docs/latex/wx/listbox.tex

   1 \section{\class{wxListBox}}\label{wxlistbox}
   2
   3 A listbox is used to select one or more of a list of strings. The
   4 strings are displayed in a scrolling box, with the selected string(s)
   5 marked in reverse video. A listbox can be single selection (if an item
   6 is selected, the previous selection is removed) or multiple selection
   7 (clicking an item toggles the item on or off independently of other
   8 selections).
   9
  10 List box elements are numbered from zero. Their number is limited in
  11 some platforms (e.g. ca. 2000 on GTK).
  12
  13 A listbox callback gets an event wxEVT\_COMMAND\_LISTBOX\_SELECT for single clicks, and
  14 wxEVT\_COMMAND\_LISTBOX\_DOUBLE\_CLICKED for double clicks.
  15
  16 \wxheading{Derived from}
  17
  18 \helpref{wxControlWithItems}{wxcontrolwithitems}\\
  19 \helpref{wxControl}{wxcontrol}\\
  20 \helpref{wxWindow}{wxwindow}\\
  21 \helpref{wxEvtHandler}{wxevthandler}\\
  22 \helpref{wxObject}{wxobject}
  23
  24 \wxheading{Include files}
  25
  26 <wx/listbox.h>
  27
  28 \wxheading{Window styles}
  29
  30 \twocolwidtha{5cm}%
  31 \begin{twocollist}\itemsep=0pt
  32 \twocolitem{\windowstyle{wxLB\_SINGLE}}{Single-selection list.}
  33 \twocolitem{\windowstyle{wxLB\_MULTIPLE}}{Multiple-selection list: the user can toggle multiple
  34 items on and off.}
  35 \twocolitem{\windowstyle{wxLB\_EXTENDED}}{Extended-selection list: the user can
  36 select multiple items using the SHIFT key and the mouse or special key combinations.}
  37 \twocolitem{\windowstyle{wxLB\_HSCROLL}}{Create horizontal scrollbar if contents are too wide (Windows only).}
  38 \twocolitem{\windowstyle{wxLB\_ALWAYS\_SB}}{Always show a vertical scrollbar.}
  39 \twocolitem{\windowstyle{wxLB\_NEEDED\_SB}}{Only create a vertical scrollbar if needed.}
  40 \twocolitem{\windowstyle{wxLB\_SORT}}{The listbox contents are sorted in alphabetical order.}
  41 \end{twocollist}
  42
  43 Note that {\tt wxLB\_SINGLE}, {\tt wxLB\_MULTIPLE} and {\tt wxLB\_EXTENDED}
  44 styles are mutually exclusive and you can specify at most one of them (single
  45 selection is the default).
  46
  47 See also \helpref{window styles overview}{windowstyles}.
  48
  49 \wxheading{Event handling}
  50
  51 \twocolwidtha{7cm}
  52 \begin{twocollist}\itemsep=0pt
  53 \twocolitem{{\bf EVT\_LISTBOX(id, func)}}{Process a wxEVT\_COMMAND\_LISTBOX\_SELECTED event,
  54 when an item on the list is selected.}
  55 \twocolitem{{\bf EVT\_LISTBOX\_DCLICK(id, func)}}{Process a wxEVT\_COMMAND\_LISTBOX\_DOUBLECLICKED event,
  56 when the listbox is double-clicked.}
  57 \end{twocollist}
  58
  59 \wxheading{See also}
  60
  61 \helpref{wxChoice}{wxchoice}, \helpref{wxComboBox}{wxcombobox}, \helpref{wxListCtrl}{wxlistctrl},
  62 \rtfsp\helpref{wxCommandEvent}{wxcommandevent}
  63
  64 \latexignore{\rtfignore{\wxheading{Members}}}
  65
  66 \membersection{wxListBox::wxListBox}\label{wxlistboxconstr}
  67
  68 \func{}{wxListBox}{\void}
  69
  70 Default constructor.
  71
  72 \func{}{wxListBox}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
  73 \param{const wxPoint\&}{ pos = wxDefaultPosition}, \param{const wxSize\&}{ size = wxDefaultSize},\rtfsp
  74 \param{int}{ n}, \param{const wxString }{choices[] = NULL},\rtfsp
  75 \param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``listBox"}}
  76
  77 Constructor, creating and showing a list box.
  78
  79 \wxheading{Parameters}
  80
  81 \docparam{parent}{Parent window. Must not be NULL.}
  82
  83 \docparam{id}{Window identifier. A value of -1 indicates a default value.}
  84
  85 \docparam{pos}{Window position.}
  86
  87 \docparam{size}{Window size. If the default size (-1, -1) is specified then the window is sized
  88 appropriately.}
  89
  90 \docparam{n}{Number of strings with which to initialise the control.}
  91
  92 \docparam{choices}{An array of strings with which to initialise the control.}
  93
  94 \docparam{style}{Window style. See \helpref{wxListBox}{wxlistbox}.}
  95
  96 \docparam{validator}{Window validator.}
  97
  98 \docparam{name}{Window name.}
  99
 100 \wxheading{See also}
 101
 102 \helpref{wxListBox::Create}{wxlistboxcreate}, \helpref{wxValidator}{wxvalidator}
