Re: DnD JTree

• Subject: Re: DnD JTree
• From: Alexander Lohse <email@hidden>
• Date: Wed, 9 Jul 2003 11:32:59 +0200

And how would I do that?

A tree node is eventually a Jlabel....

TreeCellRenderer tcr = tree.getCellRenderer();
JLabel dragLabel = (JLabel)tcr.getTreeCellRendererComponent(tree,
node, true, true, node.isLeaf(), selRow, true);

Image dragImage = DragImage.createDragImage(dragLabel);




Use this static method, albeit quite chopped up from the e-mail...



public static Image createDragImage(JLabel label) {

Dimension d = label.getSize();


BufferedImage ghostImage = new BufferedImage(d.width, d.height,
BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g2 = ghostImage.createGraphics();

// Ask the cell renderer to paint itself into the BufferedImage

g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.5f));

label.paint(g2);

// Now paint a gradient UNDER the ghosted JLabel text (but not under
// the icon if any)
// Note: this will need tweaking if your icon is not positioned to
// the left of the text

Icon icon = label.getIcon();
int nStartOfText = (icon == null) ? 0 : icon.getIconWidth() +
label.getIconTextGap();

g2.setComposite(AlphaComposite.getInstance(AlphaComposite.DST_OVER,
0.5f));

g2.setPaint(new GradientPaint(nStartOfText, 0,
SystemColor.controlShadow, ghostImage.getWidth(),
0, new Color(255,255,255,0)));

g2.fillRect(nStartOfText, 0, ghostImage.getWidth(),
ghostImage.getHeight());

g2.dispose();


return ghostImage;

}

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