Allow user to resize an undecorated Stage

Question

I am working on making a screen recorder in JavaFX and one utility that is mandatory in the screen recorder is to let the user define how much area to record.

I m

Answer 1

I've looked into some threads where they discuss about it before I tried myself to "solve" it, but in the end there was no Problem.

I created a button in the bottom-right corner, gave the Button an OnDraggedMethod and simply used the mouseevent and set the Height/Width on MousePosition - stage X/Y position.

    double newX = event.getScreenX() - stage.getX() + 13;
    double newY = event.getScreenY() - stage.getY() + 10;
    if (newX % 5 == 0 || newY % 5 == 0) {
        if (newX > 550) {
            stage.setWidth(newX);
        } else {
            stage.setWidth(550);
        }

        if (newY > 200) {
            stage.setHeight(newY);
        } else {
            stage.setHeight(200);
        }
    }

Also I set a minimal Width and Height. And because i think that the laggy resize-animation is annoying i surrounded the statement with the if and just resize the stage every 5th pixel.

Looks much better!

PS: The +13 and +10 is just for the MousePosition. Otherweise the Mouse is on the Corner not on the Button^^.