qapplication.cpp

奇趣公司比较新的qt/emd版本

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#include "qabstracteventdispatcher.h"
#include "qaccessible.h"
#include "qapplication.h"
#include "qclipboard.h"
#include "qcursor.h"
#include "qdesktopwidget.h"
#include "qdir.h"
#include "qevent.h"
#include "qfile.h"
#include "qfileinfo.h"
#include "qhash.h"
#include "qset.h"
#include "qlayout.h"
#include "qsessionmanager.h"
#include "qstyle.h"
#include "qstylefactory.h"
#include "qtextcodec.h"
#include "qtranslator.h"
#include "qvariant.h"
#include "qwidget.h"
#include "qdnd_p.h"
#include "qcolormap.h"
#include "qdebug.h"
#include "private/qstylesheetstyle_p.h"
#include "private/qstyle_p.h"
#include "qmessagebox.h"

#include "qinputcontext.h"
#include "qkeymapper_p.h"

#ifdef Q_WS_X11
#include <private/qt_x11_p.h>
#include "qinputcontextfactory.h"
#endif

#include <qthread.h>
#include <private/qthread_p.h>

#include <private/qfont_p.h>

#include <stdlib.h>

extern void qt_call_post_routines();


#include "qapplication_p.h"
#include "qwidget_p.h"

#include "qapplication.h"

int QApplicationPrivate::app_compile_version = 0x040000; //we don't know exactly, but it's at least 4.0.0

QApplication::Type qt_appType=QApplication::Tty;
QApplicationPrivate *QApplicationPrivate::self = 0;

QInputContext *QApplicationPrivate::inputContext;

bool QApplicationPrivate::quitOnLastWindowClosed = true;
bool QApplicationPrivate::tryEmitLastWindowClosedPending = false;

QApplicationPrivate::QApplicationPrivate(int &argc, char **argv, QApplication::Type type)
    : QCoreApplicationPrivate(argc, argv)
{
    application_type = type;
    qt_appType = type;

#ifndef QT_NO_SESSIONMANAGER
    is_session_restored = false;
#endif

    quitOnLastWindowClosed = true;
    tryEmitLastWindowClosedPending = false;

#ifdef QT3_SUPPORT
    qt_compat_used = 0;
    qt_compat_resolved = 0;
    qt_tryAccelEvent = 0;
    qt_tryComposeUnicode = 0;
    qt_dispatchAccelEvent = 0;
#endif
#if defined(Q_WS_QWS) && !defined(QT_NO_DIRECTPAINTER)
    directPainters = 0;
#endif

    if (!self)
        self = this;
}

QApplicationPrivate::~QApplicationPrivate()
{
    if (self == this)
        self = 0;
}

/*!
  \class QApplication
  \brief The QApplication class manages the GUI application's control
  flow and main settings.

  \ingroup application
  \mainclass

  It contains the main event loop, where all events from the window
  system and other sources are processed and dispatched. It also
  handles the application's initialization and finalization, and
  provides session management. It also handles most system-wide and
  application-wide settings.

  For any GUI application that uses Qt, there is precisely one
  QApplication object, no matter whether the application has 0, 1, 2
  or more windows at any time. For non-GUI Qt applications, use
  QCoreApplication instead, which doesn't depend on the \l QtGui
  library.

  The QApplication object is accessible through the instance()
  function which return a pointer equivalent to the global qApp
  pointer.

  QApplication's main areas of responsibility are:
  \list

  \o It initializes the application with the user's desktop settings
  such as palette(), font() and doubleClickInterval(). It keeps track
  of these properties in case the user changes the desktop globally, for
  example through some kind of control panel.

  \o It performs event handling, meaning that it receives events
  from the underlying window system and dispatches them to the relevant
  widgets. By using sendEvent() and postEvent() you can send your own
  events to widgets.

  \o It parses common command line arguments and sets its internal
  state accordingly. See the \link QApplication::QApplication()
  constructor documentation\endlink below for more details about this.

  \o It defines the application's look and feel, which is
  encapsulated in a QStyle object. This can be changed at runtime
  with setStyle().

  \o It specifies how the application is to allocate colors.
  See setColorSpec() for details.

  \o It provides localization of strings that are visible to the user
  via translate().

  \o It provides some magical objects like the desktop() and the
  clipboard().

  \o It knows about the application's windows. You can ask which
  widget is at a certain position using widgetAt(), get a list of
  topLevelWidgets() and closeAllWindows(), etc.

  \o It manages the application's mouse cursor handling,
  see setOverrideCursor()

  \o On the X window system, it provides functions to flush and sync
  the communication stream, see flushX() and syncX().

  \o It provides support for sophisticated \link
  session.html session management \endlink. This makes it possible
  for applications to terminate gracefully when the user logs out, to
  cancel a shutdown process if termination isn't possible and even to
  preserve the entire application's state for a future session. See
  isSessionRestored(), sessionId() and commitData() and saveState()
  for details.

  \endlist

  Since the QApplication object does so much initialization, it
  \e{must} be created before any other objects related to the user
  interface are created.

  Since it also deals with common command line arguments, it is
  usually a good idea to create it \e before any interpretation or
  modification of \c argv is done in the application itself.

