Some work on GTK focus handling and events.

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

\section{\class{wxScrollEvent}}\label{wxscrollevent}

A scroll event holds information about events sent from stand-alone
scrollbars, spin-buttons and sliders. Note that starting from wxWindows 2.1,
scrolled windows send the \helpref{wxScrollWinEvent}{wxscrollwinevent} which
does not derive from wxCommandEvent, but from wxEvent directly - don't confuse
these two kinds of events and use the event table macros mentioned below only
for the scrollbar-like controls.

\wxheading{Derived from}

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

\wxheading{Include files}

<wx/event.h>

\wxheading{Event table macros}

To process a scroll event, use these event handler macros to direct input to
member functions that take a wxScrollEvent argument. You can use
{\tt EVT\_COMMAND\_SCROLL...} macros with window IDs for when intercepting
scroll events from controls, or {\tt EVT\_SCROLL...} macros without window IDs
for intercepting scroll events from the receiving window - except for this,
the macros behave exactly the same

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_SCROLL(func)}}{Process all scroll events.}
\twocolitem{{\bf EVT\_SCROLL\_TOP(func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-top events.}
\twocolitem{{\bf EVT\_SCROLL\_BOTTOM(func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-bottom events.}
\twocolitem{{\bf EVT\_SCROLL\_LINEUP(func)}}{Process wxEVT\_SCROLL\_LINEUP line up events.}
\twocolitem{{\bf EVT\_SCROLL\_LINEDOWN(func)}}{Process wxEVT\_SCROLL\_LINEDOWN line down events.}
\twocolitem{{\bf EVT\_SCROLL\_PAGEUP(func)}}{Process wxEVT\_SCROLL\_PAGEUP page up events.}
\twocolitem{{\bf EVT\_SCROLL\_PAGEDOWN(func)}}{Process wxEVT\_SCROLL\_PAGEDOWN page down events.}
\twocolitem{{\bf EVT\_SCROLL\_THUMBTRACK(func)}}{Process wxEVT\_SCROLL\_THUMBTRACK thumbtrack events (frequent events
sent as the user drags the thumtrack).}
\twocolitem{{\bf EVT\_SCROLL\_THUMBRELEASE(func)}}{Process wxEVT\_SCROLL\_THUMBRELEASE thumb release events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL(id, func)}}{Process all scroll events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_TOP(id, func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-top events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_BOTTOM(id, func)}}{Process wxEVT\_SCROLL\_TOP scroll-to-bottom events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_LINEUP(id, func)}}{Process wxEVT\_SCROLL\_LINEUP line up events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_LINEDOWN(id, func)}}{Process wxEVT\_SCROLL\_LINEDOWN line down events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_PAGEUP(id, func)}}{Process wxEVT\_SCROLL\_PAGEUP page up events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_PAGEDOWN(id, func)}}{Process wxEVT\_SCROLL\_PAGEDOWN page down events.}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_THUMBTRACK(id, func)}}{Process wxEVT\_SCROLL\_THUMBTRACK thumbtrack events (frequent events
sent as the user drags the thumtrack).}
\twocolitem{{\bf EVT\_COMMAND\_SCROLL\_THUMBRELEASE(func)}}{Process wxEVT\_SCROLL\_THUMBRELEASE thumb release events.}
\end{twocollist}%

\wxheading{Remarks}

Note that unless specifying a scroll control identifier, you will need to test for scrollbar
orientation with \helpref{wxScrollEvent::GetOrientation}{wxscrolleventgetorientation}, since
horizontal and vertical scroll events are processed using the same event handler.

\wxheading{See also}

\helpref{wxScrollBar}{wxscrollbar}, \helpref{wxSlider}{wxslider}, \helpref{wxSpinButton}{wxspinbutton}, \\
\helpref{wxScrollWinEvent}{wxscrollwinevent}, \helpref{Event handling overview}{eventhandlingoverview}

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

\membersection{wxScrollEvent::wxScrollEvent}

\func{}{wxScrollEvent}{\param{WXTYPE }{commandType = 0}, \param{int }{id = 0}, \param{int}{ pos = 0},
\rtfsp\param{int}{ orientation = 0}}

Constructor.

\membersection{wxScrollEvent::GetOrientation}\label{wxscrolleventgetorientation}

\constfunc{int}{GetOrientation}{\void}

Returns wxHORIZONTAL or wxVERTICAL, depending on the orientation of the scrollbar.

\membersection{wxScrollEvent::GetPosition}\label{wxscrolleventgetposition}

\constfunc{int}{GetPosition}{\void}

Returns the position of the scrollbar.