Mega Code Archive
Drag and Drop
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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
//package org.eclipse.swt.snippets;
/*
* Drag and Drop example snippet: determine native data types available (motif only)
* NOTE: This snippet uses internal SWT packages that are
* subject to change without notice.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.motif.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet158 extends ByteArrayTransfer {
private static Snippet158 _instance = new Snippet158();
private int[] ids;
private String[] names;
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Table control = new Table(shell, SWT.NONE);
TableItem item = new TableItem(control, SWT.NONE);
item.setText("Drag data over this site to see the native transfer type.");
DropTarget target = new DropTarget(control, DND.DROP_DEFAULT | DND.DROP_COPY | DND.DROP_LINK
| DND.DROP_MOVE);
target.setTransfer(new Transfer[] { Snippet158.getInstance() });
target.addDropListener(new DropTargetAdapter() {
public void dragEnter(DropTargetEvent event) {
String ops = "";
if ((event.operations & DND.DROP_COPY) != 0)
ops += "Copy;";
if ((event.operations & DND.DROP_MOVE) != 0)
ops += "Move;";
if ((event.operations & DND.DROP_LINK) != 0)
ops += "Link;";
control.removeAll();
TableItem item1 = new TableItem(control, SWT.NONE);
item1.setText("Allowed Operations are " + ops);
if (event.detail == DND.DROP_DEFAULT) {
if ((event.operations & DND.DROP_COPY) != 0) {
event.detail = DND.DROP_COPY;
} else if ((event.operations & DND.DROP_LINK) != 0) {
event.detail = DND.DROP_LINK;
} else if ((event.operations & DND.DROP_MOVE) != 0) {
event.detail = DND.DROP_MOVE;
}
}
TransferData[] data = event.dataTypes;
for (int i = 0; i < data.length; i++) {
int id = data[i].type;
String name = getNameFromId(id);
TableItem item2 = new TableItem(control, SWT.NONE);
item2.setText("Data type is " + id + " " + name);
}
}
});
shell.setSize(400, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
public static Snippet158 getInstance() {
return _instance;
}
Snippet158() {
}
public void javaToNative(Object object, TransferData transferData) {
}
public Object nativeToJava(TransferData transferData) {
return "Hello World";
}
protected String[] getTypeNames() {
return names;
}
static int shellHandle;
protected int[] getTypeIds() {
if (ids == null) {
Display display = Display.getCurrent();
int widgetClass = OS.topLevelShellWidgetClass();
shellHandle = OS.XtAppCreateShell(null, null, widgetClass, display.xDisplay, null, 0);
OS.XtSetMappedWhenManaged(shellHandle, false);
OS.XtRealizeWidget(shellHandle);
ids = new int[840];
names = new String[840];
for (int i = 0; i < ids.length; i++) {
ids[i] = i + i;
names[i] = getNameFromId(i + 1);
}
}
return ids;
}
static String getNameFromId(int id) {
int xDisplay = OS.XtDisplay(shellHandle);
int ptr = 0;
try {
ptr = OS.XmGetAtomName(xDisplay, id);
} catch (Throwable t) {
}
if (ptr == 0)
return "invalid " + id;
int length = OS.strlen(ptr);
byte[] nameBuf = new byte[length];
OS.memmove(nameBuf, ptr, length);
OS.XFree(ptr);
return new String(Converter.mbcsToWcs(null, nameBuf)).toLowerCase();
}
}
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