flutter_quill_to_pdf 1.1.0

Create PDF'S using deltas from Quill, with configurable attributes, fonts, and custom pdf widgets

Quill Delta to PDF

This package allows you to create PDFs using deltas from Quill.

You can configure:

• DeltaAttributesOptions (this are attributes that will appear in the delta if certain attributes are not found in the delta).
• The fonts that the PDF can use for your text.
• CustomConverter, which helps you create custom PDF widgets using custom regular expressions.
• Optional front matter and back matter.
• Even the page format using PDFPageFormat class.

By default, the delta when creating the document is processed by a local implementation that uses DeltaAttributesOptions to apply custom attributes, making it easier to add an attribute to the entire delta. If you want to create your own implementation or simply use a default delta, use PDFConverter(...params).createDocument(shouldProcessDeltas: false).

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Add dependencies

dependencies: 
    pdf: <latest_version>
    quill_to_pdf: ^1.1.0

Import package

import 'package:flutter_quill_to_pdf/flutter_quill_to_pdf.dart':

Personalize the settings of the page that will be printed (height,width,margins)

We can use two types differents constructors of the same PDFPageFormat class

The common, with all set params:

final PDFPageFormat pageFormat = PDFPageFormat(
   width: ..., //max width of the page
   height: ..., //max height of the page,
   marginTop: ..., 
   marginBottom: ...,
   marginLeft: ...,
   marginRight: ...,
);

The marginize all PDFPageFormat implementation

final PDFPageFormat pageFormat = PDFPageFormat.all(
   width: ..., //max width of the page
   height: ..., //max height of the page,
   margin: ..., //will set the property to the others margins
);

Configure delta to html options (optional)

This is a fragment from: vsc_quill_delta_to_html description (If you want to know more about these configs, and custom attributes rendering, visit his github)

We can configure a custom ConverterOptions using the param convertOptions from PDFConverter()

QuillDeltaToHtmlConverter accepts a few configuration (ConverterOptions, OpConverterOptions, and OpAttributeSanitizerOptions) options as shown below:

Option	Type	Default	Description
converterOptions.paragraphTag	string	'p'	Custom tag to wrap inline html elements
converterOptions.encodeHtml	boolean	true	If true, <, >, /, ', ", & characters in content will be encoded.
converterOptions.classPrefix	string	'ql'	A css class name to prefix class generating styles such as size, font, etc.
converterOptions.inlineStylesFlag	boolean	false	If true, use inline styles instead of classes.
converterOptions.inlineStyles	InlineStyles	null	If non-null, use inline styles instead of classes. See Rendering Inline Styles section below for usage.
multiLineBlockquote	boolean	true	Instead of rendering multiple blockquote elements for quotes that are consecutive and have same styles(align, indent, and direction), it renders them into only one
multiLineHeader	boolean	true	Same deal as multiLineBlockquote for headers
multiLineCodeblock	boolean	true	Same deal as multiLineBlockquote for code-blocks
multiLineParagraph	boolean	true	Set to false to generate a new paragraph tag after each enter press (new line)
multiLineCustomBlock	boolean	true	Same deal as multiLineBlockquote for custom blocks.
bulletListTag	string	'ul'	Tag for unordered bullet lists.
orderedListTag	string	'ol'	Tag for ordered/numbered lists.
converterOptions.linkRel	string	none generated	Specifies a value to put on the rel attr on all links. This can be overridden by an individual link op by specifying the rel attribute in the respective op's attributes
converterOptions.linkTarget	string	'_blank'	Specifies target for all links; use '' (empty string) to not generate target attribute. This can be overridden by an individual link op by specifiying the target with a value in the respective op's attributes.
converterOptions.allowBackgroundClasses	boolean	false	If true, css classes will be added for background attr
sanitizerOptions.urlSanitizer	String? Function(String url)	null	A function that is called once per url in the ops (image, video, link) for you to do custom sanitization. If your function returns a string, it is assumed that you sanitized the url and no further sanitization will be done by the library; when anything other than a string is returned (e.g. undefined), it is assumed that no sanitization has been done and the library's own function will be used to clean up the url
sanitizerOptions.allow8DigitHexColors	boolean	false	If true, hex colors in #AARRGGBB format are allowed in the ops
converterOptions.customTag	String? Function(String format, DeltaInsertOp op)	null	Callback allows to provide custom html tag for some format
converterOptions.customTagAttributes	Map<String, String>? Function(DeltaInsertOp op)	null	Allows custom html tag attributes for the given op
converterOptions.customCssClasses	List<String>? Function(DeltaInsertOp op)	null	Allows custom CSS classes for the given op
converterOptions.customCssStyles	List<String>? Function(DeltaInsertOp op)	null	Allows custom CSS styles attributes for the given op

Configuring custom markdown rules (optional)

You can set custom rules using

//By default is null, and it will throws error if rules are empty
PDFConverter(..., customRules: [...your custom rules]);

This is a fragment from html2md package documentation

Custom Rules

Want to customize element converting? Write your rules!

Rule fields explaination

final String name; // unique rule name
final List<String>? filters; // simple element name filters, e.g. ['aside']
final FilterFn? filterFn; // function for building complex element filter logic
final Replacement? replacement; // function for doing the replacing
final Append? append; // function for appending content

Rule example - Convert the onebox section of discourse post to a link

<aside class="onebox">
  <header class="source">
      <img src="https://discoursesite/uploads/default/original/1X/test.png" class="site-icon" width="32" height="32">
      <a href="https://events.google.com/io/program/content?4=topic_flutter&amp;lng=zh-CN" target="_blank" rel="noopener">Google I/O 2021</a>
  </header>
</aside>

Rule(
  'discourse-onebox',
  filterFn: (node) {
    // Find aside with onebox class
    if (node.nodeName == 'aside' &&
        node.className.contains('onebox')) {
        return true;
    }
    return false;
  },
  replacement: (content, node) {
    // find the first a element under header
    var header = node.firstChild;
    var link = header!
        .childNodes()
        .firstWhere((element) => element.nodeName == 'a');
    var href = link.getAttribute('href');
    if (href != null && href.isNotEmpty) {
      return '[$href]($href)'; // build the link
    }
    return '';
  },
)

Using pdf converter and required params

PDFConverter pdfConverter = PDFConverter(
    backMatterDelta: null,
    frontMatterDelta: null,
    customConverters: [],
    document: _quillController.document.toDelta(),
    fallbacks: [...your global fonts],
    onRequestBoldFont: (String fontFamily) async {
       ...your local font implementation
    },
    onRequestBoldItalicFont: (String fontFamily) async {
       ...your local font implementation
    },
    onRequestFallbackFont: (String fontFamily) async {
       ...your local font implementation
    },
    onRequestItalicFont: (String fontFamily) async {
       ...your local font implementation
    },
    onRequestFont: (String fontFamily) async {
       ...your local font implementation
    },
    params: pageFormat,
);

We can use a document create method

final pw.Document? document = await pdfConverter.createDocument();

Or just use this, that creates PDF document and writed in the selected file path

await pdfConverter.createDocumentFile(path: filepath, ...other optional params);

Suppoted

• font family
• size
• bold
• italic
• underline
• Link
• line-height (custom attribute used from this package)
• Align
• Embed image (File path yet)
• Header
• List (check, bullet, ordered)

Not support yet

• Images links
• Code block
• Blockquote
• text Color
• background color
• indented text,
• indented list (bullet, unordered, check)
• formula

You can contribute reporting issues or requesting to add new features in: https://github.com/CatHood0/quill_to_pdf