wxWidgets/docs/latex/wx/combobox.tex
2006-01-17 18:04:07 +00:00

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\section{\class{wxComboBox}}\label{wxcombobox}
A combobox is like a combination of an edit control and a listbox. It can be
displayed as static list with editable or read-only text field; or a drop-down list with
text field; or a drop-down list without a text field.
A combobox permits a single selection only. Combobox items are numbered from zero.
\wxheading{Derived from}
\helpref{wxControlWithItems}{wxcontrolwithitems}\\
\helpref{wxControl}{wxcontrol}\\
\helpref{wxWindow}{wxwindow}\\
\helpref{wxEvtHandler}{wxevthandler}\\
\helpref{wxObject}{wxobject}
\wxheading{Include files}
<wx/combobox.h>
\wxheading{Window styles}
\begin{twocollist}\itemsep=0pt
\twocolitem{\windowstyle{wxCB\_SIMPLE}}{Creates a combobox with a permanently displayed list. Windows only. }
\twocolitem{\windowstyle{wxCB\_DROPDOWN}}{Creates a combobox with a drop-down list.}
\twocolitem{\windowstyle{wxCB\_READONLY}}{Same as wxCB\_DROPDOWN but only the
strings specified as the combobox choices can be selected, it is impossible to
select (even from a program) a string which is not in the choices list.}
\twocolitem{\windowstyle{wxCB\_SORT}}{Sorts the entries in the list alphabetically.}
\twocolitem{\windowstyle{wxPROCESS\_ENTER}}{The control will generate
the event wxEVT\_COMMAND\_TEXT\_ENTER (otherwise pressing Enter key
is either processed internally by the control or used for navigation between
dialog controls). Windows only.}
\end{twocollist}
See also \helpref{window styles overview}{windowstyles}.
\wxheading{Event handling}
\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_COMBOBOX(id, func)}}{Process a wxEVT\_COMMAND\_COMBOBOX\_SELECTED event,
when an item on the list is selected. Note that calling
\helpref{GetValue}{wxcomboboxgetvalue} returns the new value of selection.}
\twocolitem{{\bf EVT\_TEXT(id, func)}}{Process a wxEVT\_COMMAND\_TEXT\_UPDATED event,
when the combobox text changes.}
\twocolitem{{\bf EVT\_TEXT\_ENTER(id, func)}}{Process a wxEVT\_COMMAND\_TEXT\_ENTER event,
when <RETURN> is pressed in the combobox.}
\end{twocollist}
\wxheading{See also}
\helpref{wxListBox}{wxlistbox}, \helpref{wxTextCtrl}{wxtextctrl}, \helpref{wxChoice}{wxchoice},
\rtfsp\helpref{wxCommandEvent}{wxcommandevent}
\latexignore{\rtfignore{\wxheading{Members}}}
\membersection{wxComboBox::wxComboBox}\label{wxcomboboxctor}
\func{}{wxComboBox}{\void}
Default constructor.
\func{}{wxComboBox}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{value = ``"}, \param{const wxPoint\&}{ pos = wxDefaultPosition}, \param{const wxSize\&}{ size = wxDefaultSize},\rtfsp
\param{int}{ n}, \param{const wxString }{choices[]},\rtfsp
\param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``comboBox"}}
\func{}{wxComboBox}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{value}, \param{const wxPoint\&}{ pos}, \param{const wxSize\&}{ size},\rtfsp
\param{const wxArrayString\& }{choices},\rtfsp
\param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``comboBox"}}
Constructor, creating and showing a combobox.
\wxheading{Parameters}
\docparam{parent}{Parent window. Must not be NULL.}
\docparam{id}{Window identifier. A value of -1 indicates a default value.}
\docparam{value}{Initial selection string. An empty string indicates no selection.}
\docparam{pos}{Window position.}
\docparam{size}{Window size. If the default size (-1, -1) is specified then the window is sized
appropriately.}
\docparam{n}{Number of strings with which to initialise the control.}
\docparam{choices}{An array of strings with which to initialise the control.}
\docparam{style}{Window style. See \helpref{wxComboBox}{wxcombobox}.}
\docparam{validator}{Window validator.}
\docparam{name}{Window name.}
\wxheading{See also}
\helpref{wxComboBox::Create}{wxcomboboxcreate}, \helpref{wxValidator}{wxvalidator}
\pythonnote{The wxComboBox constructor in wxPython reduces the {\tt n}
and {\tt choices} arguments are to a single argument, which is
a list of strings.}
\perlnote{In wxPerl there is just an array reference in place of {\tt n}
and {\tt choices}.}
\membersection{wxComboBox::\destruct{wxComboBox}}\label{wxcomboboxdtor}
\func{}{\destruct{wxComboBox}}{\void}
Destructor, destroying the combobox.
