/*
* File: styleengine.cc
*
* Copyright 2008-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include "../dlib/dlib.h"
#include "msg.h"
#include "prefs.h"
#include "misc.h"
#include "html_common.hh"
#include "styleengine.hh"
#include "web.hh"
#include "capi.h"
using namespace lout::misc;
using namespace dw::core::style;
/**
* Signal handler for "delete": This handles the case when an instance
* of StyleImage is deleted, possibly when the cache client is still
* active.
*
* \todo Not neccessary for dw::Image? (dw::Image also implements
* lout::signal::ObservedObject.)
*/
class StyleImageDeletionReceiver:
public lout::signal::ObservedObject::DeletionReceiver
{
int clientKey;
public:
StyleImageDeletionReceiver (int clientKey);
~StyleImageDeletionReceiver ();
void deleted (lout::signal::ObservedObject *object);
};
StyleImageDeletionReceiver::StyleImageDeletionReceiver (int clientKey)
{
this->clientKey = clientKey;
}
StyleImageDeletionReceiver::~StyleImageDeletionReceiver ()
{
}
void StyleImageDeletionReceiver::deleted (lout::signal::ObservedObject *object)
{
a_Capi_stop_client (clientKey, 0);
delete this;
}
// ----------------------------------------------------------------------
StyleEngine::StyleEngine (dw::core::Layout *layout,
const DilloUrl *pageUrl, const DilloUrl *baseUrl) {
StyleAttrs style_attrs;
FontAttrs font_attrs;
doctree = new Doctree ();
stack = new lout::misc::SimpleVector <Node> (1);
cssContext = new CssContext ();
buildUserStyle ();
this->layout = layout;
this->pageUrl = pageUrl ? a_Url_dup(pageUrl) : NULL;
this->baseUrl = baseUrl ? a_Url_dup(baseUrl) : NULL;
importDepth = 0;
stackPush ();
Node *n = stack->getLastRef ();
/* Create a dummy font, attribute, and tag for the bottom of the stack. */
font_attrs.name = prefs.font_sans_serif;
font_attrs.size = roundInt(14 * prefs.font_factor);
if (font_attrs.size < prefs.font_min_size)
font_attrs.size = prefs.font_min_size;
if (font_attrs.size > prefs.font_max_size)
font_attrs.size = prefs.font_max_size;
font_attrs.weight = 400;
font_attrs.style = FONT_STYLE_NORMAL;
font_attrs.letterSpacing = 0;
font_attrs.fontVariant = FONT_VARIANT_NORMAL;
style_attrs.initValues ();
style_attrs.font = Font::create (layout, &font_attrs);
style_attrs.color = Color::create (layout, 0);
style_attrs.backgroundColor = Color::create (layout, prefs.bg_color);
n->style = Style::create (&style_attrs);
}
StyleEngine::~StyleEngine () {
while (doctree->top ())
endElement (doctree->top ()->element);
stackPop (); // dummy node on the bottom of the stack
assert (stack->size () == 0);
a_Url_free(pageUrl);
a_Url_free(baseUrl);
delete stack;
delete doctree;
delete cssContext;
}
void StyleEngine::stackPush () {
static const Node emptyNode = {
NULL, NULL, NULL, NULL, NULL, NULL, false, NULL
};
stack->setSize (stack->size () + 1, emptyNode);
}
void StyleEngine::stackPop () {
Node *n = stack->getRef (stack->size () - 1);
delete n->styleAttrProperties;
delete n->styleAttrPropertiesImportant;
delete n->nonCssProperties;
if (n->style)
n->style->unref ();
if (n->wordStyle)
n->wordStyle->unref ();
if (n->backgroundStyle)
n->backgroundStyle->unref ();
stack->setSize (stack->size () - 1);
}
/**
* \brief tell the styleEngine that a new html element has started.
