different formats in the DataPackage, which will make it compatible with more targets, as shown in Figure 3.
The supported operations are defined in the DataPackageOperation type and can be Copy, Move, Link or any combination of these. You can cancel the Drag operation in the event handler by setting the Cancel property of the DragStartingEventArgs parameter; for example, in our sample application, an image placeholder will start a Drag operation only if it has received an image or a file.
The DragStartingEvent handler is also the place where the source application can customize the drag UI, which is explained later in this article. In some cases, the application might want to use a special gesture to start a drag-and-drop operation, or want to allow dragging a control whose normal interactions interfere with the drag-and-drop gesture, for example, the TextBox, which already reacts to pointer-down events by changing its selection.
In these cases, the application can implement its own gesture detection and then initiate a drag-and-drop operation by calling the StartDragAsync method. Once the user has released the pointer, the drag-and-drop operation is complete and the source is notified through the DropCompleted event, which contains the DataPackageOperation returned by the target on which the user released the pointer, or DataPackageOperation. Programmatically canceling after the DragStarting event is possible through the IAsyncOperation interface, but might be disturbing for the user.
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