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#include "q3simplerichtext.h"

#ifndef QT_NO_RICHTEXT

#include "q3richtext_p.h"

#include "qapplication.h"

QT_BEGIN_NAMESPACE

class Q3SimpleRichTextData

{

public:

    Q3TextDocument *doc;

    QFont font;

    int cachedWidth;

    bool cachedWidthWithPainter;

    void adjustSize();

};

// Pull this private function in from qglobal.cpp

Q_CORE_EXPORT unsigned int qt_int_sqrt(unsigned int n);

void Q3SimpleRichTextData::adjustSize() {

    QFontMetrics fm(font);

    int mw =  fm.width(QString(QLatin1Char('x'))) * 80;

    int w = mw;

    doc->doLayout(0,w);

    if (doc->widthUsed() != 0) {

        w = qt_int_sqrt(5 * doc->height() * doc->widthUsed() / 3);

        doc->doLayout(0, qMin(w, mw));

        if (w*3 < 5*doc->height()) {

            w = qt_int_sqrt(2 * doc->height() * doc->widthUsed());

            doc->doLayout(0,qMin(w, mw));

        }

    }

    cachedWidth = doc->width();

    cachedWidthWithPainter = false;

}

/*!

    \class Q3SimpleRichText

    \brief The Q3SimpleRichText class provides a small displayable piece of rich text.

    \compat

    This class encapsulates simple rich text usage in which a string

    is interpreted as rich text and can be drawn. This is particularly

    useful if you want to display some rich text in a custom widget. A

    Q3StyleSheet is needed to interpret the tags and format the rich

    text. Qt provides a default HTML-like style sheet, but you may

    define custom style sheets.

    Once created, the rich text object can be queried for its width(),

    height(), and the actual width used (see widthUsed()). Most

    importantly, it can be drawn on any given QPainter with draw().

    Q3SimpleRichText can also be used to implement hypertext or active

    text facilities by using anchorAt(). A hit test through inText()

    makes it possible to use simple rich text for text objects in

    editable drawing canvases.

    Once constructed from a string the contents cannot be changed,

    only resized. If the contents change, just throw the rich text

    object away and make a new one with the new contents.

    For large documents use QTextEdit or QTextBrowser. For very small

    items of rich text you can use a QLabel.

    If you are using Q3SimpleRichText to print in high resolution you

    should call setWidth(QPainter, int) so that the content will be

    laid out properly on the page.

*/

/*!

    Constructs a Q3SimpleRichText from the rich text string \a text and

    the font \a fnt.

    The font is used as a basis for the text rendering. When using

    rich text rendering on a widget \e w, you would normally specify

    the widget's font, for example:

    \snippet doc/src/snippets/code/src_qt3support_text_q3simplerichtext.cpp 0

    \a context is the optional context of the rich text object. This

    becomes important if \a text contains relative references, for

    example within image tags. Q3SimpleRichText always uses the default

    mime source factory (see \l{Q3MimeSourceFactory::defaultFactory()})

    to resolve those references. The context will then be used to

    calculate the absolute path. See

    Q3MimeSourceFactory::makeAbsolute() for details.

    The \a sheet is an optional style sheet. If it is 0, the default

    style sheet will be used (see \l{Q3StyleSheet::defaultSheet()}).

*/

Q3SimpleRichText::Q3SimpleRichText(const QString& text, const QFont& fnt,

                                  const QString& context, const Q3StyleSheet* sheet)

{

    d = new Q3SimpleRichTextData;

    d->cachedWidth = -1;

    d->cachedWidthWithPainter = false;

    d->font = fnt;

    d->doc = new Q3TextDocument(0);

    d->doc->setTextFormat(Qt::RichText);

    d->doc->setLeftMargin(0);

    d->doc->setRightMargin(0);

    d->doc->setFormatter(new Q3TextFormatterBreakWords);

    d->doc->setStyleSheet((Q3StyleSheet*)sheet);

    d->doc->setDefaultFormat(fnt, QColor());

    d->doc->setText(text, context);

}

/*!

