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refactor wxLog documentation moving verbose parts to the wxLog overview and grouping similar wxLog functions together

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65103 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2010-07-25 11:53:54 +00:00
parent 128eed6c64
commit 54e280d860
2 changed files with 315 additions and 333 deletions
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470
interface/wx/log.h
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@@ -1,6 +1,6 @@
/////////////////////////////////////////////////////////////////////////////
// Name: log.h
// Purpose: interface of wxLogWindow
// Purpose: interface of wxLog* classes
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows licence
@@ -96,9 +96,11 @@ public:
@true to show the frame initially (default), otherwise
Show() must be called later.
@param passToOld
@true to process the log messages normally in addition to
logging them in the log frame (default), @false to only log them in the
log frame.
@true to process the log messages normally in addition to logging them
in the log frame (default), @false to only log them in the log frame.
Note that if no targets were set using wxLog::SetActiveTarget() then
wxLogWindow simply becomes the active one and messages won't be passed
to other targets.
*/
wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true,
bool passToOld = true);
@@ -584,145 +586,32 @@ public:
/**
@class wxLog
wxLog class defines the interface for the @e log targets used by wxWidgets
wxLog class defines the interface for the <em>log targets</em> used by wxWidgets
logging functions as explained in the @ref overview_log.
The only situations when you need to directly use this class is when you want
to derive your own log target because the existing ones don't satisfy your
needs. Another case is if you wish to customize the behaviour of the standard
logging classes (all of which respect the wxLog settings): for example, set
which trace messages are logged and which are not or change (or even remove
completely) the timestamp on the messages.
needs.
Otherwise, it is completely hidden behind the @e wxLogXXX() functions and
you may not even know about its existence.
Otherwise, it is completely hidden behind the @ref group_funcmacro_log "wxLogXXX() functions"
and you may not even know about its existence.
@note For console-mode applications, the default target is wxLogStderr, so
that all @e wxLogXXX() functions print on @c stderr when @c wxUSE_GUI = 0.
@section log_derivingyours Deriving your own log target
There are several methods which may be overridden in the derived class to
customize log messages handling: DoLogRecord(), DoLogTextAtLevel() and
DoLogText().
The last method is the simplest one: you should override it if you simply
want to redirect the log output elsewhere, without taking into account the
level of the message. If you do want to handle messages of different levels
differently, then you should override DoLogTextAtLevel().
Finally, if more control over the output format is needed, then the first
function must be overridden as it allows to construct custom messages
depending on the log level or even do completely different things depending
on the message severity (for example, throw away all messages except
warnings and errors, show warnings on the screen and forward the error
messages to the user's (or programmer's) cell phone -- maybe depending on
whether the timestamp tells us if it is day or night in the current time
zone).
There also functions to support message buffering. Why are they needed?
Some of wxLog implementations, most notably the standard wxLogGui class,
buffer the messages (for example, to avoid showing the user a zillion of modal
message boxes one after another -- which would be really annoying).
Flush() shows them all and clears the buffer contents.
This function doesn't do anything if the buffer is already empty.
@see FlushActive()
@section log_tracemasks Using trace masks
Notice that the use of log trace masks is hardly necessary any longer in
current wxWidgets version as the same effect can be achieved by using
different log components for different log statements of any level. Please
see @ref overview_log_enable for more information about the log components.
The functions below allow some limited customization of wxLog behaviour
without writing a new log target class (which, aside from being a matter of
several minutes, allows you to do anything you want).
The verbose messages are the trace messages which are not disabled in the
release mode and are generated by wxLogVerbose().
They are not normally shown to the user because they present little interest,
but may be activated, for example, in order to help the user find some program
problem.
As for the (real) trace messages, their handling depends on the currently
enabled trace masks: if AddTraceMask() was called for the mask of the given
message, it will be logged, otherwise nothing happens.
