annotate src/styleengine.hh @ 1711:b27cf7eb15b6

fix last commit dw::core::style::Style must always hold the computed values of CSS properties, as those are inherited. The computed value of border-width is 0 if border-style is 'none', so avoid the combination of border-width != 0 and border-style 'none'. Refactor StyleEngine a bit.
author Johannes Hofmann <Johannes.Hofmann@gmx.de>
date Fri, 01 Oct 2010 23:28:13 +0200
parents 9225a90ad7dd
children 92b899247f72
rev   line source
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1 #ifndef __STYLEENGINE_HH__
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2 #define __STYLEENGINE_HH__
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3
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4 class StyleEngine;
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5
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6 #include "dw/core.hh"
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7 #include "doctree.hh"
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8 #include "css.hh"
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9 #include "cssparser.hh"
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10
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11 /**
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12 * \brief This class provides the glue between HTML parser and CSS subsystem.
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13 *
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14 * It maintains a document tree and creates and caches style objects for use
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15 * by the HTML parser.
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16 * The HTML parser in turn informs StyleEngine about opened or closed
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17 * HTML elements and their attributes via the startElement() / endElement()
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18 * methods.
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19 */
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20 class StyleEngine {
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21 private:
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22 class Node {
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23 public:
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24 dw::core::style::Style *style;
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25 dw::core::style::Style *wordStyle;
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26 const char *styleAttribute;
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27 bool inheritBackgroundColor;
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28 };
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29
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30 dw::core::Layout *layout;
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31 lout::misc::SimpleVector <Node> *stack;
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32 CssContext *cssContext;
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33 Doctree *doctree;
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34 int importDepth;
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35
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36 dw::core::style::Style *style0 (CssPropertyList *nonCssHints = NULL);
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37 dw::core::style::Style *wordStyle0 (CssPropertyList *nonCssHints = NULL);
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38 void preprocessAttrs (dw::core::style::StyleAttrs *attrs);
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39 void postprocessAttrs (dw::core::style::StyleAttrs *attrs);
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40 void apply (dw::core::style::StyleAttrs *attrs, CssPropertyList *props);
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41 bool computeValue (int *dest, CssLength value,
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42 dw::core::style::Font *font);
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43 bool computeValue (int *dest, CssLength value,
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44 dw::core::style::Font *font, int percentageBase);
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45 bool computeLength (dw::core::style::Length *dest, CssLength value,
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46 dw::core::style::Font *font);
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47 void computeBorderWidth (int *dest, CssProperty *p,
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48 dw::core::style::Font *font);
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49
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50 public:
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51 StyleEngine (dw::core::Layout *layout);
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52 ~StyleEngine ();
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53
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54 void parse (DilloHtml *html, DilloUrl *url, const char *buf, int buflen,
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55 CssOrigin origin);
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56 void startElement (int tag);
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57 void startElement (const char *tagname);
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58 void setId (const char *id);
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59 const char * getId () { return doctree->top ()->id; };
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60 void setClass (const char *klass);
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61 void setStyle (const char *style);
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62 void endElement (int tag);
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63 void setPseudoLink ();
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64 void setPseudoVisited ();
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65 void setNonCssHints (CssPropertyList *nonCssHints);
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66 void inheritBackgroundColor (); /* \todo get rid of this somehow */
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67 dw::core::style::Style *backgroundStyle ();
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68
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69 inline dw::core::style::Style *style () {
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70 dw::core::style::Style *s = stack->getRef (stack->size () - 1)->style;
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71 if (s)
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72 return s;
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73 else
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74 return style0 ();
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75 };
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76
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77 inline dw::core::style::Style *wordStyle () {
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78 dw::core::style::Style *s = stack->getRef(stack->size()-1)->wordStyle;
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79 if (s)
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80 return s;
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81 else
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82 return wordStyle0 ();
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83 };
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84 };
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85
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86 #endif