SWT change error

Question

I am using SWT and found a problem.

When selecting and unchecking the boxes and maximizing the window, this will cause the icon of the first button to be set, even if it is zero. Also, the layout of the text on the buttons may be incorrect.

To recreate the error:

• Select checkbox 1
• Deselect checkbox 1
• Select 3
• Maximize window

The icon for flag 1 must be zero (blank), but instead it has a cross icon.

  public static void main(String[] args) {
       final Display d = new Display();
       Shell s = new Shell(d);
       s.setLayout(new GridLayout(2, false));
       s.setSize(500, 500);

       new Label(s, SWT.NONE).setText("C");
       final Button c = new Button(s, SWT.CHECK);

       new Label(s, SWT.NONE).setText("L1");
       final Button b = new Button(s, SWT.PUSH | SWT.FLAT);
       b.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
       b.setText("Button 1");
       b.setEnabled(false);

       new Label(s, SWT.NONE).setText("C2");
       final Button c2 = new Button(s, SWT.CHECK);

       new Label(s, SWT.NONE).setText("L2");
       final Button b2 = new Button(s, SWT.PUSH | SWT.FLAT);
       b2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
       b2.setImage(null);
       b2.setText("Button 2");
       b2.setEnabled(false);

       new Label(s, SWT.NONE).setText("C3");
       final Button c3 = new Button(s, SWT.CHECK);

       new Label(s, SWT.NONE).setText("L3");
       final Button b3 = new Button(s, SWT.PUSH | SWT.FLAT);
       b3.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
       b3.setText("Button 3");
       b3.setEnabled(false);

       c.addSelectionListener(new SelectionAdapter() {
           @Override
           public void widgetSelected(SelectionEvent e) {
               if (!b.isEnabled()) {
                   b.setImage(d.getSystemImage(SWT.ICON_ERROR));
                   b.setEnabled(true);
               } else {
                   b.setImage(null);
                   b.setEnabled(false);
               }
           }
       });

       c2.addSelectionListener(new SelectionAdapter() {
           @Override
           public void widgetSelected(SelectionEvent e) {
               if (!b2.isEnabled()) {
                   b2.setImage(d.getSystemImage(SWT.ICON_ERROR));
                   b2.setEnabled(true);
               } else {
                   b2.setImage(null);
                   b2.setEnabled(false);
               }
           }
       });

       c3.addSelectionListener(new SelectionAdapter() {
           @Override
           public void widgetSelected(SelectionEvent e) {
               if (!b3.isEnabled()) {
                   b3.setImage(d.getSystemImage(SWT.ICON_ERROR));
                   b3.setEnabled(true);
               } else {
                   b3.setImage(null);
                   b3.setEnabled(false);
               }
           }
       });

       s.open();
       while (!s.isDisposed()) {
           if (!d.readAndDispatch())
               d.sleep();
       }
       d.dispose();
   }

Answer 1

, , Button StackLayout Button Button. , / Image. , Button .

:

public static class MyButton {

    private final Button buttonEnabled;
    private final Button buttonDisabled;

    private final Composite stackComposite;
    private final StackLayout stackLayout;

    public MyButton(final Composite parent, final String text) {
        stackComposite = new Composite(parent, SWT.NONE);
        stackLayout = new StackLayout();
        stackComposite.setLayout(stackLayout);
        stackComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));

        buttonEnabled = createButton(stackComposite, text, true);
        buttonDisabled = createButton(stackComposite, text, false);

        stackLayout.topControl = buttonEnabled;
    }

    public void setEnabled(final boolean enabled) {
        stackLayout.topControl = enabled ? buttonEnabled : buttonDisabled;
        stackComposite.layout();
    }

    public boolean isEnabled() {
        return stackLayout.topControl.equals(buttonEnabled) ? true : false;
    }

    private static Button createButton(final Composite parent,
            final String text, final boolean enabled) {
        final Button button = new Button(parent, SWT.PUSH | SWT.FLAT);
        button.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        button.setText(text);
        button.setEnabled(enabled);
        if (enabled) {
            button.setImage(parent.getDisplay().getSystemImage(SWT.ICON_ERROR));
        }
        return button;
    }

}

, , (addListener(...) ..) MyButton Button, .

main:

public static void main(final String[] args) {

    // ...

    new Label(s, SWT.NONE).setText("C");
    final Button c = new Button(s, SWT.CHECK);

    new Label(s, SWT.NONE).setText("L1");
    final MyButton b = new MyButton(s, "Button 1");

    // ...

    c.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(final SelectionEvent e) {
            b.setEnabled(!b.isEnabled());
        }
    });

    // ...

}

: ( , )