scale man page on Oracle

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scale(n)		     Tk Built-In Commands		      scale(n)

______________________________________________________________________________

NAME
       scale - Create and manipulate scale widgets

SYNOPSIS
       scale pathName ?options?

STANDARD OPTIONS
       -activebackground     -foreground	  -relief
       -background	     -highlightbackground -repeatdelay
       -borderwidth	     -highlightcolor	  -repeatinterval
       -cursor		     -highlightthickness  -takefocus
       -font		     -orient		  -troughcolor

       See the options manual entry for details on the standard options.

WIDGET-SPECIFIC OPTIONS
       [-bigincrement bigIncrement] Some interactions with the scale cause its
       value to change by “large” increments;  this option specifies the  size
       of  the	large  increments.   If	 specified  as 0, the large increments
       default to 1/10 the range of the scale.	 [-command command]  Specifies
       the  prefix  of	a  Tcl command to invoke whenever the scale's value is
       changed via a widget command.  The  actual  command  consists  of  this
       option  followed	 by a space and a real number indicating the new value
       of the scale.  [-digits digits] An integer specifying how many signifi‐
       cant  digits  should be retained when converting the value of the scale
       to a string.  If the number is less than or equal  to  zero,  then  the
       scale  picks  the  smallest  value  that guarantees that every possible
       slider position prints as a  different  string.	 [-from from]  A  real
       value   corresponding   to   the	  left	 or  top  end  of  the	scale.
       [-label label] A string to display as a label for the scale.  For  ver‐
       tical scales the label is displayed just to the right of the top end of
       the scale.  For horizontal scales the label is displayed just above the
       left  end of the scale.	If the option is specified as an empty string,
       no label is displayed.  [-length length]	 Specifies  the	 desired  long
       dimension  of  the scale in screen units (i.e. any of the forms accept‐
       able to Tk_GetPixels).  For vertical scales this is the scale's height;
       for  horizontal	scales	it is the scale's width.  [-resolution resolu‐
       tion] A real value specifying the resolution for the  scale.   If  this
       value  is  greater  than	 zero  then  the  scale's value will always be
       rounded to an even multiple of this value, as will tick marks  and  the
       endpoints  of the scale.	 If the value is less than zero then no round‐
       ing occurs.  Defaults to 1 (i.e., the value will be integral).  [-show‐
       value showValue]	 Specifies  a  boolean value indicating whether or not
       the  current  value  of	the  scale  is	to  be	displayed.   [-slider‐
       length sliderLength]  Specifies	the  size  of  the slider, measured in
       screen units along the slider's long dimension.	The value may be spec‐
       ified  in  any  of  the	forms acceptable to Tk_GetPixels.  [-sliderre‐
       lief sliderRelief] Specifies the relief to use when drawing the slider,
       such as raised or sunken.  [-state state] Specifies one of three states
       for the scale:  normal, active, or disabled.  If the scale is  disabled
       then  the value may not be changed and the scale will not activate.  If
       the scale is active, the slider is displayed using the color  specified
       by the activeBackground option.	[-tickinterval tickInterval] Must be a
       real value.  Determines the spacing between numerical tick  marks  dis‐
       played below or to the left of the slider.  If 0, no tick marks will be
       displayed.  [-to to] Specifies a real value corresponding to the	 right
       or  bottom  end	of  the	 scale.	 This value may be either less than or
       greater than the from option.  [-variable variable] Specifies the  name
       of  a  global variable to link to the scale.  Whenever the value of the
       variable changes, the scale will update to reflect this	value.	 When‐
       ever the scale is manipulated interactively, the variable will be modi‐
       fied to reflect the scale's new value.	[-width width]	Specifies  the
       desired narrow dimension of the trough in screen units (i.e. any of the
       forms acceptable to Tk_GetPixels).  For vertical	 scales	 this  is  the
       trough's width;	for horizontal scales this is the trough's height.
_________________________________________________________________

DESCRIPTION
       The scale command creates a new window (given by the pathName 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 con‐
       figure aspects of the  scale  such  as  its  colors,  orientation,  and
       relief.	 The scale command returns its pathName argument.  At the time
       this command is invoked, there must not exist a window named  pathName,
       but pathName's parent must exist.

       A  scale	 is  a	widget	that displays a rectangular trough and a small
       slider.	The trough corresponds to a range of real  values  (determined
       by  the	from,  to,  and	 resolution  options), and the position of the
       slider selects a particular real value.	 The  slider's	position  (and
       hence  the scale's value) may be adjusted with the mouse or keyboard 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.	In addition, the value of  the
       scale  can  be linked to a Tcl variable (using the variable option), so
       that changes in either are reflected in the other.

