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Qt 4.8
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Qt 4.8
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The QScrollArea class provides a scrolling view onto another widget. More...
#include <qscrollarea.h>
Public Functions | |
| Qt::Alignment | alignment () const |
| void | ensureVisible (int x, int y, int xmargin=50, int ymargin=50) |
| Scrolls the contents of the scroll area so that the point (x, y) is visible inside the region of the viewport with margins specified in pixels by xmargin and ymargin. More... | |
| void | ensureWidgetVisible (QWidget *childWidget, int xmargin=50, int ymargin=50) |
| Scrolls the contents of the scroll area so that the childWidget of QScrollArea::widget() is visible inside the viewport with margins specified in pixels by xmargin and ymargin. More... | |
| bool | focusNextPrevChild (bool next) |
| Reimplemented Function More... | |
| QScrollArea (QWidget *parent=0) | |
| Constructs an empty scroll area with the given parent. More... | |
| void | setAlignment (Qt::Alignment) |
| void | setWidget (QWidget *widget) |
| Sets the scroll area's widget. More... | |
| void | setWidgetResizable (bool resizable) |
| QSize | sizeHint () const |
| Reimplemented Function More... | |
| QWidget * | takeWidget () |
| Removes the scroll area's widget, and passes ownership of the widget to the caller. More... | |
| QWidget * | widget () const |
| Returns the scroll area's widget, or 0 if there is none. More... | |
| bool | widgetResizable () const |
| ~QScrollArea () | |
| Destroys the scroll area and its child widget. More... | |
 Public Functions inherited from QAbstractScrollArea | |
| void | addScrollBarWidget (QWidget *widget, Qt::Alignment alignment) |
| Adds widget as a scroll bar widget in the location specified by alignment. More... | |
| QWidget * | cornerWidget () const |
| Returns the widget in the corner between the two scroll bars. More... | |
| QScrollBar * | horizontalScrollBar () const |
| Returns the horizontal scroll bar. More... | |
| Qt::ScrollBarPolicy | horizontalScrollBarPolicy () const |
| QSize | maximumViewportSize () const |
| Returns the size of the viewport as if the scroll bars had no valid scrolling range. More... | |
| QSize | minimumSizeHint () const |
| Reimplemented Function More... | |
| QAbstractScrollArea (QWidget *parent=0) | |
| Constructs a viewport. More... | |
| QWidgetList | scrollBarWidgets (Qt::Alignment alignment) |
| Returns a list of the currently set scroll bar widgets. More... | |
| void | setCornerWidget (QWidget *widget) |
| Sets the widget in the corner between the two scroll bars to be widget. More... | |
| void | setHorizontalScrollBar (QScrollBar *scrollbar) |
| Replaces the existing horizontal scroll bar with scrollBar, and sets all the former scroll bar's slider properties on the new scroll bar. More... | |
| void | setHorizontalScrollBarPolicy (Qt::ScrollBarPolicy) |
| void | setVerticalScrollBar (QScrollBar *scrollbar) |
| Replaces the existing vertical scroll bar with scrollBar, and sets all the former scroll bar's slider properties on the new scroll bar. More... | |
| void | setVerticalScrollBarPolicy (Qt::ScrollBarPolicy) |
| void | setViewport (QWidget *widget) |
| Sets the viewport to be the given widget. More... | |
| QScrollBar * | verticalScrollBar () const |
| Returns the vertical scroll bar. More... | |
| Qt::ScrollBarPolicy | verticalScrollBarPolicy () const |
| QWidget * | viewport () const |
| Returns the viewport widget. More... | |
| ~QAbstractScrollArea () | |
| Destroys the viewport. More... | |
| Public Functions inherited from QFrame | |
| QRect | frameRect () const |
| Shadow | frameShadow () const |
| Shape | frameShape () const |
| int | frameStyle () const |
| Returns the frame style. More... | |
| int | frameWidth () const |
| int | lineWidth () const |
| int | midLineWidth () const |
| QFrame (QWidget *parent=0, Qt::WindowFlags f=0) | |
| Constructs a frame widget with frame style NoFrame and a 1-pixel frame width. More... | |
| void | setFrameRect (const QRect &) |
| em>Reimplemented Function More... | |
| void | setFrameShadow (Shadow) |
| void | setFrameShape (Shape) |
| void | setFrameStyle (int) |
| Sets the frame style to style. More... | |
| void | setLineWidth (int) |
| void | setMidLineWidth (int) |
| ~QFrame () | |
| Destroys the frame. More... | |
| Public Functions inherited from QWidget | |
| bool | acceptDrops () const |
| QString | accessibleDescription () const |
| QString | accessibleName () const |
| QList< QAction * > | actions () const |
| Returns the (possibly empty) list of this widget's actions. More... | |
| void | activateWindow () |
| Sets the top-level widget containing this widget to be the active window. More... | |
| void | addAction (QAction *action) |
| Appends the action action to this widget's list of actions. More... | |
| void | addActions (QList< QAction *> actions) |
| Appends the actions actions to this widget's list of actions. More... | |
| void | adjustSize () |
| Adjusts the size of the widget to fit its contents. More... | |
| bool | autoFillBackground () const |
| QPalette::ColorRole | backgroundRole () const |
| Returns the background role of the widget. More... | |
| QSize | baseSize () const |
| QWidget * | childAt (int x, int y) const |
| Returns the visible child widget at the position ({x}, {y}) in the widget's coordinate system. More... | |
| QWidget * | childAt (const QPoint &p) const |
| Returns the visible child widget at point p in the widget's own coordinate system. More... | |
| QRect | childrenRect () const |
| QRegion | childrenRegion () const |
| void | clearFocus () |
| Takes keyboard input focus from the widget. More... | |
| void | clearMask () |
| Removes any mask set by setMask(). More... | |
| QMargins | contentsMargins () const |
| The contentsMargins function returns the widget's contents margins. More... | |
| QRect | contentsRect () const |
| Returns the area inside the widget's margins. More... | |
| Qt::ContextMenuPolicy | contextMenuPolicy () const |
| void | createWinId () |
| QCursor | cursor () const |
| int | devType () const |
| WId | effectiveWinId () const |
| Returns the effective window system identifier of the widget, i. More... | |
