forked from mirrors/gecko-dev
ae192ec3a5
Summary of the changes/reasons: - LayoutTelemetryTools.h directly uses several types whose headers it needs to include. (These includes were present in its .cpp file; I'm migrating them from there to the .h file, and I'm adding a new include for "Saturate.h" to provide the SaturateUint8 type.) - LayoutTelemetryTools.cpp needs an include for MainThreadUtils.h, to provide NS_IsMainThread(). - StaticPresData.cpp needs an include for ServoUtils.h, to provide AssertIsMainThreadOrServoFontMetricsLocked(). - ZoomConstraintsClient.h needs a forward-decl for mozilla::dom::Document since it uses a pointer of that type in a function-decl. - ScrollSnap.h needs forward-decls of nsPoint/nsRect for some references to those types in a method signature. - nsGridContainerFrame.cpp needs an include for nsBoxLayoutState.h since it uses that type (it instantiates a nsBoxLayoutState instance). - nsPlaceholderFrame.cpp needs a "using" decl for the mozilla::dom namespace in order to use the un-namespace-prefixed "Element" type. Differential Revision: https://phabricator.services.mozilla.com/D61603 --HG-- extra : moz-landing-system : lando
45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_layout_ScrollSnap_h_
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#define mozilla_layout_ScrollSnap_h_
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#include "mozilla/ScrollTypes.h"
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#include "mozilla/Maybe.h"
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struct nsPoint;
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struct nsRect;
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namespace mozilla {
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namespace layers {
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struct ScrollSnapInfo;
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}
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struct ScrollSnapUtils {
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/**
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* GetSnapPointForDestination determines which point to snap to after
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* scrolling. |aStartPos| gives the position before scrolling and
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* |aDestination| gives the position after scrolling, with no snapping.
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* Behaviour is dependent on the value of |aUnit|.
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* |aSnapInfo| and |aScrollRange| are characteristics of the scroll frame for
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* which snapping is being performed.
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* If a suitable snap point could be found, it is returned. Otherwise, an
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* empty Maybe is returned.
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* IMPORTANT NOTE: This function is designed to be called both on and off
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* the main thread. If modifying its implementation, be sure
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* not to touch main-thread-only data structures without
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* appropriate locking.
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*/
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static mozilla::Maybe<nsPoint> GetSnapPointForDestination(
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const layers::ScrollSnapInfo& aSnapInfo, ScrollUnit aUnit,
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const nsRect& aScrollRange, const nsPoint& aStartPos,
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const nsPoint& aDestination);
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};
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} // namespace mozilla
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#endif // mozilla_layout_ScrollSnap_h_
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