The QSplashScreen widget provides a splash screen that can be shown during application startup.
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| QSplashScreen (const QPixmap &pixmap=QPixmap (), Qt::WindowFlags flags=Qt::EmptyFlag) |
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| QSplashScreen (QWidget *parent, const QPixmap &pixmap=QPixmap (), Qt::WindowFlags flags=Qt::EmptyFlag) |
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virtual | ~QSplashScreen () |
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void | finish (QWidget *widget) |
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QString | message () const |
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const QPixmap | pixmap () const |
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void | repaint () |
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void | setPixmap (const QPixmap &pixmap) |
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| QWidget (QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag) |
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| ~QWidget () |
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bool | acceptDrops () const |
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QString | accessibleDescription () const |
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QString | accessibleName () const |
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QList< QAction * > | actions () const |
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void | activateWindow () |
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void | addAction (QAction *action) |
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void | addActions (const QList< QAction * > &actions) |
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void | adjustSize () |
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bool | autoFillBackground () const |
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QPalette::ColorRole | backgroundRole () const |
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QBackingStore * | backingStore () const |
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QSize | baseSize () const |
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QWidget * | childAt (const QPoint &position) const |
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QWidget * | childAt (int x, int y) const |
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QRect | childrenRect () const |
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QRegion | childrenRegion () const |
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void | clearFocus () |
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void | clearMask () |
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QMargins | contentsMargins () const |
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QRect | contentsRect () const |
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Qt::ContextMenuPolicy | contextMenuPolicy () const |
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QCursor | cursor () const |
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WId | effectiveWinId () const |
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void | ensurePolished () const |
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Qt::FocusPolicy | focusPolicy () const |
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QWidget * | focusProxy () const |
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QWidget * | focusWidget () const |
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const QFont & | font () const |
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QFontInfo | fontInfo () const |
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QFontMetrics | fontMetrics () const |
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QPalette::ColorRole | foregroundRole () const |
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QRect | frameGeometry () const |
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QSize | frameSize () const |
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const QRect & | geometry () const |
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void | getContentsMargins (int *left, int *top, int *right, int *bottom) const |
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QPixmap | grab (const QRect &rectangle=QRect (QPoint (0, 0), QSize (-1,-1))) |
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void | grabGesture (Qt::GestureType gestureType, Qt::GestureFlags flags=Qt::GestureFlags ()) |
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void | grabKeyboard () |
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void | grabMouse () |
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void | grabMouse (const QCursor &cursor) |
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int | grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut) |
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QGraphicsEffect * | graphicsEffect () const |
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QGraphicsProxyWidget * | graphicsProxyWidget () const |
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bool | hasEditFocus () const |
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bool | hasFocus () const |
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virtual bool | hasHeightForWidth () const |
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bool | hasMouseTracking () const |
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int | height () const |
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virtual int | heightForWidth (int width) const |
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Qt::InputMethodHints | inputMethodHints () const |
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virtual QVariant | inputMethodQuery (Qt::InputMethodQuery query) const |
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void | insertAction (QAction *before, QAction *action) |
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void | insertActions (QAction *before, QList< QAction * > actions) |
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bool | isActiveWindow () const |
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bool | isAncestorOf (const QWidget *child) const |
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bool | isEnabled () const |
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bool | isEnabledTo (const QWidget *parent) const |
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bool | isEnabledToTLW () const |
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bool | isFullScreen () const |
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bool | isHidden () const |
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bool | isMaximized () const |
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bool | isMinimized () const |
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bool | isModal () const |
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bool | isTopLevel () const |
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bool | isVisible () const |
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bool | isVisibleTo (const QWidget *parent) const |
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bool | isWindow () const |
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bool | isWindowModified () const |
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QLayout * | layout () const |
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Qt::LayoutDirection | layoutDirection () const |
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QLocale | locale () const |
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QPoint | mapFrom (const QWidget *parent, const QPoint &pos) const |
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QPoint | mapFromGlobal (const QPoint &pos) const |
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QPoint | mapFromParent (const QPoint &pos) const |
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QPoint | mapTo (const QWidget *parent, const QPoint &pos) const |
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QPoint | mapToGlobal (const QPoint &pos) const |
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QPoint | mapToParent (const QPoint &pos) const |
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QRegion | mask () const |
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int | maximumHeight () const |
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QSize | maximumSize () const |
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int | maximumWidth () const |
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int | minimumHeight () const |
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QSize | minimumSize () const |
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virtual QSize | minimumSizeHint () const |
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int | minimumWidth () const |
