HeaderStyleInterpolator.js
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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _reactNative = require('react-native');
var _getSceneIndicesForInterpolationInputRange = require('../../utils/getSceneIndicesForInterpolationInputRange');
var _getSceneIndicesForInterpolationInputRange2 = _interopRequireDefault(_getSceneIndicesForInterpolationInputRange);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
* Utility that builds the style for the navigation header.
*
* +-------------+-------------+-------------+
* | | | |
* | Left | Title | Right |
* | Component | Component | Component |
* | | | |
* +-------------+-------------+-------------+
*/
function forLeft(props) {
var position = props.position,
scene = props.scene,
scenes = props.scenes;
var interpolate = (0, _getSceneIndicesForInterpolationInputRange2.default)(props);
if (!interpolate) return { opacity: 0 };
var first = interpolate.first,
last = interpolate.last;
var index = scene.index;
return {
opacity: position.interpolate({
inputRange: [first, first + Math.abs(index - first) / 2, index, last - Math.abs(last - index) / 2, last],
outputRange: [0, 0, 1, 0, 0]
})
};
}
function forCenter(props) {
var position = props.position,
scene = props.scene;
var interpolate = (0, _getSceneIndicesForInterpolationInputRange2.default)(props);
if (!interpolate) return { opacity: 0 };
var first = interpolate.first,
last = interpolate.last;
var index = scene.index;
var inputRange = [first, index, last];
return {
opacity: position.interpolate({
inputRange: inputRange,
outputRange: [0, 1, 0]
}),
transform: [{
translateX: position.interpolate({
inputRange: inputRange,
outputRange: _reactNative.I18nManager.isRTL ? [-200, 0, 200] : [200, 0, -200]
})
}]
};
}
function forRight(props) {
var position = props.position,
scene = props.scene;
var interpolate = (0, _getSceneIndicesForInterpolationInputRange2.default)(props);
if (!interpolate) return { opacity: 0 };
var first = interpolate.first,
last = interpolate.last;
var index = scene.index;
return {
opacity: position.interpolate({
inputRange: [first, index, last],
outputRange: [0, 1, 0]
})
};
}
exports.default = {
forLeft: forLeft,
forCenter: forCenter,
forRight: forRight
};