some != NULL checks

[wxWidgets.git] / src / gtk / app.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        app.cpp
// Purpose:
// Author:      Robert Roebling
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling, Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
    #pragma implementation "app.h"
#endif

#include "wx/app.h"
#include "wx/gdicmn.h"
#include "wx/utils.h"
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/memory.h"
#include "wx/font.h"
#include "wx/settings.h"
#include "wx/dialog.h"

#if wxUSE_WX_RESOURCES
    #include "wx/resource.h"
#endif

#include "wx/module.h"
#include "wx/image.h"

#if wxUSE_THREADS
#include "wx/thread.h"
#endif

#include <unistd.h>

#include <glib.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>

#include "wx/gtk/win_gtk.h"

//-----------------------------------------------------------------------------
// global data
//-----------------------------------------------------------------------------

wxApp *wxTheApp = (wxApp *)  NULL;
wxAppInitializerFunction wxAppBase::m_appInitFn = (wxAppInitializerFunction) NULL;

extern bool g_isIdle;

bool g_mainThreadLocked = FALSE;

GtkWidget *wxRootWindow = (GtkWidget*) NULL;

//-----------------------------------------------------------------------------
// local functions
//-----------------------------------------------------------------------------

/* forward declaration */
gint   wxapp_idle_callback( gpointer WXUNUSED(data) );
void   wxapp_install_idle_handler();

#if wxUSE_THREADS
gint   wxapp_wakeup_timerout_callback( gpointer WXUNUSED(data) );
#endif

//-----------------------------------------------------------------------------
// wxExit
//-----------------------------------------------------------------------------

void wxExit()
{
    gtk_main_quit();
}

//-----------------------------------------------------------------------------
// wxYield
//-----------------------------------------------------------------------------

bool wxYield()
{
    bool has_idle = (wxTheApp->m_idleTag != 0);

    if (has_idle)
    {
        /* We need to temporarily remove idle callbacks or the loop will
           never finish. */
        gtk_idle_remove( wxTheApp->m_idleTag );
        wxTheApp->m_idleTag = 0;
    }

    while (gtk_events_pending())
        gtk_main_iteration();

    if (has_idle)
    {
        /* re-add idle handler (very low priority) */
        wxTheApp->m_idleTag = gtk_idle_add_priority( 500, wxapp_idle_callback, (gpointer) NULL );
    }

    // disable log flushing from here because a call to wxYield() shouldn't
    // normally result in message boxes popping up &c
    wxLog::Suspend();

    /* it's necessary to call ProcessIdle() to update the frames sizes which
       might have been changed (it also will update other things set from
       OnUpdateUI() which is a nice (and desired) side effect) */
    while (wxTheApp->ProcessIdle())
        ;

    // let the logs be flashed again
    wxLog::Resume();

    return TRUE;
}

//-----------------------------------------------------------------------------
// wxWakeUpIdle
//-----------------------------------------------------------------------------

void wxWakeUpIdle()
{
#if wxUSE_THREADS
    if (!wxThread::IsMain())
        wxMutexGuiEnter();
#endif

    if (g_isIdle)
        wxapp_install_idle_handler();

#if wxUSE_THREADS
    if (!wxThread::IsMain())
        wxMutexGuiLeave();
#endif
}

//-----------------------------------------------------------------------------
// local functions
//-----------------------------------------------------------------------------

gint wxapp_idle_callback( gpointer WXUNUSED(data) )
{
    if (!wxTheApp) return TRUE;

    // when getting called from GDK's time-out handler
    // we are no longer within GDK's grab on the GUI
    // thread so we must lock it here ourselves
    gdk_threads_enter();

    /* we don't want any more idle events until the next event is
       sent to wxGTK */
    gtk_idle_remove( wxTheApp->m_idleTag );
    wxTheApp->m_idleTag = 0;

