Glimmer DSL for SWT 4.20.13.11 just shipped with an implementation of Conway's Game of Life. A simpler version was blogged about many years ago, but it has been enhanced to be canvas-based instead of button-based.
The models Grid and Cell were written test first.
Otherwise, the GUI simply binds to the grid cells (the same way the Tic Tac Toe elaborate sample was implemented)
# From: https://github.com/AndyObtiva/glimmer-dsl-swt/blob/master/docs/reference/GLIMMER_SAMPLES.md#game-of-life require 'glimmer-dsl-swt' require_relative 'game_of_life/model/grid' class GameOfLife include Glimmer::UI::CustomShell WIDTH = 20 HEIGHT = 20 CELL_WIDTH = 25 CELL_HEIGHT = 25 before_body do @grid = GameOfLife::Model::Grid.new(WIDTH, HEIGHT) end body { shell { row_layout :vertical text "Conway's Game of Life (Glimmer Edition)" canvas { layout_data { width WIDTH*CELL_WIDTH height HEIGHT*CELL_HEIGHT } (0...HEIGHT).each do |row_index| (0...WIDTH).each do |column_index| rectangle(column_index*CELL_WIDTH, row_index*CELL_HEIGHT, CELL_WIDTH, CELL_HEIGHT) { background <= [@grid.cell_rows[row_index][column_index], "alive", on_read: ->(a) {a ? :black : :white}] on_mouse_down { @grid.cell_rows[row_index][column_index].toggle_aliveness! } } end end } composite { row_layout(:horizontal) { margin_width 0 } button { text 'Step' enabled <= [@grid, :playing, on_read: :! ] on_widget_selected { @grid.step! } } button { text 'Clear' enabled <= [@grid, :playing, on_read: :! ] on_widget_selected { @grid.clear! } } button { text <= [@grid, :playing, on_read: ->(p) { p ? 'Stop' : 'Play' }] on_widget_selected { @grid.toggle_playback! } } label { text 'Slower' } scale { minimum 1 maximum 100 selection <=> [@grid, :speed] } label { text 'Faster' } } } } end GameOfLife.launch Animated Screenshot:
Glimmer DSL for SWT enables writing desktop applications in Ruby (JRuby) in a fraction of the time they normally take in other languages (think hours and days for an MVP instead of weeks and months)
Happy Glimmering!
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