Handling Events : StyledText Event « SWT « Java Tutorial

When users type, delete from, cut from, or paste to a StyledText, four events fire:

  1. key verification,
  2. verification,
  3. modification, and
  4. extended modification.

Before the StyledText allows the changes to itself, It first processes the key verification and the verification. These handlers, VerifyKeyListeners and VerifyListeners, can allow, veto, or alter the requested text change. After the change has happened, ModifyListeners and ExtendedModifyListeners react to the changes.

17.45.StyledText Event
17.45.1.Handling Events
17.45.2.Filtering Change with VerifyKeyListenersFiltering Change with VerifyKeyListeners
17.45.3.Allow backspace and deleteAllow backspace and delete
17.45.4.Allow Arrow Key
17.45.5.Allow return
17.45.6.After all VerifyKeyListeners are notified, any VerifyListeners are then notified.
17.45.7.Print out VerifyEvent detail
17.45.8.Against cut-and-paste: Modify the data in VerifyEvent to change the effect of user's keystrokes
17.45.9.Veto the event by setting its doit member to false.
17.45.10.Reacting to Change
17.45.11.Add Paint event listener to StyledTextAdd Paint event listener to StyledText
17.45.12.Use a verify listener in StyledTextUse a verify listener in StyledText
17.45.13.Add Paint Object ListenerAdd Paint Object Listener
17.45.14.Dragging text in a StyledText widgetDragging text in a StyledText widget
17.45.15.Use ExtendedModifyEvent