[gef-dev] Ghost shape, Mac OS X xor issue, and a possible solution

[Jens v.P. <developer@xxxxxxxxx>]

Hi,

I've already posted an article on the newsgroup, but probably this  
was the wrong place.

I'm running Eclipse with Mac OS X. There is an issue with the XOR  
mode, which is not (and will never) be supported by Mac OS X (i.e.  
Quarz). This is already documented in the SWT bugzilla and SWT's xor- 
methods are all deprecated. Thus, IMHO GEF's xor methods should be  
deprecated, too.

I've implemented a possible solution:

1) Add a new property "alpha" to Shape: int alpha, with appropriate  
setter and getter, propagate alpha setting to graphics in Shape.paint 
(), this must be done before fillShape() and outlineShape() is called:
	if (alpha!=255) {
		graphics.setAlpha(alpha);
	}


2) Change FigureUtilities.makeGhostShape(..):
public static Shape makeGhostShape(Shape s) {
	s.setBackgroundColor(ghostFillColor);
	//s.setFillXOR(true);
	//s.setOutlineXOR(true);
	s.setAlpha(100); // or s.setAlpha(ghostAlpha)
	return s;
}

This is working fine. Maybe it would be nice to make the  
ghostFillColor (and maybe a ghostAlpha) mutable? Using alpha,
	ghostFillColor = ColorConstants.blue;
looks very nice ;)

Shape.setXORMode() and all other draw2d.*.setXORMode() should be  
marked deprecated.

Jens