flutter-tizen · JSUYA · Sep 23, 2025 · Sep 9, 2025
diff --git a/DEPS b/DEPS
@@ -7,7 +7,7 @@ deps = {
   'src/third_party/libcxx': 'https://llvm.googlesource.com/llvm-project/libcxx@bd557f6f764d1e40b62528a13b124ce740624f8f',
   'src/third_party/libcxxabi': 'https://llvm.googlesource.com/llvm-project/libcxxabi@a4dda1589d37a7e4b4f7a81ebad01b1083f2e726',
   'src/third_party/googletest': 'https://github.com/google/googletest@7f036c5563af7d0329f20e8bb42effb04629f0c0',
-  'src/third_party/dart': 'https://dart.googlesource.com/sdk.git@b04011c77cd93e6ab9144af37976733b558d716c',
+  'src/third_party/dart': 'https://dart.googlesource.com/sdk.git@a29e08c72e2ce21813c1edf50cbcdfcac7a7acdd',
   'src/third_party/clang': {
     'packages': [
       {

diff --git a/flutter/shell/platform/common/BUILD.gn b/flutter/shell/platform/common/BUILD.gn
@@ -32,7 +32,7 @@ source_set("common_cpp_library_headers") {
 
 copy("publish_headers") {
   sources = _public_headers
-  outputs = [ "$root_out_dir/public/{{source_file_part}}" ]
+  outputs = [ "$root_out_dir/{{source_file_part}}" ]
 }
 
 source_set("common_cpp_input") {
@@ -54,6 +54,13 @@ source_set("common_cpp_input") {
   deps = [ "//flutter/fml:fml" ]
 }
 
+source_set("common_cpp_isolate_scope") {
+  public = [ "isolate_scope.h" ]
+  sources = [ "isolate_scope.cc" ]
+
+  deps = [ "//flutter/fml:fml" ]
+}
+
 source_set("common_cpp_enums") {
   public = [
     "app_lifecycle_state.h",
@@ -116,6 +123,7 @@ source_set("common_cpp") {
   deps = [
     ":common_cpp_library_headers",
     "//flutter/shell/platform/common/client_wrapper:client_wrapper",
+    "//flutter/shell/platform/embedder:embedder_headers",
   ]
 
   public_deps = [
@@ -132,6 +140,7 @@ source_set("common_cpp_core") {
   public = [
     "geometry.h",
     "path_utils.h",
+    "windowing.h",
   ]
 
   sources = [ "path_utils.cc" ]

diff --git a/flutter/shell/platform/common/accessibility_bridge.cc b/flutter/shell/platform/common/accessibility_bridge.cc
@@ -311,43 +311,43 @@ void AccessibilityBridge::ConvertFlutterUpdate(const SemanticsNode& node,
 
 void AccessibilityBridge::SetRoleFromFlutterUpdate(ui::AXNodeData& node_data,
                                                    const SemanticsNode& node) {
-  FlutterSemanticsFlag flags = node.flags;
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsButton) {
+  const FlutterSemanticsFlags* flags = node.flags;
+  FML_DCHECK(flags) << "SemanticsNode::flags must not be null";
+  if (flags->is_button) {
     node_data.role = ax::mojom::Role::kButton;
     return;
   }
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
-      !(flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly)) {
+  if (flags->is_text_field && !flags->is_read_only) {
     node_data.role = ax::mojom::Role::kTextField;
     return;
   }
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsHeader) {
+  if (flags->is_header) {
     node_data.role = ax::mojom::Role::kHeader;
     return;
   }
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsImage) {
+  if (flags->is_image) {
     node_data.role = ax::mojom::Role::kImage;
     return;
   }
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsLink) {
+  if (flags->is_link) {
     node_data.role = ax::mojom::Role::kLink;
     return;
   }
 
