Node.getBoundsInParent
返回节点在其父级坐标系中的边界。例如,
polygon.getBoundsInParent()
将返回
VBox
中的边界。
如果您需要“向上”移动一步,可以使用
parent.localToParent
。
vBox.localToParent(boundsInVbox)
返回
AnchorPane
坐标系中的边界。
要获取相对于图像大小的值,只需将其除以其大小即可。
以下示例仅允许您将封面区域向一个方向移动,并且不检查区域是否相交,但应足以演示方法。
有趣的部分是按钮的事件处理程序。它将第二个图像的视口限制为未覆盖的第一个图像的部分。
private static void setSideAnchors(Node node) {
AnchorPane.setLeftAnchor(node, 0d);
AnchorPane.setRightAnchor(node, 0d);
}
@Override
public void start(Stage primaryStage) {
Region topRegion = new Region();
topRegion.setStyle("-fx-background-color: white;");
Polygon topArrow = new Polygon(0, 0, 20, 0, 10, 20);
topArrow.setFill(Color.WHITE);
VBox top = new VBox(topRegion, topArrow);
top.setAlignment(Pos.TOP_CENTER);
topArrow.setOnMouseClicked(evt -> {
topRegion.setPrefHeight(topRegion.getPrefHeight() + 10);
});
Region bottomRegion = new Region();
bottomRegion.setStyle("-fx-background-color: white;");
Polygon bottomArrow = new Polygon(0, 20, 20, 20, 10, 0);
bottomArrow.setFill(Color.WHITE);
VBox bottom = new VBox(bottomArrow, bottomRegion);
bottom.setAlignment(Pos.BOTTOM_CENTER);
bottomArrow.setOnMouseClicked(evt -> {
bottomRegion.setPrefHeight(bottomRegion.getPrefHeight() + 10);
});
Image image = new Image("https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg/402px-Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg");
ImageView imageView = new ImageView(image);
setSideAnchors(top);
setSideAnchors(bottom);
setSideAnchors(imageView);
AnchorPane.setTopAnchor(top, 0d);
AnchorPane.setBottomAnchor(bottom, 0d);
AnchorPane.setTopAnchor(imageView, 0d);
AnchorPane.setBottomAnchor(imageView, 0d);
AnchorPane container = new AnchorPane(imageView, top, bottom);
ImageView imageViewRestricted = new ImageView(image);
Button button = new Button("restrict");
button.setOnAction(evt -> {
Bounds topBounds = top.localToParent(topRegion.getBoundsInParent());
Bounds bottomBounds = bottom.localToParent(bottomRegion.getBoundsInParent());
imageViewRestricted.setViewport(new Rectangle2D(
0,
topBounds.getMaxY(),
image.getWidth(),
bottomBounds.getMinY() - topBounds.getMaxY()));
});
HBox root = new HBox(container, button, imageViewRestricted);
root.setFillHeight(false);
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
Node.boundsInParent
? - Slaw