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/****************************************************************************
**
** Copyright (C) 2011 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.
**
** $QT_BEGIN_LICENSE:LGPL$
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** file. Please review the following information to ensure the GNU Lesser
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
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** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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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>
QT_BEGIN_NAMESPACE
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
\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()
*/
int Q3StyleSheetItem::logicalFontSize() const
{
return d->fontsizelog;
}
/*!
Sets the logical font size setting of the style to \a s. Valid
logical sizes are 1 to 7.
\sa logicalFontSize(), QFont::pointSize(), QFont::setPointSize()
*/
void Q3StyleSheetItem::setLogicalFontSize(int s)
{
d->fontsizelog = s;
}
/*!
Returns the logical font size step of this style.
The default is 0. Tags such as \c big define \c +1; \c small
defines \c -1.
\sa setLogicalFontSizeStep()
*/
int Q3StyleSheetItem::logicalFontSizeStep() const
{
return d->fontsizestep;
}
/*!
Sets the logical font size step of this style to \a s.
\sa logicalFontSizeStep()
*/
void Q3StyleSheetItem::setLogicalFontSizeStep(int s)
{
d->fontsizestep = s;
}
/*!
Sets the font size setting of the style to \a s points.
\sa fontSize(), QFont::pointSize(), QFont::setPointSize()
*/
void Q3StyleSheetItem::setFontSize(int s)
{
d->fontsize = s;
}
/*!
Returns the font size setting of the style. This is either a valid
point size or Q3StyleSheetItem::Undefined.
\sa setFontSize(), QFont::pointSize(), QFont::setPointSize()
*/
int Q3StyleSheetItem::fontSize() const
{
return d->fontsize;
}
/*!
Returns the style's font family setting. This is either a valid
font family or an empty string if no family has been set.
\sa setFontFamily(), QFont::family(), QFont::setFamily()
*/
QString Q3StyleSheetItem::fontFamily() const
{
return d->fontfamily;
}
/*!
Sets the font family setting of the style to \a fam.
\sa fontFamily(), QFont::family(), QFont::setFamily()
*/
void Q3StyleSheetItem::setFontFamily(const QString& fam)
{
d->fontfamily = fam;
}
/*!
Returns the number of columns for this style.
\sa setNumberOfColumns(), displayMode(), setDisplayMode()
*/
int Q3StyleSheetItem::numberOfColumns() const
{
return d->ncolumns;
}
/*!
Sets the number of columns for this style to \a ncols. Elements in the style
are divided into columns.
This makes sense only if the style uses a block display mode
(see Q3StyleSheetItem::DisplayMode).
\sa numberOfColumns()
*/
void Q3StyleSheetItem::setNumberOfColumns(int ncols)
{
if (ncols > 0)
d->ncolumns = ncols;
}
/*!
Returns the text color of this style or an invalid color if no
color has been set.
\sa setColor() QColor::isValid()
*/
QColor Q3StyleSheetItem::color() const
{
return d->col;
}
/*!
Sets the text color of this style to \a c.
\sa color()
*/
void Q3StyleSheetItem::setColor(const QColor &c)
{
d->col = c;
}
/*!
Returns whether this style is an anchor.
\sa setAnchor()
*/
bool Q3StyleSheetItem::isAnchor() const
{
return d->anchor;
}
/*!
If \a anc is true, sets this style to be an anchor (hypertext
link); otherwise sets it to not be an anchor. Elements in this
style link to other documents or anchors.
\sa isAnchor()
*/
void Q3StyleSheetItem::setAnchor(bool anc)
{
d->anchor = anc;
}
/*!
Returns the whitespace mode.
\sa setWhiteSpaceMode() WhiteSpaceMode
*/
Q3StyleSheetItem::WhiteSpaceMode Q3StyleSheetItem::whiteSpaceMode() const
{
return d->whitespacemode;
}
/*!
Sets the whitespace mode to \a m.
\sa WhiteSpaceMode
*/
void Q3StyleSheetItem::setWhiteSpaceMode(WhiteSpaceMode m)
{
d->whitespacemode = m;
}
/*!
Returns the width of margin \a m in pixels.
