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If the slot has primarily optimistic opinions, then it’s likely a scorching slot. If the widget has any youngsters, then they are also painted in the suitable positions. If neither of these is ready, then the title is an empty string. If no express background position is about, the widget inherts its mum or dad widget's background position. If no icon has been set, windowIcon() returns the appliance icon (QApplication::windowIcon()). Returns the visible baby widget at level p in the widget's personal coordinate system. Initializes the painter pen, background and font to the same as the given widget's. See also font(), fontMetrics(), and setFont(). See additionally isWindow(), windowModality, and QDialog. Each QAction and QShortcut handle all the event filtering for you, and provide alerts which are triggered when the person triggers the key sequence, so are much easier to make use of than this low-level operate. This event handler, for occasion event, might be reimplemented in a subclass to obtain mouse launch occasions for the widget. The cursor will assume shape cursor (for as lengthy as the mouse focus is grabbed) and this widget will be the just one to obtain mouse occasions till releaseMouse() is known as(). It should price extra to accumulate more time cords as compared to quicker versions. This event handler is named with the given event when Qt receives a window close request for a high-stage widget from the window system. Identical as mapFromGlobal() if the widget has no parent. The previousInFocusChain operate returns the earlier widget on this widget's focus chain.

Hides the widget. This perform is equivalent to setVisible(false). Note that this perform should not be known as explicitly by the user, since it is meant for reimplementation purposes only. In your reimplementation of this function, if you want to cease the occasion being handled by Qt, return true and set outcome. The operate known as by Qt internally, and the default implementation could not at all times return a valid pointer. Use this operate with excessive caution, and think about using the -nograb command line possibility while debugging. In case you need to change some settings when a widget is polished, reimplement occasion() and handle the QEvent::Polish event kind. This event handler is known as if a drag is in progress, and when any of the following situations occur: the cursor enters this widget, the cursor strikes inside this widget, or a modifier key is pressed on the keyboard while this widget has the main focus. Grabs the mouse input and changes the cursor form. It is nearly never essential to seize the mouse when using Qt, as Qt grabs and releases it sensibly. Particularly, Qt grabs the mouse when a mouse button is pressed and retains it until the final button is released. For example, a web browser would possibly reimplement it to maneuver its "current energetic link" ahead or backward, and name focusNextPrevChild() solely when it reaches the final or first hyperlink on the "web page". I did a bit extra refinement on the Lua bowling example from final time. Now that I am in a position to watch our babysitter, I really feel far more at peace about leaving my child with her. This permits Qt to optimize for more pace and less flicker than a call to repaint() does. This pace optimization doesn't change the outcome, as painting is clipped to that area throughout event processing. In virtually all circumstances replace() is healthier, as it permits Qt to optimize for speed and minimize flicker. For example, calling replace() or repaint() on children inside a paintEvent() leads to undefined conduct; the youngster may or might not get a paint occasion. See additionally repaint(), paintEvent(), setUpdatesEnabled(), and Analog Clock Example. Since Qt 4.0, QWidget robotically double-buffers its painting, so there isn't a need to jot down double-buffering code in paintEvent() to avoid flicker. See additionally closeEvent(), focusInEvent(), focusOutEvent(), enterEvent(), keyPressEvent(), keyReleaseEvent(), leaveEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), moveEvent(), paintEvent(), resizeEvent(), QObject::event(), and QObject::timerEvent(). When altering the position, the widget, if visible, receives a transfer occasion (moveEvent()) instantly.

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