    /* indicate that we are now in idle mode - even so deeply
       in idle mode that we don't get any idle events anymore.
       this is like wxMSW where an idle event is sent only
       once each time after the event queue has been completely
       emptied */
    g_isIdle = TRUE;

    /* sent idle event to all who request them */
    while (wxTheApp->ProcessIdle()) { }

    // release lock again
    gdk_threads_leave();

    return TRUE;
}

void wxapp_install_idle_handler()
{
    wxASSERT_MSG( wxTheApp->m_idleTag == 0, wxT("attempt to install idle handler twice") );

    /* This routine gets called by all event handlers
       indicating that the idle is over. It may also
       get called from other thread for sending events
       to the main thread (and processing these in
       idle time). Very low priority. */

    wxTheApp->m_idleTag = gtk_idle_add_priority( 500, wxapp_idle_callback, (gpointer) NULL );

    g_isIdle = FALSE;
}

#if wxUSE_THREADS

void wxapp_install_thread_wakeup()
{
    if (wxTheApp->m_wakeUpTimerTag) return;

    wxTheApp->m_wakeUpTimerTag = gtk_timeout_add( 50, wxapp_wakeup_timerout_callback, (gpointer) NULL );
}

void wxapp_uninstall_thread_wakeup()
{
    if (!wxTheApp->m_wakeUpTimerTag) return;

    gtk_timeout_remove( wxTheApp->m_wakeUpTimerTag );
    wxTheApp->m_wakeUpTimerTag = 0;
}

gint wxapp_wakeup_timerout_callback( gpointer WXUNUSED(data) )
{
    // when getting called from GDK's time-out handler
    // we are no longer within GDK's grab on the GUI
    // thread so we must lock it here ourselves
    gdk_threads_enter();

    wxapp_uninstall_thread_wakeup();

    // unblock other threads wishing to do some GUI things
    wxMutexGuiLeave();

    g_mainThreadLocked = TRUE;

    // wake up other threads
    wxUsleep( 1 );

    // block other thread again
    wxMutexGuiEnter();

    g_mainThreadLocked = FALSE;

    wxapp_install_thread_wakeup();

    // release lock again
    gdk_threads_leave();

    return TRUE;
}

#endif // wxUSE_THREADS

//-----------------------------------------------------------------------------
// wxApp
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxApp,wxEvtHandler)

BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
    EVT_IDLE(wxApp::OnIdle)
END_EVENT_TABLE()

wxApp::wxApp()
{
    wxTheApp = this;

    m_topWindow = (wxWindow *) NULL;
    m_exitOnFrameDelete = TRUE;

    m_idleTag = gtk_idle_add( wxapp_idle_callback, (gpointer) NULL );

#if wxUSE_THREADS
    m_wakeUpTimerTag = 0;
    wxapp_install_thread_wakeup();
#endif

    m_colorCube = (unsigned char*) NULL;

    m_useBestVisual = FALSE;
}

wxApp::~wxApp()
{
    if (m_idleTag) gtk_idle_remove( m_idleTag );

#if wxUSE_THREADS
    wxapp_uninstall_thread_wakeup();
#endif

    if (m_colorCube) free(m_colorCube);
}

bool wxApp::OnInitGui()
{
    GdkVisual *visual = gdk_visual_get_system();

    /* on some machines, the default visual is just 256 colours, so
       we make sure we get the best. this can sometimes be wasteful,
       of course, but what do these guys pay $30.000 for? */

    if ((gdk_visual_get_best() != gdk_visual_get_system()) &&
        (m_useBestVisual))
    {
        GdkVisual* vis = gdk_visual_get_best();
        gtk_widget_set_default_visual( vis );

        GdkColormap *colormap = gdk_colormap_new( vis, FALSE );
        gtk_widget_set_default_colormap( colormap );

        visual = vis;
    }

    /* Nothing to do for 15, 16, 24, 32 bit displays */
    if (visual->depth > 8) return TRUE;