For example,
@code
wxLogTrace( wxTRACE_OleCalls, "IFoo::Bar() called" );
@endcode
will log the message if it was preceded by:
@code
wxLog::AddTraceMask( wxTRACE_OleCalls);
@endcode
The standard trace masks are given in wxLogTrace() documentation.
Finally, the @e wxLog::DoLog() function automatically prepends a time stamp
to all the messages. The format of the time stamp may be changed: it can be
any string with % specifications fully described in the documentation of the
standard @e strftime() function. For example, the default format is
"[%d/%b/%y %H:%M:%S] " which gives something like "[17/Sep/98 22:10:16] "
(without quotes) for the current date. Setting an empty string as the time
format or calling the shortcut wxLog::DisableTimestamp(), disables timestamping
of the messages completely.
See also
@li AddTraceMask()
@li RemoveTraceMask()
@li ClearTraceMasks()
@li GetTraceMasks()
@li IsAllowedTraceMask()
@li SetVerbose()
@li GetVerbose()
@li SetTimestamp()
@li GetTimestamp()
@li SetTraceMask()
@li GetTraceMask()
@li SetRepetitionCounting()
@li GetRepetitionCounting()
@note
Timestamping is disabled for Visual C++ users in debug builds by
default because otherwise it would be impossible to directly go to the line
from which the log message was generated by simply clicking in the debugger
window on the corresponding error message. If you wish to enable it, please
use SetTimestamp() explicitly.
@section log_target Manipulating the log target
The functions in this section work with and manipulate the active log
target.
Get/Set methods are used to install/query the current active target and,
finally, DontCreateOnDemand() disables the automatic creation of a standard
log target if none actually exists. It is only useful when the application
is terminating and shouldn't be used in other situations because it may
easily lead to a loss of messages.
See also:
@li GetActiveTarget()
@li SetActiveTarget()
@li DontCreateOnDemand()
@li Suspend()
@li Resume()
@library{wxcore}
@category{logging}
@see @ref overview_log
@see @ref overview_log, @ref group_funcmacro_log "wxLogXXX() functions"
*/
class wxLog
{
public:
/**
@name Trace mask functions
*/
//@{
/**
Add the @a mask to the list of allowed masks for wxLogTrace().
@@ -737,50 +626,49 @@ public:
*/
static void ClearTraceMasks();
/**
Returns the currently allowed list of string trace masks.
@see AddTraceMask().
*/
static const wxArrayString& GetTraceMasks();
/**
Returns @true if the @a mask is one of allowed masks for wxLogTrace().
See also: AddTraceMask(), RemoveTraceMask()
*/
static bool IsAllowedTraceMask(const wxString& mask);
/**
Remove the @a mask from the list of allowed masks for
wxLogTrace().
@see AddTraceMask()
*/
static void RemoveTraceMask(const wxString& mask);
//@}
/**
@name Log target functions
*/
//@{
/**
Instructs wxLog to not create new log targets on the fly if there is none
currently. (Almost) for internal use only: it is supposed to be called by the
application shutdown code.
currently (see GetActiveTarget()).
(Almost) for internal use only: it is supposed to be called by the
application shutdown code (where you don't want the log target to be
automatically created anymore).
Note that this function also calls ClearTraceMasks().
*/
static void DontCreateOnDemand();
/**
Globally enable or disable logging.
Calling this function with @false argument disables all log messages
for the current thread.
@see wxLogNull, IsEnabled()
@return
The old state, i.e. @true if logging was previously enabled and
@false if it was disabled.
*/
static bool EnableLogging(bool enable = true);
/**
Shows all the messages currently in buffer and clears it.
If the buffer is already empty, nothing happens.
If you override this method in a derived class, call the base class
version first, before doing anything else.
*/
virtual void Flush();
/**
Flushes the current log target if any, does nothing if there is none.
When this method is called from the main thread context, it also
flushes any previously buffered messages logged by the other threads.
