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Bug 1392996 - Part 1 - Add meta viewport tag to view-source document. r=hsivonen 

Adding <meta name="viewport" content="width=device-width"/> to the view-source
document achieves two things when used in a mobile browser, such as Fennec:
1. When word-wrapping is turned off, the page displays at a more readable
   initial zoom level.
2. As of now, font inflation (when enabled) kicks in on the document when word-
   wrapping is turned on, which leads to the line numbers appearing in a
   noticeably smaller font size than the rest of the page.
   Adding the above meta viewport header marks the document as "mobile-friendly"
   and suppresses font inflation, which means that line numbers will appear
   normally even with word-wrapping enabled.

getMathMLSelection() in browser-content.js isn't actually used in Fennec at the
moment, but for consistency we add the meta viewport tag there as well.

MozReview-Commit-ID: K9KVHh7g7TF

--HG--
extra : rebase_source : 1054f712f5420efcd89daeaa2c8c200129544b2a
This commit is contained in:
Jan Henning 2018-01-23 22:25:09 +01:00
Родитель ab3df91217
Коммит 9c467e7e8d
5 изменённых файлов: 25 добавлений и 1 удалений
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5
parser/html/nsHtml5Highlighter.cpp
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@ -89,6 +89,11 @@ nsHtml5Highlighter::Start(const nsAutoString& aTitle)
// <head> uses NS_NewHTMLSharedElement creator
Push(nsGkAtoms::head, nullptr, NS_NewHTMLSharedElement);
Push(nsGkAtoms::meta,
nsHtml5ViewSourceUtils::NewMetaViewportAttributes(),
NS_NewHTMLMetaElement);
Pop(); // meta
Push(nsGkAtoms::title, nullptr, NS_NewHTMLTitleElement);
// XUL will add the "Source of: " prefix.
uint32_t length = aTitle.Length();

5
parser/html/nsHtml5TreeBuilderCppSupplement.h
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@ -1315,6 +1315,11 @@ void
nsHtml5TreeBuilder::StartPlainTextViewSource(const nsAutoString& aTitle)
{
MOZ_ASSERT(!mBuilder, "Must not view source with builder.");
startTag(nsHtml5ElementName::ELT_META,
nsHtml5ViewSourceUtils::NewMetaViewportAttributes(),
false);
startTag(nsHtml5ElementName::ELT_TITLE,
nsHtml5HtmlAttributes::EMPTY_ATTRIBUTES,
false);

12
parser/html/nsHtml5ViewSourceUtils.cpp
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@ -54,3 +54,15 @@ nsHtml5ViewSourceUtils::NewLinkAttributes()
linkAttrs->addAttribute(nsHtml5AttributeName::ATTR_HREF, href, -1);
return linkAttrs;
}
// static
nsHtml5HtmlAttributes*
nsHtml5ViewSourceUtils::NewMetaViewportAttributes()
{
nsHtml5HtmlAttributes* metaVpAttrs = new nsHtml5HtmlAttributes(0);
nsHtml5String name = nsHtml5Portability::newStringFromLiteral("viewport");
metaVpAttrs->addAttribute(nsHtml5AttributeName::ATTR_NAME, name, -1);
nsHtml5String content = nsHtml5Portability::newStringFromLiteral("width=device-width");
metaVpAttrs->addAttribute(nsHtml5AttributeName::ATTR_CONTENT, content, -1);
return metaVpAttrs;
}

1
parser/html/nsHtml5ViewSourceUtils.h
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@ -12,6 +12,7 @@ class nsHtml5ViewSourceUtils
public:
static nsHtml5HtmlAttributes* NewBodyAttributes();
static nsHtml5HtmlAttributes* NewLinkAttributes();
static nsHtml5HtmlAttributes* NewMetaViewportAttributes();
};
#endif // nsHtml5ViewSourceUtils_h

3
toolkit/content/browser-content.js
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@ -1402,7 +1402,8 @@ var ViewSelectionSource = {
var source =
"<!DOCTYPE html>"
+ "<html>"
+ "<head><title>" + title + "</title>"
+ '<head><meta name="viewport" content="width=device-width"/>'
+ "<title>" + title + "</title>"
+ '<link rel="stylesheet" type="text/css" href="' + VIEW_SOURCE_CSS + '">'
+ '<style type="text/css">'
+ "#target { border: dashed 1px; background-color: lightyellow; }"