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 /*****************************************************************************
  *   Copyright 2010 Craig Drummond <craig.p.drummond@gmail.com>              *
  *   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 blurhelper_h
 #define blurhelper_h
 
 //////////////////////////////////////////////////////////////////////////////
 // blurhelper.h
 // handle regions passed to kwin for blurring
 // -------------------
 //
 // Copyright (c) 2010 Hugo Pereira Da Costa <hugo@oxygen-icons.org>
 //
 // Loosely inspired (and largely rewritten) from BeSpin style
 // Copyright (C) 2007 Thomas Luebking <thomas.luebking@web.de>
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to
 // deal in the Software without restriction, including without limitation the
 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 // sell copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
 // The above copyright notice and this permission notice shall be included in
 // all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 // IN THE SOFTWARE.
 //////////////////////////////////////////////////////////////////////////////
 
 #include <qtcurve-utils/log.h>
 #include "utils.h"
 
 #include <QPointer>
 #include <QHash>
 #include <QBasicTimer>
 #include <QTimerEvent>
 #include <QDockWidget>
 #include <QMenu>
 #include <QMenuBar>
 #include <QRegion>
 #include <QToolBar>
 
 namespace QtCurve {
 class BlurHelper: public QObject {
     Q_OBJECT
 public:
     // ! constructor
     BlurHelper(QObject*);
 
     // ! enable state
     void
     setEnabled(bool value)
     {
         _enabled = value;
     }
     // ! enabled
     bool
     enabled() const
     {
         return _enabled;
     }
     // ! register widget
     void registerWidget(QWidget*);
     // ! register widget
     void unregisterWidget(QWidget*);
     // ! event filter
     bool eventFilter(QObject*, QEvent*) override;
 protected:
     // ! timer event
     /*! used to perform delayed blur region update of pending widgets */
     void
     timerEvent(QTimerEvent *event) override
     {
         if (event->timerId() == _timer.timerId()) {
             _timer.stop();
             update();
         } else {
             QObject::timerEvent(event);
         }
     }
     // ! get list of blur-behind regions matching a given widget
     QRegion blurRegion(QWidget*) const;
     // ! trim blur region to remove unnecessary areas (recursive)
     void trimBlurRegion(QWidget*, QWidget*, QRegion&) const;
     // ! update blur region for all pending widgets
     /*! a timer is used to allow some buffering of the update requests */
     void
     delayedUpdate()
     {
         if (!_timer.isActive()) {
             _timer.start(10, this);
         }
     }
     // ! update blur region for all pending widgets
     void
     update()
     {
         foreach (const WidgetPointer &widget, const_(_pendingWidgets)) {
             if (widget) {
                 update(widget.data());
             }
         }
         _pendingWidgets.clear();
     }
     // ! update blur regions for given widget
     void update(QWidget*) const;
     // ! clear blur regions for given widget
     void clear(WId) const;
     // ! returns true if a given widget is opaque
     bool
     isOpaque(const QWidget *widget) const
     {
         return (!widget->isWindow()) &&
             ((widget->autoFillBackground() &&
               widget->palette().color(widget->backgroundRole()).alpha() ==
               0xff) || widget->testAttribute(Qt::WA_OpaquePaintEvent));
     }
     // ! true if widget is a transparent window
     /*! some additional checks are performed to make sure stuff like plasma
       tooltips don't get their blur region overwritten */
     inline bool isTransparent(const QWidget *widget) const;
 private:
     // ! enability
     bool _enabled;
     // ! list of widgets for which blur region must be updated
     typedef QPointer<QWidget> WidgetPointer;
     typedef QHash<QWidget*, WidgetPointer> WidgetSet;
     WidgetSet _pendingWidgets;
     // ! delayed update timer
     QBasicTimer _timer;
 };
 bool
 BlurHelper::isTransparent(const QWidget *widget) const
 {
     return (widget->isWindow() &&
             // widgets using qgraphicsview
             !(widget->graphicsProxyWidget() ||
               widget->inherits("Plasma::Dialog")) &&
             // flags and special widgets
             (widget->testAttribute(Qt::WA_StyledBackground) ||
              qobject_cast<const QMenu*>(widget) ||
              // TODO temporary solution only
              widget->inherits("QComboBoxPrivateContainer") ||
              qobject_cast<const QDockWidget*>(widget) ||
              qobject_cast<const QToolBar*>(widget) ||
              // konsole (thought that should be handled
              // internally by the application
              widget->inherits("Konsole::MainWindow")) &&
             Utils::hasAlphaChannel(widget));
 }
 }
 
 #endif