Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 107)

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CHAPTER 3

Views

About Views 3-23

Opening and Closing Animation Effects 3

Another attribute of a view that you can specify is an animation that occurs when

the view is opened or closed on the screen. If an effect is deﬁned for a view, it occurs

whenever the view is sent an

Open, Close, Show, Hide, or Toggle message.

Use the

viewEffect slot to give the view an opening or closing animation.

Alternately, you can perform one-time effects on a view by sending it one of these

view messages:

Effect, SlideEffect, RevealEffect, or Delete. These

methods are described in “Animating Views” (page 3-40).

The

viewEffect slot speciﬁes an animation that occurs when a view is shown or

hidden. If this slot is not present, the view will not animate at these times. There

are several predeﬁned animation types. You can also create a custom effect using a

combination of

viewEffect ﬂags from Table 2-7 (page 2-86) in Newton

Programmer’s Reference. To use one of the predeﬁned animation types, specify the

number of animation steps, the time per step, and the animation type, with the

following values:

fxSteps(

x) In x specify the number of steps you want, from 1 to 15.

fxStepTime(

x) In x specify the number of ticks that you want each step to

take, from zero to 15 (there are 60 ticks per second).

Specify one of the following values to select the type of animation effect desired:

■ fxCheckerboardEffect—reveals a view using a checkerboard effect, where

adjoining squares move in opposite (up and down) directions.

■ fxBarnDoorOpenEffect—reveals a view from center towards left and right

edges, like a barn door opening where the view is the inside of the barn.

■ fxBarnDoorCloseEffect—reveals a view from left and right edges towards

the center, like a barn door closing where the view is painted on the doors.

■ fxVenetianBlindsEffect—reveals a view so that it appears behind

venetian blinds that open.

■ fxIrisOpenEffect—changes the size of an invisible “aperture” covering the

view, revealing an ever-increasing portion of the full-size view as the aperture

opens.

■ fxIrisCloseEffect—like fxIrisOpenEffect, except that it decreases

the size of an invisible “aperture” covering the view, as the aperture closes.

■ fxPopDownEffect—reveals a view as it slides down from its top boundary.

■ fxDrawerEffect—reveals a view as it slides up from its bottom boundary.

■ fxZoomOpenEffect—expands the image of the view from a point in the

center until it ﬁlls the screen; that is, the entire view appears to grow from a

point in the center of the screen.

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