Snippet158.java Source code

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Here is the source code for Snippet158.java

Source

/*******************************************************************************
 * 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();
    }
}