contrib/src/stc/scintilla/src/Style.cxx

   1 // Scintilla source code edit control
   2 // Style.cxx - defines the font and colour style for a class of text
   3 // Copyright 1998-2000 by Neil Hodgson <neilh@scintilla.org>
   4 // The License.txt file describes the conditions under which this software may be distributed.
   5
   6 #include <string.h>
   7
   8 #include "Platform.h"
   9
  10 #include "Scintilla.h"
  11 #include "Style.h"
  12
  13 Style::Style() {
  14         aliasOfDefaultFont = true;
  15         Clear(Colour(0,0,0), Colour(0xff,0xff,0xff),
  16                 Platform::DefaultFontSize(), 0, SC_CHARSET_DEFAULT,
  17                 false, false, false, false);
  18 }
  19
  20 Style::Style(const Style &source) {
  21         Clear(Colour(0,0,0), Colour(0xff,0xff,0xff),
  22                 0, 0, 0,
  23                 false, false, false, false);
  24         fore.desired = source.fore.desired;
  25         back.desired = source.back.desired;
  26         characterSet = source.characterSet;
  27         bold = source.bold;
  28         italic = source.italic;
  29         size = source.size;
  30         eolFilled = source.eolFilled;
  31         underline = source.underline;
  32 }
  33
  34 Style::~Style() {
  35         if (aliasOfDefaultFont)
  36                 font.SetID(0);
  37         else
  38                 font.Release();
  39         aliasOfDefaultFont = false;
  40 }
  41
  42 Style &Style::operator=(const Style &source) {
  43         if (this == &source)
  44                 return *this;
  45         Clear(Colour(0,0,0), Colour(0xff,0xff,0xff),
  46                 0, 0, SC_CHARSET_DEFAULT,
  47                 false, false, false, false);
  48         fore.desired = source.fore.desired;
  49         back.desired = source.back.desired;
  50         characterSet = source.characterSet;
  51         bold = source.bold;
  52         italic = source.italic;
  53         size = source.size;
  54         eolFilled = source.eolFilled;
  55         underline = source.underline;
  56         return *this;
  57 }
  58
  59 void Style::Clear(Colour fore_, Colour back_, int size_,
  60         const char *fontName_, int characterSet_,
  61         bool bold_, bool italic_, bool eolFilled_, bool underline_) {
  62         fore.desired = fore_;
  63         back.desired = back_;
  64         characterSet = characterSet_;
  65         bold = bold_;
  66         italic = italic_;
  67         size = size_;
  68         fontName = fontName_;
  69         eolFilled = eolFilled_;
  70         underline = underline_;
  71         if (aliasOfDefaultFont)
  72                 font.SetID(0);
  73         else
  74                 font.Release();
  75         aliasOfDefaultFont = false;
  76 }
  77
  78 bool Style::EquivalentFontTo(const Style *other) const {
  79         if (bold != other->bold ||
  80                 italic != other->italic ||
  81                 size != other->size ||
  82                 characterSet != other->characterSet)
  83                 return false;
  84         if (fontName == other->fontName)
  85                 return true;
  86         if (!fontName)
  87                 return false;
  88         if (!other->fontName)
  89                 return false;
  90         return strcmp(fontName, other->fontName) == 0;
  91 }
  92
  93 void Style::Realise(Surface &surface, int zoomLevel, Style *defaultStyle) {
  94         int sizeZoomed = size + zoomLevel;
  95         if (sizeZoomed <= 2)    // Hangs if sizeZoomed <= 1
  96                 sizeZoomed = 2;
  97
  98         if (aliasOfDefaultFont)
  99                 font.SetID(0);
 100         else
 101                 font.Release();
 102         int deviceHeight = surface.DeviceHeightFont(sizeZoomed);
 103         aliasOfDefaultFont = defaultStyle &&
 104                 (EquivalentFontTo(defaultStyle) || !fontName);
 105         if (aliasOfDefaultFont) {
 106                 font.SetID(defaultStyle->font.GetID());
 107         } else if (fontName) {
 108                 font.Create(fontName, characterSet, deviceHeight, bold, italic);
 109         } else {
 110                 font.SetID(0);
 111         }
 112
 113         ascent = surface.Ascent(font);
 114         descent = surface.Descent(font);
 115         // Probably more typographically correct to include leading
 116         // but that means more complex drawing as leading must be erased
 117         //lineHeight = surface.ExternalLeading() + surface.Height();
 118         externalLeading = surface.ExternalLeading(font);
 119         lineHeight = surface.Height(font);
 120         aveCharWidth = surface.AverageCharWidth(font);
 121         spaceWidth = surface.WidthChar(font, ' ');
 122 }