    /* initialize color cube for 8-bit color reduction dithering */

    GdkColormap *cmap = gtk_widget_get_default_colormap();

    m_colorCube = (unsigned char*)malloc(32 * 32 * 32);

    for (int r = 0; r < 32; r++)
    {
        for (int g = 0; g < 32; g++)
        {
            for (int b = 0; b < 32; b++)
            {
                int rr = (r << 3) | (r >> 2);
                int gg = (g << 3) | (g >> 2);
                int bb = (b << 3) | (b >> 2);

                int index = -1;

                GdkColor *colors = cmap->colors;
                if (colors)
                {
                    int max = 3 * 65536;

                    for (int i = 0; i < cmap->size; i++)
                    {
                        int rdiff = ((rr << 8) - colors[i].red);
                        int gdiff = ((gg << 8) - colors[i].green);
                        int bdiff = ((bb << 8) - colors[i].blue);
                        int sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);
                        if (sum < max)
                        {
                            index = i; max = sum;
                        }
                    }
                }
                else
                {
#if (GTK_MINOR_VERSION > 0)
                    /* assume 8-bit true or static colors. this really
                       exists. */
                    GdkVisual* vis = gdk_colormap_get_visual( cmap );
                    index = (r >> (5 - vis->red_prec)) << vis->red_shift;
                    index |= (g >> (5 - vis->green_prec)) << vis->green_shift;
                    index |= (b >> (5 - vis->blue_prec)) << vis->blue_shift;
#else
                    wxFAIL_MSG( wxT("Unsupported graphics hardware") );
#endif
                }
                m_colorCube[ (r*1024) + (g*32) + b ] = index;
            }
        }
    }

    return TRUE;
}

bool wxApp::ProcessIdle()
{
    wxIdleEvent event;
    event.SetEventObject( this );
    ProcessEvent( event );

    return event.MoreRequested();
}

void wxApp::OnIdle( wxIdleEvent &event )
{
    static bool s_inOnIdle = FALSE;

    /* Avoid recursion (via ProcessEvent default case) */
    if (s_inOnIdle)
        return;

    s_inOnIdle = TRUE;

    /* Resend in the main thread events which have been prepared in other
       threads */
    ProcessPendingEvents();

    /* 'Garbage' collection of windows deleted with Close(). */
    DeletePendingObjects();

    /* Send OnIdle events to all windows */
    bool needMore = SendIdleEvents();

    if (needMore)
        event.RequestMore(TRUE);

    s_inOnIdle = FALSE;

    /* flush the logged messages if any */
#if wxUSE_LOG
    wxLog::FlushActive();
#endif // wxUSE_LOG
}

bool wxApp::SendIdleEvents()
{
    bool needMore = FALSE;

    wxWindowList::Node* node = wxTopLevelWindows.GetFirst();
    while (node)
    {
        wxWindow* win = node->GetData();
        if (SendIdleEvents(win))
            needMore = TRUE;
        node = node->GetNext();
    }

    return needMore;
}

bool wxApp::SendIdleEvents( wxWindow* win )
{
    bool needMore = FALSE;

    wxIdleEvent event;
    event.SetEventObject(win);

    win->ProcessEvent(event);

    win->OnInternalIdle();

    if (event.MoreRequested())
        needMore = TRUE;

    wxNode* node = win->GetChildren().First();
    while (node)
    {
        wxWindow* win = (wxWindow*) node->Data();
        if (SendIdleEvents(win))
            needMore = TRUE;

        node = node->Next();
    }
    return needMore ;
}

int wxApp::MainLoop()
{
    gtk_main();
    return 0;
}

void wxApp::ExitMainLoop()
{
    if (gtk_main_level() > 0)
        gtk_main_quit();
}

bool wxApp::Initialized()
{
    return m_initialized;
}

bool wxApp::Pending()
{
    return (gtk_events_pending() > 0);
}

void wxApp::Dispatch()
{
    gtk_main_iteration();
}

void wxApp::DeletePendingObjects()
{
    wxNode *node = wxPendingDelete.First();
    while (node)
    {
        wxObject *obj = (wxObject *)node->Data();

        delete obj;

        if (wxPendingDelete.Find(obj))
            delete node;

        node = wxPendingDelete.First();
    }
}

bool wxApp::Initialize()
{
    wxBuffer = new wxChar[BUFSIZ + 512];

    wxClassInfo::InitializeClasses();

    wxSystemSettings::Init();

