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import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.DropTargetListener;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.HTMLTransfer;
import org.eclipse.swt.dnd.RTFTransfer;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class DNDExample {
private int dragOperation = 0;
private Transfer[] dragTypes = new Transfer[0];
private Control dragControl;
private int dragControlType = 0;
private DragSource dragSource;
private String dragDataText;
private String dragDataRTF;
private String dragDataHTML;
private String[] dragDataFiles;
private List fileList;
private boolean dragEnabled = false;
private int dropOperation = 0;
private int dropFeedback = 0;
private int dropDefaultOperation = 0;
private Transfer[] dropTypes = new Transfer[0];
private DropTarget dropTarget;
private Control dropControl;
private int dropControlType = 0;
private Composite defaultParent;
private boolean dropEnabled = false;
private Text dragConsole;
private boolean dragEventDetail = false;
private Text dropConsole;
private boolean dropEventDetail = false;
private static final int BUTTON_TOGGLE = 0;
private static final int BUTTON_RADIO = 1;
private static final int BUTTON_CHECK = 2;
private static final int CANVAS = 3;
private static final int LABEL = 4;
private static final int LIST = 5;
private static final int TABLE = 6;
private static final int TREE = 7;
private static final int TEXT = 8;
public static void main(String[] args) {
Display display = new Display();
DNDExample example = new DNDExample();
example.open(display);
display.dispose();
}
private void addDragTransfer(Transfer transfer) {
Transfer[] newTypes = new Transfer[dragTypes.length + 1];
System.arraycopy(dragTypes, 0, newTypes, 0, dragTypes.length);
newTypes[dragTypes.length] = transfer;
dragTypes = newTypes;
if (dragSource != null) {
dragSource.setTransfer(dragTypes);
}
}
private void addDropTransfer(Transfer transfer) {
Transfer[] newTypes = new Transfer[dropTypes.length + 1];
System.arraycopy(dropTypes, 0, newTypes, 0, dropTypes.length);
newTypes[dropTypes.length] = transfer;
dropTypes = newTypes;
if (dropTarget != null) {
dropTarget.setTransfer(dropTypes);
}
}
private void createDragOperations(Composite parent) {
parent.setLayout(new RowLayout(SWT.VERTICAL));
final Button moveButton = new Button(parent, SWT.CHECK);
moveButton.setText("DND.DROP_MOVE");
moveButton.setSelection(true);
dragOperation = DND.DROP_MOVE;
moveButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
dragOperation |= DND.DROP_MOVE;
} else {
dragOperation = dragOperation & ~DND.DROP_MOVE;
if (dragOperation == 0) {
dragOperation = DND.DROP_MOVE;
moveButton.setSelection(true);
}
}
if (dragEnabled) {
createDragSource();
}
}
});
Button b = new Button(parent, SWT.CHECK);
b.setText("DND.DROP_COPY");
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
dragOperation |= DND.DROP_COPY;
} else {
dragOperation = dragOperation & ~DND.DROP_COPY;
if (dragOperation == 0) {
dragOperation = DND.DROP_MOVE;
moveButton.setSelection(true);
}
}
if (dragEnabled) {
createDragSource();
}
}
});
b = new Button(parent, SWT.CHECK);
b.setText("DND.DROP_LINK");
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
dragOperation |= DND.DROP_LINK;
} else {
dragOperation = dragOperation & ~DND.DROP_LINK;
if (dragOperation == 0) {
dragOperation = DND.DROP_MOVE;
moveButton.setSelection(true);
}
}
if (dragEnabled) {
createDragSource();
}
}
});
}
private void createDragSource() {
if (dragSource != null)
dragSource.dispose();
dragSource = new DragSource(dragControl, dragOperation);
dragSource.setTransfer(dragTypes);
dragSource.addDragListener(new DragSourceListener() {
public void dragFinished(org.eclipse.swt.dnd.DragSourceEvent event) {
dragConsole.append(">>dragFinished\n");
printEvent(event);
dragDataText = dragDataRTF = dragDataHTML = null;
