scintilla/Style.cxx

   1 // Scintilla source code edit control
   2 /** @file Style.cxx
   3  ** Defines the font and colour style for a class of text.
   4  **/
   5 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <string.h>
   9
  10 #include "Platform.h"
  11
  12 #include "Scintilla.h"
  13 #include "Style.h"
  14
  15 #ifdef SCI_NAMESPACE
  16 using namespace Scintilla;
  17 #endif
  18
  19 Style::Style() {
  20         aliasOfDefaultFont = true;
  21         Clear(ColourDesired(0, 0, 0), ColourDesired(0xff, 0xff, 0xff),
  22               Platform::DefaultFontSize(), 0, SC_CHARSET_DEFAULT,
  23               false, false, false, false, caseMixed, true, true, false);
  24 }
  25
  26 Style::Style(const Style &source) {
  27         Clear(ColourDesired(0, 0, 0), ColourDesired(0xff, 0xff, 0xff),
  28               0, 0, 0,
  29               false, false, false, false, caseMixed, true, true, false);
  30         fore.desired = source.fore.desired;
  31         back.desired = source.back.desired;
  32         characterSet = source.characterSet;
  33         bold = source.bold;
  34         italic = source.italic;
  35         size = source.size;
  36         eolFilled = source.eolFilled;
  37         underline = source.underline;
  38         caseForce = source.caseForce;
  39         visible = source.visible;
  40         changeable = source.changeable;
  41         hotspot = source.hotspot;
  42 }
  43
  44 Style::~Style() {
  45         if (aliasOfDefaultFont)
  46                 font.SetID(0);
  47         else
  48                 font.Release();
  49         aliasOfDefaultFont = false;
  50 }
  51
  52 Style &Style::operator=(const Style &source) {
  53         if (this == &source)
  54                 return * this;
  55         Clear(ColourDesired(0, 0, 0), ColourDesired(0xff, 0xff, 0xff),
  56               0, 0, SC_CHARSET_DEFAULT,
  57               false, false, false, false, caseMixed, true, true, false);
  58         fore.desired = source.fore.desired;
  59         back.desired = source.back.desired;
  60         characterSet = source.characterSet;
  61         bold = source.bold;
  62         italic = source.italic;
  63         size = source.size;
  64         eolFilled = source.eolFilled;
  65         underline = source.underline;
  66         caseForce = source.caseForce;
  67         visible = source.visible;
  68         changeable = source.changeable;
  69         return *this;
  70 }
  71
  72 void Style::Clear(ColourDesired fore_, ColourDesired back_, int size_,
  73                   const char *fontName_, int characterSet_,
  74                   bool bold_, bool italic_, bool eolFilled_,
  75                   bool underline_, ecaseForced caseForce_,
  76                   bool visible_, bool changeable_, bool hotspot_) {
  77         fore.desired = fore_;
  78         back.desired = back_;
  79         characterSet = characterSet_;
  80         bold = bold_;
  81         italic = italic_;
  82         size = size_;
  83         fontName = fontName_;
  84         eolFilled = eolFilled_;
  85         underline = underline_;
  86         caseForce = caseForce_;
  87         visible = visible_;
  88         changeable = changeable_;
  89         hotspot = hotspot_;
  90         if (aliasOfDefaultFont)
  91                 font.SetID(0);
  92         else
  93                 font.Release();
  94         aliasOfDefaultFont = false;
  95 }
  96
  97 void Style::ClearTo(const Style &source) {
  98         Clear(
  99                 source.fore.desired,
 100                 source.back.desired,
 101                 source.size,
 102                 source.fontName,
 103                 source.characterSet,
 104                 source.bold,
 105                 source.italic,
 106                 source.eolFilled,
 107                 source.underline,
 108                 source.caseForce,
 109                 source.visible,
 110                 source.changeable,
 111                 source.hotspot);
 112 }
 113
 114 bool Style::EquivalentFontTo(const Style *other) const {
 115         if (bold != other->bold ||
 116                 italic != other->italic ||
 117                 size != other->size ||
 118                 characterSet != other->characterSet)
 119                 return false;
 120         if (fontName == other->fontName)
 121                 return true;
 122         if (!fontName)
 123                 return false;
 124         if (!other->fontName)
 125                 return false;
 126         return strcmp(fontName, other->fontName) == 0;
 127 }
 128
 129 void Style::Realise(Surface &surface, int zoomLevel, Style *defaultStyle, int extraFontFlag) {
 130         sizeZoomed = size + zoomLevel;
 131         if (sizeZoomed <= 2)    // Hangs if sizeZoomed <= 1
 132                 sizeZoomed = 2;
 133
 134         if (aliasOfDefaultFont)
 135                 font.SetID(0);
 136         else
 137                 font.Release();
 138         int deviceHeight = surface.DeviceHeightFont(sizeZoomed);
 139         aliasOfDefaultFont = defaultStyle &&
 140                              (EquivalentFontTo(defaultStyle) || !fontName);
 141         if (aliasOfDefaultFont) {
 142                 font.SetID(defaultStyle->font.GetID());
 143         } else if (fontName) {
 144                 font.Create(fontName, characterSet, deviceHeight, bold, italic, extraFontFlag);
 145         } else {
 146                 font.SetID(0);
 147         }
 148
 149         ascent = surface.Ascent(font);
 150         descent = surface.Descent(font);
 151         // Probably more typographically correct to include leading
 152         // but that means more complex drawing as leading must be erased
 153         //lineHeight = surface.ExternalLeading() + surface.Height();
 154         externalLeading = surface.ExternalLeading(font);
 155         lineHeight = surface.Height(font);
 156         aveCharWidth = surface.AverageCharWidth(font);
 157         spaceWidth = surface.WidthChar(font, ' ');
 158 }