| void | ensurePolished () const |
| Ensures that the widget has been polished by QStyle (i.e., has a proper font and palette). More... | |
| Qt::FocusPolicy | focusPolicy () const |
| QWidget * | focusProxy () const |
| Returns the focus proxy, or 0 if there is no focus proxy. More... | |
| QWidget * | focusWidget () const |
| Returns the last child of this widget that setFocus had been called on. More... | |
| const QFont & | font () const |
| QFontInfo | fontInfo () const |
| Returns the font info for the widget's current font. More... | |
| QFontMetrics | fontMetrics () const |
| Returns the font metrics for the widget's current font. More... | |
| QPalette::ColorRole | foregroundRole () const |
| Returns the foreground role. More... | |
| QRect | frameGeometry () const |
| QSize | frameSize () const |
| const QRect & | geometry () const |
| void | getContentsMargins (int *left, int *top, int *right, int *bottom) const |
| Returns the widget's contents margins for left, top, right, and bottom. More... | |
| HDC | getDC () const |
| Returns the window system handle of the widget, for low-level access. More... | |
| void | grabGesture (Qt::GestureType type, Qt::GestureFlags flags=Qt::GestureFlags()) |
| Subscribes the widget to a given gesture with specific flags. More... | |
| void | grabKeyboard () |
| Grabs the keyboard input. More... | |
| void | grabMouse () |
| Grabs the mouse input. More... | |
| void | grabMouse (const QCursor &) |
| int | grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut) |
| Adds a shortcut to Qt's shortcut system that watches for the given key sequence in the given context. More... | |
| QGraphicsEffect * | graphicsEffect () const |
| The graphicsEffect function returns a pointer to the widget's graphics effect. More... | |
| QGraphicsProxyWidget * | graphicsProxyWidget () const |
| Returns the proxy widget for the corresponding embedded widget in a graphics view; otherwise returns 0. More... | |
| bool | hasFocus () const |
| bool | hasMouseTracking () const |
| int | height () const |
| virtual int | heightForWidth (int) const |
| Returns the preferred height for this widget, given the width w. More... | |
| QInputContext * | inputContext () |
| This function returns the QInputContext for this widget. More... | |
| Qt::InputMethodHints | inputMethodHints () const |
| virtual QVariant | inputMethodQuery (Qt::InputMethodQuery) const |
| This method is only relevant for input widgets. More... | |
| void | insertAction (QAction *before, QAction *action) |
| Inserts the action action to this widget's list of actions, before the action before. More... | |
| void | insertActions (QAction *before, QList< QAction *> actions) |
| Inserts the actions actions to this widget's list of actions, before the action before. More... | |
| WId | internalWinId () const |
| Returns the window system identifier of the widget, or 0 if the widget is not created yet. More... | |
| bool | isActiveWindow () const |
| bool | isAncestorOf (const QWidget *child) const |
| Returns true if this widget is a parent, (or grandparent and so on to any level), of the given child, and both widgets are within the same window; otherwise returns false. More... | |
| bool | isEnabled () const |
| bool | isEnabledTo (QWidget *) const |
| Returns true if this widget would become enabled if ancestor is enabled; otherwise returns false. More... | |
| bool | isEnabledToTLW () const |
| This function is deprecated. More... | |
| bool | isFullScreen () const |
| bool | isHidden () const |
| Returns true if the widget is hidden, otherwise returns false. More... | |
| bool | isLeftToRight () const |
| bool | isMaximized () const |
| bool | isMinimized () const |
| bool | isModal () const |
| bool | isRightToLeft () const |
| bool | isTopLevel () const |
| Use isWindow() instead. More... | |
| bool | isVisible () const |
| bool | isVisibleTo (QWidget *) const |
| Returns true if this widget would become visible if ancestor is shown; otherwise returns false. More... | |
| bool | isWindow () const |
| Returns true if the widget is an independent window, otherwise returns false. More... | |
| bool | isWindowModified () const |
| QLayout * | layout () const |
| Returns the layout manager that is installed on this widget, or 0 if no layout manager is installed. More... | |
| Qt::LayoutDirection | layoutDirection () const |
| QLocale | locale () const |
| Qt::HANDLE | macCGHandle () const |
| Returns the CoreGraphics handle of the widget. More... | |
| Qt::HANDLE | macQDHandle () const |
| Returns the QuickDraw handle of the widget. More... | |
| QPoint | mapFrom (QWidget *, const QPoint &) const |
| Translates the widget coordinate pos from the coordinate system of parent to this widget's coordinate system. More... | |
| QPoint | mapFromGlobal (const QPoint &) const |
| Translates the global screen coordinate pos to widget coordinates. More... | |
| QPoint | mapFromParent (const QPoint &) const |
| Translates the parent widget coordinate pos to widget coordinates. More... | |
| QPoint | mapTo (QWidget *, const QPoint &) const |
| Translates the widget coordinate pos to the coordinate system of parent. More... | |
| QPoint | mapToGlobal (const QPoint &) const |
| Translates the widget coordinate pos to global screen coordinates. More... | |
| QPoint | mapToParent (const QPoint &) const |
| Translates the widget coordinate pos to a coordinate in the parent widget. More... | |
| QRegion | mask () const |
| Returns the mask currently set on a widget. More... | |
| int | maximumHeight () const |
| QSize | maximumSize () const |
| int | maximumWidth () const |
| int | minimumHeight () const |
| QSize | minimumSize () const |
| int | minimumWidth () const |
| void | move (int x, int y) |
| This corresponds to move(QPoint(x, y)). More... | |
| void | move (const QPoint &) |
| QWidget * | nativeParentWidget () const |
| Returns the native parent for this widget, i. More... | |
| QWidget * | nextInFocusChain () const |
| Returns the next widget in this widget's focus chain. More... | |
| QRect | normalGeometry () const |
| void | overrideWindowFlags (Qt::WindowFlags type) |
| Sets the window flags for the widget to flags, without telling the window system. More... | |
| void | overrideWindowState (Qt::WindowStates state) |
