ZoomLayout | 2D zoom and pan behavior for View hierarchies, images, video streams, and much more, written in Kotl | Android library

So I'm not the library's true user that I don't know actual answer. But I myself do similar thing as the library in my custom ImageView. So I can suggest somewhat. Please try and examine later by yourself.

The library has those Pan APIs. I think by using either getPan()/getPanX()/getPanY() or getScaledPan()/getScaledPanX()/getScaledPanY() you can get the left-top point's coordinates. (Maybe, the latter scaled ones are what you want?)

Once you get the left-top point's coordinates, you can calculate the others by the rectangle's width and height.

To know width and height, you can reverse-calculate from your ImageView's width and height, and current scale factor.

To know the width and height of your ImageView, use getWidth() and getHeight().

To know the current scale factor of the library, either getZoom() or getRealZoom() of Zoom APIs should be usable.

Then, divide ImageView's width or height by the current scale factor and you get the rectangle's width or height.

At last, based on the left-top point's coordinates, left-bottom point is plus height, right-top point is plus width and right-bottom point is plus width and height.

Sample Code

layout/activity_main.xml:

This is called delegation, specifically it is a type of delegation known as implementation by delegation.

By doing this, the class C implements the interface using the other object.

i.e. when you call the method (function) defined in the interface then the call is going to get transferred to the object you delegated in your case it is the field