**Documentation for ttk::combobox**

[Ttk]'s [combobox] [widget].
    :   http://www.tcl.tk/man/tcl8.5/TkCmd/ttk_combobox.htm

----
**Ideas for combobox autocompletion**
[TR] - I saw that the [combobox] of the [Tile] package didn't support autocompletion, so I added it using the code from [BWidget]:

 proc ComboBoxAutoComplete {path key} {
        #
        # autocomplete a string in the ttk::combobox from the list of values
        #
        # Any key string with more than one character and is not entirely
        # lower-case is considered a function key and is thus ignored.
        #
        # path -> path to the combobox
        #
        if {[string length $key] > 1 && [string tolower $key] != $key} {return}
        
        set text [string map [list {[} {\[} {]} {\]}] [$path get]]
        if {[string equal $text ""]} {return}
        
        set values [$path cget -values]
        set x [lsearch $values $text*]
        if {$x < 0} {return}
        
        set index [$path index insert]
        $path set [lindex $values $x]
        $path icursor $index
        $path selection range insert end
 }

All you need to do now, is binding <KeyRelease> to this procedure:

 package require Tk 8.5
 package require tile
 ttk::combobox .c -values [list one two three four five six seven]
 pack .c -padx 5 -pady 5
 bind .c <KeyRelease> [list ComboBoxAutoComplete .c %K]

[CLN] 2006-04-20 - Shouldn't this be in a namespace or at least be named ttkComboBoxAutoComplete?  For that matter, why not submit a patch to get this into the Tile distribution.  (Not that I wouldn't be grateful to have it available here in the mean time if I was using Tile.)

[TR] 2006-04-21 - I just read the tile paper [http://www.t-ide.com/tcl2005e/2_tile-eurotcl2005.pdf.gz] by [Rolf Ade]. It mentions autocompletion code in the demos directory of the tile distribution. I haven't used that code yet, but it seems to do the same job as the code above, just in the correct namespace and as a command like
 tile::combobox::enableAutocomplete
So, the above code is not needed, really ...

----

[jnc] Feb 5, 2010 - Here is complete auto-complete code. This code completes while in an editable or readonly combobox. It also completes the with a key press when in the drop down list from the combobox. At the bottom is a simple example.

 package require Tk
 
 namespace eval ttk::combobox {}
 
 # Required to escape a few characters to to the string match used
 proc ttk::combobox::EscapeKey {key} {
     switch -- $key {
         bracketleft  { return {\[} }
         bracketright { return {\]} }
         asterisk     { return {\*} }
         question     { return {\?} }
         default      { return $key }
     }
 }
 
 proc ttk::combobox::CompleteEntry {W key} {
     if {[string length $key] > 1 && [string tolower $key] != $key} {return}
 
     if {[$W instate readonly]} {
         set value [EscapeKey $key]
     } else {
         set value [string map { {[} {\[} {]} {\]} {?} {\?} {*} {\*} } [$W get]]
         if {[string equal $value ""]} {return}
     }
 
     set values [$W cget -values]
     set x [lsearch -nocase $values $value*]
     if {$x < 0} {return}
 
     set index [$W index insert]
     $W set [lindex $values $x]
     $W icursor $index
     $W selection range insert end
 
     if {[$W instate readonly]} {
         event generate $W <<ComboboxSelected>> -when mark
     }
 }
 
 proc ttk::combobox::CompleteList {W key} {
     set key [EscapeKey $key]
 
     for {set idx 0} {$idx < [$W size]} {incr idx} {
         if {[string match -nocase $key* [$W get $idx]]} {
             $W selection clear 0 end
             $W selection set $idx
             $W see $idx
             $W activate $idx
             break
         }
     }
 }
 
 bind ComboboxListbox <KeyPress>   { ttk::combobox::CompleteList %W %K }
 bind TCombobox       <KeyRelease> { ttk::combobox::CompleteEntry %W %K }
 