| QPaintEngine * | paintEngine () const |
| Returns the widget's paint engine. More... | |
| const QPalette & | palette () const |
| QWidget * | parentWidget () const |
| Returns the parent of this widget, or 0 if it does not have any parent widget. More... | |
| QPoint | pos () const |
| QWidget * | previousInFocusChain () const |
| The previousInFocusChain function returns the previous widget in this widget's focus chain. More... | |
| QWidget (QWidget *parent=0, Qt::WindowFlags f=0) | |
| Constructs a widget which is a child of parent, with widget flags set to f. More... | |
| QRect | rect () const |
| void | releaseDC (HDC) const |
| Releases the HDC hdc acquired by a previous call to getDC(). More... | |
| void | releaseKeyboard () |
| Releases the keyboard grab. More... | |
| void | releaseMouse () |
| Releases the mouse grab. More... | |
| void | releaseShortcut (int id) |
| Removes the shortcut with the given id from Qt's shortcut system. More... | |
| void | removeAction (QAction *action) |
| Removes the action action from this widget's list of actions. More... | |
| void | render (QPaintDevice *target, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground|DrawChildren)) |
| Renders the sourceRegion of this widget into the target using renderFlags to determine how to render. More... | |
| void | render (QPainter *painter, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground|DrawChildren)) |
| Renders the widget into the painter's QPainter::device(). More... | |
| void | repaint (int x, int y, int w, int h) |
| This version repaints a rectangle (x, y, w, h) inside the widget. More... | |
| void | repaint (const QRect &) |
| This version repaints a rectangle rect inside the widget. More... | |
| void | repaint (const QRegion &) |
| This version repaints a region rgn inside the widget. More... | |
| void | resize (int w, int h) |
| This corresponds to resize(QSize(w, h)). More... | |
| void | resize (const QSize &) |
| bool | restoreGeometry (const QByteArray &geometry) |
| Restores the geometry and state top-level widgets stored in the byte array geometry. More... | |
| QByteArray | saveGeometry () const |
| Saves the current geometry and state for top-level widgets. More... | |
| void | scroll (int dx, int dy) |
| Scrolls the widget including its children dx pixels to the right and dy downward. More... | |
| void | scroll (int dx, int dy, const QRect &) |
| This version only scrolls r and does not move the children of the widget. More... | |
| void | setAcceptDrops (bool on) |
| void | setAccessibleDescription (const QString &description) |
| void | setAccessibleName (const QString &name) |
| void | setAttribute (Qt::WidgetAttribute, bool on=true) |
| Sets the attribute attribute on this widget if on is true; otherwise clears the attribute. More... | |
| void | setAutoFillBackground (bool enabled) |
| void | setBackgroundRole (QPalette::ColorRole) |
| Sets the background role of the widget to role. More... | |
| void | setBaseSize (const QSize &) |
| void | setBaseSize (int basew, int baseh) |
| This corresponds to setBaseSize(QSize(basew, baseh)). More... | |
| void | setContentsMargins (int left, int top, int right, int bottom) |
| Sets the margins around the contents of the widget to have the sizes left, top, right, and bottom. More... | |
| void | setContentsMargins (const QMargins &margins) |
| The setContentsMargins function sets the margins around the widget's contents. More... | |
| void | setContextMenuPolicy (Qt::ContextMenuPolicy policy) |
| void | setCursor (const QCursor &) |
| void | setFixedHeight (int h) |
| Sets both the minimum and maximum heights of the widget to h without changing the widths. More... | |
| void | setFixedSize (const QSize &) |
| Sets both the minimum and maximum sizes of the widget to s, thereby preventing it from ever growing or shrinking. More... | |
| void | setFixedSize (int w, int h) |
| Sets the width of the widget to w and the height to h. More... | |
| void | setFixedWidth (int w) |
| Sets both the minimum and maximum width of the widget to w without changing the heights. More... | |
| void | setFocus (Qt::FocusReason reason) |
| Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the active window. More... | |
| void | setFocusPolicy (Qt::FocusPolicy policy) |
| void | setFocusProxy (QWidget *) |
| Sets the widget's focus proxy to widget w. More... | |
| void | setFont (const QFont &) |
| Use the single-argument overload instead. More... | |
| void | setForegroundRole (QPalette::ColorRole) |
| Sets the foreground role of the widget to role. More... | |
| void | setGeometry (int x, int y, int w, int h) |
| This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to setGeometry(QRect(x, y, w, h)). More... | |
| void | setGeometry (const QRect &) |
| void | setGraphicsEffect (QGraphicsEffect *effect) |
| The setGraphicsEffect function is for setting the widget's graphics effect. More... | |
| void | setInputContext (QInputContext *) |
| This function sets the input context context on this widget. More... | |
| void | setInputMethodHints (Qt::InputMethodHints hints) |
| void | setLayout (QLayout *) |
| Sets the layout manager for this widget to layout. More... | |
| void | setLayoutDirection (Qt::LayoutDirection direction) |
| void | setLocale (const QLocale &locale) |
| void | setMask (const QBitmap &) |
| Causes only the pixels of the widget for which bitmap has a corresponding 1 bit to be visible. More... | |
| void | setMask (const QRegion &) |
| Causes only the parts of the widget which overlap region to be visible. More... | |
| void | setMaximumHeight (int maxh) |
| void | setMaximumSize (const QSize &) |
| void | setMaximumSize (int maxw, int maxh) |
| This function corresponds to setMaximumSize(QSize(maxw, maxh)). More... | |
| void | setMaximumWidth (int maxw) |
| void | setMinimumHeight (int minh) |
| void | setMinimumSize (const QSize &) |
| void | setMinimumSize (int minw, int minh) |
| This function corresponds to setMinimumSize(QSize(minw, minh)). More... | |
| void | setMinimumWidth (int minw) |
| void | setMouseTracking (bool enable) |
| void | setPalette (const QPalette &) |
| Use the single-argument overload instead. More... | |
| void | setParent (QWidget *parent) |
| Sets the parent of the widget to parent, and resets the window flags. More... | |