The margin, \a m, can be MarginLeft, MarginRight,
MarginTop, MarginBottom, or MarginFirstLine
\sa setMargin() Margin
*/
int Q3StyleSheetItem::margin(Margin m) const
{
if (m == MarginAll) {
return d->margin[MarginLeft];
} else if (m == MarginVertical) {
return d->margin[MarginTop];
} else if (m == MarginHorizontal) {
return d->margin[MarginLeft];
} else {
return d->margin[m];
}
}
/*!
Sets the width of margin \a m to \a v pixels.
The margin, \a m, can be \c MarginLeft, \c MarginRight, \c
MarginTop, \c MarginBottom, MarginFirstLine, \c MarginAll,
\c MarginVertical or \c MarginHorizontal. The value \a v must
be >= 0.
\sa margin()
*/
void Q3StyleSheetItem::setMargin(Margin m, int v)
{
if (m == MarginAll) {
d->margin[MarginLeft] = v;
d->margin[MarginRight] = v;
d->margin[MarginTop] = v;
d->margin[MarginBottom] = v;
} else if (m == MarginVertical) {
d->margin[MarginTop] = v;
d->margin[MarginBottom] = v;
} else if (m == MarginHorizontal) {
d->margin[MarginLeft] = v;
d->margin[MarginRight] = v;
} else {
d->margin[m] = v;
}
}
/*!
Returns the list style of the style.
\sa setListStyle() ListStyle
*/
Q3StyleSheetItem::ListStyle Q3StyleSheetItem::listStyle() const
{
return d->list;
}
/*!
\enum Q3StyleSheetItem::ListStyle
This enum type defines how the items in a list are prefixed when
displayed.
\value ListDisc a filled circle (i.e. a bullet)
\value ListCircle an unfilled circle
\value ListSquare a filled square
\value ListDecimal an integer in base 10: \e 1, \e 2, \e 3, ...
\value ListLowerAlpha a lowercase letter: \e a, \e b, \e c, ...
\value ListUpperAlpha an uppercase letter: \e A, \e B, \e C, ...
\omitvalue ListStyleUndefined
*/
/*!
Sets the list style of the style to \a s.
This is used by nested elements that have a display mode of \c
DisplayListItem.
\sa listStyle() DisplayMode ListStyle
*/
void Q3StyleSheetItem::setListStyle(ListStyle s)
{
d->list=s;
}
/*!
Returns a space-separated list of names of styles that may contain
elements of this style. If nothing has been set, contexts()
returns an empty string, which indicates that this style can be
nested everywhere.
\sa setContexts()
*/
QString Q3StyleSheetItem::contexts() const
{
return d->contxt;
}
/*!
Sets a space-separated list of names of styles that may contain
elements of this style. If \a c is empty, the style can be nested
everywhere.
\sa contexts()
*/
void Q3StyleSheetItem::setContexts(const QString& c)
{
d->contxt = QLatin1Char(' ') + c + QLatin1Char(' ');
}
/*!
Returns true if this style can be nested into an element of style
\a s; otherwise returns false.
\sa contexts(), setContexts()
*/
bool Q3StyleSheetItem::allowedInContext(const Q3StyleSheetItem* s) const
{
if (d->contxt.isEmpty())
return true;
return d->contxt.contains(QLatin1Char(' ')+s->name()+QLatin1Char(' '));
}
/*!
Returns true if this style has self-nesting enabled; otherwise
returns false.
\sa setSelfNesting()
*/
bool Q3StyleSheetItem::selfNesting() const
{
return d->selfnest;
}
/*!
Sets the self-nesting property for this style to \a nesting.
In order to support "dirty" HTML, paragraphs \c{<p>} and list
items \c{<li>} are not self-nesting. This means that starting a
new paragraph or list item automatically closes the previous one.
\sa selfNesting()
*/
void Q3StyleSheetItem::setSelfNesting(bool nesting)
{
d->selfnest = nesting;
}
/*!
\internal
Sets the linespacing to be at least \a ls pixels.
For compatibility with previous Qt releases, small values get
treated differently: If \a ls is smaller than the default font
line spacing in pixels at parse time, the resulting line spacing
is the sum of the default line spacing plus \a ls. We recommend
not relying on this behavior.
*/
void Q3StyleSheetItem::setLineSpacing(int ls)
{
d->lineSpacing = ls;
}
/*!
