mousePressEvent = lambda event : edit. We would like to show you a description here but the site won’t allow us. 实际上有一种其他技术可以用来获得包装函数和参数的效果。它使用QSignalMapper类，其使用的示例在第9章中显示。 在一些情况下，可以将槽称为信号的结果，并且在槽中直接或间接执行的处理导致最初称为槽的信号被再次调用，导致无限循环。*/ QObject * QSignalMapper:: mapping (QObject * object) const {Q_D (const QSignalMapper); return d-> objectHash. [slot] void QSignalMapper:: map This slot emits signals based on which object sends signals to it. com if any conditions of this licensing are ** not clear to you. Sorted by: 1. From the link: "This class is obsolete. QSignalMapper with signal argument and extra argument. See also Input/Output and Networking . The QSignalMapper class is provided for situations where many signals are connected to the same slot and the slot needs to handle each signal differently. The QSignalMapper class bundles signals from identifiable senders. . } Now the place where you write QTimer::singleShot (0, this, SLOT (doSomething ())); might be inside some processing event. QSignalMapper is used to connect multiple signals to a single slot, and QDialogButtonBox already has a single signal that is emitted for all the buttons: clicked (QAbstractButton*). If it does not goes well, I recommend to start from mapping one single button first and then just add a loop to map few more. The cards are clickable, and lead to the same effect, so the use of QSignalMapper was obvious. Imagine changing buttons to QComboBox or any other UI change. QT supports a collection of events through its object QSignalMapper as demonstrated below: signalMapper = new QSignalMapper(this); signalMapper->setMapping(taxFileButton, QString("taxfile. However, that seems not to. 408 4 4 silver badges 8 8 bronze badges. Is there a way to clear QSignalMapper, or is QSignalMapper automatically cleared when an object is removed. The optional named argument arguments receives a list of strings denoting the argument names. Note that in most cases you can use lambdas for passing custom parameters to slots. You can rate examples to help us improve the quality of examples. The class supports the mapping of particular strings or integers with particular objects using setMapping(). This signal is emitted when map () is signalled from an object that has an integer mapping set. connect (self. Finally, the mapped () signal of the QSignalMapper is connected to a slot, which handles the button press by passing the integer value as a parameter. trigger () behaves correctly, and not act_str. Unfortunately, all attempts of making this used QSignalMapper successfully in a similar situation. addObject("Part::Box", "myBox") s = box. ) in a loop. ** ** Contact info@trolltech. h" #endif // QT_H #ifndef QT_NO_SIGNALMAPPER class QSignalMapperData; struct QSignalMapperRec; class Q_EXPORT QSignalMapper : public QObject {. Related questions. Toggle table of contents sidebar. The class supports the mapping of particular strings or integers with particular objects using setMapping(). I've taken the liberty to add example code to your answer. Add a comment | Your Answer Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. self. The QSignalMapper is used to re-emit signals with optional parameters. @jaouad100 said in How to solve Object::connect: No such signal: void setImage (const QImage &); Make this method as slot: protected slots: void setImage(const QImage &) ; (Z (:^. 3. Note that QSignalMapper is a very old class that was required when it wasn't possible to use lambdas in Qt slots. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. QSignalMapper is the best solution to connect multiple signals to the same slot. PyQt: Changing cursor when hovering a button. QSignalMapper. I think you can use this method: [protected] int QObject:: senderSignalIndex () const. Detailed Description. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Download this example17. QSignalMapper class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the. A QSignalMapper object is one that emits a mapped() signal whenever its map() slot is called. qml. If I click onto a QPushButton, I want to set some text inside the corresponding QLineEdit. Then, create a standalone. So this is like calling doSomething in the next event. This function is typically used together with construct () to perform low-level management of the memory used by a type. Remember that from Qt 5. The basic syntax is : QTimer::singleShot (myTime, myObject, SLOT (myMethodInMyObject ())); with myTime the time in ms, myObject the object which contain the method and myMethodInMyObject the slot to call. QButtonGroup provides an abstract container into which button widgets can be placed. Just right-click any dock title-bar, or any tool-bar or menu-bar. Szőke Szabolcs Szőke Szabolcs. The class supports the mapping of particular strings or integers with particular objects using setMapping(). txt"));A. This was particularly true in older versions of the software, that is, and relied on Qt 4. setBuffer(s) myNode = coin. It behaves essentially like the above function. h" #endif // QT_H #ifndef QT_NO_SIGNALMAPPER class QSignalMapperData; struct QSignalMapperRec; class Q_EXPORT QSignalMapper : public QObject {. QtCore. I have a QTreeWidget in which each of its items has a QComboBox in a column. QtCore. You can connect a signal to a slot with connect (). 