Classes: \helpref{wxEvtHandler}{wxevthandler}, \helpref{wxWindow}{wxwindow}, \helpref{wxEvent}{wxevent}
-\subsection{Introduction}
+\subsection{Introduction}\label{eventintroduction}
Before version 2.0 of wxWidgets, events were handled by the application
either by supplying callback functions, or by overriding virtual member
instead of using the slower run-time type system.
As mentioned above, only command events are recursively applied to the parents event
-handler in the libary itself. As this quite often causes confusion for users,
+handler in the library itself. As this quite often causes confusion for users,
here is a list of system events which will NOT get sent to the parent's event handler:
\begin{twocollist}\itemsep=0pt
\twocolitem{\helpref{wxMoveEvent}{wxmoveevent}}{A move event}
\twocolitem{\helpref{wxPaintEvent}{wxpaintevent}}{A paint event}
\twocolitem{\helpref{wxQueryLayoutInfoEvent}{wxquerylayoutinfoevent}}{Used to query layout information}
+\twocolitem{\helpref{wxSetCursorEvent}{wxsetcursorevent}}{Used for special cursor processing based on current mouse position}
\twocolitem{\helpref{wxSizeEvent}{wxsizeevent}}{A size event}
\twocolitem{\helpref{wxScrollWinEvent}{wxscrollwinevent}}{A scroll event sent by a scrolled window (not a scroll bar)}
\twocolitem{\helpref{wxSysColourChangedEvent}{wxsyscolourchangedevent}}{A system colour change event}
-\twocolitem{\helpref{wxUpdateUIEvent}{wxupdateuievent}}{A user interface update event}
\end{twocollist}
In some cases, it might be desired by the programmer to get a certain number
will have to be written that will override ProcessEvent() in order to pass
all events (or any selection of them) to the parent window.
+
+\subsection{Events generated by the user vs programmatically generated events}\label{progevent}
+
+While generically \helpref{wxEvents}{wxevent} can be generated both by user
+actions (e.g. resize of a \helpref{wxWindow}{wxwindow}) and by calls to functions
+(e.g. \helpref{wxWindow::SetSize}{wxwindowsetsize}), wxWidgets controls
+normally send \helpref{wxCommandEvent}{wxcommandevent}-derived events only for
+the user-generated events. The only {\bf exceptions} to this rule are:
+
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\helpref{wxNotebook::AddPage}{wxnotebookaddpage}}{No event-free alternatives}
+\twocolitem{\helpref{wxNotebook::AdvanceSelection}{wxnotebookadvanceselection}}{No event-free alternatives}
+\twocolitem{\helpref{wxNotebook::DeletePage}{wxnotebookdeletepage}}{No event-free alternatives}
+\twocolitem{\helpref{wxNotebook::SetSelection}{wxnotebooksetselection}}{Use \helpref{wxNotebook::ChangeSelection}{wxnotebookchangeselection} instead, as \helpref{wxNotebook::SetSelection}{wxnotebooksetselection} is deprecated}
+\twocolitem{\helpref{wxTreeCtrl::Delete}{wxtreectrldelete}}{No event-free alternatives}
+\twocolitem{\helpref{wxTreeCtrl::DeleteAllItems}{wxtreectrldeleteallitems}}{No event-free alternatives}
+\twocolitem{\helpref{wxTreeCtrl::EditLabel}{wxtreectrleditlabel}}{No event-free alternatives}
+\twocolitem{All \helpref{wxTextCtrl}{wxtextctrl} methods}{\helpref{wxTextCtrl::ChangeValue}{wxtextctrlchangevalue} can be used instead
+of \helpref{wxTextCtrl::SetValue}{wxtextctrlsetvalue} but the other functions,
+such as \helpref{Replace}{wxtextctrlreplace} or \helpref{WriteText}{wxtextctrlwritetext}
+don't have event-free equivalents}
+\end{twocollist}
+
+
% VZ: it doesn't work like this, but just in case we ever reenable this
% behaviour, I leave it here
%
% requests, so no extra coding is required to support them in your menus and
% toolbars.
