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

    }


    /* Specially treat News-State */
    if (field.getId() == INews.STATE) {
      final StateConditionControl stateConditionControl = new StateConditionControl(inputField, SWT.NONE, null);
      stateConditionControl.addListener(SWT.Modify, new Listener() {
        public void handleEvent(Event event) {
          fInputValue = stateConditionControl.getSelection();


          if (fInputValue == null && input != null || (fInputValue != null && !fInputValue.equals(input)))
            fModified = true;
        }
      });


      /* Pre-Select input if given */
      Object presetInput = (input == null) ? fInputValue : input;
      if (presetInput != null && presetInput instanceof EnumSet)
        stateConditionControl.select((EnumSet<State>) presetInput);


      /* Update Input Value */
      fInputValue = stateConditionControl.getSelection();
    }


    /* Create new Input Field based on search-value-type */
    else {
      switch (field.getSearchValueType().getId()) {


        /* Type: Boolean */
        case ISearchValueType.BOOLEAN: {
          final Combo combo = new Combo(inputField, SWT.BORDER | SWT.READ_ONLY);
          combo.add("true");
          combo.add("false");
          combo.addListener(SWT.Modify, new Listener() {
            public void handleEvent(Event event) {
              fInputValue = Boolean.valueOf(combo.getItem(combo.getSelectionIndex()));


              if (!fInputValue.equals(input))
                fModified = true;
            }
          });


          /* Pre-Select input if given */
          Object presetInput = (input == null) ? fInputValue : input;
          if (presetInput != null && presetInput instanceof Boolean)
            combo.select(((Boolean) presetInput) ? 0 : 1);
          else
            combo.select(0);


          /* Update Input Value */
          fInputValue = Boolean.valueOf(combo.getItem(combo.getSelectionIndex()));


          break;
        }


          /* Type: Date / Time */
        case ISearchValueType.DATE:
        case ISearchValueType.TIME:
        case ISearchValueType.DATETIME: {
          final Calendar cal = Calendar.getInstance();
          final DateTime datetime = new DateTime(inputField, SWT.DATE);
          datetime.addListener(SWT.Selection, new Listener() {
            public void handleEvent(Event event) {
              cal.set(Calendar.DATE, datetime.getDay());
              cal.set(Calendar.MONTH, datetime.getMonth());
              cal.set(Calendar.YEAR, datetime.getYear());


              fInputValue = cal.getTime();


              if (!fInputValue.equals(input))
                fModified = true;
            }
          });


          /* Pre-Select input if given */
          Object presetInput = (input == null) ? fInputValue : input;
          if (presetInput != null && presetInput instanceof Date)
            cal.setTime((Date) presetInput);


          datetime.setDay(cal.get(Calendar.DATE));
          datetime.setMonth(cal.get(Calendar.MONTH));
          datetime.setYear(cal.get(Calendar.YEAR));


          /* Update Input Value */
          fInputValue = cal.getTime();


          break;
        }


          /* Type: Enumeration */
        case ISearchValueType.ENUM: {
          final Text text = new Text(inputField, SWT.BORDER);
          text.addListener(SWT.Modify, new Listener() {
            public void handleEvent(Event event) {
              fInputValue = text.getText();


              if (!fInputValue.equals(input))
                fModified = true;
            }
          });


          /* Provide Auto-Complete Field */
          hookAutoComplete(text, field.getSearchValueType().getEnumValues());


          /* Pre-Select input if given */
          String inputValue = (input != null ? input.toString() : null);
          if (inputValue != null)
            text.setText(inputValue);


          /* Update Input Value */
          fInputValue = text.getText();


          break;
        }


          /* Type: Number */
        case ISearchValueType.NUMBER:
        case ISearchValueType.INTEGER: {
          final Spinner spinner = new Spinner(inputField, SWT.BORDER);
          spinner.setMinimum(0);
          spinner.setMaximum(1000);
          spinner.addListener(SWT.Modify, new Listener() {
            public void handleEvent(Event event) {
              fInputValue = spinner.getSelection();


              if (!fInputValue.equals(input))
                fModified = true;
            }
          });