2 QSignalMapper with signal argument and extra argument. It allows mapping one or more signals from different objects to a single slot. QtCore. Publish/subscribe to typed events (Could even be QObjects) I was thinking of using QSignalMapper to tag the "named events", then re-emitting from a slot or connecting the publishers signal to the subscriber's signal. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Looks like all good. value ("image"). Calling QComboBox* combo = (QComboBox* )sender() in the slot fails, presumably because sender() is now the QSignalMapper. It does not provide a visual representation of this container (see QGroupBox for a container widget), but instead manages the states of each of the buttons in the group. QSignalMapper is used to connect multiple signals to a single slot, and QDialogButtonBox already has a single signal that is emitted for all the buttons: clicked (QAbstractButton*). – TWE. This function was introduced in Qt 5. MBach. There are the ways to solve that: 实际上有一种其他技术可以用来获得包装函数和参数的效果。它使用QSignalMapper类，其使用的示例在第9章中显示。 在一些情况下，可以将槽称为信号的结果，并且在槽中直接或间接执行的处理导致最初称为槽的信号被再次调用，导致无限循环。 Worth noting (2018, Qt5, C++11) that QSignalMapper is deprecated. QSignalMapper is a class in the Qt framework for C++ programming language. 511 7 7. For the in-process approach, the virtual keyboard becomes just another QWidget or QtQuick Item that shows the keyboard buttons, reacts to user interaction and delivers the synthesized QKeyEvents to the application’s event loop. // create the actual socket. The quick-and-dirty way is to use connect () as usual, and then in your slot method, call sender () to find out which object sent the signal. But I am not able to exactly place, which signal is to be called for which slot. 1. Ask Question Asked 8 years, 2 months ago. QSignalMapper 主要使用的场景是多个 widget 触发同一个 slot，每个 widget 都对应一个数据(mapper->setMapping() 中设置)，在 slot 中只关心数据，并不关心 widget 是谁，例如计算器。 . The class supports the mapping of particular strings or integers with particular objects using setMapping(). In other words (from the documentation): This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to. QtCore. For example, if your product is called Star Runner and your company is called MySoft, you would construct the QSettings object as follows: settings = QSettings("MySoft", "Star Runner")I use a QWidget in a Qthread and I had to modify the image in a Qlabel of multiple object. Try this instead: ( 2 ) 使用QSignalMapper类. This class collects a set of parameterless signals, and re-emits them with integer, string or widget. If you want to do that, you need to either manually connect everything or otherwise do what this guy described: Can QSignalMapper be used to re-emit signals with multiple parameters? and reimplement QSignalMapper for your specific case. Also the fact that i was using SubMenu as argument to setMapping , where as MenuAction item should have been used instead. A button can be made the default button in a dialog by means of setDefault () and setAutoDefault () . QSignalMapper; QSize; QSizeF; QSocketDescriptor; QSocketNotifier; QSortFilterProxyModel; QStandardPaths; QStorageInfo; QStringConverter;. Is there any relatively simple way for it? c++; qt; enums;Here is an easy way to get the 3D representation of an object. QSignalMapper * mapper = new QSignalMapper (this);. 