    // GL: I'm annoyed ... I don't know where to put this and I don't want to
    // create a module for that as it's part of the core.
#if wxUSE_THREADS
    wxPendingEvents = new wxList();
    wxPendingEventsLocker = new wxCriticalSection();
#endif

    wxTheColourDatabase = new wxColourDatabase( wxKEY_STRING );
    wxTheColourDatabase->Initialize();

    wxInitializeStockLists();
    wxInitializeStockObjects();

#if wxUSE_WX_RESOURCES
    wxInitializeResourceSystem();
#endif

    wxModule::RegisterModules();
    if (!wxModule::InitializeModules()) return FALSE;

    return TRUE;
}

void wxApp::CleanUp()
{
    wxModule::CleanUpModules();

#if wxUSE_WX_RESOURCES
    wxCleanUpResourceSystem();
#endif

    if (wxTheColourDatabase)
        delete wxTheColourDatabase;

    wxTheColourDatabase = (wxColourDatabase*) NULL;

    wxDeleteStockObjects();

    wxDeleteStockLists();

    delete wxTheApp;
    wxTheApp = (wxApp*) NULL;

    // GL: I'm annoyed ... I don't know where to put this and I don't want to
    // create a module for that as it's part of the core.
#if wxUSE_THREADS
    delete wxPendingEvents;
    delete wxPendingEventsLocker;
#endif

    wxSystemSettings::Done();

    delete[] wxBuffer;

    wxClassInfo::CleanUpClasses();

    // check for memory leaks
#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
    if (wxDebugContext::CountObjectsLeft() > 0)
    {
        wxLogDebug(wxT("There were memory leaks.\n"));
        wxDebugContext::Dump();
        wxDebugContext::PrintStatistics();
    }
#endif // Debug

#if wxUSE_LOG
    // do this as the very last thing because everything else can log messages
    wxLog::DontCreateOnDemand();

    wxLog *oldLog = wxLog::SetActiveTarget( (wxLog*) NULL );
    if (oldLog)
        delete oldLog;
#endif // wxUSE_LOG
}

//-----------------------------------------------------------------------------
// wxEntry
//-----------------------------------------------------------------------------


int wxEntryStart( int argc, char *argv[] )
{
#if wxUSE_THREADS
    /* GTK 1.2 up to version 1.2.3 has broken threads */
    if ((gtk_major_version == 1) &&
        (gtk_minor_version == 2) &&
        (gtk_micro_version < 4))
    {
        printf( "wxWindows warning: GUI threading disabled due to outdated GTK version\n" );
    }
    else
    {
        g_thread_init(NULL);
    }
#endif

    gtk_set_locale();

#if wxUSE_WCHAR_T
    if (!wxOKlibc()) wxConvCurrent = &wxConvLocal;
#else
    if (!wxOKlibc()) wxConvCurrent = (wxMBConv*) NULL;
#endif

    gdk_threads_enter();

    gtk_init( &argc, &argv );

    wxSetDetectableAutoRepeat( TRUE );

    if (!wxApp::Initialize())
    {
        gdk_threads_leave();
        return -1;
    }

    return 0;
}


int wxEntryInitGui()
{
    int retValue = 0;

    if ( !wxTheApp->OnInitGui() )
        retValue = -1;

    wxRootWindow = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    gtk_widget_realize( wxRootWindow );

    return retValue;
}


void wxEntryCleanup()
{
#if wxUSE_LOG
    // flush the logged messages if any
    wxLog *log = wxLog::GetActiveTarget();
    if (log != NULL && log->HasPendingMessages())
        log->Flush();

