Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 123)

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CHAPTER 3

Views

Using Views 3-39

Typically, modal views are used for slips. For example, if the user was going to

delete some data in your application, you might want to display a slip asking them

to conﬁrm or cancel the operation. The slip would prevent them from going to

another operation until they provide an answer.

Use

AsyncConfirm to create and display a slip that the user must dismiss before

continuing. The slip is created at a deferred time, so the call to

AsyncConfirm

returns immediately, allowing the currently executing NewtonScript code to ﬁnish.

You can also use

ModalConfirm but this method causes a separate OS task to be

created and doesn’t return until after the slip is closed. It is less efﬁcient and takes

more system overhead.

Once you’ve created a modal view, you can use the

FilterDialog or

ModalDialog to open it. Using FilterDialog is the preferred method as it

returns immediately. As with

ModalConfirm, ModalDialog causes a separate

OS task to be created.

Finding the Bounds of Views 3

The following functions and view methods calculate and return a viewBounds

frame.

Run-time functions:

■ RelBounds— calculates the right and bottom values of a view and returns a

bounds frame.

■ SetBounds—returns a frame when the left, top, right, and bottom coordinates

are given.

■ GlobalBox—returns the rectangle, in coordinates, of a specified view.

■ GlobalOuterBox—returns the rectangle, in coordinates, of a specified view

including any frame that is drawn around a view.

■ LocalBox—returns a frame containing the view bounds relative to the view itself.

■ MoveBehind— moves a view behind another view.

■ DirtyBox— marks a portion of a view as needing redrawing.

■ GetDrawBox— returns the bounds of an area on the screen that needs redrawing.

Compile-time functions:

■ ButtonBounds—returns a frame when supplied with the width of a button to

be placed in the status bar.

■ PictBounds— finds the width and height of a picture and returns the proper

bounds frame.

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