Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 300)

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CHAPTER 8

Text and Ink Input and Display

8-8 Using Text

Here is an example of a template deﬁning a view of the clEditView class:

editor := {...

viewClass: clEditView,

viewBounds: {left:0, top:0, right:200, bottom:200},

viewFlags: vVisible+vAnythingAllowed,

viewFormat: vfFillWhite+vfFrameBlack+vfPen(1)+

vfLinesLtGray,

viewLineSpacing: 20,

// methods and other view-specific slots

viewSetupFormScript: func()...

...}

System Messages in Automatically Created Views 8

When a child view is automatically created by a clEditView, the vNoScripts

ﬂag is set in the

viewFlags slot of the child view. This ﬂag prevents system

messages from being sent to a view.

This behavior is normally desirable for automatically created views, because they

have no system message-handling methods and the system saves time by not

sending the messages to them.

If you want to use one of these views in a manner that requires it to receive system

messages, you need to remove the

vNoScripts ﬂag from the viewFlags slot of

the view.

Creating the Lined Paper Effect in a Text View 8

A view of the clEditView class can appear simply as a blank area in which the

user writes information. However, this type of view usually contains a series of

horizontal dotted lines, like lined writing paper. The lines indicate to the user that

the view accepts input. To create the lined paper effect, you must set the following

slots appropriately:

viewFormat Must include one of the vfLines… ﬂags. This activates the

line display.

viewLineSpacing

Sets the spacing between the lines, in pixels.

viewLinePattern

Optional. Sets a custom pattern that is used to draw the lines

in the view. In the

viewFormat slot editor in NTK, you

must also set the Lines item to Custom to signal that

you are using a custom pattern. (This sets the

vfCustom<<vfLinesShift flag in the viewFormat

slot.)

Patterns are binary data structures, which are described in the

next section.

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Apple Newton Utilities Guide de l'utilisateur Page 300

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