JavaFX get drag && drop target folder after drop has been done

问题

Question on Java Oracle Community (https://community.oracle.com/thread/3934986)

The Problem:

I have set the code below for a Button which it's full name represents a file path.So when the Button is dragged to a folder or desktop(let's say in Windows😛) it is copied by user's Operating System.

I want to get the target folder on which the drop has been done.

Code:

button.setOnDragDetected(event -> {

        /* allow copy transfer mode */
        Dragboard db =  startDragAndDrop(TransferMode.COPY,TransferMode.LINK);

        /* put a string on dragboard */
        ClipboardContent content = new ClipboardContent();

        /*Adding a file into the ClipboardContent*/
        content.putFiles(Arrays.asList(new File(getSongPath())));

        ........//not showing this code....

        db.setContent(content);

        event.consume();

    }

Edit:(29/09/2016)

When the drop is done:

setOnDragDone(d -> {
                System.out.println(
                        "Drag Done,is drop completed?" + d.isDropCompleted() + " , is accepted?" + d.isAccepted());
                System.out.println("Accepted Mode:" + d.getAcceptedTransferMode());
                System.out.println(" Target:" + d.getTarget() + " Gestoure Target:" + d.getGestureTarget());
            });

I get this output where you can see that the Gesture Target == null

Drag Done:true , s drop completed?false , is accepted?true
Accepted Mode:COPY
Target:SmartController$TableViewer@112437[styleClass=table-view] Gesture Target:null

回答1:

I did some research and it is probably not possible. For example this thread: Get file path for drag-n-drop file on Windows Explorer

You may try this workaround:

in the setOnDragDetected() make a copy of the file you would like to drop and put this copied file path in the content.putFile
change TransferMode.COPY to TransferMode.MOVE
start monitoring the copied file to detect where it was moved - now this is the tricky part. Some of these libraries may help: Java: File Renaming Detection

This is just an idea for workaround (I didn't fully test it but worth checking)

EDIT 1: Worth reading. How folder detection can be done on Windows:

http://www.codeproject.com/Articles/23207/Drag-and-Drop-to-Windows-Folder-C

来源：https://stackoverflow.com/questions/37237837/javafx-get-drag-drop-target-folder-after-drop-has-been-done

标签

java

javafx

drag-and-drop