Esempio n. 1
0
        internal static UIFont BestFont(string family, nfloat size, bool bold = false, bool italic = false, Assembly assembly = null)
        {
            if (family == null)
            {
                family = "sans-serif";
            }
            if (family.ToLower() == "monospace")
            {
                family = "Menlo";
            }
            if (family.ToLower() == "serif")
            {
                family = "Times New Roman";
            }
            if (family.ToLower() == "sans-serif")
            {
                family = "Arial";
            }

            if (size < 0)
            {
                size = (nfloat)(UIFont.LabelFontSize * Math.Abs(size));
            }


            // is it in the cache?
            var key = new FontKey(family, size, bold, italic);
            Dictionary <FontKey, UIFont> dictionary = UiFontCache;

            lock (dictionary)
            {
                if (dictionary.TryGetValue(key, out UIFont storedUiFont))
                {
                    return(storedUiFont);
                }
            }


            UIFont bestAttemptFont = null;

            if (UIFont.FamilyNames.Contains(family))
            {
                // a system font
                var    fontNames    = FontFamilies.FontsForFamily(family);
                string baseFontName = null;
                string reqFontName  = null;
                //string fallbackFontName = null;


                if (fontNames != null && fontNames.Count > 0)
                {
                    if (fontNames.Count == 1)
                    {
                        baseFontName = fontNames[0];
                        if (!bold && !italic)
                        {
                            reqFontName = fontNames[0];
                        }
                    }
                    else
                    {
                        int shortestMatchLength = int.MaxValue;
                        int shortestBaseLength  = int.MaxValue;
                        foreach (var fontName in fontNames)
                        {
                            var  lowerName     = fontName.ToLower();
                            bool nameHasBold   = lowerName.Contains("bold") || lowerName == "avenir-black";
                            bool nameHasItalic = lowerName.Contains("italic") || lowerName.Contains("oblique");
                            // assume the shortest name is the base font name
                            if (lowerName.Length < shortestBaseLength)
                            {
                                baseFontName       = fontName;
                                shortestBaseLength = lowerName.Length;
                            }

                            // assume the shortest name with matching attributes is a match
                            if (nameHasBold == bold && nameHasItalic == italic && lowerName.Length < shortestMatchLength)
                            {
                                reqFontName         = fontName;
                                shortestMatchLength = lowerName.Length;
                            }

                            if (lowerName.Contains("-regular"))
                            {
                                baseFontName       = fontName;
                                shortestBaseLength = -1;
                                if (!bold && !italic)
                                {
                                    reqFontName         = fontName;
                                    shortestMatchLength = -1;
                                    break;
                                }
                            }
                        }
                    }
                }

                if (reqFontName != null)
                {
                    bestAttemptFont = UIFont.FromName(reqFontName, size);
                }
                if (bestAttemptFont == null && baseFontName != null && !bold && !italic)
                {
                    bestAttemptFont = UIFont.FromName(baseFontName, size);
                }
            }
            else
            {
                //  an embedded font or a explicitly named system font?
                bestAttemptFont = EmbeddedFont(family, size, assembly);

                if (bestAttemptFont == null)
                {
                    bestAttemptFont = UIFont.FromName(family, size);
                }
            }

            if (bestAttemptFont != null)
            {
                // we have a match but is wasn't cached - so let's cache it for future reference
                lock (dictionary)
                {
                    if (!dictionary.TryGetValue(key, out UIFont storedUiFont))
                    {
                        // It could have been added by another thread so only add if we're really sure it's no there!
                        dictionary.Add(key, bestAttemptFont);
                    }
                }
                return(bestAttemptFont);
            }

            // fall back to a system font
            if (bold && italic)
            {
                UIFont systemFont = UIFont.SystemFontOfSize(size);
                var    descriptor = systemFont.FontDescriptor.CreateWithTraits(UIFontDescriptorSymbolicTraits.Bold | UIFontDescriptorSymbolicTraits.Italic);
                bestAttemptFont = UIFont.FromDescriptor(descriptor, size);
            }
            if (bestAttemptFont == null && italic)
            {
                bestAttemptFont = UIFont.ItalicSystemFontOfSize(size);
            }
            if (bestAttemptFont == null && bold)
            {
                bestAttemptFont = UIFont.BoldSystemFontOfSize(size);
            }
            if (bestAttemptFont == null)
            {
                bestAttemptFont = UIFont.SystemFontOfSize(size);
            }
            return(bestAttemptFont);
        }
Esempio n. 2
0
        internal static UIFont BestFont(string family, nfloat size, bool bold = false, bool italic = false, Assembly assembly = null)
        {
            if (family == null)
            {
                family = ".AppleSystemUIFont";
            }
            if (family.ToLower() == "monospace")
            {
                family = "Menlo";
            }
            if (family.ToLower() == "serif")
            {
                family = "Times New Roman";
            }
            if (family.ToLower() == "sans-serif")
            {
                family = ".AppleSystemUIFont";
            }

            if (size < 0)
            {
                size = (nfloat)(UIFont.LabelFontSize * Math.Abs(size));
            }


            // is it in the cache?
            var key = new FontKey(family, size, bold, italic);
            Dictionary <FontKey, UIFont> dictionary = UiFontCache;

            lock (dictionary)
            {
                if (dictionary.TryGetValue(key, out UIFont storedUiFont))
                {
                    return(storedUiFont);
                }
            }