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void | move (const QPoint &point) |
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void | move (int x, int y) |
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QWidget * | nativeParentWidget () const |
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QWidget * | nextInFocusChain () const |
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QRect | normalGeometry () const |
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void | overrideWindowFlags (Qt::WindowFlags flags) |
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QPaintEngine * | paintEngine () const override |
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const QPalette & | palette () const |
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QWidget * | parentWidget () const |
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QPoint | pos () const |
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QWidget * | previousInFocusChain () const |
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QRect | rect () const |
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void | releaseKeyboard () |
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void | releaseMouse () |
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void | releaseShortcut (int id) |
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void | removeAction (QAction *action) |
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void | render (QPaintDevice *target, const QPoint &targetOffset=QPoint (), const QRegion &sourceRegion=QRegion (), RenderFlags renderFlags=RenderFlags (DrawWindowBackground|DrawChildren)) |
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void | render (QPainter *painter, const QPoint &targetOffset=QPoint (), const QRegion &sourceRegion=QRegion (), RenderFlags renderFlags=RenderFlags (DrawWindowBackground|DrawChildren)) |
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void | repaint (const QRect &rect) |
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void | repaint (const QRegion ®ion) |
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void | repaint (int x, int y, int w, int h) |
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void | resize (const QSize &size) |
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void | resize (int w, int h) |
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bool | restoreGeometry (const QByteArray &geometry) |
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QByteArray | saveGeometry () const |
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void | scroll (int dx, int dy) |
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void | scroll (int dx, int dy, const QRect &rect) |
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void | setAcceptDrops (bool on) |
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void | setAccessibleDescription (const QString &description) |
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void | setAccessibleName (const QString &name) |
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void | setAttribute (Qt::WidgetAttribute attribute, bool enable=true) |
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void | setAutoFillBackground (bool enable) |
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void | setBackgroundRole (QPalette::ColorRole role) |
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void | setBaseSize (const QSize &size) |
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void | setBaseSize (int basew, int baseh) |
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void | setContentsMargins (const QMargins &margins) |
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void | setContentsMargins (int left, int top, int right, int bottom) |
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void | setContextMenuPolicy (Qt::ContextMenuPolicy policy) |
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void | setCursor (const QCursor &cursor) |
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void | setEditFocus (bool enable) |
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void | setFixedHeight (int h) |
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void | setFixedSize (const QSize &size) |
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void | setFixedSize (int w, int h) |
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void | setFixedWidth (int w) |
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void | setFocus (Qt::FocusReason reason) |
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void | setFocusPolicy (Qt::FocusPolicy policy) |
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void | setFocusProxy (QWidget *widget) |
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void | setFont (const QFont &font) |
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void | setForegroundRole (QPalette::ColorRole role) |
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void | setGeometry (const QRect &rect) |
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void | setGeometry (int x, int y, int w, int h) |
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void | setGraphicsEffect (QGraphicsEffect *effect) |
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void | setInputMethodHints (Qt::InputMethodHints hints) |
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void | setLayout (QLayout *layout) |
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void | setLayoutDirection (Qt::LayoutDirection direction) |
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void | setLocale (const QLocale &locale) |
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void | setMask (const QBitmap &bitmap) |
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void | setMask (const QRegion ®ion) |
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void | setMaximumHeight (int maxh) |
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void | setMaximumSize (const QSize &size) |
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void | setMaximumSize (int maxw, int maxh) |
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void | setMaximumWidth (int maxw) |
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void | setMinimumHeight (int minh) |
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void | setMinimumSize (const QSize &size) |
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void | setMinimumSize (int minw, int minh) |
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void | setMinimumWidth (int minw) |
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void | setMouseTracking (bool enable) |
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void | setPalette (const QPalette &palette) |
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void | setParent (QWidget *parent) |
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void | setParent (QWidget *parent, Qt::WindowFlags flags) |
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void | setShortcutAutoRepeat (int id, bool enable=true) |
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void | setShortcutEnabled (int id, bool enable=true) |
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void | setSizeIncrement (const QSize &size) |
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void | setSizeIncrement (int w, int h) |
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void | setSizePolicy (QSizePolicy policy) |
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void | setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical) |
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void | setStatusTip (const QString &data) |
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void | setStyle (QStyle *style) |
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void | setToolTip (const QString &data) |
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void | setToolTipDuration (int msec) |
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void | setUpdatesEnabled (bool enable) |
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void | setWhatsThis (const QString &str) |
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void | setWindowFilePath (const QString &filePath) |
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void | setWindowFlags (Qt::WindowFlags flags) |
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void | setWindowIcon (const QIcon &icon) |
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void | setWindowModality (Qt::WindowModality windowModality) |
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void | setWindowOpacity (qreal level) |
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void | setWindowRole (const QString &role) |
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void | setWindowState (Qt::WindowStates windowState) |
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QSize | size () const |