    Constructs a Q3SimpleRichText from the rich text string \a text and

    the font \a fnt.

    This is a slightly more complex constructor for Q3SimpleRichText

    that takes an additional mime source factory \a factory, a page

    break parameter \a pageBreak and a bool \a linkUnderline. \a

    linkColor is only provided for compatibility, but has no effect,

    as QPalette::link() color is used now.

    \a context is the optional context of the rich text object. This

    becomes important if \a text contains relative references, for

    example within image tags. Q3SimpleRichText always uses the default

    mime source factory (see \l{Q3MimeSourceFactory::defaultFactory()})

    to resolve those references. The context will then be used to

    calculate the absolute path. See

    Q3MimeSourceFactory::makeAbsolute() for details.

    The \a sheet is an optional style sheet. If it is 0, the default

    style sheet will be used (see \l{Q3StyleSheet::defaultSheet()}).

    This constructor is useful for creating a Q3SimpleRichText object

    suitable for printing. Set \a pageBreak to be the height of the

    contents area of the pages.

*/

Q3SimpleRichText::Q3SimpleRichText(const QString& text, const QFont& fnt,

                                  const QString& context, const Q3StyleSheet* sheet,

                                  const Q3MimeSourceFactory* factory, int pageBreak,

                                  const QColor& /*linkColor*/, bool linkUnderline)

{

    d = new Q3SimpleRichTextData;

    d->cachedWidth = -1;

    d->cachedWidthWithPainter = false;

    d->font = fnt;

    d->doc = new Q3TextDocument(0);

    d->doc->setTextFormat(Qt::RichText);

    d->doc->setFormatter(new Q3TextFormatterBreakWords);

    d->doc->setStyleSheet((Q3StyleSheet*)sheet);

    d->doc->setDefaultFormat(fnt, QColor());

    d->doc->flow()->setPageSize(pageBreak);

    d->doc->setPageBreakEnabled(true);

#ifndef QT_NO_MIME

    d->doc->setMimeSourceFactory((Q3MimeSourceFactory*)factory);

#endif

    d->doc->setUnderlineLinks(linkUnderline);

    d->doc->setText(text, context);

}

/*!

    Destroys the rich text object, freeing memory.

*/

Q3SimpleRichText::~Q3SimpleRichText()

{

    delete d->doc;

    delete d;

}

/*!

    \overload

    Sets the width of the rich text object to \a w pixels.

    \sa height(), adjustSize()

*/

void Q3SimpleRichText::setWidth(int w)

{

    if (w == d->cachedWidth && !d->cachedWidthWithPainter)

        return;

    d->doc->formatter()->setAllowBreakInWords(d->doc->isPageBreakEnabled());

    d->cachedWidth = w;

    d->cachedWidthWithPainter = false;

    d->doc->doLayout(0, w);

}

/*!

    Sets the width of the rich text object to \a w pixels,

    recalculating the layout as if it were to be drawn with painter \a

    p.

    Passing a painter is useful when you intend drawing on devices

    other than the screen, for example a QPrinter.

    \sa height(), adjustSize()

*/

void Q3SimpleRichText::setWidth(QPainter *p, int w)

{

    if (w == d->cachedWidth  && d->cachedWidthWithPainter)

        return;

    d->doc->formatter()->setAllowBreakInWords(d->doc->isPageBreakEnabled() ||

                       (p && p->device() &&

                     p->device()->devType() == QInternal::Printer));

    p->save();

    d->cachedWidth = w;

    d->cachedWidthWithPainter = true;

    d->doc->doLayout(p, w);

    p->restore();

}

/*!

    Returns the set width of the rich text object in pixels.

    \sa widthUsed()

*/

int Q3SimpleRichText::width() const

{

    if (d->cachedWidth < 0)

        d->adjustSize();

    return d->doc->width();

}

/*!

    Returns the width in pixels that is actually used by the rich text

    object. This can be smaller or wider than the set width.

    It may be wider, for example, if the text contains images or

    non-breakable words that are already wider than the available

    space. It's smaller when the object only consists of lines that do

    not fill the width completely.

