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package jcgp.gui.dragresize;
import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Region;
import jcgp.gui.GUI;
/**
*
* Decorator pattern.
*
* http://andrewtill.blogspot.co.uk/2012/12/dragging-to-resize-javafx-region.html
*
*/
public class HorizontalDragResize {
private boolean dragging = false;
private final Region region;
private HorizontalDragResize(Region region) {
this.region = region;
}
public static void makeDragResizable(final Region region) {
final HorizontalDragResize dr = new HorizontalDragResize(region);
region.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
dr.mousePressed(event);
}
});
region.setOnMouseDragged(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
dr.mouseDragged(event);
}
});
region.setOnMouseMoved(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
dr.mouseMoved(event);
}
});
region.setOnMouseReleased(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
dr.mouseReleased();
}
});
}
private void mousePressed(MouseEvent event) {
if(isInDraggableZone(event)) {
dragging = true;
}
}
private void mouseDragged(MouseEvent event) {
if(dragging) {
double newWidth = region.getWidth() - event.getX();
if (newWidth >= region.getMinWidth()) {
region.setPrefWidth(newWidth);
} else {
region.setPrefWidth(region.getMinWidth());
}
}
}
private void mouseMoved(MouseEvent event) {
if(isInDraggableZone(event) || dragging) {
region.setCursor(Cursor.H_RESIZE);
}
else {
region.setCursor(Cursor.DEFAULT);
}
}
private void mouseReleased() {
dragging = false;
region.setCursor(Cursor.DEFAULT);
}
private boolean isInDraggableZone(MouseEvent event) {
return event.getX() < (GUI.RESIZE_MARGIN);
}
}
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