0. @. The. . You can check the return bool and have a look to the output window of your application. fix deprecated warning int QWheelEvent::delta() break macOS build (Page 1) — Code — QElectroTech —The QSignalMapper class bundles signals from identifiable senders. Now, consider discarding those cards, to draw new ones. should be. If you can't afford to lose the original arguments, or if you don't know the source of the signals (as is the case with QDBusConnection::connect() signals), then it doesn't really make sense to use a. Some issues with your code. Description: A cross-platform application and UI framework (mingw-w64) Group(s): mingw-w64-x86_64-qt6 Repo: mingw64 Homepage: existing slots are not recognized. @t-vanbesien said in no matching member function for call to 'connect':. A combobox is a selection widget that displays the current item, and can pop up a list of selectable items. } Ignoring the “captured variables” part for now, here is a simple lambda which increments. With QSignalMapper, trivial change in a . The Combo Widget Mapper example shows how to use a custom delegate to map information from a model to specific widgets on a form. void QSignalMapper::setMapping ( const QObject * sender, const QString & identifier ) [virtual] This is an overloaded member function, provided for convenience. You do not need a QSignalMapper if I understand you correctly but its difficult to tell as you hardly posted any code. We strongly advise against using it in. 1. Using Maintenance Tool #. from PyQt5 import QtCore, QtWidgets class Widget (QtWidgets. toString() # store as string inp = coin. QBitmap is only a convenience class that inherits QPixmap, ensuring a depth of. I have. This function was introduced in Qt 5. [virtual] QSignalMapper:: ~QSignalMapper () Destroys the QSignalMapper. See also setMapping(). 按钮被点击触发信号激活 QSignalMapper的槽函数map ()，map ()会统一释放一个带有标记的信号，该信号触发定义的按钮槽函数，根据标记（ID、 QWidget 、QString）去判断到底. – jonspaceharper But this removes all knowledge of the original sender widget. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. takeAt (i)); for (int i = 0; i < Buttons. QSignalMapper class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. . In other words (from the documentation):. ) is supported. Salut, Si tu souhaites dépendre de la valeur "n", alors commence par l'ajouter en paramètre de cellActivationRegle. I was wondering if that was possible. What i want to achieve is a little different. When creating a QSettings object, you must pass the name of your company or organization as well as the name of your application. ** ** Contact info@trolltech. 8, which signals and slots system was based on the use of macros. Before Qt 5. Just do the same. Possible solution is connect QSlider signal sliderReleased (), emitted when the user releases the slider with the mouse, with QSignalMapper map () and store sliders id with pointer on some list. QSignalMapper classes support SetMapping function to a particular integer or string, and associate a particular object. The Camera Example demonstrates how you can use Qt Multimedia to implement some basic Camera functionality to take still images and record video clips with audio. 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。. qml I have the following signals:. keyboard. By voting up you can indicate which examples are most useful and appropriate. Python QSignalMapper - 14 examples found. This function was introduced in Qt 5. However, the response requires the knowledge of the sender of the signal - for example, it must highlight the entered text with different colors. When you receive a signal, map (), look at QObject::sender () ( link) as the key in the map to make the emit in your turn. There is no such signal mapped (const QPushButton&). It can be subclassed to tailor the look and feel. QObject is the heart of the Qt Object Model. – SPlatten. The Map Viewer example shows how to display and interact with a map, search for an address, and find driving directions. QSignalMapper can not be used for that, but the class is quite simple to re-implement and specialize for your needs. The class supports the mapping of particular strings or integers with particular objects using setMapping (). So I'm dynamically creating QPushButton objects and then mapping them to emit a signal. For strings and integers, you can use QSignalMapper. Qlabel label; QSlider silder; connect (slider, SIGNAL (valueChanged (int)), this, ChangeText (slider, label)); void ChangeText (&slider, &label)To associate your repository with the pyside6-examples topic, visit your repo's landing page and select "manage topics. _mapper =. I am trying to set up a signal-slot arrangement in PyQt where the signal transmits a lot of information. With QSignalMapper, trivial change in a . The class supports the mapping of particular strings or integers with particular objects using setMapping(). The reason why your QSignalMapper code doesn't work is probably because you are connecting to the wrong overload of the mapped signal. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. 画像のような複数のUIの操作に応じて一つのUIを更新する処理は QSignalMapper が担ってきました。 しかし Qt5 では QSignalMapper は非推奨とされ、 ラムダ式 への置き換えが推奨されます。 