-\subsection{Pluggable event handlers}
+\subsection{Pluggable event handlers}\label{pluggablehandlers}
In fact, you don't have to derive a new class from a window class
if you don't want to. You can derive a new class from wxEvtHandler instead,
\subsection{Event macros summary}\label{eventmacros}
-\wxheading{Generic event table macros}
-
-\twocolwidtha{8cm}%
-\begin{twocollist}\itemsep=0pt
-\twocolitem{\windowstyle{EVT\_CUSTOM(event, id, func)}}{Allows you to add a custom event table
-entry by specifying the event identifier (such as wxEVT\_SIZE), the window identifier,
-and a member function to call.}
-\twocolitem{\windowstyle{EVT\_CUSTOM\_RANGE(event, id1, id2, func)}}{The same as EVT\_CUSTOM,
-but responds to a range of window identifiers.}
-\twocolitem{\windowstyle{EVT\_COMMAND(id, event, func)}}{The same as EVT\_CUSTOM, but
-expects a member function with a wxCommandEvent argument.}
-\twocolitem{\windowstyle{EVT\_COMMAND\_RANGE(id1, id2, event, func)}}{The same as EVT\_CUSTOM\_RANGE, but
-expects a member function with a wxCommandEvent argument.}
-\end{twocollist}
-
\wxheading{Macros listed by event class}
The documentation for specific event macros is organised by event class. Please refer
\twocolitem{\helpref{wxPaintEvent}{wxpaintevent}}{The EVT\_PAINT macro is used to handle window paint requests.}
\twocolitem{\helpref{wxScrollEvent}{wxscrollevent}}{These macros are used to handle scroll events from
\helpref{wxScrollBar}{wxscrollbar}, \helpref{wxSlider}{wxslider},and \helpref{wxSpinButton}{wxspinbutton}.}
+\twocolitem{\helpref{wxSetCursorEvent}{wxsetcursorevent}}{The EVT\_SET\_CURSOR macro is used for special cursor processing.}
\twocolitem{\helpref{wxSizeEvent}{wxsizeevent}}{The EVT\_SIZE macro is used to handle a window resize.}
\twocolitem{\helpref{wxSplitterEvent}{wxsplitterevent}}{The EVT\_SPLITTER\_SASH\_POS\_CHANGED, EVT\_SPLITTER\_UNSPLIT
and EVT\_SPLITTER\_DCLICK macros are used to handle the various splitter window events.}
toolbars and controls.}
\end{twocollist}
+\subsection{Custom event summary}\label{customevents}
+
+\wxheading{General approach}
+
+Since version 2.2.x of wxWidgets, each event type is identified by ID which
+is given to the event type {\it at runtime} which makes it possible to add
+new event types to the library or application without risking ID clashes
+(two different event types mistakingly getting the same event ID). This
+event type ID is stored in a struct of type {\bf const wxEventType}.
+
+In order to define a new event type, there are principally two choices.
+One is to define a entirely new event class (typically deriving from
+\helpref{wxEvent}{wxevent} or \helpref{wxCommandEvent}{wxcommandevent}.
+The other is to use the existing event classes and give them an new event
+type. You'll have to define and declare a new event type using either way,
+and this is done using the following macros:
+
+\begin{verbatim}
+// in the header of the source file
+BEGIN_DECLARE_EVENT_TYPES()
+DECLARE_EVENT_TYPE(name, value)
+END_DECLARE_EVENT_TYPES()
+
+// in the implementation
+DEFINE_EVENT_TYPE(name)
+\end{verbatim}
+
+You can ignore the {\it value} parameter of the DECLARE\_EVENT\_TYPE macro
+since it used only for backwards compatibility with wxWidgets 2.0.x based
+applications where you have to give the event type ID an explicit value.
+
+See also the \helpref{event sample}{sampleevent} for an example of code
+defining and working with the custom event types.
+
+\wxheading{Using existing event classes}
+
+If you just want to use a \helpref{wxCommandEvent}{wxcommandevent} with
+a new event type, you can then use one of the generic event table macros
+listed below, without having to define a new macro yourself. This also
+has the advantage that you won't have to define a new \helpref{wxEvent::Clone()}{wxeventclone}
+method for posting events between threads etc. This could look like this
+in your code:
+
+{\small%
+\begin{verbatim}
+DECLARE_EVENT_TYPE(wxEVT_MY_EVENT, -1)
+
+DEFINE_EVENT_TYPE(wxEVT_MY_EVENT)
+
+// user code intercepting the event
+
+BEGIN_EVENT_TABLE(MyFrame, wxFrame)
+ EVT_MENU (wxID_EXIT, MyFrame::OnExit)
+ // ....
