Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 97)

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101

CHAPTER 3

Views

About Views 3-13

viewSetupFormScript: func()

begin

local b := GetAppParams();

self.viewbounds := RelBounds(

b.appAreaLeft,

b.appAreaTop,

min(200, b.appAreaWidth), // 200 pixels wide max

min(300, b.appAreaHeight)); // 300 pixels high max

end

Don’t blindly size your application to the full extents of the screen. This might look

odd if your application runs on a system with a much larger screen.

Do include a border around your application base view. That way, if the application

runs on a screen that is larger than the size of your application, the user will be able

to clearly see its boundaries.

The important point is to correctly size the application base view. Child views are

positioned relative to the application base view. If you have a dynamically sizing

application base view, make sure that the child views also are sized dynamically, so

that they are laid out correctly no matter how the dimensions of the base view

change. You can ensure correct layout by using parent-relative and sibling-relative

view alignment, as explained in the next section, “View Alignment.”

One additional consideration you should note is that on a larger screen, it may be

possible for the user to move applications around. You should not rely on the

top-left coordinate of your application base view being ﬁxed. To prevent this from

happening check your application’s current location when you work with global

coordinates. To do this, send the

GlobalBox message to your application base view.

View Alignment 3

The viewJustify slot is used to set the view alignment and is closely linked in

its usage and effects with the

viewBounds slot.

The

viewJustify slot speciﬁes how text and graphics are aligned within the

view and how the bounds of the view are aligned relative to its parent or sibling

views. (Sibling views are child views that have a common parent view.)

In the

viewJustify slot, you can specify one or more alignment attributes,

which are represented by constants deﬁned as bit ﬂags. You can specify one

alignment attribute from each of the following groups:

■ horizontal alignment of view contents (applies to views of class

clParagraphView and clPictureView only)

■ vertical alignment of view contents (applies to views of class

clParagraphView and clPictureView only)

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Apple Newton Utilities Guide de l'utilisateur Page 97

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