WIP: Modified AXPosition to work with objects with both embedded object characters and text.

third_party/WebKit/Source/modules/accessibility/AXRange.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef AXRange_h
+#define AXRange_h
+
+#include "core/editing/TextAffinity.h"
+#include "core/editing/VisibleSelection.h"
+
+namespace blink {
+
+class AXObject;
+
+class AXRange {
+  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
+
+ public:
+  AXRange()
+      : anchor_object_(nullptr),
+        anchor_offset_(-1),
+        focus_object_(nullptr),
+        focus_offset_(-1),
+        affinity_(TextAffinity::kDownstream) {}
+
+  AXRange(AXObject* anchor_object,
+          int anchor_offset,
+          AXObject* focus_object,
+          int focus_offset,
+          TextAffinity affinity = TextAffinity::kDownstream)
+      : anchor_object_(anchor_object),
+        anchor_offset_(anchor_offset),
+        focus_object_(focus_object),
+        focus_offset_(focus_offset),
+        affinity_(affinity) {}
+
+  explicit AXRange(VisibleSelectionInFlatTree& selection);
+
+  ~AXRange() = default;
+
+  AXObject* AnchorObject() { return anchor_object_; }
+  void SetAnchorObject(AXObject* anchor_object) {
+    anchor_object_ = anchor_object;
+  }
+  int AnchorOffset() { return anchor_offset_; }
+  void SetAnchorOffset(int anchor_offset) { anchor_offset_ = anchor_offset; }
+
+  AXObject* FocusObject() { return focus_object_; }
+  void SetFocusObject(AXObject* focus_object) { focus_object_ = focus_object; }
+  int FocusOffset() { return focus_offset_; }
+  void SetFocusOffset(int focus_offset) { focus_offset_ = focus_offset; }
+
+  TextAffinity Affinity() { return affinity_; }
+  void SetAffinity(TextAffinity affinity) { affinity_ = affinity; }
+
+  bool IsValid() const;
+
+  // Determines if the range only refers to text offsets under the current
+  // object.
+  bool IsSimple() const {
+    return IsValid() && (anchor_object_ == focus_object_);
+  }
+
+  // In flat tree because AXObjects could be in the shadow DOM.
+  VisibleSelectionInFlatTree AsVisibleSelectionInFlatTree() const;
+
+  // Tries to set the selection to this range.
+  void Select();
+
+ private:
+  // The deepest descendant in which the range starts.
+  Persistent<AXObject> anchor_object_;
+  // The number of characters or child objects in the anchor object before the
+  // range starts.
+  int anchor_offset_;
+
+  // The deepest descendant in which the range ends.
+  Persistent<AXObject> focus_object_;
+  // The number of characters or child objects in the focus object before the
+  // range ends.
+  int focus_offset_;
+
+  // When the same character offset could correspond to two possible caret
+  // positions, upstream means it's on the previous line rather than the next
+  // line.
+  TextAffinity affinity_;
+};
+
+}  // namespace blink
+
+#endif  // AXRange_h