Examples of org.eclipse.swt.widgets.Listener

org.eclipse.swt.widgets.Listener
Implementers of Listener provide a simple handleEvent() method that is used internally by SWT to dispatch events.
After creating an instance of a class that implements this interface it can be added to a widget using the addListener(int eventType, Listener handler) method and removed using the removeListener (int eventType, Listener handler) method. When the specified event occurs, handleEvent(...) will be sent to the instance.

Classes which implement this interface are described within SWT as providing the untyped listener API. Typically, widgets will also provide a higher-level typed listener API, that is based on the standard java.util.EventListener pattern.

Note that, since all internal SWT event dispatching is based on untyped listeners, it is simple to build subsets of SWT for use on memory constrained, small footprint devices, by removing the classes and methods which implement the typed listener API.
@see Widget#addListener @see java.util.EventListener @see org.eclipse.swt.events

   * @param parent
   * @param style
   */
  public CTree(Composite parent, int style) {
    fTree = new Tree(parent, style);
    parent.addListener(SWT.Resize, new Listener() {
      public void handleEvent(Event event) {
        onTreeResize();
      }
    });
  }

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      }
    };
    fViewer.addPostSelectionChangedListener(fSelectionChangeListener);


    /* Perform Action on Mouse-Down */
    fCustomTree.getControl().addListener(SWT.MouseDown, new Listener() {
      public void handleEvent(Event event) {
        onMouseDown(event);
      }
    });


    /* Update Cursor on Mouse-Move */
    fCustomTree.getControl().addListener(SWT.MouseMove, new Listener() {
      public void handleEvent(Event event) {
        onMouseMove(event);
      }
    });

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   * @param parent
   * @param style
   */
  public CTable(Composite parent, int style) {
    fTable = new Table(parent, style);
    parent.addListener(SWT.Resize, new Listener() {
      public void handleEvent(Event event) {
        onTableResize();
      }
    });
  }

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    addButton.setToolTipText(Messages.SearchConditionList_ADD_CONDITION);


    /* Add Menu */
    final Menu conditionMenu = new Menu(buttonBar);
    createConditionMenu(conditionMenu, item);
    addButton.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        if (event.detail == SWT.ARROW) {
          Rectangle rect = item.getBounds();
          Point pt = new Point(rect.x, rect.y + rect.height);
          pt = buttonBar.toDisplay(pt);

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    createColorMenu();


    fColorItem = new ToolItem(fBar, SWT.DROP_DOWN);
    fColorItem.setImage(createColorImage(fSelectedColor));
    fColorItem.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        Rectangle rect = fColorItem.getBounds();
        Point pt = new Point(rect.x, rect.y + rect.height);
        pt = fBar.toDisplay(pt);
        fColorMenu.setLocation(pt.x, pt.y);

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    /* Create LabelProvider (Custom Owner Drawn enabled!) */
    NewsColumnViewModel columnModel = createColumnModel(fEditorInput.getMark());
    fNewsTableLabelProvider = new NewsTableLabelProvider(columnModel);
    if (!OwlUI.isHighContrast()) {
      fViewer.getControl().addListener(SWT.EraseItem, new Listener() {
        public void handleEvent(Event event) {
          Object element = event.item.getData();
          fNewsTableLabelProvider.erase(event, element);
        }
      });

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          saveColumnModelInBackground();
        }
      });


      /* Listen to moved columns */
      column.addListener(SWT.Move, new Listener() {
        public void handleEvent(Event event) {
          if (fCustomTree.getControl().isDisposed() || fBlockColumMoveEvent)
            return;


          int[] columnOrder = fCustomTree.getControl().getColumnOrder();

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      }
    };
    fViewer.addSelectionChangedListener(fSelectionChangeListener);


    /* Perform Action on Mouse-Down */
    fCustomTree.getControl().addListener(SWT.MouseDown, new Listener() {
      public void handleEvent(Event event) {
        onMouseDown(event);
      }
    });


    /* Perform Action on Mouse-Up */
    fCustomTree.getControl().addListener(SWT.MouseUp, new Listener() {
      public void handleEvent(Event event) {
        onMouseUp(event);
      }
    });


    /* Update Cursor on Mouse-Move */
    fCustomTree.getControl().addListener(SWT.MouseMove, new Listener() {
      public void handleEvent(Event event) {
        onMouseMove(event);
      }
    });

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    fFolderChooser = new FolderChooser(folderContainer, rootFolders.iterator().next(), null, SWT.BORDER, true, 5);
    fFolderChooser.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    fFolderChooser.setExpandStrategy(ExpandStrategy.PACK);
    fFolderChooser.setLayout(LayoutUtils.createGridLayout(1, 0, 0, 2, 5, false));
    fFolderChooser.setBackground(container.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
    fFolderChooser.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        if (!fChooseExistingRadio.getSelection()) {
          fChooseExistingRadio.setSelection(true);
          fNoSpecificLocationRadio.setSelection(false);
          fCreateNewSetRadio.setSelection(false);

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    fItemViewer.getTable().setFocus();
    fItemViewer.getTable().setData(ApplicationWorkbenchWindowAdvisor.FOCUSLESS_SCROLL_HOOK, new Object());


    /* Custom Owner Drawn Category */
    if (!OwlUI.isHighContrast()) {
      fItemViewer.getControl().addListener(SWT.EraseItem, new Listener() {
        public void handleEvent(Event event) {
          ToolBarItem item = (ToolBarItem) event.item.getData();
          if (item.item == CoolBarItem.SEPARATOR) {
            Scrollable scrollable = (Scrollable) event.widget;
            GC gc = event.gc;

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