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calculatorform.cpp Example File
designer/calculatorbuilder/calculatorform.cpp

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 #include <QtUiTools>
 #include <QtGui>

 #include "calculatorform.h"

 CalculatorForm::CalculatorForm(QWidget *parent)
     : QWidget(parent)
 {
     QUiLoader loader;

     QFile file(":/forms/calculatorform.ui");
     file.open(QFile::ReadOnly);
     QWidget *formWidget = loader.load(&file, this);
     file.close();

     ui_inputSpinBox1 = qFindChild<QSpinBox*>(this, "inputSpinBox1");
     ui_inputSpinBox2 = qFindChild<QSpinBox*>(this, "inputSpinBox2");
     ui_outputWidget = qFindChild<QLabel*>(this, "outputWidget");

     QMetaObject::connectSlotsByName(this);

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(formWidget);
     setLayout(layout);

     setWindowTitle(tr("Calculator Builder"));
 }

 void CalculatorForm::on_inputSpinBox1_valueChanged(int value)
 {
     ui_outputWidget->setText(QString::number(value + ui_inputSpinBox2->value()));
 }

 void CalculatorForm::on_inputSpinBox2_valueChanged(int value)
 {
     ui_outputWidget->setText(QString::number(value + ui_inputSpinBox1->value()));
 }