Class: RubyCurses::Field

Inherits:
Widget show all
Defined in:
lib/rbcurse/core/widgets/rwidget.rb

Overview

Text edit field NOTE: To get value use getvalue() TODO - test text_variable TODO: some methods should return self, so chaining can be done. Not sure if the return value of the 

fire_handler is being checked.
NOTE: i have just added repain_required check in Field before repaint
this may mean in some places field does not paint. repaint_require will have to be set
to true in those cases. this was since field was overriding a popup window that was not modal.

Since:

  • 1.2.0

Direct Known Subclasses

ComboBox

Instance Attribute Summary collapse

Attributes inherited from Widget

#_object_created, #col_offset, #cols_panned, #config, #curpos, #focussed, #id, #key_label, #parent_component, #row_offset, #rows_panned, #state

Instance Method Summary collapse

Methods inherited from Widget

#action_manager, #changed, #click, #color_pair, #command, #destroy, #enter, #event_list, #focus, #get_preferred_size, #getvalue_for_paint, #height, #height=, #hide, #leave, #move, #override_graphic, #process_key, #remove, #repaint_all, #repaint_required, #rowcol, #set_buffer_modified, #set_buffering, #set_form, #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, #rbgetstr, #warn

Methods included from Utils

#OLDdefine_key, #_process_key, #bind_key, #bind_keys, #clean_string!, #define_key, #define_prefix_command, #display_app_help, #get_attrib, #get_color, #keycode_tos, #last_line, #one_line_window, #parse_formatted_text, #print_key_bindings, #repeatm, #run_command, #shell_out, #shell_output, #suspend, #view, #wrap_text

Methods included from ConfigSetup

#cget, #config_setup, #configure, #variable_set

Methods included from EventHandler

#bind, #fire_handler, #fire_property_change

Constructor Details

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

Returns a new instance of Field.

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2110

def initialize form=nil, config={}, &block
  @form = form
  @buffer = String.new
  #@type=config.fetch("type", :varchar)
  @row = 0
  @col = 0
  #@bgcolor = $def_bg_color
  #@color = $def_fg_color
  @editable = true
  @focusable = true
  @event_args = {}             # arguments passed at time of binding, to use when firing event
  map_keys 
  init_vars
  @_events ||= []
  @_events.push(:CHANGE)
  super
  @display_length ||= 20
  @maxlen ||= @display_length
end

Instance Attribute Details

#buffer ⇒ Object (readonly)

actual buffer being used for storage

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2072

def buffer
  @buffer
end

#datatype ⇒ Object

attr_reader :curpos # cursor position in buffer current, in WIDGET

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2099

def datatype
  @datatype
end

#field_col ⇒ Object (readonly)

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2103

def field_col
  @field_col
end

#form ⇒ Object (readonly)

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2095

def form
  @form
end

#handler ⇒ Object (readonly)

event handler

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2096

def handler
  @handler
end

#original_value ⇒ Object (readonly)

value on entering field

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2100

def original_value
  @original_value
end

#overwrite_mode ⇒ Object

true or false INSERT OVERWRITE MODE

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2101

def overwrite_mode
  @overwrite_mode
end

#type(dtype) ⇒ Object (readonly)

define a datatype, currently only influences chars allowed integer and float. what about allowing a minus sign?

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2097

def type
  @type
end

Instance Method Details

#addcol(num) ⇒ Object

add a column to cursor position. Field

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2493

def addcol num
  if num < 0
    if @form.col <= @col + @col_offset
     # $log.debug " error trying to cursor back #{@form.col}"
      return -1
    end
  elsif num > 0
    if @form.col >= @col + @col_offset + @display_length
  #    $log.debug " error trying to cursor forward #{@form.col}"
      return -1
    end
  end
  @form.addcol num
end

#cursor_backward ⇒ Object

$log.debug “ crusor FORWARD cp:#@curpos pcol:#@pcol b.l:#RubyCurses::Field.@[email protected] d_l:#@display_length fc:#RubyCurses::Field.@[email protected]”

