Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* The box a map is drawn in, and the four handles on its edges (§17.2).
*
* A square map's box is one number, its side (`ui/mapSize.ts`); a turned band's
* is two, its width and its depth (`ui/turnBox.ts`). Both are the session's, so
* that a deck of maps is one shape, and both are clamped on the way out to the
* room this panel has — measured against the panel rather than against the grid
* the box is in, which would follow the box down. This writes the box onto the
* grid as the custom properties the stylesheet lays the map and its lanes out
* from, lays the handles along the picture on every frame, and turns a drag or
* a key on one of them into a new size in the store.
*
* Out of `ui/MatrixPanel.ts` because it is layout and not data: it reads which
* presentation is on screen, and two rectangles off the renderer, and nothing
* of the block. How deep a band is cut to fill the box stays with the panel —
* `MatrixPanel.syncTurnDepth` re-cuts the turned block the panel holds and the
* axes measured from it, and asks this only how tall the box is.
*/
import type { HeatmapView } from '../render/heatmap'
import type { RotatedBlock } from '../render/rotate'
import type { AnnotationLanes } from './AnnotationLanes'
import { el } from './dom'
import { fitMapSize, getMapSize, setMapSize, subscribeMapSize } from './mapSize'
import type { MatrixPanel } from './MatrixPanel'
import {
MIN_TURN_HEIGHT,
MIN_TURN_WIDTH,
fitTurnBox,
getTurnBox,
setTurnBox as rememberTurnBox,
subscribeTurnBox,
type TurnBox,
} from './turnBox'
/**
* What the box needs of the panel: the renderer and the lane stacks it is laid
* out with, the two elements its size is written onto and read back from, and
* which presentation is on screen.
*/
export interface BoxHost {
/** The renderer: the rectangles the handles lie along, and a canvas to tell when its box changes. */
readonly heatmap: HeatmapView
/** The lane stacks, whose columns beside the map come out of the width a box has. */
readonly lanes: AnnotationLanes
/** The grid holding the map and its lanes, where the box is written; built after this is. */
grid(): HTMLElement
/** The map's own box inside the grid, whose `max-height` is the height a square map claims. */
wrap(): HTMLElement
/** The turned band on screen, or `null` for a square map: which picture's box this is. */
turned(): RotatedBlock | null
/** The grid's last measured size, which the room falls back on before the panel is laid out. */
hostSize(): { width: number; height: number }
/** Ask the panel for a frame. */
schedule(): void
}
/** The box one map is drawn in, its handles, and the room it has. */
export class MapBox {
/**
* The four edges of the picture, as things a hand can take hold of.
*
* Bars rather than strips of live canvas, and visible on approach rather than
* only under the pointer, because how big the picture is drawn is a decision
* the reader has to be able to *find* — a gesture nobody can see is a gesture
* nobody uses.
*
* Which of them are shown, and what a drag on one means, is the whole of the
* difference between the two presentations:
*
* - **A square map** shows all four, and every one sets the same number — the
* side of the box (`ui/mapSize.ts`). A square block has no shape to choose,
* so a box of another shape would be paper down two sides of the picture.
* - **A band** shows three. Its width and its depth are separate numbers
* (`ui/turnBox.ts`), and its fourth edge is the diagonal itself: the band
* stands on the axis, so there is nothing to drag there. Which of the
* horizontal pair is the far edge follows the direction the band grows in —
* up on an ordinary turn, down on the mirrored half of a comparison.
*/
readonly grips: Record<PlotEdge, HTMLElement> = {
top: plotGrip('top'),
bottom: plotGrip('bottom'),
left: plotGrip('left'),
right: plotGrip('right'),
}
/** Which presentation the grips are labelled for; see {@link placeGrips}. */
private gripMode: 'square' | 'band' | null = null
/** The room the box has, measured once per resize. See {@link measureRoom}. */
private room: { width: number; height: number } | null = null
private readonly unsubscribeTurnBox: () => void
private readonly unsubscribeMapSize: () => void
private readonly heatmap: HeatmapView
private readonly lanes: AnnotationLanes
constructor(private readonly host: BoxHost) {
this.heatmap = host.heatmap
this.lanes = host.lanes
// Every panel, not only the one whose handle was dragged: the box is the
// session's, so a deck of bands is one shape (§17.3).
this.unsubscribeTurnBox = subscribeTurnBox(() => this.applyTurnBox())
// The square map's own size, on the same terms and through the same call: one
// reader, one shape, however many pictures are drawn from it.
this.unsubscribeMapSize = subscribeMapSize(() => this.applyTurnBox())
this.watchGrips()
}
/** The turned band on screen, as the panel holds it now. */
private get turned(): RotatedBlock | null {
return this.host.turned()
}
/** The grid the box is written onto. */
private get grid(): HTMLElement {
return this.host.grid()
}
/** The map's own box, which the room's height is read back off. */
private get wrap(): HTMLElement {
return this.host.wrap()
}
/**
* Take the room again, and redraw the box in it.