    \sa width()

*/

int Q3SimpleRichText::widthUsed() const

{

    if (d->cachedWidth < 0)

        d->adjustSize();

    return d->doc->widthUsed();

}

/*!

    Returns the height of the rich text object in pixels.

    \sa setWidth()

*/

int Q3SimpleRichText::height() const

{

    if (d->cachedWidth < 0)

        d->adjustSize();

    return d->doc->height();

}

/*!

    Adjusts the rich text object to a reasonable size.

    \sa setWidth()

*/

void Q3SimpleRichText::adjustSize()

{

    d->adjustSize();

}

/*!

    Draws the formatted text with painter \a p, at position (\a x, \a

    y), clipped to \a clipRect. The clipping rectangle is given in the

    rich text object's coordinates translated by (\a x, \a y). Passing

    an null rectangle results in no clipping. Colors from the color

    group \a cg are used as needed, and if not 0, *\a{paper} is

    used as the background brush.

    Note that the display code is highly optimized to reduce flicker,

    so passing a brush for \a paper is preferable to simply clearing

    the area to be painted and then calling this without a brush.

*/

void Q3SimpleRichText::draw(QPainter *p, int x, int y, const QRect& clipRect,

                            const QColorGroup &cg, const QBrush* paper) const

{

    p->save();

    if (d->cachedWidth < 0)

        d->adjustSize();

    QRect r = clipRect;

    if (!r.isNull())

        r.moveBy(-x, -y);

    if (paper)

        d->doc->setPaper(new QBrush(*paper));

    QPalette pal2 = cg;

    if (d->doc->paper())

        pal2.setBrush(QPalette::Base, *d->doc->paper());

    if (!clipRect.isNull())

        p->setClipRect(clipRect);

    p->translate(x, y);

    d->doc->draw(p, r, pal2, paper);

    p->translate(-x, -y);

    p->restore();

}

/*! \fn void Q3SimpleRichText::draw(QPainter *p, int x, int y, const QRegion& clipRegion,

  const QColorGroup &cg, const QBrush* paper) const

  Use the version with clipRect instead of this \a clipRegion version,

  since this region version has problems with larger documents on some

  platforms (on X11 regions internally are represented with 16-bit

  coordinates).

*/

/*!

    Returns the context of the rich text object. If no context has

    been specified in the constructor, an empty string is returned. The

    context is the path to use to look up relative links, such as

    image tags and anchor references.

*/

QString Q3SimpleRichText::context() const

{

    return d->doc->context();

}

/*!

    Returns the anchor at the requested position, \a pos. An empty

    string is returned if no anchor is specified for this position.

*/

QString Q3SimpleRichText::anchorAt(const QPoint& pos) const

{

    if (d->cachedWidth < 0)

        d->adjustSize();

    Q3TextCursor c(d->doc);

    c.place(pos, d->doc->firstParagraph(), true);

    return c.paragraph()->at(c.index())->anchorHref();

}

/*!

    Returns true if \a pos is within a text line of the rich text

    object; otherwise returns false.

*/

bool Q3SimpleRichText::inText(const QPoint& pos) const

{

    if (d->cachedWidth < 0)

        d->adjustSize();

    if (pos.y()  > d->doc->height())

        return false;

    Q3TextCursor c(d->doc);

    c.place(pos, d->doc->firstParagraph());

    return c.totalOffsetX() + c.paragraph()->at(c.index())->x +

        c.paragraph()->at(c.index())->format()->width(c.paragraph()->at(c.index())->c) > pos.x();

}

/*!

    Sets the default font for the rich text object to \a f

*/

void Q3SimpleRichText::setDefaultFont(const QFont &f)

{

    if (d->font == f)

        return;

    d->font = f;

    d->cachedWidth = -1;

    d->cachedWidthWithPainter = false;

    d->doc->setDefaultFormat(f, QColor());

    d->doc->setText(d->doc->originalText(), d->doc->context());

}

QT_END_NAMESPACE

#endif //QT_NO_RICHTEXT