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2453

def cursor_backward
  if @curpos > 0
    @curpos -= 1
    if @pcol > 0 and @form.col == @col + @col_offset
      @pcol -= 1
    end
    addcol -1
  elsif @pcol > 0 #  added 2008-11-26 23:05 
    @pcol -= 1   
  end
 #   $log.debug " crusor back cp:#{@curpos} pcol:#{@pcol} b.l:#{@buffer.length} d_l:#{@display_length} fc:#{@form.col}"
=begin
# this is perfect if not scrolling, but now needs changes
  if @curpos > 0
    @curpos -= 1
    addcol -1
  end
=end
end

#cursor_end ⇒ Object

goto end of field, “end” is a keyword so could not use it.

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2406

def cursor_end
  blen = @buffer.rstrip.length
  if blen < @display_length
    set_form_col blen
  else
    # there is a problem here FIXME. 
    @pcol = blen-@display_length
    #set_form_col @display_length-1
    set_form_col blen
  end
  @curpos = blen # this is position in array where editing or motion is to happen regardless of what you see
                 # regardless of pcol (panning)
  #  $log.debug " crusor END cp:#{@curpos} pcol:#{@pcol} b.l:#{@buffer.length} d_l:#{@display_length} fc:#{@form.col}"
  #set_form_col @buffer.length
end

#cursor_forward ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2444

def cursor_forward
  if @curpos < @buffer.length 
    if addcol(1)==-1  # go forward if you can, else scroll
      @pcol += 1 if @pcol < @display_length 
    end
    @curpos += 1
  end
 # $log.debug " crusor FORWARD cp:#{@curpos} pcol:#{@pcol} b.l:#{@buffer.length} d_l:#{@display_length} fc:#{@form.col}"
end

#cursor_home ⇒ Object

position cursor at start of field

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2399

def cursor_home
  @curpos = 0
  @pcol = 0
  set_form_col 0
end

#delete_at(index = @curpos) ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2219

def delete_at index=@curpos
  return -1 if !@editable 
  char = @buffer.slice!(index,1)
  #$log.debug " delete at #{index}: #{@buffer.length}: #{@buffer}"
  @modified = true
  #fire_handler :CHANGE, self    # 2008-12-09 14:51 
  fire_handler :CHANGE, InputDataEvent.new(@curpos,@curpos, self, :DELETE, 0, char)     # 2010-09-11 13:01 
end

#delete_curr_char ⇒ Object

# this is perfect if not scrolling, but now needs changes

if @curpos > 0
  @curpos -= 1
  addcol -1
end

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2472

def delete_curr_char
  return -1 unless @editable
  delete_at
  set_modified 
end

#delete_eol ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2434

def delete_eol
  return -1 unless @editable
  pos = @curpos-1
  @delete_buffer = @buffer[@curpos..-1]
  # if pos is 0, pos-1 becomes -1, end of line!
  @buffer = pos == -1 ? "" : @buffer[0..pos]
  #fire_handler :CHANGE, self    # 2008-12-09 14:51 
  fire_handler :CHANGE, InputDataEvent.new(@curpos,@curpos+@delete_buffer.length, self, :DELETE, 0, @delete_buffer)     # 2010-09-11 13:01 
  return @delete_buffer
end

#delete_prev_char ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2477

def delete_prev_char
  return -1 if !@editable 
  return if @curpos <= 0
  # if we've panned, then unpan, and don't move cursor back
  # Otherwise, adjust cursor (move cursor back as we delete)
  adjust = true
  if @pcol > 0
    @pcol -= 1
    adjust = false
  end
  @curpos -= 1 if @curpos > 0
  delete_at
  addcol -1 if adjust # move visual cursor back
  set_modified 
end

#getvalue ⇒ Object

converts back into original type

changed to convert on 2009-01-06 23:39

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2255

def getvalue
  dt = @datatype || String
  case dt.to_s
  when "String"
    return @buffer
  when "Fixnum"
    return @buffer.to_i
  when "Float"
    return @buffer.to_f
  else
    return @buffer.to_s
  end
end

