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LibWeb: Support CSS content property images (and lists, too!)

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This patch expands our generated content support beyond single strings
to lists of strings and/or images.

Pseudo-elements like ::before and ::after can now use content:url(...)
to insert anonymous image boxes into the layout tree.

This is heavily used in Google Docs for UI elements.
This commit is contained in:
Andreas Kling 2025-07-27 15:55:16 +02:00 • committed by Andreas Kling
commit 81d4079c12
Notes: github-actions[bot] 2025-07-28 20:48:00 +00:00
16 changed files with 494 additions and 99 deletions
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30
Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp
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@ -66,6 +66,9 @@ void ImageStyleValue::load_any_resources(DOM::Document& document)
if (!weak_this || !m_document)
return;
for (auto* client : m_clients)
client->image_style_value_did_update(*this);
auto image_data = m_resource_request->image_data();
if (image_data->is_animated() && image_data->frame_count() > 1) {
m_timer = Platform::Timer::create(m_document->heap());
@ -212,4 +215,31 @@ ValueComparingNonnullRefPtr<CSSStyleValue const> ImageStyleValue::absolutized(CS
return *this;
}
void ImageStyleValue::register_client(Client& client)
{
auto result = m_clients.set(&client);
VERIFY(result == AK::HashSetResult::InsertedNewEntry);
}
void ImageStyleValue::unregister_client(Client& client)
{
auto did_remove = m_clients.remove(&client);
VERIFY(did_remove);
}
ImageStyleValue::Client::Client(ImageStyleValue& image_style_value)
: m_image_style_value(image_style_value)
{
m_image_style_value.register_client(*this);
}
ImageStyleValue::Client::~Client()
{
}
void ImageStyleValue::Client::image_style_value_finalize()
{
m_image_style_value.unregister_client(*this);
}
}