import { buildLineContent, LineView } from "../line/line_data.js"
import { clipPos, Pos } from "../line/pos.js"
import { collapsedSpanAround, heightAtLine, lineIsHidden, visualLine } from "../line/spans.js"
import { getLine, lineAtHeight, lineNo, updateLineHeight } from "../line/utils_line.js"
import { bidiOther, getBidiPartAt, getOrder } from "../util/bidi.js"
import { chrome, android, ie, ie_version } from "../util/browser.js"
import { elt, removeChildren, range, removeChildrenAndAdd, doc } from "../util/dom.js"
import { e_target } from "../util/event.js"
import { hasBadZoomedRects } from "../util/feature_detection.js"
import { countColumn, findFirst, isExtendingChar, scrollerGap, skipExtendingChars } from "../util/misc.js"
import { updateLineForChanges } from "../display/update_line.js"
import { widgetHeight } from "./widgets.js"
// POSITION MEASUREMENT
export function paddingTop(display) {return display.lineSpace.offsetTop}
export function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
export function paddingH(display) {
if (display.cachedPaddingH) return display.cachedPaddingH
let e = removeChildrenAndAdd(display.measure, elt("pre", "x", "CodeMirror-line-like"))
let style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle
let data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)}
if (!isNaN(data.left) && !isNaN(data.right)) display.cachedPaddingH = data
return data
}
export function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
export function displayWidth(cm) {
return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
}
export function displayHeight(cm) {
return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
}
// Ensure the lineView.wrapping.heights array is populated. This is
// an array of bottom offsets for the lines that make up a drawn
// line. When lineWrapping is on, there might be more than one
// height.
function ensureLineHeights(cm, lineView, rect) {
let wrapping = cm.options.lineWrapping
let curWidth = wrapping && displayWidth(cm)
if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
let heights = lineView.measure.heights = []
if (wrapping) {
lineView.measure.width = curWidth
let rects = lineView.text.firstChild.getClientRects()
for (let i = 0; i < rects.length - 1; i++) {
let cur = rects[i], next = rects[i + 1]
if (Math.abs(cur.bottom - next.bottom) > 2)
heights.push((cur.bottom + next.top) / 2 - rect.top)
}
}
heights.push(rect.bottom - rect.top)
}
}
// Find a line map (mapping character offsets to text nodes) and a
// measurement cache for the given line number. (A line view might
// contain multiple lines when collapsed ranges are present.)
export function mapFromLineView(lineView, line, lineN) {
if (lineView.line == line)
return {map: lineView.measure.map, cache: lineView.measure.cache}
if (lineView.rest) {
for (let i = 0; i < lineView.rest.length; i++)
if (lineView.rest[i] == line)
return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]}
for (let i = 0; i < lineView.rest.length; i++)
if (lineNo(lineView.rest[i]) > lineN)
return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i], before: true}
}
}
// Render a line into the hidden node display.externalMeasured. Used
// when measurement is needed for a line that's not in the viewport.
function updateExternalMeasurement(cm, line) {
line = visualLine(line)
let lineN = lineNo(line)
let view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN)
view.lineN = lineN
let built = view.built = buildLineContent(cm, view)
view.text = built.pre
removeChildrenAndAdd(cm.display.lineMeasure, built.pre)
return view
}
// Get a {top, bottom, left, right} box (in line-local coordinates)
// for a given character.
export function measureChar(cm, line, ch, bias) {
return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
}
// Find a line view that corresponds to the given line number.
export function findViewForLine(cm, lineN) {
if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
return cm.display.view[findViewIndex(cm, lineN)]
let ext = cm.display.externalMeasured
if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
return ext
}
// Measurement can be split in two steps, the set-up work that
// applies to the whole line, and the measurement of the actual
// character. Functions like coordsChar, that need to do a lot of
// measurements in a row, can thus ensure that the set-up work is
// only done once.
