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Trackpad scrolling on Chromebook #514

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merged 1 commit into from Nov 13, 2020
Merged

Trackpad scrolling on Chromebook #514

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Trackpad scrolling on Chromebook 
Change-Id: Iaccda3e98cca17dbd9a2099293ccbc15e434d8f1
Signed-off-by: mert <mert.tumer@collabora.com>
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mert committed Nov 4, 2020
commit 4fcb14bb62c64f80c55c1be4a97971ba1f4ea320
43 changes: 43 additions & 0 deletions loleaflet/src/map/handler/Map.Scroll.js
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Expand Up @@ -17,13 +17,56 @@ L.Map.Scroll = L.Handler.extend({

this._delta = 0;
this._vertical = 1;
this.lastY = 0;
this.lastX = 0;

if (!this._map.touchGesture) {
L.DomEvent.on(this._map._container, {
touchstart: this._onTouchScrollStart,
touchmove: this._onTouchScroll,
}, this);
}
},

removeHooks: function () {
L.DomEvent.off(this._map._container, {
mousewheel: this._onWheelScroll,
MozMousePixelScroll: L.DomEvent.preventDefault
}, this);
if (!this._map.touchGesture) {
L.DomEvent.off(this._map._container, {
touchstart: this._onTouchScrollStart,
touchmove: this._onTouchScroll,
}, this);
}
},

_onTouchScrollStart: function (e) {
this.lastX = e.touches[0].clientX;
this.lastY = e.touches[0].clientY;
},

_onTouchScroll: function (e) {
var top = e.touches[0].clientY;
var start = e.touches[0].clientX;
var deltaX = (start - this.lastX);
var deltaY = (top - this.lastY);
var debounce = this._map.options.wheelDebounceTime;
if (!this._startTime) {
this._startTime = +new Date();
}
var left = Math.max(debounce - (+new Date() - this._startTime), 0);
clearTimeout(this._timer);

this.lastY = top;
if (Math.abs(deltaX) > Math.abs(deltaY)) {
this._vertical = 0;
this._delta += deltaX / 120;
} else {
this._delta += deltaY / 120;
this._vertical = 1;
}
this._timer = setTimeout(L.bind(this._performScroll, this), left);
},

_onWheelScroll: function (e) {
Expand Down