logg.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        src/generic/logg.cpp
// Purpose:     wxLog-derived classes which need GUI support (the rest is in
//              src/common/log.cpp)
// Author:      Vadim Zeitlin
// Modified by:
// Created:     20.09.99 (extracted from src/common/log.cpp)
// RCS-ID:      $Id: logg.cpp,v 1.94 2005/06/20 00:24:21 VZ Exp $
// Copyright:   (c) 1998 Vadim Zeitlin <[e-mail]>
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma implementation "logg.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/button.h"
    #include "wx/intl.h"
    #include "wx/log.h"
    #include "wx/menu.h"
    #include "wx/frame.h"
    #include "wx/filedlg.h"
    #include "wx/msgdlg.h"
    #include "wx/textctrl.h"
    #include "wx/sizer.h"
    #include "wx/statbmp.h"
    #include "wx/button.h"
    #include "wx/settings.h"
#endif // WX_PRECOMP

#if wxUSE_LOGGUI || wxUSE_LOGWINDOW

#include "wx/file.h"
#include "wx/textfile.h"
#include "wx/statline.h"
#include "wx/artprov.h"

#ifdef  __WXMSW__
  // for OutputDebugString()
  #include  "wx/msw/private.h"
#endif // Windows

#ifdef  __WXPM__
  #include <time.h>
#endif

#if wxUSE_LOG_DIALOG
    #include "wx/listctrl.h"
    #include "wx/imaglist.h"
    #include "wx/image.h"
#else // !wxUSE_LOG_DIALOG
    #include "wx/msgdlg.h"
#endif // wxUSE_LOG_DIALOG/!wxUSE_LOG_DIALOG

#if defined(__MWERKS__) && wxUSE_UNICODE
    #include <wtime.h>
#endif

#include "wx/datetime.h"

// the suffix we add to the button to show that the dialog can be expanded
#define EXPAND_SUFFIX _T(" >>")

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

#if wxUSE_LOG_DIALOG

// this function is a wrapper around strftime(3)
// allows to exclude the usage of wxDateTime
static wxString TimeStamp(const wxChar *format, time_t t)
{
    wxChar buf[4096];
    if ( !wxStrftime(buf, WXSIZEOF(buf), format, localtime(&t)) )
    {
        // buffer is too small?
        wxFAIL_MSG(_T("strftime() failed"));
    }
    return wxString(buf);
}


class wxLogDialog : public wxDialog
{
public:
    wxLogDialog(wxWindow *parent,
                const wxArrayString& messages,
                const wxArrayInt& severity,
                const wxArrayLong& timess,
                const wxString& caption,
                long style);
    virtual ~wxLogDialog();

    // event handlers
    void OnOk(wxCommandEvent& event);
    void OnDetails(wxCommandEvent& event);
#if wxUSE_FILE
    void OnSave(wxCommandEvent& event);
#endif // wxUSE_FILE
    void OnListSelect(wxListEvent& event);

private:
    // create controls needed for the details display
    void CreateDetailsControls();

    // the data for the listctrl
    wxArrayString m_messages;
    wxArrayInt m_severity;
    wxArrayLong m_times;

    // the "toggle" button and its state
#ifndef __SMARTPHONE__
    wxButton *m_btnDetails;
#endif
    bool      m_showingDetails;

    // the controls which are not shown initially (but only when details
    // button is pressed)
    wxListCtrl *m_listctrl;
#ifndef __SMARTPHONE__
#if wxUSE_STATLINE
    wxStaticLine *m_statline;
#endif // wxUSE_STATLINE
#if wxUSE_FILE
    wxButton *m_btnSave;
#endif // wxUSE_FILE
#endif // __SMARTPHONE__

    // the translated "Details" string
    static wxString ms_details;

    DECLARE_EVENT_TABLE()
    DECLARE_NO_COPY_CLASS(wxLogDialog)
};

BEGIN_EVENT_TABLE(wxLogDialog, wxDialog)
    EVT_BUTTON(wxID_OK, wxLogDialog::OnOk)
    EVT_BUTTON(wxID_MORE,   wxLogDialog::OnDetails)
#if wxUSE_FILE
    EVT_BUTTON(wxID_SAVE,   wxLogDialog::OnSave)
#endif // wxUSE_FILE
    EVT_LIST_ITEM_SELECTED(wxID_ANY, wxLogDialog::OnListSelect)
END_EVENT_TABLE()

#endif // wxUSE_LOG_DIALOG

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

#if wxUSE_FILE && wxUSE_FILEDLG

// pass an uninitialized file object, the function will ask the user for the
// filename and try to open it, returns true on success (file was opened),
// false if file couldn't be opened/created and -1 if the file selection
// dialog was cancelled
static int OpenLogFile(wxFile& file, wxString *filename = NULL, wxWindow *parent = NULL);

#endif // wxUSE_FILE

// ----------------------------------------------------------------------------
// global variables
// ----------------------------------------------------------------------------

// we use a global variable to store the frame pointer for wxLogStatus - bad,
// but it's the easiest way
static wxFrame *gs_pFrame = NULL; // FIXME MT-unsafe

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// global functions
// ----------------------------------------------------------------------------

// accepts an additional argument which tells to which frame the output should
// be directed
void wxVLogStatus(wxFrame *pFrame, const wxChar *szFormat, va_list argptr)
{
  wxString msg;

  wxLog *pLog = wxLog::GetActiveTarget();
  if ( pLog != NULL ) {
    msg.PrintfV(szFormat, argptr);

    wxASSERT( gs_pFrame == NULL ); // should be reset!
    gs_pFrame = pFrame;
#ifdef __WXWINCE__
    wxLog::OnLog(wxLOG_Status, msg, 0);
#else
    wxLog::OnLog(wxLOG_Status, msg, time(NULL));
#endif
    gs_pFrame = (wxFrame *) NULL;
  }
}

void wxLogStatus(wxFrame *pFrame, const wxChar *szFormat, ...)
{
    va_list argptr;
    va_start(argptr, szFormat);
    wxVLogStatus(pFrame, szFormat, argptr);
    va_end(argptr);
}

