Add UI api

assets/init.js

@@ -498,6 +498,7 @@ let Network = {
  * @param url {string}
  * @param options {{method: string, headers: Object, body: any}}
  * @returns {Promise<{ok: boolean, status: number, statusText: string, headers: {}, arrayBuffer: (function(): Promise<ArrayBuffer>), text: (function(): Promise<string>), json: (function(): Promise<any>)}>}
+ * @since 1.2.0
  */
 async function fetch(url, options) {
     let method = 'GET';
@@ -1203,3 +1204,45 @@ class Image {
         return new Image(key);
     }
 }
+
+let UI = {
+    /**
+     * Show a message
+     * @param message {string}
+     */
+    showMessage: (message) => {
+        sendMessage({
+            method: 'UI',
+            function: 'showMessage',
+            message: message,
+        })
+    },
+
+    /**
+     * Show a dialog. Any action will close the dialog.
+     * @param title {string}
+     * @param content {string}
+     * @param actions {{text:string, callback: () => void}[]}
+     */
+    showDialog: (title, content, actions) => {
+        sendMessage({
+            method: 'UI',
+            function: 'showDialog',
+            title: title,
+            content: content,
+            actions: actions,
+        })
+    },
+
+    /**
+     * Open [url] in external browser
+     * @param url {string}
+     */
+    launchUrl: (url) => {
+        sendMessage({
+            method: 'UI',
+            function: 'launchUrl',
+            url: url,
+        })
+    },
+}