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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
% file, You can obtain one at http://mozilla.org/MPL/2.0/.
/* Scroll buttons */
/* Hide arrow buttons when there's nothing to scroll in that direction */
.menupopup-arrowscrollbox[scrolledtostart="true"]::part(scrollbutton-up),
.menupopup-arrowscrollbox[scrolledtoend="true"]::part(scrollbutton-down) {
visibility: collapse;
}
/* Prevent the scrolled contents of the menupopup from jumping vertically when
* the arrow buttons appear / disappear, by positioning ::part(scrollbox) in
* such a way that its edges are at the same position as the edges of
* arrowscrollbox regardless of scroll button visibility.
*/
.menupopup-arrowscrollbox:not([scrolledtostart="true"])::part(scrollbox) {
/* scrollbutton-up is visible; shift our top edge up by its height. */
margin-top: -16px;
}
.menupopup-arrowscrollbox:not([scrolledtoend="true"])::part(scrollbox) {
/* scrollbutton-down is visible; shift our bottom edge down by its height. */
margin-bottom: -16px;
}
.menupopup-arrowscrollbox::part(scrollbox-clip) {
/* In the space where the arrow buttons overlap the scrollbox, clip away the
* scrollbox so that nothing is shown behind the arrow button even if the
* button is transparent.
*/
overflow: hidden;
}
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