How to segment tools based on key modifiers

GoJS
1

I’m looking at the DragZooming sample and see that it overrides the DragSelecting Tool.

However, I want both tools to be available. DragSelecting should be started after a long press and drag, but DragZooming should be started after a long press and drag while holding Control.

What is the suggested way to manage this?

Thanks!

2

Just modify the DragZoomingTool.canStart method to only return true if the control key is held down:

DragZoomingTool.prototype.canStart = function() {
  . . .
  // require left button & control button & that it has moved far enough away from the mouse down point, so it isn't a click
  if (!e.left || !e.control) return false;
  . . .

Or if you don’t want to modify extensions/DragZooming.js, override the method just in your app.

3

Perfect, thanks!