This is not necessarily the current version of this TIP.This is not necessarily the current version of this TIP.
| TIP: | 110 |
| Title: | Add a Tristate Mode to the Checkbutton and Radiobutton |
| Version: | $Revision: 1.3 $ |
| Author: | Brian Griffin <bgriffin at model dot com> |
| State: | Draft |
| Type: | Project |
| Tcl-Version: | 9.0 |
| Vote: | Pending |
| Created: | Tuesday, 01 October 2002 |
This TIP proposes adding a third value (tristate) to the -state option of the checkbutton and radiobutton widgets.
In order to meet more demanding requirements of todays complex graphical user interfaces, it would help add to the functionality of the basic checkbutton and radiobutton widgets. To support using checkbuttons and radiobuttons along with multiple selection, it is necessary for the checkbutton to be able to display a third state, i.e., both On and Off. This indicates the situation where a property has a particular value for some members of a multiple selection, but not others.
The change would add a the state "tristate" to the -state option of the checkbutton and radiobutton widgets. The widget would then display the check/dot mark (as appropriate) along with a "grayed" background. When the checkbutton or radiobutton is invoked (i.e. clicked on) it would behave exactly as it does currently with the addition of modifying the -state from "tristate" to "normal".
There is a concern that the Unix version of these widgets do not have a sufficiently different appearance when in the tristate state compared with the On and Off states. This issue is addressed in TIP #109.
This document has been placed in the public domain.
This is not necessarily the current version of this TIP.