Update HTML/CSS/JS frontend

3 files changed, 390 insertions, 0 deletions

diff --git a/share/web_surfaces/builtin/mixer-demo/js/connection.js b/share/web_surfaces/builtin/mixer-demo/js/connection.js
new file mode 100644
index 0000000000..077799b48b
--- /dev/null
+++ b/share/web_surfaces/builtin/mixer-demo/js/connection.js
@@ -0,0 +1,77 @@
+/*
+ * 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 JSON_INF = 1.0e+128;
+
+class Connection {
+
+    // https://developer.mozilla.org/en-US/docs/Web/API/URL/host
+    
+    constructor (host) {
+        this.socket = new WebSocket(`ws://${host}`);
+        this.socket.onopen = () => this.openCallback();
+        this.socket.onclose = () => this.closeCallback();
+        this.socket.onerror = (error) => this.errorCallback(error);
+        this.socket.onmessage = (event) => this._onMessage(event);
+    }
+    
+    openCallback () {
+        // empty
+    }
+
+    closeCallback () {
+        // empty
+    }
+    
+    errorCallback (error) {
+        // empty
+    }
+
+    messageCallback (node, addr, val) {
+        // empty
+    }
+
+    send (node, addr, val) {
+        for (const i in val) {
+            if (val[i] == Infinity) {
+                val[i] = JSON_INF;
+            } else if (val[i] == -Infinity) {
+                val[i] = -JSON_INF;
+            }
+        }
+        
+        const json = JSON.stringify({node: node, addr: addr, val: val});
+
+        this.socket.send(json);
+    }
+
+    _onMessage (event) {
+        const msg = JSON.parse(event.data);
+
+        for (const i in msg.val) {
+            if (msg.val[i] >= JSON_INF) {
+                msg.val[i] = Infinity;
+            } else if (msg.val[i] <= -JSON_INF) {
+                msg.val[i] = -Infinity;
+            }
+        }
+
+        this.messageCallback(msg.node, msg.addr || [], msg.val);
+    }
+
+}
diff --git a/share/web_surfaces/builtin/mixer-demo/js/main.js b/share/web_surfaces/builtin/mixer-demo/js/main.js
new file mode 100644
index 0000000000..931371979a
--- /dev/null
+++ b/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;
+    }
+
+})();
diff --git a/share/web_surfaces/builtin/mixer-demo/js/widget.js b/share/web_surfaces/builtin/mixer-demo/js/widget.js
new file mode 100644
index 0000000000..7bab5b1b1a
--- /dev/null
+++ b/share/web_surfaces/builtin/mixer-demo/js/widget.js
@@ -0,0 +1,157 @@
+/*
+ * 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.
+ */
+
+class Widget {
+
+    constructor (node, addr, html) {
+        this.node = node;
+        this.addr = addr;
+        const template = document.createElement('template');
+        template.innerHTML = html;
+        this.el = template.content.firstChild;
+    }
+
+    attach (parent, callback) {
+        parent.appendChild(this.el);
+
+        if (callback) {
+            this.callback = callback;
+        }
+    }
+
+    callback (value) {
+        // do nothing by default
+    }
+
+    get hash () {
+        return [this.node, this.addr];
+    }
+
+}
+
+class Switch extends Widget {
+
+    constructor (node, addr) {
+        super (node, addr, `<input type="checkbox" class="widget-switch">`);
+        this.el.addEventListener('input', (ev) => this.callback(this.value));
+    }
+
+    get value () {
+        return this.el.checked;
+    }
+
+    set value (val) {
+        this.el.checked = val;
+    }
+     
+}
+
+class Slider extends Widget {
+
+    constructor (node, addr, min, max, step) {
+        const html = `<input type="range" class="widget-slider"
+            min="${min}" max="${max}" step="${step}">`;
+        super(node, addr, html);
+        this.min = min;
+        this.max = max;
+        this.el.addEventListener('input', (ev) => this.callback(this.value));
+    }
+
+    get value () {
+        return parseFloat(this.el.value)
+    }
+
+    set value (val) {
+        this.el.value = val;
+    }
+
+}
+
+class DiscreteSlider extends Slider {
+
+    constructor (node, addr, min, max) {
+        super(node, addr, min, max, 1);
+    }
+
+}
+
+class ContinuousSlider extends Slider {
+
+    constructor (node, addr, min, max) {
+        super(node, addr, min, max, 0.001);
+    }
+
+}
+
+class LogarithmicSlider extends ContinuousSlider {
+
+    constructor (node, addr, min, max) {
+        super(node, addr, 0, 1.0);
+        this.minVal = Math.log(min);
+        this.maxVal = Math.log(max);
+        this.scale = this.maxVal - this.minVal;
+    }
+
+    get value () {
+        return Math.exp(this.minVal + this.scale * super.value);
+    }
+
+    set value (val) {
+        this.el.value = (Math.log(val) - this.minVal) / this.scale;
+    }
+
+}
+
+class StripPanSlider extends ContinuousSlider {
+
+    constructor (node, addr) {
+        super(node, addr, -1.0, 1.0);
+    }
+
+}
+
+class StripGainSlider extends ContinuousSlider {
+
+    constructor (node, addr) {
+        super(node, addr, 0, 1.0)
+        this.minVal = -58.0;
+        this.maxVal = 6.0;
+        this.scale = (this.maxVal - this.minVal);
+    }
+
+    get value () {
+        return this.maxVal + Math.log10(super.value) * this.scale;
+    }
+
+    set value (val) {
+        this.el.value = Math.pow(10.0, (val - this.maxVal) / this.scale);
+    }
+
+}
+
+class StripMeter extends Widget {
+
+    constructor (node, addr) {
+        super(node, addr, `<label></label>`);
+    }
+
+    set value (val) {
+        this.el.innerHTML = val == -Infinity ? '-∞' : `${Math.round(val)} dB`;
+    }
+
+}