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

        #include <QtGui/QtGui>
        #include <QtDesigner/QFormBuilder>

        #include "calculatorform.h"

        CalculatorForm::CalculatorForm(QWidget *parent)
            : QWidget(parent)
        {
            QFormBuilder builder;
            QFile file(":/forms/calculatorform.ui");
            file.open(QFile::ReadOnly);
            QWidget *formWidget = builder.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()));
        }