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The Multiple Inheritance Example shows how to use a form created with Qt Designer in an application by subclassing both QWidget and the user interface class, which is Ui::CalculatorForm.
#include "ui_calculatorform.h"As mentioned earlier, the class is a subclass of both QWidget and Ui::CalculatorForm.
class CalculatorForm : public QWidget, private Ui::CalculatorForm { Q_OBJECT public: CalculatorForm(QWidget *parent = 0); private slots: void on_inputSpinBox1_valueChanged(int value); void on_inputSpinBox2_valueChanged(int value); };Two slots are defined according to the automatic connection naming convention required by uic. This is to ensure that QMetaObject's auto-connection facilities connect all the signals and slots involved automatically.
CalculatorForm::CalculatorForm(QWidget *parent) : QWidget(parent) { setupUi(this); }We include two slots, on_inputSpinBox1_valueChanged() and on_inputSpinBox2_valueChanged(). These slots respond to the valueChanged() signal that both spin boxes emit. Whenever there is a change in one spin box's value, we take that value and add it to whatever value the other spin box has.
void CalculatorForm::on_inputSpinBox1_valueChanged(int value) { outputWidget->setText(QString::number(value + inputSpinBox2->value())); }
void CalculatorForm::on_inputSpinBox2_valueChanged(int value) { outputWidget->setText(QString::number(value + inputSpinBox1->value())); }
int main(int argc, char *argv[]) { QApplication app(argc, argv); CalculatorForm calculator; calculator.show(); return app.exec(); }There are various approaches to include forms into applications. The Multiple Inheritance approach is just one of them. See Using a Component in Your Application for more information on the other approaches available.
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