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, true);
  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, true);
  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     visible = source.visible;
  33 }
  34
  35 Style::~Style() {
  36         if (aliasOfDefaultFont)
  37                 font.SetID(0);
  38         else
  39                 font.Release();
  40         aliasOfDefaultFont = false;
  41 }
  42
  43 Style &Style::operator=(const Style &source) {
  44         if (this == &source)
  45                 return *this;
  46         Clear(Colour(0,0,0), Colour(0xff,0xff,0xff),
  47                 0, 0, SC_CHARSET_DEFAULT,
  48                 false, false, false, false, true);
  49         fore.desired = source.fore.desired;
  50         back.desired = source.back.desired;
  51         characterSet = source.characterSet;
  52         bold = source.bold;
  53         italic = source.italic;
  54         size = source.size;
  55         eolFilled = source.eolFilled;
  56         underline = source.underline;
  57     visible = source.visible;
  58         return *this;
  59 }
  60
  61 void Style::Clear(Colour fore_, Colour back_, int size_,
  62         const char *fontName_, int characterSet_,
  63         bool bold_, bool italic_, bool eolFilled_, bool underline_, bool visible_) {
  64         fore.desired = fore_;
  65         back.desired = back_;
  66         characterSet = characterSet_;
  67         bold = bold_;
  68         italic = italic_;
  69         size = size_;
  70         fontName = fontName_;
  71         eolFilled = eolFilled_;
  72         underline = underline_;
  73     visible = visible_;
  74         if (aliasOfDefaultFont)
  75                 font.SetID(0);
  76         else
  77                 font.Release();
  78         aliasOfDefaultFont = false;
  79 }
  80
  81 bool Style::EquivalentFontTo(const Style *other) const {
  82         if (bold != other->bold ||
  83                 italic != other->italic ||
  84                 size != other->size ||
  85                 characterSet != other->characterSet)
  86                 return false;
  87         if (fontName == other->fontName)
  88                 return true;
  89         if (!fontName)
  90                 return false;
  91         if (!other->fontName)
  92                 return false;
  93         return strcmp(fontName, other->fontName) == 0;
  94 }
  95
  96 void Style::Realise(Surface &surface, int zoomLevel, Style *defaultStyle) {
  97         int sizeZoomed = size + zoomLevel;
  98         if (sizeZoomed <= 2)    // Hangs if sizeZoomed <= 1
  99                 sizeZoomed = 2;
 100
 101         if (aliasOfDefaultFont)
 102                 font.SetID(0);
 103         else
 104                 font.Release();
 105         int deviceHeight = surface.DeviceHeightFont(sizeZoomed);
 106         aliasOfDefaultFont = defaultStyle &&
 107                 (EquivalentFontTo(defaultStyle) || !fontName);
 108         if (aliasOfDefaultFont) {
 109                 font.SetID(defaultStyle->font.GetID());
 110         } else if (fontName) {
 111                 font.Create(fontName, characterSet, deviceHeight, bold, italic);
 112         } else {
 113                 font.SetID(0);
 114         }
 115
 116         ascent = surface.Ascent(font);
 117         descent = surface.Descent(font);
 118         // Probably more typographically correct to include leading
 119         // but that means more complex drawing as leading must be erased
 120         //lineHeight = surface.ExternalLeading() + surface.Height();
 121         externalLeading = surface.ExternalLeading(font);
 122         lineHeight = surface.Height(font);
 123         aveCharWidth = surface.AverageCharWidth(font);
 124         spaceWidth = surface.WidthChar(font, ' ');
 125 }