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virtual QSize | sizeHint () const |
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QSize | sizeIncrement () const |
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QSizePolicy | sizePolicy () const |
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void | stackUnder (QWidget *widget) |
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QString | statusTip () const |
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QStyle * | style () const |
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QString | styleSheet () const |
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bool | testAttribute (Qt::WidgetAttribute attribute) const |
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QString | toolTip () const |
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int | toolTipDuration () const |
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QWidget * | topLevelWidget () const |
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bool | underMouse () const |
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void | ungrabGesture (Qt::GestureType gestureType) |
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void | unsetCursor () |
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void | unsetLayoutDirection () |
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void | unsetLocale () |
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void | update (const QRect &rect) |
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void | update (const QRegion ®ion) |
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void | update (int x, int y, int w, int h) |
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void | updateGeometry () |
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bool | updatesEnabled () const |
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QRegion | visibleRegion () const |
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QString | whatsThis () const |
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int | width () const |
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QWidget * | window () const |
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QString | windowFilePath () const |
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Qt::WindowFlags | windowFlags () const |
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QWindow * | windowHandle () const |
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QIcon | windowIcon () const |
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Qt::WindowModality | windowModality () const |
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qreal | windowOpacity () const |
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QString | windowRole () const |
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Qt::WindowStates | windowState () const |
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QString | windowTitle () const |
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Qt::WindowType | windowType () const |
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WId | winId () const |
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int | x () const |
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int | y () const |
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| QObject (QObject *parent=nullptr) |
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| ~QObject () |
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bool | blockSignals (bool block) |
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const QList< QObject * > & | children () const |
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bool | connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection) |
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bool | connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection) |
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bool | disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const |
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bool | disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const |
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bool | disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const |
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void | dumpObjectInfo () |
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void | dumpObjectTree () |
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QList< QString > | dynamicPropertyNames () const |
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virtual bool | event (QEvent *event) |
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virtual bool | eventFilter (QObject *watched, QEvent *event) |
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template<typename T > |
T | findChild (const QString &childName=QString ()) const |
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template<class T > |
QList< T > | findChildren (const QRegularExpression ®Exp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const |
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template<class T > |
QList< T > | findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const |
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bool | inherits (const QString &className) const |
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void | installEventFilter (QObject *filterObj) |
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bool | isWidgetType () const |
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bool | isWindowType () const |
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void | killTimer (int id) |
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const QMetaObject * | metaObject () const |
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void | moveToThread (QThread *targetThread) |
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QString | objectName () const |
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QObject * | parent () const |
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template<class T = QVariant> |
T | property (const QString &name) const |
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void | removeEventFilter (QObject *obj) |
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void | setObjectName (const QString &name) |
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void | setParent (QObject *parent) |
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bool | setProperty (const QString &name, const QVariant &value) |
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bool | signalsBlocked () const |
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int | startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer) |
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QThread * | thread () const |
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virtual | ~QPaintDevice () |
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int | colorCount () const |
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int | depth () const |
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int | devicePixelRatio () const |
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qreal | devicePixelRatioF () const |
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int | height () const |
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int | heightMM () const |
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int | logicalDpiX () const |
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int | logicalDpiY () const |
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bool | paintingActive () const |
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int | physicalDpiX () const |
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int | physicalDpiY () const |
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int | width () const |
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int | widthMM () const |
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using | RenderFlags = QFlags< RenderFlag > |
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enum | RenderFlag |
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enum | PaintDeviceMetric |
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static QWidget * | createWindowContainer (QWindow *window, QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag) |
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static QWidget * | find (WId id) |
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static QWidget * | keyboardGrabber () |
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static QWidget * | mouseGrabber () |
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static void | setTabOrder (QWidget *firstWidget, QWidget *secondWidget) |
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static bool | connect (const QObject *sender, const QMetaMethod &signalMethod, const QObject *receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection) |