*/
void StyleEngine::startElement (int element, BrowserWindow *bw) {
style (bw); // ensure that style of current node is computed
stackPush ();
Node *n = stack->getLastRef ();
DoctreeNode *dn = doctree->push ();
dn->element = element;
n->doctreeNode = dn;
}
void StyleEngine::startElement (const char *tagname, BrowserWindow *bw) {
startElement (a_Html_tag_index (tagname), bw);
}
void StyleEngine::setId (const char *id) {
DoctreeNode *dn = doctree->top ();
assert (dn->id == NULL);
dn->id = dStrdup (id);
}
/**
* \brief split a string at sep chars and return a SimpleVector of strings
*/
static lout::misc::SimpleVector<char *> *splitStr (const char *str, char sep) {
const char *p1 = NULL;
lout::misc::SimpleVector<char *> *list =
new lout::misc::SimpleVector<char *> (1);
for (;; str++) {
if (*str != '\0' && *str != sep) {
if (!p1)
p1 = str;
} else if (p1) {
list->increase ();
list->set (list->size () - 1, dStrndup (p1, str - p1));
p1 = NULL;
}
if (*str == '\0')
break;
}
return list;
}
void StyleEngine::setClass (const char *klass) {
DoctreeNode *dn = doctree->top ();
assert (dn->klass == NULL);
dn->klass = splitStr (klass, ' ');
}
void StyleEngine::setStyle (const char *styleAttr) {
Node *n = stack->getRef (stack->size () - 1);
assert (n->styleAttrProperties == NULL);
// parse style information from style="" attribute, if it exists
if (styleAttr && prefs.parse_embedded_css) {
n->styleAttrProperties = new CssPropertyList (true);
n->styleAttrPropertiesImportant = new CssPropertyList (true);
CssParser::parseDeclarationBlock (baseUrl, styleAttr, strlen (styleAttr),
n->styleAttrProperties,
n->styleAttrPropertiesImportant);
}
}
/**
* \brief Instruct StyleEngine to use the nonCssHints from parent element
* This is only used for tables where nonCssHints on the TABLE-element
* (e.g. border=1) also affect child elements like TD.
*/
void StyleEngine::inheritNonCssHints () {
Node *pn = stack->getRef (stack->size () - 2);
if (pn->nonCssProperties) {
Node *n = stack->getRef (stack->size () - 1);
CssPropertyList *origNonCssProperties = n->nonCssProperties;
n->nonCssProperties = new CssPropertyList(*pn->nonCssProperties, true);
if (origNonCssProperties) // original nonCssProperties have precedence
origNonCssProperties->apply (n->nonCssProperties);
delete origNonCssProperties;
}
}
void StyleEngine::clearNonCssHints () {
Node *n = stack->getRef (stack->size () - 1);
delete n->nonCssProperties;
n->nonCssProperties = NULL;
}
/**
* \brief Use of the background color of the parent style as default.
* This is only used in table code to allow for colors specified for
* table rows as table rows are currently no widgets and therefore
* don't draw any background.
*/
void StyleEngine::inheritBackgroundColor () {
stack->getRef (stack->size () - 1)->inheritBackgroundColor = true;
}
dw::core::style::Color *StyleEngine::backgroundColor () {
for (int i = 1; i < stack->size (); i++) {
Node *n = stack->getRef (i);
if (n->style && n->style->backgroundColor)
return n->style->backgroundColor;
}
return NULL;
}
dw::core::style::StyleImage *StyleEngine::backgroundImage
(dw::core::style::BackgroundRepeat *bgRepeat,
dw::core::style::BackgroundAttachment *bgAttachment,
dw::core::style::Length *bgPositionX,
dw::core::style::Length *bgPositionY) {
for (int i = 1; i < stack->size (); i++) {
Node *n = stack->getRef (i);
if (n->style && n->style->backgroundImage) {
*bgRepeat = n->style->backgroundRepeat;
*bgAttachment = n->style->backgroundAttachment;
*bgPositionX = n->style->backgroundPositionX;
*bgPositionY = n->style->backgroundPositionY;
return n->style->backgroundImage;
}
}
return NULL;
}
/**
* \brief set the CSS pseudo class :link.
*/
void StyleEngine::setPseudoLink () {
DoctreeNode *dn = doctree->top ();
dn->pseudo = "link";
}
/**
* \brief set the CSS pseudo class :visited.
*/
void StyleEngine::setPseudoVisited () {
DoctreeNode *dn = doctree->top ();
dn->pseudo = "visited";
}
/**
* \brief tell the styleEngine that a html element has ended.
