1 files changed, 169 insertions, 0 deletions
diff --git a/layout/base/RestyleManagerBase.h b/layout/base/RestyleManagerBase.h
new file mode 100644
index 000000000..f81f5e73f
--- /dev/null
+++ b/layout/base/RestyleManagerBase.h
@@ -0,0 +1,169 @@
+/* -*- 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 mozilla_RestyleManagerBase_h
+#define mozilla_RestyleManagerBase_h
+
+#include "mozilla/OverflowChangedTracker.h"
+#include "nsChangeHint.h"
+#include "nsPresContext.h"
+
+class nsCString;
+class nsCSSFrameConstructor;
+class nsStyleChangeList;
+
+namespace mozilla {
+
+class EventStates;
+class RestyleManager;
+class ServoRestyleManager;
+
+namespace dom {
+class Element;
+}
+
+/**
+ * Class for sharing data and logic common to both RestyleManager and
+ * ServoRestyleManager.
+ */
+class RestyleManagerBase
+{
+protected:
+  explicit RestyleManagerBase(nsPresContext* aPresContext);
+
+public:
+  typedef mozilla::dom::Element Element;
+
+  // Get an integer that increments every time we process pending restyles.
+  // The value is never 0.
+  uint32_t GetRestyleGeneration() const { return mRestyleGeneration; }
+
+  // Get an integer that increments every time there is a style change
+  // as a result of a change to the :hover content state.
+  uint32_t GetHoverGeneration() const { return mHoverGeneration; }
+
+  bool ObservingRefreshDriver() const { return mObservingRefreshDriver; }
+
+  void SetObservingRefreshDriver(bool aObserving) {
+      mObservingRefreshDriver = aObserving;
+  }
+
+  void Disconnect() { mPresContext = nullptr; }
+
+  static nsCString RestyleHintToString(nsRestyleHint aHint);
+
+#ifdef DEBUG
+  static nsCString ChangeHintToString(nsChangeHint aHint);
+
+  /**
+   * DEBUG ONLY method to verify integrity of style tree versus frame tree
+   */
+  static void DebugVerifyStyleTree(nsIFrame* aFrame);
+#endif
+
+  void FlushOverflowChangedTracker() {
+    mOverflowChangedTracker.Flush();
+  }
+
+  // Should be called when a frame is going to be destroyed and
+  // WillDestroyFrameTree hasn't been called yet.
+  void NotifyDestroyingFrame(nsIFrame* aFrame) {
+    mOverflowChangedTracker.RemoveFrame(aFrame);
+  }
+
+  // Note: It's the caller's responsibility to make sure to wrap a
+  // ProcessRestyledFrames call in a view update batch and a script blocker.
+  // This function does not call ProcessAttachedQueue() on the binding manager.
+  // If the caller wants that to happen synchronously, it needs to handle that
+  // itself.
+  nsresult ProcessRestyledFrames(nsStyleChangeList& aChangeList);
+
+protected:
+  void ContentStateChangedInternal(Element* aElement,
+                                   EventStates aStateMask,
+                                   nsChangeHint* aOutChangeHint,
+                                   nsRestyleHint* aOutRestyleHint);
+
+  bool IsDisconnected() { return mPresContext == nullptr; }
+
+  void IncrementHoverGeneration() {
+    ++mHoverGeneration;
+  }
+
+  void IncrementRestyleGeneration() {
+    if (++mRestyleGeneration == 0) {
+      // Keep mRestyleGeneration from being 0, since that's what
+      // nsPresContext::GetRestyleGeneration returns when it no
+      // longer has a RestyleManager.
+      ++mRestyleGeneration;
+    }
+  }
+
+  nsPresContext* PresContext() const {
+    MOZ_ASSERT(mPresContext);
+    return mPresContext;
+  }
+
+  nsCSSFrameConstructor* FrameConstructor() const {
+    return PresContext()->FrameConstructor();
+  }
+
+  inline bool IsGecko() const {
+    return !IsServo();
+  }
+
+  inline bool IsServo() const {
+#ifdef MOZ_STYLO
+    return PresContext()->StyleSet()->IsServo();
+#else
+    return false;
+#endif
+  }
+
+private:
+  nsPresContext* mPresContext; // weak, can be null after Disconnect().
+  uint32_t mRestyleGeneration;
+  uint32_t mHoverGeneration;
+  // True if we're already waiting for a refresh notification.
+  bool mObservingRefreshDriver;
+
+protected:
+  // True if we're in the middle of a nsRefreshDriver refresh
+  bool mInStyleRefresh;
+
+  OverflowChangedTracker mOverflowChangedTracker;
+
+  void PostRestyleEventInternal(bool aForLazyConstruction);
+
+  /**
+   * These are protected static methods that help with the change hint
+   * processing bits of the restyle managers.
+   */
+  static nsIFrame*
+  GetNearestAncestorFrame(nsIContent* aContent);
+
+  static nsIFrame*
+  GetNextBlockInInlineSibling(FramePropertyTable* aPropTable, nsIFrame* aFrame);
+
+  /**
+   * Get the next continuation or similar ib-split sibling (assuming
+   * block/inline alternation), conditionally on it having the same style.
+   *
+   * Since this is used when deciding to copy the new style context, it
+   * takes as an argument the old style context to check if the style is
+   * the same.  When it is used in other contexts (i.e., where the next
+   * continuation would already have the new style context), the current
+   * style context should be passed.
+   */
+  static nsIFrame*
+  GetNextContinuationWithSameStyle(nsIFrame* aFrame,
+                                   nsStyleContext* aOldStyleContext,
+                                   bool* aHaveMoreContinuations = nullptr);
+};
+
+} // namespace mozilla
+
+#endif