1 files changed, 172 insertions, 0 deletions
diff --git a/dom/svg/DOMSVGNumber.h b/dom/svg/DOMSVGNumber.h
new file mode 100644
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+++ b/dom/svg/DOMSVGNumber.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_SVG_DOMSVGNUMBER_H_
+#define DOM_SVG_DOMSVGNUMBER_H_
+
+#include "DOMSVGNumberList.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/RefPtr.h"
+#include "nsWrapperCache.h"
+
+#define MOZ_SVG_LIST_INDEX_BIT_COUNT 27  // supports > 134 million list items
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+class SVGElement;
+class SVGSVGElement;
+
+/**
+ * Class DOMSVGNumber
+ *
+ * This class creates the DOM objects that wrap internal SVGNumber objects that
+ * are in an SVGNumberList. It is also used to create the objects returned by
+ * SVGSVGElement.createSVGNumber().
+ *
+ * For the DOM wrapper classes for non-list SVGNumber, see SVGAnimatedNumber.h.
+ *
+ * See the architecture comment in DOMSVGAnimatedNumberList.h.
+ *
+ * See the comment in DOMSVGLength.h (yes, LENGTH), which applies here too.
+ */
+class DOMSVGNumber final : public nsWrapperCache {
+  template <class T>
+  friend class AutoChangeNumberListNotifier;
+
+  ~DOMSVGNumber() {
+    // Our mList's weak ref to us must be nulled out when we die. If GC has
+    // unlinked us using the cycle collector code, then that has already
+    // happened, and mList is null.
+    if (mList) {
+      mList->mItems[mListIndex] = nullptr;
+    }
+  }
+
+ public:
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(DOMSVGNumber)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(DOMSVGNumber)
+
+  /**
+   * Generic ctor for DOMSVGNumber objects that are created for an attribute.
+   */
+  DOMSVGNumber(DOMSVGNumberList* aList, uint8_t aAttrEnum, uint32_t aListIndex,
+               bool aIsAnimValItem);
+
+  /**
+   * Ctor for creating the objects returned by SVGSVGElement.createSVGNumber(),
+   * which do not initially belong to an attribute.
+   */
+  explicit DOMSVGNumber(SVGSVGElement* aParent);
+
+ private:
+  explicit DOMSVGNumber(nsISupports* aParent);
+
+ public:
+  /**
+   * Create an unowned copy. The caller is responsible for the first AddRef().
+   */
+  DOMSVGNumber* Clone() {
+    DOMSVGNumber* clone = new DOMSVGNumber(mParent);
+    clone->mValue = ToSVGNumber();
+    return clone;
+  }
+
+  bool IsInList() const { return !!mList; }
+
+  /**
+   * Returns true if our attribute is animating.
+   */
+  bool IsAnimating() const { return mList && mList->IsAnimating(); }
+
+  /**
+   * In future, if this class is used for non-list numbers, this will be
+   * different to IsInList().
+   */
+  bool HasOwner() const { return !!mList; }
+
+  /**
+   * This method is called to notify this DOM object that it is being inserted
+   * into a list, and give it the information it needs as a result.
+   *
+   * This object MUST NOT already belong to a list when this method is called.
+   * That's not to say that script can't move these DOM objects between
+   * lists - it can - it's just that the logic to handle that (and send out
+   * the necessary notifications) is located elsewhere (in DOMSVGNumberList).)
+   */
+  void InsertingIntoList(DOMSVGNumberList* aList, uint8_t aAttrEnum,
+                         uint32_t aListIndex, bool aIsAnimValItem);
+
+  static uint32_t MaxListIndex() {
+    return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;
+  }
+
+  /// This method is called to notify this object that its list index changed.
+  void UpdateListIndex(uint32_t aListIndex) { mListIndex = aListIndex; }
+
+  /**
+   * This method is called to notify this DOM object that it is about to be
+   * removed from its current DOM list so that it can first make a copy of its
+   * internal counterpart's value. (If it didn't do this, then it would
+   * "lose" its value on being removed.)
+   */
+  void RemovingFromList();
+
+  float ToSVGNumber();
+
+  nsISupports* GetParentObject() { return mParent; }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  float Value();
+
+  void SetValue(float aValue, ErrorResult& aRv);
+
+ private:
+  dom::SVGElement* Element() { return mList->Element(); }
+
+  uint8_t AttrEnum() const { return mAttrEnum; }
+
+  /**
+   * Get a reference to the internal SVGNumber list item that this DOM wrapper
+   * object currently wraps.
+   *
+   * To simplify the code we just have this one method for obtaining both
+   * baseVal and animVal internal items. This means that animVal items don't
+   * get const protection, but then our setter methods guard against changing
+   * animVal items.
+   */
+  float& InternalItem();
+
+#ifdef DEBUG
+  bool IndexIsValid();
+#endif
+
+  RefPtr<DOMSVGNumberList> mList;
+  nsCOMPtr<nsISupports> mParent;
+
+  // Bounds for the following are checked in the ctor, so be sure to update
+  // that if you change the capacity of any of the following.
+
+  uint32_t mListIndex : MOZ_SVG_LIST_INDEX_BIT_COUNT;
+  uint32_t mAttrEnum : 4;  // supports up to 16 attributes
+  uint32_t mIsAnimValItem : 1;
+
+  // The following member is only used when we're not in a list:
+  float mValue;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
+
+#endif  // DOM_SVG_DOMSVGNUMBER_H_