corrected access to NULL parameters in wxGetOsVersion

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

\section{\class{wxListEvent}}\label{wxlistevent}

A list event holds information about events associated with wxListCtrl objects.

\wxheading{Derived from}

\helpref{wxNotifyEvent}{wxnotifyevent}\\
\helpref{wxCommandEvent}{wxcommandevent}\\
\helpref{wxEvent}{wxevent}\\
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/listctrl.h>

\wxheading{Event table macros}

To process input from a list control, use these event handler macros to direct input to member
functions that take a wxListEvent argument.

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_LIST\_BEGIN\_DRAG(id, func)}}{Begin dragging with the left mouse button.}
\twocolitem{{\bf EVT\_LIST\_BEGIN\_RDRAG(id, func)}}{Begin dragging with the right mouse button.}
\twocolitem{{\bf EVT\_LIST\_BEGIN\_LABEL\_EDIT(id, func)}}{Begin editing a label. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_LIST\_END\_LABEL\_EDIT(id, func)}}{Finish editing a label. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_LIST\_DELETE\_ITEM(id, func)}}{Delete an item.}
\twocolitem{{\bf EVT\_LIST\_DELETE\_ALL\_ITEMS(id, func)}}{Delete all items.}
%\twocolitem{{\bf EVT\_LIST\_GET\_INFO(id, func)}}{Request information from the application, usually the item text.}
%\twocolitem{{\bf EVT\_LIST\_SET\_INFO(id, func)}}{Information is being supplied (not implemented).}
\twocolitem{{\bf EVT\_LIST\_ITEM\_SELECTED(id, func)}}{The item has been selected.}
\twocolitem{{\bf EVT\_LIST\_ITEM\_DESELECTED(id, func)}}{The item has been deselected.}
\twocolitem{{\bf EVT\_LIST\_ITEM\_ACTIVATED(id, func)}}{The item has been activated (ENTER or double click).}
\twocolitem{{\bf EVT\_LIST\_ITEM\_RIGHT\_CLICK(id, func)}}{An item has been right-clicked.}
\twocolitem{{\bf EVT\_LIST\_KEY\_DOWN(id, func)}}{A key has been pressed.}
\twocolitem{{\bf EVT\_LIST\_INSERT\_ITEM(id, func)}}{An item has been inserted.}
\twocolitem{{\bf EVT\_LIST\_COL\_CLICK(id, func)}}{A column ({\bf m\_col}) has been left-clicked.}
\twocolitem{{\bf EVT\_LIST\_COL\_RIGHT\_CLICK(id, func)}}{A column ({\bf m\_col}) has been right-clicked.}
\twocolitem{{\bf EVT\_LIST\_COL\_BEGIN\_DRAG(id, func)}}{The user started resizing a column - can be vetoed.}
\twocolitem{{\bf EVT\_LIST\_COL\_DRAGGING(id, func)}}{The divider between columns is being dragged.}
\twocolitem{{\bf EVT\_LIST\_COL\_END\_DRAG(id, func)}}{A column has been resized by the user.}
\twocolitem{{\bf EVT\_LIST\_CACHE\_HINT(id, func)}}{Prepare cache for a virtual list control}
\end{twocollist}%

\wxheading{See also}

\helpref{wxListCtrl}{wxlistctrl}

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

\membersection{wxListEvent::wxListEvent}

\func{}{wxListEvent}{\param{WXTYPE }{commandType = 0}, \param{int }{id = 0}}

Constructor.

\membersection{wxListEvent::GetCacheFrom}\label{wxlisteventgetcachefrom}

\constfunc{long}{GetCacheFrom}{\void}

For {\tt EVT\_LIST\_CACHE\_HINT} event only: return the first item which the
list control advises us to cache.

\membersection{wxListEvent::GetCacheTo}\label{wxlisteventgetcacheto}

\constfunc{long}{GetCacheTo}{\void}

For {\tt EVT\_LIST\_CACHE\_HINT} event only: return the last item (inclusive)
which the list control advises us to cache.

\membersection{wxListEvent::GetCode}\label{wxlisteventgetcode}

\constfunc{int}{GetCode}{\void}

Key code if the event is a keypress event.

\membersection{wxListEvent::GetIndex}\label{wxlisteventgetindex}

\constfunc{long}{GetIndex}{\void}

The item index.

\membersection{wxListEvent::GetColumn}\label{wxlisteventgetcolumn}

\constfunc{int}{GetColumn}{\void}

The column position: it is only used with {\tt COL} events. For the column
dragging events, it is the column to the left of the divider being dragged, for
the column click events it may be $-1$ if the user clicked in the list control
header outside any column.

\membersection{wxListEvent::Cancelled}\label{wxlisteventcancelled}

\constfunc{bool}{Cancelled}{\void}

TRUE if this event is an end edit event and the user cancelled the edit.

\membersection{wxListEvent::GetPoint}\label{wxlisteventgetpoint}

\constfunc{wxPoint}{GetPoint}{\void}

The position of the mouse pointer if the event is a drag event.


\membersection{wxListEvent::GetLabel}\label{wxlisteventgetlabel}

\constfunc{const wxString\&}{GetLabel}{\void}

The label.

\membersection{wxListEvent::GetText}\label{wxlisteventgettext}

\constfunc{const wxString\&}{GetText}{\void}

The text.

\membersection{wxListEvent::GetImage}\label{wxlisteventgetimage}

\constfunc{int}{GetImage}{\void}

The image.

\membersection{wxListEvent::GetData}\label{wxlisteventgetdata}

\constfunc{long}{GetData}{\void}

The data.

\membersection{wxListEvent::GetMask}\label{wxlisteventgetmask}

\constfunc{long}{GetMask}{\void}

The mask.

\membersection{wxListEvent::GetItem}\label{wxlisteventgetitem}

\constfunc{const wxListItem\&}{GetItem}{\void}

An item object, used by some events. See also \helpref{wxListCtrl::SetItem}{wxlistctrlsetitem}.