export function prepareMeasureForLine(cm, line) {
let lineN = lineNo(line)
let view = findViewForLine(cm, lineN)
if (view && !view.text) {
view = null
} else if (view && view.changes) {
updateLineForChanges(cm, view, lineN, getDimensions(cm))
cm.curOp.forceUpdate = true
}
if (!view)
view = updateExternalMeasurement(cm, line)
let info = mapFromLineView(view, line, lineN)
return {
line: line, view: view, rect: null,
map: info.map, cache: info.cache, before: info.before,
hasHeights: false
}
}
// Given a prepared measurement object, measures the position of an
// actual character (or fetches it from the cache).
export function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
if (prepared.before) ch = -1
let key = ch + (bias || ""), found
if (prepared.cache.hasOwnProperty(key)) {
found = prepared.cache[key]
} else {
if (!prepared.rect)
prepared.rect = prepared.view.text.getBoundingClientRect()
if (!prepared.hasHeights) {
ensureLineHeights(cm, prepared.view, prepared.rect)
prepared.hasHeights = true
}
found = measureCharInner(cm, prepared, ch, bias)
if (!found.bogus) prepared.cache[key] = found
}
return {left: found.left, right: found.right,
top: varHeight ? found.rtop : found.top,
bottom: varHeight ? found.rbottom : found.bottom}
}
let nullRect = {left: 0, right: 0, top: 0, bottom: 0}
export function nodeAndOffsetInLineMap(map, ch, bias) {
let node, start, end, collapse, mStart, mEnd
// First, search the line map for the text node corresponding to,
// or closest to, the target character.
for (let i = 0; i < map.length; i += 3) {
mStart = map[i]
mEnd = map[i + 1]
if (ch < mStart) {
start = 0; end = 1
collapse = "left"
} else if (ch < mEnd) {
start = ch - mStart
end = start + 1
} else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
end = mEnd - mStart
start = end - 1
if (ch >= mEnd) collapse = "right"
}
if (start != null) {
node = map[i + 2]
if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
collapse = bias
if (bias == "left" && start == 0)
while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
node = map[(i -= 3) + 2]
collapse = "left"
}
if (bias == "right" && start == mEnd - mStart)
while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
node = map[(i += 3) + 2]
collapse = "right"
}
break
}
}
return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
}
function getUsefulRect(rects, bias) {
let rect = nullRect
if (bias == "left") for (let i = 0; i < rects.length; i++) {
if ((rect = rects[i]).left != rect.right) break
} else for (let i = rects.length - 1; i >= 0; i--) {
if ((rect = rects[i]).left != rect.right) break
}
return rect
}
function measureCharInner(cm, prepared, ch, bias) {
let place = nodeAndOffsetInLineMap(prepared.map, ch, bias)
let node = place.node, start = place.start, end = place.end, collapse = place.collapse
let rect
if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
for (let i = 0; i < 4; i++) { // Retry a maximum of 4 times when nonsense rectangles are returned
while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) --start
while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) ++end
if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
rect = node.parentNode.getBoundingClientRect()
else
rect = getUsefulRect(range(node, start, end).getClientRects(), bias)
if (rect.left || rect.right || start == 0) break
end = start
start = start - 1
collapse = "right"
}
if (ie && ie_version < 11) rect = maybeUpdateRectForZooming(cm.display.measure, rect)
} else { // If it is a widget, simply get the box for the whole widget.
if (start > 0) collapse = bias = "right"
let rects
if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
rect = rects[bias == "right" ? rects.length - 1 : 0]
else
rect = node.getBoundingClientRect()
}
if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
let rSpan = node.parentNode.getClientRects()[0]
if (rSpan)
rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}
else
rect = nullRect
}
let rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top
let mid = (rtop + rbot) / 2
let heights = prepared.view.measure.heights
let i = 0
for (; i < heights.length - 1; i++)
if (mid < heights[i]) break
let top = i ? heights[i - 1] : 0, bot = heights[i]
let result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
top: top, bottom: bot}
if (!rect.left && !rect.right) result.bogus = true
if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot }
return result
}
// Work around problem with bounding client rects on ranges being
// returned incorrectly when zoomed on IE10 and below.