Returns the line spacing.
*/
int Q3StyleSheetItem::lineSpacing() const
{
return d->lineSpacing;
}
//************************************************************************
//************************************************************************
/*!
\class Q3StyleSheet
\brief The Q3StyleSheet class is a collection of styles for rich text
rendering and a generator of tags.
\compat
By creating Q3StyleSheetItem objects for a style sheet you build a
definition of a set of tags. This definition will be used by the
internal rich text rendering system to parse and display text
documents to which the style sheet applies. Rich text is normally
visualized in a QTextEdit or a QTextBrowser. However, QLabel,
QWhatsThis and QMessageBox also support it, and other classes are
likely to follow. With QSimpleRichText it is possible to use the
rich text renderer for custom widgets as well.
The default Q3StyleSheet object has the following style bindings,
sorted by structuring bindings, anchors, character style bindings
(i.e. inline styles), special elements such as horizontal lines or
images, and other tags. In addition, rich text supports simple
HTML tables.
The structuring tags are
\table
\header \i Structuring tags \i Notes
\row \i \c{<qt>}...\c{</qt>}
\i A Qt rich text document. It understands the following
attributes:
\list
\i \c title -- The caption of the document. This attribute is
easily accessible with QTextEdit::documentTitle().
\i \c type -- The type of the document. The default type is \c
page. It indicates that the document is displayed in a
page of its own. Another style is \c detail, which can be
used to explain certain expressions in more detail in a
few sentences. For \c detail, QTextBrowser will then keep
the current page and display the new document in a small
popup similar to QWhatsThis. Note that links will not work
in documents with \c{<qt type="detail">...</qt>}.
\i \c bgcolor -- The background color, for example \c
bgcolor="yellow" or \c bgcolor="#0000FF".
\i \c background -- The background pixmap, for example \c
background="granite.xpm". The pixmap name will be resolved
by a Q3MimeSourceFactory().
\i \c text -- The default text color, for example \c text="red".
\i \c link -- The link color, for example \c link="green".
\endlist
\row \i \c{<h1>...</h1>}
\i A top-level heading.
\row \i \c{<h2>...</h2>}
\i A sublevel heading.
\row \i \c{<h3>...</h3>}
\i A sub-sublevel heading.
\row \i \c{<p>...</p>}
\i A left-aligned paragraph. Adjust the alignment with the \c
align attribute. Possible values are \c left, \c right and
\c center.
\row \i \c{<center>...}<br>\c{</center>}
\i A centered paragraph.
\row \i \c{<blockquote>...}<br>\c{</blockquote>}
\i An indented paragraph that is useful for quotes.
\row \i \c{<ul>...</ul>}
\i An unordered list. You can also pass a type argument to
define the bullet style. The default is \c type=disc;
other types are \c circle and \c square.
\row \i \c{<ol>...</ol>}
\i An ordered list. You can also pass a type argument to
define the enumeration label style. The default is \c
type="1"; other types are \c "a" and \c "A".
\row \i \c{<li>...</li>}
\i A list item. This tag can be used only within the context
of \c{<ol>} or \c{<ul>}.
\row \i \c{<pre>...</pre>}
\i For larger chunks of code. Whitespaces in the contents are
preserved. For small bits of code use the inline-style \c
code.
\endtable
Anchors and links are done with a single tag:
\table
\header \i Anchor tags \i Notes
\row \i \c{<a>...</a>}
\i An anchor or link.
\list
\i A link is created by using an \c href
attribute, for example
<br>\c{<a href="target.qml">Link Text</a>}. Links to
targets within a document are achieved in the same way
as for HTML, e.g.
<br>\c{<a href="target.qml#subtitle">Link Text</a>}.
\i A target is created by using a \c name
attribute, for example
<br>\c{<a name="subtitle"><h2>Sub Title</h2></a>}.
\endlist
\endtable
The default character style bindings are
\table
\header \i Style tags \i Notes
\row \i \c{<em>...</em>}
\i Emphasized. By default this is the same as \c{<i>...</i>}
(italic).
\row \i \c{<strong>...</strong>}
\i Strong. By default this is the same as \c{<b>...</b>}
(bold).
