Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 209 insertions, 0 deletions

diff --git a/dom/svg/DOMSVGLengthList.h b/dom/svg/DOMSVGLengthList.h
new file mode 100644
index 0000000000..943bbf64d7
--- /dev/null
+++ b/dom/svg/DOMSVGLengthList.h
@@ -0,0 +1,209 @@
+/* -*- 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_DOMSVGLENGTHLIST_H_
+#define DOM_SVG_DOMSVGLENGTHLIST_H_
+
+#include "DOMSVGAnimatedLengthList.h"
+#include "mozAutoDocUpdate.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsDebug.h"
+#include "nsTArray.h"
+#include "SVGLengthList.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Unused.h"
+
+// {cbecb7a4-d6f3-47b5-b5a3-3e5bdbf5b2f9}
+#define MOZILLA_DOMSVGLENGTHLIST_IID                 \
+  {                                                  \
+    0xcbecb7a4, 0xd6f3, 0xd6f3, {                    \
+      0xb5, 0xa3, 0x3e, 0x5b, 0xdb, 0xf5, 0xb2, 0xf9 \
+    }                                                \
+  }
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+class DOMSVGLength;
+class SVGElement;
+
+//----------------------------------------------------------------------
+// Helper class: AutoChangeLengthListNotifier
+// Stack-based helper class to pair calls to WillChangeLengthList and
+// DidChangeLengthList. Used by DOMSVGLength and DOMSVGLengthList.
+template <class T>
+class MOZ_RAII AutoChangeLengthListNotifier : public mozAutoDocUpdate {
+ public:
+  explicit AutoChangeLengthListNotifier(T* aValue)
+      : mozAutoDocUpdate(aValue->Element()->GetComposedDoc(), true),
+        mValue(aValue) {
+    MOZ_ASSERT(aValue, "Expecting non-null value");
+    mEmptyOrOldValue =
+        mValue->Element()->WillChangeLengthList(mValue->AttrEnum(), *this);
+  }
+
+  ~AutoChangeLengthListNotifier() {
+    mValue->Element()->DidChangeLengthList(mValue->AttrEnum(), mEmptyOrOldValue,
+                                           *this);
+    if (mValue->IsAnimating()) {
+      mValue->Element()->AnimationNeedsResample();
+    }
+  }
+
+ private:
+  T* const mValue;
+  nsAttrValue mEmptyOrOldValue;
+};
+
+/**
+ * Class DOMSVGLengthList
+ *
+ * This class is used to create the DOM tearoff objects that wrap internal
+ * SVGLengthList objects.
+ *
+ * See the architecture comment in DOMSVGAnimatedLengthList.h.
+ *
+ * This class is strongly intertwined with DOMSVGAnimatedLengthList and
+ * DOMSVGLength. We are a friend of DOMSVGAnimatedLengthList, and are
+ * responsible for nulling out our DOMSVGAnimatedLengthList's pointer to us
+ * when we die, essentially making its pointer to us a weak pointer. Similarly,
+ * our DOMSVGLength items are friends of us and responsible for nulling out our
+ * pointers to them.
+ *
+ * Our DOM items are created lazily on demand as and when script requests them.
+ */
+class DOMSVGLengthList final : public nsISupports, public nsWrapperCache {
+  template <class T>
+  friend class AutoChangeLengthListNotifier;
+  friend class DOMSVGLength;
+
+  ~DOMSVGLengthList() {
+    // Our mAList'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 mAList is null.
+    if (mAList) {
+      (IsAnimValList() ? mAList->mAnimVal : mAList->mBaseVal) = nullptr;
+    }
+  }
+
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_DOMSVGLENGTHLIST_IID)
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMSVGLengthList)
+
+  DOMSVGLengthList(DOMSVGAnimatedLengthList* aAList,
+                   const SVGLengthList& aInternalList)
+      : mAList(aAList) {
+    // aInternalList must be passed in explicitly because we can't use
+    // InternalList() here. (Because it depends on IsAnimValList, which depends
+    // on this object having been assigned to aAList's mBaseVal or mAnimVal,
+    // which hasn't happened yet.)
