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/* 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
#ifndef mozilla_ScrollState_h
#define mozilla_ScrollState_h
#include <cstdint>
#include "nsPoint.h"
namespace mozilla {
/**
* The state of a ScrollContainerFrame that outlives the frame itself, either
* across a frame reconstruction (stored on the element), or across navigations
* (stored in session history as a PresState).
*/
struct ScrollState {
// For frames where layout and visual viewport aren't one and the same thing,
// this is the position of the *visual* viewport.
nsPoint mScrollPosition;
// Only meaningful for root scroll frames.
float mResolution = 1.0f;
// Scroll event generations are per-PresShell, so they're only restored
// within the same document, and never end up in session history.
uint32_t mScrollEventGeneration = 0;
uint32_t mScrollEndEventGeneration = 0;
bool mAllowScrollOriginDowngrade = true;
};
} // namespace mozilla
#endif