| void | setParent (QWidget *parent, Qt::WindowFlags f) |
| This function also takes widget flags, f as an argument. More... | |
| void | setShortcutAutoRepeat (int id, bool enable=true) |
| If enable is true, auto repeat of the shortcut with the given id is enabled; otherwise it is disabled. More... | |
| void | setShortcutEnabled (int id, bool enable=true) |
| If enable is true, the shortcut with the given id is enabled; otherwise the shortcut is disabled. More... | |
| void | setSizeIncrement (const QSize &) |
| void | setSizeIncrement (int w, int h) |
| Sets the x (width) size increment to w and the y (height) size increment to h. More... | |
| void | setSizePolicy (QSizePolicy) |
| void | setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical) |
| Sets the size policy of the widget to horizontal and vertical, with standard stretch and no height-for-width. More... | |
| void | setStatusTip (const QString &) |
| void | setStyle (QStyle *) |
| Sets the widget's GUI style to style. More... | |
| void | setToolTip (const QString &) |
| void | setUpdatesEnabled (bool enable) |
| void | setupUi (QWidget *widget) |
| Sets up the user interface for the specified widget. More... | |
| void | setWhatsThis (const QString &) |
| void | setWindowFilePath (const QString &filePath) |
| void | setWindowFlags (Qt::WindowFlags type) |
| void | setWindowIcon (const QIcon &icon) |
| void | setWindowIconText (const QString &) |
| void | setWindowModality (Qt::WindowModality windowModality) |
| void | setWindowOpacity (qreal level) |
| void | setWindowRole (const QString &) |
| Sets the window's role to role. More... | |
| void | setWindowState (Qt::WindowStates state) |
| Sets the window state to windowState. More... | |
| void | setWindowSurface (QWindowSurface *surface) |
| Sets the window surface to be the surface specified. More... | |
| QSize | size () const |
| QSize | sizeIncrement () const |
| QSizePolicy | sizePolicy () const |
| void | stackUnder (QWidget *) |
| Places the widget under w in the parent widget's stack. More... | |
| QString | statusTip () const |
| QStyle * | style () const |
| QString | styleSheet () const |
| bool | testAttribute (Qt::WidgetAttribute) const |
| Returns true if attribute attribute is set on this widget; otherwise returns false. More... | |
| QString | toolTip () const |
| QWidget * | topLevelWidget () const |
| bool | underMouse () const |
| Returns true if the widget is under the mouse cursor; otherwise returns false. More... | |
| void | ungrabGesture (Qt::GestureType type) |
| Unsubscribes the widget from a given gesture type. More... | |
| void | unsetCursor () |
| void | unsetLayoutDirection () |
| void | unsetLocale () |
| void | update (int x, int y, int w, int h) |
| This version updates a rectangle (x, y, w, h) inside the widget. More... | |
| void | update (const QRect &) |
| This version updates a rectangle rect inside the widget. More... | |
| void | update (const QRegion &) |
| This version repaints a region rgn inside the widget. More... | |
| void | updateGeometry () |
| Notifies the layout system that this widget has changed and may need to change geometry. More... | |
| bool | updatesEnabled () const |
| QRegion | visibleRegion () const |
| Returns the unobscured region where paint events can occur. More... | |
| QString | whatsThis () const |
| int | width () const |
| QWidget * | window () const |
| Returns the window for this widget, i.e. More... | |
| QString | windowFilePath () const |
| Qt::WindowFlags | windowFlags () const |
| Window flags are a combination of a type (e. More... | |
| QIcon | windowIcon () const |
| QString | windowIconText () const |
| Qt::WindowModality | windowModality () const |
| qreal | windowOpacity () const |
| QString | windowRole () const |
| Returns the window's role, or an empty string. More... | |
| Qt::WindowStates | windowState () const |
| Returns the current window state. More... | |
| QWindowSurface * | windowSurface () const |
| Returns the QWindowSurface this widget will be drawn into. More... | |
| QString | windowTitle () const |
| Qt::WindowType | windowType () const |
| Returns the window type of this widget. More... | |
| WId | winId () const |
| Returns the window system identifier of the widget. More... | |
| int | x () const |
| const QX11Info & | x11Info () const |
| Returns information about the configuration of the X display used to display the widget. More... | |
| Qt::HANDLE | x11PictureHandle () const |
| Returns the X11 Picture handle of the widget for XRender support. More... | |
| int | y () const |
| ~QWidget () | |
| Destroys the widget. More... | |
| Public Functions inherited from QObject | |
| bool | blockSignals (bool b) |
| If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More... | |
| const QObjectList & | children () const |
| Returns a list of child objects. More... | |
| bool | connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const |
| bool | disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0) |
| bool | disconnect (const QObject *receiver, const char *member=0) |
| void | dumpObjectInfo () |
| Dumps information about signal connections, etc. More... | |
| void | dumpObjectTree () |
| Dumps a tree of children to the debug output. More... | |
| QList< QByteArray > | dynamicPropertyNames () const |
| Returns the names of all properties that were dynamically added to the object using setProperty(). More... | |
| template<typename T > | |
| T | findChild (const QString &aName=QString()) const |
| Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More... | |
| template<typename T > | |
| QList< T > | findChildren (const QString &aName=QString()) const |
| Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More... | |
| template<typename T > | |
| QList< T > | findChildren (const QRegExp &re) const |
| bool | inherits (const char *classname) const |
| Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More... | |
| void | installEventFilter (QObject *) |
| Installs an event filter filterObj on this object. More... | |
| bool | isWidgetType () const |
| Returns true if the object is a widget; otherwise returns false. More... | |
| void | killTimer (int id) |
| Kills the timer with timer identifier, id. More... | |
| virtual const QMetaObject * | metaObject () const |
