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LibWeb: Implement Selection.setBaseAndExtent

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This commit is contained in:
Luke Wilde 2022-12-09 19:00:18 +00:00 • committed by Linus Groh
parent b47aceb480
commit 919aa45017
2 changed files with 42 additions and 7 deletions
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47
Userland/Libraries/LibWeb/Selection/Selection.cpp
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@ -237,13 +237,48 @@ WebIDL::ExceptionOr<void> Selection::extend(JS::NonnullGCPtr<DOM::Node> node, un
}
// https://w3c.github.io/selection-api/#dom-selection-setbaseandextent
void Selection::set_base_and_extent(JS::NonnullGCPtr<DOM::Node> anchor_node, unsigned anchor_offset, JS::NonnullGCPtr<DOM::Node> focus_node, unsigned focus_offset)
WebIDL::ExceptionOr<void> Selection::set_base_and_extent(JS::NonnullGCPtr<DOM::Node> anchor_node, unsigned anchor_offset, JS::NonnullGCPtr<DOM::Node> focus_node, unsigned focus_offset)
{
(void)anchor_node;
(void)anchor_offset;
(void)focus_node;
(void)focus_offset;
TODO();
// 1. If anchorOffset is longer than anchorNode's length or if focusOffset is longer than focusNode's length, throw an IndexSizeError exception and abort these steps.
if (anchor_offset > anchor_node->length())
return WebIDL::IndexSizeError::create(realm(), "Anchor offset points outside of the anchor node");
if (focus_offset > focus_node->length())
return WebIDL::IndexSizeError::create(realm(), "Focus offset points outside of the focus node");
// 2. If the roots of anchorNode or focusNode are not the document associated with this, abort these steps.
if (&anchor_node->root() != m_document.ptr())
return {};
if (&focus_node->root() != m_document.ptr())
return {};
// 3. Let anchor be the boundary point (anchorNode, anchorOffset) and let focus be the boundary point (focusNode, focusOffset).
// 4. Let newRange be a new range.
auto new_range = DOM::Range::create(*m_document);
// 5. If anchor is before focus, set the start the newRange's start to anchor and its end to focus. Otherwise, set the start them to focus and anchor respectively.
auto position_of_anchor_relative_to_focus = DOM::position_of_boundary_point_relative_to_other_boundary_point(anchor_node, anchor_offset, focus_node, focus_offset);
if (position_of_anchor_relative_to_focus == DOM::RelativeBoundaryPointPosition::Before) {
TRY(new_range->set_start(anchor_node, anchor_offset));
TRY(new_range->set_end(focus_node, focus_offset));
} else {
TRY(new_range->set_start(focus_node, focus_offset));
TRY(new_range->set_end(anchor_node, anchor_offset));
}
// 6. Set this's range to newRange.
m_range = new_range;
// 7. If focus is before anchor, set this's direction to backwards. Otherwise, set it to forwards
// NOTE: "Otherwise" can be seen as "focus is equal to or after anchor".
if (position_of_anchor_relative_to_focus == DOM::RelativeBoundaryPointPosition::After)
m_direction = Direction::Backwards;
else
m_direction = Direction::Forwards;
return {};
}
// https://w3c.github.io/selection-api/#dom-selection-selectallchildren