Dropped data type depends on target item in table
/*
* Dropped data type depends on target item in table
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import java.io.File;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
public class Snippet185 {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
Label label1 = new Label(shell, SWT.BORDER);
label1.setText("Drag Source");
final Table table = new Table(shell, SWT.BORDER);
for (int i = 0; i < 4; i++) {
TableItem item = new TableItem(table, SWT.NONE);
if (i % 2 == 0)
item.setText("Drop a file");
if (i % 2 == 1)
item.setText("Drop text");
}
DragSource dragSource = new DragSource(label1, DND.DROP_COPY);
dragSource.setTransfer(new Transfer[] { TextTransfer.getInstance(),
FileTransfer.getInstance() });
dragSource.addDragListener(new DragSourceAdapter() {
public void dragSetData(DragSourceEvent event) {
if (FileTransfer.getInstance().isSupportedType(event.dataType)) {
File file = new File("temp");
event.data = new String[] { file.getAbsolutePath() };
}
if (TextTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = "once upon a time";
}
}
});
DropTarget dropTarget = new DropTarget(table, DND.DROP_COPY
| DND.DROP_DEFAULT);
dropTarget.setTransfer(new Transfer[] { TextTransfer.getInstance(),
FileTransfer.getInstance() });
dropTarget.addDropListener(new DropTargetAdapter() {
FileTransfer fileTransfer = FileTransfer.getInstance();
TextTransfer textTransfer = TextTransfer.getInstance();
public void dragEnter(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT)
event.detail = DND.DROP_COPY;
}
public void dragOperationChanged(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT)
event.detail = DND.DROP_COPY;
}
public void dragOver(DropTargetEvent event) {
event.detail = DND.DROP_NONE;
TableItem item = (TableItem) event.item;
if (item == null)
return;
int itemIndex = table.indexOf(item);
if (itemIndex % 2 == 0) {
int index = 0;
while (index < event.dataTypes.length) {
if (fileTransfer
.isSupportedType(event.dataTypes[index]))
break;
index++;
}
if (index < event.dataTypes.length) {
event.currentDataType = event.dataTypes[index];
event.detail = DND.DROP_COPY;
return;
}
} else {
int index = 0;
while (index < event.dataTypes.length) {
if (textTransfer
.isSupportedType(event.dataTypes[index]))
break;
index++;
}
if (index < event.dataTypes.length) {
event.currentDataType = event.dataTypes[index];
event.detail = DND.DROP_COPY;
return;
}
}
}
public void drop(DropTargetEvent event) {
TableItem item = (TableItem) event.item;
if (item == null) {
event.detail = DND.DROP_NONE;
return;
}
if (fileTransfer.isSupportedType(event.currentDataType)) {
String[] files = (String[]) event.data;
if (files != null && files.length > 0) {
item.setText(files[0]);
}
}
if (textTransfer.isSupportedType(event.currentDataType)) {
String text = (String) event.data;
if (text != null) {
item.setText(text);
}
}
}
});
shell.setSize(300, 150);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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