Solved

Drag and Drop- showing image when dragging

Posted on 2001-07-31
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593 Views
Last Modified: 2006-11-17
how do i show a custom image when i am dragging??

heres is a sample of my code
public class CurrentObjectsLabel extends JLabel
    implements DragSourceListener, DragGestureListener    {

  DragSource dragSource = null;
  java.awt.Image image2 = null;
 
  public CurrentObjectsLabel(String name,Icon image,int value) {
    super(name,image,value);
    dragSource = new DragSource();
    dragSource.createDefaultDragGestureRecognizer( this, DnDConstants.ACTION_MOVE, this);
    loadImage();
  }

  public void dragGestureRecognized( DragGestureEvent event) {
       String name = getText();
     System.out.println("Moving oject "+name);
     StringSelection text = new StringSelection(name);
     Point p = new Point(0,0);
        dragSource.startDrag (event,DragSource.DefaultMoveDrop,image2,p,text, this);
  }

 i havent tried using the dragSource.createDefaultDragGestureRecongizer(java.awt.dnd.peer.DragSourceContextPeer dscp, DragGestureEvent dgl, Cursor dragCursor, Image dragImage, Point imageOffset, Transferable t, DragSourceListener dsl)

method because im new to the whole DnD package and wouldnt know where to start for creating a DragSourceContextPeer!!

if anyone can show me some code as to how its done it would be a great help!!
thanks in advance!!

J.B
0
Comment
Question by:j_baxter99
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9 Comments
 
LVL 92

Expert Comment

by:objects
ID: 6337114
If your target environment is Windows then unfortunately I don't think you can.
0
 
LVL 92

Expert Comment

by:objects
ID: 6337130
What your doing looks correct (specifying the image in startDrag) so I'm guessing your on a Windows platform.

The problem is apparently caused by MS.

0
 
LVL 15

Expert Comment

by:ozymandias
ID: 6337333
You just specify an Icon in the startDrag method.
Here is the code :

public void dragGestureRecognized(DragGestureEvent dge){
    ImageIcon icon = new ImageIcon("custom.gif");
    Toolkit tk = this.getToolkit();
    Cursor cursor = tk.createCustomCursor(icon.getImage(), new Point(0,0), "cursor");
    dragSource.startDrag(dge, cursor, ti, this);
}

You just need to specify the image you want to use in :

    ImageIcon icon = new ImageIcon("custom.gif");

instead of "custom.gif

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LVL 15

Expert Comment

by:ozymandias
ID: 6337336
NB : you can use any string instead of "cursor".
The Point is the hotspot of the cursor, i.e. the active bit of the cursor.
0
 
LVL 15

Accepted Solution

by:
ozymandias earned 75 total points
ID: 6337346
Sorry I should have said you specify a cursor, not an icon.

In the startDrag method the DragSource.DefaultMoveDrop object is the cursor that will be used and it is the default drag cursor for the platform. You can replace it with any cursor of your choice.
0
 

Author Comment

by:j_baxter99
ID: 6339514
pretty **** that you cant do it on windows!!!

cheers lads!
0
 
LVL 15

Expert Comment

by:ozymandias
ID: 6339567
You can do it on windows.
The code I posted works fine on windows.
Or at least it works fine on my Windows machine which is NT4.
0
 
LVL 92

Expert Comment

by:objects
ID: 6339589
Cursors work, drag images don't.
0
 

Author Comment

by:j_baxter99
ID: 6343728
sorry , i meant the images on windows!(not cursor)
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