SWT Code -FileDialog,DirectoryDialog and multi-lined text field

Search for files with specified extension

Learn  how to use FileDialog,DirectoryDialog and multi-lined text field in SWT using Grid layout

/*

 *  program to get the file with specified extension.

 *

 * Description: If we gave directory path and extension of file , we will be able to select files with that specified extension

 */

import org.eclipse.swt.SWT;

import org.eclipse.swt.layout.*;

import org.eclipse.swt.widgets.*;

public class FileSearchForExtension {

       Display display = new Display();

       Shell shell = new Shell(display);

       Text text;

       String selectedDir;

       Label label;

       Text text1, fileNameText;

       String fileFilterPath = "";

       StringBuilder sb = new StringBuilder("");

       public FileSearchForExtension() {

              init();

              shell.pack();

              shell.setSize(450, 300); // setting size of the shell

              shell.open();

              while (!shell.isDisposed()) {

                     if (!display.readAndDispatch()) {

                           display.sleep();

                     }

              }

              display.dispose();

       }

       private void init() {

              shell.setText("File Searcher for Extension");

              GridLayout gridLayout = new GridLayout();

              gridLayout.numColumns = 2;

              gridLayout.makeColumnsEqualWidth = true;

              shell.setLayout(gridLayout);

              GridData data = new GridData(GridData.FILL_BOTH);

              // UI design 

              // Directory selection button and text box

              Button button = new Button(shell, SWT.PUSH);

              button.setText("Select a directory");

              text = new Text(shell, SWT.NONE);

              text.setLayoutData(data);

              // Enter extension manually

              label = new Label(shell, SWT.BORDER | SWT.WRAP);

              label.setText("Enter the extension to search");

              text1 = new Text(shell, SWT.NONE);

              text1.setLayoutData(data);

              // Multiple/single file name selection button and text box

              Button buttonSelectFile = new Button(shell, SWT.PUSH);

              buttonSelectFile.setText("Select a file/multiple files names");

              fileNameText = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.WRAP

                           | SWT.V_SCROLL);

              fileNameText.setLayoutData(data);

              Button buttonClear = new Button(shell, SWT.PUSH);

              buttonClear.setText("clear fileds");

              GridData gridData = new GridData();

              gridData.horizontalAlignment = GridData.CENTER;

              gridData.horizontalSpan = 2;

              buttonClear.setLayoutData(gridData);

              // Adding listner for directory selection using directory dialog

              button.addListener(SWT.Selection, new Listener() {

                     public void handleEvent(Event event) {

                           DirectoryDialog directoryDialog = new DirectoryDialog(shell);

                           directoryDialog.setFilterPath(selectedDir);

                           directoryDialog

                                         .setMessage("Please select a directory and click OK");

                           String dir = directoryDialog.open();

                           if (dir != null) {

                                  text.setText(dir);

                                  text.setEditable(true);

                                  selectedDir = dir;

                           }

                     }

              });

              // adding listener to file names selection using file dialog

              buttonSelectFile.addListener(SWT.Selection, new Listener() {

                     public void handleEvent(Event event) {

                           FileDialog fileDialog = new FileDialog(shell, SWT.MULTI);

                           fileDialog.setFilterPath(text.getText());

                           String extension = text1.getText();

                           fileDialog

                                         .setFilterExtensions(new String[] { "*." + extension });

                           String firstFile = fileDialog.open();

                           if (firstFile != null) {

                                  fileFilterPath = fileDialog.getFilterPath();

                                  String[] selectedFiles = fileDialog.getFileNames();

                                  for (int i = 0; i < selectedFiles.length; i++) {

                                         sb.append(selectedFiles[i] + "\n");

                                  }

                                  fileNameText.setText(sb.toString());

                           }

                     }

              });

              // Adding listener to the clear button

              buttonClear.addListener(SWT.Selection, new Listener() {

                     public void handleEvent(Event event) {

                           text.setText("");

                           text1.setText("");

                           fileNameText.setText("");

                           sb.setLength(0);

                     }

              });

       }

       public static void main(String[] args) {

              new FileSearchForExtension();

       }

}