Merge pull request #350 from 2gis/fix/unwanted-inertia-movement

fix unwanted inertia movement

gulp/deps/deps.js

@@ -83,6 +83,7 @@ var deps = {
             'DGCustomization/src/DGMap.js',
             'DGCustomization/src/DGMap.BaseLayer.js',
             'DGCustomization/src/DGMap.TilesCheck.js',
+            'DGCustomization/src/DGMap.Drag.js',
             'DGCustomization/src/DGMarker.js'
         ],
         less: {

src/DGCustomization/src/DGMap.Drag.js

@@ -0,0 +1,40 @@
+/**
+ * This customization fixes unwanted inertia movement after sudden drag stops
+ * See https://github.com/Leaflet/Leaflet/pull/4048.
+ * If this PR ever gets merged, this file can be removed.
+ */
+var onDragEnd = DG.Map.Drag.prototype._onDragEnd;
+
+DG.Map.Drag.include({
+    _rememberTimeAndPosition: function () {
+        var time = this._lastTime = +new Date(),
+            pos = this._lastPos = this._draggable._absPos || this._draggable._newPos;
+
+        this._positions.push(pos);
+        this._times.push(time);
+
+        // Remove all data points older than 50 ms
+        while (time - this._times[0] > 50) {
+            this._positions.shift();
+            this._times.shift();
+        }
+    },
+
+    _onDrag: function (e) {
+        if (this._map.options.inertia) {
+            this._rememberTimeAndPosition();
+        }
+
+        this._map
+            .fire('move', e)
+            .fire('drag', e);
+    },
+
+    _onDragEnd: function () {
+        if (this._map.options.inertia && !DG.Browser.touch) {
+            this._rememberTimeAndPosition();
+        }
+
+        onDragEnd.call(this);
+    }
+});