QY2Styler.h

/*
  Copyright (C) 2000-2012 Novell, Inc
  This library 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 3.0 of the License. This library
  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, write
  to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
  Floor, Boston, MA 02110-1301 USA
*/


/*-/

  File:     QY2Styler.h

  Author:   Stefan Kulow <coolo@suse.de>

/-*/


#ifndef QY2Styler_h
#define QY2Styler_h

#include <QObject>
#include <QHash>
#include <QString>
#include <QImage>
#include <QMap>

#define HIGH_CONTRAST_STYLE_SHEET "highcontrast.qss"
#define DEFAULT_STYLE_SHEET "style.qss"

class QY2Styler : public QObject
{
    Q_OBJECT

protected:

    QY2Styler( QObject * parent,
               const QString & defaultStyleSheet = "",
               const QString & alternateStyleSheet = "" );

public:

    static QY2Styler * styler();

    bool styleSheetExists( const QString & file );

    bool loadStyleSheet( const QString &file );

    void setStyleSheet( const QString & text );

    bool loadDefaultStyleSheet();

    bool loadAlternateStyleSheet();

    QString themeDir() const;

    void registerWidget( QWidget *widget );

    void unregisterWidget( QWidget *widget );


    void registerChildWidget( QWidget *parent, QWidget *widget );

    QString textStyle() const { return _textStyle; }

    void setDefaultStyleSheet(const QString & styleSheet);

    void setAlternateStyleSheet(const QString & styleSheet);

    void toggleAlternateStyleSheet();

    bool usingAlternateStyleSheet() { return _usingAlternateStyleSheet; }

    bool updateRendering( QWidget *wid );

protected:
    void renderParent( QWidget *wid );
    QImage getScaled( const QString name, const QSize & size );

    void processUrls( QString & text );

    const QString buildStyleSheet(QString content);

    const QString buildStyleSheet(QString content, QStringList & alreadyImportedFilenames);

    const QString buildStyleSheetFromFile(const QString & filename, QStringList & alreadyImportedFilenames);

    /*
     * Reimplemented from QObject.
     **/
    bool eventFilter( QObject * obj, QEvent * ev );

    QString _currentStyleSheet;
    QString _defaultStyleSheet = DEFAULT_STYLE_SHEET;
    QString _alternateStyleSheet = HIGH_CONTRAST_STYLE_SHEET;
    bool _usingAlternateStyleSheet = false;

private:

    struct BackgrInfo
    {
    QString filename;
    QImage pix;
        QImage scaled;
        QSize lastscale;
    bool full;
    };

    QHash<QString,BackgrInfo> _backgrounds;
    QMap<QWidget*, QList< QWidget* > > _children;
    // remember all registered widgets to allow styling not only for
    // the explicitly requested children widgets (stored in _children)
    QList< QWidget* > _registered_widgets;
    QString _style;
    QString _textStyle;
};


#endif // QY2Styler_h