Provided by: tk8.6-doc_8.6.8-4_all bug

NAME

       fontchooser - control font selection dialog

SYNOPSIS

       tk fontchooser configure ?-option value -option value ...?

       tk fontchooser show

       tk fontchooser hide
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DESCRIPTION

       The  tk  fontchooser  command  controls  the  Tk font selection dialog. It uses the native
       platform font selection dialog where available, or a dialog implemented in Tcl otherwise.

       Unlike most of the other Tk dialog commands, tk fontchooser does not return  an  immediate
       result,  as  on  some  platforms  (Mac OS X) the standard font dialog is modeless while on
       others (Windows) it is modal. To accommodate this difference, all  user  interaction  with
       the dialog will be communicated to the caller via callbacks or virtual events.

       The tk fontchooser command can have one of the following forms:

       tk fontchooser configure ?-option value -option value ...?
              Set  or  query  one  or  more  of the configurations options below (analogous to Tk
              widget configuration).

       tk fontchooser show
              Show the font selection dialog. Depending on the platform, may  return  immediately
              or only once the dialog has been withdrawn.

       tk fontchooser hide
              Hide  the  font  selection  dialog  if  it  is  visible  and  cause  any pending tk
              fontchooser show command to return.

CONFIGURATION OPTIONS

       -parent
              Specifies/returns the logical parent window of the font selection  dialog  (similar
              to  the -parent option to other dialogs). The font selection dialog is hidden if it
              is visible when the parent window is destroyed.

       -title Specifies/returns the title of the dialog. Has no effect  on  platforms  where  the
              font selection dialog does not support titles.

       -font  Specifies/returns  the  font  that  is  currently  selected  in the dialog if it is
              visible, or that will be initially selected when the dialog is shown (if  supported
              by the platform). Can be set to the empty string to indicate that no font should be
              selected. Fonts can be specified in  any  form  given  by  the  "FONT  DESCRIPTION"
              section in the font manual page.

       -command
              Specifies/returns  the  command  prefix to be called when a font selection has been
              made by the user. The command prefix is evaluated at the global level after  having
              the  specification  of  the  selected  font  appended.  On platforms where the font
              selection dialog offers the user  control  of  further  font  attributes  (such  as
              color), additional key/value pairs may be appended before evaluation. Can be set to
              the empty string to  indicate  that  no  callback  should  be  invoked.  Fonts  are
              specified  by  a  list  of  form  [3] of the "FONT DESCRIPTION" section in the font
              manual page (i.e. a list of the form {family size style ?style ...?}).

       -visible
              Read-only option that returns a  boolean  indicating  whether  the  font  selection
              dialog is currently visible. Attempting to set this option results in an error.

VIRTUAL EVENTS

       <<TkFontchooserVisibility>>
              Sent  to  the  dialog  parent  whenever the visibility of the font selection dialog
              changes, both as a result  of  user  action  (e.g.  disposing  of  the  dialog  via
              OK/Cancel  button  or close box) and of the tk fontchooser show/hide commands being
              called. Binding scripts can determine the  current  visibility  of  the  dialog  by
              querying the -visible configuration option.

       <<TkFontchooserFontChanged>>
              Sent  to  the  dialog  parent whenever the font selection dialog is visible and the
              selected font  changes,  both  as  a  result  of  user  action  and  of  the  -font
              configuration  option  being  set.  Binding  scripts  can  determine  the currently
              selected font by querying the -font configuration option.

NOTES

       Callers should not expect a result from tk fontchooser show and may not  assume  that  the
       dialog  has  been  withdrawn or closed when the command returns. All user interaction with
       the  dialog  is  communicated  to  the  caller  via  the   -command   callback   and   the
       <<TkFontchooser*>>  virtual  events.   It  is  implementation  dependent  which exact user
       actions result in the callback being called resp. the virtual events being sent. Where  an
       Apply  or  OK  button  is  present  in  the  dialog, that button will trigger the -command
       callback and <<TkFontchooserFontChanged>> virtual event.  On  some  implementations  other
       user  actions  may  also  have  that  effect;  on Mac OS X for instance, the standard font
       selection dialog immediately reflects all user choices to the caller.

       In the presence of multiple widgets intended  to  be  influenced  by  the  font  selection
       dialog, care needs to be taken to correctly handle focus changes: the font selected in the
       dialog should always match the current font of the widget with the focus, and the -command
       callback  should only act on the widget with the focus. The recommended practice is to set
       font dialog -font and -command configuration options in per-widget <FocusIn> handlers (and
       if  necessary  to  unset them - i.e. set to the empty string - in corresponding <FocusOut>
       handlers). This is particularly important for implementers of library code using the  font
       selection dialog, to avoid conflicting with application code that may also want to use the
       dialog.

       Because the font selection dialog is  application-global,  in  the  presence  of  multiple
       interpreters  calling  tk  fontchooser,  only the -command callback set by the interpreter
       that most recently called tk fontchooser configure or tk fontchooser show will be  invoked
       in  response  to  user  action  and  only the -parent set by that interpreter will receive
       <<TkFontchooser*>> virtual events.

       The font dialog implementation may only store (and return) font actual data as  the  value
       of the -font configuration option. This can be an issue when -font is set to a named font,
       if that font is subsequently changed, the font dialog -font option needs to be  set  again
       to ensure its selected font matches the new value of the named font.

EXAMPLE

              proc fontchooserDemo {} {
                  wm title . "Font Chooser Demo"
                  tk fontchooser configure -parent .
                  button .b -command fontchooserToggle -takefocus 0
                  fontchooserVisibility .b
                  bind . <<TkFontchooserVisibility>> \
                          [list fontchooserVisibility .b]
                  foreach w {.t1 .t2} {
                      text $w -width 20 -height 4 -borderwidth 1 -relief solid
                      bind $w <FocusIn> [list fontchooserFocus $w]
                      $w insert end "Text Widget $w"
                  }
                  .t1 configure -font {Courier 14}
                  .t2 configure -font {Times 16}
                  pack .b .t1 .t2; focus .t1
              }
              proc fontchooserToggle {} {
                  tk fontchooser [expr {
                          [tk fontchooser configure -visible] ?
                          "hide" : "show"}]
              }
              proc fontchooserVisibility {w} {
                  $w configure -text [expr {
                          [tk fontchooser configure -visible] ?
                          "Hide Font Dialog" : "Show Font Dialog"}]
              }
              proc fontchooserFocus {w} {
                  tk fontchooser configure -font [$w cget -font] \
                          -command [list fontchooserFontSelection $w]
              }
              proc fontchooserFontSelection {w font args} {
                  $w configure -font [font actual $font]
              }
              fontchooserDemo

SEE ALSO

       font(3tk), tk(3tk)

KEYWORDS

       dialog, font, font selection, font chooser, font panel