    // continuing to use user defined log target is unsafe from now on because
    // some resources may be already unavailable, so replace it by something
    // more safe
    wxLog *oldlog = wxLog::SetActiveTarget(new wxLogStderr);
    if ( oldlog )
        delete oldlog;
#endif // wxUSE_LOG

    wxApp::CleanUp();

    gdk_threads_leave();
}



int wxEntry( int argc, char *argv[] )
{
    int err;

    err = wxEntryStart(argc, argv);
    if (err)
        return err;

    if (!wxTheApp)
    {
        wxCHECK_MSG( wxApp::GetInitializerFunction(), -1,
                     wxT("wxWindows error: No initializer - use IMPLEMENT_APP macro.\n") );

        wxAppInitializerFunction app_ini = wxApp::GetInitializerFunction();

        wxObject *test_app = app_ini();

        wxTheApp = (wxApp*) test_app;
    }

    wxCHECK_MSG( wxTheApp, -1, wxT("wxWindows error: no application object") );

    wxTheApp->argc = argc;
#if wxUSE_UNICODE
    wxTheApp->argv = new wxChar*[argc+1];
    int mb_argc = 0;
    while (mb_argc < argc)
    {
        wxTheApp->argv[mb_argc] = wxStrdup(wxConvLibc.cMB2WX(argv[mb_argc]));
        mb_argc++;
    }
    wxTheApp->argv[mb_argc] = (wxChar *)NULL;
#else
    wxTheApp->argv = argv;
#endif

    wxString name(wxFileNameFromPath(argv[0]));
    wxStripExtension( name );
    wxTheApp->SetAppName( name );

    int retValue;
    retValue = wxEntryInitGui();

    // Here frames insert themselves automatically into wxTopLevelWindows by
    // getting created in OnInit().
    if ( retValue == 0 )
    {
        if ( !wxTheApp->OnInit() )
            retValue = -1;
    }

    if ( retValue == 0 )
    {
        /* delete pending toplevel windows (typically a single
           dialog) so that, if there isn't any left, we don't
           call OnRun() */
        wxTheApp->DeletePendingObjects();

        wxTheApp->m_initialized = wxTopLevelWindows.GetCount() != 0;

        if (wxTheApp->Initialized())
        {
            wxTheApp->OnRun();

            wxWindow *topWindow = wxTheApp->GetTopWindow();
            if (topWindow)
            {
                /* Forcibly delete the window. */
                if (topWindow->IsKindOf(CLASSINFO(wxFrame)) ||
                    topWindow->IsKindOf(CLASSINFO(wxDialog)) )
                {
                    topWindow->Close( TRUE );
                    wxTheApp->DeletePendingObjects();
                }
                else
                {
                    delete topWindow;
                    wxTheApp->SetTopWindow( (wxWindow*) NULL );
                }
            }

            retValue = wxTheApp->OnExit();
        }
    }

    wxEntryCleanup();

    return retValue;
}

#include "wx/gtk/info.xpm"
#include "wx/gtk/error.xpm"
#include "wx/gtk/question.xpm"
#include "wx/gtk/warning.xpm"

wxIcon
wxApp::GetStdIcon(int which) const
{
    switch(which)
    {
        case wxICON_INFORMATION:
            return wxIcon(info_xpm);

        case wxICON_QUESTION:
            return wxIcon(question_xpm);

        case wxICON_EXCLAMATION:
            return wxIcon(warning_xpm);

        default:
            wxFAIL_MSG(wxT("requested non existent standard icon"));
            // still fall through

        case wxICON_HAND:
            return wxIcon(error_xpm);
    }
}