Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2008 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 * Igor Fedorenko <igorfie@yahoo.com> - * Fix for Bug 136921 [IDE] New File dialog locks for 20 seconds *******************************************************************************/ package com.binge.workforce.widgets.internal; import java.util.ArrayList; import java.util.List; import org.eclipse.core.resources.IContainer; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.Path; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.osgi.util.TextProcessor; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Text; /** * Workbench-level composite for choosing a container. */ public class ContainerSelectionGroup extends Composite { // The listener to notify of events private Listener listener; // Enable user to type in new container name private boolean allowNewContainerName = true; // show all projects by default private boolean showClosedProjects = true; // Last selection made by user private IContainer selectedContainer; // handle on parts private Text containerNameField; TreeViewer treeViewer; private IImageService imageService; // the message to display at the top of this dialog private static final String DEFAULT_MSG_NEW_ALLOWED = Messages.ContainerGroup_message; private static final String DEFAULT_MSG_SELECT_ONLY = Messages.ContainerGroup_selectFolder; // sizing constants private static final int SIZING_SELECTION_PANE_WIDTH = 320; private static final int SIZING_SELECTION_PANE_HEIGHT = 300; /** * Creates a new instance of the widget. * * @param parent * The parent widget of the group. * @param listener * A listener to forward events to. Can be null if no listener is * required. * @param allowNewContainerName * Enable the user to type in a new container name instead of * just selecting from the existing ones. */ public ContainerSelectionGroup(Composite parent, Listener listener, boolean allowNewContainerName, IImageService imageService) { this(parent, listener, allowNewContainerName, null, imageService); } /** * Creates a new instance of the widget. * * @param parent * The parent widget of the group. * @param listener * A listener to forward events to. Can be null if no listener is * required. * @param allowNewContainerName * Enable the user to type in a new container name instead of * just selecting from the existing ones. * @param message * The text to present to the user. */ public ContainerSelectionGroup(Composite parent, Listener listener, boolean allowNewContainerName, String message, IImageService imageService) { this(parent, listener, allowNewContainerName, message, true, imageService); } /** * Creates a new instance of the widget. * * @param parent * The parent widget of the group. * @param listener * A listener to forward events to. Can be null if no listener is * required. * @param allowNewContainerName * Enable the user to type in a new container name instead of * just selecting from the existing ones. * @param message * The text to present to the user. * @param showClosedProjects * Whether or not to show closed projects. */ public ContainerSelectionGroup(Composite parent, Listener listener, boolean allowNewContainerName, String message, boolean showClosedProjects, IImageService imageService) { this(parent, listener, allowNewContainerName, message, showClosedProjects, SIZING_SELECTION_PANE_HEIGHT, SIZING_SELECTION_PANE_WIDTH, imageService); } /** * Creates a new instance of the widget. * * @param parent * The parent widget of the group. * @param listener * A listener to forward events to. Can be null if no listener is * required. * @param allowNewContainerName * Enable the user to type in a new container name instead of * just selecting from the existing ones. * @param message * The text to present to the user. * @param showClosedProjects * Whether or not to show closed projects. * @param heightHint * height hint for the drill down composite * @param widthHint * width hint for the drill down composite */ public ContainerSelectionGroup(Composite parent, Listener listener, boolean allowNewContainerName, String message, boolean showClosedProjects, int heightHint, int widthHint, IImageService imageService) { super(parent, SWT.NONE); this.imageService = imageService; this.listener = listener; this.allowNewContainerName = allowNewContainerName; this.showClosedProjects = showClosedProjects; if (message != null) { createContents(message, heightHint, widthHint); } else if (allowNewContainerName) { createContents(DEFAULT_MSG_NEW_ALLOWED, heightHint, widthHint); } else { createContents(DEFAULT_MSG_SELECT_ONLY, heightHint, widthHint); } } /** * The container selection has changed in the tree view. Update the * container name field value and notify all