Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 122)

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CHAPTER 3

Views

3-38 Using Views

Each of the three return values contains three elements:

■ Element 0: the subview that is highlighted. This subview is usually

clParagraphView, but you need to check to make sure. A

clPolygonView is not returned here even if HiliteOwner returns a

clEditView when a clPolygonView child is highlighted.

■ Element 1: the start position of the text found in the text slot of a

clParagraphView.

■ Element 2: the end position of the text found in the text slot of a

clParagraphView.

To verify that your view is a

clParagraphView, check the viewClass slot of

the view. The value returned (dynamically) sometimes has a high bit set so you

need to take it into consideration using a mask constant,

vcClassMask:

theviews.viewClass=clParagraphView OR

theView.viewClass - vcClassMask=clParagraphView

BAnd(thViews.viewClass, BNot(vcClassMask))=clParagraphView

If a graphic is highlighted and HiliteOwner returns a clEditView, check its

view children for non-

nil values of the 'hilites slot (the 'hilites slot is for

use in any view but its contents are private).

Complex View Effects 3

If you have an application that uses ViewQuitScript in numerous places, your

view may close immediately, but to the user the Newton may appear to be hung

during the long calculations. A way to avoid this is to have the view appear open

until the close completes.

You can accomplish this effect in one of two ways. First, put your code in

ViewHideScript instead of ViewCloseScript. Second, remove the view’s

ViewEffect and manually force the effect at the end of ViewQuitScript

using the

Effect method.

Making Modal Views 3

A modal view is one that primarily restricts the user to interacting with that view.

All taps outside the modal view are ignored while the modal view is open.

In the interest of good user interface design, you should avoid using modal views

unless they are absolutely necessary. However, there are occasions when you may

need one.

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Apple Newton Utilities Guide de l'utilisateur Page 122

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