Example usage for javafx.scene.input ScrollEvent getDeltaY

Introduction

In this page you can find the example usage for javafx.scene.input ScrollEvent getDeltaY.

Prototype

public double getDeltaY() 

Source Link

Document

Gets the vertical scroll amount.

Usage

From source file:uk.bl.dpt.qa.gui.DissimilarGUIThread.java

@FXML
void mouseScroll(ScrollEvent event) {

    event.consume();/*from  w w  w  . j  av a 2 s . c om*/
    final double diff = 0.1;

    //scroll pane locations
    final double h = scrollPaneLeft.getHvalue();
    final double v = scrollPaneLeft.getVvalue();

    final double min = 400;

    if (event.getDeltaY() > 0 && ((imageLeft.getBoundsInParent().getWidth() < min)
            || imageLeft.getBoundsInParent().getHeight() < min)) {
        return;
    }

    if (event.getDeltaY() < 0) {
        imageLeft.setScaleX(imageLeft.getScaleX() + diff);
        imageLeft.setScaleY(imageLeft.getScaleY() + diff);
    } else {
        imageLeft.setScaleX(imageLeft.getScaleX() - diff);
        imageLeft.setScaleY(imageLeft.getScaleY() - diff);
    }
    imageRight.setScaleX(imageLeft.getScaleX());
    imageRight.setScaleY(imageLeft.getScaleY());

    //just set the same ratio of scroll - this should work out mostly ok
    scrollPaneLeft.setHvalue(h);
    scrollPaneLeft.setVvalue(v);

}

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