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Open Source Chemistry Library
/*
* Copyright (c) 1997 - 2016
* Actelion Pharmaceuticals Ltd.
* Gewerbestrasse 16
* CH-4123 Allschwil, Switzerland
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the the copyright holder nor 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 PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package com.actelion.research.gui.dnd;
import com.actelion.research.chem.AbstractDepictor;
import com.actelion.research.chem.Depictor2D;
import com.actelion.research.chem.StereoMolecule;
import com.actelion.research.chem.dnd.ChemistryFlavors;
import com.actelion.research.gui.generic.GenericRectangle;
import java.awt.*;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
public abstract class MoleculeDragAdapter implements DragSourceListener//,DragSourceMotionListener
{
int mAllowedDragAction;
Cursor cursor = null;
public MoleculeDragAdapter(Component c)
{
// DragSource ds = new DragSource();
// ds.addDragSourceListener(new WindowMovingDragSourceListener());
DragSource.getDefaultDragSource().createDefaultDragGestureRecognizer(
c, DnDConstants.ACTION_COPY_OR_MOVE, new DGListener());
mAllowedDragAction = DnDConstants.ACTION_COPY_OR_MOVE;
}
public void allowDrag(boolean allow)
{
if (allow)
mAllowedDragAction = DnDConstants.ACTION_COPY_OR_MOVE;
else
mAllowedDragAction = DnDConstants.ACTION_NONE;
}
public abstract Transferable getTransferable(Point origin);
public void onDragEnter()
{
}
public void onDragOver()
{
}
public void onDragExit()
{
}
public void dragDropEnd(DragSourceDropEvent e)
{
}
public final void dragEnter(DragSourceDragEvent e)
{
DragSourceContext context = e.getDragSourceContext();
int dropAction = e.getDropAction();
if ((dropAction & mAllowedDragAction) != 0) {
// if (cursor != null)
// context.setCursor(cursor);
// else
context.setCursor(DragSource.DefaultCopyDrop);
} else {
context.setCursor(DragSource.DefaultCopyNoDrop);
}
onDragEnter();
}
public final void dragOver(DragSourceDragEvent e)
{
onDragOver();
}
public final void dragExit(DragSourceEvent e)
{
onDragExit();
}
public final void dropActionChanged(DragSourceDragEvent e)
{
DragSourceContext context = e.getDragSourceContext();
int dropAction = e.getDropAction();
if ((dropAction & mAllowedDragAction) != 0) {
// if (cursor != null)
// context.setCursor(cursor);
// else
context.setCursor(DragSource.DefaultCopyDrop);
} else {
context.setCursor(DragSource.DefaultCopyNoDrop);
}
}
// class WindowMovingDragSourceListener extends DragSourceAdapter implements DragSourceMotionListener {
//
// private Window win;
// private boolean firstCall = true;
//
// public WindowMovingDragSourceListener(Window w) {
// win = w;
// }
//
// public void dragDropEnd(DragSourceDropEvent dsde) {
// System.err.println("dragDropEnd(): " + dsde);
// win.setVisible(false);
// firstCall = true;
// }
//
// public void dragMouseMoved(DragSourceDragEvent dsde) {
// Point p = dsde.getLocation();
// p.translate(32, 16);
// win.setLocation(p);
// if (firstCall) {
// win.setVisible(true);
// firstCall = false;
// }
// }
// }
class DGListener implements DragGestureListener
{
public void dragGestureRecognized(DragGestureEvent e)
{
onDragBegin(e);
}
}
protected void onDragBegin(DragGestureEvent e)
{
cursor = null;
if ((e.getDragAction() & mAllowedDragAction) != 0) {
Transferable transferable = getTransferable(e.getDragOrigin());
if (transferable != null) {
try {
Image img = null;
if (DragSource.isDragImageSupported() && (img = drawDragImage(transferable,400,400)) != null) {
e.startDrag(DragSource.DefaultCopyDrop, img, new Point(200, 200), transferable, this);
} else {
e.startDrag(cursor, transferable, this);
}
dragIsValidAndStarts();
} catch (InvalidDnDOperationException idoe) {
System.err.println(idoe);
}
}
}
}
public Image drawDragImage(Transferable transferable,int width,int height)
{
if (transferable instanceof MoleculeTransferable) {
try {
MoleculeTransferable t = (MoleculeTransferable) transferable;
Object o = t.getTransferData(ChemistryFlavors.DF_SERIALIZED_MOLECULE);
if (o instanceof StereoMolecule) {
StereoMolecule mol = (StereoMolecule) o;
Depictor2D depict = new Depictor2D(mol);
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D)img.getGraphics();
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
depict.validateView(g, new GenericRectangle(0, 0, width, height), AbstractDepictor.cModeInflateToMaxAVBL);
depict.paint(g);
return img;
}
} catch (IOException e1) {
System.err.println(e1);
} catch (UnsupportedFlavorException e1) {
System.err.println(e1);
}
}
return null;
}
// may be overridden
public void dragIsValidAndStarts() {}
// final Window w = new Window() {
// public void paint(Graphics g) {
// g.drawString("image", 5, 20); // or render an image via g.drawImage()
// }
// };
}