\section{\class{wxMouseEvent}}\label{wxmouseevent}
-This event class contains information about mouse events, particularly
-events received by canvases. 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.
+
+All mouse events involving the buttons use {\tt wxMOUSE\_BTN\_LEFT} for the
+left mouse button, {\tt wxMOUSE\_BTN\_MIDDLE} for the middle one and
+{\tt wxMOUSE\_BTN\_RIGHT} 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 wxWidgets 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 former 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
+wxWidgets 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}
+\wxheading{Include files}
+
+<wx/event.h>
+
\wxheading{Event table macros}
To process a mouse event, use these event handler macros to direct input to member
\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
-\twocolitem{{\bf EVT\_LEFT\_DOWN(func)}}{Process a wxEVT\_LEFT\_DOWN event.}
+\twocolitem{{\bf EVT\_LEFT\_DOWN(func)}}{Process a wxEVT\_LEFT\_DOWN event. The
+handler of this event should normally call \helpref{event.Skip()}{wxeventskip} to
+allow the default processing to take place as otherwise the window under mouse
+wouldn't get the focus.}
\twocolitem{{\bf EVT\_LEFT\_UP(func)}}{Process a wxEVT\_LEFT\_UP event.}
\twocolitem{{\bf EVT\_LEFT\_DCLICK(func)}}{Process a wxEVT\_LEFT\_DCLICK event.}
\twocolitem{{\bf EVT\_MIDDLE\_DOWN(func)}}{Process a wxEVT\_MIDDLE\_DOWN event.}
\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}%
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxMouseEvent::m\_altDown}
+
+\membersection{wxMouseEvent::m\_altDown}\label{wxmouseeventmaltdown}
\member{bool}{m\_altDown}
-TRUE if the Alt key is pressed down.
+true if the Alt key is pressed down.
-\membersection{wxMouseEvent::m\_controlDown}
+
+\membersection{wxMouseEvent::m\_controlDown}\label{wxmouseeventmcontroldown}
\member{bool}{m\_controlDown}
-TRUE if control key is pressed down.
+true if control key is pressed down.
+
-\membersection{wxMouseEvent::m\_leftDown}
+\membersection{wxMouseEvent::m\_leftDown}\label{wxmouseeventmleftdown}
\member{bool}{m\_leftDown}
-TRUE if the left mouse button is currently pressed down.
+true if the left mouse button is currently pressed down.
-\membersection{wxMouseEvent::m\_middleDown}
-\member{bool}{m\_middleDown}
+\membersection{wxMouseEvent::m\_middleDown}\label{wxmouseeventmmiddledown}
-TRUE if the middle mouse button is currently pressed down.
+\member{bool}{m\_middleDown}
-\membersection{wxMouseEvent::m\_rightDown}
+true if the middle mouse button is currently pressed down.
-\member{bool}{m\_rightDown}
-TRUE if the right mouse button is currently pressed down.
+\membersection{wxMouseEvent::m\_rightDown}\label{wxmouseeventmrightdown}
-\membersection{wxMouseEvent::m\_leftDown}
+\member{bool}{m\_rightDown}
-\member{bool}{m\_leftDown}
+true if the right mouse button is currently pressed down.
-TRUE if the left mouse button is currently pressed down.
-\membersection{wxMouseEvent::m\_metaDown}
+\membersection{wxMouseEvent::m\_metaDown}\label{wxmouseeventmmetadown}
\member{bool}{m\_metaDown}
-TRUE if the Meta key is pressed down.
+true if the Meta key is pressed down.
+
-\membersection{wxMouseEvent::m\_shiftDown}
+\membersection{wxMouseEvent::m\_shiftDown}\label{wxmouseeventmshiftdown}
\member{bool}{m\_shiftDown}
-TRUE if shift is pressed down.
+true if shift is pressed down.
+
-\membersection{wxMouseEvent::m\_x}
+\membersection{wxMouseEvent::m\_x}\label{wxmouseeventmx}
-\member{float}{m\_x}
+\member{long}{m\_x}
X-coordinate of the event.