listeners. * * @param container * The container that changed */ public void containerSelectionChanged(IContainer container) { selectedContainer = container; if (allowNewContainerName) { if (container == null) { containerNameField.setText("");//$NON-NLS-1$ } else { String text = TextProcessor.process(container.getFullPath().makeRelative().toString()); containerNameField.setText(text); containerNameField.setToolTipText(text); } } // fire an event so the parent can update its controls if (listener != null) { Event changeEvent = new Event(); changeEvent.type = SWT.Selection; changeEvent.widget = this; listener.handleEvent(changeEvent); } } /** * Creates the contents of the composite. * * @param message */ public void createContents(String message) { createContents(message, SIZING_SELECTION_PANE_HEIGHT, SIZING_SELECTION_PANE_WIDTH); } /** * Creates the contents of the composite. * * @param message * @param heightHint * @param widthHint */ public void createContents(String message, int heightHint, int widthHint) { GridLayout layout = new GridLayout(); layout.marginWidth = 0; setLayout(layout); setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); Label label = new Label(this, SWT.WRAP); label.setText(message); label.setFont(this.getFont()); if (allowNewContainerName) { containerNameField = new Text(this, SWT.SINGLE | SWT.BORDER); GridData gd = new GridData(GridData.FILL_HORIZONTAL); gd.widthHint = widthHint; containerNameField.setLayoutData(gd); containerNameField.addListener(SWT.Modify, listener); containerNameField.setFont(this.getFont()); } else { // filler... new Label(this, SWT.NONE); } createTreeViewer(heightHint); Dialog.applyDialogFont(this); } /** * Returns a new drill down viewer for this dialog. * * @param heightHint * height hint for the drill down composite */ protected void createTreeViewer(int heightHint) { // Create drill down. DrillDownComposite drillDown = new DrillDownComposite(this, SWT.BORDER, imageService); GridData spec = new GridData(SWT.FILL, SWT.FILL, true, true); spec.widthHint = SIZING_SELECTION_PANE_WIDTH; spec.heightHint = heightHint; drillDown.setLayoutData(spec); // Create tree viewer inside drill down. treeViewer = new TreeViewer(drillDown, SWT.NONE); drillDown.setChildTree(treeViewer); ContainerContentProvider cp = new ContainerContentProvider(); cp.showClosedProjects(showClosedProjects); treeViewer.setContentProvider(cp); //FIXME We need a WorkbenchLabelProvider replacement // treeViewer.setLabelProvider(WorkbenchLabelProvider // .getDecoratingWorkbenchLabelProvider()); treeViewer.setComparator(new ViewerComparator()); treeViewer.setUseHashlookup(true); treeViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { IStructuredSelection selection = (IStructuredSelection) event.getSelection(); containerSelectionChanged((IContainer) selection.getFirstElement()); // allow null } }); treeViewer.addDoubleClickListener(new IDoubleClickListener() { public void doubleClick(DoubleClickEvent event) { ISelection selection = event.getSelection(); if (selection instanceof IStructuredSelection) { Object item = ((IStructuredSelection) selection).getFirstElement(); if (item == null) { return; } if (treeViewer.getExpandedState(item)) { treeViewer.collapseToLevel(item, 1); } else { treeViewer.expandToLevel(item, 1); } } } }); // This has to be done after the viewer has been laid out treeViewer.setInput(ResourcesPlugin.getWorkspace()); } /** * Returns the currently entered container name. Null if the field is empty. * Note that the container may not exist yet if the user entered a new * container name in the field. * * @return IPath */ public IPath getContainerFullPath() { if (allowNewContainerName) { String pathName = containerNameField.getText(); if (pathName == null || pathName.length() < 1) { return null; } // The user may not have made this absolute so do it for them return (new Path(TextProcessor.deprocess(pathName))).makeAbsolute(); } if (selectedContainer == null) return null; return selectedContainer.getFullPath(); } /** * Gives focus to one of the widgets in the group, as determined by the * group. */ public void setInitialFocus() { if (allowNewContainerName) { containerNameField.setFocus(); } else { treeViewer.getTree().setFocus(); } } /** * Sets the selected existing container. * * @param container */ public void setSelectedContainer(IContainer container) { selectedContainer = container; // expand to and select the specified container List<IContainer> itemsToExpand = new ArrayList<IContainer>(); IContainer parent = container.getParent(); while (parent != null) { itemsToExpand.add(0, parent); parent = parent.getParent(); } treeViewer.setExpandedElements(itemsToExpand.toArray()); treeViewer.setSelection(new StructuredSelection(container), true); } }