q3stylesheet.cpp

奇趣公司比较新的qt/emd版本

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#include "q3stylesheet.h"

#ifndef QT_NO_RICHTEXT

#include "qlayout.h"
#include "qpainter.h"
#include "q3cleanuphandler.h"
#include <qtextdocument.h>

#include <stdio.h>

class Q3StyleSheetItemData
{
public:
    Q3StyleSheetItem::DisplayMode disp;
    int fontitalic;
    int fontunderline;
    int fontstrikeout;
    int fontweight;
    int fontsize;
    int fontsizelog;
    int fontsizestep;
    int lineSpacing;
    QString fontfamily;
    Q3StyleSheetItem *parentstyle;
    QString stylename;
    int ncolumns;
    QColor col;
    bool anchor;
    int align;
    Q3StyleSheetItem::VerticalAlignment valign;
    int margin[5];
    Q3StyleSheetItem::ListStyle list;
    Q3StyleSheetItem::WhiteSpaceMode whitespacemode;
    QString contxt;
    bool selfnest;
    Q3StyleSheet* sheet;
};

/*!
    \class Q3StyleSheetItem qstylesheet.h
    \brief The Q3StyleSheetItem class provides an encapsulation of a set of text styles.

    \compat

    A style sheet item consists of a name and a set of attributes that
    specify its font, color, etc. When used in a \link Q3StyleSheet
    style sheet\endlink (see styleSheet()), items define the name() of
    a rich text tag and the display property changes associated with
    it.

    The \link Q3StyleSheetItem::DisplayMode display mode\endlink
    attribute indicates whether the item is a block, an inline element
    or a list element; see setDisplayMode(). The treatment of
    whitespace is controlled by the \link
    Q3StyleSheetItem::WhiteSpaceMode white space mode\endlink; see
    setWhiteSpaceMode(). An item's margins are set with setMargin(),
    In the case of list items, the list style is set with
    setListStyle(). An item may be a hypertext link anchor; see
    setAnchor(). Other attributes are set with setAlignment(),
    setVerticalAlignment(), setFontFamily(), setFontSize(),
    setFontWeight(), setFontItalic(), setFontUnderline(),
    setFontStrikeOut and setColor().
*/

/*! \enum Q3StyleSheetItem::AdditionalStyleValues
    \internal
*/

/*!
    \enum Q3StyleSheetItem::WhiteSpaceMode

    This enum defines the ways in which Q3StyleSheet can treat
    whitespace.

    \value WhiteSpaceNormal  any sequence of whitespace (including
        line-breaks) is equivalent to a single space.

    \value WhiteSpacePre  whitespace must be output exactly as given
        in the input.

    \value WhiteSpaceNoWrap  multiple spaces are collapsed as with
        WhiteSpaceNormal, but no automatic line-breaks occur. To break
        lines manually, use the \c{<br>} tag.

    \omitvalue WhiteSpaceModeUndefined
*/

/*!
    \enum Q3StyleSheetItem::Margin

    \value MarginLeft  left margin
    \value MarginRight  right margin
    \value MarginTop  top margin
    \value MarginBottom  bottom margin
    \value MarginAll  all margins (left, right, top and bottom)
    \value MarginVertical  top and bottom margins
    \value MarginHorizontal  left and right margins
    \value MarginFirstLine  margin (indentation) of the first line of
        a paragarph (in addition to the MarginLeft of the paragraph)
    \value MarginUndefined
*/

/*!
    Constructs a new style called \a name for the stylesheet \a
    parent.

    All properties in Q3StyleSheetItem are initially in the "do not
    change" state, except \link Q3StyleSheetItem::DisplayMode display
    mode\endlink, which defaults to \c DisplayInline.
*/
Q3StyleSheetItem::Q3StyleSheetItem(Q3StyleSheet* parent, const QString& name)
{
    d = new Q3StyleSheetItemData;
    d->stylename = name.toLower();
    d->sheet = parent;
    init();
    if (parent)
        parent->insert(this);
}

/*!
    Copy constructor. Constructs a copy of \a other that is not bound
    to any style sheet.
*/
Q3StyleSheetItem::Q3StyleSheetItem(const Q3StyleSheetItem & other)
{
    d = new Q3StyleSheetItemData;
    *d = *other.d;
}


