这是一个 可扩展的，可缩放的 JavaFX ScrollPane：
import javafx.geometry.Bounds;import javafx.geometry.Point2D;import javafx.geometry.Pos;import javafx.scene.Group;import javafx.scene.Node;import javafx.scene.control.ScrollPane;import javafx.scene.layout.VBox;public class ZoomableScrollPane extends ScrollPane { private double scalevalue = 0.7; private double zoomIntensity = 0.02; private Node target; private Node zoomNode; public ZoomableScrollPane(Node target) { super(); this.target = target; this.zoomNode = new Group(target); setContent(outerNode(zoomNode)); setPannable(true); setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER); setVbarPolicy(ScrollPane.ScrollBarPolicy.NEVER); setFitToHeight(true); //center setFitToWidth(true); //center updateScale(); } private Node outerNode(Node node) { Node outerNode = centeredNode(node); outerNode.setonScroll(e -> { e.consume(); onScroll(e.getTextDeltaY(), new Point2D(e.getX(), e.getY())); }); return outerNode; } private Node centeredNode(Node node) { VBox vBox = new VBox(node); vBox.setAlignment(Pos.CENTER); return vBox; } private void updateScale() { target.setScaleX(scalevalue); target.setScaleY(scalevalue); } private void onScroll(double wheelDelta, Point2D mousePoint) { double zoomFactor = Math.exp(wheelDelta * zoomIntensity); Bounds innerBounds = zoomNode.getLayoutBounds(); Bounds viewportBounds = getViewportBounds(); // calculate pixel offsets from [0, 1] range double valX = this.getHvalue() * (innerBounds.getWidth() - viewportBounds.getWidth()); double valY = this.getVvalue() * (innerBounds.getHeight() - viewportBounds.getHeight()); scalevalue = scalevalue * zoomFactor; updateScale(); this.layout(); // refresh ScrollPane scroll positions & target bounds // convert target coordinates to zoomTarget coordinates Point2D posInZoomTarget = target.parentToLocal(zoomNode.parentToLocal(mousePoint)); // calculate adjustment of scroll position (pixels) Point2D adjustment = target.getLocalToParentTransform().deltaTransform(posInZoomTarget.multiply(zoomFactor - 1)); // convert back to [0, 1] range // (too large/small values are automatically corrected by ScrollPane) Bounds updatedInnerBounds = zoomNode.getBoundsInLocal(); this.setHvalue((valX + adjustment.getX()) / (updatedInnerBounds.getWidth() - viewportBounds.getWidth())); this.setVvalue((valY + adjustment.getY()) / (updatedInnerBounds.getHeight() - viewportBounds.getHeight())); }}
