From 891c63fe892b59fcf5a5579191ea844fad9f9d07 Mon Sep 17 00:00:00 2001
From: Luciano Iam <lucianito@gmail.com>
Date: Thu, 9 Apr 2020 16:34:16 +0200
Subject: Update HTML/CSS/JS frontend

---
 share/web_surfaces/builtin/mixer-demo/js/widget.js | 157 +++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 share/web_surfaces/builtin/mixer-demo/js/widget.js

(limited to 'share/web_surfaces/builtin/mixer-demo/js/widget.js')

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`;
+    }
+
+}
-- 
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