map ()This method is also a Qt slot with the C++ signature void map(). If cell widget A is replaced with cell widget B, cell widget A will be deleted. The input fields in the main window have no function other than to accept input. see documentation: 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. Your timer should be connected to that slot that does the processing, then from this slot emit a signal with the QPixmapThe documentation (Qt 5 latest version) of QThread, you'll see the various implementation possibilities. RamzyKaram92 last edited by . RamzyKaram92 last edited by . connect (signalMapper. It is provided to keep old source code working. We connect each button’s clicked () signal to the signal mapper’s map () slot, and create a mapping in the signal mapper from each button to the. Show Printable Version; 13th January 2008, 21:14 #1. 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 QSignalMapper class bundles signals from identifiable senders. Finally we connect the signal mapper's mappedString() signal to the. See also setMapping(). [virtual] QSignalMapper:: ~QSignalMapper Destroys the QSignalMapper. RamzyKaram92 last edited by . @tanmayb, it is already a different question. So one would. Results 1 to 1 of 1 Contact Us; Qt Centre; Archive; Top; All times are GMT +1. mapped [int]. The class supports the mapping of particular strings or integers with particular objects using setMapping(). The optional named argument name defines the signal name. Have a look at QSignalMapper's documentation, there's an example of how it works. But we also want to know which button triggered the signal. [virtual] QSignalMapper:: ~QSignalMapper Destroys the QSignalMapper. __init__ (self, QObject parent = None)The parent argument, if not None, causes self to be owned by Qt instead of PyQt. clicked. [virtual] QSignalMapper:: ~QSignalMapper Destroys the QSignalMapper. I have used the example code below. Only users with topic management privileges can see it. The code below returns no error, but just the act_int. Qt QSignalMapper is emitting a signal for every item in the map. A signal mapper is constructed and for each text in the list a QPushButton is created. A TableModel is a natural choice for the model. an int and a std::string. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interesting1 Answer. Thread: ? about QSignalMapper. Can you describe the workflow of that functionality ? e. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interestingA list of texts is passed to the constructor. This topic has been deleted. It's more about the design. The only function that we need to implement is the constructor: SIGNAL (clicked ()) SLOT (map ())); signalMapper. Both model and pie series properties can be used to manipulate the data. 10 QSignalMapper is deprecated: This class is obsolete. RamzyKaram92 last edited by . Keep in mind, it does not disconnect button. It doesn't work this way. For example, in the code snippet below, the QLineEdit object. The class supports the mapping of particular strings or integers with particular objects using setMapping (). 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. 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. This topic has been deleted. RamzyKaram92 last edited by . A list of texts is passed to the constructor. RamzyKaram92 last edited by . Create a signal mapper: signalMapper = QSignalMapper () Associate a mapping of type int with the callback function: signalMapper. More. Now inside of readCombo i want to read a string and pass it to change picture: QString imageFileName = xmlreader->attributes (). But, this example code from 4. An overview of Qt's signals and slots inter-object communication mechanism. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interesting1 Answer. void QSignalMapper::removeMappings ( const QObject * sender )void QSignalMapper::mapped ( const QString & ) [signal] This is an overloaded member function, provided for convenience. Have a look at QSignalMapper's documentation, there's an example of how it works. QSignalMapper Example Revisited. The QSignalMapper class bundles signals from identifiable senders. A signal mapper is constructed and for each text in the list a QPushButton is created. See also setMapping(). QGridLayout *gridLayout = new. If you need to map this button again - call mapper->setMapping(button, i) again. QSignalMapper can not be used for that, but the class is quite simple to re-implement and specialize for your needs. This function was introduced in Qt 5. The second connect fails because there is no signal QSIgnalMapper::mapped(int, bool); The signal mapper will emit a signal with and argument value that was the second argument to the setMapping call for the respective sender object. Header: #include <QSignalMapper> qmake: QT += core Inherits: QObject. Signal is the base implementation of the Signal and can be created on a per instance level. . The Combo Widget Mapper example shows how to use a custom delegate to map information from a model to specific widgets on a form. The setMapping function assigns a unique integer value (1 and 2) to each button. In this example, the QSignalMapper object is created and connected to the clicked () signal of two buttons. Finally we connect the signal mapper’s mappedString () signal to the custom widget’s. See also Input/Output and Networking. 20. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interesting8. HTML code is Off. Again, we create a Window class with. . Member Function DocumentationForums; Tutoriels; Magazine; FAQs; Blogs; Projets; Chat; Newsletter; Accueil Actualités IT Pro Conception Cycle de vie du logiciel ConceptionQyoto is a C# language binding for Qt. This function was introduced in Qt 5. It behaves essentially like the above function. Only users with topic management privileges can see it. The only function that we need to implement is the constructor: A list of texts is passed to the constructor. 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. See also setMapping(). RamzyKaram92 last edited by . . QSignalMapper我们可以理解为转发器，此话怎讲呢？比如，按钮点击的响应槽，绑定到QSignalMapper上，QSignalMapper收到按钮的点击后，又通知到另外的控件上做处理。有的朋友会问了，为什么要这么麻烦，需要转一手，不能去掉中间的QSignalMapper，而直接调用吗。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. Qt Signal Slot Mapper Usb; Qt Signal Slot Mapper Software; Qt Signal Slot Mapper App【Qt】QSignalMapperは まいそうされます。 - カンテラの光の下で; 概要. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters. 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. In other words (from the documentation):. The main focus is on how the extra input panel can be used to input text without the need for a real keyboard or keypad. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interestingyeah, because i'll destroy it when it opens cause it have a button to ask me if i agree on the values, and when i press confirm, it will close)) but i'm sorry, i guess i've another issue with the Timer ?! and the SignalMapper parameters ?!Example 1: In this example, we have multiple buttons (btn1, btn2, and btn3) and we want to connect them all to a single slot. ) summary refs log tree commit diff statsUsing a signal mapper. In Qt 5 using it would be outright an antipattern since you can connect to std::bind or a lambda. These are the top rated real world Python examples of PyQt5. QSignalMapper* signalMapper = new QSignalMapper(this); QString val = tableUsers - >item ( y, x)- >text ();The solution is very simple. public: QSignalMapper* windowLblSignal; cv::VideoCapture CapObjLabel; cv::Mat orignFrame; QImage qimgOriginal; QTimer* tmrWindowTimer; public: ImgClass(); void waitForUser(QLabel *windowLabel); public slots: void changeWindowLabel(QLabel* windowLabel); i've tried to insert QObject or QWidget but it didn't work also sorry, it is my. Hope you found it useful. The SQL Widget Mapper example shows how to use a map information from a database to widgets on a form. 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. Qt Base (Core, Gui, Widgets, Network,. A signal mapper is constructed and for each text in the list a QPushButton is created. Re: Passing a pointer in Signal/Slot Connection. code an addDestinationSlot method that takes a QString/slot pair and maps the string to the slot. 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. A slot is any callable function or method. 5. But signal mapper doesn't send any signal to the slo. It is provided to keep old source code working. 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. . A signal mapper is constructed and for each text in the list a QPushButton is created. I have a QTableView which has some QString based items in its model. MainWindow::MainWindow (QWidget *parent) : QMainWindow (parent) , ui (new. cpp []. This can be useful when weprovide the user with many ways of performing the same operation. Or just change On_clicked into slot and connect signal mapped (int) to it (use SLOT keyword then). There are the ways to solve that: It's actually a problem with QSignalMapper. Hello friends, I am using multiple QPushButtons in my project. I have read a lot of theory about QSignalMapper,Longer, more detailed code examples can be found via the Overviews_and_Guides page. This slot emits signals based on the sender object. It really doesn't need know about that QLabel. Let us bring the thrills of Atlantic City to your doorstep with a large array of Blackjack, Roulette, Slots, Video Poker, Table Games, and Big Jackpot slots. The QSignalMapper class bundles signals from identifiable senders. So, I added my own SLOT (doThings (int)). RamzyKaram92 last edited by . Then don't try to do everything at once. RamzyKaram92 last edited by . This signal is emitted when map() is signaled from an object that has a string mapping set. I hava a problem when I use QSignalMapper. QSignalMapper is a class in Qt library that is used to map multiple signals to a single slot. SIGNAL ("clicked (int)")) Having self. Then you can just call mapper->removeMapping(button) on the appropriate button. 