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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\example dialogs/tabdialog
\title Tab Dialog Example
\examplecategory {User Interface Components}
\ingroup examples-dialogs
\brief The Tab Dialog example shows how to construct a tab dialog using the
QTabWidget class.
Dialogs provide an efficient way for the application to communicate
with the user, but complex dialogs suffer from the problem that they
often take up too much screen area. By using a number of tabs in a
dialog, information can be split into different categories, while
remaining accessible.
\image tabdialog-example.png
The Tab Dialog example consists of a single \c TabDialog class that
provides three tabs, each containing information about a particular
file, and two standard push buttons that are used to accept or reject
the contents of the dialog.
\section1 TabDialog Class Definition
The \c TabDialog class is a subclass of QDialog that displays a
QTabWidget and two standard dialog buttons. The class definition
only contain the class constructor and a private data member for
the QTabWidget:
\snippet dialogs/tabdialog/tabdialog.h 3
In the example, the widget will be used as a top-level window, but
we define the constructor so that it can take a parent widget. This
allows the dialog to be centered on top of an application's main
window.
\section1 TabDialog Class Implementation
The constructor calls the QDialog constructor and creates a QFileInfo
object for the specified filename.
\snippet dialogs/tabdialog/tabdialog.cpp 0
The tab widget is populated with three custom widgets that each
contain information about the file. We construct each of these
without a parent widget because the tab widget will reparent
them as they are added to it.
We create two standard push buttons, and connect each of them to
the appropriate slots in the dialog:
\snippet dialogs/tabdialog/tabdialog.cpp 1
\snippet dialogs/tabdialog/tabdialog.cpp 3
We arrange the tab widget above the buttons in the dialog:
\snippet dialogs/tabdialog/tabdialog.cpp 4
Finally, we set the dialog's title:
\snippet dialogs/tabdialog/tabdialog.cpp 5
Each of the tabs are subclassed from QWidget, and only provide
constructors.
\section1 GeneralTab Class Definition
The GeneralTab widget definition is simple because we are only interested
in displaying the contents of a widget within a tab:
\snippet dialogs/tabdialog/tabdialog.h 0
\section1 GeneralTab Class Implementation
The GeneralTab widget simply displays some information about the file
passed by the TabDialog. Various widgets for this purpose, and these
are arranged within a vertical layout:
\snippet dialogs/tabdialog/tabdialog.cpp 6
\section1 PermissionsTab Class Definition
Like the GeneralTab, the PermissionsTab is just used as a placeholder
widget for its children:
\snippet dialogs/tabdialog/tabdialog.h 1
\section1 PermissionsTab Class Implementation
The PermissionsTab shows information about the file's access information,
displaying details of the file permissions and owner in widgets that are
arranged in nested layouts:
\snippet dialogs/tabdialog/tabdialog.cpp 7
\section1 ApplicationsTab Class Definition
The ApplicationsTab is another placeholder widget that is mostly
cosmetic:
\snippet dialogs/tabdialog/tabdialog.h 2
\section1 ApplicationsTab Class Implementation
The ApplicationsTab does not show any useful information, but could be
used as a template for a more complicated example:
\snippet dialogs/tabdialog/tabdialog.cpp 8
*/
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