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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
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****************************************************************************/
/*!
\example dialogs/sipdialog
\title SIP Dialog Example
\ingroup qtce
\brief The SIP Dialog example shows how to create a dialog that is aware of
the Windows Mobile SIP (Software Input Panel) and reacts to it.
\table
\row \li \inlineimage sipdialog-closed.png
\li \inlineimage sipdialog-opened.png
\endtable
Sometimes it is necessary for a dialog to take the SIP into account,
as the SIP may hide important input widgets. The SIP Dialog Example
shows how a \c Dialog object, \c dialog, can be resized accordingly
if the SIP is opened, by embedding the contents of \c dialog in a
QScrollArea.
\section1 Dialog Class Definition
The \c Dialog class is a subclass of QDialog that implements a public
slot, \c desktopResized(), and a public function, \c reactToSIP(). Also,
it holds a private instance of QRect, \c desktopGeometry.
\snippet dialogs/sipdialog/dialog.h Dialog header
\section1 Dialog Class Implementation
In the constructor of \c Dialog, we start by obtaining the
available geometry of the screen with
\l{QDesktopWidget::availableGeometry()}{availableGeometry()}. The
parameter used is \c 0 to indicate that we require the primary screen.
\snippet dialogs/sipdialog/dialog.cpp Dialog constructor part1
We set the window's title to "SIP Dialog Example" and declare a QScrollArea
object, \c scrollArea. Next we instantiate a QGroupBox, \c groupBox, with
\c scrollArea as its parent. The title of \c groupBox is also set to
"SIP Dialog Example". A QGridLayout object, \c gridLayout, is then used
as \c{groupBox}'s layout.
We create a QLineEdit, a QLabel and a QPushButton and we set the
\l{QWidget::setMinimumWidth()}{minimumWidth} property to 220 pixels,
respectively.
\snippet dialogs/sipdialog/dialog.cpp Dialog constructor part2
Also, all three widgets' text are set accordingly. The
\l{QGridLayout::setVerticalSpacing()}{verticalSpacing} property of
\c gridLayout is set based on the height of \c desktopGeometry. This
is to adapt to the different form factors of Windows Mobile. Then, we
add our widgets to the layout.
\snippet dialogs/sipdialog/dialog.cpp Dialog constructor part3
The \c{scrollArea}'s widget is set to \c groupBox. We use a QHBoxLayout
object, \c layout, to contain \c scrollArea. The \c{Dialog}'s layout
is set to \c layout and the scroll area's horizontal scroll bar is turned
off.
\snippet dialogs/sipdialog/dialog.cpp Dialog constructor part4
The following signals are connected to their respective slots:
\list
\li \c{button}'s \l{QPushButton::pressed()}{pressed()} signal to
\l{QApplication}'s \l{QApplication::closeAllWindows()}
{closeAllWindows()} slot,
\li \l{QDesktopWidget}'s \l{QDesktopWidget::workAreaResized()}
{workAreaResized()} signal to \c{dialog}'s \c desktopResized() slot.
\endlist
\snippet dialogs/sipdialog/dialog.cpp Dialog constructor part5
The \c desktopResized() function accepts an integer, \a screen,
corresponding to the screen's index. We only invoke \c reactToSIP()
if \a screen is the primary screen (e.g. index = 0).
\snippet dialogs/sipdialog/dialog.cpp desktopResized() function
The \c reactToSIP() function resizes \c dialog accordingly if the
desktop's available geometry changed vertically, as this change signifies
that the SIP may have been opened or closed.
\snippet dialogs/sipdialog/dialog.cpp reactToSIP() function
If the height has decreased, we unset the maximized window state.
Otherwise, we set the maximized window state. Lastly, we update
\c desktopGeometry to the desktop's available geometry.
\section1 The \c main() function
The \c main() function for the SIP Dialog example instantiates \c Dialog
and invokes its \l{QDialog::exec()}{exec()} function.
\snippet dialogs/sipdialog/main.cpp main() function
\note Although this example uses a dialog, the techniques used here apply to
all top-level widgets respectively.
*/
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