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LibWeb: Implement BrowsingContext::selected_text() in terms of Selection

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Instead of sifting through the layout tree to extract the selected text,
look at the DOM selection instead.

Note that we can't just stringify the DOM Range, as that would include
non-visible things (like the content of <style> elements, etc.) so we
run it through an ad-hoc variant of the range stringification algorithm.
This can probably be factored better, but it's a start. :^)
This commit is contained in:
Andreas Kling 2023-01-11 19:47:38 +01:00
parent 3cabd17f9b
commit bf69f4370e
Notes: sideshowbarker 2024-07-17 01:48:05 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/bf69f4370e
Pull-request: https://github.com/SerenityOS/serenity/pull/16966
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/emanuele6
Reviewed-by: https://github.com/linusg ✅
2 changed files with 29 additions and 37 deletions
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3
Userland/Libraries/LibWeb/DOM/Range.h
View file

@ -84,6 +84,8 @@ public:
JS::NonnullGCPtr<Geometry::DOMRect> get_bounding_client_rect() const;
bool contains_node(Node const&) const;
private:
explicit Range(Document&);
Range(Node& start_container, u32 start_offset, Node& end_container, u32 end_offset);
@ -105,7 +107,6 @@ private:
WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> clone_the_contents();
WebIDL::ExceptionOr<void> insert(JS::NonnullGCPtr<Node>);
bool contains_node(Node const&) const;
bool partially_contains_node(Node const&) const;
};

63
Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
View file

@ -8,6 +8,7 @@
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Event.h>
#include <LibWeb/DOM/HTMLCollection.h>
#include <LibWeb/DOM/Range.h>
#include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/BrowsingContextContainer.h>
@ -468,53 +469,43 @@ void BrowsingContext::set_cursor_position(DOM::Position position)
reset_cursor_blink_cycle();
}
DeprecatedString BrowsingContext::selected_text() const
static DeprecatedString visible_text_in_range(DOM::Range const& range)
{
// NOTE: This is an adaption of Range stringification, but we skip over DOM nodes that don't have a corresponding layout node.
StringBuilder builder;
if (!active_document())
return {};
auto* layout_root = active_document()->layout_node();
if (!layout_root)
return {};
if (!layout_root->selection().is_valid())
return {};
auto selection = layout_root->selection().normalized();
if (selection.start().layout_node.ptr() == selection.end().layout_node) {
if (!is<Layout::TextNode>(*selection.start().layout_node))
return "";
return verify_cast<Layout::TextNode>(*selection.start().layout_node).text_for_rendering().substring(selection.start().index_in_node, selection.end().index_in_node - selection.start().index_in_node);
if (range.start_container() == range.end_container() && is<DOM::Text>(*range.start_container())) {
if (!range.start_container()->layout_node())
return ""sv;
return static_cast<DOM::Text const&>(*range.start_container()).data().substring(range.start_offset(), range.end_offset() - range.start_offset());
}
// Start node
auto layout_node = selection.start().layout_node;
if (is<Layout::TextNode>(*layout_node)) {
auto& text = verify_cast<Layout::TextNode>(*layout_node).text_for_rendering();
builder.append(text.substring(selection.start().index_in_node, text.length() - selection.start().index_in_node));
if (is<DOM::Text>(*range.start_container()) && range.start_container()->layout_node())
builder.append(static_cast<DOM::Text const&>(*range.start_container()).data().substring_view(range.start_offset()));
for (DOM::Node const* node = range.start_container(); node != range.end_container()->next_sibling(); node = node->next_in_pre_order()) {
if (is<DOM::Text>(*node) && range.contains_node(*node) && node->layout_node())
builder.append(static_cast<DOM::Text const&>(*node).data());
}
// Middle nodes
layout_node = layout_node->next_in_pre_order();
while (layout_node && layout_node.ptr() != selection.end().layout_node) {
if (is<Layout::TextNode>(*layout_node))
builder.append(verify_cast<Layout::TextNode>(*layout_node).text_for_rendering());
else if (is<Layout::BreakNode>(*layout_node) || is<Layout::BlockContainer>(*layout_node))
builder.append('\n');
layout_node = layout_node->next_in_pre_order();
}
// End node
VERIFY(layout_node.ptr() == selection.end().layout_node);
if (is<Layout::TextNode>(*layout_node)) {
auto& text = verify_cast<Layout::TextNode>(*layout_node).text_for_rendering();
builder.append(text.substring(0, selection.end().index_in_node));
}
if (is<DOM::Text>(*range.end_container()) && range.end_container()->layout_node())
builder.append(static_cast<DOM::Text const&>(*range.end_container()).data().substring_view(0, range.end_offset()));
return builder.to_deprecated_string();
}
DeprecatedString BrowsingContext::selected_text() const
{
auto* document = active_document();
if (!document)
return ""sv;
auto selection = const_cast<DOM::Document&>(*document).get_selection();
auto range = selection->range();
if (!range)
return ""sv;
return visible_text_in_range(*range);
}
void BrowsingContext::select_all()
{
if (!active_document())