Review Your Application for Possible Drag Sources

Identify the types of data your application might permit as sources for a drag-and-drop transaction. In the example of the bitmap editor, you may want bitmap data containing the current bitmap selection to be a drag source as an accelerator for cut and paste. Once you have identified the data types you will allow to be dragged from your application, determine the widget or widgets that should be drag sources. In the bitmap editor example, you may decide the bitmap editing area containing the highlighted bitmap selection should serve as the drag source. In this case, enable the widget representing this area for sourcing drags.

Start by implementing the drag of buffers that are most appropriate or specific to your application. You will also want to add the ability to drop buffers on your application to enable easy data transfer between multiple invocations of your application.