combobox.man

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

              See XXmmTTeexxttFFiieellddGGeettSSeelleeccttiioonnPPoossiittiioonn.


       cchhaarr **XXmmCCoommbbooBBooxxGGeettSSttrriinngg((WWiiddggeett ww))
              See XXmmTTeexxttFFiieellddGGeettSSttrriinngg.


       vvooiidd XXmmCCoommbbooBBooxxIInnsseerrtt((WWiiddggeett  ww,,  XXmmTTeexxttPPoossiittiioonn
              ppoossiittiioonn,,  cchhaarr **vvaalluuee))
              See XXmmTTeexxttFFiieellddIInnsseerrtt.


       BBoooolleeaann XXmmCCoommbbooBBooxxPPaassttee((WWiiddggeett ww))
              See XXmmTTeexxttFFiieellddPPaassttee.


       BBoooolleeaann XXmmCCoommbbooBBooxxRReemmoovvee((WWiiddggeett ww))
              See XXmmTTeexxttFFiieellddRReemmoovvee.


       vvooiidd   XXmmCCoommbbooBBooxxRReeppllaaccee((WWiiddggeett   ww,,   XXmmTTeexxttPPoossiittiioonn
              ffrroomm__ppooss,, XXmmTTeexxttPPoossiittiioonn ttoo__ppooss,, cchhaarr **vvaalluuee))
              See XXmmTTeexxttFFiieellddRReeppllaaccee.


       vvooiidd XXmmCCoommbbooBBooxxSSeettAAddddMMooddee((WWiiddggeett ww,, BBoooolleeaann ssttaattee))
              See XXmmTTeexxttFFiieellddSSeettAAddddMMooddee.


       vvooiidd  XXmmCCoommbbooBBooxxSSeettHHiigghhlliigghhtt((WWiiddggeett   ww,,   XXmmTTeexxttPPoossiittiioonn
              lleefftt,, XXmmTTeexxttPPoossiittiioonn rriigghhtt,, XXmmHHiigghhlliigghhttMMooddee mmooddee))
              See XXmmTTeexxttFFiieellddSSeettHHiigghhlliigghhtt.


       vvooiidd  XXmmCCoommbbooBBooxxSSeettIInnsseerrttiioonnPPoossiittiioonn((WWiiddggeett   ww,,
              XXmmTTeexxttPPoossiittiioonn ppoossiittiioonn))
              See XXmmTTeexxttFFiieellddSSeettIInnsseerrttiioonnPPoossiittiioonn.


       vvooiidd XXmmCCoommbbooBBooxxSSeettMMaaxxLLeennggtthh((WWiiddggeett ww,, iinntt mmaaxx__lleennggtthh))
              See XXmmTTeexxttFFiieellddSSeettMMaaxxLLeennggtthh.






Version 1.31              20 March 1995                        17





XmComboBox(3Xm)        Harry's Motif Tools        XmComboBox(3Xm)


       vvooiidd  XXmmCCoommbbooBBooxxSSeettSSeelleeccttiioonn((WWiiddggeett  ww,,   XXmmTTeexxttPPoossiittiioonn
              ffiirrsstt,, XXmmTTeexxttPPoossiittiioonn llaasstt,, TTiimmee ttiimmee))
              See XXmmTTeexxttFFiieellddSSeettSSeelleeccttiioonn.


       vvooiidd XXmmCCoommbbooBBooxxSSeettSSttrriinngg((WWiiddggeett ww,, cchhaarr **vvaalluuee))
              At least Motif 1.1 contains a very anoying bug.  If
              you try to set the contents of an XmTextField to an
              empty string (""), you'll get garbage, when  asking
              the  XmTextField  for its contents afterwards. This
              interface function provides a work around. Also see
              XXmmTTeexxttFFiieellddSSeettSSttrriinngg.


       vvooiidd XXmmCCoommbbooBBooxxSShhoowwPPoossiittiioonn((WWiiddggeett ww,, XXmmTTeexxttPPoossiittiioonn ppoossii--
              ttiioonn))
              See XXmmTTeexxttFFiieellddSShhoowwPPoossiittiioonn.


     TThhee DDiisslliikkeedd KKeeyybbooaarrdd FFooccuuss
       Now I'll  annotate  a  somewhat  tricky  subject.  If  the
       resource  XXmmNNppeerrssiisstteennttDDrrooppDDoowwnn  defaults  to  its initial
       value of FFaallssee, one can observe the following effect (this
       may be annoying).

       When the user drops down the list and then moves the mouse
       cursor out of the window where the combo box  resides  in,
       the  list  will be hidden. This is because the widget lost
       the keyboard focus. Some users are irritated because  they
       didn't  expect  that behavior, because they just moved the
       mouse to get it out of the way. If your  window  manager's
       focus  policy  is  "pointer  focus", i.e.  if you move the
       pointer into another window, that  window  will  automati-
       cally  get  the keyboard focus. On the other hand, if your
       window manager's focus policy is "explicit", you  have  to
       move  the  pointer  into  another window and click a mouse
       button to give that window the  keyboard  focus.  This  is
       often  referred  to  as  the  "click-to-type"  method.  In
       "explicit" mode, you will never see  the  list's  annoying
       behavior.

