Apple Newton Utilities Guia do Utilizador descarregar pdf (Página 148)

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CHAPTER 4

NewtApp Applications

4-10 About the NewtApp Framework

data which they format appropriately. For example, the number views

(

newtNumberView and newtRONumberView) format number data (according to

the value of a

format slot you set).

The labelled input-line slot view protos provide you with a label, which you may

specify, for the input line. Additionally, the label may include a picker (pop-up menu).

These views also format a particular kind of data. To do this they use a special

NewtApp object known as a ﬁlter to specify a value for the

flavor slot of the

labelled input-line slot views.

The ﬁlter object essentially acts as a translator between the target data frame (or

more typically, a slot in that frame) and the text ﬁeld visible to the user. For

example, in the

newtDateInputLine proto, a ﬁlter translates the time from a

time-in-minutes value to a string, which is displayed. The ﬁlter then translates the

string back to a time-in-minutes value, which is saved in the soup.

You can create custom ﬁlters by basing them on the proto

newtFilter or on the

other ﬁlters documented in Table 3-1 (page 3-60) in the Newton Programmer’s

Reference. You can also create custom labelled input-line slot views. See the example

in “Creating a Custom Labelled Input-Line Slot View,” beginning on page 4-24.

You can have your label input-line protos remember a list of recent items. To do so,

all you need do is assign a symbol to the

'memory slot of your template. This

symbol must incorporate your developer signature. The system automatically

maintains the list of recent items for your input line. To use the list, you need to

use the same symbol with the

AddMemoryItem, AddMemoryItemUnique,

GetMemoryItems, and GetMemorySlot functions, which are described in

Chapter 26, “Utility Functions.”

In addition, one special slot view, called the

newtSmartNameView proto, allows

the user to choose a name from the soup belonging to the built-in Names application.

It adds the pop-up menu item, Other, to the picker; when the user chooses Other

from the

newtSmartNameView proto, it displays the names in the Names

application soup in a system-provided people picker.

After you choose a name and close the view displaying the Names soup, that

name is displayed on the input line. The name is also put into the Picker menu.

newtSmartNameView proto is shown in Figure 4-6.

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