Change shape of middle handles

JGo
1


I create a ‘lane’ object using JGoSubGraph. It is resizable. I want to show only TopMiddle handle and BottomMiddle handle, so that only lane’s height is resizable. I also want to make the handles nearly as wide as the lane itself, so that the user could resize it anywhere along its length. How to get this behavior? thanks,

2

Just override JGoObject.gainedSelection with a variation of what JGoSubGraph does:
protected void gainedSelection(JGoSelection selection) {
if (!isResizable() || !isExpanded()) {
selection.createBoundingHandle(this);
return;
}
Rectangle rect = computeBorder();
int x1 = rect.x;
int x2 = rect.x + (rect.width/2);
int x3 = rect.x + rect.width;
int y1 = rect.y;
int y2 = rect.y + (rect.height/2);
int y3 = rect.y + rect.height;
JGoHandle goh = selection.createResizeHandle(this, x1,y1, TopMiddle, true);
goh.setWidth(rect.width);
goh = selection.createResizeHandle(this, x1,y3, BottomMiddle, true);
goh.setWidth(rect.width);
}
Note that the resize handles will let the user change the margins. It does not change the result of JGoSubGraph.computeInsideMargins, which is the region that is inside the margins.

3

that works! thanks for the quick response.

4

The middle handles work well, but the TopLeft, TopRight, BottomLeft, BottomRight still show. How can I hide them?

5

??? But gainedSelection doesn’t call the base method, assuming your subgraph is resizable. You’ll need to set a break point in createResizeHandle and figure out why it’s being called outside of your override of JGoObject.gainedSelection.

6

my mistake, it is fixed now. thanks