Introduce abstract-chosen, try to start sharing more code between platforms

coffee/lib/abstract-chosen.coffee

@@ -0,0 +1,102 @@
+###
+Chosen source: generate output using 'cake build'
+Copyright (c) 2011 by Harvest
+###
+root = this
+
+class AbstractChosen
+
+  constructor: (elmn) ->
+    this.set_default_values()
+    
+    @form_field = elmn
+    @is_multiple = @form_field.multiple
+    @default_text_default = if @is_multiple then "Select Some Options" else "Select an Option"
+
+    this.setup()
+
+    this.set_up_html()
+    this.register_observers()
+
+    this.finish_setup()
+
+  set_default_values: ->
+    @click_test_action = (evt) => this.test_active_click(evt)
+    @active_field = false
+    @mouse_on_container = false
+    @results_showing = false
+    @result_highlighted = null
+    @result_single_selected = null
+    @choices = 0
+
+  mouse_enter: -> @mouse_on_container = true
+  mouse_leave: -> @mouse_on_container = false
+
+  input_focus: (evt) ->
+    setTimeout (=> this.container_mousedown()), 50 unless @active_field
+  
+  input_blur: (evt) ->
+    if not @mouse_on_container
+      @active_field = false
+      setTimeout (=> this.blur_test()), 100
+
+  result_add_option: (option) ->
+    if not option.disabled
+      option.dom_id = @container_id + "_o_" + option.array_index
+      
+      classes = if option.selected and @is_multiple then [] else ["active-result"]
+      classes.push "result-selected" if option.selected
+      classes.push "group-option" if option.group_array_index?
+      
+      '<li id="' + option.dom_id + '" class="' + classes.join(' ') + '">' + option.html + '</li>'
+    else
+      ""
+
+  results_update_field: ->
+    this.result_clear_highlight()
+    @result_single_selected = null
+    this.results_build()
+
+  results_toggle: ->
+    if @results_showing
+      this.results_hide()
+    else
+      this.results_show()
+
+  results_search: (evt) ->
+    if @results_showing
+      this.winnow_results()
+    else
+      this.results_show()
+
+  keyup_checker: (evt) ->
+    stroke = evt.which ? evt.keyCode
+    this.search_field_scale()
+
+    switch stroke
+      when 8
+        if @is_multiple and @backstroke_length < 1 and @choices > 0
+          this.keydown_backstroke()
+        else if not @pending_backstroke
+          this.result_clear_highlight()
+          this.results_search()
+      when 13
+        evt.preventDefault()
+        this.result_select(evt) if this.results_showing
+      when 27
+        this.results_hide() if @results_showing
+      when 9, 38, 40, 16, 91, 17
+        # don't do anything on these keys
+      else this.results_search()
+
+  generate_field_id: ->
+    new_id = this.generate_random_id()
+    @form_field.id = new_id
+    new_id
+  
+  generate_random_char: ->
+    chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZ"
+    rand = Math.floor(Math.random() * chars.length)
+    newchar = chars.substring rand, rand+1
+
+root.AbstractChosen = AbstractChosen