Package panamagl.canvas

Class PixelScaleSupportJFX

java.lang.Object

panamagl.canvas.PixelScaleSupportJFX

public class PixelScaleSupportJFX
extends Object

HiDPI plumbing for GLCanvasJFX.

Reads the current pixel scale from Window.getRenderScaleX() / Window.getRenderScaleY() (the actual scale used by Prism — typically equal to the screen output scale, but possibly capped by the JVM property prism.allowhidpi).

Falls back to Screen.getOutputScaleX() / Screen.getOutputScaleY() when the canvas is not yet attached to a window — for example during construction.

Listeners are wired in cascade so that the scale-change events keep firing even when the canvas is reparented to a different scene or stage: canvas.sceneProperty -> scene.windowProperty -> window.renderScaleX/Y.

Unlike the AWT support, no polling is needed: JavaFX publishes a property change every time the render scale changes (e.g. monitor switch, OS scaling change).

Constructor Summary

Constructors

Constructor	Description
PixelScaleSupportJFX(javafx.scene.canvas.Canvas canvas)

Method Summary

Modifier and Type	Method	Description
void	addListener(panamagl.canvas.PixelScaleListener l)
panamagl.canvas.PixelScale	current()	Last value reported to listeners.
panamagl.canvas.PixelScale	read()	Read the current pixel scale, walking the canvas->scene->window chain when possible.
void	removeListener(panamagl.canvas.PixelScaleListener l)
void	start()	Wire the listener cascade.
void	stop()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PixelScaleSupportJFX

public PixelScaleSupportJFX(javafx.scene.canvas.Canvas canvas)

Method Details

read

public panamagl.canvas.PixelScale read()

Read the current pixel scale, walking the canvas->scene->window chain when possible.

current

public panamagl.canvas.PixelScale current()

Last value reported to listeners.

start

public void start()

Wire the listener cascade. Idempotent. Must be called from the JavaFX application thread — which is where GLCanvasJFX constructs its support.

stop

public void stop()

addListener

public void addListener(panamagl.canvas.PixelScaleListener l)

removeListener

public void removeListener(panamagl.canvas.PixelScaleListener l)