 set values {One Two Three Four Five *Hello ?Hello [Hello] Six Seven Eight Nine Ten}
 
 ttk::label .l1 -text Readonly
 ttk::combobox .c1 -state readonly -values $values
 ttk::label .l2 -text Editable
 ttk::combobox .c2 -values $values
 
 bind .c1 <<ComboboxSelected>> { puts [.c1 get] }
 bind .c2 <<ComboboxSelected>> { puts [.c2 get] }
 
 pack .l1 .c1 .l2 .c2
 

----
**Questions and Suggestions concerning ttk::combobox**

[RLH] It would be nice if a widget is involved to see a graphic showing the widget. Not necessary...but nice.

----

[D. McC] 2008 Dec 8: OK, after rummaging through the ttk::style man page and trying things out in vain, I give up. Can somebody tell me how to specify the background color for the entry portion of the ttk::combobox? And can somebody tell me why there is not even an ''option'' to specify colors of Ttk widgets in the same ultra-simple way as for Tk widgets, e.g., "-bg AntiqueWhite"?

[Bryan Oakley] 2008 Dec 8: To solve your immediate problem, try this:

 ttk::combobox .cb -style mycombobox.TCombobox
 ttk::style configure mycombobox.TCombobox -fieldbackground bisque

(using "ttk::style map" may be a better choice, but I'll leave that as an exercise for the reader)

As to why there is no option, that's the design philosophy of the themed widgets -- you lose some amount of control over individual widgets but gain the ability to create unified themes. 
  
----

[D. McC] 2008 Dec 9: Thanks--it works! Now I'll see about incorporating that into my color-scheme files.

What I still don't understand is why the programmer isn't given a choice about how much control over individual widgets (and ease of configuring them) to trade off for how much ability to create unified themes.

----

[Tim Tomkinson%|%TLT%|%] 2009-11-28 - I was annoyed that the ttk::combobox does not change the cursor to an ibeam when it is inside the text entry widget. The following binding fixes that:

 bind TCombobox <Motion> {
     if {[%W cget -state] eq "normal" && [%W identify %x %y] eq "textarea"} {
         %W configure -cursor xterm
     } else {
         %W configure -cursor ""
     }
 }
 pack [ttk::combobox .cb]
----
[MHo]: In the read-only-editfield, how is it possible, e.g. to get the entry ''Seven''? Pressing '''S''' always leads to ''Six'' (prior in the list), pressing '''S''' again does not help, pressing '''E''' right after S leads to ''Eight''. This is true for the listbox, too. 

[jnc]: Feb 24, 2010: In my misc-tcl code project, there is updated combo box code. I have not updated it here yet as I don't want to make daily updates here. The code on the misc-tcl project page allows properly for the Up/Down use of arrow keys to select items when in the readonly edit field. So, to get to Seven, you would press '''S''' and then use your up/down arrow key to navigate to Seven. This is how Windows works. I would actually prefer it to allow allow typing of '''SE''' which would go to Seven, but this would be non-standard. I am sure you can modify the above code for that type of action if you so desired.

[MHo]: At least within list boxes/tables (like explorer windows) windows navigates to the next matching entry which each keypress. So, the first '''S''' would go to ''Seven'', the next '''S''' to ''Six'' etc.

My miscellaneous Tcl code is located at: http://jeremy.cowgar.com/misctcl/index.cgi/index and the combobox code is specifically located at: http://jeremy.cowgar.com/misctcl/index.cgi/doc/tip/combobox/combobox.tcl .. That will always be my latest source. The source (as of Feb 24, 2010) has been submitted to Tcl/Tk as the default behavior. No action has been taken on it as of this time.
----
[LV] 2010-06-09

In the iwidgets combobox, one had the ability to specified a command to execute when one of the menu items in the dropdown list is selected.
How does one do that with the ttk version of the combobox?


----
!!!!!!
%| [Category Widget] |%
!!!!!!