Warning, file /system/qtcurve/qt4/style/shadowhelper.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*****************************************************************************
  *   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/>.                                     *
  *****************************************************************************/
 
 //////////////////////////////////////////////////////////////////////////////
 // shadowhelper.h
 // handle shadow _pixmaps passed to window manager via X property
 // -------------------
 //
 // Copyright (c) 2010 Hugo Pereira Da Costa <hugo@oxygen-icons.org>
 //
 // 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 "shadowhelper.h"
 #include "utils.h"
 
 #include <QDockWidget>
 #include <QMenu>
 #include <QPainter>
 #include <QToolBar>
 #include <QEvent>
 
 #include <qtcurve-utils/x11shadow.h>
 #include <qtcurve-utils/qtprops.h>
 
 namespace QtCurve {
 const char *const ShadowHelper::netWMForceShadowPropertyName =
     "_KDE_NET_WM_FORCE_SHADOW";
 const char *const ShadowHelper::netWMSkipShadowPropertyName =
     "_KDE_NET_WM_SKIP_SHADOW";
 
 bool
 ShadowHelper::registerWidget(QWidget *widget, bool force)
 {
     QtcQWidgetProps props(widget);
     // make sure widget is not already registered
     if (props->shadowRegistered)
         return false;
     // check if widget qualifies
     if (!(force || acceptWidget(widget)))
         return false;
     props->shadowRegistered = true;
 
     // WinIdChange Event
     widget->installEventFilter(this);
     installX11Shadows(widget);
     return true;
 }
 
 void
 ShadowHelper::unregisterWidget(QWidget *widget)
 {
     QtcQWidgetProps props(widget);
     if (props->shadowRegistered) {
         uninstallX11Shadows(widget);
         props->shadowRegistered = false;
     }
 }
 
 bool
 ShadowHelper::eventFilter(QObject *object, QEvent *event)
 {
     if (event->type() == QEvent::WinIdChange)
         installX11Shadows(static_cast<QWidget*>(object));
     return false;
 }
 
 bool
 ShadowHelper::acceptWidget(QWidget *widget) const
 {
     if (widget->property(netWMSkipShadowPropertyName).toBool())
         return false;
     if (widget->property(netWMForceShadowPropertyName).toBool())
         return true;
 
     // menus
     if (qobject_cast<QMenu*>(widget))
         return true;
 
     // combobox dropdown lists
     if (widget->inherits("QComboBoxPrivateContainer"))
         return true;
 
     // tooltips
     if ((widget->windowType() == Qt::ToolTip ||
          widget->inherits("QTipLabel")) && !widget->inherits("Plasma::ToolTip"))
         return true;
 
     // detached widgets
     if (qobject_cast<QToolBar*>(widget) || qobject_cast<QDockWidget*>(widget))
         return true;
 
     // Fix Lancelot main menu shadow. Somehow they sets the override the
     // shadow of the main menu to nothing instead of the plasma one.
     // Maybe I should submit a patch for lancelot later instead.
     if (widget->inherits("LancelotWindow"))
         return true;
 
     // reject
     return false;
 }
 
 bool
 ShadowHelper::installX11Shadows(QWidget *widget)
 {
     // DO NOT condition compile on QTC_ENABLE_X11.
     // There's no direct linkage on X11 and the following code will just do
     // nothing if X11 is not enabled (either at compile time or at run time).
     QTC_RET_IF_FAIL(qtcX11Enabled(), false);
     if (WId wid = qtcGetWid(widget)) {
         if (widget->windowType() == Qt::ToolTip &&
             widget->inherits("QBalloonTip")) {
             bool atTop = true;
             int margin = qtcGetBalloonMargin(widget, &atTop);
             int margins[4] = {0, 0, 0, 0};
             // KWin's shadows margin order is top, right, bottom, left..
             margins[atTop ? 0 : 2] = margin;
             qtcX11ShadowInstall(wid, margins);
         } else {
             qtcX11ShadowInstall(wid);
         }
         return true;
     }
     return false;
 }
 
 void
 ShadowHelper::uninstallX11Shadows(QWidget *widget) const
 {
     // DO NOT condition compile on QTC_ENABLE_X11.
     // There's no direct linkage on X11 and the following code will just do
     // nothing if X11 is not enabled (either at compile time or at run time).
     QTC_RET_IF_FAIL(qtcX11Enabled());
     if (WId wid = qtcGetWid(widget)) {
         qtcX11ShadowUninstall(wid);
     }
 }
 }