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Unified Diff: third_party/WebKit/Source/core/page/scrolling/StickyPositionScrollingConstraints.h

Issue 1308273010: Adapt and reland old position sticky implementation (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: WIP - fix on release, still hits CHECK in LayoutGeometryMap.cpp:156 Created 4 years, 10 months ago
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Index: third_party/WebKit/Source/core/page/scrolling/StickyPositionScrollingConstraints.h
diff --git a/third_party/WebKit/Source/core/page/scrolling/StickyPositionScrollingConstraints.h b/third_party/WebKit/Source/core/page/scrolling/StickyPositionScrollingConstraints.h
new file mode 100644
index 0000000000000000000000000000000000000000..e9fd95b4609d0999039fee0c855a431ecdea6b31
--- /dev/null
+++ b/third_party/WebKit/Source/core/page/scrolling/StickyPositionScrollingConstraints.h
@@ -0,0 +1,85 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef StickyPositionScrollingConstraints_h
+#define StickyPositionScrollingConstraints_h
+
+#include "platform/geometry/FloatRect.h"
+
+namespace blink {
+
+class StickyPositionScrollingConstraints final {
+public:
+ enum AnchorEdgeFlags {
+ AnchorEdgeLeft = 1 << 0,
+ AnchorEdgeRight = 1 << 1,
+ AnchorEdgeTop = 1 << 2,
+ AnchorEdgeBottom = 1 << 3
+ };
+ typedef unsigned AnchorEdges;
+
+ StickyPositionScrollingConstraints()
+ : m_anchorEdges(0)
+ , m_leftOffset(0)
+ , m_rightOffset(0)
+ , m_topOffset(0)
+ , m_bottomOffset(0)
+ { }
+
+ StickyPositionScrollingConstraints(const StickyPositionScrollingConstraints& other)
+ : m_anchorEdges(other.m_anchorEdges)
+ , m_leftOffset(other.m_leftOffset)
+ , m_rightOffset(other.m_rightOffset)
+ , m_topOffset(other.m_topOffset)
+ , m_bottomOffset(other.m_bottomOffset)
+ , m_scrollContainerRelativeContainingBlockRect(other.m_scrollContainerRelativeContainingBlockRect)
+ , m_scrollContainerRelativeStickyBoxRect(other.m_scrollContainerRelativeStickyBoxRect)
+ { }
+
+ FloatSize computeStickyOffset(const FloatRect& viewportRect) const;
+
+ AnchorEdges anchorEdges() const { return m_anchorEdges; }
+ bool hasAnchorEdge(AnchorEdgeFlags flag) const { return m_anchorEdges & flag; }
+ void addAnchorEdge(AnchorEdgeFlags edgeFlag) { m_anchorEdges |= edgeFlag; }
+ void setAnchorEdges(AnchorEdges edges) { m_anchorEdges = edges; }
+
+ float leftOffset() const { return m_leftOffset; }
+ float rightOffset() const { return m_rightOffset; }
+ float topOffset() const { return m_topOffset; }
+ float bottomOffset() const { return m_bottomOffset; }
+
+ void setLeftOffset(float offset) { m_leftOffset = offset; }
+ void setRightOffset(float offset) { m_rightOffset = offset; }
+ void setTopOffset(float offset) { m_topOffset = offset; }
+ void setBottomOffset(float offset) { m_bottomOffset = offset; }
+
+ void setScrollContainerRelativeContainingBlockRect(const FloatRect& rect) { m_scrollContainerRelativeContainingBlockRect = rect; }
+
+ void setScrollContainerRelativeStickyBoxRect(const FloatRect& rect) { m_scrollContainerRelativeStickyBoxRect = rect; }
+
+ bool operator==(const StickyPositionScrollingConstraints& other) const
+ {
+ return m_leftOffset == other.m_leftOffset
+ && m_rightOffset == other.m_rightOffset
+ && m_topOffset == other.m_topOffset
+ && m_bottomOffset == other.m_bottomOffset
+ && m_scrollContainerRelativeContainingBlockRect == other.m_scrollContainerRelativeContainingBlockRect
+ && m_scrollContainerRelativeStickyBoxRect == other.m_scrollContainerRelativeStickyBoxRect;
+ }
+
+ bool operator!=(const StickyPositionScrollingConstraints& other) const { return !(*this == other); }
+
+private:
+ AnchorEdges m_anchorEdges;
+ float m_leftOffset;
+ float m_rightOffset;
+ float m_topOffset;
+ float m_bottomOffset;
+ FloatRect m_scrollContainerRelativeContainingBlockRect;
+ FloatRect m_scrollContainerRelativeStickyBoxRect;
+};
+
+} // namespace blink
+
+#endif // StickyPositionScrollingConstraints_h

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