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Prevent layout shift in `<overflow-menu>` items (#29831) 

There is a small layout shift in when active tab changes. Notice how the
actions SVG is unstable:


![](https://github.com/go-gitea/gitea/assets/115237/a6928e89-5d47-4a91-8f36-1fa22fddbce7)

This is because the active item with bold text is wider then the
inactive one. I have applied [this
trick](https://stackoverflow.com/a/32570813/808699) to prevent this
layout shift. It's only active inside `<overflow-menu>` because I wanted
to avoid changing HTML and doing it in regular JS would cause a flicker.
I don't expect us to introduce other similar menus without
`<overflow-menu>`, so that place is likely fine.


![after](https://github.com/go-gitea/gitea/assets/115237/d6089924-8de6-4ee0-8db4-15f16069a131)

I also changed the weight from 500 to 600, slightly reduced horizontal
padding, merged some tab-bar related CSS rules and a added a small
margin below repo-header so it does not look so crammed against the
buttons on top.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
This commit is contained in:
silverwind 2024-03-20 18:00:35 +01:00 committed by GitHub
parent 21151474e3
commit 99d7ef5091
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3 changed files with 41 additions and 11 deletions
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32
web_src/css/base.css
View File

@ -1778,15 +1778,6 @@ table th[data-sortt-desc] .svg {
border-color: var(--color-secondary);
}
.ui.tabular.menu .item {
padding: 11px 12px;
color: var(--color-text-light-2);
}
.ui.tabular.menu .item:hover {
color: var(--color-text);
}
.ui.tabular.menu .active.item,
.ui.tabular.menu .active.item:hover {
background: var(--color-body);
@ -1803,17 +1794,36 @@ table th[data-sortt-desc] .svg {
border-color: var(--color-secondary);
}
.ui.tabular.menu .item,
.ui.secondary.pointing.menu .item {
padding: 11px 12px !important;
color: var(--color-text-light-2);
}
.ui.tabular.menu .item:hover,
.ui.secondary.pointing.menu a.item:hover {
color: var(--color-text);
}
.ui.secondary.pointing.menu .active.item,
.ui.secondary.pointing.menu .active.item:hover,
.ui.secondary.pointing.menu .dropdown.item:hover,
.ui.secondary.pointing.menu a.item:hover {
.ui.secondary.pointing.menu .dropdown.item:hover {
color: var(--color-text-dark);
}
.ui.tabular.menu .active.item,
.ui.secondary.pointing.menu .active.item,
.resize-for-semibold::before {
font-weight: var(--font-weight-semibold);
}
.resize-for-semibold::before {
content: attr(data-text);
visibility: hidden;
display: block;
height: 0;
}
.ui.header {
color: var(--color-text);
}

1
web_src/css/repo/header.css
View File

@ -8,6 +8,7 @@
flex-flow: row wrap;
justify-content: space-between;
gap: 0.5rem;
margin-bottom: 4px;
}
.repo-header .flex-item {

19
web_src/js/webcomponents/overflow-menu.js
View File

@ -127,6 +127,25 @@ window.customElements.define('overflow-menu', class extends HTMLElement {
});
init() {
// for horizontal menus where fomantic boldens active items, prevent this bold text from
// enlarging the menu's active item replacing the text node with a div that renders a
// invisible pseudo-element that enlarges the box.
if (this.matches('.ui.secondary.pointing.menu, .ui.tabular.menu')) {
for (const item of this.querySelectorAll('.item')) {
for (const child of item.childNodes) {
if (child.nodeType === Node.TEXT_NODE) {
const text = child.textContent.trim(); // whitespace is insignificant inside flexbox
if (!text) continue;
const span = document.createElement('span');
span.classList.add('resize-for-semibold');
span.setAttribute('data-text', text);
span.textContent = text;
child.replaceWith(span);
}
}
}
}
// ResizeObserver triggers on initial render, so we don't manually call `updateItems` here which
// also avoids a full-page FOUC in Firefox that happens when `updateItems` is called too soon.
this.resizeObserver = new ResizeObserver((entries) => {