Apple Computer Network Router 2 Manual do Utilizador descarregar pdf (Página 114)

CHAPTER 3

Controls

3-20 Sliders

the user may brieﬂy ponder the signiﬁcance of changing the checkbox’s state.

For example, a checkbox in a fax routing slip lets a user select fine resolution

or not. This option could be implemented with two radio buttons, perhaps

labeled “Fine” and “Standard.” A user is more likely to think about all the

ramifications of the choice with a checkbox than with two radio buttons.

Figure 3-19 illustrates the two approaches.

Figure 3-19 One checkbox vs. two radio buttons

You can use checkboxes to control options and set attributes in your applica-

tion. But use a text button or picture button, not a checkbox, to bring up a

slip; to conﬁrm, authorize, cancel, or stop an action; or to initiate a process.

Sliders 3

The Newton interface also includes a slider, with which users can set a

magnitude, position, probability, or other value in a range. Users set a value

by dragging a diamond-shaped knob. The knob indicates the current value

relative to the maximum and minimum values. A slider should have labels

that identify the range and direction of the slider. Figure 3-20 shows an

example of a slider.

Checkbox takes less space and may make a

user think about unstated consequences, but

the unlabeled state may be ambiguous

Radio buttons explicitly label choices, but take

more space and may obscure unstated

consequences

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 306 307

Sem comentários

Apple Computer Network Router 2 Manual do Utilizador Página 114