From 18a63a6e7bee0bb556d38bfb9164ca0b00e888f9 Mon Sep 17 00:00:00 2001
From: Jakob Ketterl <jakob.ketterl@gmx.de>
Date: Sun, 19 Jan 2020 00:00:51 +0100
Subject: [PATCH] mousewheel tuning

---
 htdocs/lib/FrequencyDisplay.js | 58 ++++++++++++++++++++++++++++++++--
 htdocs/openwebrx.js            | 15 +++++----
 2 files changed, 65 insertions(+), 8 deletions(-)

diff --git a/htdocs/lib/FrequencyDisplay.js b/htdocs/lib/FrequencyDisplay.js
index 8943f81..0353fd8 100644
--- a/htdocs/lib/FrequencyDisplay.js
+++ b/htdocs/lib/FrequencyDisplay.js
@@ -1,7 +1,61 @@
 function FrequencyDisplay(element) {
     this.element = $(element);
+    this.digits = [];
+    this.digitContainer = $('<span>');
+    this.element.html([this.digitContainer, $('<span> MHz</span>')]);
+    this.decimalSeparator = (0.1).toLocaleString().substring(1, 2);
+    this.setFrequency(0);
 }
 
 FrequencyDisplay.prototype.setFrequency = function(freq) {
-    this.element.html((freq / 1e6).toLocaleString(undefined, {maximumFractionDigits: 4, minimumFractionDigits: 3}) + " MHz");
-}
\ No newline at end of file
+    this.frequency = freq;
+    var formatted = (freq / 1e6).toLocaleString(undefined, {maximumFractionDigits: 4, minimumFractionDigits: 4});
+    var children = this.digitContainer.children();
+    for (var i = 0; i < formatted.length; i++) {
+        if (!this.digits[i]) {
+            this.digits[i] = $('<span>');
+            var before = children[i];
+            if (before) {
+                $(before).after(this.digits[i]);
+            } else {
+                this.digitContainer.append(this.digits[i]);
+            }
+        }
+        this.digits[i][(isNaN(formatted[i]) ? 'remove' : 'add') + 'Class']('digit');
+        this.digits[i].html(formatted[i]);
+    }
+    while (this.digits.length > formatted.length) {
+        this.digits.pop().remove();
+    }
+};
+
+function TuneableFrequencyDisplay(element) {
+    FrequencyDisplay.call(this, element);
+    this.setupEvents();
+}
+
+TuneableFrequencyDisplay.prototype = new FrequencyDisplay();
+
+TuneableFrequencyDisplay.prototype.setupEvents = function() {
+    var me = this;
+    this.element.on('wheel', function(e){
+        e.preventDefault();
+        e.stopPropagation();
+
+        var index = me.digitContainer.find('.digit').index(e.target);
+        if (index < 0) return;
+
+        var delta = 10 ** (Math.floor(Math.log10(me.frequency)) - index);
+        if (e.originalEvent.deltaY > 0) delta *= -1;
+        var newFrequency = me.frequency + delta;
+
+        me.listeners.forEach(function(l) {
+            l(newFrequency);
+        });
+    });
+    this.listeners = [];
+};
+
+TuneableFrequencyDisplay.prototype.onFrequencyChange = function(listener){
+    this.listeners.push(listener);
+};
\ No newline at end of file
diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index f437a04..45112f8 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -565,7 +565,7 @@ function demodulator_analog_replace(subtype, for_digital) { //this function shou
     update_digitalvoice_panels("openwebrx-panel-metadata-" + subtype);
 }
 
-function demodulator_set_offset_frequency(which, to_what) {
+function demodulator_set_offset_frequency(to_what) {
     if (to_what > bandwidth / 2 || to_what < -bandwidth / 2) return;
     demodulators[0].offset_frequency = Math.round(to_what);
     demodulators[0].set();
@@ -588,9 +588,7 @@ var tunedFrequencyDisplay;
 var mouseFrequencyDisplay;
 
 function scale_setup() {
-    tunedFrequencyDisplay = new FrequencyDisplay($('#webrx-actual-freq'));
     tunedFrequencyDisplay.setFrequency(canvas_get_frequency(window.innerWidth / 2));
-    mouseFrequencyDisplay = new FrequencyDisplay($('#webrx-mouse-freq'));
     scale_canvas = e("openwebrx-scale-canvas");
     scale_ctx = scale_canvas.getContext("2d");
     scale_canvas.addEventListener("mousedown", scale_canvas_mousedown, false);
@@ -637,7 +635,7 @@ function scale_canvas_mousemove(evt) {
     else if (scale_canvas_drag_params.drag) {
         //call the drag_move for all demodulators (and they will decide if they're dragged)
         for (i = 0; i < demodulators.length; i++) event_handled |= demodulators[i].envelope.drag_move(evt.pageX);
-        if (!event_handled) demodulator_set_offset_frequency(0, scale_offset_freq_from_px(evt.pageX));
+        if (!event_handled) demodulator_set_offset_frequency(scale_offset_freq_from_px(evt.pageX));
     }
 
 }
@@ -653,7 +651,7 @@ function scale_canvas_end_drag(x) {
     scale_canvas_drag_params.mouse_down = false;
     var event_handled = false;
     for (var i = 0; i < demodulators.length; i++) event_handled |= demodulators[i].envelope.drag_end();
-    if (!event_handled) demodulator_set_offset_frequency(0, scale_offset_freq_from_px(x));
+    if (!event_handled) demodulator_set_offset_frequency(scale_offset_freq_from_px(x));
 }
 
 function scale_canvas_mouseup(evt) {
@@ -934,7 +932,7 @@ function canvas_mouseup(evt) {
     var relativeX = get_relative_x(evt);
 
     if (!canvas_drag) {
-        demodulator_set_offset_frequency(0, canvas_get_freq_offset(relativeX));
+        demodulator_set_offset_frequency(canvas_get_freq_offset(relativeX));
     }
     else {
         canvas_end_drag();
@@ -1792,6 +1790,11 @@ function openwebrx_init() {
     secondary_demod_init();
     digimodes_init();
     initPanels();
+    tunedFrequencyDisplay = new TuneableFrequencyDisplay($('#webrx-actual-freq'));
+    tunedFrequencyDisplay.onFrequencyChange(function(f) {
+        demodulator_set_offset_frequency(f - center_freq);
+    });
+    mouseFrequencyDisplay = new FrequencyDisplay($('#webrx-mouse-freq'));
     window.addEventListener("resize", openwebrx_resize);
     check_top_bar_congestion();
     init_header();