#handle_key(ch) ⇒ Object

field

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2375

def handle_key ch
  @repaint_required = true 
  #map_keys unless @keys_mapped # moved to init
  case ch
  when 32..126
    #$log.debug("FIELD: ch #{ch} ,at #{@curpos}, buffer:[#{@buffer}] bl: #{@buffer.to_s.length}")
    putc ch
  when 27 # cannot bind it
    set_buffer @original_value 
  else
    ret = super
    return ret
  end
  0 # 2008-12-16 23:05 without this -1 was going back so no repaint
end

#init_vars ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2129

def init_vars
  @pcol = 0                    # needed for horiz scrolling
  @curpos = 0                  # current cursor position in buffer
                               # this is the index where characters are put or deleted
  #                            # when user edits
  @modified = false
  @repaint_required = true
end

#map_keys ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2357

def map_keys
  return if @keys_mapped
  bind_key(FFI::NCurses::KEY_LEFT, :cursor_backward )
  bind_key(FFI::NCurses::KEY_RIGHT, :cursor_forward )
  bind_key(FFI::NCurses::KEY_BACKSPACE, :delete_prev_char )
  bind_key(127, :delete_prev_char )
  bind_key(330, :delete_curr_char )
  bind_key(?\C-a, :cursor_home )
  bind_key(?\C-e, :cursor_end )
  bind_key(?\C-k, :delete_eol )
  bind_key(?\C-_, :undo_delete_eol )
  #bind_key(27){ set_buffer @original_value }
  bind_key(?\C-g, 'revert'){ set_buffer @original_value } # 2011-09-29 V1.3.1 ESC did not work
  @keys_mapped = true
end

#modified? ⇒ Boolean

overriding widget, check for value change

2009-01-18 12:25

Returns:

  • (Boolean)

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2551

def modified?
  getvalue() != @original_value
end

#on_enter ⇒ Object

save original value on enter, so we can check for modified.

2009-01-18 12:25 
 2011-10-9 I have changed to take @buffer since getvalue returns a datatype
 and this causes a crash in set_original on cursor forward.

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2543

def on_enter
  #@original_value = getvalue.dup rescue getvalue
  @original_value = @buffer.dup # getvalue.dup rescue getvalue
  super
end

#on_leave ⇒ Object

upon leaving a field returns false if value not valid as per values or valid_regex 2008-12-22 12:40 if null_allowed, don’t validate, but do fire_handlers

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2510

def on_leave
  val = getvalue
  #$log.debug " FIELD ON LEAVE:#{val}. #{@values.inspect}"
  valid = true
  if val.to_s.empty? && @null_allowed
    #$log.debug " empty and null allowed"
  else
    if !@values.nil?
      valid = @values.include? val
      raise FieldValidationException, "Field value (#{val}) not in values: #{@values.join(',')}" unless valid
    end
    if !@valid_regex.nil?
      valid = @valid_regex.match(val.to_s)
      raise FieldValidationException, "Field not matching regex #{@valid_regex}" unless valid
    end
    # added valid_range for numerics 2011-09-29 
    if !@valid_range.nil?
      valid = @valid_range.include?(val.to_i)
      raise FieldValidationException, "Field not matching range #{@valid_range}" unless valid
    end
  end
  # here is where we should set the forms modified to true - 2009-01
  if modified?
    set_modified true
  end
  # if super fails we would have still set modified to true
  super
  #return valid
end

#position_label ⇒ Object

FIXME this may not work since i have disabled -1, now i do not set row and col

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2295

def position_label
  $log.debug "XXX: LABEL row #{@label.row}, #{@label.col} "
  @label.row  @row unless @label.row #if @label.row == -1
  @label.col  @col-(@label.name.length+1) unless @label.col #if @label.col == -1
  @label.label_for(self) # this line got deleted when we redid stuff !
  $log.debug "   XXX: LABEL row #{@label.row}, #{@label.col} "
end

#putc(c) ⇒ Object

TODO : sending c>=0 allows control chars to go. Should be >= ?A i think.

