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LibWeb: Move hit testing to the painting tree
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ba606d9057
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18 changed files with 196 additions and 172 deletions
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@ -26,30 +26,10 @@ enum class LayoutMode {
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OnlyRequiredLineBreaks,
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};
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struct HitTestResult {
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RefPtr<Painting::Paintable> paintable;
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int index_in_node { 0 };
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enum InternalPosition {
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None,
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Before,
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Inside,
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After,
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};
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InternalPosition internal_position { None };
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};
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enum class HitTestType {
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Exact, // Exact matches only
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TextCursor, // Clicking past the right/bottom edge of text will still hit the text
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};
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class Node : public TreeNode<Node> {
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public:
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virtual ~Node();
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virtual HitTestResult hit_test(const Gfx::IntPoint&, HitTestType) const;
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bool is_anonymous() const { return !m_dom_node; }
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const DOM::Node* dom_node() const { return m_dom_node; }
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DOM::Node* dom_node() { return m_dom_node; }
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@ -144,72 +124,6 @@ public:
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SelectionState selection_state() const { return m_selection_state; }
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void set_selection_state(SelectionState state) { m_selection_state = state; }
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template<typename Callback>
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void for_each_child_in_paint_order(Callback callback) const
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{
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// Element traversal using the order defined in https://www.w3.org/TR/CSS2/zindex.html#painting-order.
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// Note: Some steps are skipped because they are not relevant to node traversal.
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// 3. Stacking contexts formed by positioned descendants with negative z-indices (excluding 0) in z-index order
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// (most negative first) then tree order.
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// FIXME: This does not retrieve elements in the z-index order.
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for_each_child([&](auto& child) {
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if (!child.is_positioned() || !is<Box>(child))
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return;
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auto& box_child = verify_cast<Box>(child);
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auto* stacking_context = box_child.paint_box()->stacking_context();
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if (stacking_context && box_child.computed_values().z_index().has_value() && box_child.computed_values().z_index().value() < 0)
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callback(child);
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});
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// 4. For all its in-flow, non-positioned, block-level descendants in tree order: If the element is a block, list-item,
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// or other block equivalent:
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for_each_child([&](auto& child) {
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if (is<Box>(child) && verify_cast<Box>(child).paint_box()->stacking_context())
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return;
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if (!child.is_positioned())
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callback(child);
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});
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// 5. All non-positioned floating descendants, in tree order. For each one of these, treat the element as if it created
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// a new stacking context, but any positioned descendants and descendants which actually create a new stacking context
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// should be considered part of the parent stacking context, not this new one.
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for_each_child([&](auto& child) {
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if (is<Box>(child) && verify_cast<Box>(child).paint_box()->stacking_context())
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return;
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if (child.is_positioned())
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callback(child);
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});
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// 8. All positioned descendants with 'z-index: auto' or 'z-index: 0', in tree order. For those with 'z-index: auto', treat
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// the element as if it created a new stacking context, but any positioned descendants and descendants which actually
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// create a new stacking context should be considered part of the parent stacking context, not this new one. For those
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// with 'z-index: 0', treat the stacking context generated atomically.
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for_each_child([&](auto& child) {
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if (!child.is_positioned() || !is<Box>(child))
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return;
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auto& box_child = verify_cast<Box>(child);
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auto* stacking_context = box_child.paint_box()->stacking_context();
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if (stacking_context && box_child.computed_values().z_index().has_value() && box_child.computed_values().z_index().value() == 0)
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callback(child);
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});
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// 9. Stacking contexts formed by positioned descendants with z-indices greater than or equal to 1 in z-index order
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// (smallest first) then tree order.
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// FIXME: This does not retrieve elements in the z-index order.
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for_each_child([&](auto& child) {
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if (!child.is_positioned() || !is<Box>(child))
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return;
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auto& box_child = verify_cast<Box>(child);
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auto* stacking_context = box_child.paint_box()->stacking_context();
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if (stacking_context && box_child.computed_values().z_index().has_value() && box_child.computed_values().z_index().value() > 0)
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callback(child);
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});
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}
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protected:
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Node(DOM::Document&, DOM::Node*);
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