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Add layerId parameter to once event handler (mapbox#8875)
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@malwoodsantoro
malwoodsantoro authored and Anjana Sofia Vakil committed Jan 7, 2020
1 parent 33811a4 commit 5203d43
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Showing 2 changed files with 101 additions and 50 deletions.
149 changes: 100 additions & 49 deletions src/ui/map.js
View file
Expand Up @@ -855,6 +855,54 @@ class Map extends Camera {
this.dragRotate.isActive();
}

_createDelegatedListener(type: MapEvent, layerId: any, listener: any) {
if (type === 'mouseenter' || type === 'mouseover') {
let mousein = false;
const mousemove = (e) => {
const features = this.getLayer(layerId) ? this.queryRenderedFeatures(e.point, {layers: [layerId]}) : [];
if (!features.length) {
mousein = false;
} else if (!mousein) {
mousein = true;
listener.call(this, new MapMouseEvent(type, this, e.originalEvent, {features}));
}
};
const mouseout = () => {
mousein = false;
};
return {layer: layerId, listener, delegates: {mousemove, mouseout}};
} else if (type === 'mouseleave' || type === 'mouseout') {
let mousein = false;
const mousemove = (e) => {
const features = this.getLayer(layerId) ? this.queryRenderedFeatures(e.point, {layers: [layerId]}) : [];
if (features.length) {
mousein = true;
} else if (mousein) {
mousein = false;
listener.call(this, new MapMouseEvent(type, this, e.originalEvent));
}
};
const mouseout = (e) => {
if (mousein) {
mousein = false;
listener.call(this, new MapMouseEvent(type, this, e.originalEvent));
}
};
return {layer: layerId, listener, delegates: {mousemove, mouseout}};
} else {
const delegate = (e) => {
const features = this.getLayer(layerId) ? this.queryRenderedFeatures(e.point, {layers: [layerId]}) : [];
if (features.length) {
// Here we need to mutate the original event, so that preventDefault works as expected.
e.features = features;
listener.call(this, e);
delete e.features;
}
};
return {layer: layerId, listener, delegates: {[type]: delegate}};
}
}

/**
* Adds a listener for events of a specified type.
*
Expand Down Expand Up @@ -889,53 +937,7 @@ class Map extends Camera {
return super.on(type, layerId);
}

const delegatedListener = (() => {
if (type === 'mouseenter' || type === 'mouseover') {
let mousein = false;
const mousemove = (e) => {
const features = this.getLayer(layerId) ? this.queryRenderedFeatures(e.point, {layers: [layerId]}) : [];
if (!features.length) {
mousein = false;
} else if (!mousein) {
mousein = true;
listener.call(this, new MapMouseEvent(type, this, e.originalEvent, {features}));
}
};
const mouseout = () => {
mousein = false;
};
return {layer: layerId, listener, delegates: {mousemove, mouseout}};
} else if (type === 'mouseleave' || type === 'mouseout') {
let mousein = false;
const mousemove = (e) => {
const features = this.getLayer(layerId) ? this.queryRenderedFeatures(e.point, {layers: [layerId]}) : [];
if (features.length) {
mousein = true;
} else if (mousein) {
mousein = false;
listener.call(this, new MapMouseEvent(type, this, e.originalEvent));
}
};
const mouseout = (e) => {
if (mousein) {
mousein = false;
listener.call(this, new MapMouseEvent(type, this, e.originalEvent));
}
};
return {layer: layerId, listener, delegates: {mousemove, mouseout}};
} else {
const delegate = (e) => {
const features = this.getLayer(layerId) ? this.queryRenderedFeatures(e.point, {layers: [layerId]}) : [];
if (features.length) {
// Here we need to mutate the original event, so that preventDefault works as expected.
e.features = features;
listener.call(this, e);
delete e.features;
}
};
return {layer: layerId, listener, delegates: {[type]: delegate}};
}
})();
const delegatedListener = this._createDelegatedListener(type, layerId, listener);

this._delegatedListeners = this._delegatedListeners || {};
this._delegatedListeners[type] = this._delegatedListeners[type] || [];
Expand All @@ -948,6 +950,51 @@ class Map extends Camera {
return this;
}

/**
* Adds a listener that will be called only once to a specified event type.
*
* @method
* @name once
* @memberof Map
* @instance
* @param {string} type The event type to add a listener for.
* @param {Function} listener The function to be called when the event is fired.
* The listener function is called with the data object passed to `fire`,
* extended with `target` and `type` properties.
* @returns {Map} `this`
*/

/**
* Adds a listener that will be called only once to a specified event type occurring on features in a specified style layer.
*
* @param {string} type The event type to listen for; one of `'mousedown'`, `'mouseup'`, `'click'`, `'dblclick'`,
* `'mousemove'`, `'mouseenter'`, `'mouseleave'`, `'mouseover'`, `'mouseout'`, `'contextmenu'`, `'touchstart'`,
* `'touchend'`, or `'touchcancel'`. `mouseenter` and `mouseover` events are triggered when the cursor enters
* a visible portion of the specified layer from outside that layer or outside the map canvas. `mouseleave`
* and `mouseout` events are triggered when the cursor leaves a visible portion of the specified layer, or leaves
* the map canvas.
* @param {string} layerId The ID of a style layer. Only events whose location is within a visible
* feature in this layer will trigger the listener. The event will have a `features` property containing
* an array of the matching features.
* @param {Function} listener The function to be called when the event is fired.
* @returns {Map} `this`
*/

once(type: MapEvent, layerId: any, listener: any) {

if (listener === undefined) {
return super.once(type, layerId);
}

const delegatedListener = this._createDelegatedListener(type, layerId, listener);

for (const event in delegatedListener.delegates) {
this.once((event: any), delegatedListener.delegates[event]);
}

return this;
}

/**
* Removes an event listener previously added with `Map#on`.
*
Expand All @@ -973,8 +1020,8 @@ class Map extends Camera {
return super.off(type, layerId);
}

if (this._delegatedListeners && this._delegatedListeners[type]) {
const listeners = this._delegatedListeners[type];
const removeDelegatedListener = (delegatedListeners) => {
const listeners = delegatedListeners[type];
for (let i = 0; i < listeners.length; i++) {
const delegatedListener = listeners[i];
if (delegatedListener.layer === layerId && delegatedListener.listener === listener) {
Expand All @@ -985,6 +1032,10 @@ class Map extends Camera {
return this;
}
}
};

if (this._delegatedListeners && this._delegatedListeners[type]) {
removeDelegatedListener(this._delegatedListeners);
}

return this;
Expand Down
2 changes: 1 addition & 1 deletion src/util/evented.js
View file
Expand Up @@ -93,7 +93,7 @@ export class Evented {
* @param {Function} listener The function to be called when the event is fired the first time.
* @returns {Object} `this`
*/
once(type: string, listener: Listener) {
once(type: *, listener: Listener) {
this._oneTimeListeners = this._oneTimeListeners || {};
_addEventListener(type, listener, this._oneTimeListeners);

Expand Down

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