Class: Canis::Scrollbar

Inherits:
Widget show all
Defined in:
lib/canis/core/widgets/scrollbar.rb

Overview

Since:

  • 1.2.0 UNTESTED

Instance Attribute Summary

Attributes inherited from Widget

#_object_created, #col_offset, #config, #curpos, #focussed, #form, #handler, #id, #key_label, #parent_component, #row_offset, #state

Instance Method Summary collapse

Methods inherited from Widget

#action_manager, #bgcolor, #color, #color_pair, #command, #destroy, #focus, #focusable, #focusable?, #getvalue, #getvalue_for_paint, #handle_key, #hide, #init_vars, #modified?, #move, #on_enter, #on_leave, #override_graphic, #process_key, #property_set, #remove, #repaint_all, #repaint_required, #rowcol, #set_form, #set_form_col, #set_form_row, #set_modified, #setformrowcol, #setrowcol, #show, #unbind_key

Methods included from Io

#__create_footer_window, #clear_this, #get_file, #print_this, #rb_getchar, #rb_gets, #rb_getstr, #warn

Methods included from Utils

#ORIG_process_key, #ORIGbind_key, #ORIGkeycode_tos, #_process_key, #bind_composite_mapping, #bind_key, #bind_keys, #check_composite_mapping, #create_logger, #define_key, #define_prefix_command, #execute_mapping, #get_attrib, #get_color, #key, #key_tos, #print_key_bindings, #repeatm, #run_command, #shell_out, #shell_output, #suspend, #view, #xxxbind_composite_mapping

Methods included from ConfigSetup

#config_setup, #variable_set

Methods included from EventHandler

#bind, #event?, #event_list, #fire_handler, #fire_property_change, #register_events

Constructor Details

#initialize(form, config = {}, &block) ⇒ Scrollbar

TODO: if parent passed, we shold bind to ON_ENTER and get current_index, so no extra work is required.

Since:

  • 1.2.0 UNTESTED



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# File 'lib/canis/core/widgets/scrollbar.rb', line 38

def initialize form, config={}, &block

  # setting default first or else Widget will place its BW default
  #@color, @bgcolor = ColorMap.get_colors_for_pair $bottomcolor
  super
  @color_pair = get_color $datacolor, @color, @bgcolor
  @scroll_pair = get_color $bottomcolor, :green, :white
  #$log.debug "SCROLLBAR COLOR cp #{@color_pair} sp #{@scroll_pair} " if $log.debug? 
  @window = form.window
  @editable = false
  @focusable = false
  @repaint_required = true
  @orientation = :V
  if @parent
    @parent.bind :ENTER_ROW do |p|
      # textview sent self, textpad sends textactionevent
      if p.instance_of? TextActionEvent
        p = p.source
      end
      # parent must implement row_count, and have a @current_index
      raise StandardError, "Parent (#{p.class.to_s}) must implement row_count" unless p.respond_to? :row_count
      self.current_index = p.current_index
      @repaint_required = true  #requred otherwise at end when same value sent, prop handler
      # will not be fired (due to optimization).
    end
    # in some cases, on leaving a listbox or other component redraws itself to reduce
    # selected or highlighted object, so the scrollbar gets overwritten. We need to repaint it.
    @parent.bind :LEAVE do |p|
      @repaint_required = true  
    end
  end
end

Instance Method Details

#repaint ⇒ Object

repaint the scrollbar Taking the data from parent as late as possible in case parent resized, or moved around by a container.

Raises:

  • (ArgumentError)

Since:

  • 1.2.0 UNTESTED



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# File 'lib/canis/core/widgets/scrollbar.rb', line 75

def repaint
  if @parent
    @row = @parent.row+1
    @col = @parent.col + @parent.width - 1
    @length = @parent.height - 2
    @list_length = @parent.row_count 
    @current_index ||= @parent.current_index
    @border_attrib ||= @parent.border_attrib
  end
  raise ArgumentError, "current_index must be provided" unless @current_index
  raise ArgumentError, "list_length must be provided" unless @list_length
  my_win = @form ? @form.window : @target_window
  @graphic = my_win unless @graphic
  return unless @repaint_required

  # 2016-01-14 - replacing 1 with space in mvvline since junk is showing up in some cases.
  space_char = " ".codepoints.first

  # first print a right side vertical line
  #bc = $bottomcolor  # dark blue
  bc = $datacolor
  bordercolor = @border_color || bc
  borderatt = @border_attrib || Ncurses::A_REVERSE
  #$log.debug "SCROLL bordercolor #{bordercolor} , #{borderatt} " if $log.debug? 


  @graphic.attron(Ncurses.COLOR_PAIR(bordercolor) | borderatt)
  #$log.debug " XXX SCROLL #{@row} #{@col} #{@length} "
  @graphic.mvvline(@row+0, @col, space_char, @length-0)
  @graphic.attroff(Ncurses.COLOR_PAIR(bordercolor) | borderatt)

  # now calculate and paint the scrollbar
  pht = @length
  listlen = @list_length * 1.0
  @current_index = 0 if @current_index < 0
  @current_index = listlen-1 if @current_index >= listlen
  sclen = (pht/listlen)* @length
  sclen = 1 if sclen < 1 # sometimes 0.7 for large lists 100 items 2011-10-1 
  scloc = (@current_index/listlen)* @length
  scloc = (@length - sclen) if scloc > @length - sclen # don't exceed end
  if @current_index == @list_length - 1
    scloc = @length - sclen + 0 # earlier 1, but removed since sclen min 1 2011-10-1 
  end
  @graphic.attron(Ncurses.COLOR_PAIR(@scroll_pair) | borderatt)
  r = @row + scloc
  c = @col + 0
  #$log.debug " XXX SCROLLBAR #{r} #{c} #{sclen} "
  @graphic.mvvline(r, c, space_char, sclen)
  @graphic.attroff(Ncurses.COLOR_PAIR(@scroll_pair) | borderatt)
  @repaint_required = false
end