| /******************************************************************************* |
| * 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: drag leaf items in a tree |
| * |
| * 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.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet91 { |
| |
| public static void main (String [] args) { |
| |
| final Display display = new Display (); |
| final Shell shell = new Shell (display); |
| shell.setLayout(new FillLayout()); |
| final Tree tree = new Tree(shell, SWT.BORDER); |
| for (int i = 0; i < 3; i++) { |
| TreeItem item = new TreeItem(tree, SWT.NONE); |
| item.setText("item "+i); |
| for (int j = 0; j < 3; j++) { |
| TreeItem subItem = new TreeItem(item, SWT.NONE); |
| subItem.setText("item "+i+" "+j); |
| for (int k = 0; k < 3; k++) { |
| TreeItem subsubItem = new TreeItem(subItem, SWT.NONE); |
| subsubItem.setText("item "+i+" "+j+" "+k); |
| } |
| } |
| } |
| |
| Transfer[] types = new Transfer[] {TextTransfer.getInstance()}; |
| int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK; |
| |
| final DragSource source = new DragSource (tree, operations); |
| source.setTransfer(types); |
| final TreeItem[] dragSourceItem = new TreeItem[1]; |
| source.addDragListener (new DragSourceListener () { |
| public void dragStart(DragSourceEvent event) { |
| TreeItem[] selection = tree.getSelection(); |
| if (selection.length > 0 && selection[0].getItemCount() == 0) { |
| event.doit = true; |
| dragSourceItem[0] = selection[0]; |
| } else { |
| event.doit = false; |
| } |
| }; |
| public void dragSetData (DragSourceEvent event) { |
| event.data = dragSourceItem[0].getText(); |
| } |
| public void dragFinished(DragSourceEvent event) { |
| if (event.detail == DND.DROP_MOVE) |
| dragSourceItem[0].dispose(); |
| dragSourceItem[0] = null; |
| } |
| }); |
| |
| DropTarget target = new DropTarget(tree, operations); |
| target.setTransfer(types); |
| target.addDropListener (new DropTargetAdapter() { |
| public void dragOver(DropTargetEvent event) { |
| event.feedback = DND.FEEDBACK_EXPAND | DND.FEEDBACK_SCROLL; |
| if (event.item != null) { |
| TreeItem item = (TreeItem)event.item; |
| Point pt = display.map(null, tree, event.x, event.y); |
| Rectangle bounds = item.getBounds(); |
| if (pt.y < bounds.y + bounds.height/3) { |
| event.feedback |= DND.FEEDBACK_INSERT_BEFORE; |
| } else if (pt.y > bounds.y + 2*bounds.height/3) { |
| event.feedback |= DND.FEEDBACK_INSERT_AFTER; |
| } else { |
| event.feedback |= DND.FEEDBACK_SELECT; |
| } |
| } |
| } |
| public void drop(DropTargetEvent event) { |
| if (event.data == null) { |
| event.detail = DND.DROP_NONE; |
| return; |
| } |
| String text = (String)event.data; |
| if (event.item == null) { |
| TreeItem item = new TreeItem(tree, SWT.NONE); |
| item.setText(text); |
| } else { |
| TreeItem item = (TreeItem)event.item; |
| Point pt = display.map(null, tree, event.x, event.y); |
| Rectangle bounds = item.getBounds(); |
| TreeItem parent = item.getParentItem(); |
| if (parent != null) { |
| TreeItem[] items = parent.getItems(); |
| int index = 0; |
| for (int i = 0; i < items.length; i++) { |
| if (items[i] == item) { |
| index = i; |
| break; |
| } |
| } |
| if (pt.y < bounds.y + bounds.height/3) { |
| TreeItem newItem = new TreeItem(parent, SWT.NONE, index); |
| newItem.setText(text); |
| } else if (pt.y > bounds.y + 2*bounds.height/3) { |
| TreeItem newItem = new TreeItem(parent, SWT.NONE, index+1); |
| newItem.setText(text); |
| } else { |
| TreeItem newItem = new TreeItem(item, SWT.NONE); |
| newItem.setText(text); |
| } |
| |
| } else { |
| TreeItem[] items = tree.getItems(); |
| int index = 0; |
| for (int i = 0; i < items.length; i++) { |
| if (items[i] == item) { |
| index = i; |
| break; |
| } |
| } |
| if (pt.y < bounds.y + bounds.height/3) { |
| TreeItem newItem = new TreeItem(tree, SWT.NONE, index); |
| newItem.setText(text); |
| } else if (pt.y > bounds.y + 2*bounds.height/3) { |
| TreeItem newItem = new TreeItem(tree, SWT.NONE, index+1); |
| newItem.setText(text); |
| } else { |
| TreeItem newItem = new TreeItem(item, SWT.NONE); |
| newItem.setText(text); |
| } |
| } |
| |
| |
| } |
| } |
| }); |
| |
| shell.setSize (400, 400); |
| shell.open (); |
| while (!shell.isDisposed ()) { |
| if (!display.readAndDispatch ()) display.sleep (); |
| } |
| display.dispose (); |
| } |
| } |