-\membersection{wxMouseEvent::m\_y}
-\member{float}{m\_y}
+\membersection{wxMouseEvent::m\_y}\label{wxmouseeventmy}
+
+\member{long}{m\_y}
Y-coordinate of the event.
-\membersection{wxMouseEvent::wxMouseEvent}
+
+\membersection{wxMouseEvent::m\_wheelRotation}\label{wxmouseeventmwheelrotation}
+
+\member{int}{m\_wheelRotation}
+
+The distance the mouse wheel is rotated.
+
+
+\membersection{wxMouseEvent::m\_wheelDelta}\label{wxmouseeventmwheeldelta}
+
+\member{int}{m\_wheelDelta}
+
+The wheel delta, normally $120$.
+
+
+\membersection{wxMouseEvent::m\_linesPerAction}\label{wxmouseeventmlinesperaction}
+
+\member{int}{m\_linesPerAction}
+
+The configured number of lines (or whatever) to be scrolled per wheel
+action.
+
+
+
+\membersection{wxMouseEvent::wxMouseEvent}\label{wxmouseeventctor}
\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}
+
+\membersection{wxMouseEvent::AltDown}\label{wxmouseeventaltdown}
\func{bool}{AltDown}{\void}
-Returns TRUE if the Alt key was down at the time of the event.
+Returns true if the Alt key was down at the time of the event.
+
-\membersection{wxMouseEvent::Button}
+\membersection{wxMouseEvent::Button}\label{wxmouseeventbutton}
\func{bool}{Button}{\param{int}{ button}}
-Returns TRUE if the identified mouse button is changing state. Valid
-values of {\it button} are 1, 2 or 3 for left, middle and right
-buttons respectively.
+Returns true if the identified mouse button is changing state. Valid
+values of {\it button} are:
+
+\begin{twocollist}\itemsep=0pt
+\twocolitem{{\tt wxMOUSE\_BTN\_LEFT}}{check if left button was pressed}
+\twocolitem{{\tt wxMOUSE\_BTN\_MIDDLE}}{check if middle button was pressed}
+\twocolitem{{\tt wxMOUSE\_BTN\_RIGHT}}{check if right button was pressed}
+\twocolitem{{\tt wxMOUSE\_BTN\_ANY}}{check if any button was pressed}
+\end{twocollist}
-Not all mice have middle buttons so a portable application should avoid
-this one.
-\membersection{wxMouseEvent::ButtonDClick}\label{buttondclick}
+\membersection{wxMouseEvent::ButtonDClick}\label{wxmouseeventbuttondclick}
-\func{bool}{ButtonDClick}{\param{int}{ but = -1}}
+\func{bool}{ButtonDClick}{\param{int}{ but = wxMOUSE\_BTN\_ANY}}
-If the argument is omitted, this returns TRUE if the event was a mouse
+If the argument is omitted, this returns true if the event was a mouse
double click event. Otherwise the argument specifies which double click event
-was generated (1, 2 or 3 for left, middle and right buttons respectively).
+was generated (see \helpref{Button}{wxmouseeventbutton} for the possible
+values).
+
-\membersection{wxMouseEvent::ButtonDown}
+\membersection{wxMouseEvent::ButtonDown}\label{wxmouseeventbuttondown}
\func{bool}{ButtonDown}{\param{int}{ but = -1}}
-If the argument is omitted, this returns TRUE if the event was a mouse
+If the argument is omitted, this returns true if the event was a mouse
button down event. Otherwise the argument specifies which button-down event
-was generated (1, 2 or 3 for left, middle and right buttons respectively).
+was generated (see \helpref{Button}{wxmouseeventbutton} for the possible
+values).
+
-\membersection{wxMouseEvent::ButtonUp}
+
+\membersection{wxMouseEvent::ButtonUp}\label{wxmouseeventbuttonup}
\func{bool}{ButtonUp}{\param{int}{ but = -1}}
-If the argument is omitted, this returns TRUE if the event was a mouse
+If the argument is omitted, this returns true if the event was a mouse
button up event. Otherwise the argument specifies which button-up event
-was generated (1, 2 or 3 for left, middle and right buttons respectively).