-  if (flags & kFlutterSemanticsFlagIsInMutuallyExclusiveGroup &&
-      flags & kFlutterSemanticsFlagHasCheckedState) {
+  if (flags->is_in_mutually_exclusive_group &&
+      flags->is_checked != FlutterCheckState::kFlutterCheckStateNone) {
     node_data.role = ax::mojom::Role::kRadioButton;
     return;
   }
-  if (flags & kFlutterSemanticsFlagHasCheckedState) {
+  if (flags->is_checked != FlutterCheckState::kFlutterCheckStateNone) {
     node_data.role = ax::mojom::Role::kCheckBox;
     return;
   }
-  if (flags & kFlutterSemanticsFlagHasToggledState) {
+  if (flags->is_toggled != FlutterTristate::kFlutterTristateNone) {
     node_data.role = ax::mojom::Role::kSwitch;
     return;
   }
-  if (flags & kFlutterSemanticsFlagIsSlider) {
+  if (flags->is_slider) {
     node_data.role = ax::mojom::Role::kSlider;
     return;
   }
@@ -362,17 +362,14 @@ void AccessibilityBridge::SetRoleFromFlutterUpdate(ui::AXNodeData& node_data,
 
 void AccessibilityBridge::SetStateFromFlutterUpdate(ui::AXNodeData& node_data,
                                                     const SemanticsNode& node) {
-  FlutterSemanticsFlag flags = node.flags;
+  const FlutterSemanticsFlags* flags = node.flags;
   FlutterSemanticsAction actions = node.actions;
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagHasExpandedState &&
-      flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsExpanded) {
+  if (flags->is_expanded == FlutterTristate::kFlutterTristateTrue) {
     node_data.AddState(ax::mojom::State::kExpanded);
-  } else if (flags &
-             FlutterSemanticsFlag::kFlutterSemanticsFlagHasExpandedState) {
+  } else if (flags->is_expanded == FlutterTristate::kFlutterTristateFalse) {
     node_data.AddState(ax::mojom::State::kCollapsed);
   }
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
-      (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly) == 0) {
+  if (flags->is_text_field && !flags->is_read_only) {
     node_data.AddState(ax::mojom::State::kEditable);
   }
   if (node_data.role == ax::mojom::Role::kStaticText &&
@@ -435,7 +432,7 @@ void AccessibilityBridge::SetBooleanAttributesFromFlutterUpdate(
     ui::AXNodeData& node_data,
     const SemanticsNode& node) {
   FlutterSemanticsAction actions = node.actions;
-  FlutterSemanticsFlag flags = node.flags;
+  const FlutterSemanticsFlags* flags = node.flags;
   node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kScrollable,
                              actions & kHasScrollingAction);
   node_data.AddBoolAttribute(
@@ -444,13 +441,10 @@ void AccessibilityBridge::SetBooleanAttributesFromFlutterUpdate(
   // TODO(chunhtai): figure out if there is a node that does not clip overflow.
   node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kClipsChildren,
                              !node.children_in_traversal_order.empty());
-  node_data.AddBoolAttribute(
-      ax::mojom::BoolAttribute::kSelected,
-      flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsSelected);
-  node_data.AddBoolAttribute(
-      ax::mojom::BoolAttribute::kEditableRoot,
-      flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
-          (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly) == 0);
+  node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kSelected,
+                             flags->is_selected);
+  node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kEditableRoot,
+                             flags->is_text_field && !flags->is_read_only);
   // Mark nodes as line breaking so that screen readers don't
   // merge all consecutive objects into one.
   // TODO(schectman): When should a node have this attribute set?
@@ -462,15 +456,13 @@ void AccessibilityBridge::SetBooleanAttributesFromFlutterUpdate(
 void AccessibilityBridge::SetIntAttributesFromFlutterUpdate(
     ui::AXNodeData& node_data,
     const SemanticsNode& node) {
-  FlutterSemanticsFlag flags = node.flags;
+  const FlutterSemanticsFlags* flags = node.flags;
   node_data.AddIntAttribute(ax::mojom::IntAttribute::kTextDirection,
                             node.text_direction);
 
