release keys when window loosing focus

kvmd/web/js/hid.js

@@ -2,11 +2,19 @@ var hid = new function() {
 	var __install_timer = null;
 	var __installed = false;
 
+	var __hidden_attr = null;
+	var __visibility_change_attr = null;
+
 	this.init = function() {
 		keyboard.init();
 		mouse.init();
 	}
 
+	this.releaseAll = function() {
+		keyboard.releaseAll();
+		mouse.releaseAll();
+	};
+
 	this.emitShortcut = function(...codes) {
 		console.log(codes);
 		var delay = 0;

kvmd/web/js/keyboard.js

@@ -24,13 +24,17 @@ var keyboard = new function() {
 	};
 
 	this.setSocket = function(ws) {
+		keyboard.releaseAll();
+		__ws = ws;
+		$("hid-keyboard-led").className = (ws ? "led-on" : "led-off");
+	};
+
+	this.releaseAll = function(ws) {
 		__keys.concat(__modifiers).forEach(function(el_key) {
 			if (__isActive(el_key)) {
 				keyboard.fireEvent(el_key.id, false);
 			}
 		});
-		__ws = ws;
-		$("hid-keyboard-led").className = (ws ? "led-on" : "led-off");
 	};
 
 	this.fireEvent = function(code, state) {

kvmd/web/js/ui.js

@@ -12,6 +12,32 @@ var ui = new function() {
 			var el_header = el_window.querySelector(".window-header");
 			__makeWindowMovable(el_header, el_window);
 		});
+
+		if (typeof document.hidden !== "undefined") {
+			__hidden_attr = "hidden";
+			__visibility_change_attr = "visibilitychange";
+		} else if (typeof document.webkitHidden !== "undefined") {
+			__hidden_attr = "webkitHidden";
+			__visibility_change_attr = "webkitvisibilitychange";
+		} else if (typeof document.mozHidden !== "undefined") {
+			__hidden_attr = "mozHidden";
+			__visibility_change_attr = "mozvisibilitychange";
+		}
+
+		if (__visibility_change_attr) {
+			document.addEventListener(
+				__visibility_change_attr,
+				function() {
+					if (document[__hidden_attr]) {
+						hid.releaseAll();
+					}
+				},
+				false,
+			);
+		}
+
+		window.onpagehide = hid.releaseAll;
+		window.onblur = hid.releaseAll;
 	};
 
 	var __toggleMenu = function(el_a) {