Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 77)

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CHAPTER 2

Getting Started

Package Loading, Activation, and Deactivation 2-5

when it is moved to another store (it is deactivated then reactivated), or when the

user deletes the application icon in the Extras Drawer. Packages can also be

deactivated without removing them from the store.

When a package is removed as a result of the user deleting it from the Extras

Drawer, the system also executes the

DeletionScript function in each of the

package frame parts. This occurs before the

RemoveScript function is executed.

The following sections describe how to use these functions.

Loading 2

The DoNotInstallScript function in a package part is executed when a

package is ﬁrst loaded onto a Newton store from some external source (this does

not include inserting a storage card containing the package or moving it between

stores). This function applies to all types of frame parts (for example, not store parts).

This method gives the parts in the package a chance to prevent installation of the

entire package. If any of the package parts returns a non-

nil value from this

function, the package is not installed and is discarded.

You should provide the user with some kind of feedback if package installation is

prevented, rather than silently failing. For example, to ensure that a package is

installed only on the internal store you could write a

DoNotInstallScript

function like the following:

func()

begin

if GetStores()[0] <> GetVBOStore(ObjectPkgRef('foo)) then

begin

GetRoot():Notify(kNotifyAlert, kAppName,

"This package was not installed.

It can be installed only onto the internal store.");

true;

end;

end

Activation 2

The InstallScript function in a package part is executed when an application

or auto part is activated on the Newton or whenever the Newton is reset.

This function lets you perform any special installation operations that you need to

do, any initialization, and any registration for system services.

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Apple Newton Utilities Guide de l'utilisateur Page 77

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