| Returns a pointer to the meta-object of this object. More... | |
| void | moveToThread (QThread *thread) |
| Changes the thread affinity for this object and its children. More... | |
| QString | objectName () const |
| QObject * | parent () const |
| Returns a pointer to the parent object. More... | |
| QVariant | property (const char *name) const |
| Returns the value of the object's name property. More... | |
| Q_INVOKABLE | QObject (QObject *parent=0) |
| Constructs an object with parent object parent. More... | |
| void | removeEventFilter (QObject *) |
| Removes an event filter object obj from this object. More... | |
| void | setObjectName (const QString &name) |
| void | setParent (QObject *) |
| Makes the object a child of parent. More... | |
| bool | setProperty (const char *name, const QVariant &value) |
| Sets the value of the object's name property to value. More... | |
| void | setUserData (uint id, QObjectUserData *data) |
| bool | signalsBlocked () const |
| Returns true if signals are blocked; otherwise returns false. More... | |
| int | startTimer (int interval) |
| Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More... | |
| QThread * | thread () const |
| Returns the thread in which the object lives. More... | |
| QObjectUserData * | userData (uint id) const |
| virtual | ~QObject () |
| Destroys the object, deleting all its child objects. More... | |
| Public Functions inherited from QPaintDevice | |
| int | colorCount () const |
| int | depth () const |
| int | height () const |
| int | heightMM () const |
| int | logicalDpiX () const |
| int | logicalDpiY () const |
| QT_DEPRECATED int | numColors () const |
| bool | paintingActive () const |
| int | physicalDpiX () const |
| int | physicalDpiY () const |
| int | width () const |
| int | widthMM () const |
| virtual | ~QPaintDevice () |
Protected Functions | |
| bool | event (QEvent *) |
| Reimplemented Function More... | |
| bool | eventFilter (QObject *, QEvent *) |
| Reimplemented Function More... | |
| QScrollArea (QScrollAreaPrivate &dd, QWidget *parent=0) | |
| void | resizeEvent (QResizeEvent *) |
| Reimplemented Function More... | |
| void | scrollContentsBy (int dx, int dy) |
| This virtual handler is called when the scroll bars are moved by dx, dy, and consequently the viewport's contents should be scrolled accordingly. More... | |
| Protected Functions inherited from QAbstractScrollArea | |
| void | contextMenuEvent (QContextMenuEvent *) |
| This event handler can be reimplemented in a subclass to receive context menu events for the viewport() widget. More... | |
| void | dragEnterEvent (QDragEnterEvent *) |
| This event handler can be reimplemented in a subclass to receive drag enter events (passed in event), for the viewport() widget. More... | |
| void | dragLeaveEvent (QDragLeaveEvent *) |
| This event handler can be reimplemented in a subclass to receive drag leave events (passed in event), for the viewport() widget. More... | |
| void | dragMoveEvent (QDragMoveEvent *) |
| This event handler can be reimplemented in a subclass to receive drag move events (passed in event), for the viewport() widget. More... | |
| void | dropEvent (QDropEvent *) |
| This event handler can be reimplemented in a subclass to receive drop events (passed in event), for the viewport() widget. More... | |
| void | keyPressEvent (QKeyEvent *) |
| This function is called with key event e when key presses occur. More... | |
| void | mouseDoubleClickEvent (QMouseEvent *) |
| This event handler can be reimplemented in a subclass to receive mouse double click events for the viewport() widget. More... | |
| void | mouseMoveEvent (QMouseEvent *) |
| This event handler can be reimplemented in a subclass to receive mouse move events for the viewport() widget. More... | |
| void | mousePressEvent (QMouseEvent *) |
| This event handler can be reimplemented in a subclass to receive mouse press events for the viewport() widget. More... | |
| void | mouseReleaseEvent (QMouseEvent *) |
| This event handler can be reimplemented in a subclass to receive mouse release events for the viewport() widget. More... | |
| void | paintEvent (QPaintEvent *) |
| This event handler can be reimplemented in a subclass to receive paint events (passed in event), for the viewport() widget. More... | |
| QAbstractScrollArea (QAbstractScrollAreaPrivate &dd, QWidget *parent=0) | |
| Creates a new QAbstractScrollAreaPrivate, dd with the given parent. More... | |
| void | setViewportMargins (int left, int top, int right, int bottom) |
| Sets the margins around the scrolling area to left, top, right and bottom. More... | |
| void | setViewportMargins (const QMargins &margins) |
| Sets margins around the scrolling area. More... | |
| virtual bool | viewportEvent (QEvent *) |
| The main event handler for the scrolling area (the viewport() widget). More... | |
| void | wheelEvent (QWheelEvent *) |
| This event handler can be reimplemented in a subclass to receive wheel events for the viewport() widget. More... | |
| Protected Functions inherited from QFrame | |
| void | changeEvent (QEvent *) |
| This event handler can be reimplemented to handle state changes. More... | |
| void | drawFrame (QPainter *) |
| em>Reimplemented Function More... | |
| void | paintEvent (QPaintEvent *) |
| This event handler can be reimplemented in a subclass to receive paint events passed in event. More... | |
| QFrame (QFramePrivate &dd, QWidget *parent=0, Qt::WindowFlags f=0) | |
| Protected Functions inherited from QWidget | |
| virtual void | actionEvent (QActionEvent *) |
| This event handler is called with the given event whenever the widget's actions are changed. More... | |
| virtual void | closeEvent (QCloseEvent *) |
| This event handler is called with the given event when Qt receives a window close request for a top-level widget from the window system. More... | |
| void | create (WId=0, bool initializeWindow=true, bool destroyOldWindow=true) |
| Creates a new widget window if window is 0, otherwise sets the widget's window to window. More... | |
| void | destroy (bool destroyWindow=true, bool destroySubWindows=true) |
| Frees up window system resources. More... | |
| virtual void | enabledChange (bool) |
| virtual void | enterEvent (QEvent *) |
