import { Pos } from "../line/pos.js"
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import { cursorCoords, displayHeight, displayWidth, estimateCoords, paddingTop, paddingVert, scrollGap, textHeight } from "../measurement/position_measurement.js"
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import { gecko, phantom } from "../util/browser.js"
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import { elt } from "../util/dom.js"
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import { signalDOMEvent } from "../util/event.js"
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import { startWorker } from "./highlight_worker.js"
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import { alignHorizontally } from "./line_numbers.js"
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import { updateDisplaySimple } from "./update_display.js"
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// SCROLLING THINGS INTO VIEW
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// If an editor sits on the top or bottom of the window, partially
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// scrolled out of view, this ensures that the cursor is visible.
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export function maybeScrollWindow(cm, rect) {
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if (signalDOMEvent(cm, "scrollCursorIntoView")) return
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let display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null
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if (rect.top + box.top < 0) doScroll = true
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else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false
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if (doScroll != null && !phantom) {
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let scrollNode = elt("div", "\u200b", null, `position: absolute;
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top: ${rect.top - display.viewOffset - paddingTop(cm.display)}px;
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height: ${rect.bottom - rect.top + scrollGap(cm) + display.barHeight}px;
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left: ${rect.left}px; width: ${Math.max(2, rect.right - rect.left)}px;`)
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cm.display.lineSpace.appendChild(scrollNode)
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scrollNode.scrollIntoView(doScroll)
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cm.display.lineSpace.removeChild(scrollNode)
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}
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}
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// Scroll a given position into view (immediately), verifying that
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// it actually became visible (as line heights are accurately
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// measured, the position of something may 'drift' during drawing).
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export function scrollPosIntoView(cm, pos, end, margin) {
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if (margin == null) margin = 0
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let rect
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if (!cm.options.lineWrapping && pos == end) {
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// Set pos and end to the cursor positions around the character pos sticks to
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// If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
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// If pos == Pos(_, 0, "before"), pos and end are unchanged
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pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos
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end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos
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}
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for (let limit = 0; limit < 5; limit++) {
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let changed = false
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let coords = cursorCoords(cm, pos)
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let endCoords = !end || end == pos ? coords : cursorCoords(cm, end)
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rect = {left: Math.min(coords.left, endCoords.left),
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top: Math.min(coords.top, endCoords.top) - margin,
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right: Math.max(coords.left, endCoords.left),
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bottom: Math.max(coords.bottom, endCoords.bottom) + margin}
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let scrollPos = calculateScrollPos(cm, rect)
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let startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft
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if (scrollPos.scrollTop != null) {
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updateScrollTop(cm, scrollPos.scrollTop)
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if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true
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}
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if (scrollPos.scrollLeft != null) {
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setScrollLeft(cm, scrollPos.scrollLeft)
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if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true
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}
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if (!changed) break
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}
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return rect
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}
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// Scroll a given set of coordinates into view (immediately).
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export function scrollIntoView(cm, rect) {
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let scrollPos = calculateScrollPos(cm, rect)
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if (scrollPos.scrollTop != null) updateScrollTop(cm, scrollPos.scrollTop)
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if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft)
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}
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// Calculate a new scroll position needed to scroll the given
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// rectangle into view. Returns an object with scrollTop and
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// scrollLeft properties. When these are undefined, the
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// vertical/horizontal position does not need to be adjusted.
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function calculateScrollPos(cm, rect) {
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let display = cm.display, snapMargin = textHeight(cm.display)
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if (rect.top < 0) rect.top = 0
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let screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop
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let screen = displayHeight(cm), result = {}
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if (rect.bottom - rect.top > screen) rect.bottom = rect.top + screen
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let docBottom = cm.doc.height + paddingVert(display)
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let atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin
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if (rect.top < screentop) {
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result.scrollTop = atTop ? 0 : rect.top
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} else if (rect.bottom > screentop + screen) {
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let newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen)
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if (newTop != screentop) result.scrollTop = newTop
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}
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let screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft
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let screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0)
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let tooWide = rect.right - rect.left > screenw
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if (tooWide) rect.right = rect.left + screenw
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if (rect.left < 10)
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result.scrollLeft = 0
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else if (rect.left < screenleft)
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result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10))
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else if (rect.right > screenw + screenleft - 3)
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result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw
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return result
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}
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// Store a relative adjustment to the scroll position in the current
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// operation (to be applied when the operation finishes).
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export function addToScrollTop(cm, top) {
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if (top == null) return
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resolveScrollToPos(cm)
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cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top
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}
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// Make sure that at the end of the operation the current cursor is
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// shown.
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export function ensureCursorVisible(cm) {
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resolveScrollToPos(cm)
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let cur = cm.getCursor()
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cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin}
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}
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export function scrollToCoords(cm, x, y) {
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if (x != null || y != null) resolveScrollToPos(cm)
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if (x != null) cm.curOp.scrollLeft = x
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if (y != null) cm.curOp.scrollTop = y
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}
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export function scrollToRange(cm, range) {
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resolveScrollToPos(cm)
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cm.curOp.scrollToPos = range
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}
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// When an operation has its scrollToPos property set, and another
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// scroll action is applied before the end of the operation, this
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// 'simulates' scrolling that position into view in a cheap way, so
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// that the effect of intermediate scroll commands is not ignored.
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function resolveScrollToPos(cm) {
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let range = cm.curOp.scrollToPos
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if (range) {
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cm.curOp.scrollToPos = null
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let from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to)
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scrollToCoordsRange(cm, from, to, range.margin)
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}
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}
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export function scrollToCoordsRange(cm, from, to, margin) {
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let sPos = calculateScrollPos(cm, {
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left: Math.min(from.left, to.left),
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top: Math.min(from.top, to.top) - margin,
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right: Math.max(from.right, to.right),
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bottom: Math.max(from.bottom, to.bottom) + margin
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})
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scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop)
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}
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// Sync the scrollable area and scrollbars, ensure the viewport
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// covers the visible area.
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export function updateScrollTop(cm, val) {
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if (Math.abs(cm.doc.scrollTop - val) < 2) return
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if (!gecko) updateDisplaySimple(cm, {top: val})
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setScrollTop(cm, val, true)
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if (gecko) updateDisplaySimple(cm)
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startWorker(cm, 100)
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}
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export function setScrollTop(cm, val, forceScroll) {
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val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val)
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if (cm.display.scroller.scrollTop == val && !forceScroll) return
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cm.doc.scrollTop = val
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cm.display.scrollbars.setScrollTop(val)
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if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val
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}
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// Sync scroller and scrollbar, ensure the gutter elements are
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// aligned.
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export function setScrollLeft(cm, val, isScroller, forceScroll) {
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val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth)
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if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) return
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cm.doc.scrollLeft = val
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alignHorizontally(cm)
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if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val
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cm.display.scrollbars.setScrollLeft(val)
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}
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