| /******************************************************************************* |
| * Copyright (c) 2007, 2016 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 text selection within a StyledText widget |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.3 |
| */ |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.custom.*; |
| import org.eclipse.swt.dnd.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet257 { |
| |
| static String string1 = "A drag source is the provider of data in a Drag and Drop data transfer as well as "+ |
| "the originator of the Drag and Drop operation. The data provided by the drag source "+ |
| "may be transferred to another location in the same widget, to a different widget "+ |
| "within the same application, or to a different application altogether. For example, "+ |
| "you can drag text from your application and drop it on an email application, or you "+ |
| "could drag an item in a tree and drop it below a different node in the same tree."; |
| |
| static String DRAG_START_DATA = "DRAG_START_DATA"; |
| |
| public static void main (String [] args) { |
| final Display display = new Display (); |
| Shell shell = new Shell (display); |
| shell.setLayout(new FillLayout()); |
| shell.setSize(100, 300); |
| int style = SWT.MULTI | SWT.WRAP | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER; |
| final StyledText text = new StyledText(shell, style); |
| text.setText(string1); |
| final DragSource source = new DragSource(text, DND.DROP_COPY | DND.DROP_MOVE); |
| source.setDragSourceEffect(new DragSourceEffect(text) { |
| @Override |
| public void dragStart(DragSourceEvent event) { |
| event.image = display.getSystemImage(SWT.ICON_WARNING); |
| } |
| }); |
| source.setTransfer(TextTransfer.getInstance()); |
| source.addDragListener(new DragSourceAdapter() { |
| Point selection; |
| @Override |
| public void dragStart(DragSourceEvent event) { |
| selection = text.getSelection(); |
| event.doit = selection.x != selection.y; |
| text.setData(DRAG_START_DATA, selection); |
| } |
| @Override |
| public void dragSetData(DragSourceEvent e) { |
| e.data = text.getText(selection.x, selection.y-1); |
| } |
| @Override |
| public void dragFinished(DragSourceEvent event) { |
| if (event.detail == DND.DROP_MOVE) { |
| Point newSelection= text.getSelection(); |
| int length = selection.y - selection.x; |
| int delta = 0; |
| if (newSelection.x < selection.x) |
| delta = length; |
| text.replaceTextRange(selection.x + delta, length, ""); |
| } |
| selection = null; |
| text.setData(DRAG_START_DATA, null); |
| } |
| }); |
| |
| DropTarget target = new DropTarget(text, DND.DROP_DEFAULT | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK); |
| target.setTransfer(new Transfer[] {TextTransfer.getInstance()}); |
| target.addDropListener(new DropTargetAdapter() { |
| @Override |
| public void dragEnter(DropTargetEvent event) { |
| if (event.detail == DND.DROP_DEFAULT) { |
| if (text.getData(DRAG_START_DATA) == null) |
| event.detail = DND.DROP_COPY; |
| else |
| event.detail = DND.DROP_MOVE; |
| } |
| } |
| @Override |
| public void dragOperationChanged(DropTargetEvent event) { |
| if (event.detail == DND.DROP_DEFAULT) { |
| if (text.getData(DRAG_START_DATA) == null) |
| event.detail = DND.DROP_COPY; |
| else |
| event.detail = DND.DROP_MOVE; |
| } |
| } |
| @Override |
| public void dragOver(DropTargetEvent event) { |
| event.feedback = DND.FEEDBACK_SCROLL | DND.FEEDBACK_SELECT; |
| } |
| @Override |
| public void drop(DropTargetEvent event) { |
| if (event.detail != DND.DROP_NONE) { |
| Point selection = (Point) text.getData(DRAG_START_DATA); |
| int insertPos = text.getCaretOffset(); |
| if (event.detail == DND.DROP_MOVE && selection != null && selection.x <= insertPos && insertPos <= selection.y |
| || event.detail == DND.DROP_COPY && selection != null && selection.x < insertPos && insertPos < selection.y) { |
| text.setSelection(selection); |
| event.detail = DND.DROP_COPY; // prevent source from deleting selection |
| } else { |
| String string = (String)event.data; |
| text.insert(string); |
| if (selection != null) |
| text.setSelectionRange(insertPos, string.length()); |
| } |
| } |
| } |
| }); |
| shell.open (); |
| while (!shell.isDisposed ()) { |
| if (!display.readAndDispatch ()) display.sleep (); |
| } |
| display.dispose (); |
| } |
| |
| } |