Handling Events : StyledText Event « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. StyledText Event

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 VerifyKeyListeners
	17.45.3.	Allow 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 StyledText
	17.45.12.	Use a verify listener in StyledText
	17.45.13.	Add Paint Object Listener
	17.45.14.	Dragging text in a StyledText widget
	17.45.15.	Use ExtendedModifyEvent