Remove gtk2 style from qtbase, it will be moved to qtstyleplugins

This will allow us to drop gtk2 support from qtbase in future,
while still providing the gtk2 style for those who want to use it.

Also with moving to qtstyleplugins, the code can be simplified
because we can directly link to libraries we need, instead of using
QLibrary.

[ChangeLog][QtWidgets] Remove QGtkStyle, it is now provided in
qtstyleplugins repository.

Change-Id: I6221b1a513d7fda32e080f3ca159b0b2f8a8f246
Reviewed-by: Timo Jyrinki <timo.jyrinki@canonical.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Jens Bache-Wiig <jensbw@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>

3 files changed, 1 insertions, 147 deletions

diff --git a/src/widgets/doc/src/widgets-and-layouts/gallery-gtk.qdoc b/src/widgets/doc/src/widgets-and-layouts/gallery-gtk.qdoc
deleted file mode 100644
index 5c3ae8cb97..0000000000
--- a/src/widgets/doc/src/widgets-and-layouts/gallery-gtk.qdoc
+++ /dev/null
@@ -1,142 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2015 The Qt Company Ltd.
-** Contact: http://www.qt.io/licensing/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see http://www.qt.io/terms-conditions. For further
-** information use the contact form at http://www.qt.io/contact-us.
-**
-** GNU Free Documentation License Usage
-** Alternatively, this file may be used under the terms of the GNU Free
-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file. Please review the following information to ensure
-** the GNU Free Documentation License version 1.3 requirements
-** will be met: http://www.gnu.org/copyleft/fdl.html.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
-  \page gallery-gtk.html
-
-  \title GTK Style Widget Gallery
-  \ingroup gallery
-
-  This page shows some of the widgets available in Qt
-  when configured to use the "gtk" style. This style is
-  only available on desktop environments with GTK runtime
-  support. This style provides native look'n'feel by
-  integrating to the GTK platform theme. Thus, the final
-  appearance varies depending on the active GTK theme.
-
-\section2 Buttons
-
-\table 100%
-\row
-\li \image gtk-pushbutton.png
-   \caption The QPushButton widget provides a command button.
-\li \image gtk-toolbutton.png
-   \caption The QToolButton class provides a quick-access button to commands
-    or options, usually used inside a QToolBar.
-\endtable
-
-\table 100%
-\row
-\li \image gtk-checkbox.png
-   \caption The QCheckBox widget provides a checkbox with a text label.
-\li \image gtk-radiobutton.png
-   \caption The QRadioButton widget provides a radio button with a text or pixmap label.
-\endtable
-
-\section2 Containers
-
-\table 100%
-\row
-\li \image gtk-groupbox.png
-   The QGroupBox widget provides a group box frame with a title.
-\li \image gtk-tabwidget.png
-   The QTabWidget class provides a stack of tabbed widgets.
-\li \image gtk-frame.png
-   The QFrame widget provides a simple decorated container for other widgets.
-\li \image gtk-toolbox.png
-   The QToolBox class provides a column of tabbed widget items.
-\endtable
-
-\section2 Item Views
-
-\table 100%
-\row
-\li \image gtk-listview.png
-   The QListView class provides a default model/view implementation of a list/icon view. The QListWidget class provides a classic item-based list/icon view.
-\li \image gtk-treeview.png
-   The QTreeView class provides a default model/view implementation of a tree view. The QTreeWidget class provides a classic item-based tree view.
-\li \image gtk-tableview.png
-   The QTableView class provides a default model/view implementation of a table view. The QTableWidget class provides a classic item-based table view.\li
-\li
-\endtable
-
-\section2 Display Widgets
-
-\table 100%
-\row
-\li \image gtk-progressbar.png
-   The QProgressBar widget provides a horizontal progress bar.
-\li \image gtk-label.png
-   The QLabel widget provides a text or image display.
-\li \image gtk-lcdnumber.png
-   The QLCDNumber widget displays a number with LCD-like digits.
-\endtable
-
-\section2 Input Widgets
-
-\table 100%
-\row
-\li \image gtk-lineedit.png
-   The QLineEdit widget is a one-line text editor.
-\li \image gtk-dateedit.png
-   The QDateEdit class provides a widget for editing dates.
-\li \image gtk-timeedit.png
-   The QTimeEdit class provides a widget for editing times.
-\li \image gtk-datetimeedit.png
-   The QDateTimeEdit class provides a widget for editing dates and times.
-\endtable
-
-\table 100%
-\row
-\li \image gtk-slider.png
-   The QSlider widget provides a vertical or horizontal slider.
-\li \image gtk-combobox.png
-   The QComboBox widget is a combined button and pop-up list.
-\li \image gtk-spinbox.png
-   The QSpinBox class provides a spin box widget.
-\endtable
-
-\table 100%
-\row
-\li \image gtk-fontcombobox.png
-   The QFontComboBox widget is a specialized combobox that enables fonts to be selected from a pop-up list containing previews of available fonts.
-\li \image gtk-doublespinbox.png
-   The QDoubleSpinBox class provides a spin box widget that allows double precision floating point numbers to be entered.
-\li \image gtk-horizontalscrollbar.png
-   The QScrollBar widget provides a vertical or horizontal scroll bar. Here, we show a scroll bar with horizontal orientation.
-\endtable
-
-\table 100%
-\row
-\li \image gtk-dial.png
-   The QDial class provides a rounded range control (like a speedometer or potentiometer).
-\li \image gtk-textedit.png
-   The QTextEdit class provides a widget that is used to edit and display both plain and rich text.
-\li \image gtk-calendarwidget.png
-   The QCalendarWidget class provides a monthly calendar widget that can be used to select dates.
-\endtable
-*/
diff --git a/src/widgets/doc/src/widgets-and-layouts/gallery.qdoc b/src/widgets/doc/src/widgets-and-layouts/gallery.qdoc
index cc6446b8a5..c32eceb558 100644
--- a/src/widgets/doc/src/widgets-and-layouts/gallery.qdoc
+++ b/src/widgets/doc/src/widgets-and-layouts/gallery.qdoc
@@ -54,10 +54,6 @@
   \caption \l{Macintosh Style Widget Gallery}
 
   The Macintosh style is provided by QMacStyle.
-  \li \image gtk-tabwidget.png GTK Style Widget Gallery
-  \caption \l{GTK Style Widget Gallery}
-
-  The GTK style is provided by QGtkStyle.
   \li \image fusion-tabwidget.png Fusion Style Widget Gallery
   \caption \l{Fusion Style Widget Gallery}
 
diff --git a/src/widgets/doc/src/widgets-and-layouts/styles.qdoc b/src/widgets/doc/src/widgets-and-layouts/styles.qdoc
index 0a5a079969..74a5ce3189 100644
--- a/src/widgets/doc/src/widgets-and-layouts/styles.qdoc
+++ b/src/widgets/doc/src/widgets-and-layouts/styles.qdoc
@@ -38,7 +38,7 @@
     native widgets.
 
     Qt comes with a selection of built-in styles. Some styles are only
-    available on specific platforms (such as the Mac, GTK+ and Windows
+    available on specific platforms (such as the Mac and Windows
     Vista styles). Custom styles are made available as plugins or by
     creating an instance of a specific style class with
     QStyleFactory::create() and setting it with QApplication::setStyle().