   int sel_start = node.text_selection_base;
   int sel_end = node.text_selection_extent;
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
-      (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsReadOnly) == 0 &&
-      !node.value.empty()) {
+  if (flags->is_text_field && !flags->is_read_only && !node.value.empty()) {
     // By default the text field selection should be at the end.
     sel_start = sel_start == -1 ? node.value.length() : sel_start;
     sel_end = sel_end == -1 ? node.value.length() : sel_end;
@@ -483,16 +475,16 @@ void AccessibilityBridge::SetIntAttributesFromFlutterUpdate(
     node_data.AddIntAttribute(
         ax::mojom::IntAttribute::kCheckedState,
         static_cast<int32_t>(
-            flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsCheckStateMixed
+            (flags->is_checked == FlutterCheckState::kFlutterCheckStateMixed)
                 ? ax::mojom::CheckedState::kMixed
-            : flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsChecked
+            : (flags->is_checked == FlutterCheckState::kFlutterCheckStateTrue)
                 ? ax::mojom::CheckedState::kTrue
                 : ax::mojom::CheckedState::kFalse));
   } else if (node_data.role == ax::mojom::Role::kSwitch) {
     node_data.AddIntAttribute(
         ax::mojom::IntAttribute::kCheckedState,
         static_cast<int32_t>(
-            flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsToggled
+            (flags->is_toggled == FlutterTristate::kFlutterTristateTrue)
                 ? ax::mojom::CheckedState::kTrue
                 : ax::mojom::CheckedState::kFalse));
   }
@@ -548,13 +540,13 @@ void AccessibilityBridge::SetTooltipFromFlutterUpdate(
 
 void AccessibilityBridge::SetTreeData(const SemanticsNode& node,
                                       ui::AXTreeUpdate& tree_update) {
-  FlutterSemanticsFlag flags = node.flags;
+  const FlutterSemanticsFlags* flags = node.flags;
   // Set selection of the focused node if:
   // 1. this text field has a valid selection
   // 2. this text field doesn't have a valid selection but had selection stored
   //    in the tree.
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsTextField &&
-      flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsFocused) {
+  if (flags->is_text_field &&
+      flags->is_focused == FlutterTristate::kFlutterTristateTrue) {
     if (node.text_selection_base != -1) {
       tree_update.tree_data.sel_anchor_object_id = node.id;
       tree_update.tree_data.sel_anchor_offset = node.text_selection_base;
@@ -570,12 +562,11 @@ void AccessibilityBridge::SetTreeData(const SemanticsNode& node,
     }
   }
 
-  if (flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsFocused &&
+  if (flags->is_focused == FlutterTristate::kFlutterTristateTrue &&
       tree_update.tree_data.focus_id != node.id) {
     tree_update.tree_data.focus_id = node.id;
     tree_update.has_tree_data = true;
-  } else if ((flags & FlutterSemanticsFlag::kFlutterSemanticsFlagIsFocused) ==
-                 0 &&
+  } else if (flags->is_focused != FlutterTristate::kFlutterTristateTrue &&
              tree_update.tree_data.focus_id == node.id) {
     tree_update.tree_data.focus_id = ui::AXNode::kInvalidAXID;
     tree_update.has_tree_data = true;
@@ -587,7 +578,10 @@ AccessibilityBridge::FromFlutterSemanticsNode(
     const FlutterSemanticsNode2& flutter_node) {
   SemanticsNode result;
   result.id = flutter_node.id;
-  result.flags = flutter_node.flags;
+  FML_DCHECK(flutter_node.flags2)
+      << "FlutterSemanticsNode2::flags2 must not be null";
+
+  result.flags = flutter_node.flags2;
   result.actions = flutter_node.actions;
   result.text_selection_base = flutter_node.text_selection_base;
   result.text_selection_extent = flutter_node.text_selection_extent;
@@ -596,8 +590,6 @@ AccessibilityBridge::FromFlutterSemanticsNode(
   result.scroll_position = flutter_node.scroll_position;
   result.scroll_extent_max = flutter_node.scroll_extent_max;
   result.scroll_extent_min = flutter_node.scroll_extent_min;
-  result.elevation = flutter_node.elevation;
-  result.thickness = flutter_node.thickness;
   if (flutter_node.label) {
     result.label = std::string(flutter_node.label);
   }

diff --git a/flutter/shell/platform/common/accessibility_bridge.h b/flutter/shell/platform/common/accessibility_bridge.h
@@ -161,7 +161,7 @@ class AccessibilityBridge
   // See FlutterSemanticsNode in embedder.h
   typedef struct {
     int32_t id;
-    FlutterSemanticsFlag flags;
+    FlutterSemanticsFlags* flags;
     FlutterSemanticsAction actions;
     int32_t text_selection_base;
     int32_t text_selection_extent;
@@ -170,8 +170,6 @@ class AccessibilityBridge
     double scroll_position;
     double scroll_extent_max;
     double scroll_extent_min;
-    double elevation;
-    double thickness;
     std::string label;
     std::string hint;
     std::string value;

diff --git a/flutter/shell/platform/common/client_wrapper/include/flutter/encodable_value.h b/flutter/shell/platform/common/client_wrapper/include/flutter/encodable_value.h
@@ -216,12 +216,57 @@ class EncodableValue : public internal::EncodableValueVariant {
     return std::get<int64_t>(*this);
   }
 