*/
void StyleEngine::endElement (int element) {
assert (element == doctree->top ()->element);
stackPop ();
doctree->pop ();
}
void StyleEngine::preprocessAttrs (dw::core::style::StyleAttrs *attrs) {
/* workaround for styling of inline elements */
if (stack->getRef (stack->size () - 2)->inheritBackgroundColor) {
attrs->backgroundColor =
stack->getRef (stack->size () - 2)->style->backgroundColor;
attrs->backgroundImage =
stack->getRef (stack->size () - 2)->style->backgroundImage;
attrs->backgroundRepeat =
stack->getRef (stack->size () - 2)->style->backgroundRepeat;
attrs->backgroundAttachment =
stack->getRef (stack->size () - 2)->style->backgroundAttachment;
attrs->backgroundPositionX =
stack->getRef (stack->size () - 2)->style->backgroundPositionX;
attrs->backgroundPositionY =
stack->getRef (stack->size () - 2)->style->backgroundPositionY;
attrs->valign = stack->getRef (stack->size () - 2)->style->valign;
}
attrs->borderColor.top = (Color *) -1;
attrs->borderColor.bottom = (Color *) -1;
attrs->borderColor.left = (Color *) -1;
attrs->borderColor.right = (Color *) -1;
/* initial value of border-width is 'medium' */
attrs->borderWidth.top = 2;
attrs->borderWidth.bottom = 2;
attrs->borderWidth.left = 2;
attrs->borderWidth.right = 2;
}
void StyleEngine::postprocessAttrs (dw::core::style::StyleAttrs *attrs) {
/* if border-color is not specified, use color as computed value */
if (attrs->borderColor.top == (Color *) -1)
attrs->borderColor.top = attrs->color;
if (attrs->borderColor.bottom == (Color *) -1)
attrs->borderColor.bottom = attrs->color;
if (attrs->borderColor.left == (Color *) -1)
attrs->borderColor.left = attrs->color;
if (attrs->borderColor.right == (Color *) -1)
attrs->borderColor.right = attrs->color;
/* computed value of border-width is 0 if border-style
is 'none' or 'hidden' */
if (attrs->borderStyle.top == BORDER_NONE ||
attrs->borderStyle.top == BORDER_HIDDEN)
attrs->borderWidth.top = 0;
if (attrs->borderStyle.bottom == BORDER_NONE ||
attrs->borderStyle.bottom == BORDER_HIDDEN)
attrs->borderWidth.bottom = 0;
if (attrs->borderStyle.left == BORDER_NONE ||
attrs->borderStyle.left == BORDER_HIDDEN)
attrs->borderWidth.left = 0;
if (attrs->borderStyle.right == BORDER_NONE ||
attrs->borderStyle.right == BORDER_HIDDEN)
attrs->borderWidth.right = 0;
}
/**
* \brief Make changes to StyleAttrs attrs according to CssPropertyList props.
*/
void StyleEngine::apply (int i, StyleAttrs *attrs, CssPropertyList *props,
BrowserWindow *bw) {
FontAttrs fontAttrs = *attrs->font;
Font *parentFont = stack->get (i - 1).style->font;
char *c, *fontName;
int lineHeight;
DilloUrl *imgUrl = NULL;
/* Determine font first so it can be used to resolve relative lengths. */
for (int i = 0; i < props->size (); i++) {
CssProperty *p = props->getRef (i);
switch (p->name) {
case CSS_PROPERTY_FONT_FAMILY:
// Check font names in comma separated list.
// Note, that p->value.strVal is modified, so that in future calls
// the matching font name can be used directly.
fontName = NULL;
while (p->value.strVal) {
if ((c = strchr(p->value.strVal, ',')))
*c = '\0';
dStrstrip(p->value.strVal);
if (dStrAsciiCasecmp (p->value.strVal, "serif") == 0)
fontName = prefs.font_serif;
else if (dStrAsciiCasecmp (p->value.strVal, "sans-serif") == 0)
fontName = prefs.font_sans_serif;
else if (dStrAsciiCasecmp (p->value.strVal, "cursive") == 0)
fontName = prefs.font_cursive;
else if (dStrAsciiCasecmp (p->value.strVal, "fantasy") == 0)
fontName = prefs.font_fantasy;
else if (dStrAsciiCasecmp (p->value.strVal, "monospace") == 0)
fontName = prefs.font_monospace;
