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 /*****************************************************************************
  *   Copyright 2013 - 2015 Yichao Yu <yyc1992@gmail.com>                     *
  *                                                                           *
  *   This program is free software; you can redistribute it and/or modify    *
  *   it under the terms of the GNU Lesser General Public License as          *
  *   published by the Free Software Foundation; either version 2.1 of the    *
  *   License, or (at your option) version 3, or any later version accepted   *
  *   by the membership of KDE e.V. (or its successor approved by the         *
  *   membership of KDE e.V.), which shall act as a proxy defined in          *
  *   Section 6 of version 3 of the license.                                  *
  *                                                                           *
  *   This program is distributed in the hope that it will be useful,         *
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
  *   Lesser General Public License for more details.                         *
  *                                                                           *
  *   You should have received a copy of the GNU Lesser General Public        *
  *   License along with this library. If not,                                *
  *   see <http://www.gnu.org/licenses/>.                                     *
  *****************************************************************************/
 
 #ifndef __QTC_UTILS_QT_PROPS_H__
 #define __QTC_UTILS_QT_PROPS_H__
 
 #include "qtutils.h"
 #include <QSharedPointer>
 #include <QVariant>
 #include <QMdiSubWindow>
 
 namespace QtCurve {
 
 struct _QtcQWidgetProps {
     _QtcQWidgetProps():
         opacity(100),
 #if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
         prePolishing(false),
 #else
         prePolished(false),
         prePolishStarted(false),
 #endif
         shadowRegistered(false),
         noEtch(false)
     {
     }
     int opacity;
 #if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
     bool prePolishing: 1;
 #else
     bool prePolished: 1;
     bool prePolishStarted: 1;
 #endif
     bool shadowRegistered: 1;
     // OK, Etching looks cr*p on plasma widgets, and khtml...
     // CPD:TODO WebKit?
     bool noEtch: 1;
 };
 
 #define QTC_PROP_NAME "_q__QTCURVE_WIDGET_PROPERTIES__"
 
 class QtcQWidgetProps {
     typedef QSharedPointer<_QtcQWidgetProps> prop_type;
     inline prop_type
     getProps() const
     {
         // use _q_ to mimic qt internal properties and suppress QtDesigner
         // warning about unsupported properties.
         QVariant val(m_w->property(QTC_PROP_NAME));
         if (!val.isValid()) {
             val = QVariant::fromValue(QSharedPointer<_QtcQWidgetProps>(
                                           new _QtcQWidgetProps));
             const_cast<QWidget*>(m_w)->setProperty(QTC_PROP_NAME, val);
         }
         return val.value<prop_type>();
     }
 public:
     QtcQWidgetProps(const QWidget *widget): m_w(widget), m_p(0) {}
     inline _QtcQWidgetProps*
     operator->() const
     {
         if (!m_p && m_w) {
             m_p = getProps();
         }
         return m_p.data();
     }
 private:
     const QWidget *m_w;
     mutable prop_type m_p;
 };
 
 static inline int
 qtcGetOpacity(const QWidget *widget)
 {
     for (const QWidget *w = widget;w;w = w->parentWidget()) {
         QtcQWidgetProps props(w);
         if (qobject_cast<const QMdiSubWindow*>(w)) {
             // don't use opacity on QMdiSubWindow menu for now, as it will
             // draw through the background as well.
             return 100;
         }
         if (props->opacity < 100) {
             return props->opacity;
         }
         if (w->isWindow()) {
             break;
         }
     }
     return 100;
 }
 
 }
 
 Q_DECLARE_METATYPE(QSharedPointer<QtCurve::_QtcQWidgetProps>)
 
 #endif