+was generated (see \helpref{Button}{wxmouseeventbutton} for the possible
+values).
+
+
-\membersection{wxMouseEvent::ControlDown}
+\membersection{wxMouseEvent::CmdDown}\label{wxmouseeventcmddown}
+
+\constfunc{bool}{CmdDown}{\void}
+
+Same as \helpref{MetaDown}{wxmouseeventmetadown} under Mac, same as
+\helpref{ControlDown}{wxmouseeventcontroldown} elsewhere.
+
+\wxheading{See also}
+
+\helpref{wxKeyEvent::CmdDown}{wxkeyeventcmddown}
+
+
+\membersection{wxMouseEvent::ControlDown}\label{wxmouseeventcontroldown}
\func{bool}{ControlDown}{\void}
-Returns TRUE if the control key was down at the time of the event.
+Returns true if the control key was down at the time of the event.
-\membersection{wxMouseEvent::Dragging}
+
+\membersection{wxMouseEvent::Dragging}\label{wxmouseeventdragging}
\func{bool}{Dragging}{\void}
-Returns TRUE if this was a dragging event (motion while a button is depressed).
+Returns true if this was a dragging event (motion while a button is depressed).
+
+\wxheading{See also}
+
+\helpref{Moving}{wxmouseeventmoving}
+
\membersection{wxMouseEvent::Entering}\label{wxmouseevententering}
\func{bool}{Entering}{\void}
-Returns TRUE if the mouse was entering the canvas (MS Windows and Motif).
+Returns true if the mouse was entering the window.
See also \helpref{wxMouseEvent::Leaving}{wxmouseeventleaving}.
+
+\membersection{wxMouseEvent::GetButton}\label{wxmouseeventgetbutton}
+
+\constfunc{int}{GetButton}{\void}
+
+Returns the mouse button which generated this event or {\tt wxMOUSE\_BTN\_NONE}
+if no button is involved (for mouse move, enter or leave event, for example).
+Otherwise {\tt wxMOUSE\_BTN\_LEFT} is returned for the left button down, up and
+double click events, {\tt wxMOUSE\_BTN\_MIDDLE} and {\tt wxMOUSE\_BTN\_RIGHT}
+for the same events for the middle and the right buttons respectively.
+
+
+\membersection{wxMouseEvent::GetPosition}\label{wxmouseeventgetposition}
+
+\constfunc{wxPoint}{GetPosition}{\void}
+
+\constfunc{void}{GetPosition}{\param{wxCoord*}{ x}, \param{wxCoord*}{ y}}
+
+\constfunc{void}{GetPosition}{\param{long*}{ x}, \param{long*}{ y}}
+
+Sets *x and *y to the position at which the event occurred.
+
+Returns the physical mouse position in pixels.
+
+Note that if the mouse event has been artificially generated from a special
+keyboard combination (e.g. under Windows when the ``menu'' key is pressed), the
+returned position is \texttt{wxDefaultPosition}.
+
+
+\membersection{wxMouseEvent::GetLogicalPosition}\label{wxmouseeventgetlogicalposition}
+
+\constfunc{wxPoint}{GetLogicalPosition}{\param{const wxDC\&}{ dc}}
+
+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}
-\func{float}{GetX}{\void}
+\constfunc{long}{GetX}{\void}
+
+Returns X coordinate of the physical mouse event position.
-Returns X coordinate of the mouse event position.
\membersection{wxMouseEvent::GetY}\label{wxmouseeventgety}
-\func{float}{GetY}{\void}
+\func{long}{GetY}{\void}
+
+Returns Y coordinate of the physical mouse event position.
-Returns Y coordinate of the mouse event position.
