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 /* Copyright (C) 2006 - 2014 Jan Kundrát <jkt@flaska.net>
 
    This file is part of the Trojita Qt IMAP e-mail client,
    http://trojita.flaska.net/
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 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 14 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 General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 #ifndef EMBEDDEDWEBVIEW_H
 #define EMBEDDEDWEBVIEW_H
 
 #include <QSettings>
 #include <QWebPluginFactory>
 #include <QWebView>
 
 namespace Gui
 {
 
 
 /** @short An embeddable QWebView with some safety checks and modified resizing
 
   This class configures the QWebView in such a way that it will prevent certain
   dangerous (or unexpected, in the context of a MUA) features from being invoked.
 
   Another function is to configure the QWebView in such a way that it resizes
   itself to show all required contents.
 
   Note that you still have to provide a proper eventFilter in the parent widget
   (and register it for use).
 
   @see Gui::MessageView
 
   */
 class EmbeddedWebView: public QWebView
 {
     Q_OBJECT
 public:
     enum class ColorScheme {
         /** @short System's color scheme, but let the content override this */
         System,
         /** @short System's color scheme adjusted towards a compromise for reasonable contrats on funny backgrounds */
         AdjustedSystem,
         /** @short Use boring black-text-on-white-background */
         BlackOnWhite,
     };
 
     EmbeddedWebView(QWidget *parent, QNetworkAccessManager *networkManager, QSettings *profileSettings);
     QSize sizeHint() const;
     QWidget *scrollParent() const;
     void setStaticWidth(int staticWidth);
     int staticWidth() const;
     static std::map<ColorScheme, QString> supportedColorSchemes();
 public slots:
     void changeColorScheme(const ColorScheme colorScheme);
 protected:
     void changeEvent(QEvent *e);
     bool eventFilter(QObject *o, QEvent *e);
     void mouseMoveEvent(QMouseEvent *e);
     void mouseReleaseEvent(QMouseEvent *e);
     void showEvent(QShowEvent *se);
     void addCustomStylesheet(const QString &css);
     void constrainSize();
 private:
     void findScrollParent();
     void loadColorScheme();
     void setColorScheme(const ColorScheme colorScheme);
 private slots:
     void autoScroll();
     void slotLinkClicked(const QUrl &url);
     void handlePageLoadFinished();
 private:
     QWidget *m_scrollParent;
     int m_scrollParentPadding;
     int m_resizeInProgress;
     QTimer *m_autoScrollTimer;
     QTimer *m_sizeContrainTimer;
     int m_autoScrollPixels;
     int m_staticWidth;
     QString m_customCss;
     QSettings *m_settings;
 protected:
     ColorScheme m_colorScheme;
 };
 
 class ErrorCheckingPage: public QWebPage
 {
     Q_OBJECT
 public:
     explicit ErrorCheckingPage(QObject *parent);
 
     virtual bool extension(Extension extension, const ExtensionOption *option, ExtensionReturn *output);
     virtual bool supportsExtension(Extension extension) const;
 };
 
 }
 
 Q_DECLARE_METATYPE(Gui::EmbeddedWebView::ColorScheme)
 
 #endif // EMBEDDEDWEBVIEW_H