Using a signal mapper. A QComboBox provides a means of presenting a list of options to the user in a way that takes up the minimum amount of screen space. When value has hanged, QDialog could emit another signal with information of slider id and new value. mapper = new QSignalMapper( this ); connect( mapper, SIGNAL(mapped(QWidget*)), workspace, SLOT(setActiveWindow(QWidget*)) ); I read QSignalMapper can be replaced with lamdas but how in this case? If i understand right mapper forwards all the signals from this to workspaces active window? The trade-off with QSignalMapper is that you gain information about the source of the signal, but you lose the original arguments. In theory, this should work - there is a QSignalMapper. Solved QTimer::singleShot - forward parameter to SLOT called. I can use the encoded row/column to lookup the QComboBox in the table widget but that seems wrong. You can only use the signals that exist in QSignalMapper. For example: // slot method that you've connected all of your widgets' stateChanged (int) signals to void MyClass :: someWidgetsStateChanged (int newState) { const QObject * s = sender. – Detailed Description. Using button and objects in pyqt. 应用场景一般是：你有一些信号，这些信号对应的槽函数内容都差不多，最. because you wrote it in your first answer to this post. Signals and slots are made possible by Qt’s meta-object. You could simply assign a value to the button with a map ( QMap, std::map) or through a dynamic property: @tanmayb, it is already a different question. connect (m_socket, SIGNAL (stateChanged (QAbstractSocket::SocketState)),. The object's mapped widget is passed in. The workaround is to explicitly specify a signal that is compatible with map (). ViewObject. 我现在有一个QML对象<代码>键盘。. QSignalMapper * mapper = new QSignalMapper (this. We are using plugins in our application and different plugins are responsible for different types of objects. map) Tonight's PyQt snapshot will be smarter about finding a usable Qt slot before deciding that it needs to. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. The input fields in the main window have no function other than to accept input. plist file in the application’s bundle (See Qt for macOS - Deployment ). I'd appreciate help as to why the VerticalLineSegment slot updateX is not triggered. You're just not checking for the double click event. For signals with default parameters,. Composite Widgets#. Looks like all good. 2. ** ** Contact [email protected] QSignalMapper is a member variable, and each QCheckBox connects its clicked signal to the map() slot of QSignalMapper. Please check the attached snapshot. As such, QSignalMapper is not deisgned to transfer parameters into other slots for you. I have a QSpinBox and I would like to connect it to a slot with 2 parameters when clicking on the arrows. : The QSignalMapper class is provided for situations where many signals are connected to the same slot and the slot needs to handle each signal differently. void mySlot(int, int); I already connected a slot with one argument like this: QSignalMapper *signalMapper = new QSignalMapper(this); connect(act, SIGNAL(triggered()), s. 2 Answers Sorted by: 2 1) QSignalMapper maps a QObject* sender to a (int, string, QWidget* or QObject*). We would like to show you a description here but the site won’t allow us. Main Page; Packages; Classes; Class List; Class Index; Class Hierarchy; Class MembersThe PySide. Method Documentation QSignalMapper. Connecting C++ Objects to QML Objects. I have followed the answer by X. Orange widgets are building blocks of data analysis workflows that are assembled in Orange’s visual programming environment. QSignalMapper does not update parameter after choosing file. clicked [ ()]. . See this question for three ways of mapping one of a multitude of objects to a value. As far as I can see, QSignalMapper is for the reverse problem, or collecting and collating signals from multiple inputs. This is less costly and will simplify the code. plist JavaScript jpegtran jQuery JSON Leaflet library macOS Mac OS X maps OpenCV open source optimization php point cloud QGraphicsItem QGraphicsScene QGraphicsView. Algunos amigos pueden preguntar, ¿por qué es tan problemático y. Qt does not do any conversion (cast) even if the sender is a QPushButton object that inherits from QWidget. QSignalMapper类可以看成是信号的翻译和转发器。. The object's mapped widget is passed in widget. Eliminate QSignalMapper entirely and connect the button's clicked signal to mySlot. hIf your pointer is an actual pointer to a QPolygonF that cannot be copied (because it's the pointer to the actual item being held in the QGraphicsScene and you therefore need the original pointer to remove it), I think you should just be able to pass that pointer as-is, assuming mapToScene() is returning a reference to it rather than a copy:. You could