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Obliterate some flexboxes in the room list

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We don't need columns of divs to equally size themselves, so use easier layout techniques to make the list fit in the container. We have to take a hit with `height:100%`, but the hit is much more insignificant than confusing the layout engine.

The layout engine has a hard time with dynamically-but-statically-sized stuff like `width: 100%; display: flex;`, particularly when it is nested so badly. Overall this should improve performance for the app by not having to re-paint so often.

Fixes https://github.com/vector-im/riot-web/issues/14639
This commit is contained in:
Travis Ralston 2020-07-22 16:34:33 -06:00
parent c22cb6c325
commit 80687e358f
3 changed files with 2 additions and 26 deletions
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13
res/css/structures/_LeftPanel.scss
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@ -135,12 +135,7 @@ $tagPanelWidth: 56px; // only applies in this file, used for calculations
}
.mx_LeftPanel_roomListWrapper {
// Create a flexbox to ensure the containing items cause appropriate overflow.
display: flex;
flex-grow: 1;
overflow: hidden;
min-height: 0;
margin-top: 10px; // so we're not up against the search/filter
&.mx_LeftPanel_roomListWrapper_stickyBottom {
@ -153,14 +148,8 @@ $tagPanelWidth: 56px; // only applies in this file, used for calculations
}
.mx_LeftPanel_actualRoomListContainer {
flex-grow: 1; // fill the available space
overflow-y: auto;
width: 100%;
max-width: 100%;
position: relative; // for sticky headers
// Create a flexbox to trick the layout engine
display: flex;
height: 100%; // ensure scrolling still works
}
}

8
res/css/views/rooms/_RoomList.scss
View file

@ -15,11 +15,5 @@ limitations under the License.
*/
.mx_RoomList {
width: calc(100% - 16px); // 16px of artificial right-side margin (8px is overflowed from the sublists)
// Create a column-based flexbox for the sublists. That's pretty much all we have to
// worry about in this stylesheet.
display: flex;
flex-direction: column;
flex-wrap: nowrap; // let the column overflow
padding-right: 7px; // width of the scrollbar, to line things up
}

7
res/css/views/rooms/_RoomSublist.scss
View file

@ -15,15 +15,8 @@ limitations under the License.
*/
.mx_RoomSublist {
// The sublist is a column of rows, essentially
display: flex;
flex-direction: column;
margin-left: 8px;
margin-bottom: 4px;
width: 100%;
flex-shrink: 0; // to convince safari's layout engine the flexbox is fine
.mx_RoomSublist_headerContainer {
// Create a flexbox to make alignment easy