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LibWeb: Invalidate layout-transformed text on DOM text node change

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This fixes an issue where programmatically changing the value of an
input element wasn't reflected visually.
This commit is contained in:
Andreas Kling 2023-08-16 11:03:00 +02:00
parent e2740bd19d
commit 1c47695bae
Notes: sideshowbarker 2024-07-16 21:39:23 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/1c47695bae
Pull-request: https://github.com/SerenityOS/serenity/pull/20591
5 changed files with 44 additions and 0 deletions
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22
Tests/LibWeb/Layout/expected/input-text-node-invalidation-on-value-change.txt Normal file
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@ -0,0 +1,22 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x21.46875 children: inline
line 0 width: 120, height: 21.46875, bottom: 21.46875, baseline: 21.46875
frag 0 from BlockContainer start: 0, length: 0, rect: [9,9 118x19.46875]
BlockContainer <input#foo> at (9,9) content-size 118x19.46875 inline-block [BFC] children: not-inline
Box <div> at (11,10) content-size 114x17.46875 flex-container(row) [FFC] children: not-inline
BlockContainer <div> at (11,10) content-size 49.734375x17.46875 flex-item [BFC] children: inline
line 0 width: 49.734375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 4, rect: [11,10 49.734375x17.46875]
"PASS"
TextNode <#text>
TextNode <#text>
TextNode <#text>
PaintableWithLines (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x21.46875]
PaintableWithLines (BlockContainer<INPUT>#foo) [8,8 120x21.46875]
PaintableBox (Box<DIV>) [9,9 118x19.46875]
PaintableWithLines (BlockContainer<DIV>) [11,10 49.734375x17.46875]
TextPaintable (TextNode<#text>)

9
Tests/LibWeb/Layout/input/input-text-node-invalidation-on-value-change.html Normal file
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@ -0,0 +1,9 @@
<input id="foo">
<script>
let foo = document.getElementById("foo");
foo.value = "FAIL";
document.body.offsetWidth; // Force a layout
document.addEventListener("DOMContentLoaded", function() {
foo.value = "PASS";
});
</script>

7
Userland/Libraries/LibWeb/DOM/CharacterData.cpp
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@ -10,6 +10,7 @@
#include <LibWeb/DOM/MutationType.h>
#include <LibWeb/DOM/Range.h>
#include <LibWeb/DOM/StaticNodeList.h>
#include <LibWeb/Layout/TextNode.h>
namespace Web::DOM {
@ -108,6 +109,12 @@ WebIDL::ExceptionOr<void> CharacterData::replace_data(size_t offset, size_t coun
if (parent())
parent()->children_changed();
// NOTE: Since the text node's data has changed, we need to invalidate the text for rendering.
// This ensures that the new text is reflected in layout, even if we don't end up
// doing a full layout tree rebuild.
if (auto* layout_node = this->layout_node(); layout_node && layout_node->is_text_node())
static_cast<Layout::TextNode&>(*layout_node).invalidate_text_for_rendering();
set_needs_style_update(true);
document().set_needs_layout();
return {};

5
Userland/Libraries/LibWeb/Layout/TextNode.cpp
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@ -41,6 +41,11 @@ static ErrorOr<DeprecatedString> apply_text_transform(DeprecatedString const& st
return string;
}
void TextNode::invalidate_text_for_rendering()
{
m_text_for_rendering = {};
}
DeprecatedString const& TextNode::text_for_rendering() const
{
if (m_text_for_rendering.is_null())

1
Userland/Libraries/LibWeb/Layout/TextNode.h
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@ -47,6 +47,7 @@ public:
Utf8View::Iterator m_iterator;
};
void invalidate_text_for_rendering();
void compute_text_for_rendering();
virtual JS::GCPtr<Painting::Paintable> create_paintable() const override;