|
0
|
1 import { heightAtLine } from "../line/spans.js"
|
|
|
2 import { getLine, lineAtHeight, updateLineHeight } from "../line/utils_line.js"
|
|
|
3 import { paddingTop, charWidth } from "../measurement/position_measurement.js"
|
|
|
4 import { ie, ie_version } from "../util/browser.js"
|
|
|
5
|
|
|
6 // Read the actual heights of the rendered lines, and update their
|
|
|
7 // stored heights to match.
|
|
|
8 export function updateHeightsInViewport(cm) {
|
|
|
9 let display = cm.display
|
|
|
10 let prevBottom = display.lineDiv.offsetTop
|
|
|
11 let viewTop = Math.max(0, display.scroller.getBoundingClientRect().top)
|
|
|
12 let oldHeight = display.lineDiv.getBoundingClientRect().top
|
|
|
13 let mustScroll = 0
|
|
|
14 for (let i = 0; i < display.view.length; i++) {
|
|
|
15 let cur = display.view[i], wrapping = cm.options.lineWrapping
|
|
|
16 let height, width = 0
|
|
|
17 if (cur.hidden) continue
|
|
|
18 oldHeight += cur.line.height
|
|
|
19 if (ie && ie_version < 8) {
|
|
|
20 let bot = cur.node.offsetTop + cur.node.offsetHeight
|
|
|
21 height = bot - prevBottom
|
|
|
22 prevBottom = bot
|
|
|
23 } else {
|
|
|
24 let box = cur.node.getBoundingClientRect()
|
|
|
25 height = box.bottom - box.top
|
|
|
26 // Check that lines don't extend past the right of the current
|
|
|
27 // editor width
|
|
|
28 if (!wrapping && cur.text.firstChild)
|
|
|
29 width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1
|
|
|
30 }
|
|
|
31 let diff = cur.line.height - height
|
|
|
32 if (diff > .005 || diff < -.005) {
|
|
|
33 if (oldHeight < viewTop) mustScroll -= diff
|
|
|
34 updateLineHeight(cur.line, height)
|
|
|
35 updateWidgetHeight(cur.line)
|
|
|
36 if (cur.rest) for (let j = 0; j < cur.rest.length; j++)
|
|
|
37 updateWidgetHeight(cur.rest[j])
|
|
|
38 }
|
|
|
39 if (width > cm.display.sizerWidth) {
|
|
|
40 let chWidth = Math.ceil(width / charWidth(cm.display))
|
|
|
41 if (chWidth > cm.display.maxLineLength) {
|
|
|
42 cm.display.maxLineLength = chWidth
|
|
|
43 cm.display.maxLine = cur.line
|
|
|
44 cm.display.maxLineChanged = true
|
|
|
45 }
|
|
|
46 }
|
|
|
47 }
|
|
|
48 if (Math.abs(mustScroll) > 2) display.scroller.scrollTop += mustScroll
|
|
|
49 }
|
|
|
50
|
|
|
51 // Read and store the height of line widgets associated with the
|
|
|
52 // given line.
|
|
|
53 function updateWidgetHeight(line) {
|
|
|
54 if (line.widgets) for (let i = 0; i < line.widgets.length; ++i) {
|
|
|
55 let w = line.widgets[i], parent = w.node.parentNode
|
|
|
56 if (parent) w.height = parent.offsetHeight
|
|
|
57 }
|
|
|
58 }
|
|
|
59
|
|
|
60 // Compute the lines that are visible in a given viewport (defaults
|
|
|
61 // the current scroll position). viewport may contain top,
|
|
|
62 // height, and ensure (see op.scrollToPos) properties.
|
|
|
63 export function visibleLines(display, doc, viewport) {
|
|
|
64 let top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop
|
|
|
65 top = Math.floor(top - paddingTop(display))
|
|
|
66 let bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight
|
|
|
67
|
|
|
68 let from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom)
|
|
|
69 // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
|
|
|
70 // forces those lines into the viewport (if possible).
|
|
|
71 if (viewport && viewport.ensure) {
|
|
|
72 let ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line
|
|
|
73 if (ensureFrom < from) {
|
|
|
74 from = ensureFrom
|
|
|
75 to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight)
|
|
|
76 } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
|
|
|
77 from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight)
|
|
|
78 to = ensureTo
|
|
|
79 }
|
|
|
80 }
|
|
|
81 return {from: from, to: Math.max(to, from + 1)}
|
|
|
82 }
|