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。. The class supports the mapping of particular strings or integers with particular objects using setMapping (). Both model and series properties can be used to manipulate the data. Also, since you want to do it at. Only users with topic management privileges can see it. Qt Base (Core, Gui, Widgets, Network,. Felgo Services App Development Mobile and desktop application development Embedded Development Applications and companion apps for embedded Qt Consulting and Development Ask our help for anything Qt related Qt Trainings and Workshops Book trainings and tailored workshops Qt 6 Porting and Migration Migration, modernization,. void QSignalMapper::removeMappings ( const QObject * sender )void QSignalMapper::map ( QObject * sender) [slot] This is an overloaded member function, provided for convenience. Hello friends, I am using multiple QPushButtons in my project. 4351. The object's mapped widget is passed in widget. The class supports the mapping of particular strings or integers with particular objects using setMapping(). This function was introduced in Qt 5. QSignalMapper class bundles signals from identifiable senders. It behaves essentially like the above function. In the Combo Widget Mapper Example, we showed how to use a named mapping between a widget mapper and a QComboBox widget with a special purpose model to relate values in the model to a list of choices. 2. This why I use signalMapper so that, immediately after the toggle, I can pass a reference to the toggled checkbox as a parameter to my custom slot. You can't execute code inside SLOT (). . I have three classes, that need to cooperate. An instance of PythonQtSignalTarget is created as virtual slot for the corresponding python method 2. mapper = QSignalMapper () checkBox = model. And notice that On_Clicked function you defined is not a class method which you would need. Your timer should be connected to that slot that does the processing, then from this slot emit a signal with the QPixmapQt Signal mapper and sending QLabel by reference and OpenCv 2. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Every user-defined dialog, main window or widget that is loaded by the python-class ui or that is loaded from a plugin, contains one instance of this class. . You can rate examples to help us improve the quality of examples. rs crate page Links; Repository Crates. See also setMapping(). Using a QSignalMapper for that task is just an overkill. You can only use the signals that exist in QSignalMapper. The QSignalMapper class bundles signals from identifiable senders. QtCore. Replies: 1 Views: 2,998; Last Post By: Last Post: 3rd January 2017 10:07 by anda_skoa . [signal] void QSignalMapper:: mappedWidget (QWidget *widget) This signal is emitted when map() is signalled from an object that has a widget mapping set. Any model derived from QAbstractItemModel can be used as the source of. Signals and slots are made possible by Qt's meta-object system. 15. Template:Abstract. Looks like all good. 15] void QSignalMapper:: mappedString (const QString &text) This signal is emitted when map() is signalled from an object that has a string mapping set. As finmor suggests, you should look at. These are the top rated real world Python examples of PyQt5. See also setMapping(). 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. Constructs a QSignalMapper with parent parent. Note that in mostI have been trying to implement signal mapper. I have used the example code below. Qt Signal mapper and sending QLabel by reference and OpenCv 2. 