{
  "templates": {
    "circle_button": {
      "type": "text",
      "font_size": 40,
      "text_color": "#fff",
      "text_alignment_horizontal": "center",
      "text_alignment_vertical": "center",
      "border": {
        "corner_radius": 50
      },
      "width": {
        "type": "fixed",
        "value": 100
      },
      "height": {
        "type": "fixed",
        "value": 100
      },
      "background": [
        {
          "type": "solid",
          "$color": "bg_color"
        }
      ]
    }
  },
  "card": {
    "log_id": "main_screen",
    "variables": [
      {
        "type": "integer",
        "name": "count",
        "value": 0
      },
      {
        "type": "number",
        "name": "alpha",
        "value": 0.5
      }
    ],
    "states": [
      {
        "state_id": 0,
        "div": {
          "type": "container",
          "width": {
            "type": "match_parent"
          },
          "height": {
            "type": "match_parent"
          },
          "items": [
            {
              "type": "container",
              "width": {
                "type": "match_parent"
              },
              "height": {
                "type": "wrap_content"
              },
              "items": [
                {
                  "type": "text",
                  "font_size": 100,
                  "alpha": "@{min(1.0, max(alpha, 0.0))}",
                  "width": {
                    "type": "wrap_content",
                    "constrained": true
                  },
                  "text_alignment_horizontal": "center",
                  "alignment_horizontal": "center",
                  "alignment_vertical": "center",
                  "text": "@{count}"
                }
              ]
            },
            {
              "type": "container",
              "width": {
                "type": "match_parent"
              },
              "height": {
                "type": "wrap_content"
              },
              "alignment_horizontal": "left",
              "alignment_vertical": "bottom",
              "items": [
                {
                  "type": "circle_button",
                  "text": "−",
                  "bg_color": "#8c0000",
                  "actions": [
                    {
                      "log_id": "action_id",
                      "url": "div-action://set_variable?name=count&value=@{count - 1}"
                    },
                    {
                      "log_id": "action_id",
                      "url": "div-action://set_variable?name=alpha&value=@{alpha - 0.1}"
                    }
                  ]
                },
                {
                  "type": "container",
                  "width": {
                    "type": "fixed",
                    "value": 32
                  }
                },
                {
                  "type": "circle_button",
                  "text": "+",
                  "bg_color": "#038c00",
                  "actions": [
                    {
                      "log_id": "action_id",
                      "url": "div-action://set_variable?name=count&value=@{count + 1}"
                    },
                    {
                      "log_id": "action_id",
                      "url": "div-action://set_variable?name=alpha&value=@{alpha + 0.1}"
                    }
                  ]
                }
              ],
              "orientation": "horizontal",
              "content_alignment_horizontal": "center",
              "content_alignment_vertical": "center"
            }
          ],
          "content_alignment_horizontal": "center",
          "content_alignment_vertical": "center"
        }
      }
    ]
  }
}