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2203

def putc c
  if c >= 0 and c <= 127
    ret = putch c.chr
    if ret == 0
      if addcol(1) == -1  # if can't go forward, try scrolling
        # scroll if exceeding display len but less than max len
        if @curpos > @display_length && @curpos <= @maxlen
          @pcol += 1 if @pcol < @display_length 
        end
      end
      set_modified 
      return 0 # 2010-09-11 12:59 else would always return -1
    end
  end
  return -1
end

#putch(char) ⇒ Fixnum

add a char to field, and validate NOTE: this should return self for chaining operations and throw an exception if disabled or exceeding size

Parameters:

  • a (char) —

    character to add

Returns:

  • (Fixnum) —

    0 if okay, -1 if not editable or exceeding length

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2173

def putch char
  return -1 if !@editable 
  return -1 if !@overwrite_mode && (@buffer.length >= @maxlen)
  if @chars_allowed != nil
    return if char.match(@chars_allowed).nil?
  end
  # added insert or overwrite mode 2010-03-17 20:11 
  oldchar = nil
  if @overwrite_mode
    oldchar = @buffer[@curpos] 
    @buffer[@curpos] = char
  else
    @buffer.insert(@curpos, char)
  end
  oldcurpos = @curpos
  $log.warn "XXX:  FIELD CURPOS #{@curpos} "
  @curpos += 1 if @curpos < @maxlen
  @modified = true
  #$log.debug " FIELD FIRING CHANGE: #{char} at new #{@curpos}: bl:#{@buffer.length} buff:[#{@buffer}]"
  # i have no way of knowing what change happened and what char was added deleted or changed
  #fire_handler :CHANGE, self    # 2008-12-09 14:51 
  if @overwrite_mode
    fire_handler :CHANGE, InputDataEvent.new(oldcurpos,@curpos, self, :DELETE, 0, oldchar) # 2010-09-11 12:43 
  end
  fire_handler :CHANGE, InputDataEvent.new(oldcurpos,@curpos, self, :INSERT, 0, char) # 2010-09-11 12:43 
  0
end

#repaint ⇒ Object

Note that some older widgets like Field repaint every time the form.repaint + is called, whether updated or not. I can’t remember why this is, but + currently I’ve not implemented events with these widgets. 2010-01-03 15:00

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2307

def repaint
  return unless @repaint_required  # 2010-11-20 13:13 its writing over a window i think TESTING
  if @label_unattached
    alert "came here unattachd"
    @label.set_form(@form)
  end
  if @label_unplaced
    alert "came here unplaced"
    position_label
  end
  @bgcolor ||= $def_bg_color
  @color   ||= $def_fg_color
  $log.debug("repaint FIELD: #{id}, #{name}, #{row} #{col},pcol:#{@pcol},  #{focusable} st: #{@state} ")
  #return if display_length <= 0 # added 2009-02-17 00:17 sometimes editor comp has 0 and that
  # becomes negative below, no because editing still happens
  @display_length = 1 if display_length == 0
  printval = getvalue_for_paint().to_s # added 2009-01-06 23:27 
  printval = show()*printval.length unless @show.nil?
  if !printval.nil? 
    if printval.length > display_length # only show maxlen
      printval = printval[@pcol..@pcol+display_length-1] 
    else
      printval = printval[@pcol..-1]
    end
  end

  acolor = @color_pair || get_color($datacolor, @color, @bgcolor)
  if @state == :HIGHLIGHTED
    _bgcolor = @highlight_background || @bgcolor
    _color = @highlight_foreground || @color
    acolor = get_color(acolor, _color, _bgcolor)
  end
  @graphic = @form.window if @graphic.nil? ## cell editor listbox hack 
  #$log.debug " Field g:#{@graphic}. r,c,displen:#{@row}, #{@col}, #{@display_length} c:#{@color} bg:#{@bgcolor} a:#{@attr} :#{@name} "
  r = row
  c = col
  if label.is_a? String
    lcolor = @label_color_pair || $datacolor # this should be the same color as window bg XXX
    lattr = @label_attr || NORMAL
    @graphic.printstring row, col, label, lcolor, lattr
    c += label.length + 2
    @col_offset = c-@col            # required so cursor lands in right place
  end
  @graphic.printstring r, c, sprintf("%-*s", display_length, printval), acolor, @attr
  @field_col = c
  @repaint_required = false
end

