Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2005 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 com.architexa.org.eclipse.gef.ui.parts; import com.architexa.org.eclipse.draw2d.geometry.Point; import com.architexa.org.eclipse.gef.EditPart; import com.architexa.org.eclipse.gef.EditPartViewer; import com.architexa.org.eclipse.gef.TreeEditPart; import com.architexa.org.eclipse.gef.editparts.RootTreeEditPart; import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.eclipse.swt.SWT; import org.eclipse.swt.events.FocusEvent; import org.eclipse.swt.events.FocusListener; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.KeyListener; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.MouseListener; import org.eclipse.swt.events.MouseMoveListener; import org.eclipse.swt.events.MouseTrackListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; import org.eclipse.swt.widgets.Widget; import org.eclipse.jface.viewers.StructuredSelection; /** * An EditPartViewer implementation based on a {@link org.eclipse.swt.widgets.Tree}. * @author hudsonr */ public class TreeViewer extends AbstractEditPartViewer { private boolean ignore = false; class EventDispatcher implements MouseListener, MouseMoveListener, KeyListener, MouseTrackListener, FocusListener { protected static final int ANY_BUTTON = SWT.BUTTON1 | SWT.BUTTON2 | SWT.BUTTON3; public void keyPressed(KeyEvent kee) { getEditDomain().keyDown(kee, TreeViewer.this); } public void keyReleased(KeyEvent kee) { getEditDomain().keyUp(kee, TreeViewer.this); } public void mouseDoubleClick(MouseEvent me) { getEditDomain().mouseDoubleClick(me, TreeViewer.this); } public void mouseDown(MouseEvent me) { getEditDomain().mouseDown(me, TreeViewer.this); } public void mouseEnter(MouseEvent me) { getEditDomain().viewerEntered(me, TreeViewer.this); } public void mouseExit(MouseEvent me) { getEditDomain().viewerExited(me, TreeViewer.this); } public void mouseHover(MouseEvent me) { getEditDomain().mouseHover(me, TreeViewer.this); } public void mouseMove(MouseEvent me) { if ((me.stateMask & ANY_BUTTON) != 0) getEditDomain().mouseDrag(me, TreeViewer.this); else getEditDomain().mouseMove(me, TreeViewer.this); } public void mouseUp(MouseEvent me) { getEditDomain().mouseUp(me, TreeViewer.this); } public void focusGained(FocusEvent event) { getEditDomain().focusGained(event, TreeViewer.this); } public void focusLost(FocusEvent event) { getEditDomain().focusLost(event, TreeViewer.this); } } private EventDispatcher dispatcher; /** * Constructs a TreeViewer with the default root editpart. */ public TreeViewer() { dispatcher = new EventDispatcher(); RootTreeEditPart rep = new RootTreeEditPart(); setRootEditPart(rep); addDragSourceListener(new TreeViewerTransferDragListener(this)); addDropTargetListener(new TreeViewerTransferDropListener(this)); } /** * Creates the default tree and sets it as the control. The default styles will show * scrollbars as needed, and allows for multiple selection. * @param parent The parent for the Tree * @return the control */ public Control createControl(Composite parent) { Tree tree = new Tree(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL); setControl(tree); return tree; } /** * @see com.architexa.org.eclipse.gef.EditPartViewer#findObjectAtExcluding(Point, Collection, * EditPartViewer.Conditional) */ public EditPart findObjectAtExcluding(Point pt, Collection exclude, Conditional condition) { if (getControl() == null) return null; Tree tree = (Tree) getControl(); Rectangle area = tree.getClientArea(); if (pt.x < 0 || pt.y < 0 || pt.x >= area.width || pt.y >= area.height) return null; EditPart result = null; TreeItem tie = tree.getItem(new org.eclipse.swt.graphics.Point(pt.x, pt.y)); if (tie != null) { result = (EditPart) tie.getData(); } else { result = (EditPart) tree.getData(); } while (result != null) { if ((condition == null || condition.evaluate(result)) && !exclude.contains(result)) return result; result = result.getParent(); } return null; } /** * @see com.architexa.org.eclipse.gef.ui.parts.AbstractEditPartViewer#fireSelectionChanged() */ protected void fireSelectionChanged() { super.fireSelectionChanged(); showSelectionInTree(); } /** * "Hooks up" a Control, i.e. sets it as the control for the RootTreeEditPart, * adds necessary listener for proper operation, etc. */ protected void hookControl() { if (getControl() == null) return; final Tree tree = (Tree) getControl(); tree.addFocusListener(dispatcher); tree.addMouseListener(dispatcher); tree.addMouseMoveListener(dispatcher); tree.addKeyListener(dispatcher); tree.addMouseTrackListener(dispatcher); tree.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { TreeItem[] ties = tree.getSelection(); Object newSelection[] = new Object[ties.length]; for (int i = 0; i < ties.length; i++) newSelection[i] = ties[i].getData(); ignore = true; setSelection(new StructuredSelection(newSelection)); ignore = false; } public void widgetDefaultSelected(SelectionEvent e) { widgetSelected(e); } }); TreeEditPart tep = (TreeEditPart) getRootEditPart(); tep.setWidget(tree); super.hookControl(); } /** * @see com.architexa.org.eclipse.gef.ui.parts.AbstractEditPartViewer#reveal(com.architexa.org.eclipse.gef.EditPart) */ public void reveal(EditPart part) { if (!(part instanceof TreeEditPart)) return; TreeEditPart treePart = (TreeEditPart) part; Tree tree = (Tree) getControl(); Widget widget = treePart.getWidget(); if (widget instanceof TreeItem) tree.showItem((TreeItem) widget); } private void showSelectionInTree() { if (ignore || getControl() == null || getControl().isDisposed()) return; List selection = getSelectedEditParts(); Tree tree = (Tree) getControl(); List treeParts = new ArrayList(); for (int i = 0; i < selection.size(); i++) { TreeEditPart part = (TreeEditPart) selection.get(i); if (part.getWidget() instanceof TreeItem) treeParts.add(part); } TreeItem[] treeItems = new TreeItem[treeParts.size()]; for (int i = 0; i < treeParts.size(); i++) { TreeEditPart part = (TreeEditPart) treeParts.get(i); treeItems[i] = (TreeItem) part.getWidget(); } tree.setSelection(treeItems); } /** * Unhooks a control so that it can be reset. This method deactivates * the contents, removes the Control as being the Control of the * RootTreeEditPart, etc. It does not remove the listeners because * it is causing errors, although that would be a desirable outcome. */ protected void unhookControl() { if (getControl() == null) return; super.unhookControl(); // Ideally, you would want to remove the listeners here TreeEditPart tep = (TreeEditPart) getRootEditPart(); tep.setWidget(null); } }