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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QQUICKTEXT_P_P_H
#define QQUICKTEXT_P_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qquicktext_p.h"
#include "qquickimplicitsizeitem_p_p.h"

#include <QtQml/qqml.h>
#include <QtGui/qabstracttextdocumentlayout.h>
#include <QtGui/qtextlayout.h>
#include <private/qquickstyledtext_p.h>
#include <private/qlazilyallocated_p.h>

QT_BEGIN_NAMESPACE

class QTextLayout;
class QQuickTextDocumentWithImageResources;

class Q_AUTOTEST_EXPORT QQuickTextPrivate : public QQuickImplicitSizeItemPrivate
{
    Q_DECLARE_PUBLIC(QQuickText)
public:
    QQuickTextPrivate();
    ~QQuickTextPrivate();
    void init();

    void updateBaseline(qreal baseline, qreal dy);
    void updateSize();
    void updateLayout();
    bool determineHorizontalAlignment();
    bool setHAlign(QQuickText::HAlignment, bool forceAlign = false);
    void mirrorChange();
    bool isLineLaidOutConnected();
    void setLineGeometry(QTextLine &line, qreal lineWidth, qreal &height);

    QString elidedText(qreal lineWidth, const QTextLine &line, QTextLine *nextLine = 0) const;
    void elideFormats(int start, int length, int offset, QList<QTextLayout::FormatRange> *elidedFormats);

    void processHoverEvent(QHoverEvent *event);

    QRectF layedOutTextRect;

    struct ExtraData {
        ExtraData();

        qreal lineHeight;
        QQuickTextDocumentWithImageResources *doc;
        QString activeLink;
        QString hoveredLink;
        int minimumPixelSize;
        int minimumPointSize;
        int nbActiveDownloads;
        int maximumLineCount;
        QQuickText::LineHeightMode lineHeightMode;
        QQuickText::FontSizeMode fontSizeMode;
    };
    QLazilyAllocated<ExtraData> extra;

    QString text;
    QUrl baseUrl;
    QFont font;
    QFont sourceFont;
    QList<QQuickStyledTextImgTag*> imgTags;
    QList<QQuickStyledTextImgTag*> visibleImgTags;

    QTextLayout layout;
    QTextLayout *elideLayout;
    QQuickTextLine *textLine;

    qreal lineWidth;

    QRgb color;
    QRgb linkColor;
    QRgb styleColor;

    int lineCount;
    int multilengthEos;

    enum UpdateType {
        UpdateNone,
        UpdatePreprocess,
        UpdatePaintNode
    };

    QQuickText::TextElideMode elideMode;
    QQuickText::HAlignment hAlign;
    QQuickText::VAlignment vAlign;
    QQuickText::TextFormat format;
    QQuickText::WrapMode wrapMode;
    QQuickText::TextStyle style;
    QQuickText::RenderType renderType;
    UpdateType updateType;

    bool maximumLineCountValid:1;
    bool updateOnComponentComplete:1;
    bool richText:1;
    bool styledText:1;
    bool widthExceeded:1;
    bool heightExceeded:1;
    bool internalWidthUpdate:1;
    bool requireImplicitSize:1;
    bool implicitWidthValid:1;
    bool implicitHeightValid:1;
    bool truncated:1;
    bool hAlignImplicit:1;
    bool rightToLeftText:1;
    bool layoutTextElided:1;
    bool textHasChanged:1;
    bool needToUpdateLayout:1;
    bool formatModifiesFontSize:1;

    static const QChar elideChar;

    virtual qreal getImplicitWidth() const;
    virtual qreal getImplicitHeight() const;

    void ensureDoc();

    QRectF setupTextLayout(qreal * const baseline);
    void setupCustomLineGeometry(QTextLine &line, qreal &height, int lineOffset = 0);
    bool isLinkActivatedConnected();
    bool isLinkHoveredConnected();
    static QString anchorAt(const QTextLayout *layout, const QPointF &mousePos);
    QString anchorAt(const QPointF &pos) const;

    inline qreal lineHeight() const { return extra.isAllocated() ? extra->lineHeight : 1.0; }
    inline int maximumLineCount() const { return extra.isAllocated() ? extra->maximumLineCount : INT_MAX; }
    inline QQuickText::LineHeightMode lineHeightMode() const { return extra.isAllocated() ? extra->lineHeightMode : QQuickText::ProportionalHeight; }
    inline QQuickText::FontSizeMode fontSizeMode() const { return extra.isAllocated() ? extra->fontSizeMode : QQuickText::FixedSize; }
    inline int minimumPixelSize() const { return extra.isAllocated() ? extra->minimumPixelSize : 12; }
    inline int minimumPointSize() const { return extra.isAllocated() ? extra->minimumPointSize : 12; }
    static inline QQuickTextPrivate *get(QQuickText *t) { return t->d_func(); }
};

class QQuickPixmap;
class QQuickTextDocumentWithImageResources : public QTextDocument, public QTextObjectInterface
{
    Q_OBJECT
    Q_INTERFACES(QTextObjectInterface)
public:
    QQuickTextDocumentWithImageResources(QQuickItem *parent);
    virtual ~QQuickTextDocumentWithImageResources();

    void setText(const QString &);
    int resourcesLoading() const { return outstanding; }

    QSizeF intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format);
    void drawObject(QPainter *p, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format);

    QImage image(const QTextImageFormat &format);

public Q_SLOTS:
    void clearResources();

Q_SIGNALS:
    void imagesLoaded();

protected:
    QVariant loadResource(int type, const QUrl &name);

    QQuickPixmap *loadPixmap(QQmlContext *context, const QUrl &name);

private Q_SLOTS:
    void reset();
    void requestFinished();

private:
    QHash<QUrl, QQuickPixmap *> m_resources;

    int outstanding;
    static QSet<QUrl> errors;
};

QT_END_NAMESPACE

#endif // QQUICKTEXT_P_P_H