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
|
// @flow
import TransitionRule from './lib/transition-rule';
import type { TransitionFork, TransitionDescriptor } from './lib/transition-rule';
export type TransitionGroupProps = {
name: string,
duration: number,
};
type TransitionMap = {
[name: string]: TransitionFork,
};
/**
* Transition descriptors
*/
const transitions: TransitionMap = {
slide: {
forward: {
name: 'slide-up',
duration: 450,
},
backward: {
name: 'slide-down',
duration: 450,
},
},
push: {
forward: {
name: 'push',
duration: 450,
},
backward: {
name: 'pop',
duration: 450,
},
},
};
/**
* Transition rules
* (null) is used to indicate any route.
*/
const transitionRules = [
r('/settings', '/settings/account', transitions.push),
r('/settings', '/settings/preferences', transitions.push),
r('/settings', '/settings/advanced', transitions.push),
r('/settings', '/settings/support', transitions.push),
r(null, '/settings', transitions.slide),
r(null, '/select-location', transitions.slide),
];
/**
* Calculate TransitionGroup props.
*
* @param {string} [fromRoute] - source route
* @param {string} toRoute - target route
*/
export function getTransitionProps(fromRoute: ?string, toRoute: string): TransitionGroupProps {
// ignore initial transition and transition between the same routes
if (!fromRoute || fromRoute === toRoute) {
return noTransitionProps();
}
for (const rule of transitionRules) {
const match = rule.match(fromRoute, toRoute);
if (match) {
return toTransitionGroupProps(match.descriptor);
}
}
return noTransitionProps();
}
/**
* Integrate TransitionDescriptor into TransitionGroupProps
* @param {TransitionDescriptor} descriptor
*/
function toTransitionGroupProps(descriptor: TransitionDescriptor): TransitionGroupProps {
const { name, duration } = descriptor;
return {
name: name,
duration: duration,
};
}
/**
* Returns default props with no animation
*/
function noTransitionProps(): TransitionGroupProps {
return {
name: '',
duration: 0,
};
}
/**
* Shortcut to create TransitionRule
*/
function r(from: ?string, to: string, fork: TransitionFork): TransitionRule {
return new TransitionRule(from, to, fork);
}
|
