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/*!

    \example richtext/orderform

    \title Order Form Example

    The Order Form example shows how to generate rich text documents by

    combining a simple template with data input by the user in a dialog. Data

    is extracted from a \c DetailsDialog object and displayed on a QTextEdit

    with a QTextCursor, using various formats. Each form generated is added

    to a QTabWidget for easy access.

    \image orderform-example.png

    \section1 DetailsDialog Definition

    The \c DetailsDialog class is a subclass of QDialog, implementing a slot

    \c verify() to allow contents of the \c DetailsDialog to be verified later.

    This is further explained in \c DetailsDialog Implementation.

    \snippet examples/richtext/orderform/detailsdialog.h 0

    The constructor of \c DetailsDialog accepts parameters \a title and

    \a parent. The class defines four \e{getter} functions: \c orderItems(),

    \c senderName(), \c senderAddress(), and \c sendOffers() to allow data

    to be accessed externally.

    The class definition includes input widgets for the required

    fields, \c nameEdit and \c addressEdit. Also, a QCheckBox and a

    QDialogButtonBox are defined; the former to provide the user with the

    option to receive information on products and offers, and the latter

    to ensure that buttons used are arranged according to the user's native

    platform. In addition, a QTableWidget, \c itemsTable, is used to hold

    order details.

    The screenshot below shows the \c DetailsDialog we intend to create.

    \image orderform-example-detailsdialog.png

    \section1 DetailsDialog Implementation

    The constructor of \c DetailsDialog instantiates the earlier defined fields

    and their respective labels. The label for \c offersCheckBox is set and the

    \c setupItemsTable() function is invoked to setup and populate

    \c itemsTable. The QDialogButtonBox object, \c buttonBox, is instantiated

    with \gui OK and \gui Cancel buttons. This \c buttonBox's \c accepted() and

    \c rejected() signals are connected to the \c verify() and \c reject()

    slots in \c DetailsDialog.

    \snippet examples/richtext/orderform/detailsdialog.cpp 0

    A QGridLayout is used to place all the objects on the \c DetailsDialog.

    \snippet examples/richtext/orderform/detailsdialog.cpp 1

    The \c setupItemsTable() function instantiates the QTableWidget object,

    \c itemsTable, and sets the number of rows based on the QStringList

    object, \c items, which holds the type of items ordered. The number of

    columns is set to 2, providing a "name" and "quantity" layout. A \c for

    loop is used to populate the \c itemsTable and the \c name item's flag

    is set to Qt::ItemIsEnabled or Qt::ItemIsSelectable. For demonstration

    purposes, the \c quantity item is set to a 1 and all items in the

    \c itemsTable have this value for quantity; but this can be modified by

    editing the contents of the cells at run time.

    \snippet examples/richtext/orderform/detailsdialog.cpp 2

    The \c orderItems() function extracts data from the \c itemsTable and

    returns it in the form of a QList<QPair<QString,int>> where each QPair

    corresponds to an item and the quantity ordered.

    \snippet examples/richtext/orderform/detailsdialog.cpp 3

    The \c senderName() function is used to return the value of the QLineEdit

    used to store the name field for the order form.

    \snippet examples/richtext/orderform/detailsdialog.cpp 4

    The \c senderAddress() function is used to return the value of the

    QTextEdit containing the address for the order form.

    \snippet examples/richtext/orderform/detailsdialog.cpp 5

    The \c sendOffers() function is used to return a \c true or \c false

    value that is used to determine if the customer in the order form

    wishes to receive more information on the company's offers and promotions.

    \snippet examples/richtext/orderform/detailsdialog.cpp 6

    The \c verify() function is an additionally implemented slot used to

    verify the details entered by the user into the \c DetailsDialog. If

    the details entered are incomplete, a QMessageBox is displayed

    providing the user the option to discard the \c DetailsDialog. Otherwise,

    the details are accepted and the \c accept() function is invoked.

    \snippet examples/richtext/orderform/detailsdialog.cpp 7

    \section1 MainWindow Definition

    The \c MainWindow class is a subclass of QMainWindow, implementing two

    slots - \c openDialog() and \c printFile(). It also contains a private

    instance of QTabWidget, \c letters.

    \snippet examples/richtext/orderform/mainwindow.h 0

    \section1 MainWindow Implementation

    The \c MainWindow constructor sets up the \c fileMenu and the required

    actions, \c newAction and \c printAction. These actions' \c triggered()

    signals are connected to the additionally implemented openDialog() slot

    and the default close() slot. The QTabWidget, \c letters, is

    instantiated and set as the window's central widget.

    \snippet examples/richtext/orderform/mainwindow.cpp 0

    The \c createLetter() function creates a new QTabWidget with a QTextEdit,

    \c editor, as the parent. This function accepts four parameters that

    correspond to we obtained through \c DetailsDialog, in order to "fill"

    the \c editor.

    \snippet examples/richtext/orderform/mainwindow.cpp 1

    We then obtain the cursor for the \c editor using QTextEdit::textCursor().

    The \c cursor is then moved to the start of the document using

    QTextCursor::Start.

    \snippet examples/richtext/orderform/mainwindow.cpp 2

    Recall the structure of a \l{Rich Text Document Structure}

    {Rich Text Document}, where sequences of frames and

    tables are always separated by text blocks, some of which may contain no

    information.

