karaoke.json

{
  "document": {
    "type": "APL",
    "version": "1.4",
    "settings": {},
    "theme": "dark",
    "import": [],
    "resources": [],
    "styles": {},
    "onMount": [],
    "graphics": {},
    "commands": {},
    "layouts": {},
    "mainTemplate": {
      "parameters": [
        "payload"
      ],
      "items": [
        {
          "type": "Container",
          "direction": "row",
          "bind": [
            {
              "name": "token",
              "type": "number",
              "value": -1
            }
          ],
          "handleTick": [
            {
              "minimumDelay": 500,
              "commands": [
                {
                  "type": "SetValue",
                  "property": "token",
                  "value": "${(token + 1) % payload.currentView.properties.tokens.length}"
                }
              ]
            }
          ],
          "wrap": "wrap",
          "data": "${payload.currentView.properties.tokens}",
          "items": [
            {
              "color": "${index == token ? 'red' : 'white'}",
              "type": "Text",
              "spacing": "10dp",
              "text": "${data}"
            }
          ]
        }
      ]
    }
  },
  "datasources": {
    "currentView": {
      "type": "object",
      "properties": {
        "tokens": [
          "this",
          "is",
          "my",
          "red",
          "text"
        ]
      }
    }
  },
  "sources": {}
}