Add assets

assets/default/default.html

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+<div id="app"></div>

assets/default/wails.js

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+// Wails runtime JS
+
+(function () {
+	window.wails = window.wails || {
+		$: {}
+	};
+
+	/****************** Utility Functions ************************/
+
+	// -------------- Random --------------
+	// AwesomeRandom
+	function cryptoRandom() {
+		var array = new Uint32Array(1);
+		return window.crypto.getRandomValues(array)[0];
+	}
+
+	// LOLRandom
+	function basicRandom() {
+		return Math.random() * 9007199254740991;
+	}
+
+	// Pick one based on browser capability
+	var randomFunc;
+	if (window.crypto) {
+		randomFunc = cryptoRandom;
+	} else {
+		randomFunc = basicRandom;
+	}
+
+	// -------------- Identifiers ---------------
+
+	function isValidIdentifier(name) {
+		// Don't xss yourself :-)
+		try {
+			new Function("var " + name);
+			return true
+		} catch (e) {
+			return false
+		}
+	}
+
+	// -------------- JS ----------------
+	function addScript(js, callbackID) {
+		console.log("Adding script: " + js)
+		var script = document.createElement("script");
+		script.text = js;
+		document.body.appendChild(script);
+		console.log("Calling back with:" + callbackID);
+		window.wails.events.emit(callbackID);
+	}
+
+	// -------------- CSS ---------------
+	// Adapted from webview - thanks zserge!
+	function injectCSS(css) {
+		var elem = document.createElement('style');
+		elem.setAttribute('type', 'text/css');
+		if (elem.styleSheet) {
+			elem.styleSheet.cssText = css;
+		} else {
+			elem.appendChild(document.createTextNode(css));
+		}
+		var head = document.head || document.getElementsByTagName('head')[0];
+		head.appendChild(elem)
+	}
+
+	/************************* Bindings *************************/
+
+	var bindingsBasePath = window.wails.$;
+
+	// Creates the path given in the bindings path
+	function addBindingPath(pathSections) {
+		// Start at the base path
+		var currentPath = bindingsBasePath
+		// for each section of the given path
+		for (var section of pathSections) {
+
+			// Is section a valid javascript identifier?
+			if (!isValidIdentifier(section)) {
+				var errMessage = section + " is not a valid javascript identifier."
+				var err = new Error(errMessage)
+				return [null, err]
+			}
+
+			// Add if doesn't exist
+			if (!currentPath[section]) {
+				currentPath[section] = {}
+			}
+			// update current path to new path
+			currentPath = currentPath[section]
+		}
+		return [currentPath, null]
+	}
+
+	function newBinding(bindingName) {
+
+		// Get all the sections of the binding
+		var bindingSections = bindingName.split('.');
+
+		// Get the actual function/method call name
+		var callName = bindingSections.pop();
+
+		// Add path to binding
+		[pathToBinding, err] = addBindingPath(bindingSections)
+
+		if (err != null) {
+			// We need to return an error
+			return err
+		}
+
+		// Add binding call
+		pathToBinding[callName] = function () {
+
+			// No timeout by default
+			var timeout = 0;
+
+			// Actual function
+			function dynamic() {
+				var args = [].slice.call(arguments)
+				return call(bindingName, args, timeout);
+			}
+
+			// Allow setting timeout to function
+			dynamic.setTimeout = function (newTimeout) {
+				timeout = newTimeout;
+			}
+
+			// Allow getting timeout to function
+			dynamic.getTimeout = function () {
+				return timeout;
+			}
+
+			return dynamic;
+		}();
+	}
+
+	/************************************************************/
+
+	/*************************** Calls **************************/
+
+	var callbacks = {};
+
+	// Call sends a message to the backend to call the binding with the
+	// given data. A promise is returned and will be completed when the
+	// backend responds. This will be resolved when the call was successful
+	// or rejected if an error is passed back.
+	// There is a timeout mechanism. If the call doesn't respond in the given
+	// time (in milliseconds) then the promise is rejected.
+
+	function call(bindingName, data, timeout) {
+
+		// Timeout infinite by default
+		if (timeout == null || timeout == undefined) {
+			timeout = 0;
+		}
+
+		// Create a promise
+		return new Promise(function (resolve, reject) {
+