    In the case of the Order Form Example, the document structure for this portion

    is described by the table below:

    \table

        \row

            \o {1, 8} frame with \e{referenceFrameFormat}

        \row

            \o block \o \c{A company}

        \row

            \o block

        \row

            \o block \o \c{321 City Street}

        \row

            \o block

        \row

            \o block \o \c{Industry Park}

        \row

            \o block

        \row

            \o block \o \c{Another country}

    \endtable

    This is accomplished with the following code:

    \snippet examples/richtext/orderform/mainwindow.cpp 3

    Note that \c topFrame is the \c {editor}'s top-level frame and is not shown

    in the document structure.

    We then set the \c{cursor}'s position back to its last position in

    \c topFrame and fill in the customer's name (provided by the constructor)

    and address - using a \c foreach loop to traverse the QString, \c address.

    \snippet examples/richtext/orderform/mainwindow.cpp 4

    The \c cursor is now back in \c topFrame and the document structure for

    the above portion of code is:

    \table

        \row

            \o block \o \c{Donald}

        \row

            \o block \o \c{47338 Park Avenue}

        \row

            \o block \o \c{Big City}

    \endtable

    For spacing purposes, we invoke \l{QTextCursor::insertBlock()}

    {insertBlock()} twice. The \l{QDate::currentDate()}{currentDate()} is

    obtained and displayed. We use \l{QTextFrameFormat::setWidth()}

    {setWidth()} to increase the width of \c bodyFrameFormat and we insert

    a new frame with that width.

    \snippet examples/richtext/orderform/mainwindow.cpp 5

    The following code inserts standard text into the order form.

    \snippet examples/richtext/orderform/mainwindow.cpp 6

    \snippet examples/richtext/orderform/mainwindow.cpp 7

    This part of the document structure now contains the date, a frame with

    \c bodyFrameFormat, as well as the standard text.

    \table

        \row

            \o block

        \row

            \o block

        \row

            \o block \o \c{Date: 25 May 2007}

        \row

            \o block

        \row

            \o {1, 4} frame with \e{bodyFrameFormat}

        \row

            \o block \o \c{I would like to place an order for the following items:}

        \row

            \o block

        \row

            \o block

    \endtable

    A QTextTableFormat object, \c orderTableFormat, is used to hold the type

    of item and the quantity ordered.

    \snippet examples/richtext/orderform/mainwindow.cpp 8

    We use \l{QTextTable::cellAt()}{cellAt()} to set the headers for the

    \c orderTable.

    \snippet examples/richtext/orderform/mainwindow.cpp 9

    Then, we iterate through the QList of QPair objects to populate

    \c orderTable.

    \snippet examples/richtext/orderform/mainwindow.cpp 10

    The resulting document structure for this section is:

    \table

        \row

            \o {1, 11} \c{orderTable} with \e{orderTableFormat}

        \row

            \o block \o \c{Product}

        \row

            \o block \o \c{Quantity}

        \row

            \o block \o \c{T-shirt}

        \row

            \o block \o \c{4}

        \row

            \o block \o \c{Badge}

        \row

            \o block \o \c{3}

        \row

            \o block \o \c{Reference book}

        \row

            \o block \o \c{2}

        \row

            \o block \o \c{Coffee cup}

        \row

            \o block \o \c{5}

    \endtable

    The \c cursor is then moved back to \c{topFrame}'s

    \l{QTextFrame::lastPosition()}{lastPosition()} and more standard text

    is inserted.

    \snippet examples/richtext/orderform/mainwindow.cpp 11

    \snippet examples/richtext/orderform/mainwindow.cpp 12

    Another QTextTable is inserted, to display the customer's

    preference regarding offers.

    \snippet examples/richtext/orderform/mainwindow.cpp 13

    The document structure for this portion is:

    \table

        \row

            \o block

        \row

            \o block\o \c{Please update my...}

        \row

            \o {1, 5} block

        \row

            \o {1, 4} \c{offersTable}

        \row

            \o block \o \c{I want to receive...}

        \row

            \o block \o \c{I do not want to recieve...}

        \row

            \o block \o \c{X}

    \endtable

    The \c cursor is moved to insert "Sincerely" along with the customer's

    name. More blocks are inserted for spacing purposes. The \c printAction

    is enabled to indicate that an order form can now be printed.

    \snippet examples/richtext/orderform/mainwindow.cpp 14

    The bottom portion of the document structure is:

    \table

        \row

            \o block

        \row

            \o {1, 5} block\o \c{Sincerely,}

        \row

            \o block

        \row

            \o block

        \row

            \o block

        \row

            \o block \o \c{Donald}

    \endtable

    The \c createSample() function is used for illustration purposes, to create

    a sample order form.

    \snippet examples/richtext/orderform/mainwindow.cpp 15

    The \c openDialog() function opens a \c DetailsDialog object. If the

    details in \c dialog are accepted, the \c createLetter() function is

    invoked using the parameters extracted from \c dialog.

    \snippet examples/richtext/orderform/mainwindow.cpp 16

    In order to print out the order form, a \c printFile() function is

    included, as shown below:

    \snippet examples/richtext/orderform/mainwindow.cpp 17

    This function also allows the user to print a selected area with

    QTextCursor::hasSelection(), instead of printing the entire document.

    \section1 \c main() Function

    The \c main() function instantiates \c MainWindow and sets its size to

    640x480 pixels before invoking the \c show() function and

    \c createSample() function.

    \snippet examples/richtext/orderform/main.cpp 0

*/