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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /layout/base/DepthOrderedFrameList.h
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/base/DepthOrderedFrameList.h')
-rw-r--r--layout/base/DepthOrderedFrameList.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/layout/base/DepthOrderedFrameList.h b/layout/base/DepthOrderedFrameList.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 mozilla_DepthOrderedFrameList_h
+#define mozilla_DepthOrderedFrameList_h
+
+#include "mozilla/ReverseIterator.h"
+#include "nsTArray.h"
+
+class nsIFrame;
+
+namespace mozilla {
+
+class DepthOrderedFrameList {
+ public:
+ // Add a dirty root.
+ void Add(nsIFrame* aFrame);
+ // Remove this frame if present.
+ void Remove(nsIFrame* aFrame);
+ // Remove and return one of the shallowest dirty roots from the list.
+ // (If two roots are at the same depth, order is indeterminate.)
+ nsIFrame* PopShallowestRoot();
+ // Remove all dirty roots.
+ void Clear() { mList.Clear(); }
+ // Is this frame one of the elements in the list?
+ bool Contains(nsIFrame* aFrame) const { return mList.Contains(aFrame); }
+ // Are there no elements?
+ bool IsEmpty() const { return mList.IsEmpty(); }
+
+ // Is the given frame an ancestor of any dirty root?
+ bool FrameIsAncestorOfAnyElement(nsIFrame* aFrame) const;
+
+ auto IterFromShallowest() const { return Reversed(mList); }
+
+ private:
+ struct FrameAndDepth {
+ nsIFrame* mFrame;
+ const uint32_t mDepth;
+
+ // Easy conversion to nsIFrame*, as it's the most likely need.
+ operator nsIFrame*() const { return mFrame; }
+
+ // Used to sort by reverse depths, i.e., deeper < shallower.
+ class CompareByReverseDepth {
+ public:
+ bool Equals(const FrameAndDepth& aA, const FrameAndDepth& aB) const {
+ return aA.mDepth == aB.mDepth;
+ }
+ bool LessThan(const FrameAndDepth& aA, const FrameAndDepth& aB) const {
+ // Reverse depth! So '>' instead of '<'.
+ return aA.mDepth > aB.mDepth;
+ }
+ };
+ };
+ // List of all known dirty roots, sorted by decreasing depths.
+ nsTArray<FrameAndDepth> mList;
+};
+
+} // namespace mozilla
+
+#endif