\row \i \c{<i>...</i>}
\i Italic font style.
\row \i \c{<b>...</b>}
\i Bold font style.
\row \i \c{<u>...</u>}
\i Underlined font style.
\row \i \c{<s>...</s>}
\i Strike out font style.
\row \i \c{<big>...</big>}
\i A larger font size.
\row \i \c{<small>...</small>}
\i A smaller font size.
\row \i \c{<sub>...</sub>}
\i Subscripted text
\row \i \c{<sup>...</sup>}
\i Superscripted text
\row \i \c{<code>...</code>}
\i Indicates code. By default this is the same as
\c{<tt>...</tt>} (typewriter). For larger chunks of code
use the block-tag \c{<}\c{pre>}.
\row \i \c{<tt>...</tt>}
\i Typewriter font style.
\row \i \c{<font>...</font>}
\i Customizes the font size, family and text color. The tag
understands the following attributes:
\list
\i \c color -- The text color, for example \c color="red" or
\c color="#FF0000".
\i \c size -- The logical size of the font. Logical sizes 1
to 7 are supported. The value may either be absolute
(for example, \c size=3) or relative (\c size=-2). In
the latter case the sizes are simply added.
\i \c face -- The family of the font, for example \c face=times.
\endlist
\endtable
Special elements are:
\table
\header \i Special tags \i Notes
\row \i \c{<img>}
\i An image. The image name for the mime source factory is
given in the source attribute, for example
\c{<img src="qt.xpm">} The image tag also understands the
attributes \c width and \c height that determine the size
of the image. If the pixmap does not fit the specified
size it will be scaled automatically (by using
QImage::smoothScale()).
The \c align attribute determines where the image is
placed. By default, an image is placed inline just like a
normal character. Specify \c left or \c right to place the
image at the respective side.
\row \i \c{<hr>}
\i A horizontal line.
\row \i \c{<br>}
\i A line break.
\row \i \c{<nobr>...</nobr>}
\i No break. Prevents word wrap.
\endtable
In addition, rich text supports simple HTML tables. A table
consists of one or more rows each of which contains one or more
cells. Cells are either data cells or header cells, depending on
their content. Cells which span rows and columns are supported.
\table
\header \i Table tags \i Notes
\row \i \c{<table>...</table>}
\i A table. Tables support the following attributes:
\list
\i \c bgcolor -- The background color.
\i \c width -- The table width. This is either an absolute
pixel width or a relative percentage of the table's
width, for example \c width=80%.
\i \c border -- The width of the table border. The default is
0 (= no border).
\i \c cellspacing -- Additional space around the table cells.
The default is 2.
\i \c cellpadding -- Additional space around the contents of
table cells. The default is 1.
\endlist
\row \i \c{<tr>...</tr>}
\i A table row. This is only valid within a \c table. Rows
support the following attribute:
\list
\i \c bgcolor -- The background color.
\endlist
\row \i \c{<th>...</th>}
\i A table header cell. Similar to \c td, but defaults to
center alignment and a bold font.
\row \i \c{<td>...</td>}
\i A table data cell. This is only valid within a \c tr.
Cells support the following attributes:
\list
\i \c bgcolor -- The background color.
\i \c width -- The cell width. This is either an absolute
pixel width or a relative percentage of table's width,
for example \c width=50%.
\i \c colspan -- Specifies how many columns this cell spans.
The default is 1.
\i \c rowspan -- Specifies how many rows this cell spans. The
default is 1.
\i \c align -- Qt::Alignment; possible values are \c left, \c
right, and \c center. The default is \c left.
\i \c valign -- Qt::Vertical alignment; possible values are \c
top, \c middle, and \c bottom. The default is \c middle.
\endlist
\endtable
*/
/*!
Creates a style sheet called \a name, with parent \a parent. Like
any QObject it will be deleted when its parent is destroyed (if
the child still exists).
By default the style sheet has the tag definitions defined above.
*/
Q3StyleSheet::Q3StyleSheet(QObject *parent, const char *name)
: QObject(parent)
{
setObjectName(QLatin1String(name));
init();
}
/*!
Destroys the style sheet. All styles inserted into the style sheet
will be deleted.