-\membersection{wxMouseEvent::IsButton}
+\membersection{wxMouseEvent::IsButton}\label{wxmouseeventisbutton}
-\func{bool}{IsButton}{\void}
+\constfunc{bool}{IsButton}{\void}
-Returns TRUE if the event was a mouse button event (not necessarily a button down event -
+Returns true if the event was a mouse button event (not necessarily a button down event -
that may be tested using {\it ButtonDown}).
+
+\membersection{wxMouseEvent::IsPageScroll}\label{wxmouseeventispagescroll}
+
+\constfunc{bool}{IsPageScroll}{\void}
+
+Returns true if the system has been setup to do page scrolling with
+the mouse wheel instead of line scrolling.
+
+
\membersection{wxMouseEvent::Leaving}\label{wxmouseeventleaving}
-\func{bool}{Leaving}{\void}
+\constfunc{bool}{Leaving}{\void}
-Returns TRUE if the mouse was leaving the canvas (MS Windows and Motif).
+Returns true if the mouse was leaving the window.
See also \helpref{wxMouseEvent::Entering}{wxmouseevententering}.
-\membersection{wxMouseEvent::LeftDClick}
-\func{bool}{LeftDClick}{\void}
+\membersection{wxMouseEvent::LeftDClick}\label{wxmouseeventleftdclick}
+
+\constfunc{bool}{LeftDClick}{\void}
-Returns TRUE if the event was a left double click.
+Returns true if the event was a left double click.
-\membersection{wxMouseEvent::LeftDown}
-\func{bool}{LeftDown}{\void}
+\membersection{wxMouseEvent::LeftDown}\label{wxmouseeventleftdown}
-Returns TRUE if the left mouse button changed to down.
+\constfunc{bool}{LeftDown}{\void}
-\membersection{wxMouseEvent::LeftIsDown}
+Returns true if the left mouse button changed to down.
-\func{bool}{LeftIsDown}{\void}
-Returns TRUE if the left mouse button is currently down, independent
+\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.
-\membersection{wxMouseEvent::LeftUp}
+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.
-\func{bool}{LeftUp}{\void}
+This event is usually used in the mouse event handlers which process "move
+mouse" messages to determine whether the user is (still) dragging the mouse.
-Returns TRUE if the left mouse button changed to up.
-\membersection{wxMouseEvent::MetaDown}
+\membersection{wxMouseEvent::LeftUp}\label{wxmouseeventleftup}
-\func{bool}{MetaDown}{\void}
+\constfunc{bool}{LeftUp}{\void}
-Returns TRUE if the Meta key was down at the time of the event.
+Returns true if the left mouse button changed to up.
-\membersection{wxMouseEvent::MiddleDClick}
-\func{bool}{MiddleDClick}{\void}
+\membersection{wxMouseEvent::MetaDown}\label{wxmouseeventmetadown}
-Returns TRUE if the event was a middle double click.
+\constfunc{bool}{MetaDown}{\void}
-\membersection{wxMouseEvent::MiddleDown}
+Returns true if the Meta key was down at the time of the event.
-\func{bool}{MiddleDown}{\void}
-Returns TRUE if the middle mouse button changed to down.
+\membersection{wxMouseEvent::MiddleDClick}\label{wxmouseeventmiddledclick}
-\membersection{wxMouseEvent::MiddleIsDown}
+\constfunc{bool}{MiddleDClick}{\void}
-\func{bool}{MiddleIsDown}{\void}
+Returns true if the event was a middle double click.
-Returns TRUE if the middle mouse button is currently down, independent
-of the current event type.
-\membersection{wxMouseEvent::MiddleUp}
+\membersection{wxMouseEvent::MiddleDown}\label{wxmouseeventmiddledown}
-\func{bool}{MiddleUp}{\void}
+\constfunc{bool}{MiddleDown}{\void}
-Returns TRUE if the middle mouse button changed to up.
+Returns true if the middle mouse button changed to down.
-\membersection{wxMouseEvent::Moving}
-\func{bool}{Moving}{\void}
+\membersection{wxMouseEvent::MiddleIsDown}\label{wxmouseeventmiddleisdown}
+
+\constfunc{bool}{MiddleIsDown}{\void}
+
+Returns true if the middle mouse button is currently down, independent
+of the current event type.
