Apple Newton Utilities Guía de usuario descargar pdf (Pagina 231)

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CHAPTER 6

Pickers, Pop-up Views, and Overviews

Overview Protos 6-31

Validation and Editing in protoListPicker 6

The built-in validation mechanism is not designed to deal with nested soup

information. In general, you gain more ﬂexibility by not using a

validationFrame in your pickerDef, even if you have no nested entries.

Instead, you can provide your own validation mechanism and editors:

■ deﬁne a Validate method in your picker deﬁnition

■ deﬁne an OpenEditor method in your picker deﬁnition

■ draw a layout for each editor you require

Here is how your

Validate method should work. The following example

assumes that pickerDef.ValidateName and pickerDef.ValidatePager have

been implemented:

pickerDef.Validate := func(nameRef, pathArray)

begin

// keep track of any paths that fail

local failedPaths := [];

for each index, path in pathArray do

begin

if path = 'name then

begin

// check if name validation fails

if NOT :ValidateName(nameRef) then

// if so, add it to array of failures

AddArraySlot(failedPaths, path);

end;

else begin

if NOT :ValidatePager(nameRef) then

AddArraySlot(failedPaths, path);

end;

// return failed paths or empty array

failedPaths;

end;

Here is how your OpenEditor method should work:

pickerDef.OpenEditor := func(tapInfo, context, why)

begin

local valid = :Validate(tapInfo.nameRef,

tapInfo.editPaths) ;

if (Length(valid) > 0) then

// if not valid, open the editor

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