dragDataFiles = null;
if (event.detail == DND.DROP_MOVE) {
switch (dragControlType) {
case BUTTON_CHECK:
case BUTTON_TOGGLE:
case BUTTON_RADIO: {
Button b = (Button) dragControl;
b.setText("");
break;
}
case TABLE: {
Table table = (Table) dragControl;
TableItem[] items = table.getSelection();
for (int i = 0; i < items.length; i++) {
items[i].dispose();
}
break;
}
case TEXT: {
Text text = (Text) dragControl;
text.clearSelection();
break;
}
case TREE: {
Tree tree = (Tree) dragControl;
TreeItem[] items = tree.getSelection();
for (int i = 0; i < items.length; i++) {
items[i].dispose();
}
break;
}
case CANVAS: {
dragControl.setData("STRINGS", null);
dragControl.redraw();
break;
}
case LABEL: {
Label label = (Label) dragControl;
label.setText("");
break;
}
case LIST: {
List list = (List) dragControl;
int[] indices = list.getSelectionIndices();
list.remove(indices);
break;
}
}
}
}
public void dragSetData(org.eclipse.swt.dnd.DragSourceEvent event) {
dragConsole.append(">>dragSetData\n");
printEvent(event);
if (TextTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = dragDataText;
}
if (RTFTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = dragDataRTF;
}
if (HTMLTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = dragDataHTML;
}
if (FileTransfer.getInstance().isSupportedType(event.dataType)) {
event.data = dragDataFiles;
}
}
public void dragStart(org.eclipse.swt.dnd.DragSourceEvent event) {
dragConsole.append(">>dragStart\n");
printEvent(event);
dragDataFiles = fileList.getItems();
switch (dragControlType) {
case BUTTON_CHECK:
case BUTTON_TOGGLE:
case BUTTON_RADIO: {
Button b = (Button) dragControl;
dragDataText = b.getSelection() ? "true" : "false";
break;
}
case TABLE: {
Table table = (Table) dragControl;
TableItem[] items = table.getSelection();
if (items.length == 0) {
event.doit = false;
} else {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < items.length; i++) {
buffer.append(items[i].getText());
if (items.length > 1 && i < items.length - 1) {
buffer.append("\n");
}
}
dragDataText = buffer.toString();
}
break;
}
case TEXT: {
Text text = (Text) dragControl;
String s = text.getSelectionText();
if (s.length() == 0) {
event.doit = false;
} else {
dragDataText = s;
}
break;
}
case TREE: {
Tree tree = (Tree) dragControl;
TreeItem[] items = tree.getSelection();
if (items.length == 0) {
event.doit = false;
} else {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < items.length; i++) {
buffer.append(items[i].getText());
if (items.length > 1 && i < items.length - 1) {
buffer.append("\n");
}
}
dragDataText = buffer.toString();
}
break;
}
case CANVAS: {
String[] strings = (String[]) dragControl
.getData("STRINGS");
if (strings == null || strings.length == 0) {
event.doit = false;
} else {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < strings.length; i++) {
buffer.append(strings[i]);
if (strings.length > 1 && i < strings.length - 1) {
buffer.append("\n");
}
}
dragDataText = buffer.toString();
}
break;
}
case LABEL: {
Label label = (Label) dragControl;
String string = label.getText();
if (string.length() == 0) {
event.doit = false;
} else {
dragDataText = string;
}
break;
}
case LIST: {
List list = (List) dragControl;
String[] selection = list.getSelection();
if (selection.length == 0) {
event.doit = false;
} else {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < selection.length; i++) {
buffer.append(selection[i]);
if (selection.length > 1
&& i < selection.length - 1) {
buffer.append("\n");
}
}
dragDataText = buffer.toString();
}
break;
}
default:
throw new SWTError(SWT.ERROR_NOT_IMPLEMENTED);
}
if (dragDataText != null) {
dragDataRTF = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\cf1\\b "
+ dragDataText + "}";
dragDataHTML = "<b>" + dragDataText + "</b>";
}
for (int i = 0; i < dragTypes.length; i++) {
if (dragTypes[i] instanceof TextTransfer
