Apple Newton Utilities User's Guide download pdf (Page 328)

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101

CHAPTER 8

Text and Ink Input and Display

8-36 Using Text

Key dimensions are speciﬁed by summing a combination of horizontal and vertical

key unit constants within the

keyDescriptor. For example, to specify a key that

is 2 3/4 units wide by 1 1/2 units high, specify these constants for

keyDescriptor:

keyHUnit*2 + keyHQuarter*3 + keyVUnit + keyVHalf

Using the Keyboard Registry 8

If your application includes its own keyboard, you need to register it with the system

keyboard registry. This makes it possible for the system to call any keyboard-related

functions that you have deﬁned and to handle the insertion caret properly.

The

RegisterOpenKeyboard method of a view is for registering a keyboard for

use with that view.

Use the

UnregisterOpenKeyboard method of a view to remove the keyboard

view from the registry. If the insertion caret is visible, calling this method hides it.

Note

The system automatically unregisters the keyboard when the

registered view is hidden or closed. The protokeypad proto

also automatically handles registration for you in its

viewSetupDoneScript. You do not need to call the

UnregisterOpenKeyboard method in these cases. ◆

You can use the OpenKeypadFor function to open a context-sensitive keyboard

for a view. This function ﬁrst attempts to open the keyboard deﬁned in the view’s

_keyboard slot. If the view does not define a keyboard in that slot,

OpenKeypadFor determines if the view allows only a single type of input, such

as date, time, phone number, or numbers. If so,

OpenKeypadFor opens the

appropriate built-in keyboard for that input type. If none of these other conditions

is met,

OpenKeypadFor opens the alphaKeyboard keyboard for the view.

Note

The Newton System Software uses the OpenKeypadFor

function to open a context-sensitive keyboard when the user

double-taps on a view in which a

_keyboard slot is deﬁned. ◆

Theses methods and functions, as well as several others you can use with the

keyboard registry in your applications, are described in “Keyboard Registry

Functions and Methods” (page 7-44) in Newton Programmer’s Reference.

Deﬁning Tabbing Orders 8

You can deﬁne the tabbing order for an input view with the _tabChildren slot,

which contains an array of view paths.

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