 103
 104 \pythonnote{The wxListBox constructor in wxPython reduces the {\tt n}
 105 and {\tt choices} arguments are to a single argument, which is
 106 a list of strings.}
 107
 108 \perlnote{In wxPerl there is just an array reference in place of {\tt n}
 109 and {\tt choices}.}
 110
 111 \membersection{wxListBox::\destruct{wxListBox}}
 112
 113 \func{void}{\destruct{wxListBox}}{\void}
 114
 115 Destructor, destroying the list box.
 116
 117 \membersection{wxListBox::Create}\label{wxlistboxcreate}
 118
 119 \func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
 120 \param{const wxPoint\&}{ pos = wxDefaultPosition}, \param{const wxSize\&}{ size = wxDefaultSize},\rtfsp
 121 \param{int}{ n}, \param{const wxString }{choices[] = NULL},\rtfsp
 122 \param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``listBox"}}
 123
 124 Creates the listbox for two-step construction. See \helpref{wxListBox::wxListBox}{wxlistboxconstr}\rtfsp
 125 for further details.
 126
 127 \membersection{wxListBox::Deselect}\label{wxlistboxdeselect}
 128
 129 \func{void}{Deselect}{\param{int}{ n}}
 130
 131 Deselects an item in the list box.
 132
 133 \wxheading{Parameters}
 134
 135 \docparam{n}{The zero-based item to deselect.}
 136
 137 \wxheading{Remarks}
 138
 139 This applies to multiple selection listboxes only.
 140
 141 \membersection{wxListBox::GetSelections}\label{wxlistboxgetselections}
 142
 143 \constfunc{int}{GetSelections}{\param{wxArrayInt\& }{selections}}
 144
 145 Fill an array of ints with the positions of the currently selected items.
 146
 147 \wxheading{Parameters}
 148
 149 \docparam{selections}{A reference to an wxArrayInt instance that is used to store the result of the query.}
 150
 151 \wxheading{Return value}
 152
 153 The number of selections.
 154
 155 \wxheading{Remarks}
 156
 157 Use this with a multiple selection listbox.
 158
 159 \wxheading{See also}
 160
 161 \helpref{wxControlWithItems::GetSelection}{wxcontrolwithitemsgetselection},\rtfsp
 162 \helpref{wxControlWithItems::GetStringSelection}{wxcontrolwithitemsgetstringselection},\rtfsp
 163 \helpref{wxControlWithItems::SetSelection}{wxcontrolwithitemssetselection}
 164
 165 \pythonnote{The wxPython version of this method takes no parameters
 166 and returns a tuple of the selected items.}
 167
 168 \perlnote{In wxPerl this method takes no parameters and return the
 169 selected items as a list.}
 170
 171 \membersection{wxListBox::InsertItems}\label{wxlistboxinsertitems}
 172
 173 \func{void}{InsertItems}{\param{int}{ nItems}, \param{const wxString}{ *items}, \param{int}{ pos}}
 174
 175 Insert the given number of strings before the specified position.
 176
 177 \wxheading{Parameters}
 178
 179 \docparam{nItems}{Number of items in the array {\it items}}
 180
 181 \docparam{items}{Labels of items to be inserted}
 182
 183 \docparam{pos}{Position before which to insert the items: for example, if {\it pos} is 0 the items
 184 will be inserted in the beginning of the listbox}
 185
 186 \pythonnote{The first two parameters are collapsed into a single
 187 parameter for wxPython, which is a list of strings.}
 188
 189 \perlnote{In wxPerl there is just an array reference in place of {\tt nItems}
 190 and {\tt items}.}
 191
 192 \membersection{wxListBox::Selected}\label{wxlistboxselected}
 193
 194 \constfunc{bool}{Selected}{\param{int}{ n}}
 195
 196 Determines whether an item is selected.
 197
 198 \wxheading{Parameters}
 199
 200 \docparam{n}{The zero-based item index.}
 201
 202 \wxheading{Return value}
 203
 204 TRUE if the given item is selected, FALSE otherwise.
 205
 206 \membersection{wxListBox::Set}\label{wxlistboxset}
 207
 208 \func{void}{Set}{\param{int}{ n}, \param{const wxString*}{ choices}, \param{void}{ **clientData = {\tt NULL}}}
 209
 210 \func{void}{Set}{\param{const wxArrayString\&}{ choices}, \param{void}{ **clientData = {\tt NULL}}}
 211
 212 Clears the list box and adds the given strings to it.
 213
 214 \wxheading{Parameters}
 215
 216 \docparam{n}{The number of strings to set.}
 217
 218 \docparam{choices}{An array of strings to set.}
 219
 220 \docparam{clientData}{Options array of client data pointers}
 221
 222 \wxheading{Remarks}
 223
 224 You may free the array from the calling program after this function has been
 225 called.
 226
 227 \membersection{wxListBox::SetFirstItem}\label{wxlistboxsetfirstitem}
 228
 229 \func{void}{SetFirstItem}{\param{int}{ n}}
 230
 231 \func{void}{SetFirstItem}{\param{const wxString\& }{string}}
 232
 233 Set the specified item to be the first visible item. Windows only.
 234
 235 \wxheading{Parameters}
 236
 237 \docparam{n}{The zero-based item index.}
 238
 239 \docparam{string}{The string that should be visible.}
 240