When it is called from the other threads it simply calls Flush() on the
currently active log target, so it mostly makes sense to do this if a
thread has its own logger set with SetThreadActiveTarget().
*/
static void FlushActive();
/**
Returns the pointer to the active log target (may be @NULL).
@@ -798,6 +686,86 @@ public:
*/
static wxLog* GetActiveTarget();
/**
Sets the specified log target as the active one.
Returns the pointer to the previous active log target (may be @NULL).
To suppress logging use a new instance of wxLogNull not @NULL. If the
active log target is set to @NULL a new default log target will be
created when logging occurs.
@see SetThreadActiveTarget()
*/
static wxLog* SetActiveTarget(wxLog* logtarget);
/**
Sets a thread-specific log target.
The log target passed to this function will be used for all messages
logged by the current thread using the usual wxLog functions. This
shouldn't be called from the main thread which never uses a thread-
specific log target but can be used for the other threads to handle
thread logging completely separately; instead of buffering thread log
messages in the main thread logger.
Notice that unlike for SetActiveTarget(), wxWidgets does not destroy
the thread-specific log targets when the thread terminates so doing
this is your responsibility.
This method is only available if @c wxUSE_THREADS is 1, i.e. wxWidgets
was compiled with threads support.
@param logger
The new thread-specific log target, possibly @NULL.
@return
The previous thread-specific log target, initially @NULL.
@since 2.9.1
*/
static wxLog *SetThreadActiveTarget(wxLog *logger);
/**
Flushes the current log target if any, does nothing if there is none.
When this method is called from the main thread context, it also
flushes any previously buffered messages logged by the other threads.
When it is called from the other threads it simply calls Flush() on the
currently active log target, so it mostly makes sense to do this if a
thread has its own logger set with SetThreadActiveTarget().
*/
static void FlushActive();
/**
Resumes logging previously suspended by a call to Suspend().
All messages logged in the meanwhile will be flushed soon.
*/
static void Resume();
/**
Suspends the logging until Resume() is called.
Note that the latter must be called the same number of times as the former
to undo it, i.e. if you call Suspend() twice you must call Resume() twice as well.
Note that suspending the logging means that the log sink won't be be flushed
periodically, it doesn't have any effect if the current log target does the
logging immediately without waiting for Flush() to be called (the standard
GUI log target only shows the log dialog when it is flushed, so Suspend()
works as expected with it).
@see Resume(), wxLogNull
*/
static void Suspend();
//@}
/**
@name Log level functions
*/
//@{
/**
Returns the current log level limit.
@@ -807,49 +775,7 @@ public:
@see SetLogLevel(), IsLevelEnabled()
*/
static wxLogLevel GetLogLevel();
/**
Returns whether the repetition counting mode is enabled.
*/
static bool GetRepetitionCounting();
/**
Returns the current timestamp format string.
*/
static const wxString& GetTimestamp();
/**
@deprecated
Returns the current trace mask, see Customization() section for details.
*/
static wxTraceMask GetTraceMask();
/**
Returns the currently allowed list of string trace masks.
@see AddTraceMask().
*/
static const wxArrayString& GetTraceMasks();
/**
Returns whether the verbose mode is currently active.
*/
static bool GetVerbose();
/**
Returns @true if the @a mask is one of allowed masks for wxLogTrace().
See also: AddTraceMask(), RemoveTraceMask()
*/
static bool IsAllowedTraceMask(const wxString& mask);
/**
Returns true if logging is enabled at all now.
@see IsLevelEnabled(), EnableLogging()
*/
static bool IsEnabled();
/**
Returns true if logging at this level is enabled for the current thread.
@@ -863,32 +789,6 @@ public:
*/
static bool IsLevelEnabled(wxLogLevel level, wxString component);
/**
Remove the @a mask from the list of allowed masks for
wxLogTrace().
