42 lines
1.5 KiB
CoffeeScript
42 lines
1.5 KiB
CoffeeScript
###
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lib/utils.coffee
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###
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log = (args...) ->
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console.log.apply console, ['markdown-scroll, utils:'].concat args
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module.exports =
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getVisTopHgtBot: ->
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{top: @edtTopBnd, bottom: edtBotBnd} = @editorView.getBoundingClientRect()
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lineEles = @editorView.shadowRoot.querySelectorAll '.lines .line[data-screen-row]'
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lines = []
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for lineEle in lineEles
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{top: lineTopBnd} = lineEle.getBoundingClientRect()
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lines.push [+lineEle.getAttribute('data-screen-row'), lineTopBnd]
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if lines.length is 0
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log 'no visible lines in editor'
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@scrnTopOfs = @scrnBotOfs = @pvwTopB = @previewTopOfs = @previewBotOfs = 0
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return
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lines.sort()
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for refLine in lines
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if refLine[1] >= @edtTopBnd then break
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[refRow, refTopBnd] = refLine
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@scrnTopOfs = (refRow * @chrHgt) - (refTopBnd - @edtTopBnd)
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@scrnHeight = edtBotBnd - @edtTopBnd
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@scrnBotOfs = @scrnTopOfs + @scrnHeight
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botScrnScrollRow = @editor.clipScreenPosition([9e9, 9e9]).row
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@scrnScrollHgt = (botScrnScrollRow + 1) * @chrHgt
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{top: @pvwTopBnd, bottom: pvwBotBnd} = @previewEle.getBoundingClientRect()
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@previewTopOfs = @previewEle.scrollTop
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@previewBotOfs = @previewTopOfs + (pvwBotBnd - @pvwTopBnd)
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getEleTopHgtBot: (ele, scrn = yes) ->
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{top:eleTopBnd, bottom: eleBotBnd} = ele.getBoundingClientRect()
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top = if scrn then @scrnTopOfs + (eleTopBnd - @edtTopBnd) \
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else @previewTopOfs + (eleTopBnd - @pvwTopBnd)
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hgt = eleBotBnd - eleTopBnd
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bot = top + hgt
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[top, hgt, bot]
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