+
+    InternalListLengthWillChange(aInternalList.Length());  // Sync mItems
+  }
+
+  JSObject* WrapObject(JSContext* cx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  nsISupports* GetParentObject() { return static_cast<nsIContent*>(Element()); }
+
+  /**
+   * This will normally be the same as InternalList().Length(), except if we've
+   * hit OOM in which case our length will be zero.
+   */
+  uint32_t LengthNoFlush() const {
+    MOZ_ASSERT(
+        mItems.Length() == 0 || mItems.Length() == InternalList().Length(),
+        "DOM wrapper's list length is out of sync");
+    return mItems.Length();
+  }
+
+  /// Called to notify us to synchronize our length and detach excess items.
+  void InternalListLengthWillChange(uint32_t aNewLength);
+
+  /**
+   * Returns true if our attribute is animating (in which case our animVal is
+   * not simply a mirror of our baseVal).
+   */
+  bool IsAnimating() const { return mAList->IsAnimating(); }
+  /**
+   * Returns true if there is an animated list mirroring the base list.
+   */
+  bool AnimListMirrorsBaseList() const {
+    return mAList->mAnimVal && !mAList->IsAnimating();
+  }
+
+  uint32_t NumberOfItems() const {
+    if (IsAnimValList()) {
+      Element()->FlushAnimations();
+    }
+    return LengthNoFlush();
+  }
+  void Clear(ErrorResult& aError);
+  already_AddRefed<DOMSVGLength> Initialize(DOMSVGLength& newItem,
+                                            ErrorResult& error);
+  already_AddRefed<DOMSVGLength> GetItem(uint32_t index, ErrorResult& error);
+  already_AddRefed<DOMSVGLength> IndexedGetter(uint32_t index, bool& found,
+                                               ErrorResult& error);
+  already_AddRefed<DOMSVGLength> InsertItemBefore(DOMSVGLength& newItem,
+                                                  uint32_t index,
+                                                  ErrorResult& error);
+  already_AddRefed<DOMSVGLength> ReplaceItem(DOMSVGLength& newItem,
+                                             uint32_t index,
+                                             ErrorResult& error);
+  already_AddRefed<DOMSVGLength> RemoveItem(uint32_t index, ErrorResult& error);
+  already_AddRefed<DOMSVGLength> AppendItem(DOMSVGLength& newItem,
+                                            ErrorResult& error) {
+    return InsertItemBefore(newItem, LengthNoFlush(), error);
+  }
+  void IndexedSetter(uint32_t index, DOMSVGLength& newValue,
+                     ErrorResult& error);
+  uint32_t Length() const { return NumberOfItems(); }
+
+ private:
+  dom::SVGElement* Element() const { return mAList->mElement; }
+
+  uint8_t AttrEnum() const { return mAList->mAttrEnum; }
+
+  uint8_t Axis() const { return mAList->mAxis; }
+
+  /// Used to determine if this list is the baseVal or animVal list.
+  bool IsAnimValList() const {
+    MOZ_ASSERT(this == mAList->mBaseVal || this == mAList->mAnimVal,
+               "Calling IsAnimValList() too early?!");
+    return this == mAList->mAnimVal;
+  }
+
+  /**
+   * Get a reference to this object's corresponding internal SVGLengthList.
+   *
+   * To simplify the code we just have this one method for obtaining both
+   * baseVal and animVal internal lists. This means that animVal lists don't
+   * get const protection, but our setter methods guard against changing
+   * animVal lists.
+   */
+  SVGLengthList& InternalList() const;
+
+  /// Returns the DOMSVGLength at aIndex, creating it if necessary.
+  already_AddRefed<DOMSVGLength> GetItemAt(uint32_t aIndex);
+
+  void MaybeInsertNullInAnimValListAt(uint32_t aIndex);
+  void MaybeRemoveItemFromAnimValListAt(uint32_t aIndex);
+
+  // Weak refs to our DOMSVGLength items. The items are friends and take care
+  // of clearing our pointer to them when they die.
+  FallibleTArray<DOMSVGLength*> mItems;
+
+  RefPtr<DOMSVGAnimatedLengthList> mAList;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(DOMSVGLengthList, MOZILLA_DOMSVGLENGTHLIST_IID)
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // DOM_SVG_DOMSVGLENGTHLIST_H_