org.piccolo2d.extras.handles.PHandle Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2011, Piccolo2D project, http://piccolo2d.org
* Copyright (c) 1998-2008, University of Maryland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided
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* Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* None of the name of the University of Maryland, the name of the Piccolo2D project, or the names of its
* contributors may be used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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package org.piccolo2d.extras.handles;
import java.awt.Color;
import java.awt.Shape;
import java.awt.event.InputEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import org.piccolo2d.PCamera;
import org.piccolo2d.PNode;
import org.piccolo2d.event.PDragSequenceEventHandler;
import org.piccolo2d.event.PInputEvent;
import org.piccolo2d.event.PInputEventFilter;
import org.piccolo2d.extras.util.PLocator;
import org.piccolo2d.extras.util.PNodeLocator;
import org.piccolo2d.nodes.PPath;
import org.piccolo2d.util.PBounds;
import org.piccolo2d.util.PDimension;
/**
* PHandle is used to modify some aspect of Piccolo when it is dragged.
* Each handle has a PLocator that it uses to automatically position itself. See
* PBoundsHandle for an example of a handle that resizes the bounds of another
* node.
*
* @version 1.0
* @author Jesse Grosjean
*/
public class PHandle extends PPath.Float {
private final class HandleDragHandler extends PDragSequenceEventHandler {
protected void startDrag(final PInputEvent event) {
super.startDrag(event);
startHandleDrag(event.getPositionRelativeTo(PHandle.this), event);
}
protected void drag(final PInputEvent event) {
super.drag(event);
final PDimension aDelta = event.getDeltaRelativeTo(PHandle.this);
if (aDelta.getWidth() != 0 || aDelta.getHeight() != 0) {
dragHandle(aDelta, event);
}
}
protected void endDrag(final PInputEvent event) {
super.endDrag(event);
endHandleDrag(event.getPositionRelativeTo(PHandle.this), event);
}
}
private static final long serialVersionUID = 1L;
/** The default size for a handle. */
public static final float DEFAULT_HANDLE_SIZE = 8;
/** Default shape to use when drawing handles. */
public static final Shape DEFAULT_HANDLE_SHAPE = new Ellipse2D.Float(0f, 0f, DEFAULT_HANDLE_SIZE, DEFAULT_HANDLE_SIZE);
/** Default color to paint handles. */
public static final Color DEFAULT_COLOR = Color.white;
private PLocator locator;
private transient PDragSequenceEventHandler handleDragger;
/**
* Construct a new handle that will use the given locator to locate itself
* on its parent node.
*
* @param aLocator locator to use when laying out the handle
*/
public PHandle(final PLocator aLocator) {
super(DEFAULT_HANDLE_SHAPE);
locator = aLocator;
setPaint(DEFAULT_COLOR);
installHandleEventHandlers();
}
/**
* Installs the handler that notify its subclasses of handle interaction.
*/
protected void installHandleEventHandlers() {
handleDragger = new HandleDragHandler();
addPropertyChangeListener(PNode.PROPERTY_TRANSFORM, new PropertyChangeListener() {
public void propertyChange(final PropertyChangeEvent evt) {
relocateHandle();
}
});
handleDragger.setEventFilter(new PInputEventFilter(InputEvent.BUTTON1_MASK));
handleDragger.getEventFilter().setMarksAcceptedEventsAsHandled(true);
handleDragger.getEventFilter().setAcceptsMouseEntered(false);
handleDragger.getEventFilter().setAcceptsMouseExited(false);
// no need for moved events for handle interaction,
handleDragger.getEventFilter().setAcceptsMouseMoved(false);
// so reject them so we don't consume them
addInputEventListener(handleDragger);
}
/**
* Return the event handler that is responsible for the drag handle
* interaction.
*
* @return current handler for HandleDrag events
*/
public PDragSequenceEventHandler getHandleDraggerHandler() {
return handleDragger;
}
/**
* Get the locator that this handle uses to position itself on its parent
* node.
*
* @return the locator associated with this handle
*/
public PLocator getLocator() {
return locator;
}
/**
* Set the locator that this handle uses to position itself on its parent
* node.
*
* @param locator the locator to assign to this handle
*/
public void setLocator(final PLocator locator) {
this.locator = locator;
invalidatePaint();
relocateHandle();
}
/**
* Override this method to get notified when the handle starts to get
* dragged.
*
* @param aLocalPoint point on the handle at which the event occurred
* @param aEvent the event responsible for starting the dragging
*/
public void startHandleDrag(final Point2D aLocalPoint, final PInputEvent aEvent) {
}
/**
* Override this method to get notified as the handle is dragged.
*
* @param aLocalDimension size of the drag in handle coordinates
* @param aEvent event representing the drag
*/
public void dragHandle(final PDimension aLocalDimension, final PInputEvent aEvent) {
}
/**
* Override this method to get notified when the handle stops getting
* dragged.
*
* @param aLocalPoint point in handle coordinate system of the end of the
* drag
* @param aEvent event responsible for ending the drag
*/
public void endHandleDrag(final Point2D aLocalPoint, final PInputEvent aEvent) {
}
/**
* Set's this handle's parent. Handles respond to changes in their parent's
* bounds by invalidating themselves.
*
* @param newParent the new parent to assign to this handle
*/
public void setParent(final PNode newParent) {
super.setParent(newParent);
relocateHandle();
}
/**
* Forces the handles to reposition themselves using their associated
* locator.
*/
public void parentBoundsChanged() {
relocateHandle();
}
/**
* Force this handle to relocate itself using its locator.
*/
public void relocateHandle() {
if (locator == null) {
return;
}
final PBounds b = getBoundsReference();
final Point2D aPoint = locator.locatePoint(null);
if (locator instanceof PNodeLocator) {
final PNode located = ((PNodeLocator) locator).getNode();
final PNode parent = getParent();
located.localToGlobal(aPoint);
globalToLocal(aPoint);
if (parent != located && parent instanceof PCamera) {
((PCamera) parent).viewToLocal(aPoint);
}
}
final double newCenterX = aPoint.getX();
final double newCenterY = aPoint.getY();
if (newCenterX != b.getCenterX() || newCenterY != b.getCenterY()) {
centerBoundsOnPoint(newCenterX, newCenterY);
}
}
/**
* Deserializes a PHandle from the input stream provided. Ensures tha all
* event handles are correctly installed.
*
* @param in stream from which to read the handle
* @throws IOException is thrown if the underlying input stream fails
* @throws ClassNotFoundException should never happen but can happen if the
* classpath gets messed up
*/
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
installHandleEventHandlers();
}
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