/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials  * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.examples.fileviewer;import org.eclipse.swt.*;import org.eclipse.swt.custom.*;import org.eclipse.swt.dnd.*;import org.eclipse.swt.events.*;import org.eclipse.swt.graphics.*;import org.eclipse.swt.layout.*;import org.eclipse.swt.program.*;import org.eclipse.swt.widgets.*;import java.io.*;import java.text.*;import java.util.*;/** * File Viewer example */public class FileViewer {  	private static ResourceBundle resourceBundle = ResourceBundle.getBundle("examples_fileviewer");	private final static String DRIVE_A = "a:" + File.separator;	private final static String DRIVE_B = "b:" + File.separator;	/* UI elements */ 		private Display display; 	private Shell shell;	private ToolBar toolBar;	private Label numObjectsLabel;	private Label diskSpaceLabel;		private File currentDirectory = null;	private boolean initial = true;		/* Drag and drop optimizations */	private boolean isDragging = false; // if this app is dragging	private boolean isDropping = false; // if this app is dropping	private File[]  processedDropFiles = null; // so Drag only deletes what it needs to	private File[]  deferredRefreshFiles = null;      // to defer notifyRefreshFiles while we do DND	private boolean deferredRefreshRequested = false; // to defer notifyRefreshFiles while we do DND	private ProgressDialog progressDialog = null; // progress dialog for locally-initiated operations	/* Combo view */	private static final String COMBODATA_ROOTS = "Combo.roots";		// File[]: Array of files whose paths are currently displayed in the combo	private static final String COMBODATA_LASTTEXT = "Combo.lastText";		// String: Previous selection text string	private Combo combo;	/* Tree view */	private IconCache iconCache = new IconCache();	private static final String TREEITEMDATA_FILE = "TreeItem.file";		// File: File associated with tree item	private static final String TREEITEMDATA_IMAGEEXPANDED = "TreeItem.imageExpanded";		// Image: shown when item is expanded	private static final String TREEITEMDATA_IMAGECOLLAPSED = "TreeItem.imageCollapsed";		// Image: shown when item is collapsed	private static final String TREEITEMDATA_STUB = "TreeItem.stub";		// Object: if not present or null then the item has not been populated	private Tree tree;	private Label treeScopeLabel;	/* Table view */	private static final DateFormat dateFormat = DateFormat.getDateTimeInstance(		DateFormat.MEDIUM, DateFormat.MEDIUM);	private static final String TABLEITEMDATA_FILE = "TableItem.file";		// File: File associated with table row	private static final String TABLEDATA_DIR = "Table.dir";		// File: Currently visible directory	private static final int[] tableWidths = new int[] {150, 60, 75, 150};	private final String[] tableTitles = new String [] {		FileViewer.getResourceString("table.Name.title"),		FileViewer.getResourceString("table.Size.title"),		FileViewer.getResourceString("table.Type.title"),		FileViewer.getResourceString("table.Modified.title")	};	private Table table;	private Label tableContentsOfLabel;	/* Table update worker */	// Control data	private final Object workerLock = new Object();		// Lock for all worker control data and state	private volatile Thread  workerThread = null;		// The worker's thread	private volatile boolean workerStopped = false;		// True if the worker must exit on completion of the current cycle	private volatile boolean workerCancelled = false;		// True if the worker must cancel its operations prematurely perhaps due to a state update	// Worker state information -- this is what gets synchronized by an update	private volatile File workerStateDir = null;	// State information to use for the next cycle	private volatile File workerNextDir = null;	/* Simulate only flag */	// when true, disables actual filesystem manipulations and outputs results to standard out	private boolean simulateOnly = true;	/**	 * Runs main program.	 */	public static void main (String [] args) {		Display display = new Display ();		FileViewer application = new FileViewer();		Shell shell = application.open(display);		while (! shell.isDisposed()) {			if (! display.readAndDispatch()) display.sleep();		}		application.close();		display.dispose();		System.out.println("OS:"+System.getProperty("os.name"));	}	/**	 * Opens the main program.	 */	public Shell open(Display display) {				// Create the window		this.display = display;		iconCache.initResources(display);		shell = new Shell();		createShellContents();		notifyRefreshFiles(null);		shell.open();		return shell;	}	/**	 * Closes the main program.	 */	void close() {		workerStop();		iconCache.freeResources();	}		/**	 * Returns a string from the resource bundle.	 * We don't want to crash because of a missing String.	 * Returns the key if not found.	 */	static String getResourceString(String key) {		try {			return resourceBundle.getString(key);		} catch (MissingResourceException e) {			return key;		} catch (NullPointerException e) {			return "!" + key + "!";		}				}	/**	 * Returns a string from the resource bundle and binds it	 * with the given arguments. If the key is not found,	 * return the key.	 */	static String getResourceString(String key, Object[] args) {		try {			return MessageFormat.format(getResourceString(key), args);		} catch (MissingResourceException e) {			return key;		} catch (NullPointerException e) {			return "!" + key + "!";		}	}	/**	 * Construct the UI	 * 	 * @param container the ShellContainer managing the Shell we are rendering inside	 */	private void createShellContents() {		shell.setText(getResourceString("Title", new Object[] { "" }));			shell.setImage(iconCache.stockImages[iconCache.shellIcon]);		Menu bar = new Menu(shell, SWT.BAR);		shell.setMenuBar(bar);		createFileMenu(bar);		createHelpMenu(bar);		GridLayout gridLayout = new GridLayout();		gridLayout.numColumns = 3;		gridLayout.marginHeight = gridLayout.marginWidth = 0;		shell.setLayout(gridLayout);		GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);		gridData.widthHint = 185;		createComboView(shell, gridData);		gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);		gridData.horizontalSpan = 2;		createToolBar(shell, gridData);		SashForm sashForm = new SashForm(shell, SWT.NONE);		sashForm.setOrientation(SWT.HORIZONTAL);		gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL);		gridData.horizontalSpan = 3;		sashForm.setLayoutData(gridData);		createTreeView(sashForm);		createTableView(sashForm);		sashForm.setWeights(new int[] { 2, 5 });		numObjectsLabel = new Label(shell, SWT.BORDER);		gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);		gridData.widthHint = 185;		numObjectsLabel.setLayoutData(gridData);				diskSpaceLabel = new Label(shell, SWT.BORDER);		gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);		gridData.horizontalSpan = 2;		diskSpaceLabel.setLayoutData(gridData);	}		/**	 * Creates the File Menu.	 * 	 * @param parent the parent menu	 */	private void createFileMenu(Menu parent) {		Menu menu = new Menu(parent);		MenuItem header = new MenuItem(parent, SWT.CASCADE);		header.setText(getResourceString("menu.File.text"));		header.setMenu(menu);		final MenuItem simulateItem = new MenuItem(menu, SWT.CHECK);		simulateItem.setText(getResourceString("menu.File.SimulateOnly.text"));		simulateItem.setSelection(simulateOnly);		simulateItem.addSelectionListener(new SelectionAdapter () {			public void widgetSelected(SelectionEvent e) {				simulateOnly = simulateItem.getSelection();			}		});		MenuItem item = new MenuItem(menu, SWT.PUSH);		item.setText(getResourceString("menu.File.Close.text"));		item.addSelectionListener(new SelectionAdapter () {			public void widgetSelected(SelectionEvent e) {				shell.close();			}		});	}		/**	 * Creates the Help Menu.	 * 	 * @param parent the parent menu	 */	private void createHelpMenu(Menu parent) {		Menu menu = new Menu(parent);		MenuItem header = new MenuItem(parent, SWT.CASCADE);		header.setText(getResourceString("menu.Help.text"));		header.setMenu(menu);		MenuItem item = new MenuItem(menu, SWT.PUSH);		item.setText(getResourceString("menu.Help.About.text"));				item.addSelectionListener(new SelectionAdapter () {			public void widgetSelected(SelectionEvent e) {				MessageBox box = new MessageBox(shell, SWT.ICON_INFORMATION | SWT.OK);				box.setText(getResourceString("dialog.About.title"));				box.setMessage(getResourceString("dialog.About.description",					new Object[] { System.getProperty("os.name") }));				box.open();			}		});	}	/**	 * Creates the toolbar	 * 	 * @param shell the shell on which to attach the toolbar	 * @param layoutData the layout data	 */	private void createToolBar(final Shell shell, Object layoutData) {		toolBar = new ToolBar(shell, SWT.NULL);		toolBar.setLayoutData(layoutData);		ToolItem item = new ToolItem(toolBar, SWT.SEPARATOR);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdParent]);		item.setToolTipText(getResourceString("tool.Parent.tiptext"));		item.addSelectionListener(new SelectionAdapter () {			public void widgetSelected(SelectionEvent e) {				doParent();			}		});		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdRefresh]);		item.setToolTipText(getResourceString("tool.Refresh.tiptext"));		item.addSelectionListener(new SelectionAdapter () {			public void