WebSockets: update JS client and demo

avoid hardcoded node name strings in mixer-demo
improve mixer-demo design
split ardour.js client into control and metadata mixins
rename JS client class Ardour to ArdourClient
JS client improve mixin implementation
JS client improve manifest parser
NO-OP whitespace and comments
NO-OP update websurface manifest versions
add Ardour icon in mixer-demo
improve mixer-demo scrolling on touch screens

1 files changed, 51 insertions, 0 deletions

diff --git a/share/web_surfaces/shared/metadata.js b/share/web_surfaces/shared/metadata.js
new file mode 100644
index 0000000000..888476c681
--- /dev/null
+++ b/share/web_surfaces/shared/metadata.js
@@ -0,0 +1,51 @@
+/*
+ * Copyright © 2020 Luciano Iam <lucianito@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+// Surface metadata API over HTTP
+
+export class MetadataMixin {
+
+	async getAvailableSurfaces () {
+		const response = await fetch('/surfaces.json');
+		
+		if (response.status == 200) {
+			return await response.json();
+		} else {
+			throw this._fetchResponseStatusError(response.status);
+		}
+	}
+
+	async getSurfaceManifest () {
+		const response = await fetch('manifest.xml');
+
+		if (response.status == 200) {
+			const manifest = {};
+			const xmlText = await response.text();
+			const xmlDoc = new DOMParser().parseFromString(xmlText, 'text/xml');
+			
+			for (const child of xmlDoc.children[0].children) {
+				manifest[child.tagName.toLowerCase()] = child.getAttribute('value');
+			}
+
+			return manifest;
+		} else {
+			throw this._fetchResponseStatusError(response.status);
+		}
+	}
+
+}