LibWeb: Let Paintable perform the painting

This patch adds a bunch of Paintable subclasses, each corresponding to
the Layout::Node subclasses that had a paint() override. All painting
logic is moved from layout nodes into their corresponding paintables.

Paintables are now created by asking a Layout::Box to produce one:

    static NonnullOwnPtr<Paintable> Layout::Box::create_paintable()

Note that inline nodes still have their painting logic. Since they
are not boxes, and all paintables have a corresponding box, we'll need
to come up with some other solution for them.

1 files changed, 40 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/Painting/CheckBoxPaintable.cpp b/Userland/Libraries/LibWeb/Painting/CheckBoxPaintable.cpp
new file mode 100644
index 0000000000..33e480f78e
--- /dev/null
+++ b/Userland/Libraries/LibWeb/Painting/CheckBoxPaintable.cpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGfx/StylePainter.h>
+#include <LibWeb/HTML/HTMLImageElement.h>
+#include <LibWeb/Layout/CheckBox.h>
+#include <LibWeb/Painting/CheckBoxPaintable.h>
+
+namespace Web::Painting {
+
+NonnullOwnPtr<CheckBoxPaintable> CheckBoxPaintable::create(Layout::CheckBox const& layout_box)
+{
+    return adopt_own(*new CheckBoxPaintable(layout_box));
+}
+
+CheckBoxPaintable::CheckBoxPaintable(Layout::CheckBox const& layout_box)
+    : Paintable(layout_box)
+{
+}
+
+Layout::CheckBox const& CheckBoxPaintable::layout_box() const
+{
+    return static_cast<Layout::CheckBox const&>(m_layout_box);
+}
+
+void CheckBoxPaintable::paint(PaintContext& context, PaintPhase phase) const
+{
+    if (!is_visible())
+        return;
+
+    Paintable::paint(context, phase);
+
+    if (phase == PaintPhase::Foreground)
+        Gfx::StylePainter::paint_check_box(context.painter(), enclosing_int_rect(absolute_rect()), context.palette(), layout_box().dom_node().enabled(), layout_box().dom_node().checked(), layout_box().being_pressed());
+}
+
+}