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LibWeb: Schedule input event processing on HTML event loop
Our existing coalescing mechanism for input events didn't prevent multiple mousemove/mousewheel events from being processed between paint cycles. Since handling these events can trigger style & layout updates solely for hit-testing purposes, we might end up doing work that won't be observable by a user and could be avoided by shceduling input events processing to happen right before painting the next frame.
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d3c481f71a
Notes:
github-actions[bot]
2025-02-15 20:10:12 +00:00
Author: https://github.com/kalenikaliaksandr
Commit: d3c481f71a
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3582
10 changed files with 90 additions and 70 deletions
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@ -60,7 +60,6 @@ ConnectionFromClient::ConnectionFromClient(GC::Heap& heap, IPC::Transport transp
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, m_heap(heap)
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, m_page_host(PageHost::create(*this))
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{
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m_input_event_queue_timer = Web::Platform::Timer::create_single_shot(m_heap, 0, GC::create_function(heap, [this] { process_next_input_event(); }));
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}
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ConnectionFromClient::~ConnectionFromClient() = default;
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@ -186,55 +185,6 @@ void ConnectionFromClient::ready_to_paint(u64 page_id)
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page->ready_to_paint();
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}
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void ConnectionFromClient::process_next_input_event()
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{
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if (m_input_event_queue.is_empty())
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return;
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auto event = m_input_event_queue.dequeue();
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auto page = this->page(event.page_id);
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if (!page.has_value())
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return;
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auto result = event.event.visit(
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[&](Web::KeyEvent const& event) {
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switch (event.type) {
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case Web::KeyEvent::Type::KeyDown:
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return page->page().handle_keydown(event.key, event.modifiers, event.code_point, event.repeat);
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case Web::KeyEvent::Type::KeyUp:
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return page->page().handle_keyup(event.key, event.modifiers, event.code_point, event.repeat);
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}
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VERIFY_NOT_REACHED();
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},
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[&](Web::MouseEvent const& event) {
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switch (event.type) {
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case Web::MouseEvent::Type::MouseDown:
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return page->page().handle_mousedown(event.position, event.screen_position, event.button, event.buttons, event.modifiers);
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case Web::MouseEvent::Type::MouseUp:
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return page->page().handle_mouseup(event.position, event.screen_position, event.button, event.buttons, event.modifiers);
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case Web::MouseEvent::Type::MouseMove:
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return page->page().handle_mousemove(event.position, event.screen_position, event.buttons, event.modifiers);
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case Web::MouseEvent::Type::MouseWheel:
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return page->page().handle_mousewheel(event.position, event.screen_position, event.button, event.buttons, event.modifiers, event.wheel_delta_x, event.wheel_delta_y);
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case Web::MouseEvent::Type::DoubleClick:
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return page->page().handle_doubleclick(event.position, event.screen_position, event.button, event.buttons, event.modifiers);
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}
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VERIFY_NOT_REACHED();
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},
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[&](Web::DragEvent& event) {
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return page->page().handle_drag_and_drop_event(event.type, event.position, event.screen_position, event.button, event.buttons, event.modifiers, move(event.files));
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});
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// We have to notify the client about coalesced events, so we do that by saying none of them were handled by the web page.
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for (size_t i = 0; i < event.coalesced_event_count; ++i)
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report_finished_handling_input_event(event.page_id, Web::EventResult::Dropped);
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report_finished_handling_input_event(event.page_id, result);
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if (!m_input_event_queue.is_empty())
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m_input_event_queue_timer->start();
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}
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void ConnectionFromClient::key_event(u64 page_id, Web::KeyEvent const& event)
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{
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enqueue_input_event({ page_id, move(const_cast<Web::KeyEvent&>(event)), 0 });
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@ -279,15 +229,9 @@ void ConnectionFromClient::drag_event(u64 page_id, Web::DragEvent const& event)
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enqueue_input_event({ page_id, move(const_cast<Web::DragEvent&>(event)), 0 });
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}
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void ConnectionFromClient::enqueue_input_event(QueuedInputEvent event)
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void ConnectionFromClient::enqueue_input_event(Web::QueuedInputEvent event)
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{
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m_input_event_queue.enqueue(move(event));
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m_input_event_queue_timer->start();
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}
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void ConnectionFromClient::report_finished_handling_input_event(u64 page_id, Web::EventResult event_result)
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{
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async_did_finish_handling_input_event(page_id, event_result);
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}
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void ConnectionFromClient::debug_request(u64 page_id, ByteString const& request, ByteString const& argument)
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