\membersection{wxComboBox::Create}\label{wxcomboboxcreate}
\func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{value = ``"}, \param{const wxPoint\&}{ pos = wxDefaultPosition}, \param{const wxSize\&}{ size = wxDefaultSize},\rtfsp
\param{int}{ n}, \param{const wxString }{choices[]},\rtfsp
\param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``comboBox"}}
\func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{value}, \param{const wxPoint\&}{ pos}, \param{const wxSize\&}{ size},\rtfsp
\param{const wxArrayString\& }{choices},\rtfsp
\param{long}{ style = 0}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``comboBox"}}
Creates the combobox for two-step construction. Derived classes
should call or replace this function. See \helpref{wxComboBox::wxComboBox}{wxcomboboxctor}\rtfsp
for further details.
\membersection{wxComboBox::CanCopy}\label{wxcomboboxcancopy}
\constfunc{bool}{CanCopy}{\void}
Returns true if the combobox is editable and there is a text selection to copy to the clipboard.
Only available on Windows.
\membersection{wxComboBox::CanCut}\label{wxcomboboxcancut}
\constfunc{bool}{CanCut}{\void}
Returns true if the combobox is editable and there is a text selection to copy to the clipboard.
Only available on Windows.
\membersection{wxComboBox::CanPaste}\label{wxcomboboxcanpaste}
\constfunc{bool}{CanPaste}{\void}
Returns true if the combobox is editable and there is text on the clipboard that can be pasted into the
text field. Only available on Windows.
\membersection{wxComboBox::CanRedo}\label{wxcomboboxcanredo}
\constfunc{bool}{CanRedo}{\void}
Returns true if the combobox is editable and the last undo can be redone.
Only available on Windows.
\membersection{wxComboBox::CanUndo}\label{wxcomboboxcanundo}
\constfunc{bool}{CanUndo}{\void}
Returns true if the combobox is editable and the last edit can be undone.
Only available on Windows.
\membersection{wxComboBox::Copy}\label{wxcomboboxcopy}
\func{void}{Copy}{\void}
Copies the selected text to the clipboard.
\membersection{wxComboBox::Cut}\label{wxcomboboxcut}
\func{void}{Cut}{\void}
Copies the selected text to the clipboard and removes the selection.
\membersection{wxComboBox::GetInsertionPoint}\label{wxcomboboxgetinsertionpoint}
\constfunc{long}{GetInsertionPoint}{\void}
Returns the insertion point for the combobox's text field.
\membersection{wxComboBox::GetLastPosition}\label{wxcomboboxgetlastposition}
\constfunc{virtual wxTextPos}{GetLastPosition}{\void}
Returns the last position in the combobox text field.
\membersection{wxComboBox::GetValue}\label{wxcomboboxgetvalue}
\constfunc{wxString}{GetValue}{\void}
Returns the current value in the combobox text field.
\membersection{wxComboBox::Paste}\label{wxcomboboxpaste}
\func{void}{Paste}{\void}
Pastes text from the clipboard to the text field.
\membersection{wxComboBox::Redo}\label{wxcomboboxredo}
\func{void}{Redo}{\void}
Redoes the last undo in the text field. Windows only.
\membersection{wxComboBox::Replace}\label{wxcomboboxreplace}
\func{void}{Replace}{\param{long}{ from}, \param{long}{ to}, \param{const wxString\& }{text}}
Replaces the text between two positions with the given text, in the combobox text field.
\wxheading{Parameters}
\docparam{from}{The first position.}
\docparam{to}{The second position.}
\docparam{text}{The text to insert.}
\membersection{wxComboBox::Remove}\label{wxcomboboxremove}
\func{void}{Remove}{\param{long}{ from}, \param{long}{ to}}
Removes the text between the two positions in the combobox text field.
\wxheading{Parameters}
\docparam{from}{The first position.}
\docparam{to}{The last position.}
\membersection{wxComboBox::SetInsertionPoint}\label{wxcomboboxsetinsertionpoint}
\func{void}{SetInsertionPoint}{\param{long}{ pos}}
Sets the insertion point in the combobox text field.
\wxheading{Parameters}
\docparam{pos}{The new insertion point.}
\membersection{wxComboBox::SetInsertionPointEnd}\label{wxcomboboxsetinsertionpointend}
\func{void}{SetInsertionPointEnd}{\void}
Sets the insertion point at the end of the combobox text field.
\membersection{wxComboBox::SetSelection}\label{wxcomboboxsetselection}
\func{void}{SetSelection}{\param{long}{ from}, \param{long}{ to}}
Selects the text between the two positions, in the combobox text field.
\wxheading{Parameters}
\docparam{from}{The first position.}
\docparam{to}{The second position.}
\pythonnote{This method is called {\tt SetMark} in wxPython, {\tt SetSelection}
name is kept for
\helpref{wxControlWithItems::SetSelection}{wxcontrolwithitemssetselection}.}
\membersection{wxComboBox::SetValue}\label{wxcomboboxsetvalue}
\func{void}{SetValue}{\param{const wxString\& }{text}}
Sets the text for the combobox text field.
{\bf NB:} For a combobox with {\tt wxCB\_READONLY} style the string must be in
the combobox choices list, otherwise the call to SetValue() is ignored.
\wxheading{Parameters}
\docparam{text}{The text to set.}
\membersection{wxComboBox::Undo}\label{wxcomboboxundo}
\func{void}{Undo}{\void}
Undoes the last edit in the text field. Windows only.