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# mainwindow.cpp Example File
richtext/calendar/mainwindow.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
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    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
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        #include <QtGui>

        #include "mainwindow.h"

        MainWindow::MainWindow()
        {
            selectedDate = QDate::currentDate();
            fontSize = 10;

            QWidget *centralWidget = new QWidget;

            QLabel *dateLabel = new QLabel(tr("Date:"));
            QComboBox *monthCombo = new QComboBox;

            for (int month = 1; month <= 12; ++month)
                monthCombo->addItem(QDate::longMonthName(month));

            QDateTimeEdit *yearEdit = new QDateTimeEdit;
            yearEdit->setDisplayFormat("yyyy");
            yearEdit->setDateRange(QDate(1753, 1, 1), QDate(8000, 1, 1));

            monthCombo->setCurrentIndex(selectedDate.month() - 1);
            yearEdit->setDate(selectedDate);

            QLabel *fontSizeLabel = new QLabel(tr("Font size:"));
            QSpinBox *fontSizeSpinBox = new QSpinBox;
            fontSizeSpinBox->setRange(1, 64);
            fontSizeSpinBox->setValue(10);

            editor = new QTextBrowser;
            insertCalendar();

            connect(monthCombo, SIGNAL(activated(int)), this, SLOT(setMonth(int)));
            connect(yearEdit, SIGNAL(dateChanged(QDate)), this, SLOT(setYear(QDate)));
            connect(fontSizeSpinBox, SIGNAL(valueChanged(int)),
                    this, SLOT(setFontSize(int)));

            QHBoxLayout *controlsLayout = new QHBoxLayout;
            controlsLayout->addWidget(dateLabel);
            controlsLayout->addWidget(monthCombo);
            controlsLayout->addWidget(yearEdit);
            controlsLayout->addSpacing(24);
            controlsLayout->addWidget(fontSizeLabel);
            controlsLayout->addWidget(fontSizeSpinBox);
            controlsLayout->addStretch(1);

            QVBoxLayout *centralLayout = new QVBoxLayout;
            centralLayout->addLayout(controlsLayout);
            centralLayout->addWidget(editor, 1);
            centralWidget->setLayout(centralLayout);

            setCentralWidget(centralWidget);
        }

        void MainWindow::insertCalendar()
        {
            editor->clear();
            QTextCursor cursor = editor->textCursor();

            QDate date(selectedDate.year(), selectedDate.month(), 1);

            QTextTableFormat tableFormat;
            tableFormat.setAlignment(Qt::AlignHCenter);
            tableFormat.setBackground(QColor("#e0e0e0"));
            tableFormat.setCellPadding(2);
            tableFormat.setCellSpacing(4);
            QVector<QTextLength> constraints;
            constraints << QTextLength(QTextLength::PercentageLength, 14)
                        << QTextLength(QTextLength::PercentageLength, 14)
                        << QTextLength(QTextLength::PercentageLength, 14)
                        << QTextLength(QTextLength::PercentageLength, 14)
                        << QTextLength(QTextLength::PercentageLength, 14)
                        << QTextLength(QTextLength::PercentageLength, 14)
                        << QTextLength(QTextLength::PercentageLength, 14);
            tableFormat.setColumnWidthConstraints(constraints);

            QTextTable *table = cursor.insertTable(1, 7, tableFormat);

            QTextFrame *frame = cursor.currentFrame();
            QTextFrameFormat frameFormat = frame->frameFormat();
            frameFormat.setBorder(1);
            frame->setFrameFormat(frameFormat);

            QTextCharFormat format = cursor.charFormat();
            format.setFontPointSize(fontSize);

            QTextCharFormat boldFormat = format;
            boldFormat.setFontWeight(QFont::Bold);

            QTextCharFormat highlightedFormat = boldFormat;
            highlightedFormat.setBackground(Qt::yellow);

            for (int weekDay = 1; weekDay <= 7; ++weekDay) {
                QTextTableCell cell = table->cellAt(0, weekDay-1);
                QTextCursor cellCursor = cell.firstCursorPosition();
                cellCursor.insertText(QString("%1").arg(QDate::longDayName(weekDay)),
                                      boldFormat);
            }

            table->insertRows(table->rows(), 1);

            while (date.month() == selectedDate.month()) {
                int weekDay = date.dayOfWeek();
                QTextTableCell cell = table->cellAt(table->rows()-1, weekDay-1);
                QTextCursor cellCursor = cell.firstCursorPosition();

                if (date == QDate::currentDate())
                    cellCursor.insertText(QString("%1").arg(date.day()), highlightedFormat);
                else
                    cellCursor.insertText(QString("%1").arg(date.day()), format);

                date = date.addDays(1);
                if (weekDay == 7 && date.month() == selectedDate.month())
                    table->insertRows(table->rows(), 1);
            }

            setWindowTitle(tr("Calendar for %1 %2"
                ).arg(QDate::longMonthName(selectedDate.month())
                ).arg(selectedDate.year()));
        }

        void MainWindow::setFontSize(int size)
        {
            fontSize = size;
            insertCalendar();
        }

        void MainWindow::setMonth(int month)
        {
            selectedDate = QDate(selectedDate.year(), month + 1, selectedDate.day());
            insertCalendar();
        }

        void MainWindow::setYear(QDate date)
        {
            selectedDate = QDate(date.year(), selectedDate.month(), selectedDate.day());
            insertCalendar();
        }