*
* Every road into this panel from a change of *space* ends here, and there are
* four of them: the shell folding a column ({@link MatrixPanel.remeasure}),
* the view's own `ResizeObserver` for a window resize or a lane appearing, a
* turn arriving or leaving, and a deck relaying out. They used to end in
* different places and only some of them redrew the box, so a turned band
* kept the width of the window it was first drawn in: folding two columns gave
* the map three hundred pixels it never took, and adding a track under it left
* the band as wide as it was before the stack was there.
*
* A square map needs none of this — its canvas is sized by the stylesheet, and
* `HeatmapView.resize` reads that — which is exactly why the turned one was
* missed: it is the one picture in the app whose size is a number this class
* computes.
*
* The band's *depth* follows on the next frame with nothing to arrange:
* {@link MatrixPanel.syncTurnDepth} runs before every draw and re-cuts the
* band whenever the box it has to fill has changed shape.
*
* Idempotent, and it has to be: writing the box resizes the grid, which is what
* the observer is watching. The room is measured against the *panel* and never
* against the grid the box is in ({@link measureRoom}), so a second pass over
* the same window computes the same numbers and the loop stops on the first
* repeat.
*/
refit(): void {
this.measureRoom()
this.writeTurnBox()
}
/**
* Lay the size handles along the edges of the picture.
*
* Placed from the measured rectangles on every frame, exactly as the key is, so
* they follow a pan and a zoom with nothing to keep in step.
*
* The **plot** frame for a square map, on all four edges: the plot is what a
* reader sees as the map — the canvas around it is the gutter its axis labels
* live in — and the box being dragged is the canvas, so a handle on the frame
* is the honest place to take hold of it.
*
* The band keeps the rectangle each of its own handles was always on. Its far
* edge follows the **data**, because a band is as wide as its block while the
* plot is as wide as the panel, and a bar across the plot would run out past
* the picture at every zoom that does not fill it. Its two ends follow the
* *plot*'s height for the opposite reason: a band fills its box vertically by
* construction, so a handle that stopped at the last column would sit in the
* middle of the picture pointing at nothing.
*/
placeGrips(): void {
const turned = this.turned
const plot = this.heatmap.plotRect
const data = this.heatmap.dataRect
// `down` is the mirrored half of a comparison, where separation grows towards
// the bottom of the picture and the far edge is the bottom one. The other
// horizontal edge is the diagonal the band stands on, and is not a handle.
//
// A **mirrored pair** has no idle edge at all: the diagonal is in the middle
// of the picture, both horizontal edges are far edges, and each of them sets
// the same one number — how tall the box is — from its own side.
const idle: PlotEdge | null =
turned === null || turned.fold !== undefined
? null
: turned.direction === 'up'
? 'bottom'
: 'top'
for (const edge of ['top', 'bottom', 'left', 'right'] as const) {
this.grips[edge].classList.toggle('hidden', edge === idle)
}
this.labelGrips(turned === null ? 'square' : 'band')
for (const edge of ['left', 'right'] as const) {
const grip = this.grips[edge]
grip.style.top = `${Math.round(plot.y)}px`
grip.style.height = `${Math.round(plot.height)}px`
grip.style.left = `${Math.round(edge === 'left' ? plot.x : plot.x + plot.width)}px`
}
for (const edge of ['top', 'bottom'] as const) {
if (edge === idle) continue
const grip = this.grips[edge]
// The band's far edge sits on the data; a square map's edges are the frame.
const box = turned === null ? plot : data
grip.style.top = `${Math.round(edge === 'top' ? box.y : box.y + box.height)}px`
grip.style.left = `${Math.round(box.x)}px`
grip.style.width = `${Math.round(box.width)}px`
}
}
/**
* What the handles say they do, which is not the same thing in the two
* presentations.
*
* Written when the presentation changes rather than on every frame: a title is
* a DOM write, and {@link placeGrips} runs before every draw.