+			// Create a unique callbackID
+			var callbackID;
+			do {
+				callbackID = bindingName + "-" + randomFunc();
+			} while (callbacks[callbackID])
+
+			// Set timeout
+			if (timeout > 0) {
+				var timeoutHandle = setTimeout(function () {
+					reject(Error("Call to " + bindingName + " timed out. Request ID: " + callbackID))
+				}, timeout);
+			}
+
+			// Store callback
+			callbacks[callbackID] = {
+				timeoutHandle: timeoutHandle,
+				reject: reject,
+				resolve: resolve
+			}
+			try {
+				var payloaddata = JSON.stringify(data)
+				// Create the message
+				message = {
+					type: "call",
+					callbackid: callbackID,
+					payload: {
+						bindingName: bindingName,
+						data: payloaddata,
+					}
+				}
+
+				// Make the call
+				var payload = JSON.stringify(message)
+				external.invoke(payload);
+			} catch (e) {
+				console.error(e)
+			}
+		})
+	}
+
+
+	// Called by the backend to return data to a previously called
+	// binding invocation
+	function callback(incomingMessage) {
+		// Parse the message
+		var message
+		try {
+			message = JSON.parse(incomingMessage)
+		} catch (e) {
+			wails.log.debug("Invalid JSON passed to callback: " + e.message)
+			wails.log.debug("Message: " + incomingMessage)
+			return
+		}
+		callbackID = message.callbackid
+		callbackData = callbacks[callbackID]
+		if (!callbackData) {
+			console.error("Callback '" + callbackID + "' not registed!!!")
+			return
+		}
+		clearTimeout(callbackData.timeoutHandle)
+		delete callbacks[callbackID]
+		if (message.error) {
+			return callbackData.reject(message.error)
+		}
+		return callbackData.resolve(message.data)
+	}
+
+	/************************************************************/
+
+
+	/************************** Events **************************/
+
+	var eventListeners = {};
+
+	// Registers event listeners
+	function on(eventName, callback) {
+		eventListeners[eventName] = eventListeners[eventName] || [];
+		eventListeners[eventName].push(callback);
+	}
+
+	// notify informs frontend listeners that an event was emitted with the given data
+	function notify(eventName, data) {
+		if (eventListeners[eventName]) {
+			eventListeners[eventName].forEach(element => {
+				var parsedData = []
+				// Parse data if we have it
+				if (data) {
+					try {
+						parsedData = JSON.parse(data);
+					} catch (e) {
+						wails.log.error("Invalid JSON data sent to notify. Event name = " + eventName)
+					}
+				}
+				element.apply(null, parsedData);
+			});
+		}
+	}
+
+	// emit an event with the given name and data
+	function emit(eventName) {
+
+		// Calculate the data
+		var data = JSON.stringify([].slice.apply(arguments).slice(1));
+
+		// Notify backend
+		message = {
+			type: "event",
+			payload: {
+				name: eventName,
+				data: data,
+			}
+		}
+		external.invoke(JSON.stringify(message));
+	}
+
+	// Events calls
+	window.wails.events = { emit: emit, on: on };
+
+	/************************************************************/
+
+	/************************* Logging **************************/
+
+	// Sends a log message to the backend with the given
+	// level + message
+	function sendLogMessage(level, message) {
+
+		// Log Message
+		message = {
+			type: "log",
+			payload: {
+				level: level,
+				message: message,
+			}
+		}
+		external.invoke(JSON.stringify(message));
+	}
+
+	function logDebug(message) {
+		sendLogMessage("debug", message);
+	}
+	function logInfo(message) {
+		sendLogMessage("info", message);
+	}
+	function logWarning(message) {
+		sendLogMessage("warning", message);
+	}
+	function logError(message) {
+		sendLogMessage("error", message);
+	}
+	function logFatal(message) {
+		sendLogMessage("fatal", message);
+	}
+
+	window.wails.log = {
+		debug: logDebug,
+		info: logInfo,
+		warning: logWarning,
+		error: logError,
+		fatal: logFatal,
+	};
+
+	/************************** Exports *************************/
+
+	window.wails._ = {
+		newBinding: newBinding,
+		callback: callback,
+		notify: notify,
+		sendLogMessage: sendLogMessage,
+		callbacks: callbacks,
+		injectCSS: injectCSS,
+		addScript: addScript,
+	}
+
+	/************************************************************/
+
+	// Notify backend that the runtime has finished loading
+	window.wails.events.emit("wails:loaded");
+
+})()

