org.webswing.toolkit.WebMouseDragGestureRecognizer Maven / Gradle / Ivy

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package org.webswing.toolkit;

import java.awt.Component;
import java.awt.Point;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSource;
import java.awt.dnd.MouseDragGestureRecognizer;
import java.awt.event.MouseEvent;

import sun.awt.dnd.SunDragSourceContextPeer;

@SuppressWarnings("restriction")
public class WebMouseDragGestureRecognizer extends MouseDragGestureRecognizer {

    private static final long serialVersionUID = 2473988169935151977L;
    protected static int motionThreshold;

    protected WebMouseDragGestureRecognizer(DragSource ds, Component c, int act, DragGestureListener dgl) {
        super(ds, c, act, dgl);
    }

    protected int mapDragOperationFromModifiers(MouseEvent mouseEvent) {
        int i = mouseEvent.getModifiersEx();
        int j = i & 0x1C00;
        if ((j != 1024) && (j != 2048) && (j != 4096)) {
            return 0;
        }
        return SunDragSourceContextPeer.convertModifiersToDropAction(i, getSourceActions());
    }

    public void mousePressed(MouseEvent mouseEvent) {
        this.events.clear();

        if (mapDragOperationFromModifiers(mouseEvent) != 0) {
            try {
                motionThreshold = DragSource.getDragThreshold();
            } catch (Exception localException) {
                motionThreshold = 5;
            }
            appendEvent(mouseEvent);
        }
    }

    public void mouseReleased(MouseEvent mouseEvent) {
        this.events.clear();
    }

    public void mouseEntered(MouseEvent mouseEvent) {
        this.events.clear();
    }

    public void mouseExited(MouseEvent mouseEvent) {
        if (!this.events.isEmpty()) {
            int i = mapDragOperationFromModifiers(mouseEvent);
            if (i == 0) {
                this.events.clear();
            }
        }
    }

    public void mouseDragged(MouseEvent mouseEvent) {
        if (!this.events.isEmpty()) {
            int i = mapDragOperationFromModifiers(mouseEvent);
            if (i == 0) {
                return;
            }
            MouseEvent localMouseEvent = (MouseEvent) this.events.get(0);
            Point localPoint1 = localMouseEvent.getPoint();
            Point localPoint2 = mouseEvent.getPoint();
            int j = Math.abs(localPoint1.x - localPoint2.x);
            int k = Math.abs(localPoint1.y - localPoint2.y);
            if ((j > motionThreshold) || (k > motionThreshold)) {
                fireDragGestureRecognized(i, ((MouseEvent) getTriggerEvent()).getPoint());
            } else {
                appendEvent(mouseEvent);
            }
        }
    }

}