Update HTML/CSS/JS frontend

share/web_surfaces/builtin/mixer-demo/js/main.js

@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 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.
+ */
+
+(() => {
+
+    const MAX_LOG_LINES = 1000;
+    const FEEDBACK_NODES = ['strip_gain', 'strip_pan', 'strip_meter', 'strip_plugin_enable',
+        'strip_plugin_param_value'];
+    
+    const conn = new Connection(location.host);
+    const widgets = {};
+
+    conn.messageCallback = (node, addr, val) => {
+        log(`↙ ${node} (${addr}) = ${val}`, 'message-in');
+
+        if (node == 'strip_desc') {
+            createStrip (addr, ...val);
+        } else if (node == 'strip_plugin_desc') {
+            createStripPlugin (addr, ...val);
+        } else if (node == 'strip_plugin_param_desc') {
+            createStripPluginParam (addr, ...val);
+        } else if (FEEDBACK_NODES.includes(node)) {
+            if (widgets[[node, addr]]) {
+                widgets[[node, addr]].value = val[0];
+            }
+        }
+    };
+
+    conn.closeCallback = () => {
+        log('Connection dropped', 'error');
+    };
+
+    conn.errorCallback = () => {
+        log('Connection error', 'error');
+    };
+
+    function createStrip (addr, name) {
+        const id = `strip-${addr[0]}`;
+        const strips = document.getElementById('strips');
+        const div = createElem(`<div class="strip" id="${id}"></div>`, strips);
+        createElem(`<label class="comp-name" for="${id}">∿&emsp;&emsp;${name}</label>`, div);
+        
+        // meter
+        const meter = new StripMeter('strip_meter', addr);
+        meter.el.classList.add('slider-meter');
+        meter.attach(div);
+        register(meter);
+
+        // gain
+        let holder = createElem(`<div class="strip-slider"></div>`, div); 
+        createElem(`<label>Gain</label>`, holder);
+        const gain = new StripGainSlider('strip_gain', addr);
+        gain.attach(holder, (val) => send(gain));
+        register(gain);
+
+        // pan
+        holder = createElem(`<div class="strip-slider"></div>`, div); 
+        createElem(`<label>Pan</label>`, holder);
+        const pan = new StripPanSlider('strip_pan', addr);
+        pan.attach(holder, (val) => send(pan));
+        register(pan);
+    }
+
+    function createStripPlugin (addr, name) {
+        const strip = document.getElementById(`strip-${addr[0]}`);
+        const id = `plugin-${addr[0]}-${addr[1]}`;
+        const div = createElem(`<div class="plugin" id="${id}"></div>`, strip);
+        createElem(`<label class="comp-name">⨍&emsp;&emsp;${name}</label>`, div);
+        const enable = new Switch('strip_plugin_enable', addr);
+        enable.el.classList.add('plugin-enable');
+        enable.attach(div, (val) => send(enable));
+        register(enable);
+    }
+
+    function createStripPluginParam (addr, name, data_type, min, max, is_log) {
+        let param, clazz;
+
+        if (data_type == 'b') {
+            clazz = 'boolean';
+            param = new Switch('strip_plugin_param_value', addr);
+        } else if (data_type == 'i') {
+            clazz = 'discrete';
+            param = new DiscreteSlider('strip_plugin_param_value', addr, min, max);
+        } else if (data_type == 'd') {
+            clazz = 'continuous';
+            if (is_log) {
+                param = new LogarithmicSlider('strip_plugin_param_value', addr, min, max);
+            } else {
+                param = new ContinuousSlider('strip_plugin_param_value', addr, min, max);
+            }
+        }
+
+        const plugin = document.getElementById(`plugin-${addr[0]}-${addr[1]}`);
+        const id = `param-${addr[0]}-${addr[1]}-${addr[2]}`;
+        const div = createElem(`<div class="plugin-param ${clazz}" id="${id}"></div>`, plugin);
+        createElem(`<label for="${id}">${name}</label>`, div);
+
+        param.attach(div, (val) => send(param));
+        param.el.name = id;
+        register(param);
+    }
+
+    function send (widget) {
+        const val = widget.value;
+        log(`↗ ${widget.node} (${widget.addr}) = ${val}`, 'message-out');
+        conn.send(widget.node, widget.addr, [val]);
+    }
+
+    function createElem (html, parent) {
+        const t = document.createElement('template');
+        t.innerHTML = html;
+        
+        const elem = t.content.firstChild;
+        
+        if (parent) {
+            parent.appendChild(elem);
+        }
+
+        return elem;
+    }
+
+    function register (widget) {
+        widgets[widget.hash] = widget;
+    }
+
+    function log (message, className) {
+        const output = document.getElementById('log');
+
+        if (output.childElementCount > MAX_LOG_LINES) {
+            output.removeChild(output.childNodes[0]);
+        }
+
+        const pre = document.createElement('pre');
+        pre.innerHTML = message;
+        pre.className = className;
+
+        output.appendChild(pre);
+        output.scrollTop = output.scrollHeight;
+    }
+
+})();