Examples of org.eclipse.swt.widgets.ScrollBar.addSelectionListener()

org.eclipse.swt.widgets.ScrollBar.addSelectionListener()
Adds the listener to the collection of listeners who will be notified when the user changes the receiver's value, by sending it one of the messages defined in the SelectionListener interface.
When widgetSelected is called, the event object detail field contains one of the following values: SWT.NONE - for the end of a drag. SWT.DRAG. SWT.HOME. SWT.END. SWT.ARROW_DOWN. SWT.ARROW_UP. SWT.PAGE_DOWN. SWT.PAGE_UP. widgetDefaultSelected is not called.
@param listener the listener which should be notified when the user changes the receiver's value @exception IllegalArgumentException
- ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
- ERROR_WIDGET_DISPOSED - if the receiver has been disposed
- ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
@see SelectionListener @see #removeSelectionListener @see SelectionEvent


    /* Initalize the scrollbar and register listeners. */
    private void initScrollBars() {
        final ScrollBar horizontal = getHorizontalBar();
        horizontal.setEnabled(false);
        horizontal.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent event) {
                scrollHorizontally((ScrollBar) event.widget);
            }
        });

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                scrollHorizontally((ScrollBar) event.widget);
            }
        });
        final ScrollBar vertical = getVerticalBar();
        vertical.setEnabled(false);
        vertical.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent event) {
                scrollVertically((ScrollBar) event.widget);
            }
        });

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    // Darstellung der Images.
    canvasImage = new Canvas(inputFieldsComposite, SWT.V_SCROLL);
    canvasImage.addPaintListener(this);
    canvasImage.addMouseListener(this);
    ScrollBar vBar = canvasImage.getVerticalBar();
    vBar.addSelectionListener(this);
    int vBarWidth = vBar.getSize().x;
    FormData fd = new FormData();
    fd.top = new FormAttachment(0, 0);
    fd.bottom = new FormAttachment(100, 0);
    fd.right = new FormAttachment(100, 0);

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      tree.addMouseListener(theMouseAdapter);
      tree.addKeyListener(keyListener);
      ScrollBar hBar = tree.getHorizontalBar();
      if (hBar != null) {
        hBar.addSelectionListener(selectionListener);
      }
      ScrollBar vBar = tree.getVerticalBar();
      if (vBar != null) {
        vBar.addSelectionListener(selectionListener);
      }

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      if (hBar != null) {
        hBar.addSelectionListener(selectionListener);
      }
      ScrollBar vBar = tree.getVerticalBar();
      if (vBar != null) {
        vBar.addSelectionListener(selectionListener);
      }
    }


    public boolean isCellEditorActive() {
      return cellEditorState != null;

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        fSubjectControl.addKeyListener(this);
        if (fSubjectControl instanceof Scrollable) {
          Scrollable scrollable= (Scrollable) fSubjectControl;
          ScrollBar vBar= scrollable.getVerticalBar();
          if (vBar != null)
            vBar.addSelectionListener(this);
          ScrollBar hBar= scrollable.getHorizontalBar();
          if (hBar != null)
            hBar.addSelectionListener(this);
        }

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          ScrollBar vBar= scrollable.getVerticalBar();
          if (vBar != null)
            vBar.addSelectionListener(this);
          ScrollBar hBar= scrollable.getHorizontalBar();
          if (hBar != null)
            hBar.addSelectionListener(this);
        }
        
        fDisplay= fSubjectControl.getDisplay();
        if (!fDisplay.isDisposed()) {
          fDisplay.addFilter(SWT.Activate, this);

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  /* Initalize the scrollbar and register listeners. */
  private void initScrollBars() {
    ScrollBar horizontal = getHorizontalBar();
    horizontal.setEnabled(false);
    horizontal.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        scrollHorizontally((ScrollBar) event.widget);
      }
    });
    ScrollBar vertical = getVerticalBar();

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        scrollHorizontally((ScrollBar) event.widget);
      }
    });
    ScrollBar vertical = getVerticalBar();
    vertical.setEnabled(false);
    vertical.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        scrollVertically((ScrollBar) event.widget);
      }
    });
  }

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  //TODO: 垂直滚动条也应该用自定控件，否则太那看了 :-(
  ScrollBar bar = shell.getVerticalBar();
  if (bar != null)
  {
      bar.addSelectionListener(new SelectionAdapter()
      {
    public void widgetSelected(SelectionEvent event)
    {
        scrollVertical((ScrollBar) event.widget);
    }

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