Add checkboxes example

example/examples/general/checkboxes/checkboxes.collection

@@ -0,0 +1,37 @@
+name: "checkboxes"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"checkboxes\"\n"
+  "  component: \"/example/examples/general/checkboxes/checkboxes.gui\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

example/examples/general/checkboxes/checkboxes.gui_script

@@ -0,0 +1,45 @@
+local druid = require("druid.druid")
+
+
+local function on_single_checkbox(self, value)
+	print("Single checkbox callback. Value:", value)
+end
+
+
+function init(self)
+	self.druid = druid.new(self)
+
+	local single_checkbox = self.druid:new_checkbox("checkbox/check", on_single_checkbox)
+
+	local radio_group = self.druid:new_radio_group(
+		{"radio1/check", "radio2/check", "radio3/check"},
+		nil,
+		{"radio1/back", "radio2/back", "radio3/back"}) -- last row optional. It's input node (default - click node)
+	radio_group:set_state(2, true)
+
+	local checkbox_group = self.druid:new_checkbox_group(
+		{"checkbox1/check", "checkbox2/check", "checkbox3/check"},
+		nil,
+		{"checkbox1/back", "checkbox2/back", "checkbox3/back"}) -- last row optional. It's input node (default - click node)
+	checkbox_group:set_state({true, false, true}, true)
+end
+
+
+function final(self)
+	self.druid:final()
+end
+
+
+function update(self, dt)
+	self.druid:update(dt)
+end
+
+
+function on_message(self, message_id, message, sender)
+	self.druid:on_message(message_id, message, sender)
+end
+
+
+function on_input(self, action_id, action)
+	return self.druid:on_input(action_id, action)
+end