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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 configure 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 region and a small slider. 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.


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