function maybeUpdateRectForZooming(measure, rect) {
if (!window.screen || screen.logicalXDPI == null ||
screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
return rect
let scaleX = screen.logicalXDPI / screen.deviceXDPI
let scaleY = screen.logicalYDPI / screen.deviceYDPI
return {left: rect.left * scaleX, right: rect.right * scaleX,
top: rect.top * scaleY, bottom: rect.bottom * scaleY}
}
export function clearLineMeasurementCacheFor(lineView) {
if (lineView.measure) {
lineView.measure.cache = {}
lineView.measure.heights = null
if (lineView.rest) for (let i = 0; i < lineView.rest.length; i++)
lineView.measure.caches[i] = {}
}
}
export function clearLineMeasurementCache(cm) {
cm.display.externalMeasure = null
removeChildren(cm.display.lineMeasure)
for (let i = 0; i < cm.display.view.length; i++)
clearLineMeasurementCacheFor(cm.display.view[i])
}
export function clearCaches(cm) {
clearLineMeasurementCache(cm)
cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null
if (!cm.options.lineWrapping) cm.display.maxLineChanged = true
cm.display.lineNumChars = null
}
function pageScrollX(doc) {
// Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
// which causes page_Offset and bounding client rects to use
// different reference viewports and invalidate our calculations.
if (chrome && android) return -(doc.body.getBoundingClientRect().left - parseInt(getComputedStyle(doc.body).marginLeft))
return doc.defaultView.pageXOffset || (doc.documentElement || doc.body).scrollLeft
}
function pageScrollY(doc) {
if (chrome && android) return -(doc.body.getBoundingClientRect().top - parseInt(getComputedStyle(doc.body).marginTop))
return doc.defaultView.pageYOffset || (doc.documentElement || doc.body).scrollTop
}
function widgetTopHeight(lineObj) {
let {widgets} = visualLine(lineObj), height = 0
if (widgets) for (let i = 0; i < widgets.length; ++i) if (widgets[i].above)
height += widgetHeight(widgets[i])
return height
}
// Converts a {top, bottom, left, right} box from line-local
// coordinates into another coordinate system. Context may be one of
// "line", "div" (display.lineDiv), "local"./null (editor), "window",
// or "page".
export function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
if (!includeWidgets) {
let height = widgetTopHeight(lineObj)
rect.top += height; rect.bottom += height
}
if (context == "line") return rect
if (!context) context = "local"
let yOff = heightAtLine(lineObj)
if (context == "local") yOff += paddingTop(cm.display)
else yOff -= cm.display.viewOffset
if (context == "page" || context == "window") {
let lOff = cm.display.lineSpace.getBoundingClientRect()
yOff += lOff.top + (context == "window" ? 0 : pageScrollY(doc(cm)))
let xOff = lOff.left + (context == "window" ? 0 : pageScrollX(doc(cm)))
rect.left += xOff; rect.right += xOff
}
rect.top += yOff; rect.bottom += yOff
return rect
}
// Coverts a box from "div" coords to another coordinate system.
// Context may be "window", "page", "div", or "local"./null.
export function fromCoordSystem(cm, coords, context) {
if (context == "div") return coords
let left = coords.left, top = coords.top
// First move into "page" coordinate system
if (context == "page") {
left -= pageScrollX(doc(cm))
top -= pageScrollY(doc(cm))
} else if (context == "local" || !context) {
let localBox = cm.display.sizer.getBoundingClientRect()
left += localBox.left
top += localBox.top
}
let lineSpaceBox = cm.display.lineSpace.getBoundingClientRect()
return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
}
export function charCoords(cm, pos, context, lineObj, bias) {
if (!lineObj) lineObj = getLine(cm.doc, pos.line)
return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
}
// Returns a box for a given cursor position, which may have an
// 'other' property containing the position of the secondary cursor
// on a bidi boundary.