| This event handler can be reimplemented in a subclass to receive widget enter events which are passed in the event parameter. More... | |
| virtual void | focusInEvent (QFocusEvent *) |
| This event handler can be reimplemented in a subclass to receive keyboard focus events (focus received) for the widget. More... | |
| bool | focusNextChild () |
| Finds a new widget to give the keyboard focus to, as appropriate for Tab, and returns true if it can find a new widget, or false if it can't. More... | |
| virtual void | focusOutEvent (QFocusEvent *) |
| This event handler can be reimplemented in a subclass to receive keyboard focus events (focus lost) for the widget. More... | |
| bool | focusPreviousChild () |
| Finds a new widget to give the keyboard focus to, as appropriate for Shift+Tab, and returns true if it can find a new widget, or false if it can't. More... | |
| virtual void | fontChange (const QFont &) |
| virtual void | hideEvent (QHideEvent *) |
| This event handler can be reimplemented in a subclass to receive widget hide events. More... | |
| virtual void | inputMethodEvent (QInputMethodEvent *) |
| This event handler, for event event, can be reimplemented in a subclass to receive Input Method composition events. More... | |
| virtual void | keyReleaseEvent (QKeyEvent *) |
| This event handler, for event event, can be reimplemented in a subclass to receive key release events for the widget. More... | |
| virtual void | languageChange () |
| virtual void | leaveEvent (QEvent *) |
| This event handler can be reimplemented in a subclass to receive widget leave events which are passed in the event parameter. More... | |
| virtual bool | macEvent (EventHandlerCallRef, EventRef) |
| This special event handler can be reimplemented in a subclass to receive native Macintosh events. More... | |
| int | metric (PaintDeviceMetric) const |
| Internal implementation of the virtual QPaintDevice::metric() function. More... | |
| virtual void | moveEvent (QMoveEvent *) |
| This event handler can be reimplemented in a subclass to receive widget move events which are passed in the event parameter. More... | |
| virtual void | paletteChange (const QPalette &) |
| QWidget (QWidgetPrivate &d, QWidget *parent, Qt::WindowFlags f) | |
| virtual bool | qwsEvent (QWSEvent *) |
| This special event handler can be reimplemented in a subclass to receive native Qt for Embedded Linux events which are passed in the event parameter. More... | |
| void | resetInputContext () |
| This function can be called on the widget that currently has focus to reset the input method operating on it. More... | |
| virtual void | showEvent (QShowEvent *) |
| This event handler can be reimplemented in a subclass to receive widget show events which are passed in the event parameter. More... | |
| virtual void | styleChange (QStyle &) |
| virtual void | tabletEvent (QTabletEvent *) |
| This event handler, for event event, can be reimplemented in a subclass to receive tablet events for the widget. More... | |
| virtual void | windowActivationChange (bool) |
| virtual bool | winEvent (MSG *message, long *result) |
| This special event handler can be reimplemented in a subclass to receive native Windows events which are passed in the message parameter. More... | |
| virtual bool | x11Event (XEvent *) |
| This special event handler can be reimplemented in a subclass to receive native X11 events passed in the event parameter. More... | |
| Protected Functions inherited from QObject | |
| virtual void | childEvent (QChildEvent *) |
| This event handler can be reimplemented in a subclass to receive child events. More... | |
| virtual void | connectNotify (const char *signal) |
| This virtual function is called when something has been connected to signal in this object. More... | |
| virtual void | customEvent (QEvent *) |
| This event handler can be reimplemented in a subclass to receive custom events. More... | |
| virtual void | disconnectNotify (const char *signal) |
| This virtual function is called when something has been disconnected from signal in this object. More... | |
| QObject (QObjectPrivate &dd, QObject *parent=0) | |
| int | receivers (const char *signal) const |
| Returns the number of receivers connected to the signal. More... | |
| QObject * | sender () const |
| Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More... | |
| int | senderSignalIndex () const |
| virtual void | timerEvent (QTimerEvent *) |
| This event handler can be reimplemented in a subclass to receive timer events for the object. More... | |
| Protected Functions inherited from QPaintDevice | |
| QPaintDevice () | |
Properties | |
| Qt::Alignment | alignment |
| the alignment of the scroll area's widget More... | |
| bool | widgetResizable |
| whether the scroll area should resize the view widget More... | |
Additional Inherited Members | |
| Public Types inherited from QFrame | |
| enum | Shadow { Plain = 0x0010, Raised = 0x0020, Sunken = 0x0030 } |
| This enum type defines the types of shadow that are used to give a 3D effect to frames. More... | |
| enum | Shape { NoFrame = 0, Box = 0x0001, Panel = 0x0002, WinPanel = 0x0003, HLine = 0x0004, VLine = 0x0005, StyledPanel = 0x0006 } |
| This enum type defines the shapes of frame available. More... | |
| enum | StyleMask { Shadow_Mask = 0x00f0, Shape_Mask = 0x000f } |
| This enum defines two constants that can be used to extract the two components of frameStyle(): More... | |
| Public Types inherited from QWidget | |
| enum | RenderFlag { DrawWindowBackground = 0x1, DrawChildren = 0x2, IgnoreMask = 0x4 } |
| This enum describes how to render the widget when calling QWidget::render(). More... | |
| Public Types inherited from QPaintDevice | |
| enum | PaintDeviceMetric { PdmWidth = 1, PdmHeight, PdmWidthMM, PdmHeightMM, PdmNumColors, PdmDepth, PdmDpiX, PdmDpiY, PdmPhysicalDpiX, PdmPhysicalDpiY } |
| Public Slots inherited from QWidget | |
| bool | close () |
| Closes this widget. More... | |
| void | hide () |
| Hides the widget. More... | |
| void | lower () |
| Lowers the widget to the bottom of the parent widget's stack. More... | |
| void | raise () |
| Raises this widget to the top of the parent widget's stack. More... | |
| void | repaint () |
| Repaints the widget directly by calling paintEvent() immediately, unless updates are disabled or the widget is hidden. More... | |
