How to make canvas Resizable in javaFX?

Question

In javaFX to resize a canvas there is no such method to do that, the only solution is to extends from Canvas.

class ResizableCanvas extends Canvas {

    pub         


        

Answer 1

this solution work only if we don't want to use FXML

I am not sure about the merits of a resizable canvas itself, neither with/without FXML. Generally you want to redraw something on it, and then you do not have a canvas (which has no content on its own), but you are back to application-specific code, just as like the question iself and most answers around do contain some re/draw() method.
Then you could throw away the separate class, do four bindings in FXML:

and implement only redraw() in Java:

package test;

import javafx.fxml.FXML;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;

public class TestController {
  @FXML
  private Canvas canvas;

  @FXML
  private void redraw() {
    double w=canvas.getWidth();
    double h=canvas.getHeight();
    GraphicsContext gc=canvas.getGraphicsContext2D();
    gc.clearRect(0, 0, w, h);
    gc.beginPath();
    gc.rect(10, 10, w-20, h-20);
    gc.stroke();
  }
}

(If needed, find a suitable main class and module-info in https://stackoverflow.com/a/58915071/7916438)