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scroll cursor into view when it moves
authorJason Woofenden <jason@jasonwoof.com>
Thu, 24 Mar 2016 02:03:30 +0000 (22:03 -0400)
committerJason Woofenden <jason@jasonwoof.com>
Thu, 24 Mar 2016 02:05:44 +0000 (22:05 -0400)
editor.coffee

index 012079c..73d863e 100644 (file)
@@ -235,99 +235,6 @@ domify = (doc, hash) ->
                                el.setAttribute k, v
        return el
 
-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 +=     'color: black;'
-       ret +=     'background: white;'
-       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 +=     '-ms-user-select: none;'
-       ret +=     '-webkit-user-select: none;'
-       ret +=     '-moz-user-select: none;'
-       ret +=     'user-select: none;'
-       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 +=     'width: 2px;'
-       ret +=     'background: linear-gradient(0deg, rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1));'
-       ret +=     'background-size: 200% 200%;'
-       ret +=     '-webkit-animation: blink 1s linear normal infinite;'
-       ret +=     'animation: blink 1s linear normal infinite;'
-       ret += '}'
-       ret += '@-webkit-keyframes blink {'
-       ret +=     '0%{background-position:0% 0%}'
-       ret +=     '100%{background-position:0% -100%}'
-       ret += '}'
-       ret += '@keyframes blink { '
-       ret +=     '0%{background-position:0% 0%}'
-       ret +=     '100%{background-position:0% -100%}'
-       ret += '}'
-       ret += '.ann_box {'
-       ret +=     'z-index: 5;'
-       ret +=     'position: absolute;'
-       ret +=     'border: 1px solid rgba(0,0,0,0.1);'
-       ret +=     'outline: 1px solid rgba(255,255,255,0.1);' # in case there's a black background
-       ret += '}'
-       ret += '.ann_tag {'
-       ret +=     'z-index: 10;'
-       ret +=     'position: absolute;'
-       ret +=     'font-size: 8px;'
-       ret +=     'white-space: pre;'
-       ret +=     'background: rgba(255,255,255,0.4);'
-       ret +=     '-ms-user-select: none;'
-       ret +=     '-webkit-user-select: none;'
-       ret +=     '-moz-user-select: none;'
-       ret +=     'user-select: none;'
-       ret += '}'
-       return ret
 
 
 ignore_key_codes =
@@ -698,14 +605,14 @@ class PeachHTML5Editor
                @outer_iframe # iframe to hold editor
                @outer_idoc # "document" object for @outer_iframe
                @wrap2 = null # scrollbar is on this
+               @wrap2_offset = null
+               @wrap2_height = null # including padding
                @iframe = null # iframe to hold editable content
                @idoc = null # "document" object for @iframe
                @cursor = null
                @cursor_el = null
                @cursor_visible = false
                @poll_for_blur_timeout = null
-               @wrap2_offset = null
-               @iframe_height = null
                opt_fragment = @options.fragment ? true
                @parser_opts = {}
                if opt_fragment
@@ -746,7 +653,7 @@ class PeachHTML5Editor
                        outer_bounds.h = 300
                outer_iframe_style += "width: #{outer_bounds.w}px; height: #{outer_bounds.h}px;"
                @outer_iframe.setAttribute 'style', outer_iframe_style
-               css = outer_css w: outer_bounds.w, h: outer_bounds.h
+               css = @generate_outer_css w: outer_bounds.w, h: outer_bounds.h
                outer_wrap.appendChild @outer_iframe
        init_1: -> # @iframe has loaded (but not it's css)
                @idoc = @iframe.contentDocument
@@ -783,6 +690,99 @@ class PeachHTML5Editor
                @load_html @in_el.value
                if @options.on_init?
                        @options.on_init()
+       generate_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
+               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 +=     'color: black;'
+               ret +=     'background: white;'
+               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;"
+               @wrap2_height = h # including padding because padding scrolls
+               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 +=     '-ms-user-select: none;'
+               ret +=     '-webkit-user-select: none;'
+               ret +=     '-moz-user-select: none;'
+               ret +=     'user-select: none;'
+               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 +=     'width: 2px;'
+               ret +=     'background: linear-gradient(0deg, rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1));'
+               ret +=     'background-size: 200% 200%;'
+               ret +=     '-webkit-animation: blink 1s linear normal infinite;'
+               ret +=     'animation: blink 1s linear normal infinite;'
+               ret += '}'
+               ret += '@-webkit-keyframes blink {'
+               ret +=     '0%{background-position:0% 0%}'
+               ret +=     '100%{background-position:0% -100%}'
+               ret += '}'
+               ret += '@keyframes blink { '
+               ret +=     '0%{background-position:0% 0%}'
+               ret +=     '100%{background-position:0% -100%}'
+               ret += '}'
+               ret += '.ann_box {'
+               ret +=     'z-index: 5;'
+               ret +=     'position: absolute;'
+               ret +=     'border: 1px solid rgba(0,0,0,0.1);'
+               ret +=     'outline: 1px solid rgba(255,255,255,0.1);' # in case there's a black background
+               ret += '}'
+               ret += '.ann_tag {'
+               ret +=     'z-index: 10;'
+               ret +=     'position: absolute;'
+               ret +=     'font-size: 8px;'
+               ret +=     'white-space: pre;'
+               ret +=     'background: rgba(255,255,255,0.4);'
+               ret +=     '-ms-user-select: none;'
+               ret +=     '-webkit-user-select: none;'
+               ret +=     '-moz-user-select: none;'
+               ret +=     'user-select: none;'
+               ret += '}'
+               return ret
        overlay_event_to_inner_xy: (e) ->
                unless @wrap2_offset?
                        @wrap2_offset = get_el_bounds @wrap2
@@ -1086,6 +1086,35 @@ class PeachHTML5Editor
                @cursor_el.style.top = "#{cursor.y + overlay_padding + Math.round(height * .07)}px"
                @cursor_el.style.height = "#{Math.round height * 0.82}px"
                @annotate cursor.n
+               @scroll_into_view cursor.y, height
+       scroll_into_view: (y, h = 0) ->
+               closest = 30 # setting: smallest pixels from top/bottom of screet that's OK
+               y += overlay_padding # convert units from @idoc to @wrap2
+               # very top of document
+               if y <= closest
+                       @wrap2.scrollTop = 0
+                       return
+               # very bottom of document
+               if y + h >= @wrap2.scrollHeight - closest
+                       @wrap2.scrollTop = @wrap2.scrollHeight - @wrap2_height
+                       return
+               # The most scrolled up (lowest value for scrollTop) that would be OK
+               upmost = y + h + closest - @wrap2_height
+               upmost = Math.max(upmost, 0)
+               # the most scrolled down (highest value for scrollTop) that would be OK
+               downmost = y - closest
+               downmost = Math.min(downmost, @wrap2.scrollHeight - @wrap2_height)
+               if upmost > downmost # means h is too big to fit
+                       # scroll so top is visible
+                       @wrap2.scrollTop = downmost
+                       return
+               if @wrap2.scrollTop < upmost
+                       @wrap2.scrollTop = upmost
+                       return
+               if @wrap2.scrollTop > downmost
+                       @wrap2.scrollTop = downmost
+                       return
+               return
        annotate: (n) ->
                while @matting.length > 0
                        @overlay.removeChild @matting[0]