// A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
// and after `char - 1` in writing order of `char - 1`
// A cursor Pos(line, char, "after") is on the same visual line as `char`
// and before `char` in writing order of `char`
// Examples (upper-case letters are RTL, lower-case are LTR):
// Pos(0, 1, ...)
// before after
// ab a|b a|b
// aB a|B aB|
// Ab |Ab A|b
// AB B|A B|A
// Every position after the last character on a line is considered to stick
// to the last character on the line.
export function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
lineObj = lineObj || getLine(cm.doc, pos.line)
if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj)
function get(ch, right) {
let m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight)
if (right) m.left = m.right; else m.right = m.left
return intoCoordSystem(cm, lineObj, m, context)
}
let order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky
if (ch >= lineObj.text.length) {
ch = lineObj.text.length
sticky = "before"
} else if (ch <= 0) {
ch = 0
sticky = "after"
}
if (!order) return get(sticky == "before" ? ch - 1 : ch, sticky == "before")
function getBidi(ch, partPos, invert) {
let part = order[partPos], right = part.level == 1
return get(invert ? ch - 1 : ch, right != invert)
}
let partPos = getBidiPartAt(order, ch, sticky)
let other = bidiOther
let val = getBidi(ch, partPos, sticky == "before")
if (other != null) val.other = getBidi(ch, other, sticky != "before")
return val
}
// Used to cheaply estimate the coordinates for a position. Used for
// intermediate scroll updates.
export function estimateCoords(cm, pos) {
let left = 0
pos = clipPos(cm.doc, pos)
if (!cm.options.lineWrapping) left = charWidth(cm.display) * pos.ch
let lineObj = getLine(cm.doc, pos.line)
let top = heightAtLine(lineObj) + paddingTop(cm.display)
return {left: left, right: left, top: top, bottom: top + lineObj.height}
}
// Positions returned by coordsChar contain some extra information.
// xRel is the relative x position of the input coordinates compared
// to the found position (so xRel > 0 means the coordinates are to
// the right of the character position, for example). When outside
// is true, that means the coordinates lie outside the line's
// vertical range.
function PosWithInfo(line, ch, sticky, outside, xRel) {
let pos = Pos(line, ch, sticky)
pos.xRel = xRel
if (outside) pos.outside = outside
return pos
}
// Compute the character position closest to the given coordinates.
// Input must be lineSpace-local ("div" coordinate system).
export function coordsChar(cm, x, y) {
let doc = cm.doc
y += cm.display.viewOffset
if (y < 0) return PosWithInfo(doc.first, 0, null, -1, -1)
let lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1
if (lineN > last)
return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1)
if (x < 0) x = 0
let lineObj = getLine(doc, lineN)
for (;;) {
let found = coordsCharInner(cm, lineObj, lineN, x, y)
let collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0))
if (!collapsed) return found
let rangeEnd = collapsed.find(1)
if (rangeEnd.line == lineN) return rangeEnd
lineObj = getLine(doc, lineN = rangeEnd.line)
}
}
function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
y -= widgetTopHeight(lineObj)
let end = lineObj.text.length
let begin = findFirst(ch => measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y, end, 0)
end = findFirst(ch => measureCharPrepared(cm, preparedMeasure, ch).top > y, begin, end)
return {begin, end}
}
export function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj)
let targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top
return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
}
// Returns true if the given side of a box is after the given
// coordinates, in top-to-bottom, left-to-right order.