simply assign a value to the button with a map ( QMap, std::map) or through a. This is done automatically when mapped objects are destroyed. The QSignalMapper is used to re-emit signals with optional parameters. The class supports the mapping of particular strings or integers with particular objects using setMapping(). It is provided to keep old source code working. But the compiler complains about no matching parameters. So far we've created a window and added a simple push button widget to it,. QSignalMapper Class The QSignalMapper class bundles signals from identifiable senders. I have 4 QLineEdits and 4 QPushButtons. If nothing is passed, the new signal will have the same name as the variable that it is being assigned to. clicked. J 1 Reply Last reply 10 May 2018, 05:28 0. I need to implement a simple message bus: One process only thus no need do D-Bus. The QSignalMapper class bundles signals from identifiable senders. Try this instead:( 2 ) 使用QSignalMapper类. For any interested, I worked around the problem using a closure, which seems a bit cleaner from a coding point of view, although I don't have any idea if it is more efficient or not:I'm trying to use QSignalMapper with my buttons, but I can't seem to get it to work to trigger my slot. A typical workflow may mix widgets for data input and filtering, visualization, and predictive data mining. The syntax of a lambda expression is the following: [captured variables] (arguments) {. QtCore. This class collects a set of parameterless signals, and re-emits them with integer or string parameters corresponding to the object that sent the signal. [virtual] QSignalMapper:: ~QSignalMapper Destroys the QSignalMapper. 使用QSignalMapper确定信号的发送者（针对多个发送者的情况） 如果有多个对象都可能发送信号，并且我们希望根据信号发送者来采取不同的操作，可以使用QSignalMapper类。该类可以将多个对象与相应的信号关联起来，并通过sender()方法确定信号的发送者。 Many examples show how to do this with QSignalMapper, but it is not applicable when the signal carries a parameter, as with combobox. Once Qt is installed, you can use Maintenance Tool under <install_dir> to add components and to update or remove installed components. Widgets are grouped into classes according to their function. 在. ** ** Contact info@trolltech. QTimer::singleShot - forward parameter to SLOT called. We are connecting multiple slots, each implemented in a different plugin, to one signal. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the companyTextEdit Example#. This is less costly and will simplify the code. The mentioned message was logged only one time. QSignalMapper. I don't know of a way to do this via the Designer, not familiar with that. The QSignalMapper class bundles signals from identifiable senders. An overview of Qt’s signals and slots inter-object communication mechanism. Simply use a QMap<QObject*,ValueStruct>, where ValueStruct keeps your arguments. you really can't connect to a private slot of a QObject; You are creating a new signal mapper every time you call readCombo which you aren't clearing - resulting memleaks. I want to use a QObject as a carrier by setting the various information I want to transmit as attributes of the QObject. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. QSignalMapper; QSize; QSizeF; QSocketDescriptor; QSocketNotifier; QSortFilterProxyModel; QStandardPaths; QStorageInfo; QStringConverter;. The technique involves reimplementing the qt_metacall method yourself. Qt Library. Then I discovered QSignalMapper which let me tie a QString to a given action. By default, labels display left-aligned, vertically-centered text and images, where any tabs in the text to be displayed are automatically expanded. – Qt Base (Core, Gui, Widgets, Network,. Constructs a QSignalMapper with parent parent. 1 Reply Last reply 10 May 2018, 05:37 0. On the #pyqt channel on Freenode, lauri asked about connecting identically-named signals with different parameters from QSignalMapper to slots. On the #pyqt channel on Freenode, lauri asked about connecting identically-named signals with different parameters from QSignalMapper to slots. connect. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Im creating QSliders and QLabels in my Program and i want to connect them so when I'm changing the Slider the Value should be shown within the label. Use mapped (QWidget*) and change your slot to have the same signature: button_pushed (QWidget*). We had to tell the compiler with a static_cast which overload to use in the connect statements. QSignalMapper offers int, QObject*, QWidget* and QString as mapping values. While trying to connect the buttons' clicked () signals to the textEdit to display the relevant state, I got stuck on an error: Object::connect No such slot QTextEdit::append ("move state") Object. application::processEvents () { // process event list. