Figure 3-31

Where an Action button goes

3-29

 

 

 

Figure 3-32

Seeing an Item Info slip

3-30

 

 

 

Figure 3-33

A Rotate button lets users change the screen

 

 

 

orientation

3-31

 

 

 

 

 

Chapter 4

Pickers

4-1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 4-1

The parts of list pickers

4-2

 

 

 

 

Figure 4-2

A list picker can contain a two-dimensional table

 

 

of items

 

4-5

 

 

 

 

 

 

Figure 4-3

Remove unavailable items from a list picker

4-5

 

Figure 4-4

Grouping items in list pickers

4-7

 

 

 

Figure 4-5

Pickers can pop up from buttons, labels, and

 

 

 

hot spots

 

4-8

 

 

 

 

 

 

Figure 4-6

How a list picker should align with its label

 

 

 

or button

 

4-9

 

 

 

 

 

 

Figure 4-7

Using a list picker from a button

4-10

 

 

Figure 4-8

Using a list picker from a label

4-10

 

 

 

Figure 4-9

List pickers that are too long to display all at once

 

 

have scroll arrows

4-12

 

 

 

 

 

Figure 4-10

A lengthy picker can include scroll arrows and

 

 

 

index tabs

4-13

 

 

 

 

 

 

Figure 4-11

How a two-level hierarchy of list pickers works

4-15

 

Figure 4-12

A number picker simplifies specifying a numerical

 

 

value

4-16

 

 

 

 

 

 

Figure 4-13

Time pickers specify a time, a time range, or a

 

 

 

time offset

4-17

 

 

 

 

 

 

Figure 4-14

Date pickers specify one date or a date range

4-18

 

Figure 4-15

The parts of overview pickers

4-20

 

 

 

Figure 4-16

Entering a new value in an overview picker

4-22

 

Figure 4-17

An Info picker lists information items

4-24

 

 

Figure 4-18

The New picker lists types of data items that users

 

 

can create

4-25

 

 

 

 

 

 

Figure 4-19

The Show picker lists alternate ways to see an

 

 

 

application’s data

4-26

 

 

 

 

 

Figure 4-20

The Action picker lists commands for acting

 

 

 

on data

 

4-27

 

 

 

 

 

 

Figure 4-21

A People picker excerpts items from the Names File

 

 

and Owner Info applications

4-28

 

 

xvi

Page 16
Image 16
Apple 2 manual Pickers, Xvi

2 specifications

The Apple II is a defining product in the history of personal computing, first introduced in 1977 by Apple Computer, Inc. Designed by Steve Wozniak, the Apple II was one of the first highly successful mass-produced microcomputer products and played a significant role in bringing personal computers into homes and schools.

One of the Apple II's standout features was its color graphics capability. It was one of the first personal computers to provide color output, thanks to its built-in video interface. The initial model supported a resolution of 280x192 pixels with a palette of 6 colors, which allowed for vibrant visuals that set it apart from contemporaries like the monochrome Altair 8800.

The Apple II was notable for its open architecture. This design allowed users to expand the computer's capabilities easily through a series of expansion slots. Users could add floppy disk drives, additional memory, and various peripheral devices, making the system highly adaptable to individual needs. This encouraged a thriving ecosystem of third-party hardware and software, which contributed to its popularity.

Another significant feature was its use of the 6502 microprocessor. This 8-bit CPU was not only affordable but also powerful for its time, allowing the Apple II to run various applications efficiently. Along with a built-in keyboard and an innovative plastic case that housed its components, the design was user-friendly and appealing.

The Apple II also introduced the concept of “bootable software” through the use of floppy disks. The disk operating system (DOS) allowed users to store and run multiple programs without having to reload software manually, providing a level of convenience that had not been widely available before. Key software like VisiCalc, the first spreadsheet program, helped boost sales, showcasing the Apple II's utility in business and education environments.

The computer was also well-known for its early adoption of BASIC programming language. Apple provided an operating system that supported Applesoft BASIC, which enabled users, including students, to write their programs, further fostering a community of developers.

In summary, the Apple II's color graphics, open architecture, powerful 6502 processor, innovative use of floppy disks, and support for BASIC programming made it a revolutionary product in its time. Its legacy laid the groundwork for future personal computers and established Apple as a leader in the burgeoning tech industry. The Apple II remains an iconic symbol of the early personal computing era, reflecting a generation's transition into a digitally connected world.