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font-webapp.coffee
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font-webapp.coffee
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class FontWebapp
constructor: (@options) ->
unless @render?
console.warn "Abstract FontWebapp doesn't do any rendering"
unless @options?
throw new Error "FontWebapp requires options argument"
## Furls initialization
@furls = @options.furls
unless @furls?
@furls = (new (@options.Furls ? Furls))
.addInputs()
.syncState()
.syncClass()
unless @options.root?
throw new Error "FontWebapp requires 'root' option"
## DOM initialization (after Furls in case it wants to add inputs)
@root = findDOM @options.root
@initDOM?()
## Custom initialization
@options.init?.call @
## Automatic resizing
if @resize?
window.addEventListener 'resize', @resize.bind @
@resize()
## First and future renders
if @render?
@furls.on 'stateChange', @furlsCallback = (changed) =>
state = @furls.getState()
if @options.shouldRender? and
not @options.shouldRender.call @, changed, state
@options.afterMaybeRender?.call @, state, changed, false
else
@render state, changed
@render @furls.getState()
render: (state = @furls.getState(), changed) ->
@options.beforeRender?.call @, state
result = @doRender state
@options.afterRender?.call @, state
@options.afterMaybeRender?.call @, state, changed, true
result
@downloadFile: (filename, content, contentType) ->
unless @downloadA?
@downloadA = document.createElement 'a'
@downloadA.id = 'download'
@downloadA.style.display = 'none'
document.body.appendChild @downloadA
@downloadA.href = url = URL.createObjectURL new Blob [content],
type: contentType
@downloadA.download = filename
@downloadA.click() # synchronous
## Allow garbage collection of blob
@downloadA.href = ''
URL.revokeObjectURL url
downloadFile: (filename, content, contentType) ->
@constructor.downloadFile filename, content, contentType
destroy: ->
@furls.off 'stateChange', @furlsCallback if @furlsCallback?
class FontWebappSVG extends FontWebapp
initDOM: ->
SVGJS = @options.SVG ? SVG
if @options.rootSVG?
@svg = SVGJS @options.rootSVG
else
@svg = SVGJS().addTo @root
@renderGroup = @svg.group()
resize: ->
offset = getOffset @root
height = Math.max (@options.minHeight ? 100), window.innerHeight - offset.y
@root.style.height = "#{height}px"
doRender: (state) ->
@renderGroup.clear()
@renderedGlyphs = []
y = 0
xmax = 0
for line, lineNum in state.text.split '\n'
y += (@options.lineKern ? 0) if lineNum > 0
x = 0
dy = 0
if @options.renderLine?
row = @options.renderLine.call @, line, state, @renderGroup
if Array.isArray row
for glyph, c in row
x += @options.charKern unless c == 0 if @options.charKern?
x += glyph.width
dy = Math.max dy, glyph.height
if row.element? # leave y translation for row element
glyph.element?.translate x - (glyph.x ? 0), 0
else
glyph.element?.translate x - (glyph.x ? 0), y - (glyph.y ? 0)
@renderedGlyphs.push glyph
else
@renderedGlyphs.push row
row.element?.translate 0 - (row.x ? 0), y - (row.y ? 0)
x = row.width if row.width?
dy = row.height if row.height?
else
row = []
for char, c in line
if char == ' ' and @options.spaceWidth?
x += @options.spaceWidth
else if (glyph = @options.renderChar.call @, char, state, @renderGroup)?
x += @options.charKern unless c == 0 if @options.charKern?
glyph.element.translate x - (glyph.x ? 0), y - (glyph.y ? 0)
row.push glyph
@renderedGlyphs.push glyph
x += glyph.width
dy = Math.max dy, glyph.height
else
console.warn "Unrecognized character '#{char}'"
xmax = Math.max xmax, x
## Bottom alignment of glyphs on the row
if Array.isArray row
for glyph in row
shiftY = dy - glyph.height
continue unless shiftY
if glyph.shiftY?
glyph.shiftY shiftY
else
glyph.element.transform (translateY: shiftY), true
dy += (@options.blankHeight ? 0) if line == ''
y += dy
margin = @options.margin ? 0
@svg.viewbox
x: -margin
y: -margin
width: xmax + 2*margin
height: y + 2*margin
@renderedGlyphs
destroy: ->
super()
if @options.rootSVG?