else if (Font::exists(layout, p->value.strVal))
fontName = p->value.strVal;
if (fontName) { // font found
fontAttrs.name = fontName;
break;
} else if (c) { // try next from list
memmove(p->value.strVal, c + 1, strlen(c + 1) + 1);
} else { // no font found
break;
}
}
break;
case CSS_PROPERTY_FONT_SIZE:
if (p->type == CSS_TYPE_ENUM) {
switch (p->value.intVal) {
case CSS_FONT_SIZE_XX_SMALL:
fontAttrs.size = roundInt(8.1 * prefs.font_factor);
break;
case CSS_FONT_SIZE_X_SMALL:
fontAttrs.size = roundInt(9.7 * prefs.font_factor);
break;
case CSS_FONT_SIZE_SMALL:
fontAttrs.size = roundInt(11.7 * prefs.font_factor);
break;
case CSS_FONT_SIZE_MEDIUM:
fontAttrs.size = roundInt(14.0 * prefs.font_factor);
break;
case CSS_FONT_SIZE_LARGE:
fontAttrs.size = roundInt(16.8 * prefs.font_factor);
break;
case CSS_FONT_SIZE_X_LARGE:
fontAttrs.size = roundInt(20.2 * prefs.font_factor);
break;
case CSS_FONT_SIZE_XX_LARGE:
fontAttrs.size = roundInt(24.2 * prefs.font_factor);
break;
case CSS_FONT_SIZE_SMALLER:
fontAttrs.size = roundInt(fontAttrs.size * 0.83 *
prefs.font_factor);
break;
case CSS_FONT_SIZE_LARGER:
fontAttrs.size = roundInt(fontAttrs.size * 1.2 *
prefs.font_factor);
break;
default:
assert(false); // invalid font-size enum
}
} else {
computeValue (&fontAttrs.size, p->value.intVal, parentFont,
parentFont->size);
}
if (fontAttrs.size < prefs.font_min_size)
fontAttrs.size = prefs.font_min_size;
if (fontAttrs.size > prefs.font_max_size)
fontAttrs.size = prefs.font_max_size;
break;
case CSS_PROPERTY_FONT_STYLE:
fontAttrs.style = (FontStyle) p->value.intVal;
break;
case CSS_PROPERTY_FONT_WEIGHT:
if (p->type == CSS_TYPE_ENUM) {
switch (p->value.intVal) {
case CSS_FONT_WEIGHT_BOLD:
fontAttrs.weight = 700;
break;
case CSS_FONT_WEIGHT_BOLDER:
fontAttrs.weight += 300;
break;
case CSS_FONT_WEIGHT_LIGHT:
fontAttrs.weight = 100;
break;
case CSS_FONT_WEIGHT_LIGHTER:
fontAttrs.weight -= 300;
break;
case CSS_FONT_WEIGHT_NORMAL:
fontAttrs.weight = 400;
break;
default:
assert(false); // invalid font weight value
break;
}
} else {
fontAttrs.weight = p->value.intVal;
}
if (fontAttrs.weight < 100)
fontAttrs.weight = 100;
if (fontAttrs.weight > 900)
fontAttrs.weight = 900;
break;
case CSS_PROPERTY_LETTER_SPACING:
if (p->type == CSS_TYPE_ENUM) {
if (p->value.intVal == CSS_LETTER_SPACING_NORMAL) {
fontAttrs.letterSpacing = 0;
}
} else {
computeValue (&fontAttrs.letterSpacing, p->value.intVal,
parentFont, parentFont->size);
}
/* Limit letterSpacing to reasonable values to avoid overflows e.g,
* when measuring word width.
*/
if (fontAttrs.letterSpacing > 1000)
fontAttrs.letterSpacing = 1000;
else if (fontAttrs.letterSpacing < -1000)
fontAttrs.letterSpacing = -1000;
break;
case CSS_PROPERTY_FONT_VARIANT:
fontAttrs.fontVariant = (FontVariant) p->value.intVal;
break;
default:
break;
}
}
attrs->font = Font::create (layout, &fontAttrs);
for (int i = 0; i < props->size (); i++) {
CssProperty *p = props->getRef (i);
switch (p->name) {
/* \todo missing cases */
case CSS_PROPERTY_BACKGROUND_ATTACHMENT:
attrs->backgroundAttachment =
(BackgroundAttachment) p->value.intVal;
break;
case CSS_PROPERTY_BACKGROUND_COLOR:
if (prefs.allow_white_bg || p->value.intVal != 0xffffff)
attrs->backgroundColor = Color::create(layout, p->value.intVal);
else
attrs->backgroundColor =
Color::create(layout, prefs.white_bg_replacement);
break;
case CSS_PROPERTY_BACKGROUND_IMAGE:
// p->value.strVal should be absolute, so baseUrl is not needed
imgUrl = a_Url_new (p->value.strVal, NULL);
break;
case CSS_PROPERTY_BACKGROUND_POSITION:
computeLength (&attrs->backgroundPositionX, p->value.posVal->posX,
