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Scale

The scale widget allows the user to pick a number out of a range. In other toolkits, this is called a slider. Here is an example of the creation of a scale:

    f := frame(side='left')
    v := scale(f,0,110,text='Volume')
    t := scale(f,0,110,text='Treble')
    b := scale(f,0,110,text='Bass')

The interface which this example creates is shown in Figure 11.8.

Figure 11.8: Scale

The value of the slider is posted with the value event. Here is an example,

    whenever v->value do
        print "Volume:",$value

This whenever prints out a message each time the volume is changed. Note however if you just want to get the last value of the slider, it is accessible as a member of the agent, in this case v.value. This is because the last value of each event name is retained in the agent. As a result, whenever statements are often not needed with scales. Table 11.10 lists the other construction parameters for scales, and Table 11.11 lists the scale events.

Table 11.10: Scale Construction Parameters

Parameter	Default	Values	Description
parent		widget	parent of the scale
start	0.0	float	starting integer for scale
end	100.0	float	ending integer for scale
value	start	float	initial value for the scale
length	110	integer	length of scale
text	''	string	optional label for scale
resolution	1.0	float	resolution of the scale
orient	'horizontal'	'horizontal' 'vertical	orientation of scale
width	'15'	dimension	width/height of the thumb
font	''	X font	text font
relief	'flat'	'flat' 'ridge' 'raised' 'sunken' 'groove'	edge relief
borderwidth	2	dimension	border width
foreground	'black'	X color	color of text
background	'lightgrey'	X color	background color
fill	''	'x' 'y' 'both' 'none'	how to expand when resized; default: expand with orient
hlcolor	''	X color	highlight color with focus
hlbackground	''	X color	highlight color without focus
hlthickness	[]	dimension	hightlight border thickness
showvalue	T	boolean	display the selected value?

Table 11.11: Scale Events

Event	I/O	Values	Description
background	$\rightarrow$	X color	change background color
bind	$\rightarrow$	<X> <G>	associate Xevent <X> with Glish event <G>
borderwidth	$\rightarrow$	dimension	change border width
end	$\rightarrow$	integer	change ending value
font	$\rightarrow$	X font	set text font
foreground	$\rightarrow$	X color	change foreground color
hlbackground	$\rightarrow$	X color	highlight color without focus
hlcolor	$\rightarrow$	X color	highlight color with focus
hlthickness	$\rightarrow$	dimension	hightlight border thickness
length	$\rightarrow$	integer	change length of scale
orient	$\rightarrow$	'horizontal' 'vertical	change orientation
relief	$\rightarrow$	'flat' 'ridge' 'raised' 'sunken' 'groove'	change border relief
resolution	$\rightarrow$	float	change resolution of scale
showvalue	$\rightarrow$	boolean	show/hide scale value
start	$\rightarrow$	integer	change starting value
text	$\rightarrow$	string	set scale label
value	$\leftarrow$	integer	value changed by user
width	$\rightarrow$	integer	change width/height of scale