How to Automatically Resize a Canvas to Fill Its Parent Stage in JavaFX?

Resizing Canvas to Fill Enclosing Parent in JavaFX

The query revolves around automatically resizing a Canvas element to fit its enclosing parent Stage in JavaFX. The key to achieving this is through binding and creating a custom Pane that wraps the Canvas.

Creating a CanvasPane

To create a resizable Canvas, we define a static nested class, CanvasPane, which extends Pane and overrides the layoutChildren() method. By overriding this method, we can force the Canvas dimensions to match its enclosing Pane. Note that Canvas by itself cannot be resized, and the parent cannot resize it automatically.

Here's the layoutChildren() method for CanvasPane:

<code class="java">@Override
protected void layoutChildren() {
    super.layoutChildren();
    final double x = snappedLeftInset();
    final double y = snappedTopInset();
    final double w = snapSize(getWidth()) - x - snappedRightInset();
    final double h = snapSize(getHeight()) - y - snappedBottomInset();
    canvas.setLayoutX(x);
    canvas.setLayoutY(y);
    canvas.setWidth(w);
    canvas.setHeight(h);
}</code>

Using CanvasPane

In our main Application class, we wrap our Canvas in a CanvasPane:

<code class="java">CanvasPane canvasPane = new CanvasPane(WIDTH, HEIGHT);
canvas = canvasPane.getCanvas();</code>

With CanvasPane, the Canvas will automatically resize to fill the enclosing Stage.

Additional Considerations

The accepted answer in the referenced Stack Overflow question lacks the binding illustrated here. This approach provides a more seamless integration between the Canvas and its parent layout.

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