attrs->font);
computeLength (&attrs->backgroundPositionY, p->value.posVal->posY,
attrs->font);
break;
case CSS_PROPERTY_BACKGROUND_REPEAT:
attrs->backgroundRepeat = (BackgroundRepeat) p->value.intVal;
break;
case CSS_PROPERTY_BORDER_COLLAPSE:
attrs->borderCollapse = (BorderCollapse) p->value.intVal;
break;
case CSS_PROPERTY_BORDER_TOP_COLOR:
attrs->borderColor.top = (p->type == CSS_TYPE_ENUM) ? NULL :
Color::create (layout, p->value.intVal);
break;
case CSS_PROPERTY_BORDER_BOTTOM_COLOR:
attrs->borderColor.bottom = (p->type == CSS_TYPE_ENUM) ? NULL :
Color::create (layout, p->value.intVal);
break;
case CSS_PROPERTY_BORDER_LEFT_COLOR:
attrs->borderColor.left = (p->type == CSS_TYPE_ENUM) ? NULL :
Color::create (layout, p->value.intVal);
break;
case CSS_PROPERTY_BORDER_RIGHT_COLOR:
attrs->borderColor.right = (p->type == CSS_TYPE_ENUM) ? NULL :
Color::create (layout, p->value.intVal);
break;
case CSS_PROPERTY_BORDER_BOTTOM_STYLE:
attrs->borderStyle.bottom = (BorderStyle) p->value.intVal;
break;
case CSS_PROPERTY_BORDER_LEFT_STYLE:
attrs->borderStyle.left = (BorderStyle) p->value.intVal;
break;
case CSS_PROPERTY_BORDER_RIGHT_STYLE:
attrs->borderStyle.right = (BorderStyle) p->value.intVal;
break;
case CSS_PROPERTY_BORDER_TOP_STYLE:
attrs->borderStyle.top = (BorderStyle) p->value.intVal;
break;
case CSS_PROPERTY_BORDER_BOTTOM_WIDTH:
computeBorderWidth (&attrs->borderWidth.bottom, p, attrs->font);
break;
case CSS_PROPERTY_BORDER_LEFT_WIDTH:
computeBorderWidth (&attrs->borderWidth.left, p, attrs->font);
break;
case CSS_PROPERTY_BORDER_RIGHT_WIDTH:
computeBorderWidth (&attrs->borderWidth.right, p, attrs->font);
break;
case CSS_PROPERTY_BORDER_TOP_WIDTH:
computeBorderWidth (&attrs->borderWidth.top, p, attrs->font);
break;
case CSS_PROPERTY_BORDER_SPACING:
computeValue (&attrs->hBorderSpacing, p->value.intVal,attrs->font);
computeValue (&attrs->vBorderSpacing, p->value.intVal,attrs->font);
break;
case CSS_PROPERTY_COLOR:
attrs->color = Color::create (layout, p->value.intVal);
break;
case CSS_PROPERTY_CURSOR:
attrs->cursor = (Cursor) p->value.intVal;
break;
case CSS_PROPERTY_DISPLAY:
attrs->display = (DisplayType) p->value.intVal;
break;
case CSS_PROPERTY_LINE_HEIGHT:
if (p->type == CSS_TYPE_ENUM) { //only valid enum value is "normal"
attrs->lineHeight = dw::core::style::LENGTH_AUTO;
} else if (p->type == CSS_TYPE_LENGTH_PERCENTAGE_NUMBER) {
if (CSS_LENGTH_TYPE (p->value.intVal) == CSS_LENGTH_TYPE_NONE) {
attrs->lineHeight =
createPerLength(CSS_LENGTH_VALUE(p->value.intVal));
} else if (computeValue (&lineHeight, p->value.intVal,
attrs->font, attrs->font->size)) {
attrs->lineHeight = createAbsLength(lineHeight);
}
}
break;
case CSS_PROPERTY_LIST_STYLE_POSITION:
attrs->listStylePosition = (ListStylePosition) p->value.intVal;
break;
case CSS_PROPERTY_LIST_STYLE_TYPE:
attrs->listStyleType = (ListStyleType) p->value.intVal;
break;
case CSS_PROPERTY_MARGIN_BOTTOM:
computeValue (&attrs->margin.bottom, p->value.intVal, attrs->font);
if (attrs->margin.bottom < 0) // \todo fix negative margins in dw/*
attrs->margin.bottom = 0;
break;
case CSS_PROPERTY_MARGIN_LEFT:
computeValue (&attrs->margin.left, p->value.intVal, attrs->font);
if (attrs->margin.left < 0) // \todo fix negative margins in dw/*
attrs->margin.left = 0;
break;
case CSS_PROPERTY_MARGIN_RIGHT:
computeValue (&attrs->margin.right, p->value.intVal, attrs->font);
if (attrs->margin.right < 0) // \todo fix negative margins in dw/*
attrs->margin.right = 0;
break;
case CSS_PROPERTY_MARGIN_TOP:
computeValue (&attrs->margin.top, p->value.intVal, attrs->font);