-  // Explicitly provide operator<, delegating to std::variant's operator<.
-  // There are issues with with the way the standard library-provided
-  // < and <=> comparisons interact with classes derived from variant.
+// The C++ Standard Library implementations can get into issues with recursive
+// constraint satisfaction when (among other things) objects of this type (which
+// is an `std::variant` subclass) are put into containers like `std::vector`.
+//
+// A definition of `operator<` is provided to break that recursion. However, in
+// C++20 with the latest compilers (Clang compilers newer than 20 and the latest
+// GCC variants, see https://gcc.godbolt.org/z/KM6n6qane) requiring that that
+// the `std::three_way_comparable` constraint be satisfied requires the
+// provision of `operator<=>` to do the same thing.
+//
+// The code below makes this translation unit be safe to include from both C++17
+// and C++20 translation units while also using the newest compilers.
+//
+// The correctness of the compiler's gripes with this code and the subsequent
+// need for these workarounds is not fully understood or explored. If you run
+// into issues with this code again, the following breadcrumbs may prove
+// useful. If you cannot access some or all of these links, the compiler
+// explorer link above should serve a reduced test case to base an investigation
+// off of.
+//
+// * b/423885648#comment8
+// * b/423885648#comment19
+// * cl/542631351
+// * cl/542541552
+// * https://github.com/flutter/engine/pull/43091
+//
+#if __cplusplus >= 202002L
+  friend std::partial_ordering operator<=>(const EncodableValue& lhs,
+                                           const EncodableValue& rhs) {
+    auto& lv = static_cast<const super&>(lhs);
+    auto& rv = static_cast<const super&>(rhs);
+
+    if (lv < rv) {
+      return std::partial_ordering::less;
+    }
+
+    if (rv < lv) {
+      return std::partial_ordering::greater;
+    }
+
+    if (lv == rv) {
+      return std::partial_ordering::equivalent;
+    }
+
+    return std::partial_ordering::unordered;
+  }
+#else   //  __cplusplus >= 202002L
   friend bool operator<(const EncodableValue& lhs, const EncodableValue& rhs) {
     return static_cast<const super&>(lhs) < static_cast<const super&>(rhs);
   }
+#endif  //  __cplusplus >= 202002L
 };
 
 }  // namespace flutter

diff --git a/flutter/shell/platform/common/geometry.h b/flutter/shell/platform/common/geometry.h
@@ -6,6 +6,8 @@
 #define FLUTTER_SHELL_PLATFORM_COMMON_GEOMETRY_H_
 
 #include <cmath>
+#include <limits>
+#include <optional>
 
 namespace flutter {
 
@@ -45,6 +47,7 @@ class Size {
   bool operator==(const Size& other) const {
     return width_ == other.width_ && height_ == other.height_;
   }
+  bool operator!=(const Size& other) const { return !(*this == other); }
 
  private:
   double width_ = 0.0;
@@ -78,6 +81,27 @@ class Rect {
   Size size_;
 };
 
+// Encapsulates a min and max size that represents the constraints that some
+// arbitrary box is able to take up.
+class BoxConstraints {
+ public:
+  BoxConstraints() = default;
+  BoxConstraints(const std::optional<Size>& smallest,
+                 const std::optional<Size>& biggest)
+      : smallest_(smallest.value_or(Size(0, 0))),
+        biggest_(
+            biggest.value_or(Size(std::numeric_limits<double>::infinity(),
+                                  std::numeric_limits<double>::infinity()))) {}
+  BoxConstraints(const BoxConstraints& other) = default;
+  Size biggest() const { return biggest_; }
+  Size smallest() const { return smallest_; }
+
+ private:
+  Size smallest_ = Size(0, 0);
+  Size biggest_ = Size(std::numeric_limits<double>::infinity(),
+                       std::numeric_limits<double>::infinity());
+};
+
 }  // namespace flutter
 
 #endif  // FLUTTER_SHELL_PLATFORM_COMMON_GEOMETRY_H_