--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/qt3support/text/q3simplerichtext.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,421 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt3Support module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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