/*!
    Destroys the style. Note that Q3StyleSheetItem objects become
    owned by Q3StyleSheet when they are created.
*/
Q3StyleSheetItem::~Q3StyleSheetItem()
{
    delete d;
}

/*!
  Assignment. Assings a copy of \a other that is not bound to any style sheet.
  Unbounds first from previous style sheet.
 */
Q3StyleSheetItem& Q3StyleSheetItem::operator=(const Q3StyleSheetItem& other)
{
    if (&other == this)
        return *this;
    delete d;
    d = new Q3StyleSheetItemData;
    *d = *other.d;
    return *this;
}

/*!
    Returns the style sheet this item is in.
*/
Q3StyleSheet* Q3StyleSheetItem::styleSheet()
{
    return d->sheet;
}

/*!
    \overload

    Returns the style sheet this item is in.
*/
const Q3StyleSheet* Q3StyleSheetItem::styleSheet() const
{
    return d->sheet;
}

/*!
  \internal
  Internal initialization
 */
void Q3StyleSheetItem::init()
{
    d->disp = DisplayInline;

    d->fontitalic = Undefined;
    d->fontunderline = Undefined;
    d->fontstrikeout = Undefined;
    d->fontweight = Undefined;
    d->fontsize = Undefined;
    d->fontsizelog = Undefined;
    d->fontsizestep = 0;
    d->ncolumns = Undefined;
    d->col = QColor(); // !isValid()
    d->anchor = false;
    d->align = Undefined;
    d->valign = VAlignBaseline;
    d->margin[0] = Undefined;
    d->margin[1] = Undefined;
    d->margin[2] = Undefined;
    d->margin[3] = Undefined;
    d->margin[4] = Undefined;
    d->list = ListStyleUndefined;
    d->whitespacemode = WhiteSpaceModeUndefined;
    d->selfnest = true;
    d->lineSpacing = Undefined;
}

/*!
    Returns the name of the style item.
*/
QString Q3StyleSheetItem::name() const
{
    return d->stylename;
}

/*!
    Returns the \link Q3StyleSheetItem::DisplayMode display
    mode\endlink of the style.

    \sa setDisplayMode()
*/
Q3StyleSheetItem::DisplayMode Q3StyleSheetItem::displayMode() const
{
    return d->disp;
}

/*!
    \enum Q3StyleSheetItem::DisplayMode

    This enum type defines the way adjacent elements are displayed.

    \value DisplayBlock  elements are displayed as a rectangular block
        (e.g. \c{<p>...</p>}).

    \value DisplayInline  elements are displayed in a horizontally
        flowing sequence (e.g. \c{<em>...</em>}).

    \value DisplayListItem  elements are displayed in a vertical
        sequence (e.g. \c{<li>...</li>}).

    \value DisplayNone  elements are not displayed at all.

    \omitvalue DisplayModeUndefined
*/

/*!
    Sets the display mode of the style to \a m.

    \sa displayMode()
 */
void Q3StyleSheetItem::setDisplayMode(DisplayMode m)
{
    d->disp=m;
}


/*!
    Returns the alignment of this style. Possible values are
    Qt::AlignAuto, Qt::AlignLeft, Qt::AlignRight, Qt::AlignCenter or
    Qt::AlignJustify.

    \sa setAlignment(), Qt::Alignment
*/
int Q3StyleSheetItem::alignment() const
{
    return d->align;
}

/*!
    Sets the alignment to \a f. This only makes sense for styles with
    a \link Q3StyleSheetItem::DisplayMode display mode\endlink of
    DisplayBlock. Possible values are Qt::AlignAuto, Qt::AlignLeft,
    Qt::AlignRight, Qt::AlignCenter or Qt::AlignJustify.

    \sa alignment(), displayMode(), Qt::Alignment
*/
void Q3StyleSheetItem::setAlignment(int f)
{
    d->align = f;
}


/*!
    Returns the vertical alignment of the style. Possible values are
    VAlignBaseline, VAlignSub or VAlignSuper.

