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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
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+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
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+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
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+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
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+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \example richtext/calendar
+    \title Calendar Example
+
+    The Calendar example shows how to create rich text content and display it using
+    a rich text editor.
+
+    \image calendar-example.png
+
+    Specifically, the example demonstrates the following:
+
+    \list
+      \o Use of a text editor with a text document
+      \o Insertion of tables and frames into a document
+      \o Navigation within a table
+      \o Insert text in different styles
+    \endlist
+
+    The rich text editor used to display the document is used within a main window
+    application.
+
+    \section1 MainWindow Class Definition
+
+    The \c MainWindow class provides a text editor widget and some controls to
+    allow the user to change the month and year shown. The font size used for the
+    text can also be adjusted.
+
+    \snippet examples/richtext/calendar/mainwindow.h 0
+
+    The private \c insertCalendar() function performs most of the work, relying on
+    the \c fontSize and \c selectedDate variables to write useful information to
+    the \c editor.
+
+    \section1 MainWindow Class Implementation
+
+    The \c MainWindow constructor sets up the user interface and initializes
+    variables used to generate a calendar for each month.
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 0
+
+    We begin by setting default values for the selected date that will be highlighted
+    in the calendar and the font size to be used. Since we are using a QMainWindow
+    for the user interface, we construct a widget for use as the central widget.
+
+    The user interface will include a line of controls above the generated calendar;
+    we construct a label and a combobox to allow the month to be selected, and a
+    spin box for the year. These widgets are configured to provide a reasonable range
+    of values for the user to try:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 1
+
+    We use the \c selectedDate object to obtain the current month and year, and we
+    set these in the combobox and spin box:
+
+    The font size is displayed in a spin box which we restrict to a sensible range
+    of values:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 2
+
+    We construct an editor and use the \c insertCalendar() function to create
+    a calendar for it. Each calendar is displayed in the same text editor; in
+    this example we use a QTextBrowser since we do not allow the calendar to be
+    edited.
+
+    The controls used to set the month, year, and font size will not have any
+    effect on the appearance of the calendar unless we make some signal-slot
+    connections:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 3
+
+    The signals are connected to some simple slots in the \c MainWindow class
+    which we will describe later.
+
+    We create layouts to manage the widgets we constructed:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 4
+
+    Finally, the central widget is set for the window.
+
+    Each calendar is created for the editor by the \c insertCalendar() function
+    which uses the date and font size, defined by the private \a selectedDate
+    and \c fontSize variables, to produce a suitable plan for the specified
+    month and year.
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 5
+
+    We begin by clearing the editor's rich text document, and obtain a text
+    cursor from the editor that we will use to add content. We also create a
+    QDate object based on the currently selected date.
+
+    The calendar is made up of a table with a gray background color that contains
+    seven columns: one for each day of the week. It is placed in the center of the
+    page with equal space to the left and right of it. All of these properties are
+    set in a QTextTableFormat object:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 6
+
+    Each cell in the table will be padded and spaced to make the text easier to
+    read.
+
+    We want the columns to have equal widths, so we provide a vector containing
+    percentage widths for each of them and set the constraints in the
+    QTextTableFormat:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 7
+
+    The constraints used for the column widths are only useful if the table has
+    an appropriate number of columns. With the format for the table defined, we
+    construct a new table with one row and seven columns at the current cursor
+    position:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 8
+
+    We only need one row to start with; more can be added as we need them. Using
+    this approach means that we do not need to perform any date calculations
+    until we add cells to the table.
+
+    When inserting objects into a document with the cursor's insertion functions,
+    the cursor is automatically moved inside the newly inserted object. This means
+    that we can immediately start modifying the table from within:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 9
+
+    Since the table has an outer frame, we obtain the frame and its format so that
+    we can customize it. After making the changes we want, we set the frame's format
+    using the modified format object. We have given the table an outer border one
+    pixel wide.
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 10
+
+    In a similar way, we obtain the cursor's current character format and
+    create customized formats based on it.
+
+    We do not set the format on the cursor because this would change the default
+    character format; instead, we use the customized formats explicitly when we
+    insert text. The following loop inserts the days of the week into the table
+    as bold text:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 11
+
+    For each day of the week, we obtain an existing table cell in the first row
+    (row 0) using the table's \l{QTextTable::cellAt()}{cellAt()} function. Since
+    we start counting the days of the week at day 1 (Monday), we subtract 1 from
+    \c weekDay to ensure that we obtain the cell for the correct column of the
+    table.
+
+    Before text can be inserted into a cell, we must obtain a cursor with the
+    correct position in the document. The cell provides a function for this
+    purpose, and we use this cursor to insert text using the \c boldFormat
+    character format that we created earlier:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 12
+
+    Inserting text into document objects usually follows the same pattern.
+    Each object can provide a new cursor that corresponds to the first valid
+    position within itself, and this can be used to insert new content. We
+    continue to use this pattern as we insert the days of the month into the
+    table.
+
+    Since every month has more than seven days, we insert a single row to begin
+    and add days until we reach the end of the month. If the current date is
+    encountered, it is inserted with a special format (created earlier) that
+    makes it stand out:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 13
+
+    We add a new row to the table at the end of each week only if the next week
+    falls within the currently selected month.
+
+    For each calendar that we create, we change the window title to reflect the
+    currently selected month and year:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 14
+
+    The \c insertCalendar() function relies on up-to-date values for the month,
+    year, and font size. These are set in the following slots:
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 15
+
+    The \c setFontSize() function simply changes the private \c fontSize variable
+    before updating the calendar.
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 16
+
+    The \c setMonth slot is called when the QComboBox used to select the month is
+    updated. The value supplied is the currently selected row in the combobox.
+    We add 1 to this value to obtain a valid month number, and create a new QDate
+    based on the existing one. The calendar is then updated to use this new date.
+
+    \snippet examples/richtext/calendar/mainwindow.cpp 17
+
+    The \c setYear() slot is called when the QDateTimeEdit used to select the
+    year is updated. The value supplied is a QDate object; this makes
+    the construction of a new value for \c selectedDate simple. We update the
+    calendar afterwards to use this new date.
+*/