-Returns TRUE if this was a motion event (no buttons depressed).
-\membersection{wxMouseEvent::Position}
+\membersection{wxMouseEvent::MiddleUp}\label{wxmouseeventmiddleup}
-\func{void}{Position}{\param{float *}{x}, \param{float *}{y}}
+\constfunc{bool}{MiddleUp}{\void}
-Sets *x and *y to the position at which the event occurred. If the
-window is a canvas, the position is converted to logical units
-(according to the current mapping mode) with scrolling taken into
-account. To get back to device units (for example to calculate where on the
-screen to place a dialog box associated with a canvas mouse event), use
-\rtfsp{\bf wxDC::LogicalToDeviceX} and {\bf wxDC::LogicalToDeviceY}.
+Returns true if the middle mouse button changed to up.
-For example, the following code calculates screen pixel coordinates
-from the frame position, canvas view start (assuming the canvas is the only
-subwindow on the frame and therefore at the top left of it), and the
-logical event position. A menu is popped up at the position where the
-mouse click occurred. (Note that the application should also check that
-the dialog box will be visible on the screen, since the click could have
-occurred near the screen edge!)
-\begin{verbatim}
- float event_x, event_y;
- event.Position(&event_x, &event_y);
- frame->GetPosition(&x, &y);
- canvas->ViewStart(&x1, &y1);
- int mouse_x = (int)(canvas->GetDC()->LogicalToDeviceX(event_x + x - x1);
- int mouse_y = (int)(canvas->GetDC()->LogicalToDeviceY(event_y + y - y1);
+\membersection{wxMouseEvent::Moving}\label{wxmouseeventmoving}
- char *choice = wxGetSingleChoice("Menu", "Pick a node action",
- no_choices, choices, frame, mouse_x, mouse_y);
-\end{verbatim}
+\constfunc{bool}{Moving}{\void}
-\membersection{wxMouseEvent::RightDClick}
+Returns true if this was a motion event and no mouse buttons were pressed.
+If any mouse button is held pressed, then this method returns \false and
+\helpref{Dragging}{wxmouseeventdragging} returns \true.
-\func{bool}{RightDClick}{\void}
-Returns TRUE if the event was a right double click.
+\membersection{wxMouseEvent::RightDClick}\label{wxmouseeventrightdclick}
-\membersection{wxMouseEvent::RightDown}
+\constfunc{bool}{RightDClick}{\void}
-\func{bool}{RightDown}{\void}
+Returns true if the event was a right double click.
-Returns TRUE if the right mouse button changed to down.
-\membersection{wxMouseEvent::RightIsDown}
+\membersection{wxMouseEvent::RightDown}\label{wxmouseeventrightdown}
-\func{bool}{RightIsDown}{\void}
+\constfunc{bool}{RightDown}{\void}
-Returns TRUE if the right mouse button is currently down, independent
+Returns true if the right mouse button changed to down.
+
+
+\membersection{wxMouseEvent::RightIsDown}\label{wxmouseeventrightisdown}
+
+\constfunc{bool}{RightIsDown}{\void}
+
+Returns true if the right mouse button is currently down, independent
of the current event type.
-\membersection{wxMouseEvent::RightUp}
-\func{bool}{RightUp}{\void}
+\membersection{wxMouseEvent::RightUp}\label{wxmouseeventrightup}
+
+\constfunc{bool}{RightUp}{\void}
-Returns TRUE if the right mouse button changed to up.
+Returns true if the right mouse button changed to up.
-\membersection{wxMouseEvent::ShiftDown}
+\membersection{wxMouseEvent::ShiftDown}\label{wxmouseeventshiftdown}
-\func{bool}{ShiftDown}{\void}
+\constfunc{bool}{ShiftDown}{\void}
-Returns TRUE if the shift key was down at the time of the event.
+Returns true if the shift key was down at the time of the event.
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