+ EVT_COMMAND (ID_MY_WINDOW, wxEVT_MY_EVENT, MyFrame::OnMyEvent)
+END_EVENT_TABLE()
+
+void MyFrame::OnMyEvent( wxCommandEvent &event )
+{
+ // do something
+ wxString text = event.GetText();
+}
+
+
+// user code sending the event
+
+void MyWindow::SendEvent()
+{
+ wxCommandEvent event( wxEVT_MY_EVENT, GetId() );
+ event.SetEventObject( this );
+ // Give it some contents
+ event.SetText( wxT("Hallo") );
+ // Send it
+ GetEventHandler()->ProcessEvent( event );
+}
+\end{verbatim}
+}%
+
+
+\wxheading{Generic event table macros}
+
+\twocolwidtha{8cm}%
+\begin{twocollist}\itemsep=0pt
+\twocolitem{\windowstyle{EVT\_CUSTOM(event, id, func)}}{Allows you to add a custom event table
+entry by specifying the event identifier (such as wxEVT\_SIZE), the window identifier,
+and a member function to call.}
+\twocolitem{\windowstyle{EVT\_CUSTOM\_RANGE(event, id1, id2, func)}}{The same as EVT\_CUSTOM,
+but responds to a range of window identifiers.}
+\twocolitem{\windowstyle{EVT\_COMMAND(id, event, func)}}{The same as EVT\_CUSTOM, but
+expects a member function with a wxCommandEvent argument.}
+\twocolitem{\windowstyle{EVT\_COMMAND\_RANGE(id1, id2, event, func)}}{The same as EVT\_CUSTOM\_RANGE, but
+expects a member function with a wxCommandEvent argument.}
+\twocolitem{\windowstyle{EVT\_NOTIFY(event, id, func)}}{The same as EVT\_CUSTOM, but
+expects a member function with a wxNotifyEvent argument.}
+\twocolitem{\windowstyle{EVT\_NOTIFY\_RANGE(event, id1, id2, func)}}{The same as EVT\_CUSTOM\_RANGE, but
+expects a member function with a wxNotifyEvent argument.}
+\end{twocollist}
+
+
+\wxheading{Defining your own event class}
+
+Under certain circumstances, it will be required to define your own event
+class e.g. for sending more complex data from one place to another. Apart
+from defining your event class, you will also need to define your own
+event table macro (which is quite long). Watch out to put in enough
+casts to the inherited event function. Here is an example, taken mostly
+from the {\it wxPlot} library, which is in the {\it contrib} section of
+the wxWidgets sources.
+
+{\small%
+\begin{verbatim}
+
+// code defining event
+
+class wxPlotEvent: public wxNotifyEvent
+{
+public:
+ wxPlotEvent( wxEventType commandType = wxEVT_NULL, int id = 0 );
+
+ // accessors
+ wxPlotCurve *GetCurve()
+ { return m_curve; }
+
+ // required for sending with wxPostEvent()
+ wxEvent* Clone();
+
+private:
+ wxPlotCurve *m_curve;
+};
+
+DECLARE_EVENT_MACRO( wxEVT_PLOT_ACTION, -1 )
+
+typedef void (wxEvtHandler::*wxPlotEventFunction)(wxPlotEvent&);
+
+#define EVT_PLOT(id, fn) \
+ DECLARE_EVENT_TABLE_ENTRY( wxEVT_PLOT_ACTION, id, -1, \
+ (wxObjectEventFunction) (wxEventFunction) (wxCommandEventFunction) (wxNotifyEventFunction) \
+ wxStaticCastEvent( wxPlotEventFunction, & fn ), (wxObject *) NULL ),
+
+
+// code implementing the event type and the event class
+
+DEFINE_EVENT_TYPE( wxEVT_PLOT_ACTION )
+
+wxPlotEvent::wxPlotEvent( ...
+
+
+// user code intercepting the event
+
+BEGIN_EVENT_TABLE(MyFrame, wxFrame)
+ EVT_PLOT (ID_MY_WINDOW, MyFrame::OnPlot)
+END_EVENT_TABLE()
+
+void MyFrame::OnPlot( wxPlotEvent &event )
+{
+ wxPlotCurve *curve = event.GetCurve();
+}
+
+
+// user code sending the event
+
+void MyWindow::SendEvent()
+{
+ wxPlotEvent event( wxEVT_PLOT_ACTION, GetId() );
+ event.SetEventObject( this );
+ event.SetCurve( m_curve );
+ GetEventHandler()->ProcessEvent( event );
+}
+
+\end{verbatim}
+}%
+
projects / wxWidgets.git / blobdiff