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scrolling.js
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scrolling.js
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/**
* Copyright (C) 2021 The Software Heritage developers
* See the AUTHORS file at the top-level directory of this distribution
* License: GNU Affero General Public License version 3, or any later version
* See top-level LICENSE file for more information
*/
// adapted from https://stackoverflow.com/questions/4770025/how-to-disable-scrolling-temporarily
// up: 38, down: 40, spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36
const
keys
=
{
38
:
1
,
40
:
1
,
32
:
1
,
33
:
1
,
34
:
1
,
35
:
1
,
36
:
1
};
function
preventDefault
(
e
)
{
e
.
preventDefault
();
}
function
preventDefaultForScrollKeys
(
e
)
{
if
(
keys
[
e
.
keyCode
])
{
preventDefault
(
e
);
return
false
;
}
}
// modern Chrome requires { passive: false } when adding event
let
supportsPassive
=
false
;
try
{
window
.
addEventListener
(
'test'
,
null
,
Object
.
defineProperty
({},
'passive'
,
{
get
:
function
()
{
supportsPassive
=
true
;
}
}));
}
catch
(
e
)
{}
const
wheelOpt
=
supportsPassive
?
{
passive
:
false
}
:
false
;
const
wheelEvent
=
'onwheel'
in
document
.
createElement
(
'div'
)
?
'wheel'
:
'mousewheel'
;
export
function
disableScrolling
()
{
window
.
addEventListener
(
'DOMMouseScroll'
,
preventDefault
,
false
);
// older FF
window
.
addEventListener
(
wheelEvent
,
preventDefault
,
wheelOpt
);
// modern desktop
window
.
addEventListener
(
'touchmove'
,
preventDefault
,
wheelOpt
);
// mobile
window
.
addEventListener
(
'keydown'
,
preventDefaultForScrollKeys
,
false
);
}
export
function
enableScrolling
()
{
window
.
removeEventListener
(
'DOMMouseScroll'
,
preventDefault
,
false
);
window
.
removeEventListener
(
wheelEvent
,
preventDefault
,
wheelOpt
);
window
.
removeEventListener
(
'touchmove'
,
preventDefault
,
wheelOpt
);
window
.
removeEventListener
(
'keydown'
,
preventDefaultForScrollKeys
,
false
);
}
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