Merge pull request #1285 from LLK/feature/device-connection

Device connection update for micro:bit and EV3 extensions

src/engine/runtime.js

@@ -254,6 +254,8 @@ class Runtime extends EventEmitter {
             video: new Video(this)
         };
 
+        this.extensionDevices = {};
+
         /**
          * A runtime profiler that records timed events for later playback to
          * diagnose Scratch performance.
@@ -394,6 +396,30 @@ class Runtime extends EventEmitter {
         return 'EXTENSION_ADDED';
     }
 
+    /**
+     * Event name for updating the available set of peripheral devices.
+     * @const {string}
+     */
+    static get PERIPHERAL_LIST_UPDATE () {
+        return 'PERIPHERAL_LIST_UPDATE';
+    }
+
+    /**
+     * Event name for reporting that a peripheral has connected.
+     * @const {string}
+     */
+    static get PERIPHERAL_CONNECTED () {
+        return 'PERIPHERAL_CONNECTED';
+    }
+
+    /**
+     * Event name for reporting that a peripheral has encountered an error.
+     * @const {string}
+     */
+    static get PERIPHERAL_ERROR () {
+        return 'PERIPHERAL_ERROR';
+    }
+
     /**
      * Event name for reporting that blocksInfo was updated.
      * @const {string}
@@ -867,6 +893,36 @@ class Runtime extends EventEmitter {
             (result, categoryInfo) => result.concat(categoryInfo.blocks.map(blockInfo => blockInfo.json)), []);
     }
 
+    registerExtensionDevice (extensionId, device) {
+        this.extensionDevices[extensionId] = device;
+    }
+
+    startDeviceScan (extensionId) {
+        if (this.extensionDevices[extensionId]) {
+            this.extensionDevices[extensionId].startDeviceScan();
+        }
+    }
+
+    connectToPeripheral (extensionId, peripheralId) {
+        if (this.extensionDevices[extensionId]) {
+            this.extensionDevices[extensionId].connectDevice(peripheralId);
+        }
+    }
+
+    disconnectExtensionSession (extensionId) {
+        if (this.extensionDevices[extensionId]) {
+            this.extensionDevices[extensionId].disconnectSession();
+        }
+    }
+
+    getPeripheralIsConnected (extensionId) {
+        let isConnected = false;
+        if (this.extensionDevices[extensionId]) {
+            isConnected = this.extensionDevices[extensionId].getPeripheralIsConnected();
+        }
+        return isConnected;
+    }
+
     /**
      * Retrieve the function associated with the given opcode.
      * @param {!string} opcode The opcode to look up.