/****************************************************************************
**
** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#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();
}
