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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /layout/generic/ScrollOrigin.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/generic/ScrollOrigin.h')
-rw-r--r-- | layout/generic/ScrollOrigin.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/layout/generic/ScrollOrigin.h b/layout/generic/ScrollOrigin.h new file mode 100644 index 0000000000..edffa2d4f6 --- /dev/null +++ b/layout/generic/ScrollOrigin.h @@ -0,0 +1,66 @@ +/* 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_ScrollOrigin_h_ +#define mozilla_ScrollOrigin_h_ + +namespace mozilla { + +// A scroll origin is a bit of a combination of "what part of the code caused +// this scroll" and "what special properties does this scroll have, in the +// context of what caused it". See specific comments below. +enum class ScrollOrigin : uint8_t { + // This is used as an initial value for the "LastScrollOrigin" property on + // scrollable frames. It is not intended to be an actual scroll origin, but + // a sentinel value that indicates that there was no "last scroll". It is + // used similarly for the "LastSmoothScrollOrigin" property, to indicate + // no smooth scroll is in progress. + None, + + // This is a default value that we use when we don't know of a more specific + // value that we can use. + NotSpecified, + // The scroll came from APZ code. + Apz, + // The scroll came from an attempt at restoring a scroll position saved in + // the bfcache or history. + Restore, + // The scroll came from a "relative" scroll method like ScrollBy, where the + // scroll destination is indicated by a delta from the current position + // instead of an absolute value. + Relative, + // The scroll came from an attempt by the main thread to re-clamp the scroll + // position after a reflow. + Clamp, + + // The following scroll origins also are associated with prefs of the form + // general.smoothScroll.<origin>(.*) + // e.g. general.smoothScroll.lines indicates whether or not a scroll with + // origin Lines will be animated smoothly, and e.g. subprefs like + // general.smoothScroll.lines.durationMinMS control some of the animation + // timing behavior. + + // The scroll came from some sort of input that's not one of the above or + // below values. Generally this means it came from a content-exposed API, + // like window.scrollTo, but may also be from other sources that don't need + // any particular special handling. + Other, + // The scroll was originated by pixel-scrolling input device (e.g. precision + // mouse wheel). + Pixels, + // The scroll was originated by a line-scrolling input device (e.g. up/down + // keyboard buttons). + Lines, + // The scroll was originated by a page-scrolling input device (e.g. pgup/ + // pgdn keyboard buttons). + Pages, + // The scroll was originated by a mousewheel that scrolls by lines. + MouseWheel, + // The scroll was originated by moving the scrollbars. + Scrollbars, +}; + +} // namespace mozilla + +#endif // mozilla_ScrollOrigin_h_ |