| void | setDisabled (bool) |
| Disables widget input events if disable is true; otherwise enables input events. More... | |
| void | setEnabled (bool) |
| void | setFocus () |
| Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the active window. More... | |
| void | setHidden (bool hidden) |
| Convenience function, equivalent to setVisible(!hidden). More... | |
| QT_MOC_COMPAT void | setShown (bool shown) |
| Use setVisible(shown) instead. More... | |
| void | setStyleSheet (const QString &styleSheet) |
| virtual void | setVisible (bool visible) |
| void | setWindowModified (bool) |
| void | setWindowTitle (const QString &) |
| void | show () |
| Shows the widget and its child widgets. More... | |
| void | showFullScreen () |
| Shows the widget in full-screen mode. More... | |
| void | showMaximized () |
| Shows the widget maximized. More... | |
| void | showMinimized () |
| Shows the widget minimized, as an icon. More... | |
| void | showNormal () |
| Restores the widget after it has been maximized or minimized. More... | |
| void | update () |
| Updates the widget unless updates are disabled or the widget is hidden. More... | |
| Public Slots inherited from QObject | |
| void | deleteLater () |
| Schedules this object for deletion. More... | |
| Signals inherited from QWidget | |
| void | customContextMenuRequested (const QPoint &pos) |
| This signal is emitted when the widget's contextMenuPolicy is Qt::CustomContextMenu, and the user has requested a context menu on the widget. More... | |
| Signals inherited from QObject | |
| void | destroyed (QObject *=0) |
| This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More... | |
| Static Public Functions inherited from QWidget | |
| static QWidget * | find (WId) |
| Returns a pointer to the widget with window identifer/handle id. More... | |
| static QWidget * | keyboardGrabber () |
| Returns the widget that is currently grabbing the keyboard input. More... | |
| static QWidget * | mouseGrabber () |
| Returns the widget that is currently grabbing the mouse input. More... | |
| static void | setTabOrder (QWidget *, QWidget *) |
| Puts the second widget after the first widget in the focus order. More... | |
| Static Public Functions inherited from QObject | |
| static bool | connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection) |
| Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More... | |
| static bool | connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection) |
| static bool | disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member) |
| Disconnects signal in object sender from method in object receiver. More... | |
| static bool | disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member) |
| static uint | registerUserData () |
| static QString | tr (const char *sourceText, const char *comment=0, int n=-1) |
| static QString | trUtf8 (const char *sourceText, const char *comment=0, int n=-1) |
| Static Public Functions inherited from QPaintDevice | |
| static QWSDisplay * | qwsDisplay () |
| Static Public Variables inherited from QObject | |
| static const QMetaObject | staticMetaObject |
| This variable stores the meta-object for the class. More... | |
| Protected Slots inherited from QAbstractScrollArea | |
| void | setupViewport (QWidget *viewport) |
| This slot is called by QAbstractScrollArea after setViewport(viewport) has been called. More... | |
| Protected Slots inherited from QWidget | |
| void | updateMicroFocus () |
| Updates the widget's micro focus. More... | |
| Protected Variables inherited from QObject | |
| QScopedPointer< QObjectData > | d_ptr |
| Protected Variables inherited from QPaintDevice | |
| ushort | painters |
| Static Protected Variables inherited from QObject | |
| static const QMetaObject | staticQtMetaObject |
| Related Functions inherited from QWidget | |
| QWidgetList | |
| WId | |
| Platform dependent window identifier. More... | |
| Related Functions inherited from QObject | |
| T | qFindChildqFindChildren (const QObject *obj, const QString &name)() |
| QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QString &name)() |
| QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QRegExp ®Exp)() |
| T * | qobject_cast (QObject *object) |
| QObjectList | |
| void * | qt_find_obj_child (QObject *parent, const char *type, const QString &name) |
| Returns a pointer to the object named name that inherits type and with a given parent. More... | |
| Related Functions inherited from QPaintDevice | |
| const Q_GUI_EXPORT QX11Info * | qt_x11Info (const QPaintDevice *pd) |
| Returns the QX11Info structure for the pd paint device. More... | |
The QScrollArea class provides a scrolling view onto another widget.
A scroll area is used to display the contents of a child widget within a frame. If the widget exceeds the size of the frame, the view can provide scroll bars so that the entire area of the child widget can be viewed. The child widget must be specified with setWidget(). For example:
The code above creates a scroll area (shown in the images below) containing an image label. When scaling the image, the scroll area can provide the necessary scroll bars:
| 
| 
|
The scroll bars appearance depends on the currently set Qt::ScrollBarPolicy . You can control the appearance of the scroll bars using the inherited functionality from QAbstractScrollArea.
For example, you can set the QAbstractScrollArea::horizontalScrollBarPolicy and QAbstractScrollArea::verticalScrollBarPolicy properties. Or if you want the scroll bars to adjust dynamically when the contents of the scroll area changes, you can use the QAbstractScrollArea::horizontalScrollBar() and QAbstractScrollArea::verticalScrollBar() functions (which enable you to access the scroll bars) and set the scroll bars' values whenever the scroll area's contents change, using the QScrollBar::setValue() function.
You can retrieve the child widget using the widget() function. The view can be made to be resizable with the setWidgetResizable() function. The alignment of the widget can be specified with setAlignment().
Two convenience functions ensureVisible() and ensureWidgetVisible() ensure a certain region of the contents is visible inside the viewport, by scrolling the contents if necessary.
