1 files changed, 52 insertions, 0 deletions
diff --git a/Userland/Libraries/LibWeb/Painting/StackingContext.h b/Userland/Libraries/LibWeb/Painting/StackingContext.h
new file mode 100644
index 0000000000..b0b212ed2d
--- /dev/null
+++ b/Userland/Libraries/LibWeb/Painting/StackingContext.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Vector.h>
+#include <LibWeb/Layout/Node.h>
+
+namespace Web::Layout {
+
+class StackingContext {
+public:
+    StackingContext(Box&, StackingContext* parent);
+
+    StackingContext* parent() { return m_parent; }
+    const StackingContext* parent() const { return m_parent; }
+
+    void paint(PaintContext&, PaintPhase);
+    HitTestResult hit_test(const Gfx::IntPoint&, HitTestType) const;
+
+    void dump(int indent = 0) const;
+
+private:
+    Box& m_box;
+    StackingContext* const m_parent { nullptr };
+    Vector<StackingContext*> m_children;
+};
+
+}