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Update. 467. Modified 8 years, 2 months ago. Member Function Documentation [explicit] QSignalMapper:: QSignalMapper (QObject *parent = nullptr) Constructs a QSignalMapper with parent parent. The QSignalMapper class bundles signals from identifiable senders. 2. Tu verras que. These are the top rated real world Python examples of PyQt5. You should use direct connection of console and this on readReady (of course with slot of this with void argument as readReady() ). The QSignalMapper class bundles signals from identifiable senders. Simply use a QMap<QObject*,ValueStruct>, where ValueStruct keeps your arguments. I have read a lot of theory about QSignalMapper, QSignalMapper类可以看成是信号的翻译和转发器。. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. The Qt Core module adds these features to C++: a very powerful mechanism for seamless object communication called signals and slots. Adds a mapping so that when map () is signaled from the given sender, the signal mapper ( identifier) is emitted. removeItem () in the connect method will actually try to call the self. 1 Answer. As such, QSignalMapper is not deisgned to transfer parameters into other slots for you. c++; qt; signals; mapper; Share. The QSignalMapper class bundles signals from identifiable senders. Here is my code for the SignalMapper: In my header:. QAbstractButton provides most of the states used for buttons: isDown () indicates whether the button is pressed down. ** **/ #ifndef QSIGNALMAPPER_H #define QSIGNALMAPPER_H #ifndef QT_H #include "qobject. The class supports the mapping of particular strings or integers with particular objects using setMapping (). Is there a more correct way to do. Here is an example how to use setMapping(button,. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. map) checkbox_2. With setMapping the connection between the sender and the value is set up. Qt’s model/view architecture provides a standard way for views to manipulate information in a data source. Hot Network Questions Who or what was the inspiration for Jessica Rabbit?QSignalMapper类可以看成是信号的翻译和转发器。 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。 QSignalMapper类的功能核心是要建立一个从原始信号的object到需要的数据的映射（setMapper函数）。void QSignalMapper::setMapping ( const QObject * sender, const QString & identifier ) [virtual] This is an overloaded member function, provided for convenience. activeDocument(). But I have problem, I don't know how to assign string to a button. Suppose you have three push buttons that determine which file you will open: "Tax File", "Accounts File", or "Report File". Much cleaner code and it’s easier to maintain and modify. Some of these documents were ported from C++ to Python and cover a range of topics, from basic use of widgets to step-by-step tutorials that show how an application is put together. How to map to overload Qt slot. Note that in most cases you can use lambdas for passing custom parameters to slots. 1. QSignalMapper is not about sending arguments from signals to slots but to let signal receiver know "who" was that or what data use. QSignalMapper can not be used for that, but the class is quite simple to re-implement and specialize for your needs. Dynamic Signals and Slots by Eskil A. 1 Answer. If you have to use a QSignalMapper anyway, you have to use the signal QSignalMapper::mapped(QWidget*). cpp file. I have a question about QSignalMapper. __init__ (parent) self. 详细说明 QSignalMapper类捆绑来自可识别发送者的信号。此类收集一组无参数的信号，并使用与发送信号的对象相对应的整数，字符串或窗口小部件参数重新发出它们。该类使用setMapping（）支持特定字符串或整数与特定对象的映射。然后可以将对象的信号连接到map（）插槽，该插槽将发出与原始信令. map(sender) Parameters: sender – PySide6. Here is a simple example. We strongly advise against using it in new code. Hope this helps grokking QSignalMapper a bit more!QSignalMapper is a wonderful class to organize the work of the signals and slots dynamically created objects. cpp. QVariantList , QString (if the list contains exactly one item) Casting between primitive type (int, float, bool etc. ) summary refs log tree commit diff stats 2. The string-based syntax can connect C++ objects to QML objects, but the functor-based syntax cannot. hierarchical and queryable object trees. How can I do that?, in the code I present it receives the. Its been suggested over on the Qt forum to use QSignalMapper, looking into this now. Detailed Description. 1. A combobox may be editable, allowing the user to modify each item in the list. 2. If I correctly understood, each QGraphicsItem has special unique QComboBox. The QSignalMapper class bundles signals from identifiable senders. 1 Answer.