Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 301)

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CHAPTER 8

Text and Ink Input and Display

Using Text 8-9

Deﬁning a Line Pattern 8

You can deﬁne a custom line pattern for drawing the horizontal lines in a paragraph

view. A line pattern is an eight-byte binary data structure with the class

'pattern.

To create a binary pattern data structure on the ﬂy, use the following

NewtonScript trick:

myPattern := SetClass( Clone("\uAAAAAAAAAAAAAAAA"),

'pattern );

This code clones a string, which is already a binary object, and changes its class to

'pattern. The string is specified with hex character codes whose binary represen-

tation creates the pattern. Each two-digit hex code creates one byte of the pattern.

Including Editable Child Views in an Input View 8

For a child view of a clEditView to be editable, you need to follow certain rules:

■ The child view must reside in the viewChildren slot of the clEditView.

You cannot store a child view’s template in the

stepChildren slot, as NTK

normally does.

■ The child view must contain a viewStationery slot with an appropriate

value, depending on the view class and data type. The acceptable values are

shown in Table 8-2:

■ Add the child view templates to the viewChildren array of the edit view and

open the view or send it the

RedoChildren message. Alternatively, you can

add the child view with the

AddView method and then send the Dirty message

to the edit view.

Table 8-2 viewStationery slot value for clEditView children

View class View data type

Value of

viewStationery slot

clParagraphView

text

'para

clPolygonView

recognized

graphics

'poly

clPolygonView

ink

'ink

clPictureView

bitmap or

picture object

'pict

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Apple Newton Utilities Guide de l'utilisateur Page 301

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