Description Rutger Ovidius 2006-03-25 00:47:33 EST

SWT Win32 CVS

In the following snippet, the Table receives a ton of Erase/Measure/PaintItem events as you move the mouse over top of it (or move another window on top of this Shell), while the Tree does not receive any.

I don't know which is correct, nor how to correctly use these events yet, but it seemed inconsistent.


 public static void main(String[] args) {
    final Display display = new Display();

    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final int columns = 3;
    final int itemCount = 10;
    final int colWidth = 175;

    // --
    final Tree tree = new Tree(shell, SWT.BORDER | SWT.VIRTUAL | SWT.FULL_SELECTION | SWT.MULTI);
    tree.setHeaderVisible(true);
    tree.setLinesVisible(true);
    for (int i = 0; i < columns; i++) {
      TreeColumn tc = new TreeColumn(tree, SWT.LEFT);
      tc.setText(i + " " + tc.toString());
      tc.setWidth(colWidth);
      tc.setMoveable(true);
    }

    tree.setSortDirection(SWT.DOWN);
    tree.setSortColumn(tree.getColumn(0));
    tree.setItemCount(itemCount);

    tree.addListener(SWT.SetData, new Listener() {
      public void handleEvent(Event event) {
        System.err.println("SetData:\tIndex: " + event.index + " Item: " + event.item + " Event: " + event);
        TreeItem item = (TreeItem) event.item;
        String text = String.valueOf(event.index);
        for (int i = 0; i <= columns; i++) {
          item.setText(i, text + i + " " + item.toString());
        }
      }
    });

    // --
    final Table table = new Table(shell, SWT.BORDER | SWT.VIRTUAL | SWT.FULL_SELECTION | SWT.MULTI);
    table.setHeaderVisible(true);
    table.setLinesVisible(true);

    for (int i = 0; i < columns; i++) {
      TableColumn tc = new TableColumn(table, SWT.LEFT);
      tc.setText(i + " " + tc.toString());
      tc.setWidth(colWidth);
      tc.setMoveable(true);
    }

    table.setSortDirection(SWT.DOWN);
    table.setSortColumn(table.getColumn(0));
    table.setItemCount(itemCount);

    table.addListener(SWT.SetData, new Listener() {
      public void handleEvent(Event event) {
        System.err.println("SetData:\tIndex: " + event.index + " Item: " + event.item + " Event: " + event);
        TableItem item = (TableItem) event.item;
        String text = String.valueOf(event.index);
        for (int i = 0; i <= columns; i++) {
          item.setText(i, text + " " + item.toString());
        }
      }
    });

    // --
    Listener l = new Listener() {
      public void handleEvent(Event event) {
        String eventName = "";
        switch (event.type) {
          case SWT.MeasureItem :
            eventName = "MeasureItem";
            break;
          case SWT.EraseItem :
            eventName = "EraseItem";
            break;
          case SWT.PaintItem :
            eventName = "PaintItem";
            break;
        }

        System.err.println(eventName + "\tIndex: " + event.index + " Item: " + event.item + " Event: "
            + event);
      }
    };

    tree.addListener(SWT.MeasureItem, l);
    tree.addListener(SWT.EraseItem, l);
    tree.addListener(SWT.PaintItem, l);

    table.addListener(SWT.MeasureItem, l);
    table.addListener(SWT.EraseItem, l);
    table.addListener(SWT.PaintItem, l);

    shell.setSize(800, 600);
    shell.open();

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