       Three annotations may be displayed in a scale widget:  a label  appear‐
       ing  at the top right of the widget (top left for horizontal scales), a
       number displayed just to the left of the slider (just above the	slider
       for  horizontal	scales), and a collection of numerical tick marks just
       to the left of the current value (just below the trough for  horizontal
       scales).	  Each	of  these three annotations may be enabled or disabled
       using the configuration options.

WIDGET COMMAND
       The scale command creates a new Tcl command  whose  name	 is  pathName.
       This  command  may  be used to invoke various operations on the widget.
       It has the following general form:
	      pathName option ?arg arg ...?
       Option and the args determine the exact behavior of the	command.   The
       following commands are possible for scale widgets:

       pathName cget option
	      Returns  the  current value of the configuration option given by
	      option.  Option may have any of the values accepted by the scale
	      command.

       pathName configure ?option? ?value option value ...?
	      Query  or modify the configuration options of the widget.	 If no
	      option is specified, returns a list describing all of the avail‐
	      able  options for pathName (see Tk_ConfigureInfo for information
	      on the format of this list).  If option  is  specified  with  no
	      value,  then the command returns a list describing the one named
	      option (this list will be identical to the corresponding sublist
	      of  the  value  returned	if no option is specified).  If one or
	      more option-value 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.	 Option may  have  any
	      of the values accepted by the scale command.

       pathName coords ?value?
	      Returns a list whose elements are the x and y coordinates of the
	      point along the centerline of the	 trough	 that  corresponds  to
	      value.   If  value  is omitted then the scale's current value is
	      used.

       pathName get ?x y?
	      If x and y are omitted, returns the current value of the	scale.
	      If x and y are specified, they give pixel coordinates within the
	      widget;  the command returns the scale  value  corresponding  to
	      the  given  pixel.   Only one of x or y is used:	for horizontal
	      scales y is ignored, and for vertical scales x is ignored.

       pathName identify x y
	      Returns a string indicating what part of the  scale  lies	 under
	      the  coordinates	given  by  x  and y.  A return value of slider
	      means that the point is over the slider;	trough1 means that the
	      point is over the portion of the slider above  or to the left of
	      the slider; and trough2 means that the point is over the portion
	      of the slider below or to the right of the slider.  If the point
	      is not over one of these elements, an empty string is returned.

       pathName set value
	      This command is invoked to  change  the  current	value  of  the
	      scale,  and hence the position at which the slider is displayed.
	      Value gives the new value for the scale.	 The  command  has  no
	      effect if the scale is disabled.

BINDINGS
       Tk  automatically  creates class bindings for scales that give them the
       following default behavior.  Where the behavior is different for verti‐
       cal  and	 horizontal  scales,  the  horizontal behavior is described in
       parentheses.

       [1]    If button 1 is pressed in the trough, the scale's value will  be
	      incremented or decremented by the value of the resolution option
	      so that the slider moves in the direction of the cursor.	If the
	      button is held down, the action auto-repeats.

       [2]    If  button  1  is	 pressed  over	the  slider, the slider can be
	      dragged with the mouse.

       [3]    If button 1 is pressed in the trough with the Control key	 down,
	      the  slider  moves  all  the way to the end of its range, in the
	      direction towards the mouse cursor.

       [4]    If button 2 is pressed, the scale's value is set	to  the	 mouse
	      position.	  If  the  mouse  is  dragged  with button 2 down, the
	      scale's value changes with the drag.

       [5]    The Up and Left keys move the slider up (left) by the  value  of
	      the resolution option.

       [6]    The  Down	 and  Right  keys  move the slider down (right) by the
	      value of the resolution option.

       [7]    Control-Up and Control-Left move the slider  up  (left)  by  the
	      value of the bigIncrement option.

       [8]    Control-Down  and	 Control-Right move the slider down (right) by
	      the value of the bigIncrement option.

       [9]    Home moves the slider to the top (left) end of its range.

       [10]   End moves the slider to the bottom (right) end of its range.

       If the scale is disabled using the state option then none of the	 above
       bindings have any effect.

       The  behavior  of  scales  can  be changed by defining new bindings for
       individual widgets or by redefining the class bindings.

KEYWORDS
       scale, slider, trough, widget

Tk				      4.1			      scale(n)
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