if (attrs->margin.top < 0) // \todo fix negative margins in dw/*
attrs->margin.top = 0;
break;
case CSS_PROPERTY_PADDING_TOP:
computeValue (&attrs->padding.top, p->value.intVal, attrs->font);
break;
case CSS_PROPERTY_PADDING_BOTTOM:
computeValue (&attrs->padding.bottom, p->value.intVal,attrs->font);
break;
case CSS_PROPERTY_PADDING_LEFT:
computeValue (&attrs->padding.left, p->value.intVal, attrs->font);
break;
case CSS_PROPERTY_PADDING_RIGHT:
computeValue (&attrs->padding.right, p->value.intVal, attrs->font);
break;
case CSS_PROPERTY_TEXT_ALIGN:
attrs->textAlign = (TextAlignType) p->value.intVal;
break;
case CSS_PROPERTY_TEXT_DECORATION:
attrs->textDecoration |= p->value.intVal;
break;
case CSS_PROPERTY_TEXT_INDENT:
computeLength (&attrs->textIndent, p->value.intVal, attrs->font);
break;
case CSS_PROPERTY_TEXT_TRANSFORM:
attrs->textTransform = (TextTransform) p->value.intVal;
break;
case CSS_PROPERTY_VERTICAL_ALIGN:
attrs->valign = (VAlignType) p->value.intVal;
break;
case CSS_PROPERTY_WHITE_SPACE:
attrs->whiteSpace = (WhiteSpace) p->value.intVal;
break;
case CSS_PROPERTY_WIDTH:
computeLength (&attrs->width, p->value.intVal, attrs->font);
break;
case CSS_PROPERTY_HEIGHT:
computeLength (&attrs->height, p->value.intVal, attrs->font);
break;
case CSS_PROPERTY_WORD_SPACING:
if (p->type == CSS_TYPE_ENUM) {
if (p->value.intVal == CSS_WORD_SPACING_NORMAL) {
attrs->wordSpacing = 0;
}
} else {
computeValue(&attrs->wordSpacing, p->value.intVal, attrs->font);
}
/* Limit to reasonable values to avoid overflows */
if (attrs->wordSpacing > 1000)
attrs->wordSpacing = 1000;
else if (attrs->wordSpacing < -1000)
attrs->wordSpacing = -1000;
break;
case PROPERTY_X_LINK:
attrs->x_link = p->value.intVal;
break;
case PROPERTY_X_LANG:
attrs->x_lang[0] = D_ASCII_TOLOWER(p->value.strVal[0]);
if (attrs->x_lang[0])
attrs->x_lang[1] = D_ASCII_TOLOWER(p->value.strVal[1]);
else
attrs->x_lang[1] = 0;
break;
case PROPERTY_X_IMG:
attrs->x_img = p->value.intVal;
break;
case PROPERTY_X_TOOLTIP:
attrs->x_tooltip = Tooltip::create(layout, p->value.strVal);
break;
default:
break;
}
}
if (imgUrl && prefs.load_background_images && attrs->display != DISPLAY_NONE)
{
attrs->backgroundImage = StyleImage::create();
DilloImage *image =
a_Image_new(layout,
(void*)attrs->backgroundImage
->getMainImgRenderer(),
0xffffff);
// we use the pageUrl as requester to prevent cross
// domain requests as specified in domainrc
DilloWeb *web = a_Web_new(bw, imgUrl, pageUrl);
web->Image = image;
a_Image_ref(image);
web->flags |= WEB_Image;
int clientKey;
if ((clientKey = a_Capi_open_url(web, NULL, NULL)) != 0) {
a_Bw_add_client(bw, clientKey, 0);
a_Bw_add_url(bw, imgUrl);
attrs->backgroundImage->connectDeletion
(new StyleImageDeletionReceiver (clientKey));
}
}
a_Url_free (imgUrl);
}
/**
* \brief Resolve relative lengths to absolute values.
*/
bool StyleEngine::computeValue (int *dest, CssLength value, Font *font) {
static float dpmm;
if (dpmm == 0.0)
dpmm = layout->dpiX () / 25.4; /* assume dpiX == dpiY */
switch (CSS_LENGTH_TYPE (value)) {
case CSS_LENGTH_TYPE_PX:
*dest = (int) CSS_LENGTH_VALUE (value);
return true;
case CSS_LENGTH_TYPE_MM:
*dest = roundInt (CSS_LENGTH_VALUE (value) * dpmm);
return true;
case CSS_LENGTH_TYPE_EM:
*dest = roundInt (CSS_LENGTH_VALUE (value) * font->size);
return true;
case CSS_LENGTH_TYPE_EX:
*dest = roundInt (CSS_LENGTH_VALUE(value) * font->xHeight);
return true;
case CSS_LENGTH_TYPE_NONE:
// length values other than 0 without unit are only allowed
// in special cases (line-height) and have to be handled
// separately.
