diff options
Diffstat (limited to 'src/widgets')
| -rw-r--r-- | src/widgets/kernel/qapplication.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp index e761520228..78c842f7e1 100644 --- a/src/widgets/kernel/qapplication.cpp +++ b/src/widgets/kernel/qapplication.cpp @@ -117,6 +117,14 @@ static void initResources() QT_BEGIN_NAMESPACE +// Helper macro for static functions to check on the existence of the application class. +#define CHECK_QAPP_INSTANCE(...) \ + if (Q_LIKELY(QCoreApplication::instance())) { \ + } else { \ + qWarning("Must construct a QApplication first."); \ + return __VA_ARGS__; \ + } + Q_CORE_EXPORT void qt_call_post_routines(); QApplicationPrivate *QApplicationPrivate::self = 0; @@ -2855,6 +2863,7 @@ void QApplicationPrivate::sendSyntheticEnterLeave(QWidget *widget) */ QDesktopWidget *QApplication::desktop() { + CHECK_QAPP_INSTANCE(Q_NULLPTR) if (!qt_desktopWidget || // not created yet !(qt_desktopWidget->windowType() == Qt::Desktop)) { // reparented away qt_desktopWidget = new QDesktopWidget(); @@ -4110,6 +4119,7 @@ void QApplication::setEffectEnabled(Qt::UIEffect effect, bool enable) */ bool QApplication::isEffectEnabled(Qt::UIEffect effect) { + CHECK_QAPP_INSTANCE(false) return QColormap::instance().depth() >= 16 && (QApplicationPrivate::enabledAnimations & QPlatformTheme::GeneralUiEffect) && (QApplicationPrivate::enabledAnimations & uiEffectToFlag(effect)); |