Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 330)

100

101

CHAPTER 8

Text and Ink Input and Display

8-38 Using Text

■ a view descended from protoInputLine with the vApplication ﬂag set in

the

viewFlags slot

The Caret Pop-up Menu 8

Normally, when the user taps the insertion caret, the system-provided Punctuation

pop-up Menu opens. However, you can override this with a pop-up menu of your

own creation.

When the user taps the insertion caret, the system starts searching for a slot named

_caretPopup. The search begins in the view owning the caret, and follows both

the proto and parent inheritance paths. The default Punctuation pop-up is stored in

the root view.

The

_caretPopup slot must hold a frame containing two slots. The ﬁrst slot,

pop, defines a list of pop-up items suitable for passing to DoPopup. The second

slot must contain a

pickActionScript. If not, control passes to the punctuation

pop-up, which has its own version of the

pickActionScript. This routine then

inserts a string, corresponding to the selected character at the caret, by using the

function

PostKeyString.

Handling Input Events 8

You sometimes need to respond to input events that occur in text views. This

section describes how to test for a selection hit and respond to keystrokes and

insertion events.

Testing for a Selection Hit 8

After the user taps the screen, you can determine if the point “hits” a speciﬁc

character or word in a paragraph view.

The

view:PointToCharOffset method returns the offset within the paragraph

that is closest to the point (

x, y). This method is described in “PointToCharOffset”

(page 7-51) in Newton Programmer’s Reference.

The

view:PointToWord method returns a frame that indicates the position of

the word within the paragraph that is closest to the point (

x, y). This method is

described in “PointToWord” (page 7-52) in Newton Programmer’s Reference.

Note

Both of these functions return nil if the view is not a paragraph

view. Also, the point you are testing must correspond to a visible

position within the paragraph view; you cannot hit-test on

off-screen portions of a view.

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Apple Newton Utilities Guide de l'utilisateur Page 330

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