2. QSignalMapper Example Revisited. There is no such signal mapped (const QPushButton&). Oldest to Newest; Newest to Oldest; Most Votes; Reply. This signal is emitted when map() is signaled from an object that has a string mapping set. There is no such signal mapped (const QPushButton&). mapper, QtCore. void QSignalMapper::mapped ( const QString & ) [signal] This is an overloaded member function, provided for convenience. Since then, Qt5 has been released and C++11 is now A Thing. mapped [int]. But we also want to know which button triggered the signal. In this article, we will explore the mechanisms powering the Qt queued connections. This topic has been deleted. clicked. )), workspace, SLOT(setActiveWindow(QWidget. The object's mapped widget is passed in. [signal] void QSignalMapper:: mapped (QWidget *widget) This function is obsolete. We connect each button's clicked() signal to the signal mapper's map() slot, and create a mapping in the signal mapper from each button to the button's text. void QSignalMapper::map ( QObject * sender) [slot] This is an overloaded member function, provided for convenience. This is done automatically when mapped objects are destroyed. I am able to run my android qt app on a real android 11 (general mobile G510) mobile phone BUT I cannot run same app in a android virtual device. Forum: Qt Programming. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. The class supports the mapping of particular strings or integers with particular objects using setMapping (). There is a problem in the connection since the compiler cannot understand it since there are signal and slots overloads. 2 Qt QSignalMapper doesn't work. Finally we connect the signal mapper’s mappedString () signal to the custom widget’s. See also setMapping(). void QSignalMapper::mapped ( const QString & ) [signal] This is an overloaded member function, provided for convenience. The class supports the mapping of particular strings or integers with particular objects using PySide. __init__ (self, QObject parent = None)The parent argument, if not None, causes self to be owned by Qt instead of PyQt. QSignalMapper(30). For example, the dynamically created buttons or objects in QStackedWidget. The class supports the mapping of particular strings or integers with particular objects using setMapping (). QSignalMapperinherits from QObject and provides a means of establishing arelationship between a set of zero-parameter signals and aone-parameter signal or slot. Now i want to map all of them in a signal mapper. 3 Answers. The object's mapped integer is passed in i. If nothing is passed, the new signal will have the same name as the variable that it is being assigned to. In the Combo Widget Mapper Example, we showed how to use a named mapping between a widget mapper and a QComboBox widget with a special purpose model to relate values in the model to a list of. Python QSignalMapper - 59 examples found. Connect (stackedwidget->currentactivewidget,SIGNAL (OnAction ()),this,SLOT (PrivateSlot ())); PrivateSlot () is a slot declared privately. So, I added my own SLOT(doThings(int)). if you call. [signal] void QSignalMapper:: mappedWidget (QWidget *widget) This signal is emitted when map() is signalled from an object that has a widget mapping set. 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. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interesting ^_^ [signal, since 5. . The class supports the mapping of particular strings or integers with particular objects using setMapping(). The only function that we need to implement is the constructor: SIGNAL (clicked ()) SLOT (map ())); signalMapper. Hello Everybody, this is my first post, so i hope that i won't mess with the rules, also a small note, i'm a newbie in Qt, just one month old, it is very interestingQt Signal mapper and sending QLabel by reference and OpenCv 2. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters. One of the cool things introduced in Qt5 is a new overload for the QObject::connect () method: C++. It behaves essentially like the above function. You can then use QObject::sender () within the slot to determine which object emitted a signal. Every time the current index changes, each widget is updated with data from the model via the property specified when its mapping was made. Please let me know!A vertical model mapper is used to create a connection between a line, spline, or scatter series and the data model that has X and Y columns for the coordinates and holds the data points for the XYSeries as rows. Only users with topic management privileges can see it. Playing online blackjack for free also helps you to develop your strategy without risking your own cash. This ensures that all instances of your class will have the signal, but can be managed individually. Example We can create a method (slot) that is connected to a widget. See also setMapping(). __init__ (self, QObject parent = None)The parent argument, if not None, causes self to be owned by Qt instead of PyQt. Qt Signal Slot Mapper Usb; Qt Signal Slot Mapper Software; Qt Signal Slot Mapper AppAbout this app. 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. . removeItem () in the connect method will actually try to call the self. Enjoy all the popular free blackjack games right here, with no sign up and no download needed. Sometimes, however, we would like the slot to behave slightlydifferently depending on which widget invoked it. 