-css = ''
-css += 'body {'
-css += 'margin: 0;'
-css += 'padding: 0;'
-css += '}'
-css += '#wrap1 {'
-css += 'border: 1px solid black;'
-css += "padding: #{overlay_padding}px;"
-css += '}'
-css += '#wrap2 {'
-css += 'border: 1px solid black;'
-css += "padding: #{overlay_padding}px;"
-css += '}'
-css += '#wrap3 {'
-css += 'position: relative;'
-css += '}'
-css += 'iframe {'
-css += 'box-sizing: border-box;'
-css += 'margin: 0;'
-css += 'border: none;'
-css += 'padding: 0;'
-css += "width: #{300 - 4 - 4 * overlay_padding}px;"
-css += "height: #{300 - 4 - 4 * overlay_padding}px;"
-css += '}'
-css += '#overlay {'
-css += 'position: absolute;'
-css += "left: -#{overlay_padding}px;"
-css += "top: -#{overlay_padding}px;"
-css += "right: -#{overlay_padding}px;"
-css += "bottom: -#{overlay_padding}px;"
-css += 'overflow: hidden;'
-css += '}'
-css += '.lightbox {'
-css += 'position: absolute;'
-css += 'background: rgba(100,100,100,0.2);'
-css += '}'
-css += '#cursor {'
-css += 'position: absolute;'
-css += 'height: 1em;'
-css += 'width: 2px;'
-css += 'margin-left: -1px;'
-css += 'margin-right: -1px;'
-css += 'background: #444;'
-css += '-webkit-animation: blink 1s steps(2, start) infinite;'
-css += 'animation: blink 1s steps(2, start) infinite;'
-css += '}'
-css += '@-webkit-keyframes blink {'
-css += 'to { visibility: hidden; }'
-css += '}'
-css += '@keyframes blink {'
-css += 'to { visibility: hidden; }'
-css += '}'
+outer_css = (args) ->
+ w = args.w ? 300
+ h = args.h ? 300
+ inner_padding = args.inner_padding ? overlay_padding
+ frame_width = args.frame_width ? inner_padding
+ # TODO editor controls height...
+ occupy = (left, top = left, right = left, bottom = top) ->
+ w -= left + right
+ h -= top + bottom
+ return Math.max(left, top, right, bottom)
+ ret = ''
+ ret += 'body {'
+ ret += 'margin: 0;'
+ ret += 'padding: 0;'
+ ret += '}'
+ ret += '#wrap1 {'
+ ret += "border: #{occupy 1}px solid black;"
+ ret += "padding: #{occupy frame_width}px;"
+ ret += '}'
+ ret += '#wrap2 {'
+ ret += "border: #{occupy 1}px solid black;"
+ ret += "padding: #{occupy inner_padding}px;"
+ ret += "padding-right: #{inner_padding + occupy 0, 0, 15, 0}px;" # for scroll bar
+ ret += "width: #{w}px;"
+ ret += "height: #{h}px;"
+ ret += 'overflow-x: hidden;'
+ ret += 'overflow-y: scroll;'
+ ret += '}'
+ ret += '#wrap3 {'
+ ret += 'position: relative;'
+ ret += "width: #{w}px;"
+ ret += "min-height: #{h}px;"
+ ret += '}'
+ ret += 'iframe {'
+ ret += 'box-sizing: border-box;'
+ ret += 'margin: 0;'
+ ret += 'border: none;'
+ ret += 'padding: 0;'
+ ret += "width: #{w}px;"
+ #ret += "height: #{h}px;" # height auto-set when content set/changed
+ ret += '}'
+ ret += '#overlay {'
+ ret += 'position: absolute;'
+ ret += "left: -#{inner_padding}px;"
+ ret += "top: -#{inner_padding}px;"
+ ret += "right: -#{inner_padding}px;"
+ ret += "bottom: -#{inner_padding}px;"
+ ret += 'overflow: hidden;'
+ ret += '}'
+ ret += '.lightbox {'
+ ret += 'position: absolute;'
+ ret += 'background: rgba(100,100,100,0.2);'
+ ret += '}'
+ ret += '#cursor {'
+ ret += 'position: absolute;'
+ ret += 'height: 1em;' # FIXME adjust for hight of text
+ ret += 'width: 2px;'
+ ret += 'background: #444;'
+ ret += '-webkit-animation: blink 1s steps(2, start) infinite;'
+ ret += 'animation: blink 1s steps(2, start) infinite;'
+ ret += '}'
+ ret += '@-webkit-keyframes blink {'
+ ret += 'to { visibility: hidden; }'
+ ret += '}'
+ ret += '@keyframes blink {'
+ ret += 'to { visibility: hidden; }'
+ ret += '}'
+ return ret