*/
Q3StyleSheet::~Q3StyleSheet()
{
QHash<QString, Q3StyleSheetItem *>::iterator it = styles.begin();
while (it != styles.end()) {
delete it.value();
++it;
}
}
/*!
\internal
Initialized the style sheet to the basic Qt style.
*/
void Q3StyleSheet::init()
{
nullstyle = new Q3StyleSheetItem(this, QString::fromLatin1(""));
Q3StyleSheetItem *style;
style = new Q3StyleSheetItem(this, QLatin1String("qml")); // compatibility
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style = new Q3StyleSheetItem(this, QString::fromLatin1("qt"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style = new Q3StyleSheetItem(this, QString::fromLatin1("a"));
style->setAnchor(true);
style = new Q3StyleSheetItem(this, QString::fromLatin1("em"));
style->setFontItalic(true);
style = new Q3StyleSheetItem(this, QString::fromLatin1("i"));
style->setFontItalic(true);
style = new Q3StyleSheetItem(this, QString::fromLatin1("big"));
style->setLogicalFontSizeStep(1);
style = new Q3StyleSheetItem(this, QString::fromLatin1("large")); // compatibility
style->setLogicalFontSizeStep(1);
style = new Q3StyleSheetItem(this, QString::fromLatin1("small"));
style->setLogicalFontSizeStep(-1);
style = new Q3StyleSheetItem(this, QString::fromLatin1("strong"));
style->setFontWeight(QFont::Bold);
style = new Q3StyleSheetItem(this, QString::fromLatin1("b"));
style->setFontWeight(QFont::Bold);
style = new Q3StyleSheetItem(this, QString::fromLatin1("h1"));
style->setFontWeight(QFont::Bold);
style->setLogicalFontSize(6);
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style-> setMargin(Q3StyleSheetItem::MarginTop, 18);
style-> setMargin(Q3StyleSheetItem::MarginBottom, 12);
style = new Q3StyleSheetItem(this, QString::fromLatin1("h2"));
style->setFontWeight(QFont::Bold);
style->setLogicalFontSize(5);
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style-> setMargin(Q3StyleSheetItem::MarginTop, 16);
style-> setMargin(Q3StyleSheetItem::MarginBottom, 12);
style = new Q3StyleSheetItem(this, QString::fromLatin1("h3"));
style->setFontWeight(QFont::Bold);
style->setLogicalFontSize(4);
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style-> setMargin(Q3StyleSheetItem::MarginTop, 14);
style-> setMargin(Q3StyleSheetItem::MarginBottom, 12);
style = new Q3StyleSheetItem(this, QString::fromLatin1("h4"));
style->setFontWeight(QFont::Bold);
style->setLogicalFontSize(3);
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style-> setMargin(Q3StyleSheetItem::MarginVertical, 12);
style = new Q3StyleSheetItem(this, QString::fromLatin1("h5"));
style->setFontWeight(QFont::Bold);
style->setLogicalFontSize(2);
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style-> setMargin(Q3StyleSheetItem::MarginTop, 12);
style-> setMargin(Q3StyleSheetItem::MarginBottom, 4);
style = new Q3StyleSheetItem(this, QString::fromLatin1("p"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style-> setMargin(Q3StyleSheetItem::MarginVertical, 12);
style->setSelfNesting(false);
style = new Q3StyleSheetItem(this, QString::fromLatin1("center"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setAlignment(Qt::AlignCenter);
style = new Q3StyleSheetItem(this, QString::fromLatin1("twocolumn"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setNumberOfColumns(2);
style = new Q3StyleSheetItem(this, QString::fromLatin1("multicol"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
(void) new Q3StyleSheetItem(this, QString::fromLatin1("font"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("ul"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setListStyle(Q3StyleSheetItem::ListDisc);
style-> setMargin(Q3StyleSheetItem::MarginVertical, 12);
style->setMargin(Q3StyleSheetItem::MarginLeft, 40);
style = new Q3StyleSheetItem(this, QString::fromLatin1("ol"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setListStyle(Q3StyleSheetItem::ListDecimal);
style-> setMargin(Q3StyleSheetItem::MarginVertical, 12);
style->setMargin(Q3StyleSheetItem::MarginLeft, 40);
style = new Q3StyleSheetItem(this, QString::fromLatin1("li"));