       To  bypass  this behavior on some window managers a really
       dirty hack was used. The user can activate that  hack,  if
       he sets XXmmNNppeerrssiisstteennttDDrrooppDDoowwnn to TTrruuee in the application's
       resources. Sorry, on some window managers  this  will  not
       fix the annoying behavior.

       Try  it  if  you  like  -  but  don't complain at me if it
       doesn't work as expected. But at least it  worked  on  the
       author's machine: a cute little SGI Indigo running 4dwm as
       the window manager.

       On some other window  managers  like  twm  you  will  face
       another problem: the list gets hidden as soon as the mouse



Version 1.31              20 March 1995                        18





XmComboBox(3Xm)        Harry's Motif Tools        XmComboBox(3Xm)


       cursor enters the list. Try  to  set  XXmmNNttwwmmHHaannddlliinnggOOnn  to
       TTrruuee.  This resource will also work with other window man-
       agers.


     CCrreeaattiinngg aa CCoommbbooBBooxx
       Using the combo box in your own  programs  is  easy.  Just
       create  the  widget  with one of the innumerable X toolkit
       functions (like  XXttCCrreeaatteeMMaannaaggeeddWWiiddggeett  or  XXttVVaaCCrreeaatteeMMaann--
       aaggeeddWWiiddggeett).


       Specify as the widget class xmComboBoxWidgetClass - that's
       all. There is also a so-called creation convenience  func-
       tion  called XXmmCCrreeaatteeCCoommbbooBBooxx, but it isn't really needed.

       WWiiddggeett XXmmCCrreeaatteeCCoommbbooBBooxx((_p_a_r_e_n_t_, _n_a_m_e_, _a_r_g_l_i_s_t_, _a_r_g_c_o_u_n_t))
         WWiiddggeett         _p_a_r_e_n_t;
         SSttrriinngg         _n_a_m_e;
         AArrggLLiisstt        _a_r_g_l_i_s_t;
         CCaarrddiinnaall       _a_r_g_c_o_u_n_t;

       Somewhere in your program you'll need something  like  the
       following code fragment:


            Widget ComboBox;

            ComboBox = XtVaCreateManagedWidget("combobox",
                           xmComboBoxWidgetClass, Parent,
                           XmNeditable, True or False,
                           other Resources...
                           NULL);


       Setting  the resource XXmmNNeeddiittaabbllee is not absolutely neces-
       sary, but it's better to do so.

       After creation, items can be added to the combo box's list
       by   means   of  interface  functions  like  XXmmCCoommbbooBBooxxAAdd--
       ddIItteemm((......)).  Which item the user selected  can  be  deter-
       mined by calling XXmmCCoommbbooBBooxxGGeettSSttrriinngg((......)).


       If  you  want  to  preselect  an  item  (that is setting a
       default item to the input field of the combo box) you  can
       use  several convenience functions.  On a combo box with a
       non editable input field there are two ways to  select  an
       item:


            XmComboBoxSelectPos(ComboBox, item #, False);

       or:



Version 1.31              20 March 1995                        19





XmComboBox(3Xm)        Harry's Motif Tools        XmComboBox(3Xm)


            XmComboBoxSelectItem(ComboBox, itemString, False);

       The  third parameter in these two function calls indicates
       whether the XXmmNNsseelleeccttiioonnCCaallllbbaacckk  should  be  called.  The
       only  difference  between these functions is the first one
       is expecting an item number whereas the second one expects
       a  XmString. The list is then searched for this string and
       if it is found the input field will be updated.

       On a combo box with XXmmNNeeddiittaabbllee set to  TTrruuee  use  another
       function:

            XmComboBoxSetString(ComboBox, string);

       This  sets the contents of the text input field to string.



BBUUGGSS
       Not more than currently available in Motif 1.2.3 or  Motif
       1.2.4,  but  less  than in the upcomming Motif 2.0. Report
       bugs to [e-mail]. Include a thoroughly
       description,  and say which version of the ComboBox widget
       you are using.



CCOOPPYYRRIIGGHHTT
       Copyright 1993, 1994 Harald Albrecht.

       The ComboBox widget is free software; you can redistribute
       it  and/or  modify  it  under the terms of the GNU General
       Public License as published by the Free  Software  Founda-
       tion; either version 2, or (at your option) any later ver-
       sion.



AAVVAAIILLAABBIILLIITTYY
       The most recent released version of the ComboBox widget is
       always available for anonymous ftp from either

              ftp.x.org (198.112.44.100)
              /contrib/widgets/motif/ComboBox

       or from

              ftp.informatik.rwth-aachen.de (137.226.112.172)
              /pub/packages/ComboBox



AAUUTTHHOORR
       Author of Software & Documentation:



Version 1.31              20 March 1995                        20





XmComboBox(3Xm)        Harry's Motif Tools        XmComboBox(3Xm)


              Harald Albrecht
              Institut fuer Geometrie und Praktische Mathematik
              RWTH Aachen, Bundesrepublik Deutschland
              e-mail: [e-mail]

       English Documentation:
              Chris Marotz
              Sterling Software ITD
              e-mail: [e-mail]



RREELLAATTEEDD IINNFFOORRMMAATTIIOONN