mirror of https://github.com/requarks/wiki
NGPixel
2 weeks ago
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/*
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The brick transition: a toolbar whose right end stops being its own colour and becomes the editor's
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orange, through a staircase of brickwork rather than a straight edge.
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Used by the Visual editor's toolbar and the Markdown editor's preview toolbar, which is the whole
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reason this is a partial rather than a rule in either of them.
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*/
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/*
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The Sass variables, loaded explicitly. `vite.config.js` injects `theme` and `palette` into every SFC
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through `additionalData`, but that reaches only the files Vite itself hands to Sass -- a partial
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pulled in by `@use` arrives without them. Same note as `_visual-editor.scss` and `_page-contents.scss`.
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*/
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@use 'sass:color';
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@use 'palette' as *;
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/**
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* Lay the right end of a bar as brickwork stepping from `$cold` into `$hot`.
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*
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* Read the bar as five courses of brick. Counting in from the right edge, the last column has all
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* five of its bricks knocked out, the one before it four, then three, then two, then one -- so the
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* hot colour behind shows through as a staircase climbing to the right, the cold one thinning course
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* by course until the corner is hot all the way up.
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*
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* Where the two meet, the brick on either side of the step is laid in a lighter shade of its own
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* colour: one lighter cold and one lighter hot per course, each a single brick, so the seam reads as
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* two diagonals of highlighted brick running with the step rather than as a hard edge. In every
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* course the hot colour reaches column N and the cold one starts at N+1, which is what makes each of
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* those runs a clean diagonal.
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*
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* Fifteen background layers rather than a clip path or an SVG, in three groups. The last five are the
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* staircase: each one step, a hot rectangle anchored to the bottom-right corner, differing only in
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* `background-size` -- one brick wide by five courses tall, two by four, three by three, four by two,
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* five by one -- overlapping into the shape rather than tiling it, which is why they need no
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* coordinates of their own. The first ten are the seam, one brick each, and those DO need
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* coordinates: they are placed by offset from the right and top edges, a brick further along both per
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* course. Earlier layers paint over later ones, so the seam is listed first.
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*
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* Courses are percentages, so there are five of them whatever the bar's height turns out to be. A
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* brick's WIDTH is not a share of anything, so it comes from `$height` -- and a brick is square, which
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* makes the staircase exactly as wide as the bar is tall, its diagonal a true 45 degrees, and the
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* seam's offsets one and the same measure in both directions.
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*
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* `$deep-orange-9` is the default hot colour because that is what the actions rail turns while an
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* editor is open (`PageActionsCol`): the rail and the bar are on screen together, at opposite edges of
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* the same editor, so a second orange between them would read as a mistake rather than as a pair.
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*
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* The cold seam is emitted as a custom property, not baked into the layers, so that a bar whose own
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* colour changes with the theme can restate just that one line in its dark branch instead of the
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* whole stack. `$cold` is still required: it is what makes the default right for the common case, and
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* an unset `var()` here would take the entire `background-image` down with it.
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*
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* @param {Color} $cold The bar's own background colour, which the brickwork steps out of.
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* @param {Color} $hot The colour it steps into.
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* @param {Length} $height The bar's height. Five courses are cut from it, and a brick is one square.
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*/
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@mixin brick-transition($cold, $hot: $deep-orange-9, $height: 32px) {
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--brick: calc(#{$height} / 5);
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--seam-cold: #{color.adjust($cold, $lightness: 10%)};
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--seam-hot: #{color.adjust($hot, $lightness: 10%)};
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background-image:
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/* -> The seam, cold side: the last cold brick of each course */
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linear-gradient(var(--seam-cold), var(--seam-cold)),
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linear-gradient(var(--seam-cold), var(--seam-cold)),
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linear-gradient(var(--seam-cold), var(--seam-cold)),
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linear-gradient(var(--seam-cold), var(--seam-cold)),
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linear-gradient(var(--seam-cold), var(--seam-cold)),
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/* -> The seam, hot side: the first hot brick of each course */
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linear-gradient(var(--seam-hot), var(--seam-hot)),
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linear-gradient(var(--seam-hot), var(--seam-hot)),
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linear-gradient(var(--seam-hot), var(--seam-hot)),
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linear-gradient(var(--seam-hot), var(--seam-hot)),
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linear-gradient(var(--seam-hot), var(--seam-hot)),
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/* -> The staircase */
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linear-gradient($hot, $hot),
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linear-gradient($hot, $hot),
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linear-gradient($hot, $hot),
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linear-gradient($hot, $hot),
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linear-gradient($hot, $hot);
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background-repeat: no-repeat;
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background-position:
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/* -> Cold side: course 1 sits one brick in from the right, and each course one further */
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right calc(var(--brick) * 1) top calc(var(--brick) * 0),
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right calc(var(--brick) * 2) top calc(var(--brick) * 1),
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right calc(var(--brick) * 3) top calc(var(--brick) * 2),
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right calc(var(--brick) * 4) top calc(var(--brick) * 3),
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right calc(var(--brick) * 5) top calc(var(--brick) * 4),
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/* -> Hot side: the same diagonal, one column further right */
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right calc(var(--brick) * 0) top calc(var(--brick) * 0),
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right calc(var(--brick) * 1) top calc(var(--brick) * 1),
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right calc(var(--brick) * 2) top calc(var(--brick) * 2),
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right calc(var(--brick) * 3) top calc(var(--brick) * 3),
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right calc(var(--brick) * 4) top calc(var(--brick) * 4),
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right bottom,
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right bottom,
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right bottom,
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right bottom,
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right bottom;
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background-size:
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) var(--brick),
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var(--brick) 100%,
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calc(var(--brick) * 2) 80%,
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calc(var(--brick) * 3) 60%,
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calc(var(--brick) * 4) 40%,
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calc(var(--brick) * 5) 20%;
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}
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