*/
private labelGrips(mode: 'square' | 'band'): void {
if (mode === this.gripMode) return
this.gripMode = mode
const same = 'Double-click for as much room as there is.'
for (const edge of ['top', 'bottom', 'left', 'right'] as const) {
this.grips[edge].title =
mode === 'square'
? `Drag to set how big this map is drawn — every edge sets the same size, because a ` +
`square block has no shape to choose. ${same}`
: edgeAxis(edge) === 'y'
? `Drag to set how tall this band is drawn. The distance from the diagonal it ` +
`reaches follows from the zoom — the box keeps its shape and the picture fills ` +
`it. ${same}`
: `Drag to set how wide this band is drawn. Both ends move, so the box stays ` +
`centred, and the tracks under it follow. ${same}`
}
}
/**
* A drag on a handle sets how big the picture is drawn.
*
* Pixels, straight through: a handle is on the edge of a box measured in them,
* so the edge goes exactly where the hand puts it. What each of the four edges
* *means* is read at the moment of the drag rather than wired once, because the
* same edge belongs to two pictures — the left edge of a band is one end of its
* width, and the left edge of a square map is one side of its size — and a
* panel changes between them under the reader's hand.
*
* The **band** keeps the numbers it always had (`ui/turnBox.ts`): its far
* horizontal edge is the depth, its two ends are the width, and the width moves
* at twice the hand because the box is centred — the edge under the pointer has
* to stay under it, so the far end goes out by the same amount.
*
* A **square map** has one number and every edge sets it (`ui/mapSize.ts`). The
* two ends move it at twice the hand, for the same centring reason. The two
* horizontal edges move it at once: the picture hangs from the stack above it,
* so its top is where the panel starts and a taller box grows downward. The top
* handle therefore reads as *out is bigger* rather than as an edge that follows
* the pointer — which is what an edge handle means anyway, and the alternative
* is a picture that floats in the middle of a reserved column with its tracks
* detached from it.
*
* Keyboard too, because this is the only way to reach the number without a
* pointer and a `role="separator"` that answers no keys is a control that says
* it is one.
*/
private watchGrips(): void {
for (const edge of ['top', 'bottom', 'left', 'right'] as const) {
const axis = edgeAxis(edge)
// Out of the box: left and up are negative on screen, right and down are
// positive, and "out" is whichever of them leaves the picture's middle.
const away = edge === 'left' || edge === 'top' ? -1 : 1
this.dragEdge(this.grips[edge], {
axis,
away: () => away,
held: () =>
this.turned === null
? this.mapSize()
: axis === 'x'
? this.turnBox().width
: this.turnBox().height,
// Both ends of a centred box move; one horizontal edge moves alone.
gain: axis === 'x' ? 2 : 1,
set: (value) => {
if (this.turned === null) setMapSize(value)
else if (axis === 'x') this.setTurnBox({ width: value })
else this.setTurnBox({ height: value })
},
reset: () => {
if (this.turned === null) setMapSize(null)
else if (axis === 'x') this.setTurnBox({ width: null })
else this.setTurnBox({ height: null })
},
})
}
}
/**
* One edge of the box, as something a hand or a keyboard can move.
*
* The four handles differ in three numbers and nothing else — which axis they
* travel on, which way out of the box is, and how much the box grows per pixel
* travelled — so they are one gesture parameterised rather than four listeners
* that have to be kept saying the same thing.
*/
private dragEdge(
grip: HTMLElement,
rule: {
axis: 'x' | 'y'
away: () => number
held: () => number
gain: number
set(value: number): void
reset(): void
},
): void {
let from: { at: number; size: number } | null = null
const onDown = (event: PointerEvent): void => {
// No guard on the presentation any more: both of them have a size for this
// handle to move, and the one edge that has none — the diagonal a band
// stands on — is hidden rather than inert ({@link placeGrips}).
if (event.button !== 0) return
event.preventDefault()
event.stopPropagation()
from = { at: rule.axis === 'x' ? event.clientX : event.clientY, size: rule.held() }
grip.setPointerCapture(event.pointerId)
grip.classList.add('is-dragging')
}
const onMove = (event: PointerEvent): void => {
if (from === null) return
const now = rule.axis === 'x' ? event.clientX : event.clientY
rule.set(from.size + (now - from.at) * rule.away() * rule.gain)
}
const onUp = (event: PointerEvent): void => {
if (from === null) return
from = null
grip.releasePointerCapture(event.pointerId)
grip.classList.remove('is-dragging')
}
const onKey = (event: KeyboardEvent): void => {
const size = rule.held()
// A tenth of the box per press, a half with Shift — the step the map's own
// arrow keys pan by, so one hand learns one rule.
