Add palette() and further hints to QtGui/QPlatformTheme.

- Move palette() from deprecated QtWidgets/QGuiPlatformPlugin
  to  QtGui/QPlatformTheme, Make it return a const * since
  QPalette does not have isNull().
- Initialize QGuiApplication::palette() and
  QApplication::systemPalette() from it.
- Do not initialize QPalette from QGuiApplication::palette()
  unless app_pal is non-null (default to Qt::black if it is 0).
  This avoids initialization order crashes/recursions in the
  QPA plugin. Streamline initialization function.
- Remove styleName(), systemIconThemeName() and iconSearchPaths()
  from QGuiPlatformPlugin and re-add them as
  QPlatformTheme::themeHint().
- Remove styleHint() from QGuiPlatformPlugin, add it to
  QPlatformTheme::themeHint().
- Add UNIX themes with factory function (Generic,
  KDE, Gnome), taking it from Qt 4.8 code (stripping the
  KDE 3 code).
- Implement Windows palettes.

Task-number: QTBUG-24204

Change-Id: Ie27ec035df4f84c42deaffc4816b2e53ce705462
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h b/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
new file mode 100644
index 0000000000..12937a205f
--- /dev/null
+++ b/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
@@ -0,0 +1,106 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGENERICUNIXTHEMES_H
+#define QGENERICUNIXTHEMES_H
+
+#include <QtGui/QPlatformTheme>
+#include <QtCore/QString>
+#include <QtCore/QStringList>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QGenericUnixTheme : public QPlatformTheme
+{
+public:
+    QGenericUnixTheme() {}
+
+    static QPlatformTheme *createUnixTheme();
+
+    virtual QVariant themeHint(ThemeHint hint) const;
+
+    static QStringList xdgIconThemePaths();
+};
+
+class QKdeTheme : public QPlatformTheme
+{
+    QKdeTheme(const QString &kdeHome, int kdeVersion);
+public:
+    ~QKdeTheme() { clearPalettes(); }
+
+    static QPlatformTheme *createKdeTheme();
+    virtual QVariant themeHint(ThemeHint hint) const;
+    virtual const QPalette *palette(Palette type = SystemPalette) const
+        { return m_palettes[type]; }
+
+private:
+    QString globalSettingsFile() const;
+    void clearPalettes();
+    void refresh();
+
+    const QString m_kdeHome;
+    const int m_kdeVersion;
+    QPalette *m_palettes[NPalettes];
+    QString m_iconThemeName;
+    QString m_iconFallbackThemeName;
+    QStringList m_styleNames;
+    int m_toolButtonStyle;
+    int m_toolBarIconSize;
+};
+
+class QGnomeTheme : public QPlatformTheme
+{
+public:
+    QGnomeTheme() {}
+    virtual QVariant themeHint(ThemeHint hint) const;
+
+private:
+};
+
+QPlatformTheme *qt_createUnixTheme();
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QGENERICUNIXTHEMES_H