            UIFont bestAttemptFont = null;

            if (UIFont.FamilyNames.Contains(family))
            {
                // a system font
                var    fontNames    = FontFamilies.FontsForFamily(family);
                string baseFontName = null;
                string reqFontName  = null;
                //string fallbackFontName = null;


                if (fontNames != null && fontNames.Count > 0)
                {
                    if (fontNames.Count == 1)
                    {
                        baseFontName = fontNames[0];
                        if (!bold && !italic)
                        {
                            reqFontName = fontNames[0];
                        }
                    }
                    else
                    {
                        int shortestMatchLength = int.MaxValue;
                        int shortestBaseLength  = int.MaxValue;
                        foreach (var fontName in fontNames)
                        {
                            var  lowerName     = fontName.ToLower();
                            bool nameHasBold   = lowerName.Contains("bold") || lowerName == "avenir-black";
                            bool nameHasItalic = lowerName.Contains("italic") || lowerName.Contains("oblique");
                            // assume the shortest name is the base font name
                            if (lowerName.Length < shortestBaseLength)
                            {
                                baseFontName       = fontName;
                                shortestBaseLength = lowerName.Length;
                            }

                            // assume the shortest name with matching attributes is a match
                            if (nameHasBold == bold && nameHasItalic == italic && lowerName.Length < shortestMatchLength)
                            {
                                reqFontName         = fontName;
                                shortestMatchLength = lowerName.Length;
                            }

                            if (lowerName.Contains("-regular"))
                            {
                                baseFontName       = fontName;
                                shortestBaseLength = -1;
                                if (!bold && !italic)
                                {
                                    reqFontName         = fontName;
                                    shortestMatchLength = -1;
                                    break;
                                }
                            }
                        }
                    }
                }

                if (reqFontName != null)
                {
                    bestAttemptFont = UIFont.FromName(reqFontName, size);
                }
                if (bestAttemptFont == null && baseFontName != null && !bold && !italic)
                {
                    bestAttemptFont = UIFont.FromName(baseFontName, size);
                }
            }
            else
            {
                //  an embedded font or a explicitly named system font?
                bestAttemptFont = EmbeddedFont(family, size, assembly);

                if (bestAttemptFont == null && !family.StartsWith(".SFUI"))
                {
                    bestAttemptFont = UIFont.FromName(family, size);
                }
            }

            if (bestAttemptFont != null)
            {
                if (bold || italic)
                {
                    if (bestAttemptFont.FontDescriptor.CreateWithTraits(
                            (bold ? UIFontDescriptorSymbolicTraits.Bold : UIFontDescriptorSymbolicTraits.ClassUnknown)
                            |
                            (italic ? UIFontDescriptorSymbolicTraits.Italic : UIFontDescriptorSymbolicTraits.ClassUnknown)
                            ) is UIFontDescriptor descriptor)
                    {
                        bestAttemptFont = UIFont.FromDescriptor(descriptor, size);
                    }
                }

                // we have a match but is wasn't cached - so let's cache it for future reference
                lock (dictionary)
                {
                    if (!dictionary.TryGetValue(key, out UIFont storedUiFont))
                    {
                        // It could have been added by another thread so only add if we're really sure it's no there!
                        dictionary.Add(key, bestAttemptFont);
                    }
                }
                return(bestAttemptFont);
            }

            UIFontWeight fontWeight = UIFontWeight.Regular;

            if (family.StartsWith(".SFUI"))
            {
                var parts = family.Split("-");
                if (parts.Length > 1)
                {
                    var weightText = parts[1];
                    switch (weightText)
                    {
                    case nameof(UIFontWeight.Black):
                        fontWeight = UIFontWeight.Black;
                        break;

                    case nameof(UIFontWeight.Bold):
                        fontWeight = UIFontWeight.Bold;
                        break;

                    case nameof(UIFontWeight.Heavy):
                        fontWeight = UIFontWeight.Heavy;
                        break;

                    case nameof(UIFontWeight.Light):
                        fontWeight = UIFontWeight.Light;
                        break;

                    case nameof(UIFontWeight.Medium):
                        fontWeight = UIFontWeight.Medium;
                        break;

                    case nameof(UIFontWeight.Regular):
                        fontWeight = UIFontWeight.Medium;
                        break;

                    case nameof(UIFontWeight.Semibold):
                        fontWeight = UIFontWeight.Semibold;
                        break;

                    case nameof(UIFontWeight.Thin):
                        fontWeight = UIFontWeight.Thin;
                        break;

                    case nameof(UIFontWeight.UltraLight):
                        fontWeight = UIFontWeight.UltraLight;
                        break;

                    default:
                        fontWeight = UIFontWeight.Regular;
                        break;
                    }
                }
                // fall back to a system font
            }
            // fall back to a system font
            if (bold && italic || (fontWeight != UIFontWeight.Regular && (bold || italic)))
            {
                UIFont systemFont = UIFont.SystemFontOfSize(size, fontWeight);
                UIFontDescriptorSymbolicTraits traits = (bold ? UIFontDescriptorSymbolicTraits.Bold : (UIFontDescriptorSymbolicTraits)0) | (italic ? UIFontDescriptorSymbolicTraits.Italic : (UIFontDescriptorSymbolicTraits)0);
                var descriptor = systemFont.FontDescriptor.CreateWithTraits(traits);
                bestAttemptFont = UIFont.FromDescriptor(descriptor, size);
            }
            if (bestAttemptFont == null && italic)
            {
                bestAttemptFont = UIFont.ItalicSystemFontOfSize(size);
            }
            if (bestAttemptFont == null && bold)
            {
                bestAttemptFont = UIFont.BoldSystemFontOfSize(size);
            }
            if (bestAttemptFont == null)
            {
                bestAttemptFont = UIFont.SystemFontOfSize(size, fontWeight);
            }
            return(bestAttemptFont);
        }