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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/>.                                     *
  *****************************************************************************/
 
 //////////////////////////////////////////////////////////////////////////////
 // qtcurvesizegrip.cpp
 // -------------------
 //
 // Taken from Oxygen kwin decoration
 // ------------
 //
 // Copyright (c) 2009 Hugo Pereira Da Costa <hugo.pereira@free.fr>
 //
 // 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/x11wrap.h>
 #include <qtcurve-utils/x11utils.h>
 
 #include "qtcurvesizegrip.h"
 #include "qtcurvebutton.h"
 #include "qtcurveclient.h"
 
 #include <cassert>
 #include <QPainter>
 #include <QPolygon>
 #include <QTimer>
 
 namespace QtCurve {
 namespace KWin {
 
 static inline bool
 similar(const QColor &a, const QColor &b)
 {
     static const int diff = 18;
     return (abs(a.red() - b.red()) < diff &&
             abs(a.green() - b.green()) < diff &&
             abs(a.blue() - b.blue()) < diff);
 }
 
 QtCurveSizeGrip::QtCurveSizeGrip(QtCurveClient* client):
     QWidget(0),
     client_(client)
 {
     setAttribute(Qt::WA_NoSystemBackground );
     setAutoFillBackground(false);
 
     // cursor
     setCursor(Qt::SizeFDiagCursor);
 
     // size
     setFixedSize(QSize(GRIP_SIZE, GRIP_SIZE));
 
     // mask
     QPolygon p;
     p << QPoint(0, GRIP_SIZE)
       << QPoint(GRIP_SIZE, 0)
       << QPoint(GRIP_SIZE, GRIP_SIZE)
       << QPoint(0, GRIP_SIZE);
 
     setMask(QRegion(p));
 
     // embed
     embed();
     updatePosition();
 
     // event filter
     client->widget()->installEventFilter(this);
 
     // show
     show();
 }
 
 QtCurveSizeGrip::~QtCurveSizeGrip()
 {
 }
 
 void
 QtCurveSizeGrip::activeChange()
 {
     qtcX11MapRaised(winId());
 }
 
 void
 QtCurveSizeGrip::embed()
 {
     WId window_id = client().windowId();
     if (client().isPreview()) {
         setParent(client().widget());
     } else if (window_id) {
         WId current = window_id;
         while (true) {
             auto reply = qtcX11QueryTree(current);
             if (reply && reply->parent && reply->parent != reply->root &&
                 reply->parent != current) {
                 current = reply->parent;
             } else {
                 free(reply);
                 break;
             }
             free(reply);
         }
         qtcX11ReparentWindow(winId(), current, 0, 0);
         qtcX11Flush();
     } else {
         hide();
     }
 }
 
 bool
 QtCurveSizeGrip::eventFilter(QObject *object, QEvent *event)
 {
 
     if (object != client().widget())
         return false;
     if (event->type() == QEvent::Resize)
         updatePosition();
     return false;
 }
 
 void
 QtCurveSizeGrip::paintEvent(QPaintEvent*)
 {
     // get relevant colors
     QColor base(KDecoration::options()->color(KDecoration::ColorTitleBar,
                                               client().isActive()));
     // QColor light(client().helper().calcDarkColor(base));
     // QColor dark(client().helper().calcDarkColor(base.darker(150)));
 
     if (similar(base, client().widget()->palette().color(backgroundRole())))
         base = base.value() > 100 ? base.dark(120) : base.light(120);
 
     // create and configure painter
     QPainter painter(this);
     // painter.setRenderHints(QPainter::Antialiasing);
 
     painter.setPen(Qt::NoPen);
     painter.setBrush(base);
 
     // polygon
     QPolygon p;
     p << QPoint(0, GRIP_SIZE)
       << QPoint(GRIP_SIZE, 0)
       << QPoint(GRIP_SIZE, GRIP_SIZE)
       << QPoint(0, GRIP_SIZE);
     painter.drawPolygon(p);
 
     // // diagonal border
     // painter.setBrush(Qt::NoBrush);
     // painter.setPen(QPen(dark, 3));
     // painter.drawLine(QPoint(0, GRIP_SIZE), QPoint(GRIP_SIZE, 0));
 
     // // side borders
     // painter.setPen(QPen(light, 1.5));
     // painter.drawLine(QPoint(1, GRIP_SIZE), QPoint(GRIP_SIZE, GRIP_SIZE));
     // painter.drawLine(QPoint(GRIP_SIZE, 1), QPoint(GRIP_SIZE, GRIP_SIZE));
     // painter.end();
 }
 
 void
 QtCurveSizeGrip::mousePressEvent(QMouseEvent *event)
 {
     switch (event->button()) {
     case Qt::RightButton:
         hide();
         QTimer::singleShot(5000, this, SLOT(show()));
         break;
     case Qt::MidButton:
         hide();
         break;
     case Qt::LeftButton:
       if (rect().contains(event->pos())) {
           // check client window id
           if (!client().windowId())
               break;
           client().widget()->setFocus();
           if (client().decoration()) {
               client().decoration()->performWindowOperation(
                   KDecorationDefines::ResizeOp);
           }
       }
       break;
     default:
         break;
     }
     return;
 }
 
 void
 QtCurveSizeGrip::updatePosition()
 {
     QPoint position(client().width() - GRIP_SIZE - OFFSET,
                     client().height() - GRIP_SIZE - OFFSET);
     if (client().isPreview()) {
       position -= QPoint(
         client().layoutMetric(QtCurveClient::LM_BorderRight) +
         client().layoutMetric(QtCurveClient::LM_OuterPaddingRight),
         client().layoutMetric(QtCurveClient::LM_OuterPaddingBottom) +
         client().layoutMetric(QtCurveClient::LM_BorderBottom));
     } else {
         position -= QPoint(
             client().layoutMetric(QtCurveClient::LM_BorderRight),
             client().layoutMetric(QtCurveClient::LM_BorderBottom));
     }
     move(position);
 }
 
 }
 }