When using a scroll area to display the contents of a custom widget, it is important to ensure that the size hint of the child widget is set to a suitable value. If a standard QWidget is used for the child widget, it may be necessary to call QWidget::setMinimumSize() to ensure that the contents of the widget are shown correctly within the scroll area.
If a scroll area is used to display the contents of a widget that contains child widgets arranged in a layout, it is important to realize that the size policy of the layout will also determine the size of the widget. This is especially useful to know if you intend to dynamically change the contents of the layout. In such cases, setting the layout's size constraint property to one which provides constraints on the minimum and/or maximum size of the layout (e.g., QLayout::SetMinAndMaxSize) will cause the size of the scroll area to be updated whenever the contents of the layout changes.
For a complete example using the QScrollArea class, see the Image Viewer example. The example shows how to combine QLabel and QScrollArea to display an image.
Definition at line 57 of file qscrollarea.h.
|
explicit |
Constructs an empty scroll area with the given parent.
Definition at line 145 of file qscrollarea.cpp.
| QScrollArea::~QScrollArea | ( | ) |
Destroys the scroll area and its child widget.
Definition at line 173 of file qscrollarea.cpp.
|
protected |
Definition at line 158 of file qscrollarea.cpp.
| Qt::Alignment QScrollArea::alignment | ( | ) | const |
Referenced by setAlignment(), and QScrollAreaPrivate::updateWidgetPosition().
| void QScrollArea::ensureVisible | ( | int | x, |
| int | y, | ||
| int | xmargin = 50, |
||
| int | ymargin = 50 |
||
| ) |
Scrolls the contents of the scroll area so that the point (x, y) is visible inside the region of the viewport with margins specified in pixels by xmargin and ymargin.
If the specified point cannot be reached, the contents are scrolled to the nearest valid position. The default value for both margins is 50 pixels.
Definition at line 433 of file qscrollarea.cpp.
| void QScrollArea::ensureWidgetVisible | ( | QWidget * | childWidget, |
| int | xmargin = 50, |
||
| int | ymargin = 50 |
||
| ) |
Scrolls the contents of the scroll area so that the childWidget of QScrollArea::widget() is visible inside the viewport with margins specified in pixels by xmargin and ymargin.
If the specified point cannot be reached, the contents are scrolled to the nearest valid position. The default value for both margins is 50 pixels.
Definition at line 466 of file qscrollarea.cpp.
Referenced by eventFilter(), and focusNextPrevChild().
|
protectedvirtual |
Reimplemented Function
Reimplemented from QAbstractScrollArea.
Definition at line 299 of file qscrollarea.cpp.
Reimplemented Function
Reimplemented from QObject.
Definition at line 320 of file qscrollarea.cpp.
|
virtual |
Reimplemented Function
Reimplemented from QWidget.
Definition at line 417 of file qscrollarea.cpp.
|
protectedvirtual |
Reimplemented Function
em>Reimplemented Function
Reimplemented from QAbstractScrollArea.
Definition at line 339 of file qscrollarea.cpp.
|
protectedvirtual |
This virtual handler is called when the scroll bars are moved by dx, dy, and consequently the viewport's contents should be scrolled accordingly.
The default implementation simply calls update() on the entire viewport(), subclasses can reimplement this handler for optimization purposes, or - like QScrollArea - to move a contents widget. The parameters dx and dy are there for convenience, so that the class knows how much should be scrolled (useful e.g. when doing pixel-shifts). You may just as well ignore these values and scroll directly to the position the scroll bars indicate.
Calling this function in order to scroll programmatically is an error, use the scroll bars instead (e.g. by calling QScrollBar::setValue() directly).
Reimplemented from QAbstractScrollArea.
Definition at line 349 of file qscrollarea.cpp.
| void QScrollArea::setAlignment | ( | Qt::Alignment | alignment | ) |
Definition at line 514 of file qscrollarea.cpp.
| void QScrollArea::setWidget | ( | QWidget * | widget | ) |
Sets the scroll area's widget.
The widget becomes a child of the scroll area, and will be destroyed when the scroll area is deleted or when a new widget is set.
The widget's autoFillBackground property will be set to true.
If the scroll area is visible when the widget is added, you must QWidget::show() it explicitly.
Note that You must add the layout of widget before you call this function; if you add it later, the widget will not be visible - regardless of when you QWidget::show() the scroll area. In this case, you can also not QWidget::show() the widget later.
Definition at line 257 of file qscrollarea.cpp.
Referenced by QToolBox::insertItem().
| void QScrollArea::setWidgetResizable | ( | bool | resizable | ) |
Definition at line 381 of file qscrollarea.cpp.
Referenced by QToolBox::insertItem().
|
virtual |
Reimplemented Function
Reimplemented from QAbstractScrollArea.
Definition at line 392 of file qscrollarea.cpp.
| QWidget * QScrollArea::takeWidget | ( | ) |
Removes the scroll area's widget, and passes ownership of the widget to the caller.
Definition at line 286 of file qscrollarea.cpp.
| QWidget * QScrollArea::widget | ( | ) | const |
Returns the scroll area's widget, or 0 if there is none.
Definition at line 228 of file qscrollarea.cpp.
Referenced by setWidget(), QScrollAreaPrivate::updateScrollBars(), and QScrollAreaPrivate::updateWidgetPosition().
| bool QScrollArea::widgetResizable | ( | ) | const |
Referenced by scrollContentsBy().
|
private |
the alignment of the scroll area's widget
By default, the widget stays rooted to the top-left corner of the scroll area.
Definition at line 61 of file qscrollarea.h.
|
private |
whether the scroll area should resize the view widget
If this property is set to false (the default), the scroll area honors the size of its widget. Regardless of this property, you can programmatically resize the widget using widget()->resize(), and the scroll area will automatically adjust itself to the new size.
If this property is set to true, the scroll area will automatically resize the widget in order to avoid scroll bars where they can be avoided, or to take advantage of extra space.
Definition at line 60 of file qscrollarea.h.