function boxIsAfter(box, x, y, left) {
return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
}
function coordsCharInner(cm, lineObj, lineNo, x, y) {
// Move y into line-local coordinate space
y -= heightAtLine(lineObj)
let preparedMeasure = prepareMeasureForLine(cm, lineObj)
// When directly calling `measureCharPrepared`, we have to adjust
// for the widgets at this line.
let widgetHeight = widgetTopHeight(lineObj)
let begin = 0, end = lineObj.text.length, ltr = true
let order = getOrder(lineObj, cm.doc.direction)
// If the line isn't plain left-to-right text, first figure out
// which bidi section the coordinates fall into.
if (order) {
let part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
(cm, lineObj, lineNo, preparedMeasure, order, x, y)
ltr = part.level != 1
// The awkward -1 offsets are needed because findFirst (called
// on these below) will treat its first bound as inclusive,
// second as exclusive, but we want to actually address the
// characters in the part's range
begin = ltr ? part.from : part.to - 1
end = ltr ? part.to : part.from - 1
}
// A binary search to find the first character whose bounding box
// starts after the coordinates. If we run across any whose box wrap
// the coordinates, store that.
let chAround = null, boxAround = null
let ch = findFirst(ch => {
let box = measureCharPrepared(cm, preparedMeasure, ch)
box.top += widgetHeight; box.bottom += widgetHeight
if (!boxIsAfter(box, x, y, false)) return false
if (box.top <= y && box.left <= x) {
chAround = ch
boxAround = box
}
return true
}, begin, end)
let baseX, sticky, outside = false
// If a box around the coordinates was found, use that
if (boxAround) {
// Distinguish coordinates nearer to the left or right side of the box
let atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr
ch = chAround + (atStart ? 0 : 1)
sticky = atStart ? "after" : "before"
baseX = atLeft ? boxAround.left : boxAround.right
} else {
// (Adjust for extended bound, if necessary.)
if (!ltr && (ch == end || ch == begin)) ch++
// To determine which side to associate with, get the box to the
// left of the character and compare it's vertical position to the
// coordinates
sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
(measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
"after" : "before"
// Now get accurate coordinates for this place, in order to get a
// base X position
let coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure)
baseX = coords.left
outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0
}
ch = skipExtendingChars(lineObj.text, ch, 1)
return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
}
function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
// Bidi parts are sorted left-to-right, and in a non-line-wrapping
// situation, we can take this ordering to correspond to the visual
// ordering. This finds the first part whose end is after the given
// coordinates.
let index = findFirst(i => {
let part = order[i], ltr = part.level != 1
return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
"line", lineObj, preparedMeasure), x, y, true)
}, 0, order.length - 1)
let part = order[index]
// If this isn't the first part, the part's start is also after
// the coordinates, and the coordinates aren't on the same line as
// that start, move one part back.
if (index > 0) {
let ltr = part.level != 1
let start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
"line", lineObj, preparedMeasure)
if (boxIsAfter(start, x, y, true) && start.top > y)
part = order[index - 1]
}
return part
}
function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
// In a wrapped line, rtl text on wrapping boundaries can do things
// that don't correspond to the ordering in our `order` array at
// all, so a binary search doesn't work, and we want to return a
// part that only spans one line so that the binary search in
// coordsCharInner is safe. As such, we first find the extent of the
// wrapped line, and then do a flat search in which we discard any
// spans that aren't on the line.
let {begin, end} = wrappedLineExtent(cm, lineObj, preparedMeasure, y)
if (/\s/.test(lineObj.text.charAt(end - 1))) end--
let part = null, closestDist = null
for (let i = 0; i < order.length; i++) {
let p = order[i]
if (p.from >= end || p.to <= begin) continue
let ltr = p.level != 1
let endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right
// Weigh against spans ending before this, so that they are only
// picked if nothing ends after
let dist = endX < x ? x - endX + 1e9 : endX - x
if (!part || closestDist > dist) {
part = p
closestDist = dist
}
}
if (!part) part = order[order.length - 1]
// Clip the part to the wrapped line.
