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// @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);
}
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