const step = Math.max(1, Math.round(size * (event.shiftKey ? 0.5 : 0.1)))
const grow = rule.axis === 'x' ? 'ArrowRight' : 'ArrowUp'
const shrink = rule.axis === 'x' ? 'ArrowLeft' : 'ArrowDown'
if (event.key === grow) rule.set(size + step)
else if (event.key === shrink) rule.set(size - step)
else if (event.key === 'Home' || event.key === '0') rule.reset()
else return
event.preventDefault()
}
grip.addEventListener('pointerdown', onDown)
grip.addEventListener('pointermove', onMove)
grip.addEventListener('pointerup', onUp)
grip.addEventListener('pointercancel', onUp)
grip.addEventListener('keydown', onKey)
// A double-click puts the default back, which is the way out of an edge
// dragged somewhere useless.
grip.addEventListener('dblclick', () => rule.reset())
}
/**
* The box a turned map is drawn in, in CSS pixels.
*
* The reader's, where they have said (`ui/turnBox.ts`), and otherwise a
* default expressed against the width — a third of it, which is the shape of
* the figures this is a viewer for. A rule and not a number, which is why what
* the store holds on an untouched axis is `null`: "as wide as there is room
* for" cannot be written down as a width, since the room changes with the
* window and the number would not.
*
* Clamped on the way **out** rather than only where the reader drags. What is
* stored is one box for the session and the panels drawing from it need not
* have the same room — a deck of four is four narrower panels — so a box the
* reader shaped beside one map has to be readable as "and as much of that as
* fits" beside the next. Which is also what makes the size survive a window
* resize: it is remembered whole and drawn to fit.
*/
turnBox(): { width: number; height: number } {
return fitTurnBox(getTurnBox(), this.turnRoom())
}
/**
* How much room there is to draw the box in, in CSS pixels.
*
* Measured against the **panel**, and never against the grid the box is in.
* The grid is sized by its contents, so a box narrowed by a drag narrows the
* grid with it — and a ceiling read from there is a ceiling that follows the
* box down. That is what made the ends of the band a one-way control: every
* drag inwards lowered the limit to wherever the edge had just got to, so the
* width could be given away and never taken back.
*
* Both numbers are the room a *map* has, which is not the room the panel has:
* a stack of tracks beside or under the picture is drawn out of the same
* budget, and a box sized to the whole of it would push its own tracks off the
* edge. What is left after them is the difference between the grid and the
* map's own box, which is a fact about the tracks and does not move when the
* box does.
*
* The height is the one a square map would have claimed — `--map-budget`, read
* back off the grid's `min-height`, which §17.2 already reserves so that
* turning the map does not resize the panel. Growing past it would push the
* page down, and the panel would grow again on the next drag: a ceiling that
* rises as you press on it is not a ceiling.
*/
private turnRoom(): { width: number; height: number } {
return this.room ?? this.measureRoom()
}
/**
* Measure it, and keep the answer.
*
* Cached because {@link turnBox} is read on every frame — the depth the band
* is cut to is a function of the box and the zoom — and this is four layout
* reads and a `getComputedStyle`, which is a synchronous relayout of the
* document per frame of every pan. Refreshed where the room can actually have
* changed, which is a resize of the panel, and it is the resize observer that
* says so.
*/
measureRoom(): { width: number; height: number } {
const body = this.grid.parentElement
// The stacks themselves, rather than whatever is left of the grid once the
// map is taken out of it: the grid is held open at the height a square map
// would have claimed, so "the grid less the map" is mostly *slack*, and a
// ceiling computed from it would shrink by exactly as much as the box grew.
// Nothing to subtract on the vertical, where `--map-budget` has already
// taken the stacks out of the window for itself — subtracting them again is
// how a map with ten tracks under it got a ceiling below its own floor, and
// every drag of the top edge collapsed the band to the minimum.
const beside =
this.lanes.canvasFor('left').clientWidth + this.lanes.canvasFor('right').clientWidth
const width = (body?.clientWidth ?? this.host.hostSize().width) - beside
// The wrap's `max-height` rather than the custom property it is written
// from: a custom property comes back as the `clamp()` that was written,
// unresolved, and the number wanted here is the one the browser worked out
// from it. It is the height a square map would have claimed, which is the
// point past which a band has stopped being one.
const budget = Number.parseFloat(getComputedStyle(this.wrap).maxHeight)
const height = Number.isFinite(budget) ? budget : this.host.hostSize().height
this.room = {
width: Math.max(MIN_TURN_WIDTH, Math.round(width)),
height: Math.max(MIN_TURN_HEIGHT, Math.round(height)),
}
return this.room
}
/**
* Write the box onto the grid, and put the handles where its edges are.