if (part.from < begin) part = {from: begin, to: part.to, level: part.level}
if (part.to > end) part = {from: part.from, to: end, level: part.level}
return part
}
let measureText
// Compute the default text height.
export function textHeight(display) {
if (display.cachedTextHeight != null) return display.cachedTextHeight
if (measureText == null) {
measureText = elt("pre", null, "CodeMirror-line-like")
// Measure a bunch of lines, for browsers that compute
// fractional heights.
for (let i = 0; i < 49; ++i) {
measureText.appendChild(document.createTextNode("x"))
measureText.appendChild(elt("br"))
}
measureText.appendChild(document.createTextNode("x"))
}
removeChildrenAndAdd(display.measure, measureText)
let height = measureText.offsetHeight / 50
if (height > 3) display.cachedTextHeight = height
removeChildren(display.measure)
return height || 1
}
// Compute the default character width.
export function charWidth(display) {
if (display.cachedCharWidth != null) return display.cachedCharWidth
let anchor = elt("span", "xxxxxxxxxx")
let pre = elt("pre", [anchor], "CodeMirror-line-like")
removeChildrenAndAdd(display.measure, pre)
let rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10
if (width > 2) display.cachedCharWidth = width
return width || 10
}
// Do a bulk-read of the DOM positions and sizes needed to draw the
// view, so that we don't interleave reading and writing to the DOM.
export function getDimensions(cm) {
let d = cm.display, left = {}, width = {}
let gutterLeft = d.gutters.clientLeft
for (let n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
let id = cm.display.gutterSpecs[i].className
left[id] = n.offsetLeft + n.clientLeft + gutterLeft
width[id] = n.clientWidth
}
return {fixedPos: compensateForHScroll(d),
gutterTotalWidth: d.gutters.offsetWidth,
gutterLeft: left,
gutterWidth: width,
wrapperWidth: d.wrapper.clientWidth}
}
// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
// but using getBoundingClientRect to get a sub-pixel-accurate
// result.
export function compensateForHScroll(display) {
return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
}
// Returns a function that estimates the height of a line, to use as
// first approximation until the line becomes visible (and is thus
// properly measurable).
export function estimateHeight(cm) {
let th = textHeight(cm.display), wrapping = cm.options.lineWrapping
let perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3)
return line => {
if (lineIsHidden(cm.doc, line)) return 0
let widgetsHeight = 0
if (line.widgets) for (let i = 0; i < line.widgets.length; i++) {
if (line.widgets[i].height) widgetsHeight += line.widgets[i].height
}
if (wrapping)
return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th
else
return widgetsHeight + th
}
}
export function estimateLineHeights(cm) {
let doc = cm.doc, est = estimateHeight(cm)
doc.iter(line => {
let estHeight = est(line)
if (estHeight != line.height) updateLineHeight(line, estHeight)
})
}
// Given a mouse event, find the corresponding position. If liberal
// is false, it checks whether a gutter or scrollbar was clicked,
// and returns null if it was. forRect is used by rectangular
// selections, and tries to estimate a character position even for
// coordinates beyond the right of the text.
export function posFromMouse(cm, e, liberal, forRect) {
let display = cm.display
if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") return null
let x, y, space = display.lineSpace.getBoundingClientRect()
// Fails unpredictably on IE[67] when mouse is dragged around quickly.
try { x = e.clientX - space.left; y = e.clientY - space.top }
catch (e) { return null }
let coords = coordsChar(cm, x, y), line
if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
let colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length
coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff))
}
return coords
}
// Find the view element corresponding to a given line. Return null
// when the line isn't visible.
export function findViewIndex(cm, n) {
if (n >= cm.display.viewTo) return null
n -= cm.display.viewFrom
if (n < 0) return null
let view = cm.display.view
for (let i = 0; i < view.length; i++) {
n -= view[i].size
if (n < 0) return i
}
}
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