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package org.netbeans.modules.visual.action;
import org.netbeans.api.visual.action.ConnectDecorator;
import org.netbeans.api.visual.action.ConnectProvider;
import org.netbeans.api.visual.action.WidgetAction;
import org.netbeans.api.visual.action.ConnectorState;
import org.netbeans.api.visual.anchor.Anchor;
import org.netbeans.api.visual.widget.ConnectionWidget;
import org.netbeans.api.visual.widget.Scene;
import org.netbeans.api.visual.widget.Widget;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.KeyEvent;
/**
* Override at least isTargetWidget and createConnection methods. isSourceWidget is always called before isTargetWidget.
*
* @author David Kaspar
*/
public class ConnectAction extends WidgetAction.LockedAdapter {
private static final int MIN_DIFFERENCE = 5;
private ConnectDecorator decorator;
private Widget interractionLayer;
private ConnectProvider provider;
private ConnectionWidget connectionWidget = null;
private Widget sourceWidget = null;
private Widget targetWidget = null;
private Point startingPoint = null;
public ConnectAction (ConnectDecorator decorator, Widget interractionLayer, ConnectProvider provider) {
this.decorator = decorator;
this.interractionLayer = interractionLayer;
this.provider = provider;
}
protected boolean isLocked () {
return sourceWidget != null;
}
public WidgetAction.State mousePressed (Widget widget, WidgetAction.WidgetMouseEvent event) {
if (isLocked ())
return WidgetAction.State.createLocked (widget, this);
return mousePressedCore (widget, event);
}
protected State mousePressedCore (Widget widget, WidgetMouseEvent event) {
if (event.getButton () == MouseEvent.BUTTON1 && event.getClickCount () == 1) {
if (provider.isSourceWidget (widget)) {
sourceWidget = widget;
targetWidget = null;
startingPoint = new Point (event.getPoint ());
connectionWidget = decorator.createConnectionWidget (interractionLayer.getScene ());
assert connectionWidget != null;
connectionWidget.setSourceAnchor (decorator.createSourceAnchor (widget));
interractionLayer.addChild (connectionWidget);
return State.createLocked (widget, this);
}
}
return State.REJECTED;
}
public WidgetAction.State mouseReleased (Widget widget, WidgetAction.WidgetMouseEvent event) {
Point point = event.getPoint ();
boolean state = move (widget, point);
if (state) {
if (targetWidget != null)
if (Math.abs (startingPoint.x - point.x) >= MIN_DIFFERENCE || Math.abs (startingPoint.y - point.y) >= MIN_DIFFERENCE)
provider.createConnection (sourceWidget, targetWidget);
cancel ();
}
return state ? State.CONSUMED : State.REJECTED;
}
private void cancel () {
sourceWidget = null;
targetWidget = null;
startingPoint = null;
connectionWidget.setSourceAnchor (null);
connectionWidget.setTargetAnchor (null);
interractionLayer.removeChild (connectionWidget);
connectionWidget = null;
}
public WidgetAction.State mouseDragged (Widget widget, WidgetAction.WidgetMouseEvent event) {
return move (widget, event.getPoint ()) ? State.createLocked (widget, this) : State.REJECTED;
}
private boolean move (Widget widget, Point point) {
if (sourceWidget != widget)
return false;
Point targetSceneLocation = widget.convertLocalToScene (point);
targetWidget = resolveTargetWidgetCore (interractionLayer.getScene (), targetSceneLocation);
Anchor targetAnchor = null;
if (targetWidget != null)
targetAnchor = decorator.createTargetAnchor (targetWidget);
if (targetAnchor == null)
targetAnchor = decorator.createFloatAnchor (targetSceneLocation);
connectionWidget.setTargetAnchor (targetAnchor);
return true;
}
private Widget resolveTargetWidgetCore (Scene scene, Point sceneLocation) {
if (provider != null)
if (provider.hasCustomTargetWidgetResolver (scene))
return provider.resolveTargetWidget (scene, sceneLocation);
Point sceneOrigin = scene.getLocation ();
sceneLocation = new Point (sceneLocation.x + sceneOrigin.x, sceneLocation.y + sceneOrigin.y);
Widget[] result = new Widget[]{null};
resolveTargetWidgetCoreDive (result, scene, sceneLocation);
return result[0];
}
private boolean resolveTargetWidgetCoreDive (Widget[] result, Widget widget, Point parentLocation) {
if (interractionLayer.equals (widget))
return false;
Point widgetLocation = widget.getLocation ();
Point location = new Point (parentLocation.x - widgetLocation.x, parentLocation.y - widgetLocation.y);
if (! widget.getBounds ().contains (location))
return false;
java.util.List children = widget.getChildren ();
for (int i = children.size () - 1; i >= 0; i --) {
if (resolveTargetWidgetCoreDive (result, children.get (i), location))
return true;
}
if (! widget.isHitAt (location))
return false;
ConnectorState state = provider.isTargetWidget (sourceWidget, widget);
if (state == ConnectorState.REJECT)
return false;
if (state == ConnectorState.ACCEPT)
result[0] = widget;
return true;
}
public State keyPressed (Widget widget, WidgetKeyEvent event) {
if (isLocked () && event.getKeyCode () == KeyEvent.VK_ESCAPE) {
cancel ();
return State.CONSUMED;
}
return super.keyPressed (widget, event);
}
}