  \table
    \header \o{2,1} Groups of functions
    \row
     \o System settings
     \o
        desktopSettingsAware(),
        setDesktopSettingsAware(),
        cursorFlashTime(),
        setCursorFlashTime(),
        doubleClickInterval(),
        setDoubleClickInterval(),
        setKeyboardInputInterval(),
        wheelScrollLines(),
        setWheelScrollLines(),
        palette(),
        setPalette(),
        font(),
        setFont(),
        fontMetrics().

    \row
     \o Event handling
     \o
        exec(),
        processEvents(),
        exit(),
        quit().
        sendEvent(),
        postEvent(),
        sendPostedEvents(),
        removePostedEvents(),
        hasPendingEvents(),
        notify(),
        macEventFilter(),
        qwsEventFilter(),
        x11EventFilter(),
        x11ProcessEvent(),
        winEventFilter().

    \row
     \o GUI Styles
     \o
        style(),
        setStyle().

    \row
     \o Color usage
     \o
        colorSpec(),
        setColorSpec(),
        qwsSetCustomColors().

    \row
     \o Text handling
     \o
        installTranslator(),
        removeTranslator()
        translate().

    \row
     \o Widgets
     \o
        allWidgets(),
        topLevelWidgets(),
        desktop(),
        activePopupWidget(),
        activeModalWidget(),
        clipboard(),
        focusWidget(),
        winFocus(),
        activeWindow(),
        widgetAt().

    \row
     \o Advanced cursor handling
     \o
        overrideCursor(),
        setOverrideCursor(),
        restoreOverrideCursor().

    \row
     \o X Window System synchronization
     \o
        flushX(),
        syncX().

    \row
     \o Session management
     \o
        isSessionRestored(),
        sessionId(),
        commitData(),
        saveState().

    \row
     \o Miscellaneous
     \o
        closeAllWindows(),
        startingUp(),
        closingDown(),
        type().
  \endtable

    \sa QCoreApplication, QAbstractEventDispatcher, QEventLoop, QSettings
*/

/*!
    \enum QApplication::Type

    \value Tty a console application
    \value GuiClient a GUI client application
    \value GuiServer a GUI server application (for Qtopia Core)
*/

/*!
    \enum QApplication::ColorSpec

    \value NormalColor the default color allocation policy
    \value CustomColor the same as NormalColor for X11; allocates colors
    to a palette on demand under Windows
    \value ManyColor the right choice for applications that use thousands of
    colors

    See setColorSpec() for full details.
*/

/*!
    \fn QWidget *QApplication::topLevelAt(const QPoint &point)

    Returns the top-level widget at the given \a point; returns 0 if
    there is no such widget.
*/
/*!
    \fn QWidget *QApplication::topLevelAt(int x, int y)

    \overload

    Returns the top-level widget at the point (\a{x}, \a{y}); returns
    0 if there is no such widget.
*/


/*
  The qt_init() and qt_cleanup() functions are implemented in the
  qapplication_xyz.cpp file.
*/

void qt_init(QApplicationPrivate *priv, int type
#ifdef Q_WS_X11
              , Display *display = 0, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0
#endif
   );
void qt_cleanup();

Qt::MouseButtons QApplicationPrivate::mouse_buttons = Qt::NoButton;
Qt::KeyboardModifiers QApplicationPrivate::modifier_buttons = Qt::NoModifier;

QStyle *QApplicationPrivate::app_style = 0;        // default application style

#ifndef QT_NO_STYLE_STYLESHEET
QString QApplicationPrivate::styleSheet;           // default application stylesheet
#endif

int QApplicationPrivate::app_cspec = QApplication::NormalColor;
QPalette *QApplicationPrivate::app_pal = 0;        // default application palette
QPalette *QApplicationPrivate::sys_pal = 0;        // default system palette
QPalette *QApplicationPrivate::set_pal = 0;        // default palette set by programmer
QFont *QApplicationPrivate::app_font = 0;        // default application font
QFont *QApplicationPrivate::sys_font = 0;        // default system font
QFont *QApplicationPrivate::set_font = 0;        // default font set by programmer
QIcon *QApplicationPrivate::app_icon = 0;
QWidget *QApplicationPrivate::main_widget = 0;        // main application widget
QWidget *QApplicationPrivate::focus_widget = 0;        // has keyboard input focus
QWidget *QApplicationPrivate::hidden_focus_widget = 0; // will get keyboard input focus after show()
QWidget *QApplicationPrivate::active_window = 0;        // toplevel with keyboard focus
bool QApplicationPrivate::obey_desktop_settings = true;        // use winsys resources
int QApplicationPrivate::cursor_flash_time = 1000;        // text caret flash time
int QApplicationPrivate::mouse_double_click_time = 400;        // mouse dbl click limit
int QApplicationPrivate::keyboard_input_time = 400; // keyboard input interval
#ifndef QT_NO_WHEELEVENT
int QApplicationPrivate::wheel_scroll_lines = 3;                // number of lines to scroll
#endif
bool qt_is_gui_used;
bool Q_GUI_EXPORT qt_tab_all_widgets = true;
bool qt_in_tab_key_event = false;