Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 581)

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101

CHAPTER 15

Filing

Using the Filing Service 15-15

declare your folder tab view to the application’s base view. The system sets the

folder tab view’s bounds for you at run time, positioning the folder tab relative to

its parent, near the top of the screen.

Customizing Folder Tab Views 15

The protoNewFolderTab proto supplies a child view named title that images

a string that you may supply optionally. To display your own string as the title text

in a

protoNewFolderTab view, use the global function SetValue to set the

value of the

text slot in the title view child of your folder tab view.

For example,

SetValue(myNewFolderTab.title, 'text, "My text");

▲

W ARNING

Do not create a title slot in any folder tab view. Do not replace

the title text in a

protoClockFolderTab view. ▲

Deﬁning a TitleClickScript Method 15

The folder tab view’s TitleClickScript method is invoked when the user taps

the title text in a

protoNewFolderTab view or the time displayed as title text in

protoClockFolderTab view. The default TitleClickScript method

provided for

protoNewFolderTab views does nothing. The default

TitleClickScript method provided by the protoClockFolderTab view

displays the built-in Clock application.

You can provide your own

TitleClickScript method to customize the action

your folder tab views take when the user taps them.

Implementing the FileThis Method 15

When the user taps the File button in the Filing slip, the system sends the

FileThis message to the target view. Your FileThis method must perform any

actions necessary to ﬁle the target and redraw the current display appropriately.

For example, if your application is displaying an overview list of unﬁled items

when it receives this message, your

FileThis method needs to redraw the list

without the newly ﬁled item in it, providing the user-interface illusion that the item

has been moved.

Your

FileThis method must also handle the case in which the user re-ﬁles an

item in the category under which it already resides. In this case, the appropriate

response is to do nothing; unnecessarily redrawing views that have not changed

makes the screen appear to ﬂicker or ﬂash. Because the value of the target’s

labels slot does not change unless you change it, you can test this slot’s current

value to determine whether the new value is different.

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