assets/headless/index.html

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+<html>
+
+<head>
+  <title>Wails Headless</title>
+  <style>
+    .wails-reconnect-overlay {
+      position: fixed;
+      top: 0;
+      left: 0;
+      width: 100%;
+      height: 100%;
+      background: rgba(0, 0, 0, 0.6);
+      font-family: sans-serif;
+      display: none;
+      z-index: 999999;
+    }
+
+    .wails-reconnect-overlay-content {
+      padding: 20px 30px;
+      text-align: center;
+      width: 20em;
+      position: relative;
+      height: 17em;
+      border-radius: 1em;
+      margin: 5% auto 0;
+      background-color: white;
+      box-shadow: 1px 1px 20px 3px;
+      background-image: url("data:image/png;base64,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");
+      background-repeat: no-repeat;
+      background-position: center;
+    }
+
+    .wails-reconnect-overlay-title {
+      font-size: 2em;
+    }
+
+    .wails-reconnect-overlay-message {
+      font-size: 1.3em;
+    }
+
+    /* https://codepen.io/EastingAndNorthing/pen/aNWrZz - Cheers Mark! */
+
+    .wails-reconnect-overlay-loadingspinner {
+      pointer-events: none;
+      width: 2.5em;
+      height: 2.5em;
+      border: 0.4em solid transparent;
+      border-color: #eee;
+      border-top-color: #3E67EC;
+      border-radius: 50%;
+      animation: loadingspin 1s linear infinite;
+      margin: auto;
+      padding: 2.5em;
+    }
+
+    @keyframes loadingspin {
+      100% {
+        transform: rotate(360deg)
+      }
+    }
+  </style>
+</head>
+
+<body>
+  <div class="wails-reconnect-overlay">
+    <div class="wails-reconnect-overlay-content">
+      <div class="wails-reconnect-overlay-title">Disconnected</div><br>
+      <div class="wails-reconnect-overlay-loadingspinner"></div><br>
+      <div class="wails-reconnect-overlay-message">Waiting for backend</div>
+    </div>
+  </div>
+
+  <div id="app"></div>
+
+  <script id="wails-headless-runtime">
+    (function () {
+
+      var websocket = null;
+      var connectTimer = null;
+      var reconnectOverlay = document.querySelector(".wails-reconnect-overlay");
+      var connectionState = "disconnected";
+
+      function showReconnectOverlay() {
+        reconnectOverlay.style.display = 'block';
+      }
+
+      function hideReconnectOverlay() {
+        reconnectOverlay.style.display = 'none';
+      }
+
+      window.external = {
+        invoke: function (msg) {
+          websocket.send(msg);
+        }
+      };
+
+      function addScript(script, id) {
+        var s = document.createElement("script")
+        if (id) {
+          s.id = id;
+        }
+        s.textContent = script;
+        document.head.appendChild(s)
+      }
+
+      function handleConnect() {
+        console.log("[Wails] Connected to backend");
+        addKeyListener();
+        hideReconnectOverlay();
+        clearInterval(connectTimer);
+        websocket.onclose = handleDisconnect;
+        websocket.onmessage = handleMessage;
+        connectionState = "connected";
+        // websocket.onerror = function () { }
+      }
+
+      function handleDisconnect() {
+        console.log("[Wails] Disconnected from backend");
+        websocket = null;
+        removeKeyListener();
+        connectionState = "disconnected";
+        showReconnectOverlay();
+        connect();
+      }
+
+      function connect() {
+        connectTimer = setInterval(function () {
+          if (websocket == null) {
+            websocket = new WebSocket("ws://localhost:34115/ws")
+            websocket.onopen = handleConnect;
+            websocket.onerror = function (e) {
+              e.stopImmediatePropagation();
+              e.stopPropagation();
+              e.preventDefault();
+              websocket = null;
+              return false
+            }
+          }
+        }, 300);
+      }
+
+      function handleMessage(e) {
+        addScript(e.data);
+      }
+
+      // Key listener
+      var delta = 300;
+      var lastKeypressTime = 0;
+      function KeyHandler(event) {
+        if (event.key === "`") {
+          var thisKeypressTime = new Date();
+          if (thisKeypressTime - lastKeypressTime <= delta) {
+            console.log("Double tap!")
+            // optional - if we'd rather not detect a triple-press
+            // as a second double-press, reset the timestamp
+            thisKeypressTime = 0;
+          }
+          lastKeypressTime = thisKeypressTime;
+        }
+      }
+
+      function addKeyListener() {
+        document.body.addEventListener('keydown', KeyHandler);
+      }
+
+      function removeKeyListener() {
+        document.body.removeEventListener('keydown', KeyHandler);
+      }
+
+      connect();
+
+
+    }());
+
+  </script>
+
+</body>
+
+</html>