// ----------------------------------------------------------------------------
// wxLogGui implementation (FIXME MT-unsafe)
// ----------------------------------------------------------------------------

#if wxUSE_LOGGUI

wxLogGui::wxLogGui()
{
    Clear();
}

void wxLogGui::Clear()
{
    m_bErrors =
    m_bWarnings =
    m_bHasMessages = false;

    m_aMessages.Empty();
    m_aSeverity.Empty();
    m_aTimes.Empty();
}

void wxLogGui::Flush()
{
    if ( !m_bHasMessages )
        return;

    // do it right now to block any new calls to Flush() while we're here
    m_bHasMessages = false;

    wxString appName = wxTheApp->GetAppName();
    if ( !appName.empty() )
        appName[0u] = (wxChar)wxToupper(appName[0u]);

    long style;
    wxString titleFormat;
    if ( m_bErrors ) {
        titleFormat = _("%s Error");
        style = wxICON_STOP;
    }
    else if ( m_bWarnings ) {
        titleFormat = _("%s Warning");
        style = wxICON_EXCLAMATION;
    }
    else {
        titleFormat = _("%s Information");
        style = wxICON_INFORMATION;
    }

    wxString title;
    title.Printf(titleFormat, appName.c_str());

    size_t nMsgCount = m_aMessages.Count();

    // avoid showing other log dialogs until we're done with the dialog we're
    // showing right now: nested modal dialogs make for really bad UI!
    Suspend();

    wxString str;
    if ( nMsgCount == 1 )
    {
        str = m_aMessages[0];
    }
    else // more than one message
    {
#if wxUSE_LOG_DIALOG

        wxLogDialog dlg(NULL,
                        m_aMessages, m_aSeverity, m_aTimes,
                        title, style);

        // clear the message list before showing the dialog because while it's
        // shown some new messages may appear
        Clear();

        (void)dlg.ShowModal();
#else // !wxUSE_LOG_DIALOG
        // concatenate all strings (but not too many to not overfill the msg box)
        size_t nLines = 0;

        // start from the most recent message
        for ( size_t n = nMsgCount; n > 0; n-- ) {
            // for Windows strings longer than this value are wrapped (NT 4.0)
            const size_t nMsgLineWidth = 156;

            nLines += (m_aMessages[n - 1].Len() + nMsgLineWidth - 1) / nMsgLineWidth;

            if ( nLines > 25 )  // don't put too many lines in message box
                break;

            str << m_aMessages[n - 1] << wxT("\n");
        }
#endif // wxUSE_LOG_DIALOG/!wxUSE_LOG_DIALOG
    }

    // this catches both cases of 1 message with wxUSE_LOG_DIALOG and any
    // situation without it
    if ( !str.empty() )
    {
        wxMessageBox(str, title, wxOK | style);

        // no undisplayed messages whatsoever
        Clear();
    }

    // allow flushing the logs again
    Resume();
}

// log all kinds of messages
void wxLogGui::DoLog(wxLogLevel level, const wxChar *szString, time_t t)
{
    switch ( level ) {
        case wxLOG_Info:
            if ( GetVerbose() )
        case wxLOG_Message:
            {
                m_aMessages.Add(szString);
                m_aSeverity.Add(wxLOG_Message);
                m_aTimes.Add((long)t);
                m_bHasMessages = true;
            }
            break;

        case wxLOG_Status:
#if wxUSE_STATUSBAR
            {
                // find the top window and set it's status text if it has any
                wxFrame *pFrame = gs_pFrame;
                if ( pFrame == NULL ) {
                    wxWindow *pWin = wxTheApp->GetTopWindow();
                    if ( pWin != NULL && pWin->IsKindOf(CLASSINFO(wxFrame)) ) {
                        pFrame = (wxFrame *)pWin;
                    }
                }

                if ( pFrame && pFrame->GetStatusBar() )
                    pFrame->SetStatusText(szString);
            }
#endif // wxUSE_STATUSBAR
            break;

        case wxLOG_Trace:
        case wxLOG_Debug:
            #ifdef __WXDEBUG__
            {
                wxString str;
                TimeStamp(&str);
                str += szString;

                #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
                    // don't prepend debug/trace here: it goes to the
                    // debug window anyhow
                    str += wxT("\r\n");
                    OutputDebugString(str);
                #else
                    // send them to stderr
                    wxFprintf(stderr, wxT("[%s] %s\n"),
                              level == wxLOG_Trace ? wxT("Trace")
                                                   : wxT("Debug"),
                              str.c_str());
                    fflush(stderr);
                #endif
            }
            #endif // __WXDEBUG__

            break;

        case wxLOG_FatalError:
            // show this one immediately
            wxMessageBox(szString, _("Fatal error"), wxICON_HAND);
            wxExit();
            break;

        case wxLOG_Error:
            if ( !m_bErrors ) {
#if !wxUSE_LOG_DIALOG
                // discard earlier informational messages if this is the 1st
                // error because they might not make sense any more and showing
                // them in a message box might be confusing
                m_aMessages.Empty();
                m_aSeverity.Empty();
                m_aTimes.Empty();
#endif // wxUSE_LOG_DIALOG
                m_bErrors = true;
            }