πŸ’ Mapping Many Signals to One

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These drawbacks are addressed by the signals and slots concept of Qt. The first two arguments of connect() specify the sender of the signal: the emitting class​.


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QObject::sender() will return you a pointer to signal sender when you call it from the slot. Reply Quote 2.


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// constructor, destructor, etc. public slots: void onSectionClicked(int logicalIndex).


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slots. The Qt framework offers a flexible message-exchange mechanism that is This is the syntax of a Qt connection: connect(sender, &Sender::signalName.


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QObject::sender() will do the job.


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QObject::sender() will return you a pointer to signal sender when you call it from the slot. Reply Quote 2.


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connect(const QObject *sender, const char *signal, const QObject *receiver, const You can connect a signal to a slot with connect() and destroy the connection.


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These drawbacks are addressed by the signals and slots concept of Qt. The first two arguments of connect() specify the sender of the signal: the emitting class​.


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These drawbacks are addressed by the signals and slots concept of Qt. The first two arguments of connect() specify the sender of the signal: the emitting class​.


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// constructor, destructor, etc. public slots: void onSectionClicked(int logicalIndex).


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Similarly, if you change the text on the buttons for example, "NIL" instead of "0" , the digitClicked int signal will be emitted with an incorrect value.

To illustrate the problem, we will implement a Keypad widget that provides ten QPushButton s, numbered 0 to 9, and a digitClicked int signal that is emitted when the user clicks a button.

When connecting a signal to another signal, the target signal is emitted whenever the first signal is emitted. Finally, the use of sender leads to tightly coupled components, which many people consider to be bad programming style. Instead, the entire signal-related logic is implemented in the Keypad class's constructor:.

QSignalMapper slot qt sender not directly support any other data types. The drawback of this approach is that we need a private slot to do the demultiplexing. QSignalMapper inherits from QObject and provides a means of establishing a relationship between a set of zero-parameter signals and a one-parameter signal or slot.

The most straightforward solution to our problem but also the silliest is to connect the ten QPushButton objects' clicked signals to ten elvis presley slots slots called button0Clicked to button9Clickedeach of which emits the digitClicked int signal with a different parameter value 0 to 9.

The code for main is also missing; we leave its implementation as an exercise slot qt sender the reader.

The call to setMapping inside the for loop establishes a mapping between a button and an integer value; for example, buttons[3] is associated with the integer value 3. The fourth and last approach does not require any private slots, nor does it need a QPushButton subclass. The Layout. Our third approach requires no private slot in Keypad ; instead, we make sure that the buttons themselves emit a clicked int signal that can be directly connected to Keypad 's digitClicked int signal. Let's move on to a better solution. Here's the definition of the Keypad class:. This approach is both flexible and clean, but it is quite cumbersome to write, because it forces us to subclass QPushButton. If a mapping exists for the object that emitted the signal, the mapped int signal is emitted with the integer value set using setMapping. This is possible using the QObject ::sender function, as we will see shortly. When the clicked signal of a button is emitted, QSignalMapper 's map slot is invoked thanks to the connect call in the for loop. The code in buttonClicked isn't very elegant; if you suddenly replace the QPushButton s with another type of widget and forget to change the cast, you will get a crash. The Keypad constructor becomes:. The Signal Mapper Approach. Then we emit the digitClicked int signal with the digit value shown on the button. The Subclass Approach. We start by calling sender to retrieve a pointer to the QObject that emitted the signal that invoked this slot. Each slot simply emits the digitClicked int signal with a different hard-coded argument. That signal is in turn connected to the Keypad 's digitClicked int signal. Although this example isn't about layouts, the code won't compile if we don't implement the createLayout function called from the constructor. Whenever QPushButton emits the clicked signal, we intercept it in our KeypadButton subclass and emit the clicked int signal with the correct digit as the argument. The Trivial Solution. We will review four solutions and discuss their respective merits. The next step is to merge the button N Clicked slots into one private slot that emits the digitClicked int signal with the correct parameter, depending on which button was clicked. The sender Approach. Here's the missing code:. It isn't quite so bad in this example, because Keypad already knows about the button objects, but if buttonClicked was a slot in another class, the use of sender would have the unfortunate effect of tying that class to an implementation detail of the Keypad class. Needless to say, this approach is inflexible and error-prone. This requires subclassing QPushButton as follows:. First, we create a QSignalMapper object. This makes it possible to associate an arbitrary string with a sender object, instead of an integer. In the constructor, we create the QPushButton s, and we tediously connect each button's clicked signal to the corresponding private slot.