Demonstrates CheckboxTableViewer : Table « SWT JFace Eclipse « Java

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Java » SWT JFace Eclipse » TableScreenshots 
Demonstrates CheckboxTableViewer
Demonstrates CheckboxTableViewer

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.eclipse.jface.viewers.CheckboxTableViewer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * This class demonstrates CheckboxTableViewer. It allows you to check files to
 * copy, and copy them to a backup directory.
 */
public class BackupFiles extends ApplicationWindow {
  // Used to show status
  private Label status;

  /**
   * BackupFiles constructor
   */
  public BackupFiles() {
    super(null);
  }

  /**
   * Runs the application
   */
  public void run() {
    // Don't return from open() until window closes
    setBlockOnOpen(true);

    // Open the main window
    open();

    // Dispose the display
    Display.getCurrent().dispose();
  }

  /**
   * Configures the shell
   
   @param shell
   *            the shell
   */
  protected void configureShell(Shell shell) {
    super.configureShell(shell);

    // Set the title bar text and the size
    shell.setText("Backup Files");
    shell.setSize(400400);
  }

  /**
   * Creates the main window's contents
   
   @param parent
   *            the main window
   @return Control
   */
  protected Control createContents(Composite parent) {
    Composite composite = new Composite(parent, SWT.NONE);
    composite.setLayout(new GridLayout(1false));

    // Create the source directory panel and its controls
    final Text sourceDir = createFilePanelHelper(composite, "Source Dir:");

    // Create the CheckboxTableViewer to display the files in the source dir
    final CheckboxTableViewer ctv = CheckboxTableViewer.newCheckList(
        composite, SWT.BORDER);
    ctv.getTable().setLayoutData(new GridData(GridData.FILL_BOTH));
    ctv.setContentProvider(new BackupFilesContentProvider());
    ctv.setLabelProvider(new BackupFilesLabelProvider());

    // Create the destination directory panel and its controls
    final Text destDir = createFilePanelHelper(composite, "Dest Dir:");

    // Create the Copy button
    Button copy = new Button(composite, SWT.PUSH);
    copy.setText("Copy");

    // Create the status field
    status = new Label(composite, SWT.NONE);
    status.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

    // When the source directory changes, change the input for the viewer
    sourceDir.addModifyListener(new ModifyListener() {
      public void modifyText(ModifyEvent event) {
        ctv.setInput(((Textevent.widget).getText());
      }
    });

    // When copy is pressed, copy the files
    copy.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        // Get the checked elements
        Object[] files = ctv.getCheckedElements();
        if (files.length > 0) {
          // Some files are checked; make sure we have a valid
          // destination
          File dest = new File(destDir.getText());
          if (dest.isDirectory()) {
            // Go through each file
            for (int i = 0, n = files.length; i < n; i++) {
              copyFile((Filefiles[i], dest);
            }
          else
            showMessage("You must select a valid destination directory");
        else
          showMessage("You must select some files to copy");
      }
    });

    return composite;
  }

  /**
   * Helper method to create the label/text/button for a directory
   
   @param composite
   *            the parent composite
   @param label
   *            the text for the label
   @return Text
   */
  private Text createFilePanelHelper(Composite composite, String label) {
    // Create the composite to hold the controls
    Composite panel = new Composite(composite, SWT.BORDER);
    panel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    panel.setLayout(new GridLayout(3false));

    // Create the controls
    new Label(panel, SWT.LEFT).setText(label);
    Text text = new Text(panel, SWT.BORDER);
    text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    Button browse = new Button(panel, SWT.PUSH);

    // Add browsing
    browse.setText("...");
    browse.addSelectionListener(new DirectoryBrowser(text));

    // Return the Text that holds the directory
    return text;
  }

  /**
   * Copies a file
   
   @param file
   *            the file to copy
   @param targetDir
   *            the directory to copy to
   */
  private void copyFile(File file, File targetDir) {
    BufferedInputStream in = null;
    BufferedOutputStream out = null;
    File destFile = new File(targetDir.getAbsolutePath() + File.separator
        + file.getName());
    try {
      showMessage("Copying " + file.getName());
      in = new BufferedInputStream(new FileInputStream(file));
      out = new BufferedOutputStream(new FileOutputStream(destFile));
      int n;
      while ((n = in.read()) != -1) {
        out.write(n);
      }
      showMessage("Copied " + file.getName());
    catch (Exception e) {
      showMessage("Cannot copy file " + file.getAbsolutePath());
    finally {
      if (in != null)
        try {
          in.close();
        catch (Exception e) {
        }
      if (out != null)
        try {
          out.close();
        catch (Exception e) {
        }
    }
  }

  /**
   * Shows a message
   
   @param message
   *            the message
   */
  private void showMessage(String message) {
    status.setText(message);
  }

  /**
   * The application entry point
   
   @param args
   *            the command line arguments
   */
  public static void main(String[] args) {
    new BackupFiles().run();
  }
}

/**
 * This class returns the files in the specified directory. If the specified
 * directory doesn't exist, it returns an empty array.
 */

class BackupFilesContentProvider implements IStructuredContentProvider {
  private static final Object[] EMPTY = new Object[] {};

  /**
   * Gets the files in the specified directory
   
   @param arg0
   *            a String containing the directory
   */
  public Object[] getElements(Object arg0) {
    File file = new File((Stringarg0);
    if (file.isDirectory()) {
      return file.listFiles(new FileFilter() {
        public boolean accept(File pathName) {
          // Ignore directories; return only files
          return pathName.isFile();
        }
      });
    }
    return EMPTY;
  }

  /**
   * Disposes any created resources
   */
  public void dispose() {
    // Nothing to dispose
  }

  /**
   * Called when the input changes
   */
  public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
    // Nothing to do
  }
}

/**
 * This class provides the labels for files
 */

class BackupFilesLabelProvider implements ILabelProvider {
  /**
   * Returns the image
   
   @param arg0
   *            the file
   @return Image
   */
  public Image getImage(Object arg0) {
    return null;
  }

  /**
   * Returns the name of the file
   
   @param arg0
   *            the name of the file
   @return String
   */
  public String getText(Object arg0) {
    return ((Filearg0).getName();
  }

  /**
   * Adds a listener
   
   @param arg0
   *            the listener
   */
  public void addListener(ILabelProviderListener arg0) {
    // Throw it away
  }

  /**
   * Disposes any created resources
   */
  public void dispose() {
    // Nothing to dispose
  }

  /**
   * Returns whether changing this property for this element affects the label
   
   @param arg0
   *            the element
   @param arg1
   *            the property
   */
  public boolean isLabelProperty(Object arg0, String arg1) {
    return false;
  }

  /**
   * Removes a listener
   
   @param arg0
   *            the listener
   */
  public void removeListener(ILabelProviderListener arg0) {
    // Ignore
  }
}

/**
 * This class allows users to browse for a directory
 */

class DirectoryBrowser extends SelectionAdapter {
  // The Text this browser is tied to
  private Text text;

  /**
   * DirectoryBrowser constructor
   
   @param text
   */
  public DirectoryBrowser(Text text) {
    this.text = text;
  }

  /**
   * Called when the browse button is pushed
   
   @param event
   *            the generated event
   */
  public void widgetSelected(SelectionEvent event) {
    DirectoryDialog dlg = new DirectoryDialog(Display.getCurrent()
        .getActiveShell());
    dlg.setFilterPath(text.getText());
    String dir = dlg.open();
    if (dir != null) {
      text.setText(dir);
    }
  }
}

           
       
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