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. 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. mapper, QtCore. waitForUser(ui->lblNewValues); // Show the user the values he collected // this here is a memory eater since you never destroy it (it will be at program's end but until t. This class can tell the outside world that its state has changed by emitting a signal, valueChanged(), and it has a slot which other objects can send signals to. Only users with topic management privileges can see it. Otherwise, QSignalMapper is useless. connect. Toggle line numbers. Pixelator example shows how a QML TableView and a delegate can be used for custom table models. 8 doesn't have SLOT getting signal from 'mapped'. RamzyKaram92 last edited by . 8 doesn't have SLOT getting signal from 'mapped'. connect (self. Signal/Slot while model inserts and removes rows in QTableView dynamically. void QSignalMapper::setMapping ( const QObject * sender, const QString & identifier ) [virtual] This is an overloaded member function, provided for convenience. 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. This topic has been deleted. The PySide. A list of texts is passed to the constructor. On __enter__ the signals of the given object are blocked and on __exit__ the blocked state is set to the previous state. value ("image"). The input fields in the main window have no function other than to accept input. For example, as shown in the diagram, we insert three columns before column 4, so first is 4 and last is 6: beginInsertColumns(parent,4,6); This inserts the three new columns as columns 4, 5, and 6. 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. A signal mapper is constructed and for each text in the list a QPushButton is created. until that, do you see anything might make an issue in the co. When I'm doing a mapping and that the argument passed to the function is an int, everything works just fine, but when it is a string, nothing happen. include <QtGui/QApplication> include "buttonwidget. Qt does not do any conversion (cast) even if the sender is a QPushButton object that inherits from QWidget. yeah, because i'll destroy it when it opens cause it have a button to ask me if i agree on the values, and when i press confirm, it will close)) but i'm sorry, i guess i've another issue with the Timer ?! and the SignalMapper parameters ?!hi, this is my code to display a QComboBox in a QTableWidget and using QSignalMapper to re-emit the signal but the output is Object::connect: No such signal QComboBox::currentIndexChanged () Qt Code: Switch view. When you receive a signal, map (), look at QObject::sender () ( link) as the key in the map to make the emit in your turn. void QSignalMapper::mapped ( const QString & text) [signal] This is an overloaded member function, provided for convenience. Keep the image processing in BinaryImage and emit the QPixmap when ready. More. Just do the same. 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 only function that we need to implement is the constructor: A list of texts is passed to the constructor. . This signal is emitted when map() is signaled from an object that has a string mapping set. A section is a column of a model if the orientation is horizontal (the default), otherwise a row. Only users with topic management privileges can see it. The QSignalMapper class bundles signals from identifiable senders. You can then use QObject::sender () within the slot to determine which object emitted a signal. Only users with topic management privileges can see it. But signal mapper doesn't send any signal to the slot. Model mappers enable using a data model derived from the QAbstractItemModel class as a data source for a chart. Conway’s Game of Life example shows how the QML TableView type can be used to display a C++ model that the user can pan around. Then a QObjectPrivate::Connection object is created and added in the internal linked lists. ) Since the signatures are compatible, the compiler can help us detect type mismatches. So i am using QSignalMapper. Is there a way to clear QSignalMapper, or is QSignalMapper automatically cleared when an object is removed. This signal is emitted when map() is signaled from an object that has a string mapping set. )) ); 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? I have been trying to implement signal mapper. Qt Code: Switch view. [signal, since 5. RamzyKaram92 last edited by . The Simple Widget Mapper example shows how to use a widget mapper to display data from a model in a collection of widgets. The QSignalMapper class bundles signals from identifiable senders. 15. 