assert ((int) CSS_LENGTH_VALUE (value) == 0);
*dest = 0;
return true;
default:
break;
}
return false;
}
bool StyleEngine::computeValue (int *dest, CssLength value, Font *font,
int percentageBase) {
if (CSS_LENGTH_TYPE (value) == CSS_LENGTH_TYPE_PERCENTAGE) {
*dest = roundInt (CSS_LENGTH_VALUE (value) * percentageBase);
return true;
} else
return computeValue (dest, value, font);
}
bool StyleEngine::computeLength (dw::core::style::Length *dest,
CssLength value, Font *font) {
int v;
if (CSS_LENGTH_TYPE (value) == CSS_LENGTH_TYPE_PERCENTAGE) {
*dest = createPerLength (CSS_LENGTH_VALUE (value));
return true;
} else if (CSS_LENGTH_TYPE (value) == CSS_LENGTH_TYPE_AUTO) {
*dest = dw::core::style::LENGTH_AUTO;
return true;
} else if (computeValue (&v, value, font)) {
*dest = createAbsLength (v);
return true;
}
return false;
}
void StyleEngine::computeBorderWidth (int *dest, CssProperty *p,
dw::core::style::Font *font) {
if (p->type == CSS_TYPE_ENUM) {
switch (p->value.intVal) {
case CSS_BORDER_WIDTH_THIN:
*dest = 1;
break;
case CSS_BORDER_WIDTH_MEDIUM:
*dest = 2;
break;
case CSS_BORDER_WIDTH_THICK:
*dest = 3;
break;
default:
assert(false);
}
} else {
computeValue (dest, p->value.intVal, font);
}
}
/**
* \brief Similar to StyleEngine::style(), but with backgroundColor set.
* A normal style might have backgroundColor == NULL to indicate a transparent
* background. This method ensures that backgroundColor is set.
*/
Style * StyleEngine::backgroundStyle (BrowserWindow *bw) {
if (!stack->getRef (stack->size () - 1)->backgroundStyle) {
StyleAttrs attrs = *style (bw);
for (int i = stack->size () - 1; i >= 0 && ! attrs.backgroundColor; i--)
attrs.backgroundColor = stack->getRef (i)->style->backgroundColor;
assert (attrs.backgroundColor);
stack->getRef (stack->size () - 1)->backgroundStyle =
Style::create (&attrs);
}
return stack->getRef (stack->size () - 1)->backgroundStyle;
}
/**
* \brief Create a new style object based on the previously opened / closed
* HTML elements and the nonCssProperties that have been set.
* This method is private. Call style() to get a current style object.
*/
Style * StyleEngine::style0 (int i, BrowserWindow *bw) {
CssPropertyList props, *styleAttrProperties, *styleAttrPropertiesImportant;
CssPropertyList *nonCssProperties;
// get previous style from the stack
StyleAttrs attrs = *stack->getRef (i - 1)->style;
// Ensure that StyleEngine::style0() has not been called before for
// this element.
// Style computation is expensive so limit it as much as possible.
// If this assertion is hit, you need to rearrange the code that is
// doing styleEngine calls to call setNonCssHint() before calling
// style() or wordStyle() for each new element.
assert (stack->getRef (i)->style == NULL);
// reset values that are not inherited according to CSS
attrs.resetValues ();
preprocessAttrs (&attrs);
styleAttrProperties = stack->getRef (i)->styleAttrProperties;
styleAttrPropertiesImportant = stack->getRef(i)->styleAttrPropertiesImportant;
nonCssProperties = stack->getRef (i)->nonCssProperties;
// merge style information
cssContext->apply (&props, doctree, stack->getRef(i)->doctreeNode,
styleAttrProperties, styleAttrPropertiesImportant,
nonCssProperties);
// apply style
apply (i, &attrs, &props, bw);
postprocessAttrs (&attrs);
stack->getRef (i)->style = Style::create (&attrs);
return stack->getRef (i)->style;
}
Style * StyleEngine::wordStyle0 (BrowserWindow *bw) {
StyleAttrs attrs = *style (bw);
attrs.resetValues ();
if (stack->getRef (stack->size() - 1)->inheritBackgroundColor) {
attrs.backgroundColor = style (bw)->backgroundColor;
attrs.backgroundImage = style (bw)->backgroundImage;
attrs.backgroundRepeat = style (bw)->backgroundRepeat;
attrs.backgroundAttachment = style (bw)->backgroundAttachment;
attrs.backgroundPositionX = style (bw)->backgroundPositionX;
attrs.backgroundPositionY = style (bw)->backgroundPositionY;
}
attrs.valign = style (bw)->valign;
stack->getRef(stack->size() - 1)->wordStyle = Style::create(&attrs);
return stack->getRef (stack->size () - 1)->wordStyle;
}
/**
* \brief Recompute all style information from scratch
* This is used to take into account CSS styles for the HTML-element.
