+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogChain %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\section{\class{wxLogChain}}\label{wxlogchain}
+
+This simple class allows to chain log sinks, that is to install a new sink but
+keep passing log messages to the old one instead of replacing it completely as
+\helpref{SetActiveTarget}{wxlogsetactivetarget} does.
+
+It is especially useful when you want to divert the logs somewhere (for
+example to a file or a log window) but also keep showing the error messages
+using the standard dialogs as \helpref{wxLogGui}{wxloggui} does by default.
+
+Example of usage:
+
+\begin{verbatim}
+wxLogChain *logChain = new wxLogChain(new wxLogStderr);
+
+// all the log messages are sent to stderr and also processed as usually
+...
+
+delete logChain;
+
+\end{verbatim}
+
+\wxheading{Derived from}
+
+\helpref{wxLog}{wxlog}
+
+\wxheading{Include files}
+
+<wx/log.h>
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+\membersection{wxLogChain::wxLogChain}\label{wxlogchainwxlogchain}
+
+\func{}{wxLogChain}{\param{wxLog *}{logger}}
+
+Sets the specified {\tt logger} (which may be {\tt NULL}) as the default log
+target but the log messages are also passed to the previous log target if any.
+
+\membersection{wxLogChain::\destruct{wxLogChain}}
+
+\func{}{\destruct{wxLogChain}}{\void}
+
+Destroys the previous log target.
+
+\membersection{wxLogChain::GetOldLog}\label{wxlogchaingetoldlog}
+
+\constfunc{wxLog *}{GetOldLog}{\void}
+
+Returns the pointer to the previously active log target (which may be {\tt
+NULL}).
+
+\membersection{wxLogChain::IsPassingMessages}\label{wxlogchainispassingmessages}
+
+\constfunc{bool}{IsPassingMessages}{\void}
+
+Returns {\tt TRUE} if the messages are passed to the previously active log
+target (default) or {\tt FALSE} if \helpref{PassMessages}{wxlogchainpassmessages}
+had been called.
+
+\membersection{wxLogChain::PassMessages}\label{wxlogchainpassmessages}
+
+\func{void}{PassMessages}{\param{bool }{passMessages}}
+
+By default, the log messages are passed to the previously active log target.
+Calling this function with {\tt FALSE} parameter disables this behaviour
+(presumably temporarily, as you shouldn't use wxLogChain at all otherwise) and
+it can be reenabled by calling it again with {\it passMessages} set to {\tt
+TRUE}.
+
+\membersection{wxLogChain::SetLog}\label{wxlogchainsetlog}
+
+\func{void}{SetLog}{\param{wxLog *}{logger}}
+
+Sets another log target to use (may be {\tt NULL}). The log target specified
+in the \helpref{constructor}{wxlogchainwxlogchain} or in a previous call to
+this function is deleted.
+
+This doesn't change the old log target value (the one the messages are
+forwarded to) which still remains the same as was active when wxLogChain
+object was created.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% wxLogChain %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\section{\class{wxLogPassThrough}}\label{wxlogpassthrough}
+
+A special version of \helpref{wxLogChain}{wxlogchain} which uses itself as the
+new log target. Maybe more clearly, it means that this is a log target which
+forwards the log messages to the previously installed one in addition to
+processing them itself.
+
+Unlike \helpref{wxLogChain}{wxlogchain} which is usually used directly as is,
+this class must be derived from to implement \helpref{DoLog}{wxlogdolog}
+and/or \helpref{DoLogString}{wxlogdologstring} methods.
+
+\wxheading{Derived from}
+
+\helpref{wxLogChain}{wxlogchain}
+
+\wxheading{Include files}
+
+<wx/log.h>
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+\membersection{wxLogPassThrough::wxLogPassThrough}\label{wxlogpassthroughctor}
+
+Default ctor installs this object as the current active log target.
+
projects / wxWidgets.git / blobdiff