Allow preventDefault for dblclick and fix touch zoom/rotate

src/ui/bind_handlers.js

@@ -18,7 +18,6 @@ module.exports = function bindHandlers(map: Map, options: {}) {
     const el = map.getCanvasContainer();
     let contextMenuEvent = null;
     let mouseDown = false;
-    let tapped = null;
 
     for (const name in handlers) {
         (map: any)[name] = new handlers[name](map, options);
@@ -105,19 +104,9 @@ module.exports = function bindHandlers(map: Map, options: {}) {
 
         map.stop();
 
-        if (!e.touches || e.touches.length > 1) return;
-
-        if (!tapped) {
-            tapped = setTimeout(onTouchTimeout, 300);
-
-        } else {
-            clearTimeout(tapped);
-            tapped = null;
-            fireMouseEvent('dblclick', (e: any));
-        }
-
         map.dragPan.onDown(e);
         map.touchZoomRotate.onStart(e);
+        map.doubleClickZoom.onTouchStart(mapEvent);
     }
 
     function onTouchMove(e: TouchEvent) {
@@ -132,17 +121,19 @@ module.exports = function bindHandlers(map: Map, options: {}) {
         fireTouchEvent('touchcancel', e);
     }
 
-    function onTouchTimeout() {
-        tapped = null;
-    }
-
     function onClick(e: MouseEvent) {
         fireMouseEvent('click', e);
     }
 
     function onDblClick(e: MouseEvent) {
-        fireMouseEvent('dblclick', e);
-        e.preventDefault();
+        const mapEvent = new MapMouseEvent('dblclick', map, e);
+        map.fire(mapEvent);
+
+        if (mapEvent.defaultPrevented) {
+            return;
+        }
+
+        map.doubleClickZoom.onDblClick(mapEvent);
     }
 
     function onContextMenu(e: MouseEvent) {

src/ui/events.js

@@ -57,6 +57,8 @@ class MapMouseEvent extends Event {
      *   * On `mousedown` events, the behavior of {@link DragPanHandler}
      *   * On `mousedown` events, the behavior of {@link DragRotateHandler}
      *   * On `mousedown` events, the behavior of {@link BoxZoomHandler}
+     *   * On `dblclick` events, the behavior of {@link DoubleClickZoomHandler}
+     *
      */
     preventDefault() {
         this._defaultPrevented = true;
@@ -134,6 +136,7 @@ class MapTouchEvent extends Event {
      *
      *   * On `touchstart` events, the behavior of {@link DragPanHandler}
      *   * On `touchstart` events, the behavior of {@link TouchZoomRotateHandler}
+     *
      */
     preventDefault() {
         this._defaultPrevented = true;

src/ui/handler/dblclick_zoom.js

@@ -3,15 +3,17 @@
 const util = require('../../util/util');
 
 import type Map from '../map';
+import type {MapMouseEvent, MapTouchEvent} from '../events';
 
 /**
  * The `DoubleClickZoomHandler` allows the user to zoom the map at a point by
- * double clicking.
+ * double clicking or double tapping.
  */
 class DoubleClickZoomHandler {
     _map: Map;
     _enabled: boolean;
     _active: boolean;
+    _tapped: ?number;
 
     /**
      * @private
@@ -51,7 +53,6 @@ class DoubleClickZoomHandler {
      */
     enable() {
         if (this.isEnabled()) return;
-        this._map.on('dblclick', this._onDblClick);
         this._enabled = true;
     }
 
@@ -63,11 +64,29 @@ class DoubleClickZoomHandler {
      */
     disable() {
         if (!this.isEnabled()) return;
-        this._map.off('dblclick', this._onDblClick);
         this._enabled = false;
     }
 
-    _onDblClick(e: any) {
+    onTouchStart(e: MapTouchEvent) {
+        if (!this.isEnabled()) return;
+        if (e.points.length > 1) return;
+
+        if (!this._tapped) {
+            this._tapped = setTimeout(() => { this._tapped = null; }, 300);
+        } else {
+            clearTimeout(this._tapped);
+            this._tapped = null;
+            this._zoom(e);
+        }
+    }
+
+    onDblClick(e: MapMouseEvent) {
+        if (!this.isEnabled()) return;
+        e.originalEvent.preventDefault();
+        this._zoom(e);
+    }
+
+    _zoom(e: MapMouseEvent | MapTouchEvent) {
         this._active = true;
         this._map.on('zoomend', this._onZoomEnd);
         this._map.zoomTo(

test/unit/ui/handler/dblclick_zoom.test.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const test = require('mapbox-gl-js-test').test;
+const window = require('../../../../src/util/window');
+const Map = require('../../../../src/ui/map');
+const DOM = require('../../../../src/util/dom');
+const simulate = require('mapbox-gl-js-test/simulate_interaction');
+
+function createMap() {
+    return new Map({ container: DOM.create('div', '', window.document.body) });
+}
+
+test('DoubleClickZoomHandler does not zoom if preventDefault is called on the dblclick event', (t) => {
+    const map = createMap();
+
+    map.on('dblclick', e => e.preventDefault());
+
+    const zoom = t.spy();
+    map.on('zoom', zoom);
+
+    simulate.dblclick(map.getCanvas());
+
+    t.equal(zoom.callCount, 0);
+
+    map.remove();
+    t.end();
+});