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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.
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+** GNU General Public License Usage
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+****************************************************************************/
+
+/*!
+    \example widgets/lineedits
+    \title Line Edits Example
+
+    The Line Edits example demonstrates the many ways that QLineEdit can be used, and
+    shows the effects of various properties and validators on the input and output
+    supplied by the user.
+
+    \image lineedits-example.png
+
+    The example consists of a single \c Window class, containing a selection of
+    line edits with different input constraints and display properties that can be
+    changed by selecting items from comboboxes. Presenting these together helps
+    developers choose suitable properties to use with line edits, and makes it easy
+    to compare the effects of each validator on user input.
+
+    \section1 Window Class Definition
+
+    The \c Window class inherits QWidget and contains a constructor and several
+    slots:
+
+    \snippet examples/widgets/lineedits/window.h 0
+
+    The slots are used to update the type of validator used for a given line edit when
+    a new validator has been selected in the associated combobox. The line edits
+    are stored in the window for use in these slots.
+
+    \section1 Window Class Implementation
+
+    The \c Window constructor is used to set up the line edits, validators,
+    and comboboxes, connect signals from the comboboxes to slots in the \c Window
+    class, and arrange the child widgets in layouts.
+
+    We begin by constructing a \l{QGroupBox}{group box} to hold a label, combobox,
+    and line edit so that we can demonstrate the QLineEdit::echoMode property:
+
+    \snippet examples/widgets/lineedits/window.cpp 0
+
+    At this point, none of these widgets have been arranged in layouts. Eventually,
+    the \c echoLabel, \c echoComboBox, and \c echoLineEdit will be placed in a
+    vertical layout inside the \c echoGroup group box.
+
+    Similarly, we construct group boxes and collections of widgets to show the
+    effects of QIntValidator and QDoubleValidator on a line edit's contents:
+
+    \snippet examples/widgets/lineedits/window.cpp 1
+
+    Text alignment is demonstrated by another group of widgets:
+
+    \snippet examples/widgets/lineedits/window.cpp 2
+
+    QLineEdit supports the use of \l{QLineEdit::inputMask}{input masks}.
+    These only allow the user to type characters into the line edit that
+    follow a simple specification. We construct a group of widgets to
+    demonstrate a selection of predefined masks:
+
+    \snippet examples/widgets/lineedits/window.cpp 3
+
+    Another useful feature of QLineEdit is its ability to make its contents
+    read-only. This property is used to control access to a line edit in the
+    following group of widgets:
+
+    \snippet examples/widgets/lineedits/window.cpp 4
+
+    Now that all the child widgets have been constructed, we connect signals
+    from the comboboxes to slots in the \c Window object:
+
+    \snippet examples/widgets/lineedits/window.cpp 5
+
+    Each of these connections use the QComboBox::activated() signal that
+    supplies an integer to the slot. This will be used to efficiently
+    make changes to the appropriate line edit in each slot.
+
+    We place each combobox, line edit, and label in a layout for each group
+    box, beginning with the layout for the \c echoGroup group box:
+
+    \snippet examples/widgets/lineedits/window.cpp 6
+
+    The other layouts are constructed in the same way:
+
+    \snippet examples/widgets/lineedits/window.cpp 7
+
+    Finally, we place each group box in a grid layout for the \c Window object
+    and set the window title:
+
+    \snippet examples/widgets/lineedits/window.cpp 8
+
+    The slots respond to signals emitted when the comboboxes are changed by the
+    user.
+
+    When the combobox for the \gui{Echo} group box is changed, the \c echoChanged()
+    slot is called:
+
+    \snippet examples/widgets/lineedits/window.cpp 9
+
+    The slot updates the line edit in the same group box to use an echo mode that
+    corresponds to the entry described in the combobox.
+
+    When the combobox for the \gui{Validator} group box is changed, the
+    \c validatorChanged() slot is called:
+
+    \snippet examples/widgets/lineedits/window.cpp 10
+
+    The slot either creates a new validator for the line edit to use, or it removes
+    the validator in use by calling QLineEdit::setValidator() with a zero pointer.
+    We clear the line edit in this case to ensure that the new validator is
+    initially given valid input to work with.
+
+    When the combobox for the \gui{Alignment} group box is changed, the
+    \c alignmentChanged() slot is called:
+
+    \snippet examples/widgets/lineedits/window.cpp 11
+
+    This changes the way that text is displayed in the line edit to correspond with
+    the description selected in the combobox.
+
+    The \c inputMaskChanged() slot handles changes to the combobox in the
+    \gui{Input Mask} group box:
+
+    \snippet examples/widgets/lineedits/window.cpp 12
+
+    Each entry in the relevant combobox is associated with an input mask. We set
+    a new mask by calling the QLineEdit::setMask() function with a suitable string;
+    the mask is disabled if an empty string is used.
+
+    The \c accessChanged() slot handles changes to the combobox in the
+    \gui{Access} group box:
+
+    \snippet examples/widgets/lineedits/window.cpp 13
+
+    Here, we simply associate the \gui{False} and \gui{True} entries in the combobox
+    with \c false and \c true values to be passed to QLineEdit::setReadOnly(). This
+    allows the user to enable and disable input to the line edit.
+*/