@see AddTraceMask()
*/
static void RemoveTraceMask(const wxString& mask);
/**
Resumes logging previously suspended by a call to Suspend().
All messages logged in the meanwhile will be flushed soon.
*/
static void Resume();
/**
Sets the specified log target as the active one.
Returns the pointer to the previous active log target (may be @NULL).
To suppress logging use a new instance of wxLogNull not @NULL. If the
active log target is set to @NULL a new default log target will be
created when logging occurs.
@see SetThreadActiveTarget()
*/
static wxLog* SetActiveTarget(wxLog* logtarget);
/**
Sets the log level for the given component.
@@ -918,6 +818,41 @@ public:
@see SetComponentLevel()
*/
static void SetLogLevel(wxLogLevel logLevel);
//@}
/**
@name Enable/disable features functions
*/
//@{
/**
Globally enable or disable logging.
Calling this function with @false argument disables all log messages
for the current thread.
@see wxLogNull, IsEnabled()
@return
The old state, i.e. @true if logging was previously enabled and
@false if it was disabled.
*/
static bool EnableLogging(bool enable = true);
/**
Returns true if logging is enabled at all now.
@see IsLevelEnabled(), EnableLogging()
*/
static bool IsEnabled();
/**
Returns whether the repetition counting mode is enabled.
*/
static bool GetRepetitionCounting();
/**
Enables logging mode in which a log message is logged once, and in case exactly
@@ -925,32 +860,11 @@ public:
repetitions is logged.
*/
static void SetRepetitionCounting(bool repetCounting = true);
/**
Sets a thread-specific log target.
The log target passed to this function will be used for all messages
logged by the current thread using the usual wxLog functions. This
shouldn't be called from the main thread which never uses a thread-
specific log target but can be used for the other threads to handle
thread logging completely separately; instead of buffering thread log
messages in the main thread logger.
Notice that unlike for SetActiveTarget(), wxWidgets does not destroy
the thread-specific log targets when the thread terminates so doing
this is your responsibility.
This method is only available if @c wxUSE_THREADS is 1, i.e. wxWidgets
was compiled with threads support.
@param logger
The new thread-specific log target, possibly @NULL.
@return
The previous thread-specific log target, initially @NULL.
@since 2.9.1
*/
static wxLog *SetThreadActiveTarget(wxLog *logger);
Returns the current timestamp format string.
*/
static const wxString& GetTimestamp();
/**
Sets the timestamp format prepended by the default log targets to all
@@ -966,35 +880,39 @@ public:
@since 2.9.0
*/
static void DisableTimestamp();
/**
@deprecated
Sets the trace mask, see @ref log_tracemasks section for details.
Returns whether the verbose mode is currently active.
*/
static void SetTraceMask(wxTraceMask mask);
static bool GetVerbose();
/**
Activates or deactivates verbose mode in which the verbose messages are
logged as the normal ones instead of being silently dropped.
The verbose messages are the trace messages which are not disabled in the
release mode and are generated by wxLogVerbose().
@see @ref overview_log
*/
static void SetVerbose(bool verbose = true);
//@}
/**
Suspends the logging until Resume() is called.
Some of wxLog implementations, most notably the standard wxLogGui class,
buffer the messages (for example, to avoid showing the user a zillion of modal
message boxes one after another -- which would be really annoying).
This function shows them all and clears the buffer contents.
If the buffer is already empty, nothing happens.
Note that the latter must be called the same number of times as the former
to undo it, i.e. if you call Suspend() twice you must call Resume() twice as well.
Note that suspending the logging means that the log sink won't be be flushed
periodically, it doesn't have any effect if the current log target does the
logging immediately without waiting for Flush() to be called (the standard
GUI log target only shows the log dialog when it is flushed, so Suspend()
works as expected with it).
@see Resume(), wxLogNull
If you override this method in a derived class, call the base class
version first, before doing anything else.
*/
static void Suspend();
virtual void Flush();
/**
Log the given record.