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DraggingRectangle.java
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DraggingRectangle.java
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package org.genericsystem.cv;
import java.util.Arrays;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
public class DraggingRectangle extends Application {
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage primaryStage) {
Pane root = new Pane();
Rectangle rect = createDraggableRectangle(200, 200, 400, 300);
rect.setFill(Color.NAVY);
root.getChildren().add(rect);
Scene scene = new Scene(root, 800, 800);
primaryStage.setScene(scene);
primaryStage.show();
}
private Rectangle createDraggableRectangle(double x, double y, double width, double height) {
final double handleRadius = 10;
Rectangle rect = new Rectangle(x, y, width, height);
// top left resize handle:
Circle resizeHandleNW = new Circle(handleRadius, Color.GOLD);
// bind to top left corner of Rectangle:
resizeHandleNW.centerXProperty().bind(rect.xProperty());
resizeHandleNW.centerYProperty().bind(rect.yProperty());
// bottom right resize handle:
Circle resizeHandleSE = new Circle(handleRadius, Color.GOLD);
// bind to bottom right corner of Rectangle:
resizeHandleSE.centerXProperty().bind(rect.xProperty().add(rect.widthProperty()));
resizeHandleSE.centerYProperty().bind(rect.yProperty().add(rect.heightProperty()));
// move handle:
Circle moveHandle = new Circle(handleRadius, Color.GOLD);
// bind to bottom center of Rectangle:
moveHandle.centerXProperty().bind(rect.xProperty().add(rect.widthProperty().divide(2)));
moveHandle.centerYProperty().bind(rect.yProperty().add(rect.heightProperty()));
// force circles to live in same parent as rectangle:
rect.parentProperty().addListener((obs, oldParent, newParent) -> {
for (Circle c : Arrays.asList(resizeHandleNW, resizeHandleSE, moveHandle)) {
Pane currentParent = (Pane) c.getParent();
if (currentParent != null) {
currentParent.getChildren().remove(c);
}
((Pane) newParent).getChildren().add(c);
}
});
Wrapper<Point2D> mouseLocation = new Wrapper<>();
setUpDragging(resizeHandleNW, mouseLocation);
setUpDragging(resizeHandleSE, mouseLocation);
setUpDragging(moveHandle, mouseLocation);
resizeHandleNW.setOnMouseDragged(event -> {
if (mouseLocation.value != null) {
double deltaX = event.getSceneX() - mouseLocation.value.getX();
double deltaY = event.getSceneY() - mouseLocation.value.getY();
double newX = rect.getX() + deltaX;
if (newX >= handleRadius && newX <= rect.getX() + rect.getWidth() - handleRadius) {
rect.setX(newX);
rect.setWidth(rect.getWidth() - deltaX);
}
double newY = rect.getY() + deltaY;
if (newY >= handleRadius && newY <= rect.getY() + rect.getHeight() - handleRadius) {
rect.setY(newY);
rect.setHeight(rect.getHeight() - deltaY);
}
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
}
});
resizeHandleSE.setOnMouseDragged(event -> {
if (mouseLocation.value != null) {
double deltaX = event.getSceneX() - mouseLocation.value.getX();
double deltaY = event.getSceneY() - mouseLocation.value.getY();
double newMaxX = rect.getX() + rect.getWidth() + deltaX;
if (newMaxX >= rect.getX()
&& newMaxX <= rect.getParent().getBoundsInLocal().getWidth() - handleRadius) {
rect.setWidth(rect.getWidth() + deltaX);
}
double newMaxY = rect.getY() + rect.getHeight() + deltaY;
if (newMaxY >= rect.getY()
&& newMaxY <= rect.getParent().getBoundsInLocal().getHeight() - handleRadius) {
rect.setHeight(rect.getHeight() + deltaY);
}
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
}
});
moveHandle.setOnMouseDragged(event -> {
if (mouseLocation.value != null) {
double deltaX = event.getSceneX() - mouseLocation.value.getX();
double deltaY = event.getSceneY() - mouseLocation.value.getY();
double newX = rect.getX() + deltaX;
double newMaxX = newX + rect.getWidth();
if (newX >= handleRadius && newMaxX <= rect.getParent().getBoundsInLocal().getWidth() - handleRadius) {
rect.setX(newX);
}
double newY = rect.getY() + deltaY;
double newMaxY = newY + rect.getHeight();
if (newY >= handleRadius && newMaxY <= rect.getParent().getBoundsInLocal().getHeight() - handleRadius) {
rect.setY(newY);
}
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
}
});
return rect;
}
private void setUpDragging(Circle circle, Wrapper<Point2D> mouseLocation) {
circle.setOnDragDetected(event -> {
circle.getParent().setCursor(Cursor.CLOSED_HAND);
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
});
circle.setOnMouseReleased(event -> {
circle.getParent().setCursor(Cursor.DEFAULT);
mouseLocation.value = null;
});
}
static class Wrapper<T> {
T value;
}
}