*
* The size lives in CSS custom properties rather than in inline widths so that
* the map, the lane stacks under it and the centring are one layout decided in
* one place — the stacks take their width from the map's canvas, so a box that
* narrowed only the map would leave the tracks pointing at the wrong base
* pairs (`ui/AnnotationLanes.ts`).
*/
private writeTurnBox(): void {
const turned = this.turned !== null
this.grid.classList.toggle('is-turned', turned)
if (!turned) {
this.grid.style.removeProperty('--turn-width')
this.grid.style.removeProperty('--turn-height')
// A square map's side, on the same terms: one number, written where the
// stylesheet's own default sits so that the default is what an unset size
// falls back to (`--map-size` defaults to `--map-budget` in `styles.css`).
// Written on every refit rather than only on a drag, because "as much as
// there is" is a rule and the room moves under it.
this.grid.style.setProperty('--map-size', `${Math.round(this.mapSize())}px`)
return
}
this.grid.style.removeProperty('--map-size')
const box = this.turnBox()
this.grid.style.setProperty('--turn-width', `${Math.round(box.width)}px`)
this.grid.style.setProperty('--turn-height', `${Math.round(box.height)}px`)
}
/**
* The side a square map is drawn at, in CSS pixels.
*
* {@link turnBox}'s counterpart, and clamped on the way out for the same
* reasons: what is stored is one number for the session, the panels drawing
* from it need not have the same room, and "as much as there is" is a rule that
* has to be re-read whenever the room changes rather than a width remembered
* from another window.
*/
private mapSize(): number {
return fitMapSize(getMapSize(), this.turnRoom())
}
/**
* Resize the box, in CSS pixels. `null` on either axis puts the default back.
*
* Written to the store rather than to a field here, so it outlives this panel:
* a change of resolution or of chromosome destroys the panel and builds
* another, and a box held on the instance is one the reader loses the first
* time they go and look at something in it (`ui/turnBox.ts`).
*
* Clamped against the panel rather than against the block — the box is a fact
* about the figure, so what bounds it is how much room there is to draw in —
* and against *this* panel's room, which is the one the hand is in. Reading it
* back clamps again, for the panels the hand is not in.
*/
private setTurnBox(next: { width?: number | null; height?: number | null }): void {
const room = this.turnRoom()
const fit = (value: number, low: number, high: number): number =>
Math.max(low, Math.min(high, Math.round(value)))
const asked: Partial<TurnBox> = {}
if (next.width !== undefined) {
asked.width = next.width === null ? null : fit(next.width, MIN_TURN_WIDTH, room.width)
}
if (next.height !== undefined) {
asked.height = next.height === null ? null : fit(next.height, MIN_TURN_HEIGHT, room.height)
}
rememberTurnBox(asked)
}
/**
* Draw the box at whatever size it now is.
*
* The subscription's half of the resize, and every panel runs it — the one the
* hand is in and the others of a deck, which is what keeps a deck of bands one
* shape (§17.3). Both presentations arrive here: a square map has a size to be
* drawn at too, and the panel the hand is *not* in has to follow it.
*/
private applyTurnBox(): void {
this.writeTurnBox()
// The canvas has a new CSS size, and nothing else will tell the view: the
// resize observer watches the *grid*, whose own size need not have changed.
this.heatmap.resize()
this.host.schedule()
}
/** Stop following the session's two sizes: the panel is going away. */
destroy(): void {
this.unsubscribeTurnBox()
this.unsubscribeMapSize()
}
}
/** One edge of the picture; see {@link MapBox.grips}. */
type PlotEdge = 'top' | 'bottom' | 'left' | 'right'
/** Whether an edge is dragged along x or along y. */
function edgeAxis(edge: PlotEdge): 'x' | 'y' {
return edge === 'left' || edge === 'right' ? 'x' : 'y'
}
/** One end of the turned band's box, as a bar a hand can take hold of. */
function plotGrip(edge: PlotEdge): HTMLElement {
const axis = edgeAxis(edge)
return el('div', {
class: `plot-grip plot-grip-${axis} plot-grip-${edge} hidden`,
attrs: {
role: 'separator',
// Which way the *separator* lies, which is across the axis it travels on.
'aria-orientation': axis === 'x' ? 'vertical' : 'horizontal',
tabindex: '0',
},
})
}
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