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Add method popN() to Navigator.

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Summary:
Compareing API of
`Navigator`(http://facebook.github.io/react-native/releases/next/docs/navigator.html)
and
`NavigatorIOS`(http://facebook.github.io/react-native/releases/next/docs/navigatorios.html),

we found `Navigator` object lacks of the method `popN()` which is sometimes useful. This PR add it.
Closes https://github.com/facebook/react-native/pull/8806

Differential Revision: D3648001

Pulled By: ericvicenti

fbshipit-source-id: 661efba39e68049fd4a094304ec080092a14296d
This commit is contained in:
yueshuaijie 2016-07-31 13:34:22 -07:00 committed by Facebook Github Bot 9
parent 55bc825092
commit bbe95c2acf
1 changed files with 12 additions and 13 deletions
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25
Libraries/CustomComponents/Navigator/Navigator.js
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@ -1072,14 +1072,17 @@ var Navigator = React.createClass({
});
},
_popN: function(n) {
if (n === 0) {
/**
* Go back N scenes at once. When N=1, behavior matches `pop()`.
* When N is invalid(negative or bigger than current routes count), do nothing.
* @param {number} n The number of scenes to pop. Should be an integer.
*/
popN: function(n) {
invariant(typeof n === 'number', 'Must supply a number to popN');
n = parseInt(n, 10);
if (n <= 0 || this.state.presentedIndex - n < 0) {
return;
}
invariant(
this.state.presentedIndex - n >= 0,
'Cannot pop below zero'
);
var popIndex = this.state.presentedIndex - n;
var presentedRoute = this.state.routeStack[this.state.presentedIndex];
var popSceneConfig = this.props.configureScene(presentedRoute); // using the scene config of the currently presented view
@ -1109,9 +1112,7 @@ var Navigator = React.createClass({
return;
}
if (this.state.presentedIndex > 0) {
this._popN(1);
}
this.popN(1);
},
/**
@ -1185,7 +1186,7 @@ var Navigator = React.createClass({
'Calling popToRoute for a route that doesn\'t exist!'
);
var numToPop = this.state.presentedIndex - indexOfRoute;
this._popN(numToPop);
this.popN(numToPop);
},
/**
@ -1209,9 +1210,7 @@ var Navigator = React.createClass({
this.replaceAtIndex(route, 0, () => {
// Do not use popToRoute here, because race conditions could prevent the
// route from existing at this time. Instead, just go to index 0
if (this.state.presentedIndex > 0) {
this._popN(this.state.presentedIndex);
}
this.popN(this.state.presentedIndex);
});
},