\section{\class{wxMouseEvent}}\label{wxmouseevent}
-This event class contains information about mouse events.
-See \helpref{wxWindow::OnMouseEvent}{wxwindowonmouseevent}.
+This event class contains information about the events generated by the mouse:
+they include mouse buttons press and release events and mouse move events.
-{\bf NB: } Note that under Windows mouse enter and leave events are not natively supported
+All mouse events involving the buttons use $1$ for the left mouse button, $2$
+for the middle one and $3$ for the right one. Note that not all mice have
+a middle button so a portable application should avoid relying on the events
+from it.
+
+{\bf NB:} Note that under Windows mouse enter and leave events are not natively supported
by the system but are generated by wxWindows itself. This has several
drawbacks: the LEAVE\_WINDOW event might be received some time after the mouse
left the window and the state variables for it may have changed during this
time.
+{\bf NB:} Note the difference between methods like
+\helpref{LeftDown}{wxmouseeventleftdown} and
+\helpref{LeftIsDown}{wxmouseeventleftisdown}: the format returns {\tt TRUE}
+when the event corresponds to the left mouse button click while the latter
+returns {\tt TRUE} if the left mouse button is currently being pressed. For
+example, when the user is dragging the mouse you can use
+\helpref{LeftIsDown}{wxmouseeventleftisdown} to test
+whether the left mouse button is (still) depressed. Also, by convention, if
+\helpref{LeftDown}{wxmouseeventleftdown} returns {\tt TRUE},
+\helpref{LeftIsDown}{wxmouseeventleftisdown} will also return {\tt TRUE} in
+wxWindows whatever the underlying GUI behaviour is (which is
+platform-dependent). The same applies, of course, to other mouse buttons as
+well.
+
\wxheading{Derived from}
\helpref{wxEvent}{wxevent}
\twocolitem{{\bf EVT\_MOTION(func)}}{Process a wxEVT\_MOTION event.}
\twocolitem{{\bf EVT\_ENTER\_WINDOW(func)}}{Process a wxEVT\_ENTER\_WINDOW event.}
\twocolitem{{\bf EVT\_LEAVE\_WINDOW(func)}}{Process a wxEVT\_LEAVE\_WINDOW event.}
+\twocolitem{{\bf EVT\_MOUSEWHEEL(func)}}{Process a wxEVT\_MOUSEWHEEL event.}
\twocolitem{{\bf EVT\_MOUSE\_EVENTS(func)}}{Process all mouse events.}
\end{twocollist}%
TRUE if the right mouse button is currently pressed down.
-\membersection{wxMouseEvent::m\_leftDown}
-
-\member{bool}{m\_leftDown}
-
-TRUE if the left mouse button is currently pressed down.
-
\membersection{wxMouseEvent::m\_metaDown}
\member{bool}{m\_metaDown}
Y-coordinate of the event.
+\membersection{wxMouseEvent::m\_wheelRotation}
+
+\member{int}{m\_wheelRotation}
+
+The distance the mouse wheel is rotated.
+
+\membersection{wxMouseEvent::m\_wheelDelta}
+
+\member{int}{m\_wheelDelta}
+
+The wheel delta, normally 120.
+
+\membersection{wxMouseEvent::m\_linesPerAction}
+
+\member{int}{m\_linesPerAction}
+
+The configured number of lines (or whatever) to be scrolled per wheel
+action.
+
+
\membersection{wxMouseEvent::wxMouseEvent}
\func{}{wxMouseEvent}{\param{WXTYPE}{ mouseEventType = 0}, \param{int}{ id = 0}}
\item {\bf wxEVT\_RIGHT\_UP}
\item {\bf wxEVT\_RIGHT\_DCLICK}
\item {\bf wxEVT\_MOTION}
+\item {\bf wxEVT\_MOUSEWHEEL}
\end{itemize}
\membersection{wxMouseEvent::AltDown}
values of {\it button} are 1, 2 or 3 for left, middle and right
buttons respectively.
-Not all mice have middle buttons so a portable application should avoid
-this one.
-
\membersection{wxMouseEvent::ButtonDClick}\label{buttondclick}
\func{bool}{ButtonDClick}{\param{int}{ but = -1}}
See also \helpref{wxMouseEvent::Leaving}{wxmouseeventleaving}.
+\membersection{wxMouseEvent::GetButton}\label{wxmouseeventgetbutton}
+
+\constfunc{int}{GetButton}{\void}
+
+Returns the mouse button which generated this event or $-1$ if no button is
+involved (for mouse move, enter or leave event, for example). The value $1$ is
+returned for the left button down, up and double click events, $2$ and $3$ for
+the same events for the middle and the right buttons respectively.
+
\membersection{wxMouseEvent::GetPosition}\label{wxmouseeventgetposition}
\constfunc{wxPoint}{GetPosition}{\void}
Returns the logical mouse position in pixels (i.e. translated according to the
translation set for the DC, which usually indicates that the window has been scrolled).
+
+\membersection{wxMouseEvent::GetLinesPerAction}\label{wxmouseeventgetlinesperaction}
+
+\constfunc{int}{GetLinesPerAction}{\void}
+
+Returns the configured number of lines (or whatever) to be scrolled per
+wheel action. Defaults to three.
+
+\membersection{wxMouseEvent::GetWheelRotation}\label{wxmouseeventgetwheelrotation}
+
+\constfunc{int}{GetWheelRotation}{\void}
+
+Get wheel rotation, positive or negative indicates direction of
+rotation. Current devices all send an event when rotation is equal to
++/-WheelDelta, but this allows for finer resolution devices to be
+created in the future. Because of this you shouldn't assume that one
+event is equal to 1 line or whatever, but you should be able to either
+do partial line scrolling or wait until +/-WheelDelta rotation values
+have been accumulated before scrolling.
+
+\membersection{wxMouseEvent::GetWheelDelta}\label{wxmouseeventgetwheeldelta}
+
+\constfunc{int}{GetWheelDelta}{\void}
+
+Get wheel delta, normally 120. This is the threshold for action to be
+taken, and one such action (for example, scrolling one increment)
+should occur for each delta.
+
\membersection{wxMouseEvent::GetX}\label{wxmouseeventgetx}
\constfunc{long}{GetX}{\void}
Returns TRUE if the left mouse button changed to down.
-\membersection{wxMouseEvent::LeftIsDown}
+\membersection{wxMouseEvent::LeftIsDown}\label{wxmouseeventleftisdown}
\constfunc{bool}{LeftIsDown}{\void}
Returns TRUE if the left mouse button is currently down, independent
of the current event type.
-Please notice that it is {\bf not} the same as
+Please notice that it is {\bf not} the same as
\helpref{LeftDown}{wxmouseeventleftdown} which returns TRUE if the left mouse
button was just pressed. Rather, it describes the state of the mouse button
before the event happened.
Returns TRUE if the middle mouse button changed to down.
-\membersection{wxMouseEvent::MiddleIsDown}
+\membersection{wxMouseEvent::MiddleIsDown}\label{wxmouseeventmiddleisdown}
\constfunc{bool}{MiddleIsDown}{\void}
Returns TRUE if the right mouse button changed to down.
-\membersection{wxMouseEvent::RightIsDown}
+\membersection{wxMouseEvent::RightIsDown}\label{wxmouseeventrightisdown}
\constfunc{bool}{RightIsDown}{\void}
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