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-rw-r--r--layout/base/DepthOrderedFrameList.cpp63
1 files changed, 63 insertions, 0 deletions
diff --git a/layout/base/DepthOrderedFrameList.cpp b/layout/base/DepthOrderedFrameList.cpp
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+++ b/layout/base/DepthOrderedFrameList.cpp
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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/. */
+
+#include "DepthOrderedFrameList.h"
+#include "nsIFrame.h"
+#include "nsContainerFrame.h"
+
+namespace mozilla {
+
+void DepthOrderedFrameList::Add(nsIFrame* aFrame) {
+ // Is this root already scheduled for reflow?
+ // FIXME: This could possibly be changed to a uniqueness assertion, with some
+ // work in ResizeReflowIgnoreOverride (and maybe others?)
+ // FIXME(emilio): Should probably reuse the traversal for insertion.
+ if (Contains(aFrame)) {
+ // We don't expect frame to change depths.
+ MOZ_ASSERT(aFrame->GetDepthInFrameTree() ==
+ mList[mList.IndexOf(aFrame)].mDepth);
+ return;
+ }
+
+ mList.InsertElementSorted(
+ FrameAndDepth{aFrame, aFrame->GetDepthInFrameTree()},
+ FrameAndDepth::CompareByReverseDepth{});
+}
+
+void DepthOrderedFrameList::Remove(nsIFrame* aFrame) {
+ mList.RemoveElement(aFrame);
+}
+
+nsIFrame* DepthOrderedFrameList::PopShallowestRoot() {
+ // List is sorted in order of decreasing depth, so there are no shallower
+ // frames than the last one.
+ const FrameAndDepth& lastFAD = mList.PopLastElement();
+ nsIFrame* frame = lastFAD.mFrame;
+ // We don't expect frame to change depths.
+ MOZ_ASSERT(frame->GetDepthInFrameTree() == lastFAD.mDepth);
+ return frame;
+}
+
+bool DepthOrderedFrameList::FrameIsAncestorOfAnyElement(
+ nsIFrame* aFrame) const {
+ MOZ_ASSERT(aFrame);
+
+ // Look for a path from any element to aFrame, following GetParent(). This
+ // check mirrors what FrameNeedsReflow() would have done if the reflow root
+ // didn't get in the way.
+ for (nsIFrame* f : mList) {
+ do {
+ if (f == aFrame) {
+ return true;
+ }
+ f = f->GetParent();
+ } while (f);
+ }
+
+ return false;
+}
+
+} // namespace mozilla