\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
%
\rtfsp\helpref{wxWindow::SetEventHandler}{wxwindowseteventhandler} (or, preferably,
\rtfsp\helpref{wxWindow::PushEventHandler}{wxwindowpusheventhandler}) to make this
event handler the object that responds to events. This way, you can avoid
-a lot of class derivation, and use the same event handler object to
-handle events from instances of different classes. If you ever have to call a window's event handler
+a lot of class derivation, and use instances of the same event handler class (but different
+objects as the same event handler object shouldn't be used more than once) to
+handle events from instances of different widget classes. If you ever have to call a window's event handler
manually, use the GetEventHandler function to retrieve the window's event handler and use that
to call the member function. By default, GetEventHandler returns a pointer to the window itself
unless an application has redirected event handling using SetEventHandler or PushEventHandler.
\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
+since it is 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
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(id, event, func)}}{The same as EVT\_CUSTOM, but
+\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(id1, id2, event, func)}}{The same as EVT\_CUSTOM\_RANGE, but
+\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}
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.
+casts to the inherited event function. Here is an example:
{\small%
\begin{verbatim}
{ return m_curve; }
// required for sending with wxPostEvent()
- wxEvent* Clone();
+ virtual wxEvent *Clone() const;
private:
wxPlotCurve *m_curve;
};
-DECLARE_EVENT_MACRO( wxEVT_PLOT_ACTION, -1 )
+DECLARE_EVENT_TYPE( wxEVT_PLOT_ACTION, -1 )
typedef void (wxEvtHandler::*wxPlotEventFunction)(wxPlotEvent&);
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