Apple Newton Utilities User's Guide download pdf (Page 711)

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CHAPTER 19

Built-in Applications and System Data

Auxiliary Buttons 19-37

Figure 19-9 The Notes application with and without an auxiliary button

Using Auxiliary Buttons 19

You can add buttons to the status bars or other locations in the Notes and Names

applications. Your application may also use this mechanism to allow itself to be

extended.

RegAuxButton and UnRegAuxButton are the functions that add and remove a

button from the auxiliary button registry; they are called by button providers.

Button providers can ignore the descriptions of the other functions, which are

called by button hosts.

Here is an example of registering a button with the Notes application:

RegAuxButton('|smileButton:PIEDTS|,

{destApp: 'paperroll,// Add buttons to Notes

_proto: protoTextButton,

text: "Smile!",

viewBounds: RelBounds(0,0,40,10),

buttonClickScript: func() print("Cheese!")

});

This code added the auxiliary button shown in Figure 19-9.

The following code shows how this button should be removed:

UnRegAuxButton('|smileButton:PIEDTS|);

You should be careful what assumptions you make about the environment where

the button will appear. The buttons may not be on a

protoStatusBar or have a

base slot available by inheritance, and the implementation details of the built-in

applications may well change in the future. Remember to check your assumptions

and catch exceptions.

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