#restore_original_value ⇒ Object

silently restores value without firing handlers, use if exception and you want old value

Since:

  • 1.4.0 2011-10-2



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2230

def restore_original_value
  @buffer = @original_value.dup
  #@curpos = 0 # this would require restting setformcol
  @repaint_required = true
end

#set_buffer(value) ⇒ Object

should this do a dup ?? YES set value of Field fires CHANGE handler

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2239

def set_buffer value
  @repaint_required = true
  @datatype = value.class
  #$log.debug " FIELD DATA #{@datatype}"
  @delete_buffer = @buffer.dup
  @buffer = value.to_s.dup
  # don't allow setting of value greater than maxlen
  @buffer = @buffer[0,@maxlen] if @maxlen && @buffer.length > @maxlen
  @curpos = 0
  # hope @delete_buffer is not overwritten
  fire_handler :CHANGE, InputDataEvent.new(@curpos,@curpos, self, :DELETE, 0, @delete_buffer)     # 2010-09-11 13:01 
  fire_handler :CHANGE, InputDataEvent.new(@curpos,@curpos, self, :INSERT, 0, @buffer)     # 2010-09-11 13:01 
  self # 2011-10-2 
end

#set_focusable(tf) ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2354

def set_focusable(tf)
  @focusable = tf
end

#set_form_col(col1 = @curpos) ⇒ Object

sets the visual cursor on the window at correct place added here since we need to account for pcol. 2011-12-7 NOTE be careful of curpos - pcol being less than 0

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2424

def set_form_col col1=@curpos
  @curpos = col1 || 0 # NOTE we set the index of cursor here
  c = @col + @col_offset + @curpos - @pcol
  min = @col + @col_offset
  max = min + @display_length
  c = min if c < min
  c = max if c > max
  $log.debug " #{@name} FIELD set_form_col #{c}, curpos #{@curpos}  , #{@col} + #{@col_offset} pcol:#{@pcol} "
  setrowcol nil, c
end

#set_label(label) ⇒ Object

create a label linked to this field Typically one passes a Label, but now we can pass just a String, a label is created NOTE: 2011-10-20 when field attached to some container, label won’t be attached FIXME this may not work since i have disabled -1, now i do not set row and col 2011-11-5

Parameters:

  • label (Label, String) —

    object to be associated with this field

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2275

def set_label label
  # added case for user just using a string
  case label
  when String
    # what if no form at this point
    @label_unattached = true unless @form
    label = Label.new @form, {:text => label}
  end
  @label = label
  # in the case of app it won't be set yet FIXME
  # So app sets label to 0 and t his won't trigger
  # can this be delayed to when paint happens XXX
  if @row
    position_label
  else
    @label_unplaced = true
  end
  label
end

#text(*val) ⇒ Object Also known as: default

Use this to set a default text to the field. This does not imply that if the field is left blank, this value will be used. It only provides this value for editing when field is shown.

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2558

def text(*val)
  if val.empty?
    return getvalue()
  else
    return unless val # added 2010-11-17 20:11, dup will fail on nil
    return unless val[0]
    s = val[0].dup
    set_buffer(s)
  end
end

#text=(val) ⇒ Object

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2569

def text=(val)
  return unless val # added 2010-11-17 20:11, dup will fail on nil
  set_buffer(val.dup)
end

#text_variable(tv) ⇒ Object

Set Variable as value. 

This allows using Field as a proxy
@param [Variable] variable containing text value

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2143

def text_variable tv
  @text_variable = tv
  set_buffer tv.value
end

#undo_delete_eol ⇒ Object

does an undo on delete_eol, not a real undo

Since:

  • 1.2.0



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# File 'lib/rbcurse/core/widgets/rwidget.rb', line 2391

def undo_delete_eol
  return if @delete_buffer.nil?
  #oldvalue = @buffer
  @buffer.insert @curpos, @delete_buffer 
  fire_handler :CHANGE, InputDataEvent.new(@curpos,@curpos+@delete_buffer.length, self, :INSERT, 0, @delete_buffer)     # 2010-09-11 13:01 
end