99 lines
3.3 KiB
JavaScript
99 lines
3.3 KiB
JavaScript
import {listen, listenOnce, unlistenByKey} from '../../../src/ol/events.js';
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import EventTarget from '../../../src/ol/events/Target.js';
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describe('ol.events', function() {
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let add, target;
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beforeEach(function() {
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target = new EventTarget();
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add = sinon.spy(target, 'addEventListener');
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});
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afterEach(function() {
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target.addEventListener.restore();
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});
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describe('listen()', function() {
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it('calls addEventListener on the target', function() {
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listen(target, 'foo', function() {});
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expect(add.callCount).to.be(1);
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});
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it('returns a key', function() {
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const key = listen(target, 'foo', function() {});
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expect(key).to.be.a(Object);
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});
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it('does not add the same listener twice', function() {
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const listener = function() {};
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listen(target, 'foo', listener);
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listen(target, 'foo', listener);
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expect(target.listeners_['foo'].length).to.be(1);
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});
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it('only treats listeners as same when all args are equal', function() {
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const listener = function() {};
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listen(target, 'foo', listener, {});
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listen(target, 'foo', listener, {});
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listen(target, 'foo', listener, undefined);
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expect(target.listeners_['foo'].length).to.be(3);
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});
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});
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describe('listenOnce()', function() {
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it('creates a one-off listener', function() {
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const target = new EventTarget();
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const listener = sinon.spy();
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listenOnce(target, 'foo', listener);
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target.dispatchEvent('foo');
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expect(listener.callCount).to.be(1);
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target.dispatchEvent('foo');
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expect(listener.callCount).to.be(1);
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});
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it('Adds the same listener twice', function() {
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const listener = sinon.spy();
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listenOnce(target, 'foo', listener);
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listenOnce(target, 'foo', listener);
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target.dispatchEvent('foo');
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target.dispatchEvent('foo');
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target.dispatchEvent('foo');
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expect(listener.callCount).to.be(2);
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});
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});
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describe('unlistenByKey()', function() {
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it('unregisters previously registered listeners', function() {
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const key = listen(target, 'foo', function() {});
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unlistenByKey(key);
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expect(target.listeners_['foo']).to.be(undefined);
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});
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it('works with multiple types', function() {
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const key = listen(target, ['foo', 'bar'], function() {});
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unlistenByKey(key);
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expect(target.listeners_['foo']).to.be(undefined);
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expect(target.listeners_['bar']).to.be(undefined);
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});
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});
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describe('Listener keys', function() {
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it('does not register duplicated listeners', function() {
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const target = new EventTarget();
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const listener = function() {};
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const key1 = listen(target, 'foo', listener);
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expect(target.listeners_['foo']).to.eql([listener]);
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const key2 = listen(target, 'foo', listener);
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expect(target.listeners_['foo']).to.eql([listener]);
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expect(key1.listener).to.equal(key2.listener);
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});
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it('registers multiple listeners if this object is different', function() {
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const target = new EventTarget();
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const listener = function() {};
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const key1 = listen(target, 'foo', listener, {});
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const key2 = listen(target, 'foo', listener, {});
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expect(key1.listener).to.not.equal(key2.listener);
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expect(target.listeners_['foo']).to.eql([key1.listener, key2.listener]);
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});
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});
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});
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