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. e. QSignalMapper(QObject *parent = nullptr) virtual ~QSignalMapper()void. R. Forums; Tutoriels; Magazine; FAQs; Blogs; Projets; Chat; Newsletter; Accueil Actualités IT Pro Conception Cycle de vie du logiciel ConceptionThe QSignalMapper class bundles signals from identifiable senders. Qt Signal mapper and sending QLabel by reference and OpenCv 2. connect (self. This enum value can be used to set custom label text per-point. We filter the data supplied by the model by calling the setRootIndex() function on each view, passing a. This can be achieved using QSignalMapper. Only users with topic management privileges can see it. void QSignalMapper::removeMappings ( QObject * sender) Removes all mappings for sender. QSignalMapper Class The QSignalMapper class bundles signals from identifiable senders. Connect returns true if it successfully connects the signal to the slot. ButtonWidget :: ButtonWidget ( const QStringList & texts, QWidget * parent) : QWidget (parent) { QGridLayout * gridLayout = new QGridLayout ; for ( int i = 0; i < texts. The connection is established as follows: 1. Go to Qt Creator Project settings and check the all ABIs like my screenshot. You can invoke a slot with QMetaObject::invokeMethod. Types used in signal/slot connections must be fully 'scoped' because the method call is converted into text, so your connection call should look like this: QObject::connect (&myClassA, SIGNAL (theSignal (namespace::myClassA::aStruct)), &myClassB, SLOT (theSlot (namespace::myClassA::aStruct))); You'll probably have to. . So that's 2N allocations. Custom mapping allows to take only part of the data from. It behaves essentially like the above function. Use a signal that looks like: @ signals: void newPixmapReady(const QPixmap& pixmap); @ If you don't want to lock your GUI thread, you can get some inspiration from the Mandelbrot exampleThe QSignalMapper class is provided for situations where many signals are connected to the same slot and the slot needs to handle each signal differently. This is an overloaded function. This signal is emitted when map() is signaled from an object that has a string mapping set. QSignalMapper, QMenu and custom context menu. QSignalMapper can not be used for that, but the class is quite simple to re-implement and specialize for your needs. map) @ void NewValues::on_btnStart_clicked() { BinaryImage mBinaryImage; mBinaryImage. The SQL Widget Mapper example shows how to use a map information from a database to widgets on a form. Anyway, one of the thing is that you are mapping the mapper to the widget which is not the way it's supposed to work. Note that in mostQt Signal mapper and sending QLabel by reference and OpenCv 2. Qt Signal mapper and sending QLabel by reference and OpenCv 2. This topic has been deleted. self. void QSignalMapper::removeMappings ( const QObject * sender )The NEON MA8100A Signal Mapper is a 3D in-building coverage mapping solution for use with Anritsu handheld instruments. In the Combo Widget Mapper Example, we showed how to use a named mapping between a widget mapper and a QComboBox widget with a special purpose model to relate values in the model to a list of choices. Then my earlier suggestions still stand. The following example uses old-style signals and slots connections to explicitly specify the signals to be connected to slots in a Python subclass of QWidget. Standard widgets use data that is part of the widget. The QDataWidgetMapper class allows information obtained from a model to be viewed and edited in a collection of widgets instead of in an item view. The QSignalMapper class bundles signals from identifiable senders. The Input Panel example shows how to create an input panel that can be used to input text into widgets using only the pointer and no keyboard. thanks SGaist, you understood very well, and Binary Image Class has alot of roles to do, alot of caluclations and anding operation between filtered images, i'll try to look at the QInputDialog. Instruments supported include Field Master Pro, LMR Master, Spectrum Master, Site Master, BTS Master, Cell Master, and VNA Master. This slot emits signals based on the sender object. removeItem, QtCore. Then my earlier suggestions still stand. First, we create a QSignalMapper object. If the code is longer than one screen at normal point size, it might be better if you provide a rationale and a link, or just put it on a separate page. QSignalMapper extracted from open source projects. 1. I have used the example code below. void QSignalMapper::mapped ( int i) [signal] This signal is emitted when map() is signalled from an object that has an integer mapping set. All of them should go inside 1 slot. At least, that is the safest way to do a cast.