Apple 2 manual Overview Button, 38The Overview button at the bottom of a MessagePad screen

C H A P T E R 2

Container Views

on the selected items with controls in the status bar, such as a Filing button or Action button (see “Primary Controls and Status Bar” on page 2-11). A gray line separates checkboxes from data items.

If an overview lists items that users may have filed in folders, the overview should have a folder tab at the top so users can determine which folder’s items are displayed (see “Folder Tab” on page 8-19). If listed items cannot be filed in folders, the application can organize the overview by some other criterion, such as by date. For example, the Date Book groups meetings and events by date, starting with the displayed date.

Overview Button

The control for seeing an overview is the round black button located between the universal scroll arrows. On an Apple MessagePad the Overview button is at the center of the screen below the display area. Figure 2-38 shows the Overview button.

Figure 2-38The Overview button at the bottom of a MessagePad screen

Overview

Like the universal scroll arrows, the Overview button is a function of the Newton system and is not attached to one view. The Overview button affects one open view. To be affected a view must be set up during application development to receive taps on the Overview button. In addition, the view must be in front of all other open views that have also been set up to receive those taps. The view that is affected by the Overview button may be partially or completely covered by other open views that were not set up to receive Overview-button taps. (A view that receives taps on the Overview button also receives taps on the universal scroll arrows, which are described in “Universal Scroll Arrows” on page 2-38).

2-46 How Views Work