widgetSelected(SelectionEvent e) {				doRefresh();			}		});		SelectionAdapter unimplementedListener = new SelectionAdapter() {			public void widgetSelected(SelectionEvent e) {				MessageBox box = new MessageBox(shell, SWT.ICON_INFORMATION | SWT.OK);				box.setText(getResourceString("dialog.NotImplemented.title"));				box.setMessage(getResourceString("dialog.ActionNotImplemented.description"));				box.open();			}		};		item = new ToolItem(toolBar, SWT.SEPARATOR);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdCut]);		item.setToolTipText(getResourceString("tool.Cut.tiptext"));		item.addSelectionListener(unimplementedListener);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdCopy]);		item.setToolTipText(getResourceString("tool.Copy.tiptext"));		item.addSelectionListener(unimplementedListener);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdPaste]);		item.setToolTipText(getResourceString("tool.Paste.tiptext"));		item.addSelectionListener(unimplementedListener);		item = new ToolItem(toolBar, SWT.SEPARATOR);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdDelete]);		item.setToolTipText(getResourceString("tool.Delete.tiptext"));		item.addSelectionListener(unimplementedListener);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdRename]);		item.setToolTipText(getResourceString("tool.Rename.tiptext"));		item.addSelectionListener(unimplementedListener);		item = new ToolItem(toolBar, SWT.SEPARATOR);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdSearch]);		item.setToolTipText(getResourceString("tool.Search.tiptext"));		item.addSelectionListener(unimplementedListener);		item = new ToolItem(toolBar, SWT.PUSH);		item.setImage(iconCache.stockImages[iconCache.cmdPrint]);		item.setToolTipText(getResourceString("tool.Print.tiptext"));		item.addSelectionListener(unimplementedListener);	}	/**	 * Creates the combo box view.	 * 	 * @param parent the parent control	 */	private void createComboView(Composite parent, Object layoutData) {		combo = new Combo(parent, SWT.NONE);		combo.setLayoutData(layoutData);		combo.addSelectionListener(new SelectionAdapter() {			public void widgetSelected(SelectionEvent e) {				final File[] roots = (File[]) combo.getData(COMBODATA_ROOTS);				if (roots == null) return;				int selection = combo.getSelectionIndex();				if (selection >= 0 && selection < roots.length) {					notifySelectedDirectory(roots[selection]);				}			}			public void widgetDefaultSelected(SelectionEvent e) {				final String lastText = (String) combo.getData(COMBODATA_LASTTEXT);				String text = combo.getText();				if (text == null) return;				if (lastText != null && lastText.equals(text)) return;				combo.setData(COMBODATA_LASTTEXT, text);				notifySelectedDirectory(new File(text));			}		});	}	/**	 * Creates the file tree view.	 * 	 * @param parent the parent control	 */	private void createTreeView(Composite parent) {		Composite composite = new Composite(parent, SWT.NONE);		GridLayout gridLayout = new GridLayout();		gridLayout.numColumns = 1;		gridLayout.marginHeight = gridLayout.marginWidth = 2;		gridLayout.horizontalSpacing = gridLayout.verticalSpacing = 0;		composite.setLayout(gridLayout);		treeScopeLabel = new Label(composite, SWT.BORDER);		treeScopeLabel.setText(FileViewer.getResourceString("details.AllFolders.text"));		treeScopeLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL));		tree = new Tree(composite, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.SINGLE);		tree.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL));		tree.addSelectionListener(new SelectionListener() {			public void widgetSelected(SelectionEvent event) {				final TreeItem[] selection = tree.getSelection();				if (selection != null && selection.length != 0) {					TreeItem item = selection[0];					File file = (File) item.getData(TREEITEMDATA_FILE);									notifySelectedDirectory(file);				}			}			public void widgetDefaultSelected(SelectionEvent event) {				final TreeItem[] selection = tree.getSelection();				if (selection != null && selection.length != 0) {					TreeItem item = selection[0];					item.setExpanded(true);					treeExpandItem(item);				}			}		});		tree.addTreeListener(new TreeAdapter() {			public void treeExpanded(TreeEvent event) {				final TreeItem item = (TreeItem) event.item;				final Image image = (Image) item.getData(TREEITEMDATA_IMAGEEXPANDED);				if (image != null) item.setImage(image);				treeExpandItem(item);			}			public void treeCollapsed(TreeEvent event) {				final TreeItem item = (TreeItem) event.item;				final Image image = (Image) item.getData(TREEITEMDATA_IMAGECOLLAPSED);				if (image != null) item.setImage(image);			}		});