@renderGroup.clear().remove()
else
@svg.clear().remove()
downloadSVG: (filename, content = @svg.svg()) ->
@downloadFile filename, content, 'image/svg+xml'
class FontWebappHTML extends FontWebapp
sliderDefaults:
text: 'Character size'
textSize: 12
textGap: 2
thumbBorderColor: '#000'
thumbBorderRadius: 5
thumbBorderWidth: 2
thumbWidth: 15
thumbHeight: 30
thumbShadow: 2
trackBorderColor: '#000'
trackBorderRadius: 2
trackBorderWidth: 1.4
trackHeight: 7
trackColor: '#bbb'
trackFocusColor: '#c8c8c8'
trackShadow: 1
initDOM: ->
@slider = Object.assign {}, @sliderDefaults, @options.slider
@charClass = @options.spaceClass or 'char'
@spaceClass = @options.spaceClass or 'space'
document.head.appendChild (@sizeStyle = document.createElement 'style')
if @options.sizeName? # initialize charWidth according to URL
@charWidth = @furls.getParameterByName? @options.sizeName
@charWidth ?= @options.charWidth ? 100
return @updateSize() unless @options.sizeSlider
@sizeSlider = findDOM @options.sizeSlider
unless (id = @sizeSlider.id)
@sizeSlider.id = id = 'sizeSlider'
@sizeSlider.innerHTML = ''
@sizeSlider.appendChild (text = document.createElement 'span')
text.innerHTML = @slider.text
@sizeSlider.appendChild (@sizeInput = document.createElement 'input')
@sizeInput.type = 'range'
@sizeInput.step = 'any' # allow non-integer offsets from min
@sizeInput.min = @slider.min =
@slider.trackBorderRadius + @slider.thumbWidth / 2
@sizeInput.addEventListener 'input', => @updateSize()
document.head.appendChild (sliderStyle = document.createElement 'style')
## Based on http://danielstern.ca/range.css/ and
## https://github.com/danielstern/range.css/blob/master/app/less/range.less
sliderStyle.innerHTML = """
##{id} {
width: 100%;
position: relative;
}
##{id} > span {
position: absolute;
font-size: #{@slider.textSize}px;
top: #{[email protected] - @slider.textGap +
(@slider.thumbHeight - @slider.trackHeight) / 2}px;
}
@supports (-moz-appearance:none) {
##{id} > span {
}
}
##{id} > input {
width: 100%;
height: #{@slider.thumbHeight}px;
margin: 0;
background-color: transparent;
-webkit-appearance: none;
}
##{id} > input:focus {
outline: none;
}
""" + (
for pseudo in ['-webkit-slider-runnable-track', '-moz-range-track',
'-webkit-slider-thumb', '-moz-range-thumb']
if pseudo.endsWith 'track'
"""
##{id} > input::#{pseudo} {
background: #{@slider.trackColor};
width: 100%;
height: #{@slider.trackHeight}px;
border: #{@slider.trackBorderWidth}px solid #{@slider.trackBorderColor};
border-radius: #{@slider.trackBorderRadius}px;
box-shadow: 0 #{@slider.trackShadow}px #{@slider.trackShadow}px #000;
cursor: pointer;
z-index: 1;
}
##{id} > input:focus::#{pseudo} {
background: #{@slider.trackFocusColor};
}
"""
else #if pseudo.endsWith 'thumb'
"""
##{id} > input::#{pseudo} {
#{if pseudo == '-webkit-slider-thumb'
"""margin-top: #{[email protected] +
@slider.trackHeight / 2 - @slider.thumbHeight / 2}px;"""
else ''}\
-webkit-appearance: none;
width: #{@slider.thumbWidth}px;
height: #{@slider.thumbHeight}px;
background: #841a9b;
border: #{@slider.thumbBorderWidth}px solid #{@slider.thumbBorderColor};
border-radius: #{@slider.thumbBorderRadius}px;
box-shadow: 0 #{@slider.thumbShadow}px #{@slider.thumbShadow}px #000;
cursor: pointer;
}
"""
).join '\n'
## Set input's max value after it's styled to width: 100%.
@sizeResize()
## Set input's value after max value set.
@sizeInput.value = @charWidth
## Set initial character size, which might be smaller if default is above
## max value for this screen width.
@updateSize()
## Update size whenever input resizes. This can happen outside of
## window resize events e.g. because a scrollbar appears/disappears.
if ResizeObserver?
