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Re: OutOfMemoryException During Drag and Drop From a Tree

on 27/11/02 11:28 PM, Shankman, Gordon L. at email@hidden
wrote:

> I am running into a problem when trying to do drag and drop from a
> large JTree (about 3000 leaves). The default behavior under Mac OS X
> 10.2 seems to be to create a translucent image of the entire tree
> during the drag operation and display that image during the drag. I
> have the JTree displayed in a JScrollPane but the created image is the
> entire tree, not just the visible portion. The creation of this image
> causes an OutOfMemoryException that prevents the drag operation from
> beginning. Is there a non-Mac specific way to stop this image from
> being created or to force it to only display the visible portion of the
> tree? I have to be able to compile and run the code on other systems
> as well (Linux and Windows) so I can't do anything specific to OS X.
>
> Thanks to anyone who can help,
> Gordon Shankman
>snip<

I've had this problem. I think I previously did something like the following
in my dragGestureRecognized method.

Rectangle bounds =getPathBounds(path);
Component renderer = getCellRenderer().getTreeCellRendererComponent(
this,item,true,false,item.isLeaf(),
this.getRowForPath(path),true);
renderer.setSize(bounds.width,bounds.height);
Image image = createImage(bounds.width,bounds.height);
Graphics g = image.getGraphics();
renderer.paint(g);
g.dispose();

int act = dge.getDragAction();
switch(act){
case DnDConstants.ACTION_COPY:
dge.startDrag(DragSource.DefaultCopyNoDrop,image,...


Hope it helps.

cheers

Brooklyn Waters
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References: 
 >OutOfMemoryException During Drag and Drop From a Tree (From: "Shankman, Gordon L." <email@hidden>)



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