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LibWeb: Support displaying HTMLInputElement placeholder values

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This adds support for parsing the ::placeholder pseudo-element and
injecting an anonymous layout node with that element when the input
element's data is empty.
This commit is contained in:
Timothy Flynn 2022-11-30 22:15:12 -05:00 • committed by Tim Flynn
parent fddbc2e378
commit 4a30446999
5 changed files with 91 additions and 0 deletions
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23
Userland/Libraries/LibWeb/Layout/TreeBuilder.cpp
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@ -13,6 +13,7 @@
#include <LibWeb/DOM/ParentNode.h>
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/Dump.h>
#include <LibWeb/HTML/HTMLInputElement.h>
#include <LibWeb/HTML/HTMLProgressElement.h>
#include <LibWeb/Layout/InitialContainingBlock.h>
#include <LibWeb/Layout/ListItemBox.h>
@ -292,6 +293,28 @@ void TreeBuilder::create_layout_tree(DOM::Node& dom_node, TreeBuilder::Context&
progress.set_pseudo_element_node({}, CSS::Selector::PseudoElement::ProgressValue, progress_value);
}
}
if (is<HTML::HTMLInputElement>(dom_node)) {
auto& input_element = static_cast<HTML::HTMLInputElement&>(dom_node);
if (auto placeholder_value = input_element.placeholder_value(); placeholder_value.has_value()) {
auto placeholder_style = style_computer.compute_style(input_element, CSS::Selector::PseudoElement::Placeholder);
auto placeholder = DOM::Element::create_layout_node_for_display_type(document, placeholder_style->display(), placeholder_style, nullptr);
auto* text = document.heap().allocate<DOM::Text>(document.realm(), document, *placeholder_value);
auto* text_node = document.heap().allocate_without_realm<Layout::TextNode>(document, *text);
text_node->set_generated(true);
push_parent(verify_cast<NodeWithStyle>(*layout_node));
push_parent(verify_cast<NodeWithStyle>(*placeholder));
insert_node_into_inline_or_block_ancestor(*text_node, text_node->display(), AppendOrPrepend::Append);
pop_parent();
insert_node_into_inline_or_block_ancestor(*placeholder, placeholder->display(), AppendOrPrepend::Append);
pop_parent();
input_element.set_pseudo_element_node({}, CSS::Selector::PseudoElement::Placeholder, placeholder);
}
}
}
JS::GCPtr<Layout::Node> TreeBuilder::build(DOM::Node& dom_node)