Source Code : navigate a SWT table cells with arrow keys

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navigate a SWT table cells with arrow keys

/*
 * TableCursor example snippet: navigate a table cells with arrow keys. 
 * Edit when user hits Return key.  Exit edit mode by hitting Escape (cancels edit)
 * or Return (applies edit to table).
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ControlEditor;
import org.eclipse.swt.custom.TableCursor;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;

public class Snippet96 {

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout());

    // create a a table with 3 columns and fill with data
    final Table table = new Table(shell, SWT.BORDER | SWT.MULTI
        | SWT.FULL_SELECTION);
    table.setLayoutData(new GridData(GridData.FILL_BOTH));
    TableColumn column1 = new TableColumn(table, SWT.NONE);
    TableColumn column2 = new TableColumn(table, SWT.NONE);
    TableColumn column3 = new TableColumn(table, SWT.NONE);
    for (int i = 0; i < 100; i++) {
      TableItem item = new TableItem(table, SWT.NONE);
      item.setText(new String[] { "cell " + i + " 0", "cell " + i + " 1",
          "cell " + i + " 2" });
    }
    column1.pack();
    column2.pack();
    column3.pack();

    // create a TableCursor to navigate around the table
    final TableCursor cursor = new TableCursor(table, SWT.NONE);
    // create an editor to edit the cell when the user hits "ENTER"
    // while over a cell in the table
    final ControlEditor editor = new ControlEditor(cursor);
    editor.grabHorizontal = true;
    editor.grabVertical = true;

    cursor.addSelectionListener(new SelectionAdapter() {
      // when the TableEditor is over a cell, select the corresponding row
      // in
      // the table
      public void widgetSelected(SelectionEvent e) {
        table.setSelection(new TableItem[] { cursor.getRow() });
      }

      // when the user hits "ENTER" in the TableCursor, pop up a text
      // editor so that
      // they can change the text of the cell
      public void widgetDefaultSelected(SelectionEvent e) {
        final Text text = new Text(cursor, SWT.NONE);
        TableItem row = cursor.getRow();
        int column = cursor.getColumn();
        text.setText(row.getText(column));
        text.addKeyListener(new KeyAdapter() {
          public void keyPressed(KeyEvent e) {
            // close the text editor and copy the data over
            // when the user hits "ENTER"
            if (e.character == SWT.CR) {
              TableItem row = cursor.getRow();
              int column = cursor.getColumn();
              row.setText(column, text.getText());
              text.dispose();
            }
            // close the text editor when the user hits "ESC"
            if (e.character == SWT.ESC) {
              text.dispose();
            }
          }
        });
        editor.setEditor(text);
        text.setFocus();
      }
    });
    // Hide the TableCursor when the user hits the "CTRL" or "SHIFT" key.
    // This alows the user to select multiple items in the table.
    cursor.addKeyListener(new KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        if (e.keyCode == SWT.CTRL || e.keyCode == SWT.SHIFT
            || (e.stateMask & SWT.CONTROL) != 0
            || (e.stateMask & SWT.SHIFT) != 0) {
          cursor.setVisible(false);
        }
      }
    });
    // Show the TableCursor when the user releases the "SHIFT" or "CTRL"
    // key.
    // This signals the end of the multiple selection task.
    table.addKeyListener(new KeyAdapter() {
      public void keyReleased(KeyEvent e) {
        if (e.keyCode == SWT.CONTROL && (e.stateMask & SWT.SHIFT) != 0)
          return;
        if (e.keyCode == SWT.SHIFT && (e.stateMask & SWT.CONTROL) != 0)
          return;
        if (e.keyCode != SWT.CONTROL
            && (e.stateMask & SWT.CONTROL) != 0)
          return;
        if (e.keyCode != SWT.SHIFT && (e.stateMask & SWT.SHIFT) != 0)
          return;

        TableItem[] selection = table.getSelection();
        TableItem row = (selection.length == 0) ? table.getItem(table
            .getTopIndex()) : selection[0];
        table.showItem(row);
        cursor.setSelection(row, 0);
        cursor.setVisible(true);
        cursor.setFocus();
      }
    });

    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}


           
       

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