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static bool | connect (const QObject *sender, const QString &signalMethod, const QObject *receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ()) |
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static bool | connect (const QObject *sender, const QString &signalMethod, const QString &location, const QObject *receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection) |
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template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn > |
static bool | connect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, SlotReturn (SlotClass::*slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection) |
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template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T > |
static bool | connect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection) |
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static bool | disconnect (const QObject *sender, const QMetaMethod &signalMethod, const QObject *receiver, const QMetaMethod &slotMethod) |
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static bool | disconnect (const QObject *sender, const QString &signalMethod, const QObject *receiver, const QString &slotMethod) |
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static bool | disconnect (const QObject *sender, const QString &signalMethod, const QString &location, const QObject *receiver, const QString &slotMethod) |
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static bool | disconnect (const QObject *sender, std::nullptr_t, const QObject *receiver, std::nullptr_t) |
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template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn > |
static bool | disconnect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, SlotReturn (SlotClass::*slotMethod)(SlotArgs...)) |
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template<class Sender , class SignalClass , class... SignalArgs, class Receiver > |
static bool | disconnect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr) |
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template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T > |
static bool | disconnect (const Sender *sender, void (SignalClass::*signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod) |
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static QMetaObject & | staticMetaObject () |
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static QString | tr (const char *text, const char *comment=nullptr, std::optional< int > numArg=std::optional< int >()) |
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void | updateMicroFocus () |
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| acceptDrops |
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| accessibleDescription |
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| accessibleName |
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| autoFillBackground |
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| baseSize |
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| childrenRect |
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| childrenRegion |
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| contextMenuPolicy |
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| cursor |
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| enabled |
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| focus |
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| focusPolicy |
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| font |
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| frameGeometry |
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| frameSize |
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| fullScreen |
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| geometry |
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| height |
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| inputMethodHints |
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| isActiveWindow |
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| layoutDirection |
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| locale |
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| maximized |
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| maximumHeight |
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| maximumSize |
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| maximumWidth |
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| minimized |
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| minimumHeight |
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| minimumSize |
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| minimumSizeHint |
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| minimumWidth |
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| modal |
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| mouseTracking |
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| normalGeometry |
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| palette |
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| pos |
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| rect |
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| size |
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| sizeHint |
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| sizeIncrement |
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| sizePolicy |
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| statusTip |
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| styleSheet |
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| toolTip |
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| updatesEnabled |
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| visible |
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| whatsThis |
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| width |
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| windowFilePath |
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| windowFlags |
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| windowIcon |
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| windowIconText |
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| windowModality |
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| windowModified |
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| windowOpacity |
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| windowTitle |
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| x |
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| y |
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| objectName |
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| QWidgetList |
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| WId |
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T | qobject_cast (QObject *object) |
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| QObjectList |
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The QSplashScreen widget provides a splash screen that can be shown during application startup.
A splash screen is a widget which is displayed when an application is being started. Splash screens are often used for applications where the start up times is a bit long. This provides the user with feedback to indicate the application is loading.
The splash screen appears in the center of the screen. It may be useful to add the Qt::WindowStaysOnTopHint to the splash widget's window flags if you want to keep it above all the other windows on the desktop. Some X11 window managers do not support the "stays on top" flag. A solution is to set up a timer which periodically calls raise() on the splash screen to simulate this effect.
The most common usage is to show a splash screen before the main widget is displayed. This is illustrated in the following code in which a splash screen is displayed and some initialization tasks are performed before the application's main window is shown.
int main(int argc, char *argv[])
{
splash.show();
app.processEvents();
return app.exec();
}
The user can hide the splash screen by clicking on it with the mouse. Since the splash screen is typically displayed before the event loop has started running, it is necessary to periodically call QApplication::processEvents() to receive the mouse clicks.
It is sometimes useful to update the splash screen with messages, for example, announcing connections established or modules loaded as the application starts up.
qApp->processEvents();
qApp->processEvents();
QSplashScreen supports this with the showMessage() function. If you wish to do your own drawing you can get a pointer to the pixmap used in the splash screen with pixmap(). Alternatively, you can subclass QSplashScreen and reimplement drawContents().
- See also
- showMessage()