c++/ qt - no such slot - Inheritance - Stack Overflow Qt stores some meta information about classes that inherit from QObject.One of these information is the slots of the class. By static casting an object these meta information doesn't update in cast, so your casted object's meta information doesn't contain the slot you implemented in your MyAxis class. that's why it can't connect the signal to the casted object at runtime. QObject Class | Qt Core 5.12.3 The QObject class is the base class of all Qt objects. QObject is the heart of the Qt Object Model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect() and destroy the connection with disconnect(). Connect with derived class | Qt Forum
I was incorrectly trying to pass a parameter to my slot without a QSignalMapper, which I learned from this SO post. Removing all parameters to the slot function (.h and .cpp) allowed the callback to be found and called. Yes, I'm a Qt n00b. Time to refactor with QSignalMapper :) HTH
qobject(3): base class of all Qt objects - Linux man page The QObject class is the base class of all Qt objects. QObject is the heart of the Qt object model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect() and destroy the connection with disconnect(). QObject Class Reference - University of Texas at Austin The QObject class is the base class of all Qt objects. QObject is the heart of the Qt Object Model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect() and destroy the connection with disconnect(). Qt in Education The Qt object model and the signal slot concept QObject is the base class to most Qt classes. Examples of exceptions are: Classes that need to be lightweight such as graphical primitives Data containers (QString, QList, QChar, etc) Classes that needs to be copyable, as QObject s cannot be copied Qt 4.8: QIODevice Class Reference
I'm working on wireshark source code and i've just add a new class with one slot. hskoglund : I already tried with another name like test_slot that i'm pretty sur there is no similar name but still doesn't work.
Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. QQuickItem Class | Qt Quick 5.12.2 If an implementation ignores the call to QQuickItem::releaseResources(), the item will in many cases no longer have access to a QQuickWindow and thus no means of scheduling cleanup. QAbstractItemModel Class | Qt Core 5.12.3
Feb 2, 2017 ... The correct approach in this case is to use a controller class owning ... slots of A and only when invoked by a signal through a non-direct ... So the first thing to do is to separate the two things, using a QObject as a base interface: ... inside onInvokation() and push the invokation of such slot with emit invoke() .
By itself, a QNode has no visual appearance and no particular meaning, it is there as a way of building a node based tree structure. QTranslator Class | Qt Core 5.12.2 An object of this class contains a set of translations from a source language to a target language. QTranslator provides functions to look up translations in a translation file. Translation files are created using Qt Linguist. Qt 4.6: Porting to Qt 4 The QIconFactory class is no longer part of Qt. It has been replaced by the QIconEngine class. Migrate from GTK+ to Qt - LXDE.org
An object of this class contains a set of translations from a source language to a target language. QTranslator provides functions to look up translations in a translation file. Translation files are created using Qt Linguist.
Drag and Drop | Qt GUI 5.12.3 void DragWidget ::mouseMoveEvent( QMouseEvent *event) { if ( !(event - >buttons() & Qt ::LeftButton)) return; if ((event - >pos() - dragStartPosition) .manhattanLength() < QApplication ::startDragDistance()) return; QDrag *drag = new QDrag( … Calculator Example | Qt Widgets 5.12.3 The private createButton() function is used as part of the widget construction. abortOperation() is called whenever a division by zero occurs or when a square root operation is applied to a negative number. Places (C++) | Qt Location 5.12.3
QObject is the most basic class in Qt. Most of classes in Qt inherit from this class. QObject provides some very powerful capabilities like: object name : you can set a name, as a string, to an object and search for objects by names. parenting system (described in the following section) signals and slots (described in the next chapter) event [solved] unable to accessing signal 'textChanged' from [solved] unable to accessing signal 'textChanged' from base 'QLineEdit' class This topic has been deleted. Only users with topic management privileges can see it. QPushButton Class | Qt 4.8 In Qt, the QAbstractButton base class provides most of the modes and other API, [slot] void QPushButton:: showMenu Shows (pops up) the associated popup menu. If there is no such menu, this function does nothing. This function does not return until the popup menu has been closed by the user. Signals & Slots | Qt 4.8