Home Page
>
Creating a GUI With JFC/Swing
>
Drag and Drop and Data Transfer
Showing the Drop Location
Generally during a drag operation, a component gives visual feedback
when it can accept the data. It might highlight the drop location,
or it might show a caret or a horizontal line where the
insertion would occur.
Swing renders the drop location when the
canImport
method for the component's
TransferHandler returns true.
To control this programmatically, you can use the
setShowDropLocation method.
Calling this method with true causes the visual feedback
for the drop location to always be displayed, even if the drop will not
be accepted. Calling this method with false prevents any
visual feedback, even if the drop will be accepted.
You always invoke this method from canImport.
The
Demo - LocationSensitiveDemo page includes a combo box that enables you to choose to
always show the drop location, or never show the drop location, or
the default behavior. But first we will talk about
location sensitive drop.
