Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 92)

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CHAPTER 3

Views

3-8 About Views

As the grid lines are inﬁnitely thin, so a point is inﬁnitely small. Pixels, by contrast,

lie between the lines of the coordinate grid, not at their intersections.

This relationship gives them a deﬁnite physical extent, so that they can be seen on

the screen.

Deﬁning View Characteristics 3

A template that describes a view is stored as a frame that has slots for view

characteristics. Here is a NewtonScript example of a template that describes a view:

{viewClass: clView,

viewBounds: RelBounds( 20, 50, 94, 142 ),

viewFlags: vNoFlags,

viewFormat:vfFillWhite+vfFrameBlack+vfPen(1),

viewJustify: vjCenterH,

viewFont: simpleFont10,

declareSelf: 'base,

debug: "dialer",

};

Brieﬂy, the syntax for deﬁning a frame is:

{slotName: slotValue,

slotName: slotValue,

...};

where slotName is the name of a slot, and slotValue is the value of a slot. For more

details on NewtonScript syntax, refer to The NewtonScript Programming Language.

Frames serving as view templates have slots that deﬁne the following kinds of view

characteristics:

Class The

viewClass slot deﬁnes the class of graphic object from

which the view is constructed.

Behavior The

viewFlags slot deﬁnes other primary view behaviors

and controls recognition behavior.

Location, size, and alignment

The

viewBounds and viewJustify slots deﬁne the

location, size, and alignment of the view and its contents.

Appearance The

viewFormat slot deﬁnes the frame and ﬁll

characteristics. The

viewFillPattern and

viewFramePattern slots control custom patterns.

Transfer modes used in drawing the view are controlled

by the

viewTransferMode slot.

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