Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 766)

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CHAPTER 21

Routing Interface

21-18 Using Routing

Creating a Print Format 21

You create a print format by using protoPrintFormat. This proto is required

for routing formats with a

'view data type, such as views that you would print or

fax. This proto format is actually a view template, which displays the target object

visually. The data to be displayed is laid out as child views of the

protoPrintFormat view.

Here is an example of a format based on this proto:

// in NTK you create a new layout for view formats

MyPrintFormat := {

_proto: protoPrintFormat,

symbol: '|myPrintFormat:SIG|,

title: "PrintIt",

ViewSetupChildrenScript: func() begin

// construct child views for first page here

end,

PrintNextPageScript: func() begin

nil;

// construct child views for next page here

end,

};

For more information about the slots and methods provided by this proto, see

“Routing Format Protos” (page 18-9) in Newton Programmer’s Reference.

Topics unique to

protoPrintFormat are discussed in the following subsections.

Page Layout 21

The view based on the protoPrintFormat proto is automatically sized (in the

ViewSetupFormScript method) to fit the dimensions of a page on the output

device to which it is being routed. Do not change the values of the

viewBounds

viewJustify slots in the print format view.

You can increase the margins used on the page by setting the

margins slot. Set

this slot to a bounds rectangle frame, like this:

{left: 25, top: 20, right: 25, bottom: 30}

Each slot in this frame is interpreted as an inset from each edge of the printable

area of the paper in pixels. You must specify only non-negative values, to make

sure that you don’t print off the page. The default value of the

margins slot is

{left:0, top:0, right:0, bottom:0}.

Also, you can control the orientation of the data on the paper by setting the

orientation slot. Specify a symbol indicating whether to use the paper vertically

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