    \sa setVerticalAlignment()
*/
Q3StyleSheetItem::VerticalAlignment Q3StyleSheetItem::verticalAlignment() const
{
    return d->valign;
}

/*!
    \enum Q3StyleSheetItem::VerticalAlignment

    This enum type defines the way elements are aligned vertically.
    This is only supported for text elements.

    \value VAlignBaseline align the baseline of the element (or the
        bottom, if the element doesn't have a baseline) with the
        baseline of the parent

    \value VAlignSub subscript the element

    \value VAlignSuper superscript the element

*/


/*!
    Sets the vertical alignment to \a valign. Possible values are
    VAlignBaseline, VAlignSub or VAlignSuper.

    The vertical alignment property is not inherited.

    \sa verticalAlignment()
*/
void Q3StyleSheetItem::setVerticalAlignment(VerticalAlignment valign)
{
    d->valign = valign;
}


/*!
    Returns true if the style sets an italic font; otherwise returns
    false.

    \sa setFontItalic(), definesFontItalic()
*/
bool Q3StyleSheetItem::fontItalic() const
{
    return d->fontitalic > 0;
}

/*!
    If \a italic is true sets italic for the style; otherwise sets
    upright.

    \sa fontItalic(), definesFontItalic()
*/
void Q3StyleSheetItem::setFontItalic(bool italic)
{
    d->fontitalic = italic?1:0;
}

/*!
    Returns true if the style defines a font shape; otherwise returns
    false. A style does not define any shape until setFontItalic() is
    called.

    \sa setFontItalic(), fontItalic()
*/
bool Q3StyleSheetItem::definesFontItalic() const
{
    return d->fontitalic != Undefined;
}

/*!
    Returns true if the style sets an underlined font; otherwise
    returns false.

    \sa setFontUnderline(), definesFontUnderline()
*/
bool Q3StyleSheetItem::fontUnderline() const
{
    return d->fontunderline > 0;
}

/*!
    If \a underline is true, sets underline for the style; otherwise
    sets no underline.

    \sa fontUnderline(), definesFontUnderline()
*/
void Q3StyleSheetItem::setFontUnderline(bool underline)
{
    d->fontunderline = underline?1:0;
}

/*!
    Returns true if the style defines a setting for the underline
    property of the font; otherwise returns false. A style does not
    define this until setFontUnderline() is called.

    \sa setFontUnderline(), fontUnderline()
*/
bool Q3StyleSheetItem::definesFontUnderline() const
{
    return d->fontunderline != Undefined;
}


/*!
    Returns true if the style sets a strike out font; otherwise
    returns false.

    \sa setFontStrikeOut(), definesFontStrikeOut()
*/
bool Q3StyleSheetItem::fontStrikeOut() const
{
    return d->fontstrikeout > 0;
}

/*!
    If \a strikeOut is true, sets strike out for the style; otherwise
    sets no strike out.

    \sa fontStrikeOut(), definesFontStrikeOut()
*/
void Q3StyleSheetItem::setFontStrikeOut(bool strikeOut)
{
    d->fontstrikeout = strikeOut?1:0;
}

/*!
    Returns true if the style defines a setting for the strikeOut
    property of the font; otherwise returns false. A style does not
    define this until setFontStrikeOut() is called.

    \sa setFontStrikeOut(), fontStrikeOut()
*/
bool Q3StyleSheetItem::definesFontStrikeOut() const
{
    return d->fontstrikeout != Undefined;
}


/*!
    Returns the font weight setting of the style. This is either a
    valid QFont::Weight or the value Q3StyleSheetItem::Undefined.

    \sa setFontWeight(), QFont
*/
int Q3StyleSheetItem::fontWeight() const
{
    return d->fontweight;
}

/*!
    Sets the font weight setting of the style to \a w. Valid values
    are those defined by QFont::Weight.

    \sa QFont, fontWeight()
*/
void Q3StyleSheetItem::setFontWeight(int w)
{
    d->fontweight = w;
}

/*!
    Returns the logical font size setting of the style. This is either
    a valid size between 1 and 7 or Q3StyleSheetItem::Undefined.

    \sa setLogicalFontSize(), setLogicalFontSizeStep(), QFont::pointSize(), QFont::setPointSize()