add a note about changing selection background colour

[wxWidgets.git] / docs / latex / wx / checkbox.tex

\section{\class{wxCheckBox}}\label{wxcheckbox}

A checkbox is a labelled box which by default is either on (checkmark is
visible) or off (no checkmark). Optionally (when the wxCHK\_3STATE style flag
is set) it can have a third state, called the mixed or undetermined state.
Often this is used as a "Does Not Apply" state.

\wxheading{Derived from}

\helpref{wxControl}{wxcontrol}\\
\helpref{wxWindow}{wxwindow}\\
\helpref{wxEvtHandler}{wxevthandler}\\
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/checkbox.h>

\wxheading{Window styles}

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{\windowstyle{wxCHK\_2STATE}}{Create a 2-state checkbox. This is the default.}
\twocolitem{\windowstyle{wxCHK\_3STATE}}{Create a 3-state checkbox.
Not implemented in wxMGL, wxOS2 and wxGTK built against GTK+ 1.2.}
\twocolitem{\windowstyle{wxCHK\_ALLOW\_3RD\_STATE\_FOR\_USER}}{By default a user can't set a 3-state checkbox
to the third state. It can only be done from code. Using this flags allows the user to set the checkbox to the third state by clicking. }
\twocolitem{\windowstyle{wxALIGN\_RIGHT}}{Makes the text appear on the left of the checkbox.}
\end{twocollist}

See also \helpref{window styles overview}{windowstyles}.

\wxheading{Event handling}

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_CHECKBOX(id, func)}}{Process a wxEVT\_COMMAND\_CHECKBOX\_CLICKED event,
when the checkbox is clicked.}
\end{twocollist}

\wxheading{See also}

\helpref{wxRadioButton}{wxradiobutton}, \helpref{wxCommandEvent}{wxcommandevent}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxCheckBox::wxCheckBox}\label{wxcheckboxctor}

\func{}{wxCheckBox}{\void}

Default constructor.

\func{}{wxCheckBox}{\param{wxWindow* }{parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{label}, \param{const wxPoint\& }{pos = wxDefaultPosition},\rtfsp
\param{const wxSize\& }{size = wxDefaultSize}, \param{long}{ style = 0},\rtfsp
\param{const wxValidator\& }{val}, \param{const wxString\& }{name = ``checkBox"}}

Constructor, creating and showing a checkbox.

\wxheading{Parameters}

\docparam{parent}{Parent window. Must not be NULL.}

\docparam{id}{Checkbox identifier. A value of -1 indicates a default value.}

\docparam{label}{Text to be displayed next to the checkbox.}

\docparam{pos}{Checkbox position. If the position (-1, -1) is specified then a default position is chosen.}

\docparam{size}{Checkbox size. If the default size (-1, -1) is specified then a default size is chosen.}

\docparam{style}{Window style. See \helpref{wxCheckBox}{wxcheckbox}.}

\docparam{validator}{Window validator.}

\docparam{name}{Window name.}

\wxheading{See also}

\helpref{wxCheckBox::Create}{wxcheckboxcreate}, \helpref{wxValidator}{wxvalidator}

\membersection{wxCheckBox::\destruct{wxCheckBox}}\label{wxcheckboxdtor}

\func{}{\destruct{wxCheckBox}}{\void}

Destructor, destroying the checkbox.

\membersection{wxCheckBox::Create}\label{wxcheckboxcreate}

\func{bool}{Create}{\param{wxWindow* }{parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{label}, \param{const wxPoint\& }{pos = wxDefaultPosition},\rtfsp
\param{const wxSize\& }{size = wxDefaultSize}, \param{long}{ style = 0},\rtfsp
\param{const wxValidator\& }{val}, \param{const wxString\& }{name = ``checkBox"}}

Creates the checkbox for two-step construction. See \helpref{wxCheckBox::wxCheckBox}{wxcheckboxctor}\rtfsp
for details.

\membersection{wxCheckBox::GetValue}\label{wxcheckboxgetvalue}

\constfunc{bool}{GetValue}{\void}

Gets the state of a 2-state checkbox.

\wxheading{Return value}

Returns \true if it is checked, \false otherwise.

\membersection{wxCheckBox::Get3StateValue}\label{wxcheckboxgetthreestatevalue}

\constfunc{wxCheckBoxState}{Get3StateValue}{\void}

Gets the state of a 3-state checkbox.

\wxheading{Return value}

Returns wxCHK\_UNCHECKED when the checkbox is unchecked, wxCHK\_CHECKED
 when it is checked and wxCHK\_UNDETERMINED when it's in the undetermined
state. Asserts when the function is used with a 2-state checkbox.

\membersection{wxCheckBox::Is3rdStateAllowedForUser}\label{wxcheckboxis3rdstateallowedforuser}

\constfunc{bool}{Is3rdStateAllowedForUser}{\void}

Returns whether or not the user can set the checkbox to the third state.

\wxheading{Return value}

Returns \true if the user can set the third state of this checkbox, \false if it can only be set
programmatically or if it's a 2-state checkbox.

\membersection{wxCheckBox::Is3State}\label{wxcheckboxis3state}

\constfunc{bool}{Is3State}{\void}

Returns whether or not the checkbox is a 3-state checkbox.

\wxheading{Return value}

Returns \true if this checkbox is a 3-state checkbox, \false if it's a 2-state checkbox.

\membersection{wxCheckBox::IsChecked}\label{wxcheckboxischecked}

\constfunc{bool}{IsChecked}{\void}

This is just a maybe more readable synonym for 
\helpref{GetValue}{wxcheckboxgetvalue}: just as the latter, it returns 
\true if the checkbox is checked and \false otherwise.

\membersection{wxCheckBox::SetValue}\label{wxcheckboxsetvalue}

\func{void}{SetValue}{\param{bool}{ state}}

Sets the checkbox to the given state. This does not cause a
wxEVT\_COMMAND\_CHECKBOX\_CLICKED event to get emitted.

\wxheading{Parameters}

\docparam{state}{If \true, the check is on, otherwise it is off.}

\membersection{wxCheckBox::Set3StateValue}\label{wxcheckboxset3statevalue}

\func{void}{Set3StateValue}{\param{const wxCheckBoxState}{ state}}

Sets the checkbox to the given state. This does not cause a
wxEVT\_COMMAND\_CHECKBOX\_CLICKED event to get emitted.

\wxheading{Parameters}

\docparam{state}{Can be one of: wxCHK\_UNCHECKED (Check is off), wxCHK\_CHECKED
 (Check is on) or wxCHK\_UNDETERMINED (Check is mixed). Asserts when the checkbox
 is a 2-state checkbox and setting the state to wxCHK\_UNDETERMINED.}