Apple Newton Utilities User's Guide download pdf (Page 121)

100

101

CHAPTER 3

Views

Using Views 3-37

needed values. Your template is only a two-slot object in RAM. The user proto

resides in the package with the rest of your application. The conventional, RAM-

wasting alternative would have been:

template := Clone(PT_dynoTemplate);

template.viewBounds := RelBounds(x, y, width, height);

Note that for creating views arranged in a table, there is a function called

LayoutTable that calculates all the bounds. It returns an array of templates.

Making a Picker View 3

To create a transient pop-up list view, or picker, you can use the function

PopupMenu. This kind of view pops up on the screen and is a list from which the

user can make a choice by tapping it. As soon as the user chooses an item, the

picker view is closed.

You can also create a picker view by deﬁning a template using the

protoPicker

view proto. See “Pickers, Pop-up Views, and Overviews” (page 6-1) for

information on

protoPicker and PopupMenu.

Changing the Values in viewFormat 3

You can change the values in the viewFormat slot of a view without closing and

reopening a view. Use the

SetValue function to update the view with new

settings. For example:

SetValue(myView, ‘viewFormat, 337)

// 337 = vfFillWhite + vfFrameBlack+vfPen(1)

SetValue

, among other things, calls Dirty if necessary, so you don’t need to

call it to do a task that the view system already knows about, such as changing

viewBounds or text slots in a view.

Determining Which View Item Is Selected 3

To determine which view item is selected in a view call GetHiliteOffsets.

You must call this function in combination with the

HiliteOwner function.

When you call

GetHiliteOffsets, it returns an array of arrays. Each item in

the outer array represents selected subviews, as in the following example:

x:= gethiliteoffsets()

#440CA69 [[{#4414991}, 0, 2],

[{#4417B01}, 0, 5],

[{#4418029}, 1, 3]}

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 941 942

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Apple Newton Utilities User's Guide Page 121

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