Markdown and HTML: support image alt text and title

It's a required CommonMark feature:
https://spec.commonmark.org/0.29/#images
and alt text is also required in HTML:
https://www.w3.org/wiki/Html/Elements/img#Requirements_for_providing_text_to_act_as_an_alternative_for_images
Now we are able to read these attributes from either html or markdown
and rewrite either an html or markdown document that preserves them.

This patch does not add viewing or editing support in QTextEdit etc.

Change-Id: I51307389f8f9fc00809808390e583a83111a7b33
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
 
 
 
 
 
 
 
 

1 files changed, 9 insertions, 1 deletions

diff --git a/src/gui/text/qtextmarkdownwriter.cpp b/src/gui/text/qtextmarkdownwriter.cpp
index 02643acdca..58e0c86b95 100644
--- a/src/gui/text/qtextmarkdownwriter.cpp
+++ b/src/gui/text/qtextmarkdownwriter.cpp
@@ -55,6 +55,7 @@ Q_LOGGING_CATEGORY(lcMDW, "qt.text.markdown.writer")
 static const QChar Space = QLatin1Char(' ');
 static const QChar Newline = QLatin1Char('\n');
 static const QChar LineBreak = QChar(0x2028);
+static const QChar DoubleQuote = QLatin1Char('"');
 static const QChar Backtick = QLatin1Char('`');
 static const QChar Period = QLatin1Char('.');
 
@@ -372,7 +373,14 @@ int QTextMarkdownWriter::writeBlock(const QTextBlock &block, bool wrap, bool ign
         QTextCharFormat fmt = frag.fragment().charFormat();
         if (fmt.isImageFormat()) {
             QTextImageFormat ifmt = fmt.toImageFormat();
-            QString s = QLatin1String("![image](") + ifmt.name() + QLatin1Char(')');
+            QString desc = ifmt.stringProperty(QTextFormat::ImageAltText);
+            if (desc.isEmpty())
+                desc = QLatin1String("image");
+            QString s = QLatin1String("![") + desc + QLatin1String("](") + ifmt.name();
+            QString title = ifmt.stringProperty(QTextFormat::ImageTitle);
+            if (!title.isEmpty())
+                s += Space + DoubleQuote + title + DoubleQuote;
+            s += QLatin1Char(')');
             if (wrap && col + s.length() > ColumnLimit) {
                 m_stream << Newline << wrapIndentString;
                 col = m_wrappedLineIndent;