style->setDisplayMode(Q3StyleSheetItem::DisplayListItem);
style->setSelfNesting(false);
style = new Q3StyleSheetItem(this, QString::fromLatin1("code"));
style->setFontFamily(QString::fromLatin1("Courier New,courier"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("tt"));
style->setFontFamily(QString::fromLatin1("Courier New,courier"));
new Q3StyleSheetItem(this, QString::fromLatin1("img"));
new Q3StyleSheetItem(this, QString::fromLatin1("br"));
new Q3StyleSheetItem(this, QString::fromLatin1("hr"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("sub"));
style->setVerticalAlignment(Q3StyleSheetItem::VAlignSub);
style = new Q3StyleSheetItem(this, QString::fromLatin1("sup"));
style->setVerticalAlignment(Q3StyleSheetItem::VAlignSuper);
style = new Q3StyleSheetItem(this, QString::fromLatin1("pre"));
style->setFontFamily(QString::fromLatin1("Courier New,courier"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setWhiteSpaceMode(Q3StyleSheetItem::WhiteSpacePre);
style-> setMargin(Q3StyleSheetItem::MarginVertical, 12);
style = new Q3StyleSheetItem(this, QString::fromLatin1("blockquote"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setMargin(Q3StyleSheetItem::MarginHorizontal, 40);
style = new Q3StyleSheetItem(this, QString::fromLatin1("head"));
style->setDisplayMode(Q3StyleSheetItem::DisplayNone);
style = new Q3StyleSheetItem(this, QString::fromLatin1("body"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style = new Q3StyleSheetItem(this, QString::fromLatin1("div"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock) ;
style = new Q3StyleSheetItem(this, QString::fromLatin1("span"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("dl"));
style-> setMargin(Q3StyleSheetItem::MarginVertical, 8);
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style = new Q3StyleSheetItem(this, QString::fromLatin1("dt"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setContexts(QString::fromLatin1("dl"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("dd"));
style->setDisplayMode(Q3StyleSheetItem::DisplayBlock);
style->setMargin(Q3StyleSheetItem::MarginLeft, 30);
style->setContexts(QString::fromLatin1("dt dl"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("u"));
style->setFontUnderline(true);
style = new Q3StyleSheetItem(this, QString::fromLatin1("s"));
style->setFontStrikeOut(true);
style = new Q3StyleSheetItem(this, QString::fromLatin1("nobr"));
style->setWhiteSpaceMode(Q3StyleSheetItem::WhiteSpaceNoWrap);
// compatibily with some minor 3.0.x Qt versions that had an
// undocumented <wsp> tag. ### Remove 3.1
style = new Q3StyleSheetItem(this, QString::fromLatin1("wsp"));
style->setWhiteSpaceMode(Q3StyleSheetItem::WhiteSpacePre);
// tables
style = new Q3StyleSheetItem(this, QString::fromLatin1("table"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("tr"));
style->setContexts(QString::fromLatin1("table"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("td"));
style->setContexts(QString::fromLatin1("tr"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("th"));
style->setFontWeight(QFont::Bold);
style->setAlignment(Qt::AlignCenter);
style->setContexts(QString::fromLatin1("tr"));
style = new Q3StyleSheetItem(this, QString::fromLatin1("html"));
}
static Q3StyleSheet* defaultsheet = 0;
static Q3SingleCleanupHandler<Q3StyleSheet> qt_cleanup_stylesheet;
/*!
Returns the application-wide default style sheet. This style sheet
is used by rich text rendering classes such as QSimpleRichText,
QWhatsThis and QMessageBox to define the rendering style and
available tags within rich text documents. It also serves as the
initial style sheet for the more complex render widgets, QTextEdit
and QTextBrowser.
\sa setDefaultSheet()
*/
Q3StyleSheet* Q3StyleSheet::defaultSheet()
{
if (!defaultsheet) {
defaultsheet = new Q3StyleSheet();
qt_cleanup_stylesheet.set(&defaultsheet);
}
return defaultsheet;
}
/*!
Sets the application-wide default style sheet to \a sheet,
deleting any style sheet previously set. The ownership is
transferred to Q3StyleSheet.
