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scale.n
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scale(n) Tk Commands
_________________________________________________________________
NAME
scale - Create and manipulate scale widgets
SYNOPSIS
scale _p_a_t_h_N_a_m_e ?_o_p_t_i_o_n_s?
STANDARD OPTIONS
activeForeground borderWidth fontorient |
background cursor foreground relief |
See the ``options'' manual entry for details on the standard
options.
WIDGET-SPECIFIC OPTIONS
Name: command
Class: Command
Command-Line Switch:-command
Specifies the prefix of a Tcl command to invoke when-
ever the value of the scale is changed interactively.
The actual command consists of this option followed by
a space and a number. The number indicates the new
value of the scale.
Name: from
Class: From
Command-Line Switch:-from
Specifies the value corresponding to the left or top
end of the scale. Must be an integer.
Name: label
Class: Label
Command-Line Switch:-label
Specifies a string to displayed as a label for the
scale. For vertical scales the label is displayed just
to the right of the top end of the scale. For horizon-
tal scales the label is displayed just above the left
end of the scale.
Name: length
Class: Length
Command-Line Switch:-length
Specifies the desired long dimension of the scale in |
screen units (i.e. any of the forms acceptable to |
Tk_GetPixels). For vertical scales this is the scale's
height; for horizontal scales it is the scale's width.
Tk 1
scale(n) Tk Commands
Name: showValue
Class: ShowValue
Command-Line Switch:-showvalue
Specifies a boolean value indicating whether or not the
current value of the scale is to be displayed.
Name: sliderForeground
Class: sliderForeground
Command-Line Switch:-sliderforeground
Specifies the color to use for drawing the slider under
normal conditions. When the mouse is in the slider
window then the slider's color is determined by the
activeForeground option.
Name: sliderLength
Class: SliderLength
Command-Line Switch:-sliderlength
Specfies the size of the slider, measured in screen |
units along the slider's long dimension. The value may |
be specified in any of the forms acceptable to |
Tk_GetPixels. |
Name: state |
Class: State |
Command-Line Switch:-state |
||
Specifies one of two states for the scale: normal or |
disabled. If the scale is disabled then the value may |
not be changed and the scale won't activate when the |
mouse enters it.
Name: tickInterval
Class: TickInterval
Command-Line Switch:-tickinterval
Must be an integer value. Determines the spacing
between numerical tick-marks displayed below or to the
left of the slider. If specified as 0, then no tick-
marks will be displayed.
Name: to
Class: To
Command-Line Switch:-to
Specifies the value corresponding to the right or bot-
tom end of the scale. Must be an integer. This value
may be either less than or greater than the from
option.
Tk 2
scale(n) Tk Commands
Name: width
Class: Width
Command-Line Switch:-width
Specifies the desired narrow dimension of the scale in |
screen units (i.e. any of the forms acceptable to |
Tk_GetPixels). For vertical scales this is the scale's
width; for horizontal scales this is the scale's
height.
_________________________________________________________________
DESCRIPTION
The scale command creates a new window (given by the _p_a_t_h_-
_N_a_m_e argument) and makes it into a scale widget. Additional
options, described above, may be specified on the command
line or in the option database to configure aspects of the
scale such as its colors, orientation, and relief. The
scale command returns its _p_a_t_h_N_a_m_e argument. At the time
this command is invoked, there must not exist a window named
_p_a_t_h_N_a_m_e, but _p_a_t_h_N_a_m_e's parent must exist.
A scale is a widget that displays a rectangular region and a
small _s_l_i_d_e_r. The rectangular region corresponds to a range
of integer values (determined by the from and to options),
and the position of the slider selects a particular integer
value. The slider's position (and hence the scale's value)
may be adjusted by clicking or dragging with the mouse as
described in the BINDINGS section below. Whenever the
scale's value is changed, a Tcl command is invoked (using
the command option) to notify other interested widgets of
the change.
Three annotations may be displayed in a scale widget: a
label appearing at the top-left of the widget (top-right for
vertical scales), a number displayed just underneath the
slider (just to the left of the slider for vertical scales),
and a collection of numerical tick-marks just underneath the
current value (just to the left of the current value for
vertical scales). Each of these three annotations may be
selectively enabled or disabled using the configuration
options.
WIDGET COMMAND
The scale command creates a new Tcl command whose name is
_p_a_t_h_N_a_m_e. This command may be used to invoke various opera-
tions on the widget. It has the following general form:
_p_a_t_h_N_a_m_e _o_p_t_i_o_n ?_a_r_g _a_r_g ...?
_O_p_t_i_o_n and the _a_r_gs determine the exact behavior of the com-
mand. The following commands are possible for scale
Tk 3
scale(n) Tk Commands
widgets:
_p_a_t_h_N_a_m_e configure ?_o_p_t_i_o_n? ?_v_a_l_u_e _o_p_t_i_o_n _v_a_l_u_e ...?
Query or modify the configuration options of the
widget. If no _o_p_t_i_o_n is specified, returns a list
describing all of the available options for _p_a_t_h_N_a_m_e
(see Tk_ConfigureInfo for information on the format of
this list). If _o_p_t_i_o_n is specified with no _v_a_l_u_e, then
the command returns a list describing the one named
option (this list will be identical to the correspond-
ing sublist of the value returned if no _o_p_t_i_o_n is
specified). If one or more _o_p_t_i_o_n-_v_a_l_u_e pairs are
specified, then the command modifies the given widget
option(s) to have the given value(s); in this case the
command returns an empty string. _O_p_t_i_o_n may have any
of the values accepted by the scale command.
_p_a_t_h_N_a_m_e get
Returns a decimal string giving the current value of
the scale.
_p_a_t_h_N_a_m_e set _v_a_l_u_e
This command is invoked to change the current value of
the scale, and hence the position at which the slider
is displayed. _V_a_l_u_e gives the new value for the scale.
BINDINGS
When a new scale is created, it is given the following ini-
tial behavior by default:
<Enter> Change the slider display to use
activeForeground instead of sliderFore-
ground.
<Leave> Reset the slider display to use slider-
Foreground instead of activeForeground.
<ButtonPress-1> Change the slider display so that the
slider appears sunken rather than
raised. Move the slider (and adjust the
scale's value) to correspond to the
current mouse position.
<Button1-Motion> Move the slider (and adjust the scale's
value) to correspond to the current
mouse position.
<ButtonRelease-1> Reset the slider display so that the
slider appears raised again.
Tk 4
scale(n) Tk Commands
KEYWORDS
scale, widget
Tk 5