JavaFX2: Drag Event start and end coordinates
- by user
I have one node(ImageView) that displays an image and another node(rectangle) that resides on top of it. The behavior I need is that when the mouse is dragged(press-drag-release gesture) over the rectangle, both the nodes should move coherently. My thought process goes in the following direction:
• Move both the nodes by the same distance in the direction of the drag.
For this option(maybe there are more options) I need the distance between the start and end of the mouse drags. I tried capturing the start and end coordinates of the drag but have been unsuccessful. I think I am getting lost in which handlers to implement.
The code I have is below:
import javafx.event.EventHandler;
import javafx.geometry.Rectangle2D;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
public class MyView
{
double mouseDragStartX;
double mouseDragEndX;
double mouseDragStartY;
double mouseDragEndY;
ImageView imageView;
public MyView()
{
imageView = new ImageView("C:\\temp\\test.png");
}
private void setRectangleEvents(final MyObject myObject)
{
myObject.getRectangle().setOnMousePressed(new EventHandler<MouseEvent>()
{
@Override
public void handle(MouseEvent mouseEvent)
{
mouseDragStartX = mouseEvent.getX();
mouseDragStartY = mouseEvent.getY();
mouseEvent.consume();
}
});
myObject.getRectangle().setOnMouseReleased(new EventHandler<MouseEvent>()
{
public void handle(MouseEvent mouseEvent)
{
mouseDragEndX = mouseEvent.getX();
mouseDragEndY = mouseEvent.getY();
myObjectDraggedHandler();
}
});
}
private void myObjectDraggedHandler()
{
Rectangle2D viewport = this.imageView.getViewport();
double newX = this.imageView.getImage().getWidth()
+ (mouseDragEndX - mouseDragStartX);
double newY = this.imageView.getImage().getHeight()
+ (mouseDragEndY - mouseDragStartY);
this.imageView.setViewport(new Rectangle2D(newX, newY, viewport.getWidth(), viewport
.getHeight()));
}
}
P.S: This code is just for indicating what I am trying to implement and will not compile correctly.
Or maybe my question should just have been:
How to capture the length or span of a mouse drag?
