font.dart
4.74 KB
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/*
* Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
part of widget;
enum Type1Fonts {
courier,
courierBold,
courierBoldOblique,
courierOblique,
helvetica,
helveticaBold,
helveticaBoldOblique,
helveticaOblique,
times,
timesBold,
timesBoldItalic,
timesItalic,
symbol,
zapfDingbats
}
/// Lazy font declaration, registers the font in the document only if needed.
/// Tries to register a font only once
class Font {
Font() : font = null;
Font.type1(this.font) : assert(font != null);
factory Font.courier() => Font.type1(Type1Fonts.courier);
factory Font.courierBold() => Font.type1(Type1Fonts.courierBold);
factory Font.courierBoldOblique() =>
Font.type1(Type1Fonts.courierBoldOblique);
factory Font.courierOblique() => Font.type1(Type1Fonts.courierOblique);
factory Font.helvetica() => Font.type1(Type1Fonts.helvetica);
factory Font.helveticaBold() => Font.type1(Type1Fonts.helveticaBold);
factory Font.helveticaBoldOblique() =>
Font.type1(Type1Fonts.helveticaBoldOblique);
factory Font.helveticaOblique() => Font.type1(Type1Fonts.helveticaOblique);
factory Font.times() => Font.type1(Type1Fonts.times);
factory Font.timesBold() => Font.type1(Type1Fonts.timesBold);
factory Font.timesBoldItalic() => Font.type1(Type1Fonts.timesBoldItalic);
factory Font.timesItalic() => Font.type1(Type1Fonts.timesItalic);
factory Font.symbol() => Font.type1(Type1Fonts.symbol);
factory Font.zapfDingbats() => Font.type1(Type1Fonts.zapfDingbats);
final Type1Fonts font;
@protected
PdfFont buildFont(PdfDocument pdfDocument) {
const Map<Type1Fonts, String> type1Map = <Type1Fonts, String>{
Type1Fonts.courier: 'Courier',
Type1Fonts.courierBold: 'Courier-Bold',
Type1Fonts.courierBoldOblique: 'Courier-BoldOblique',
Type1Fonts.courierOblique: 'Courier-Oblique',
Type1Fonts.helvetica: 'Helvetica',
Type1Fonts.helveticaBold: 'Helvetica-Bold',
Type1Fonts.helveticaBoldOblique: 'Helvetica-BoldOblique',
Type1Fonts.helveticaOblique: 'Helvetica-Oblique',
Type1Fonts.times: 'Times-Roman',
Type1Fonts.timesBold: 'Times-Bold',
Type1Fonts.timesBoldItalic: 'Times-BoldItalic',
Type1Fonts.timesItalic: 'Times-Italic',
Type1Fonts.symbol: 'Symbol',
Type1Fonts.zapfDingbats: 'ZapfDingbats'
};
final String fontName = type1Map[font];
final PdfFont existing = pdfDocument.fonts.firstWhere(
(PdfFont font) => font.subtype == '/Type1' && font.fontName == fontName,
orElse: () => null,
);
if (existing != null) {
return existing;
}
switch (font) {
case Type1Fonts.courier:
return PdfFont.courier(pdfDocument);
case Type1Fonts.courierBold:
return PdfFont.courierBold(pdfDocument);
case Type1Fonts.courierBoldOblique:
return PdfFont.courierBoldOblique(pdfDocument);
case Type1Fonts.courierOblique:
return PdfFont.courierOblique(pdfDocument);
case Type1Fonts.helvetica:
return PdfFont.helvetica(pdfDocument);
case Type1Fonts.helveticaBold:
return PdfFont.helveticaBold(pdfDocument);
case Type1Fonts.helveticaBoldOblique:
return PdfFont.helveticaBoldOblique(pdfDocument);
case Type1Fonts.helveticaOblique:
return PdfFont.helveticaOblique(pdfDocument);
case Type1Fonts.times:
return PdfFont.times(pdfDocument);
case Type1Fonts.timesBold:
return PdfFont.timesBold(pdfDocument);
case Type1Fonts.timesBoldItalic:
return PdfFont.timesBoldItalic(pdfDocument);
case Type1Fonts.timesItalic:
return PdfFont.timesItalic(pdfDocument);
case Type1Fonts.symbol:
return PdfFont.symbol(pdfDocument);
case Type1Fonts.zapfDingbats:
return PdfFont.zapfDingbats(pdfDocument);
}
return PdfFont.helvetica(pdfDocument);
}
PdfFont _pdfFont;
PdfFont getFont(Context context) {
if (_pdfFont == null) {
final PdfDocument pdfDocument = context.document;
_pdfFont = buildFont(pdfDocument);
}
return _pdfFont;
}
}
class TtfFont extends Font {
TtfFont(this.data);
final ByteData data;
@override
PdfFont buildFont(PdfDocument pdfDocument) {
return PdfTtfFont(pdfDocument, data);
}
}