Class: TerminalNotes::TextField

Inherits:
Object
  • Object
show all
Defined in:
lib/terminal-notes/text_field.rb

Constant Summary collapse

DEFAULT_WIDTH = 
10
BREAK_CHARS = 
" -_+=".split('')

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(screen, position: Cursor.new, width: DEFAULT_WIDTH) ⇒ TextField

Returns a new instance of TextField.



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# File 'lib/terminal-notes/text_field.rb', line 8

def initialize(screen, position: Cursor.new, width: DEFAULT_WIDTH)
    @screen = screen
    @start  = position.dup
    @end    = @start.dup.moveBy(width, 0)
    @width  = width
    @cursor = @start.dup

    @clear_text = " " * @width
    @text = ""

    @on_text_changed_delegates = []
end

Instance Attribute Details

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/terminal-notes/text_field.rb', line 3

def text
  @text
end

Instance Method Details

#draw ⇒ Object 



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# File 'lib/terminal-notes/text_field.rb', line 82

def draw
    @screen.move_cursor(@start.to_hash)
    @screen.draw_string(@text.ljust(@width))

    @screen.move_cursor(@cursor.to_hash)
end

#notify_text_changed ⇒ Object 



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# File 'lib/terminal-notes/text_field.rb', line 25

def notify_text_changed
    @on_text_changed_delegates.each do |delegate|
        delegate.call(@text)
    end
end

#on_key(key) ⇒ Object 



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# File 'lib/terminal-notes/text_field.rb', line 31

def on_key(key)
    old_text = @text
    case key
    when :BACKSPACE
        @text = @text[0...-1]
        @cursor.moveBy(-1) unless @text.size == (@width - 1)

    when :UP, :DOWN
    when :LEFT
        @cursor.moveBy(-1)

    when :RIGHT
        @cursor.moveBy(1)

    when :CTRL_K
        @text = ""

    when :CTRL_W
        last = @text.size - 2
        while last >= 0
            break if BREAK_CHARS.include? @text[last]
            last -= 1
        end
        @text = @text[0...(last+1)]

    when :CTRL_E
        @cursor.moveTo(x: @end.x)

    when :CTRL_A
        @cursor.moveTo(x: @start.x)

    else
        if !key.nil? && !key.is_a?(Symbol) && @text.size < @width
            @text += key
            @cursor.moveBy(1)
        end
    end

    # Make sure we don't move cursor too far left
    @cursor.moveTo(x: @start.x) if @cursor.x < @start.x

    # Make sure we don't move cursor too far right
    max_x = @start.x + @text.size
    max_x -= 1 if @text.size == @width
    @cursor.moveTo(x: max_x) if @cursor.x > max_x

    draw

    notify_text_changed if old_text != @text
end

#on_text_changed(&block) ⇒ Object 



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# File 'lib/terminal-notes/text_field.rb', line 21

def on_text_changed &block
    @on_text_changed_delegates << block
end