Continue tinkering around with displaying images and moving them around in SWT

bt.rb

@@ -1,5 +1,6 @@
 #!/usr/bin/env ruby
 
+# XXX: Local hack to pick up the proper SWT classes on FreeBSD
 $CLASSPATH << '/usr/local/share/java/classes/swt.jar'
 
 require 'java'
@@ -9,9 +10,13 @@ require 'rubygems'
 require 'colorize'
 require 'flickr'
 
-
 puts 'Starting bt'.green
 
 config =  YAML.load(File.open('.flickr.yml').read)
-puts "Using Flickr API configuration: #{config}".yellow
+#puts "Using Flickr API configuration: #{config}".yellow
 
+require_relative 'bt/main'
+
+puts '..ending bt'.green
+
+BT::Main.new.run

bt/main.rb

@@ -0,0 +1,81 @@
+
+module BT
+  class Main
+    include_package 'org.eclipse.swt'
+    include_package 'org.eclipse.swt.layout'
+    include_package 'org.eclipse.swt.graphics'
+    include_package 'org.eclipse.swt.widgets'
+
+    attr_reader :display, :shell
+    def initialize
+      @display = Display.new
+      @shell = Shell.new display
+    end
+
+    def prepare
+      Display.app_name = 'BT'
+
+      shell.setSize(450, 200)
+
+      layout = RowLayout.new
+      layout.wrap = true
+
+      shell.layout = layout
+      shell.text = 'BT in JRuby'
+      stop_scroll = false
+
+      b = Button.new(shell, SWT::PUSH)
+      b.add_selection_listener do |event|
+        if stop_scroll
+          puts 'starting'
+          stop_scroll = false
+          b.text = 'Stop scroll'
+        else
+          puts 'stopping'
+          stop_scroll = true
+          b.text = 'start scroll'
+        end
+      end
+      b.text = 'stop scroll'
+
+      label = Label.new(shell, SWT::CENTER)
+      image = Image.new(display, File.expand_path('./jruby.png'))
+      label.image = image
+
+      Thread.new do
+        loop do
+          while stop_scroll do
+            sleep 0.5
+          end
+
+          # Execute the movement in the display thread
+          display.sync_exec do
+            p = Point.new(label.location.x, label.location.y + 2)
+            label.location = p
+          end
+          sleep 1
+        end
+      end
+
+      shell.pack
+      shell.open
+    end
+
+    def run
+      prepare
+
+      until shell.is_disposed do
+        unless display.read_and_dispatch
+          display.sleep
+        end
+      end
+
+      shutdown
+    end
+
+    def shutdown
+      display.dispose
+    end
+  end
+end
+

build.gradle

@@ -13,10 +13,13 @@ import com.github.jrubygradle.JRubyExec
 dependencies {
     jrubyExec 'rubygems:colorize:0.7.3+'
     jrubyExec 'rubygems:flickr.rb:1.2.1+'
+    jrubyExec 'rubygems:pry:0.10.1+'
 }
 
+
 task ticker(type: JRubyExec) {
-    script 'bt'
+    standardInput System.in
+    script 'bt.rb'
 }
 
 // vim: ft=groovy