* The CSS data is only completely available after parsing the HEAD-section
* and thereby after the HTML-element has been opened.
* Note that restyle() does not change any styles in the widget tree.
*/
void StyleEngine::restyle (BrowserWindow *bw) {
for (int i = 1; i < stack->size (); i++) {
Node *n = stack->getRef (i);
if (n->style) {
n->style->unref ();
n->style = NULL;
}
if (n->wordStyle) {
n->wordStyle->unref ();
n->wordStyle = NULL;
}
if (n->backgroundStyle) {
n->backgroundStyle->unref ();
n->backgroundStyle = NULL;
}
style0 (i, bw);
}
}
void StyleEngine::parse (DilloHtml *html, DilloUrl *url, const char *buf,
int buflen, CssOrigin origin) {
if (importDepth > 10) { // avoid looping with recursive @import directives
MSG_WARN("Maximum depth of CSS @import reached--ignoring stylesheet.\n");
return;
}
importDepth++;
CssParser::parse (html, url, cssContext, buf, buflen, origin);
importDepth--;
}
/**
* \brief Create the user agent style.
*
* The user agent style defines how dillo renders HTML in the absence of
* author or user styles.
*/
void StyleEngine::init () {
const char *cssBuf =
"body {margin: 5px}"
"big {font-size: 1.17em}"
"blockquote, dd {margin-left: 40px; margin-right: 40px}"
"center {text-align: center}"
"dt {font-weight: bolder}"
":link {color: blue; text-decoration: underline; cursor: pointer}"
":visited {color: #800080; text-decoration: underline; cursor: pointer}"
"h1, h2, h3, h4, h5, h6, b, strong {font-weight: bolder}"
"address, article, aside, center, div, figure, figcaption, footer,"
" h1, h2, h3, h4, h5, h6, header, nav, ol, p, pre, section, ul"
" {display: block}"
"i, em, cite, address, var {font-style: italic}"
":link img, :visited img {border: 1px solid}"
"frameset, ul, ol, dir {margin-left: 40px}"
/* WORKAROUND: It should be margin: 1em 0
* but as we don't collapse these margins yet, it
* look better like this.
*/
"p {margin: 0.5em 0}"
"figure {margin: 1em 40px}"
"h1 {font-size: 2em; margin-top: .67em; margin-bottom: 0}"
"h2 {font-size: 1.5em; margin-top: .75em; margin-bottom: 0}"
"h3 {font-size: 1.17em; margin-top: .83em; margin-bottom: 0}"
"h4 {margin-top: 1.12em; margin-bottom: 0}"
"h5 {font-size: 0.83em; margin-top: 1.5em; margin-bottom: 0}"
"h6 {font-size: 0.75em; margin-top: 1.67em; margin-bottom: 0}"
"hr {width: 100%; border: 1px inset}"
"li {margin-top: 0.1em; display: list-item}"
"pre {white-space: pre}"
"ol {list-style-type: decimal}"
"ul {list-style-type: disc}"
"ul ul {list-style-type: circle}"
"ul ul ul {list-style-type: square}"
"ul ul ul ul {list-style-type: disc}"
"ins, u {text-decoration: underline}"
"small, sub, sup {font-size: 0.83em}"
"sub {vertical-align: sub}"
"sup {vertical-align: super}"
"s, strike, del {text-decoration: line-through}"
/* HTML5 spec notes that mark styling "is just a suggestion and can be
* changed based on implementation feedback"
*/
"mark {background: yellow; color: black;}"
"table {border-spacing: 2px}"
"td, th {padding: 2px}"
"thead, tbody, tfoot {vertical-align: middle}"
"th {font-weight: bolder; text-align: center}"
"code, tt, pre, samp, kbd {font-family: monospace}"
/* WORKAROUND: Reset font properties in tables as some
* pages rely on it (e.g. gmail).
* http://developer.mozilla.org/En/Fixing_Table_Inheritance_in_Quirks_Mode
* has a detailed description of the issue.
*/
"table, caption {font-size: medium; font-weight: normal}";
CssContext context;
CssParser::parse (NULL, NULL, &context, cssBuf, strlen (cssBuf),
CSS_ORIGIN_USER_AGENT);
}
void StyleEngine::buildUserStyle () {
Dstr *style;
char *filename = dStrconcat(dGethomedir(), "/.dillo/style.css", NULL);
if ((style = a_Misc_file2dstr(filename))) {
CssParser::parse (NULL,NULL,cssContext,style->str, style->len,CSS_ORIGIN_USER);
dStr_free (style, 1);
}
dFree (filename);
}