Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 232)

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CHAPTER 6

Pickers, Pop-up Views, and Overviews

6-32 Overview Protos

// NOTE: returns the edit slip that is opened

GetLayout("editor.t"):new(tapInfo.nameRef,

tapInfo.editPaths, why, self, 'EditDone, context);

else

begin

// the item is valid, so just toggle the selection

context:Tapped('toggle);

nil; // Return <nil>.

end;..

end;

The example above assumes that the base view of the layout editor.t has a New

method that opens the editor and returns the associated view.

The editor can be designed to ﬁt your data. However, we suggest that you use a

protoFloatNGo that is attached to the root view using BuildContext. You are

also likely to need a callback to the

pickderDef so it can appropriately update

the edited or new item. Finally, your editor needs to update your data soup using an

Xmit soup method so that the list picker updates.

In the

OpenEditor example above, the last three arguments are used by the editor

to send a callback to the

pickerDef from the viewQuitScript. The design of

the callback function is up to you. Here is an example:

pickerDef.EditDone := func(nameRef, context)

begin

local valid = :Validate(tapInfo.nameRef, tapInfo.editPaths) ;

if (Length(valid) > 0) then

begin

// Something failed. Try and revert back to original

if NOT :ValidatePager(nameRef) AND

self.('[pathExpr: savedPagerValue, nameRef]) = nameRef then

nameRef.pager := savedPagerValue.pager;

context:Tapped(nil);// Remove the checkmark

end;

else

// The nameRef is valid, so select it.

context:Tapped('select);

// Clear the saved value for next time.

savedPagerValue := nil;

end;

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Apple Newton Utilities Guide de l'utilisateur Page 232

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