\sa defaultSheet()
*/
void Q3StyleSheet::setDefaultSheet(Q3StyleSheet* sheet)
{
if (defaultsheet != sheet) {
if (defaultsheet)
qt_cleanup_stylesheet.reset();
delete defaultsheet;
}
defaultsheet = sheet;
if (defaultsheet)
qt_cleanup_stylesheet.set(&defaultsheet);
}
/*!\internal
Inserts \a style. Any tags generated after this time will be
bound to this style. Note that \a style becomes owned by the
style sheet and will be deleted when the style sheet is destroyed.
*/
void Q3StyleSheet::insert(Q3StyleSheetItem* style)
{
styles.insert(style->name(), style);
}
/*!
Returns the style called \a name or 0 if there is no such style.
*/
Q3StyleSheetItem* Q3StyleSheet::item(const QString& name)
{
if (name.isNull())
return 0;
return styles.value(name);
}
/*!
\overload
Returns the style called \a name or 0 if there is no such style
(const version)
*/
const Q3StyleSheetItem* Q3StyleSheet::item(const QString& name) const
{
if (name.isNull())
return 0;
return styles.value(name);
}
/*! Auxiliary function. Converts the plain text string \a plain to a
rich text formatted paragraph while preserving most of its look.
\a mode defines the whitespace mode. Possible values are \c
Q3StyleSheetItem::WhiteSpacePre (no wrapping, all whitespaces
preserved) and Q3StyleSheetItem::WhiteSpaceNormal (wrapping,
simplified whitespaces).
\sa escape()
*/
QString Q3StyleSheet::convertFromPlainText(const QString& plain, Q3StyleSheetItem::WhiteSpaceMode mode)
{
return Qt::convertFromPlainText(plain, Qt::WhiteSpaceMode(mode));
}
/*!
Auxiliary function. Converts the plain text string \a plain to a
rich text formatted string with any HTML meta-characters escaped.
\sa convertFromPlainText()
*/
QString Q3StyleSheet::escape(const QString& plain)
{
return Qt::escape(plain);
}
// Must doc this enum somewhere, and it is logically related to Q3StyleSheet
/*!
Returns true if the string \a text is likely to be rich text;
otherwise returns false.
This function uses a fast and therefore simple heuristic. It
mainly checks whether there is something that looks like a tag
before the first line break. Although the result may be correct
for common cases, there is no guarantee.
*/
bool Q3StyleSheet::mightBeRichText(const QString& text)
{
return Qt::mightBeRichText(text);
}
/*!
\fn void Q3StyleSheet::error(const QString& msg) const
This virtual function is called when an error occurs when
processing rich text. Reimplement it if you need to catch error
messages.
Errors might occur if some rich text strings contain tags that are
not understood by the stylesheet, if some tags are nested
incorrectly, or if tags are not closed properly.
\a msg is the error message.
*/
void Q3StyleSheet::error(const QString&) const
{
}
/*!
Scales the font \a font to the appropriate physical point size
corresponding to the logical font size \a logicalSize.
When calling this function, \a font has a point size corresponding
to the logical font size 3.
Logical font sizes range from 1 to 7, with 1 being the smallest.
\sa Q3StyleSheetItem::logicalFontSize(), Q3StyleSheetItem::logicalFontSizeStep(), QFont::setPointSize()
*/
void Q3StyleSheet::scaleFont(QFont& font, int logicalSize) const
{
if (logicalSize < 1)
logicalSize = 1;
if (logicalSize > 7)
logicalSize = 7;
int baseSize = font.pointSize();
bool pixel = false;
if (baseSize == -1) {
baseSize = font.pixelSize();
pixel = true;
}
int s;
switch (logicalSize) {
case 1:
s = 7*baseSize/10;
break;
case 2:
s = (8 * baseSize) / 10;
break;
case 4:
s = (12 * baseSize) / 10;
break;
case 5:
s = (15 * baseSize) / 10;
break;
case 6:
s = 2 * baseSize;
break;
case 7:
s = (24 * baseSize) / 10;
break;
default:
s = baseSize;
}
if (pixel)
font.setPixelSize(qMax(1, s));
else
font.setPointSize(qMax(1, s));
}
QT_END_NAMESPACE
#endif // QT_NO_RICHTEXT