Pickers, Pop-up Views, and Overviews

Map Pickers

The protoGeneralPopup

sends a

pickCancelledScript

to the

callbackContext

specified in the

New

method. However, it does not send a

pickActionScript

back; instead, it sends an

Affirmative

message to itself.

You supply the method and decide what call to make to the context and what
information to send back.

To put other objects in the

protoGeneralPopup

, just drag them out in NTK. For

example, if you want a checkbox in your pop-up view, drag out a

protoCheckbox

. You can put anything in the pop-up view, including your

own protos.

Since you have to assemble the information to send on an affirmative, you will
likely end up declaring your content to the general pop-up.

The only slots you really need to set are

Affirmative

and

viewBounds

.

Affirmative

is a function. Here's an example:

func()
begin
// Notify the context that the user has accepted the
// changes made in the popup
if context then
context:?pickActionScript(changeData) ;
end

Map Pickers

6

You can use the pickers described in this section to display maps and allow the user
to select countries, U.S. states, Canadian provinces, and cities. The Newton system
software provides the following map picker protos:

The

protoCountryPicker

displays a map of the world. When the user taps a

country, the

PickWorld

message is sent to your view. For information about

the slots and methods for this picker, see "protoCountryPicker" (page 5-30) in
Newton Programmer's Reference. Figure 6-8 shows an example of a

protoCountryPicker

.