Add QTextMarkdownImporter

This provides the ability to read from a Markdown string or file into
a QTextDocument, such that the formatting will be recognized and can be
rendered.

- Add QTextDocument::setMarkdown(QString)
- Add QTextEdit::setMarkdown(QString)
- Add TextFormat::MarkdownText
- QWidgetTextControl::setContent() calls QTextDocument::setMarkdown()
  if that's the format

Fixes: QTBUG-72349
Change-Id: Ief2ad71bf840666c64145d58e9ca71d05fad5659
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>

1 files changed, 14 insertions, 1 deletions

diff --git a/src/gui/text/qtextdocument.h b/src/gui/text/qtextdocument.h
index c9b22e053b..ade67999ad 100644
--- a/src/gui/text/qtextdocument.h
+++ b/src/gui/text/qtextdocument.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtGui module of the Qt Toolkit.
@@ -151,6 +151,19 @@ public:
     void setHtml(const QString &html);
 #endif
 
+#if QT_CONFIG(textmarkdownreader)
+    // Must be in sync with QTextMarkdownImporter::Features, should be in sync with #define MD_FLAG_* in md4c
+    enum MarkdownFeature {
+        MarkdownNoHTML = 0x0020 | 0x0040,
+        MarkdownDialectCommonMark = 0,
+        MarkdownDialectGitHub = 0x0004 | 0x0008 | 0x0400 | 0x0100 | 0x0200 | 0x0800
+    };
+    Q_DECLARE_FLAGS(MarkdownFeatures, MarkdownFeature)
+    Q_FLAG(MarkdownFeatures)
+
+    void setMarkdown(const QString &markdown, MarkdownFeatures features = MarkdownDialectGitHub);
+#endif
+
     QString toRawText() const;
     QString toPlainText() const;
     void setPlainText(const QString &text);