@resizeObserver = new ResizeObserver (entries) =>
for entry in entries when entry.target == @sizeInput
if @sizeResize entry.borderBoxSize.inlineSize
@updateSize()
@resizeObserver.observe @sizeInput
## Furl tracking after value has been set
if @options.sizeName?
@sizeInput.name = @options.sizeName
@furls.addInput @sizeInput,
encode: (value) -> Math.round parseFloat value
minor: true
defaultValue: @charWidth
@furls.on 'inputChange', (input) =>
@updateSize() if input.dom == @sizeInput
resize: ->
## Update input's max value to current screen width.
if @sizeResize()
## In case this clipped input's value, resize.
@updateSize()
sizeResize: (width = @sizeInput?.getBoundingClientRect().width) ->
if width # sizeInput exists and is visible
max = width - @slider.min
else
max = @charWidth # avoid capping desired size
if @sizeInput? and @sizeInput.max != max
@sizeInput?.max = max
updateSize: ->
@charWidth = parseFloat @sizeInput.value if @sizeInput?
scale = @charWidth / @options.charWidth
styles = ["""
.char {
display: inline-block;
box-sizing: border-box;
width: #{@charWidth}px;
}
.char > * { vertical-align: bottom; }
"""]
for pad in ['charPadding', 'charPaddingLeft', 'charPaddingRight',
'charPaddingTop', 'charPaddingBottom']
if @options[pad]
prop = pad
.replace /^charP/, 'p'
.replace /[LR]/, (m) -> "-#{m.toLowerCase()}"
styles.push """
.char { #{prop}: #{@options[pad] * scale}px; }
"""
if @options.charKern
styles.push """
.char { margin-right: #{@options.charKern * scale}px; }
.char:last-child { margin-right: 0 }
"""
if @options.lineKern
styles.push """
.line { margin-bottom: #{@options.lineKern * scale}px; }
"""
if @options.spaceWidth
styles.push """
.space {
display: inline-block;
margin-right: #{@options.spaceWidth * scale}px;
}
"""
styles.push ''
@sizeStyle.innerHTML = styles.join '\n'
doRender: (state) ->
chars = {} if @options.linkIdenticalChars?
@renderedGlyphs = []
@root.innerHTML = '' ## clear previous children
for line in state.text.split '\n'
@root.appendChild (outputLine = document.createElement 'div')
outputLine.className = 'line'
for char, c in line
div = document.createElement 'div'
if char == ' ' and @options.spaceWidth?
div.className = 'space'
outputLine.appendChild div
else if (glyph = @options.renderChar.call @, char, state, div)?
div.className = 'char'
outputLine.appendChild div
@renderedGlyphs.push glyph
if @options.linkIdenticalChars?
chars[char] ?= []
chars[char].push glyph
else
console.warn "Unknown character '#{char}'"
if @options.linkIdenticalChars?
for char, glyphs of chars
@options.linkIdenticalChars glyphs, char
@renderedGlyphs
destroy: ->
super()
@root.innerHTML = ''
@sizeSlider.innerHTML = ''
@resizeObserver?.disconnect()
## Based on https://stackoverflow.com/a/34014786/7797661
getOffset = (el) ->
x = y = 0
while el and not isNaN(el.offsetLeft) and not isNaN(el.offsetTop)
x += el.offsetLeft - el.scrollLeft + el.clientLeft
y += el.offsetTop - el.scrollTop + el.clientTop
el = el.offsetParent
{x, y}
findDOM = (selector) ->
if typeof selector == 'string'
document.querySelector selector
else
selector
exports = {FontWebapp, FontWebappHTML, FontWebappSVG}
module?.exports = exports
window[key] = value for key, value of exports if window?