| 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260 |
1x
16x
16x
28x
21x
21x
16x
2x
2x
2x
2x
2x
16x
2x
2x
1x
1x
16x
2x
2x
1x
1x
16x
16x
16x
8x
16x
13x
13x
13x
13x
13x
13x
11x
11x
1x
1x
11x
1x
10x
1x
9x
8x
1x
11x
11x
11x
9x
9x
9x
9x
9x
9x
9x
28x
28x
60x
47x
47x
47x
13x
29x
29x
2x
27x
1x
1x
1x
47x
47x
26x
2x
24x
21x
1x
1x
1x
5x
11x
1x
| import React from 'react';
import PropTypes from 'prop-types';
const Context = React.createContext();
class Carousel extends React.Component {
constructor (props) {
super(props);
const slideCount = React.Children
.map(props.children, (C, i) => {
if (C.type === Slide) {
return React.cloneElement(C, {key: i, index: i});
}
})
.filter(C => React.isValidElement(C)).length;
const setActiveSlideIndex = index => {
this.intervalId = clearInterval(this.intervalId);
this.internalSetState(
prevState => {
return {
activeSlideIndex: this.getNextSlideIndex(
index,
prevState.activeSlideIndex,
slideCount,
props.loop,
),
};
},
() => {
this.initInterval();
this.onSlideChange();
},
);
};
const stop = () => {
const {isPlaying} = this.state;
if (isPlaying) {
this.intervalId = clearInterval(this.intervalId);
this.internalSetState({isPlaying: false});
}
};
const play = () => {
const {isPlaying} = this.state;
if (!isPlaying) {
this.internalSetState({isPlaying: true}, () => {
this.initInterval();
});
}
};
this.state = {
slideCount,
setActiveSlideIndex,
stop,
play,
isPlaying: props.autoplay,
autoplay: props.autoplay,
interval: props.interval,
direction: props.direction,
loop: props.loop,
onSlideChange: props.onSlideChange,
activeSlideIndex: 0,
};
}
componentDidMount () {
const {autoplay, slideCount} = this.state;
if (autoplay && slideCount >= 2) {
this.initInterval();
}
}
componentWillUnmount () {
this.intervalId = clearInterval(this.intervalId);
}
// God bless Kent C. Dodds
internalSetState (changes, callback) {
this.setState((state, props) => {
const stateToSet = [changes]
.map(c => (typeof c === 'function' ? c(state, props) : c))
.map(
c =>
props.stateReducer ? props.stateReducer(state, c) : c,
)
.map(({type: ignoredType, ...c}) => c)[0];
return stateToSet;
}, callback);
}
onSlideChange = () => {
const {onSlideChange} = this.state;
if (onSlideChange) {
const {activeSlideIndex} = this.state;
onSlideChange(activeSlideIndex);
}
};
// Sorry, I'm bad at computer science, Ryan
getNextSlideIndex = (index, prevIndex, slideCount, loop) => {
if (index > slideCount - 1 && loop) {
return 0;
}
if (index < 0) {
return slideCount - 1;
}
if (index >= 0 && index < slideCount) {
return index;
}
return prevIndex;
};
initInterval = () => {
const {interval} = this.state;
Eif (!this.intervalId) {
this.intervalId = setInterval(this.goToNextSlide, interval);
}
};
goToNextSlide = () => {
const {isPlaying} = this.state;
Eif (isPlaying) {
this.internalSetState(
prevState => {
const {
slideCount,
activeSlideIndex,
direction,
loop,
} = this.state;
const nextIndex = this.getNextSlideIndex(
activeSlideIndex + direction,
prevState.activeSlideIndex,
slideCount,
loop,
);
return {
activeSlideIndex: nextIndex,
isPlaying: nextIndex !== prevState.activeSlideIndex,
};
},
() => {
this.onSlideChange();
},
);
}
};
renderChildren = children => {
let slideIndex = 0;
return React.Children.map(children, (C, i) => {
if (C.type === Slide) {
const clone = React.cloneElement(C, {
key: i,
index: slideIndex,
});
slideIndex += 1;
return clone;
}
return C;
});
};
render () {
const {children, as: Component, ...props} = this.props;
if (Component) {
return (
<Context.Provider value={this.state}>
<Component {...props}>
{typeof children === 'function' ? (
children
) : (
this.renderChildren(children)
)}
</Component>
</Context.Provider>
);
}
return (
<Context.Provider value={this.state}>
{this.renderChildren(children)}
</Context.Provider>
);
}
}
Carousel.defaultProps = {
autoplay: true,
interval: 2500,
direction: 1,
loop: true,
onSlideChange: null,
};
Carousel.propTypes = {
children: PropTypes.oneOfType([
PropTypes.element,
PropTypes.arrayOf(
PropTypes.oneOfType([PropTypes.element, PropTypes.array]),
),
PropTypes.func,
]).isRequired,
autoplay: PropTypes.bool,
interval: PropTypes.number,
direction: PropTypes.number,
loop: PropTypes.bool,
onSlideChange: PropTypes.func,
};
const Slide = ({index, children, as: Component, preventUnmount, ...props}) => {
return (
<Context.Consumer>
{({activeSlideIndex}) => {
if (index === activeSlideIndex || preventUnmount) {
if (Component) {
return <Component {...props}>{children}</Component>;
}
return children;
}
return null;
}}
</Context.Consumer>
);
};
Slide.defaultProps = {
index: undefined,
as: undefined,
preventUnmount: false,
};
Slide.propTypes = {
children: PropTypes.oneOfType([PropTypes.element, PropTypes.func])
.isRequired,
index: PropTypes.number,
as: PropTypes.oneOfType([
PropTypes.element,
PropTypes.func,
PropTypes.string,
]),
preventUnmount: PropTypes.bool,
};
const Control = ({children}) => {
return (
<Context.Consumer>
{props => {
return children({...props});
}}
</Context.Consumer>
);
};
Control.propTypes = {
children: PropTypes.func.isRequired,
};
export default Carousel;
export {Slide, Control};
|