Apple Newton Utilities User's Guide download pdf (Page 115)

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101

CHAPTER 3

Views

About Views 3-31

New Alignment Flags 3

The viewJustify slot contains new constants that allow you to specify that a

view is sized proportionally to its sibling or parent view, both horizontally and/or

vertically.

A change to the way existing

viewJustify constants work is that when you are

using sibling-relative alignment, the ﬁrst sibling uses the parent alignment settings

(since it has no sibling to which to justify itself).

Changes to Existing Functions and Methods 3

The following changes have been made to existing functions and methods for 2.0.

■ RemoveStepView. This function now removes the view template from the

stepChildren array of the parent view. You do not need to remove the

template yourself.

■ SetValue. You can now use this global function to change the recognition

behavior of a view at run time by setting new recognition ﬂags in the

viewFlags slot. The new recognition behavior takes effect immediately

following the

SetValue call.

■ GlobalBox. This method now works properly when called from the

ViewSetupFormScript method of a view. If called from the

ViewSetupFormScript method, GlobalBox gets the viewBounds and

ViewJustify slots from the view, calculates the effects of the sibling and

parent alignment on the view bounds, and then returns the resulting bounds

frame in global coordinates.

■ LocalBox. This method now works properly when called from

the

ViewSetupFormScript method of a view. If called from the

ViewSetupFormScript method, LocalBox gets the viewBounds and

ViewJustify slots from the view, calculates the effects of the sibling and

parent alignment on the view bounds, and then returns the resulting bounds

frame in local coordinates.

■ ViewQuitScript. When this message is sent to a view, it propagates down to

child views of that view. In system software version 1.0, the order in which child

views received this message and were closed was undeﬁned.

In system software version 2.0, the order in which this message is sent to

child views is top-down. Also, each view has the option of having

ViewPostQuitScript called in child-first order. The return value of

the

ViewQuitScript method determines whether or not the

ViewPostQuitScript message is sent.

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