LibWeb: Refactor all LabelableNode subclasses + input event handling :^)

This commit is messy due to the Paintable and Layout classes being
tangled together.

The RadioButton, CheckBox and ButtonBox classes are now subclasses of
FormAssociatedLabelableNode. This subclass separates these layout nodes
from LabelableNode, which is also the superclass of non-form associated
labelable nodes (Progress).

ButtonPaintable, CheckBoxPaintable and RadioButtonPaintable no longer
call events on DOM nodes directly from their mouse event handlers;
instead, all the functionality is now directly in EventHandler, which
dispatches the related events. handle_mousedown and related methods
return a bool indicating whether the event handling should proceed.

Paintable classes can now return an alternative DOM::Node which should
be the target of the mouse event. Labels use this to indicate that the
labeled control should be the target of the mouse events.

HTMLInputElement put its activation behavior on run_activation_behavior,
which wasn't actually called anywhere and had to be manually called by
other places. We now use activation_behavior which is used by
EventDispatcher.

This commit also brings HTMLInputElement closer to spec by removing the
did_foo functions that did ad-hoc event dispatching and unifies the
behavior under run_input_activation_behavior.

1 files changed, 4 insertions, 78 deletions

diff --git a/Userland/Libraries/LibWeb/Painting/ButtonPaintable.cpp b/Userland/Libraries/LibWeb/Painting/ButtonPaintable.cpp
index dd406293bb..63c1f33c40 100644
--- a/Userland/Libraries/LibWeb/Painting/ButtonPaintable.cpp
+++ b/Userland/Libraries/LibWeb/Painting/ButtonPaintable.cpp
@@ -40,87 +40,13 @@ void ButtonPaintable::paint(PaintContext& context, PaintPhase phase) const
 
     PaintableBox::paint(context, phase);
 
-    if (phase == PaintPhase::Foreground) {
+    auto const& dom_node = layout_box().dom_node();
+    if (is<HTML::HTMLInputElement>(dom_node) && phase == PaintPhase::Foreground) {
         auto text_rect = enclosing_int_rect(absolute_rect());
-        if (m_being_pressed)
+        if (being_pressed())
             text_rect.translate_by(1, 1);
-        context.painter().draw_text(text_rect, layout_box().dom_node().value(), layout_box().font(), Gfx::TextAlignment::Center, computed_values().color());
+        context.painter().draw_text(text_rect, static_cast<HTML::HTMLInputElement const&>(dom_node).value(), layout_box().font(), Gfx::TextAlignment::Center, computed_values().color());
     }
 }
 
-void ButtonPaintable::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned)
-{
-    if (button != GUI::MouseButton::Primary || !layout_box().dom_node().enabled())
-        return;
-
-    m_being_pressed = true;
-    set_needs_display();
-
-    m_tracking_mouse = true;
-    browsing_context().event_handler().set_mouse_event_tracking_layout_node(&layout_box());
-}
-
-void ButtonPaintable::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
-{
-    if (!m_tracking_mouse || button != GUI::MouseButton::Primary || !layout_box().dom_node().enabled())
-        return;
-
-    // NOTE: Handling the click may run arbitrary JS, which could disappear this node.
-    NonnullRefPtr protected_this = *this;
-    NonnullRefPtr protected_browsing_context = browsing_context();
-
-    bool is_inside_node_or_label = enclosing_int_rect(absolute_rect()).contains(position);
-    if (!is_inside_node_or_label)
-        is_inside_node_or_label = Layout::Label::is_inside_associated_label(layout_box(), position);
-
-    if (is_inside_node_or_label)
-        const_cast<Layout::ButtonBox&>(layout_box()).dom_node().did_click_button({});
-
-    m_being_pressed = false;
-    m_tracking_mouse = false;
-
-    protected_browsing_context->event_handler().set_mouse_event_tracking_layout_node(nullptr);
-}
-
-void ButtonPaintable::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
-{
-    if (!m_tracking_mouse || !layout_box().dom_node().enabled())
-        return;
-
-    bool is_inside_node_or_label = enclosing_int_rect(absolute_rect()).contains(position);
-    if (!is_inside_node_or_label)
-        is_inside_node_or_label = Layout::Label::is_inside_associated_label(layout_box(), position);
-
-    if (m_being_pressed == is_inside_node_or_label)
-        return;
-
-    m_being_pressed = is_inside_node_or_label;
-    set_needs_display();
-}
-
-void ButtonPaintable::handle_associated_label_mousedown(Badge<Layout::Label>)
-{
-    m_being_pressed = true;
-    set_needs_display();
-}
-
-void ButtonPaintable::handle_associated_label_mouseup(Badge<Layout::Label>)
-{
-    // NOTE: Handling the click may run arbitrary JS, which could disappear this node.
-    NonnullRefPtr protected_this = *this;
-    NonnullRefPtr protected_browsing_context = browsing_context();
-
-    layout_box().dom_node().did_click_button({});
-    m_being_pressed = false;
-}
-
-void ButtonPaintable::handle_associated_label_mousemove(Badge<Layout::Label>, bool is_inside_node_or_label)
-{
-    if (m_being_pressed == is_inside_node_or_label)
-        return;
-
-    m_being_pressed = is_inside_node_or_label;
-    set_needs_display();
-}
-
 }