          /* Pre-Select input if given */
          Object presetInput = (input == null) ? fInputValue : input;
          if (presetInput != null && presetInput instanceof Integer)
            spinner.setSelection((Integer) presetInput);


          /* Update Input Value */
          fInputValue = spinner.getSelection();


          break;
        }


          /* Type: String */
        case ISearchValueType.STRING:
        case ISearchValueType.LINK: {
          final Text text = new Text(inputField, SWT.BORDER);
          text.addListener(SWT.Modify, new Listener() {
            public void handleEvent(Event event) {
              fInputValue = text.getText();


              if (!fInputValue.equals(input))
                fModified = true;

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    fViewer.setContentProvider(contentProvider);


    /* Create LabelProvider (Custom Owner Drawn enabled!) */
    final NewsTableLabelProvider newsTableLabelProvider = new NewsTableLabelProvider(fViewer);
    if (USE_CUSTOM_OWNER_DRAWN) {
      fViewer.getControl().addListener(SWT.EraseItem, new Listener() {
        public void handleEvent(Event event) {
          Object element = event.item.getData();
          newsTableLabelProvider.erase(event, element);
        }
      });

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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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    /* LabelProvider */
    final SummaryLabelProvider summaryLabelProvider = new SummaryLabelProvider();
    fViewer.setLabelProvider(summaryLabelProvider);


    /* Custom Owner Drawn Category */
    fViewer.getControl().addListener(SWT.EraseItem, new Listener() {
      public void handleEvent(Event event) {
        Object element = event.item.getData();
        if (element instanceof CleanUpGroup)
          summaryLabelProvider.eraseGroup(event);
      }

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    fResultViewer.setContentProvider(getContentProvider());


    /* Create LabelProvider (Custom Owner Drawn enabled!) */
    final NewsTableLabelProvider newsTableLabelProvider = new ScoredNewsLabelProvider(fResultViewer);
    if (USE_CUSTOM_OWNER_DRAWN) {
      fResultViewer.getControl().addListener(SWT.EraseItem, new Listener() {
        public void handleEvent(Event event) {
          Object element = event.item.getData();
          newsTableLabelProvider.erase(event, element);
        }
      });

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        onMouseDoubleClick(event);
      }
    });


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


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

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          onNavPrevious();
      }
    });


    /* Close Shell once deactivated and not incoming automatic */
    fShell.addListener(SWT.Deactivate, new Listener() {
      public void handleEvent(Event event) {
        if (fMode != Mode.INCOMING_AUTOMATIC && fGlobalScope.getBoolean(DefaultPreferences.CLOSE_NOTIFIER_ON_OPEN))
          doClose();
      }
    });

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    addButton.setToolTipText(Messages.NewsActionList_ADD_ACTION);


    /* Add Menu */
    final Menu actionMenu = new Menu(buttonBar);
    createActionMenu(actionMenu, 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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          moveToTray(shell);
      }
    });


    /* Hook into Selection Listeners to open Activiy Dialog if needed (this is a hack :-) ) */
    shell.getDisplay().addFilter(SWT.Selection, new Listener() {
      @SuppressWarnings("restriction")
      public void handleEvent(Event event) {
        if (event.item == null && event.widget instanceof ToolItem) {
          ToolItem item = (ToolItem) event.widget;
          ToolBar toolbar = item.getParent();

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      }
    };
    shell.addShellListener(fTrayShellListener);


    /* Show Menu on Selection */
    fTrayItem.addListener(SWT.MenuDetect, new Listener() {
      public void handleEvent(Event event) {
        showTrayMenu(shell);
      }
    });


    /* Handle Selection (Default and Normal) */
    Listener selectionListener = new Listener() {
      private long lastDoubleClickTime;


      public void handleEvent(Event event) {
        boolean restoreOnDoubleclick = fPreferences.getBoolean(DefaultPreferences.RESTORE_TRAY_DOUBLECLICK);
        boolean isDoubleClick = (event.type == SWT.DefaultSelection);

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