[1913] in java-interest
Porting Jonathan Paynes' widget class to beta
daemon@ATHENA.MIT.EDU (Robert Lum)
Tue Sep 19 21:25:58 1995
From: Robert Lum <lum@pharaoh.sphinx.com>
To: java-interest@java.Eng.Sun.COM, hotjava-interest@java.Eng.Sun.COM
Date: Tue, 19 Sep 1995 13:39:18 -0700 (PDT)
For those who may be using Jonathan Paynes' widget class, the following
information about porting to Java Beta release may by helpful.
1) First, remove any constructors for the class and instead replace them
with and Init method. The class for the applet should be derived from the
Applet class (if it was previously derived from AppComponent for example).
2) The method addNotify should be removed as it overides the definition earlier
in the class heirachy for the Applet class. Instead, move the former
body of the addNotify method into the Init method. Thus, in extending the
applet to have subcomponents which are themselves components, the nofication
occurs in the initialisation of the class/applet. The add method still works
in Applet class and can be used to add components in the init method for the class one is porting.
3) The classes AppText, AppLabel, AppCheck, (or names to that effect) in JP's
library are replaced by the corresponding classes TextField, Label and
CheckBox in the Beta release. Generally the widget mapping is one to one
between JP's widgets and the Beta widgets. Care has to be take that the
Beta widgets have different constructors.
4) Finally, the Action method that one previously used to handle events has
to be changed to take an extra argument. Where previously one had
public void Action(AppCheckbox at),
this becomes
public Boolean Action(Event e, Checkbox at).
This is because Applet class has an Action method already for event handling.
5) Note that some methods where previously returned void now return boolean.
In this case the return value should be set to true.
Hope this helps,
Robert
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