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import { addClass, elt, rmClass } from "../util/dom.js"
import { on } from "../util/event.js"
import { scrollGap, paddingVert } from "../measurement/position_measurement.js"
import { ie, ie_version, mac, mac_geMountainLion } from "../util/browser.js"
import { updateHeightsInViewport } from "./update_lines.js"
import { Delayed } from "../util/misc.js"
import { setScrollLeft, updateScrollTop } from "./scrolling.js"
// SCROLLBARS
// Prepare DOM reads needed to update the scrollbars. Done in one
// shot to minimize update/measure roundtrips.
export function measureForScrollbars(cm) {
let d = cm.display, gutterW = d.gutters.offsetWidth
let docH = Math.round(cm.doc.height + paddingVert(cm.display))
return {
clientHeight: d.scroller.clientHeight,
viewHeight: d.wrapper.clientHeight,
scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
viewWidth: d.wrapper.clientWidth,
barLeft: cm.options.fixedGutter ? gutterW : 0,
docHeight: docH,
scrollHeight: docH + scrollGap(cm) + d.barHeight,
nativeBarWidth: d.nativeBarWidth,
gutterWidth: gutterW
}
}
class NativeScrollbars {
constructor(place, scroll, cm) {
this.cm = cm
let vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar")
let horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar")
vert.tabIndex = horiz.tabIndex = -1
place(vert); place(horiz)
on(vert, "scroll", () => {
if (vert.clientHeight) scroll(vert.scrollTop, "vertical")
})
on(horiz, "scroll", () => {
if (horiz.clientWidth) scroll(horiz.scrollLeft, "horizontal")
})
this.checkedZeroWidth = false
// Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
if (ie && ie_version < 8) this.horiz.style.minHeight = this.vert.style.minWidth = "18px"
}
update(measure) {
let needsH = measure.scrollWidth > measure.clientWidth + 1
let needsV = measure.scrollHeight > measure.clientHeight + 1
let sWidth = measure.nativeBarWidth
if (needsV) {
this.vert.style.display = "block"
this.vert.style.bottom = needsH ? sWidth + "px" : "0"
let totalHeight = measure.viewHeight - (needsH ? sWidth : 0)
// A bug in IE8 can cause this value to be negative, so guard it.
this.vert.firstChild.style.height =
Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px"
} else {
this.vert.scrollTop = 0
this.vert.style.display = ""
this.vert.firstChild.style.height = "0"
}
if (needsH) {
this.horiz.style.display = "block"
this.horiz.style.right = needsV ? sWidth + "px" : "0"
this.horiz.style.left = measure.barLeft + "px"
let totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0)
this.horiz.firstChild.style.width =
Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px"
} else {
this.horiz.style.display = ""
this.horiz.firstChild.style.width = "0"
}
if (!this.checkedZeroWidth && measure.clientHeight > 0) {
if (sWidth == 0) this.zeroWidthHack()
this.checkedZeroWidth = true
}
return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
}
setScrollLeft(pos) {
if (this.horiz.scrollLeft != pos) this.horiz.scrollLeft = pos
if (this.disableHoriz) this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz")
}
setScrollTop(pos) {
if (this.vert.scrollTop != pos) this.vert.scrollTop = pos
if (this.disableVert) this.enableZeroWidthBar(this.vert, this.disableVert, "vert")
}
zeroWidthHack() {
let w = mac && !mac_geMountainLion ? "12px" : "18px"
this.horiz.style.height = this.vert.style.width = w
this.horiz.style.visibility = this.vert.style.visibility = "hidden"
this.disableHoriz = new Delayed
this.disableVert = new Delayed
}
enableZeroWidthBar(bar, delay, type) {
bar.style.visibility = ""
function maybeDisable() {
// To find out whether the scrollbar is still visible, we
// check whether the element under the pixel in the bottom
// right corner of the scrollbar box is the scrollbar box
// itself (when the bar is still visible) or its filler child
// (when the bar is hidden). If it is still visible, we keep
// it enabled, if it's hidden, we disable pointer events.
let box = bar.getBoundingClientRect()
let elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
: document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1)
if (elt != bar) bar.style.visibility = "hidden"
else delay.set(1000, maybeDisable)
}
delay.set(1000, maybeDisable)
}
clear() {
let parent = this.horiz.parentNode
parent.removeChild(this.horiz)
parent.removeChild(this.vert)
}
}
class NullScrollbars {
update() { return {bottom: 0, right: 0} }
setScrollLeft() {}
setScrollTop() {}
clear() {}
}
export function updateScrollbars(cm, measure) {
if (!measure) measure = measureForScrollbars(cm)
let startWidth = cm.display.barWidth, startHeight = cm.display.barHeight
updateScrollbarsInner(cm, measure)
for (let i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
updateHeightsInViewport(cm)
updateScrollbarsInner(cm, measureForScrollbars(cm))
startWidth = cm.display.barWidth; startHeight = cm.display.barHeight
}
}
// Re-synchronize the fake scrollbars with the actual size of the
// content.
function updateScrollbarsInner(cm, measure) {
let d = cm.display
let sizes = d.scrollbars.update(measure)
d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px"
d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px"
d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent"
if (sizes.right && sizes.bottom) {
d.scrollbarFiller.style.display = "block"
d.scrollbarFiller.style.height = sizes.bottom + "px"
d.scrollbarFiller.style.width = sizes.right + "px"
} else d.scrollbarFiller.style.display = ""
if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
d.gutterFiller.style.display = "block"
d.gutterFiller.style.height = sizes.bottom + "px"
d.gutterFiller.style.width = measure.gutterWidth + "px"
} else d.gutterFiller.style.display = ""
}
export let scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars}
export function initScrollbars(cm) {
if (cm.display.scrollbars) {
cm.display.scrollbars.clear()
if (cm.display.scrollbars.addClass)
rmClass(cm.display.wrapper, cm.display.scrollbars.addClass)
}
cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](node => {
cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller)
// Prevent clicks in the scrollbars from killing focus
on(node, "mousedown", () => {
if (cm.state.focused) setTimeout(() => cm.display.input.focus(), 0)
})
node.setAttribute("cm-not-content", "true")
}, (pos, axis) => {
if (axis == "horizontal") setScrollLeft(cm, pos)
else updateScrollTop(cm, pos)
}, cm)
if (cm.display.scrollbars.addClass)
addClass(cm.display.wrapper, cm.display.scrollbars.addClass)
}