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 "Style.h"
  11
  12 Style::Style() {
  13         aliasOfDefaultFont = true;
  14         Clear(Colour(0,0,0), Colour(0xff,0xff,0xff),
  15                 Platform::DefaultFontSize(), 0,
  16                 false, false, false);
  17 }
  18
  19 Style::~Style() {
  20         if (aliasOfDefaultFont)
  21                 font.SetID(0);
  22         else
  23                 font.Release();
  24         aliasOfDefaultFont = false;
  25 }
  26
  27 Style &Style::operator=(const Style &source) {
  28         if (this == &source)
  29                 return *this;
  30         Clear(Colour(0,0,0), Colour(0xff,0xff,0xff),
  31                 0, 0,
  32                 false, false, false);
  33         fore.desired = source.fore.desired;
  34         back.desired = source.back.desired;
  35         bold = source.bold;
  36         italic = source.italic;
  37         size = source.size;
  38         eolFilled = source.eolFilled;
  39         return *this;
  40 }
  41
  42 void Style::Clear(Colour fore_, Colour back_, int size_, const char *fontName_,
  43         bool bold_, bool italic_, bool eolFilled_) {
  44         fore.desired = fore_;
  45         back.desired = back_;
  46         bold = bold_;
  47         italic = italic_;
  48         size = size_;
  49         fontName = fontName_;
  50         eolFilled = eolFilled_;
  51         if (aliasOfDefaultFont)
  52                 font.SetID(0);
  53         else
  54                 font.Release();
  55         aliasOfDefaultFont = false;
  56 }
  57
  58 bool Style::EquivalentFontTo(const Style *other) const {
  59         if (bold != other->bold ||
  60                 italic != other->italic ||
  61                 size != other->size)
  62                 return false;
  63         if (fontName == other->fontName)
  64                 return true;
  65         if (!fontName)
  66                 return false;
  67         if (!other->fontName)
  68                 return false;
  69         return strcmp(fontName, other->fontName) == 0;
  70 }
  71
  72 void Style::Realise(Surface &surface, int zoomLevel, Style *defaultStyle) {
  73         int sizeZoomed = size + zoomLevel;
  74         if (sizeZoomed <= 2)    // Hangs if sizeZoomed <= 1
  75                 sizeZoomed = 2;
  76
  77         if (aliasOfDefaultFont)
  78                 font.SetID(0);
  79         else
  80                 font.Release();
  81         int deviceHeight = (sizeZoomed * surface.LogPixelsY()) / 72;
  82         aliasOfDefaultFont = defaultStyle &&
  83                 (EquivalentFontTo(defaultStyle) || !fontName);
  84         if (aliasOfDefaultFont) {
  85                 font.SetID(defaultStyle->font.GetID());
  86         } else if (fontName) {
  87                 font.Create(fontName, deviceHeight, bold, italic);
  88         } else {
  89                 font.SetID(0);
  90         }
  91
  92         ascent = surface.Ascent(font);
  93         descent = surface.Descent(font);
  94         // Probably more typographically correct to include leading
  95         // but that means more complex drawing as leading must be erased
  96         //lineHeight = surface.ExternalLeading() + surface.Height();
  97         externalLeading = surface.ExternalLeading(font);
  98         lineHeight = surface.Height(font);
  99         aveCharWidth = surface.AverageCharWidth(font);
 100         spaceWidth = surface.WidthChar(font, ' ');
 101 }