Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 541)

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CHAPTER 13

Drawing and Graphics

Using the Drawing Interface 13-15

Displaying Bitmaps, Pictures, and Graphics Shapes 13

You can use a view of the clPictureView class to display a bitmap, picture, or

graphic shape (polygon). The icon slot in this view can contain a bitmap, a picture

object, or a graphic shape.

Displaying Pictures in a clEditView 13

Use the clEditView view class to display and accept text and graphic data in a

view. Views of the

clEditView class contain no data directly; instead, they have

child views that contain the individual data items. Pictures are contained in child

views of the class

clPictureView. For details on displaying text, see “Using

Views and Protos for Text Input and Display” (page 8-6).

To add a picture to a

clEditView, you need to create an appropriate template of

the

clPictureView class, add the template to the viewChildren array, and

then open the view or call

RedoChildren. You can also use the AddView

method to add the picture to an existing view, and then mark the view as dirty so

that it will be redrawn.

The template holding the PICT items must contain the following slots:

■ viewStationery—which must have the symbol 'pict

■ viewBounds—which is a bounds frame; for example,

RelBounds(0,0,40,40)

■ icon—which is a bitmap frame, a picture object, or a graphic shape

Displaying Scaled Images of Other Views 13

Use the clRemoteView view class to display a scaled image of another view.

This class can be used to show a page preview of a full-page view in a smaller

window, for example.

The view that you want to display inside the remote view should be speciﬁed as the

single child of the remote view. This child is always hidden, and is used internally

by the remote view to construct the scaled image.

clRemoteView should never have more than one view, the scaled view,

otherwise the results are undeﬁned and subject to change.

Here is an example of a view deﬁnition of the

clRemoteView class:

myRemoteView := {...

viewclass: clRemoteView,

viewBounds: {left: 75, top: 203, right: 178,

bottom: 322},

viewFlags: vVisible+vReadOnly,

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Apple Newton Utilities Guide de l'utilisateur Page 541

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