The html code is like this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns:j="http://www.oracle.com/swing">
<head>
<title>DND test</title>
<meta name='display-as' content="frame"/>
<meta name='size' content="800 600"/>
<meta name='onclose' content="exit"/>
</head>
<body style="display: border;">
<table>
<tr>
<td width="fill" height="fill">
<div>
<input type="text" text='test' align="top" dragsource='true'/>
<j:scroll>
<j:list id='source' droptarget='true'
ondblclick='onDblclick' selectedElements='${model.selectedSource}'
dragsource='true' accept-mime='sht/tag-source' ondrop='onDrop'>
<j:selectItems value='${source}'/>
</j:list>
</j:scroll>
</div>
</td>
<td width="fill">
<j:scroll>
<j:list id='target' droptarget='true'
ondblclick='onDblclick' selectedElements='${model.selectedTarget}'
dragsource='true' accept-mime='sht/tag-source' ondrop='onDrop'>
<j:selectItems value='${target}'/>
</j:list>
</j:scroll>
</td>
</tr>
</table>
</body>
</html>
Object, that can be used as dnd source, a marked with attribute
dragsource='true'. Dnd targets are marked with droptarget='true'. accept-mime specifies the mime for DataFlavor which will be accepted by component. If not specified it will accept any flavor.The source tag must be able to produce data to be carried in transferData. Currently there is a helper service, which creates transfer data from selection in JTable, JTextComponent, JList and JTree (it depends in tag's component type, not on tag type). After merge to main project this creation process will move to tag. The mime for created transferable is
sht/tag-source.ondrop='onDrop' specifies method name to be invoked on dnd drop. It recieve DropTargetDropEvent as parameter and must return true on drop accept.Controller's code is under the cut.
package ru.swing.html.sandbox.dnd;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jdesktop.observablecollections.ObservableCollections;
import org.jdom.JDOMException;
import ru.swing.html.Binder;
import ru.swing.html.DomLoader;
import ru.swing.html.DomModel;
import ru.swing.html.ModelElement;
import ru.swing.html.configuration.DefaultAttributeParser;
import ru.swing.html.tags.*;
import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.lang.Object;
import java.util.*;
import java.util.List;
public class DndForm extends JFrame {
private Log logger = LogFactory.getLog(getClass());
@ModelElement("source")
private java.util.List source;
@ModelElement("target")
private java.util.List target;
private DomModel model;
@ModelElement("model")
private Model formModel = new Model();
public DndForm() throws JDOMException, IOException {
source = ObservableCollections.observableList(new ArrayListObject());
target = ObservableCollections.observableList(new ArrayListObject());
source.add("Item 1");
source.add("Item 2");
source.add("Item 3");
source.add("Item 4");
model = DomLoader.loadModel(getClass().getResourceAsStream("/ru/swing/html/sandbox/dnd/DndForm.html"));
DefaultAttributeParser parser = (DefaultAttributeParser) model.getConfiguration().getAttributeParser();
parser.setParserForAttribute("dragsource", new DragSourceAttributeParser());
parser.setParserForAttribute("droptarget", new DropTargetAttributeParser());
Binder.bind(this, true, model);
}
public void onDblclick(MouseEvent e) {
Tag sourceTag = model.query((JComponent)e.getSource()).get(0);
Collection source;
Collection target;
Collection selection;
if (sourceTag.getId().equals("source")) {
source = this.source;
target = this.target;
selection = formModel.selectedSource;
}
else {
source = this.target;
target = this.source;
selection = formModel.selectedTarget;
}
target.addAll(selection);
source.removeAll(selection);
}
public boolean onDrop(DropTargetDropEvent e) {
DropTarget source1 = (DropTarget) e.getSource();
Tag sourceTag = model.query((JComponent) source1.getComponent()).get(0);
Collection source;
Collection target;
if (sourceTag.getId().equals("source")) {
source = this.target;
target = this.source;
}
else {
source = this.source;
target = this.target;
}
Object transferData = null;
try {
transferData = e.getTransferable().getTransferData(DragSourceAttributeParser.tagDataVlavor);
} catch (UnsupportedFlavorException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
if (transferData instanceof Object[]) {
Object[] data = (Object[]) transferData;
Set set = new TreeSet();
set.addAll(target);
set.addAll(Arrays.asList(data));
target.clear();
target.addAll(set);
source.removeAll(Arrays.asList(data));
logger.info("Dropped array: "+ data[0]);
}
else {
logger.info("Dropped: "+ transferData);
}
return false;
}
public static void main(String[] args) throws JDOMException, IOException {
final DndForm form = new DndForm();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
form.setVisible(true);
}
});
}
public class Model {
private java.util.List selectedSource = ObservableCollections.observableList(new ArrayList());
private java.util.List selectedTarget = ObservableCollections.observableList(new ArrayList());
public List getSelectedSource() {
return selectedSource;
}
public void setSelectedSource(List selectedSource) {
this.selectedSource = selectedSource;
}
public List getSelectedTarget() {
return selectedTarget;
}
public void setSelectedTarget(List selectedTarget) {
this.selectedTarget = selectedTarget;
}
}
}
I've also added dblclick handling. You can move items from one list to another with dnd or dblclick.
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