Measuring parentpatcher's "scrolling drift"?

Hello,

In order to test if the mouse is on a given object or not, I have made a little device based on [js].

I cannot use [hover] because the actual objects for which I need this test to take place cannot be expected to have a scripting name…

I have a getsize function in JS such as :

function getsize()

{

var boxPos = this.patcher.box.rect; // [x1, y1, x2, y2]

var winPos = this.patcher.parentpatcher.wind.location; // [x, y, width, height]

var zoom = this.patcher.parentpatcher.getattr("zoomfactor");

var globalX = winPos[0] + (boxPos[0] * zoom) + 35;

var globalY = winPos[1] + (boxPos[1] * zoom) + 35;

var width = (boxPos[2] - boxPos[0]) * zoom;

var height = (boxPos[1] - boxPos[3]) * zoom;

outlet(0, [ globalX, globalX + width, globalY, globalY - height ]);

}

I added +35 empirically, I assume because of the toolbar (I'm not really sure how to handle that otherwise…).Inside the abstraction (which is just a test, I need this detection device in several objects), I compare the coordinates with a mousestate and then I get 0 or 1. Easy.

The tricky part for me was the zoom, it seemed I handled it well with the getattr("zoomfactor") and multiplying the coordinates

But remains for me a BIG issue : how to detect the object when the patching window is being scrolled away from the starting point? In this case, no matter what zoom % I have (even default 100%) the real box position and the mousestate cannot align anymore. As show in this video :

Is there any way to retrieve the parent patcher scrolling drift? I'm not sure how to call that in English…

If you know an idea to detect if toolbar is on/off in parent patcher as well, I'm also interested…

Thanks !