&& dragDataText == null) {
event.doit = false;
}
if (dragTypes[i] instanceof RTFTransfer
&& dragDataRTF == null) {
event.doit = false;
}
if (dragTypes[i] instanceof HTMLTransfer
&& dragDataHTML == null) {
event.doit = false;
}
if (dragTypes[i] instanceof FileTransfer
&& (dragDataFiles == null || dragDataFiles.length == 0)) {
event.doit = false;
}
}
}
});
}
private void createDragTypes(Composite parent) {
parent.setLayout(new GridLayout());
Button b = new Button(parent, SWT.CHECK);
b.setText("Text Transfer");
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
addDragTransfer(TextTransfer.getInstance());
} else {
removeDragTransfer(TextTransfer.getInstance());
}
}
});
b = new Button(parent, SWT.CHECK);
b.setText("RTF Transfer");
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
addDragTransfer(RTFTransfer.getInstance());
} else {
removeDragTransfer(RTFTransfer.getInstance());
}
}
});
b = new Button(parent, SWT.CHECK);
b.setText("HTML Transfer");
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
addDragTransfer(HTMLTransfer.getInstance());
} else {
removeDragTransfer(HTMLTransfer.getInstance());
}
}
});
b = new Button(parent, SWT.CHECK);
b.setText("File Transfer");
b.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
if (b.getSelection()) {
addDragTransfer(FileTransfer.getInstance());
} else {
removeDragTransfer(FileTransfer.getInstance());
}
}
});
b = new Button(parent, SWT.PUSH);
b.setText("Select File(s)");
b.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
FileDialog dialog = new FileDialog(fileList.getShell(),
SWT.OPEN | SWT.MULTI);
String result = dialog.open();
if (result != null && result.length() > 0) {
fileList.removeAll();
String separator = System.getProperty("file.separator");
String path = dialog.getFilterPath();
String[] names = dialog.getFileNames();
for (int i = 0; i < names.length; i++) {
fileList.add(path + separator + names[i]);
}
}
}
});
fileList = new List(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
GridData data = new GridData();
data.grabExcessHorizontalSpace = true;
data.horizontalAlignment = GridData.FILL;
data.verticalAlignment = GridData.BEGINNING;
fileList.setLayoutData(data);
}
private void createDragWidget(Composite parent) {
parent.setLayout(new FormLayout());
Combo combo = new Combo(parent, SWT.READ_ONLY);
combo.setItems(new String[] { "Toggle Button", "Radio Button",
"Checkbox", "Canvas", "Label", "List", "Table", "Tree" });
combo.select(LABEL);
dragControlType = combo.getSelectionIndex();
dragControl = createWidget(dragControlType, parent, "Drag Source");
combo.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Object data = dragControl.getLayoutData();
Composite parent = dragControl.getParent();
dragControl.dispose();
Combo c = (Combo) e.widget;
dragControlType = c.getSelectionIndex();
dragControl = createWidget(dragControlType, parent,
"Drag Source");
dragControl.setLayoutData(data);
if (dragEnabled)
createDragSource();
parent.layout();
}
});
Button b = new Button(parent, SWT.CHECK);
b.setText("DragSource");
b.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
Button b = (Button) e.widget;
dragEnabled = b.getSelection();
if (dragEnabled) {
createDragSource();
} else {
if (dragSource != null) {
dragSource.dispose();
}
dragSource = null;
}
}
});
FormData data = new FormData();
data.top = new FormAttachment(0, 10);
data.bottom = new FormAttachment(combo, -10);
data.left = new FormAttachment(0, 10);
data.right = new FormAttachment(100, -10);
dragControl.setLayoutData(data);
data = new FormData();
data.bottom = new FormAttachment(100, -10);
data.left = new FormAttachment(0, 10);
combo.setLayoutData(data);
data = new FormData();
data.bottom = new FormAttachment(100, -10);
data.left = new FormAttachment(combo, 10);
b.setLayoutData(data);
}
private void createDropOperations(
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