Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 327)

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CHAPTER 8

Text and Ink Input and Display

Using Text 8-35

Key Dimensions 8

The width and height of keys are speciﬁed in units, not pixels. A key unit is not a

ﬁxed size, but is used to specify the size of a key relative to other keys. The width

of a unit depends on the total width of all keys in the view and on the width of the

view itself. Key widths and heights can be speciﬁed in whole units, half units,

quarter units, and eighth units.

When it is displayed, the whole keyboard is scaled to ﬁt entirely within whatever

size view bounds you specify for it.

To ﬁt the whole keyboard within the width of a view, the total unit widths are

summed for each row, and the scaling is determined based on the widest row. This

row is scaled to ﬁt within the view width, giving an equal pixel width to each

whole key unit. A similar process is used to scale keys vertically to ﬁt within the

height of a view.

Fractional key units (half, quarter, eighth), when scaled, must be rounded to an

integer number of pixels, and thus may not be exactly the indicated fraction of a

whole key unit. For example, if the keys are scaled to ﬁt in the view bounds,

a whole key unit ends up to be 13 pixels wide. This means that a key speciﬁed to

have a width of 1 3/8 units (

keyHUnit+keyHEighth*3) is rounded to 13 + 5, or

18 pixels, which is not exactly 1 3/8 *13.

keyFramed Specify the thickness of the frame around the key. Multiply

this constant by the number of pixels that you want to use

for the frame thickness, from 0-3.

keyRoundingUnit Specify the roundedness of the frame corners. Multiply this

constant by the number of pixels that you want to use for

the corner radius, from 0-15, zero being square.

keyLeftOpen No frame line is drawn along the left side of this key.

keyTopOpen No frame line is drawn along the top side of this key.

keyRightOpen No frame line is drawn along the right side of this key.

keyBottomOpen No frame line is drawn along the bottom side of this key.

keyHUnit

keyHHalf

keyHQuarter

keyHEighth

A combination of these four constants speciﬁes the

horizontal dimension of the key in units. For details,

see the next section.

keyVUnit

keyVHalf

keyVQuarter

keyVEighth

A combination of these four constants speciﬁes the

vertical dimension of the key in units. For details, see

the next section.

Table 8-8 Key descriptor constants (continued)

1 2 ... 322 323 324 325 326 327 328 329 330 331 332 ... 941 942

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