CardStackStyleInterpolator.js
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import { I18nManager } from 'react-native';
import getSceneIndicesForInterpolationInputRange from '../../utils/getSceneIndicesForInterpolationInputRange';
/**
* Utility that builds the style for the card in the cards stack.
*
* +------------+
* +-+ |
* +-+ | |
* | | | |
* | | | Focused |
* | | | Card |
* | | | |
* +-+ | |
* +-+ |
* +------------+
*/
/**
* Render the initial style when the initial layout isn't measured yet.
*/
function forInitial(props) {
const { navigation, scene } = props;
const focused = navigation.state.index === scene.index;
const opacity = focused ? 1 : 0;
// If not focused, move the scene far away.
const translate = focused ? 0 : 1000000;
return {
opacity,
transform: [{ translateX: translate }, { translateY: translate }]
};
}
/**
* Standard iOS-style slide in from the right.
*/
function forHorizontal(props) {
const { layout, position, scene } = props;
if (!layout.isMeasured) {
return forInitial(props);
}
const interpolate = getSceneIndicesForInterpolationInputRange(props);
if (!interpolate) return { opacity: 0 };
const { first, last } = interpolate;
const index = scene.index;
const opacity = position.interpolate({
inputRange: [first, first + 0.01, index, last - 0.01, last],
outputRange: [0, 1, 1, 0.85, 0]
});
const width = layout.initWidth;
const translateX = position.interpolate({
inputRange: [first, index, last],
outputRange: I18nManager.isRTL ? [-width, 0, width * 0.3] : [width, 0, width * -0.3]
});
const translateY = 0;
return {
opacity,
transform: [{ translateX }, { translateY }]
};
}
/**
* Standard iOS-style slide in from the bottom (used for modals).
*/
function forVertical(props) {
const { layout, position, scene } = props;
if (!layout.isMeasured) {
return forInitial(props);
}
const interpolate = getSceneIndicesForInterpolationInputRange(props);
if (!interpolate) return { opacity: 0 };
const { first, last } = interpolate;
const index = scene.index;
const opacity = position.interpolate({
inputRange: [first, first + 0.01, index, last - 0.01, last],
outputRange: [0, 1, 1, 0.85, 0]
});
const height = layout.initHeight;
const translateY = position.interpolate({
inputRange: [first, index, last],
outputRange: [height, 0, 0]
});
const translateX = 0;
return {
opacity,
transform: [{ translateX }, { translateY }]
};
}
/**
* Standard Android-style fade in from the bottom.
*/
function forFadeFromBottomAndroid(props) {
const { layout, position, scene } = props;
if (!layout.isMeasured) {
return forInitial(props);
}
const interpolate = getSceneIndicesForInterpolationInputRange(props);
if (!interpolate) return { opacity: 0 };
const { first, last } = interpolate;
const index = scene.index;
const inputRange = [first, index, last - 0.01, last];
const opacity = position.interpolate({
inputRange,
outputRange: [0, 1, 1, 0]
});
const translateY = position.interpolate({
inputRange,
outputRange: [50, 0, 0, 0]
});
const translateX = 0;
return {
opacity,
transform: [{ translateX }, { translateY }]
};
}
/**
* fadeIn and fadeOut
*/
function forFade(props) {
const { layout, position, scene } = props;
if (!layout.isMeasured) {
return forInitial(props);
}
const interpolate = getSceneIndicesForInterpolationInputRange(props);
if (!interpolate) return { opacity: 0 };
const { first, last } = interpolate;
const index = scene.index;
const opacity = position.interpolate({
inputRange: [first, index, last],
outputRange: [0, 1, 1]
});
return {
opacity
};
}
function canUseNativeDriver() {
// The native driver can be enabled for this interpolator animating
// opacity, translateX, and translateY is supported by the native animation
// driver on iOS and Android.
return true;
}
export default {
forHorizontal,
forVertical,
forFadeFromBottomAndroid,
forFade,
canUseNativeDriver
};