Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 208)

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CHAPTER 6

Pickers, Pop-up Views, and Overviews

6-8 Map Pickers

The protoGeneralPopup sends a pickCancelledScript to the

callbackContext specified in the New method. However, it does not send a

pickActionScript back; instead, it sends an Affirmative message to itself.

You supply the method and decide what call to make to the context and what

information to send back.

To put other objects in the

protoGeneralPopup, just drag them out in NTK. For

example, if you want a checkbox in your pop-up view, drag out a

protoCheckbox. You can put anything in the pop-up view, including your

own protos.

Since you have to assemble the information to send on an afﬁrmative, you will

likely end up declaring your content to the general pop-up.

The only slots you really need to set are

Affirmative and viewBounds.

Affirmative is a function. Here’s an example:

func()

begin

// Notify the context that the user has accepted the

// changes made in the popup

if context then

context:?pickActionScript(changeData) ;

end

Map Pickers 6

You can use the pickers described in this section to display maps and allow the user

to select countries, U.S. states, Canadian provinces, and cities. The Newton system

software provides the following map picker protos:

■ The protoCountryPicker displays a map of the world. When the user taps a

country, the

PickWorld message is sent to your view. For information about

the slots and methods for this picker, see “protoCountryPicker” (page 5-30) in

Newton Programmer’s Reference. Figure 6-8 shows an example of a

protoCountryPicker.

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