How to Choose the Drop Action?

[- Empty Shell -]

Hi friends,
I have started recently with the Java. In that i have started the Drop Action and the methods related to it.!! But I am confused in choosing that.!! So anyone can explain me how to Choose the Drop Action.?? hope that you got my point.!! Please help me soon..

[void]

The set of actions are advertised when exporting data. The source actions are advertised through the getSourceActions method, for Swing components. A method to query the actual drop action that TransferHandler will use. A method to query the source's drop actions, so you know which actions are supported. A way to explicitly choose the actual drop action.

[Warner]

The TransferHandler for the copy-only target can be coded to only accept data from the source using the setDropAction method, even if the user has indicated a preference for a move action. When a drag is initiated, the user has some control over which of the source actions is chosen for the transfer by way of keyboard modifiers used in conjunction with the drag gesture which is called as user action. The user action indicates a preference, but ultimately it is the target that decides the drop action.

[opaper]

Just have a look at the following code which may help you a lot :

public boolean canImport(TransferHandler.TransferSupport support) {
    if (!support.isDrop()) {
        return false;
    }

    if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {
        return false;
    }

    boolean copySupported = (COPY & support.getSourceDropActions()) == COPY;
    if (copySupported) {
        support.setDropAction(COPY);
        return true;
    }

    return false;
}

[Praetor]

If you are writing the proper code, the setDropAction method is invoked to ensure that only a copy action will take place and the method returns true. The FromTransferHandler, attached to the source list, allows for dragging from the list and supports both copy and move actions. If you try to drop onto this list, the drop will be rejected because FromTransferHandler has not implemented the canImport and importData methods.