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LibWeb: Partially implement MouseEvent.movementX/movementY

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Currently doesn't handle the mouse leaving and entering the window per
the spec, and uses clientX/Y instead of screenX/Y. See FIXMEs.
This commit is contained in:
circl 2023-08-24 17:47:13 +02:00 • committed by Andrew Kaster
parent ebb7079795
commit e0e67a2b27
5 changed files with 51 additions and 8 deletions
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31
Userland/Libraries/LibWeb/Page/EventHandler.cpp
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@ -248,15 +248,15 @@ bool EventHandler::handle_mouseup(CSSPixelPoint position, unsigned button, unsig
auto offset = compute_mouse_event_offset(position, *layout_node);
auto client_offset = compute_mouse_event_client_offset(position);
auto page_offset = compute_mouse_event_page_offset(client_offset);
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mouseup, offset, client_offset, page_offset, buttons, button).release_value_but_fixme_should_propagate_errors());
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mouseup, offset, client_offset, page_offset, {}, buttons, button).release_value_but_fixme_should_propagate_errors());
handled_event = true;
bool run_activation_behavior = false;
if (node.ptr() == m_mousedown_target) {
if (button == GUI::MouseButton::Primary)
run_activation_behavior = node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::click, offset, client_offset, page_offset, button).release_value_but_fixme_should_propagate_errors());
run_activation_behavior = node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::click, offset, client_offset, page_offset, {}, button).release_value_but_fixme_should_propagate_errors());
else if (button == GUI::MouseButton::Secondary && !(modifiers & Mod_Shift)) // Allow the user to bypass custom context menus by holding shift, like Firefox.
run_activation_behavior = node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::contextmenu, offset, client_offset, page_offset, button).release_value_but_fixme_should_propagate_errors());
run_activation_behavior = node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::contextmenu, offset, client_offset, page_offset, {}, button).release_value_but_fixme_should_propagate_errors());
}
if (run_activation_behavior) {
@ -384,7 +384,7 @@ bool EventHandler::handle_mousedown(CSSPixelPoint position, unsigned button, uns
auto offset = compute_mouse_event_offset(position, *layout_node);
auto client_offset = compute_mouse_event_client_offset(position);
auto page_offset = compute_mouse_event_page_offset(client_offset);
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mousedown, offset, client_offset, page_offset, buttons, button).release_value_but_fixme_should_propagate_errors());
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mousedown, offset, client_offset, page_offset, {}, buttons, button).release_value_but_fixme_should_propagate_errors());
}
// NOTE: Dispatching an event may have disturbed the world.
@ -497,7 +497,9 @@ bool EventHandler::handle_mousemove(CSSPixelPoint position, unsigned buttons, un
auto offset = compute_mouse_event_offset(position, *layout_node);
auto client_offset = compute_mouse_event_client_offset(position);
auto page_offset = compute_mouse_event_page_offset(client_offset);
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mousemove, offset, client_offset, page_offset, buttons).release_value_but_fixme_should_propagate_errors());
auto movement = compute_mouse_event_movement(client_offset);
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mousemove, offset, client_offset, page_offset, movement, buttons).release_value_but_fixme_should_propagate_errors());
m_mousemove_previous_client_offset = client_offset;
// NOTE: Dispatching an event may have disturbed the world.
if (!paint_root() || paint_root() != node->document().paintable_box())
return true;
@ -582,7 +584,7 @@ bool EventHandler::handle_doubleclick(CSSPixelPoint position, unsigned button, u
auto offset = compute_mouse_event_offset(position, *layout_node);
auto client_offset = compute_mouse_event_client_offset(position);
auto page_offset = compute_mouse_event_page_offset(client_offset);
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::dblclick, offset, client_offset, page_offset, buttons, button).release_value_but_fixme_should_propagate_errors());
node->dispatch_event(UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::dblclick, offset, client_offset, page_offset, {}, buttons, button).release_value_but_fixme_should_propagate_errors());
// NOTE: Dispatching an event may have disturbed the world.
if (!paint_root() || paint_root() != node->document().paintable_box())
@ -834,6 +836,23 @@ CSSPixelPoint EventHandler::compute_mouse_event_page_offset(CSSPixelPoint event_
return event_client_offset.translated(scroll_offset);
}
CSSPixelPoint EventHandler::compute_mouse_event_movement(CSSPixelPoint event_client_offset) const
{
// https://w3c.github.io/pointerlock/#dom-mouseevent-movementx
// The attributes movementX movementY must provide the change in position of the pointer,
// as if the values of screenX, screenY, were stored between two subsequent mousemove events eNow and ePrevious and the difference taken movementX = eNow.screenX-ePrevious.screenX.
// FIXME: Using client_offset as screenX and screenY is currently equal to clientX and clientY
if (!m_mousemove_previous_client_offset.has_value())
// When unlocked, the system cursor can exit and re-enter the user agent window.
// If it does so and the user agent was not the target of operating system mouse move events
// then the most recent pointer position will be unknown to the user agent and movementX/movementY can not be computed and must be set to zero.
// FIXME: For this to actually work, m_mousemove_previous_client_offset needs to be cleared when the mouse leaves the window
return { 0, 0 };
return { event_client_offset.x() - m_mousemove_previous_client_offset.value().x(), event_client_offset.y() - m_mousemove_previous_client_offset.value().y() };
}
Optional<EventHandler::Target> EventHandler::target_for_mouse_position(CSSPixelPoint position)
{
if (m_mouse_event_tracking_layout_node) {