Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 274)

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CHAPTER 7

Controls and Other Protos

7-14 Time Protos

ChangedSlider: func()

begin

SetVolume(viewValue);

:SysBeep();

end,

...}

The example above initializes the slider gauge to indicate the current system

volume, which it retrieves from the user conﬁguration that is maintained by the

Newton System Software. The range of allowable volume values is from

(the default for

minValue) to 4.

Whenever the user moves the slider and lifts the pen, the

viewValue slot is

updated and the

ChangedSlider method is called. In the example, the

ChangedSlider method resets the system volume to the new value chosen by

the user and sounds a beep to provide the user with audible feedback.

For more information on the

protoSlider and the ChangedSlider method,

see “protoSlider” (page 6-33) in Newton Programmer’s Reference.

Time Protos 7

You can use the time protos to allow the user to set time and date values. There are

four time protos:

■ The protoDigitalClock time proto displays a digital clock with which the

user can set a time value. For more information about the slots and methods for

this proto, see “protoDigitalClock” (page 6-38) in Newton Programmer’s

Reference. Figure 7-21 shows an example of a

protoDigitalClock view.

Figure 7-21 A protoDigitalClock view

■ The protoNewSetClock time proto displays an analog clock with which the

user can set a time value. For more information about the slots and methods for

this proto, see “protoNewSetClock” (page 6-40) in Newton Programmer’s

Reference. Figure 7-22 shows an example of a

protoNewSetClock view.

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