Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 229)

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CHAPTER 6

Pickers, Pop-up Views, and Overviews

Overview Protos 6-29

The picker deﬁnition (described in the next section) is a data deﬁnition frame that

is provides the routines to create a name reference from an entry, an entry alias,

another name reference, a straight frame, or just to create a canonical empty name

reference (if no data is provided). It also retrieves the data from a name reference.

Finally, it provides some information about the name reference to support actions

like tapping and highlighting.

You also need to deﬁne the soup to query. Both this and the query speciﬁcation can

be deﬁned either in the data deﬁnition or in the list picker.

Using the Data Deﬁnitions Frame in a List Picker 6

The pickerDef slot of the list picker holds a data deﬁnition frame that determines

the overall behavior of the list picker. This frame should be based on

protoNameRefDataDef or protoPeopleDataDef, or at should least support

the required slots.

Here is an example:

pickerDef:= {

_proto: protoNameRefDataDef,

name: "Widgets",

class: '|nameRef.widget|,

entryType: 'widget,

soupToQuery:"Widgets",

querySpec: {indexPath: 'name},

columns: kColumns,

};

Specifying Columns 6

The columns slot hold an array that determines how the columns in the list picker

are displayed. Here’s an example of column speciﬁcation array:

columns:= [{

fieldPath:'name,// path for field to display in column

optional:true,// not required -- unnamed widget

tapWidth:155},// width for checkbox & name combined

{

fieldPath:'price,// path for field to display

in column

optional:nil,// price is required

tapWidth:0}];// width -- to right end of view

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Apple Newton Utilities Guide de l'utilisateur Page 229

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