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index.tsx
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import * as React from 'react';
import {
Animated,
Dimensions,
InteractionManager,
LayoutChangeEvent,
StyleSheet,
View,
ViewStyle,
ViewProperties,
} from 'react-native';
import {
EdgeInsets,
SafeAreaConsumer,
SafeAreaInsetsContext,
SafeAreaProvider,
useSafeArea,
useSafeAreaInsets,
} from 'react-native-safe-area-context';
import shallowEquals from './shallowEquals';
// Re-export react-native-safe-area-context utilities
export {
useSafeAreaInsets,
SafeAreaProvider,
SafeAreaInsetsContext,
// Deprecated:
useSafeArea,
SafeAreaConsumer,
};
export type ForceInsetValue = 'always' | 'never';
export type ForceInsetProp = {
top?: ForceInsetValue;
bottom?: ForceInsetValue;
left?: ForceInsetValue;
right?: ForceInsetValue;
horizontal?: ForceInsetValue;
vertical?: ForceInsetValue;
};
interface Props extends ViewProperties {
forceInset?: ForceInsetProp;
}
interface State {
touchesTop: boolean;
touchesBottom: boolean;
touchesLeft: boolean;
touchesRight: boolean;
viewWidth: number;
viewHeight: number;
}
// https://github.com/facebook/react-native/blob/282b8b04e167cb426e40947064c4c18186e093f5/Libraries/ReactNative/DummyUIManager.js#L64
interface AnimatedView extends Animated.AnimatedComponent<View> {
measureInWindow: (
callback: (x: number, y: number, width: number, height: number) => void
) => void;
}
export default class SafeAreaView extends React.Component<Props, State> {
static contextType: any = SafeAreaInsetsContext;
context!: React.ContextType<typeof SafeAreaInsetsContext>;
private _isMounted: boolean = false;
private _view = React.createRef<AnimatedView>();
state: State = {
touchesTop: true,
touchesBottom: true,
touchesLeft: true,
touchesRight: true,
viewWidth: 0,
viewHeight: 0,
};
componentDidMount() {
this._isMounted = true;
InteractionManager.runAfterInteractions(() => {
this._updateMeasurements();
});
}
componentWillUnmount() {
this._isMounted = false;
}
render() {
const { forceInset = false, style, ...props } = this.props;
return (
<Animated.View
// @ts-ignore
ref={this._view}
pointerEvents="box-none"
{...props}
onLayout={this._handleLayout}
style={this._getSafeAreaStyle()}
/>
);
}
_handleLayout = (e: LayoutChangeEvent) => {
if (this.props.onLayout) this.props.onLayout(e);
this._updateMeasurements();
};
_updateMeasurements = () => {
if (!this._isMounted) return;
if (!this._view.current) return;
const { width: WIDTH, height: HEIGHT } = getResolvedDimensions();
// calling getNode on the ref is no longer necessary in the future
const view = this._view.current.measureInWindow
? this._view.current
: this._view.current.getNode();
view.measureInWindow((realX, realY, winWidth, winHeight) => {
if (!this._view.current) {
return;
}
if (realY >= HEIGHT) {
realY = realY % HEIGHT;
} else if (realY < 0) {
realY = (realY % HEIGHT) + HEIGHT;
}
if (realX >= WIDTH) {
realX = realX % WIDTH;
} else if (realX < 0) {
realX = (realX % WIDTH) + WIDTH;
}
let nextState = {
touchesTop: realY === 0,
touchesBottom: realY + winHeight >= HEIGHT,
touchesLeft: realX === 0,
touchesRight: realX + winWidth >= WIDTH,
viewWidth: winWidth,
viewHeight: winHeight,
};
if (!shallowEquals(nextState, this.state)) {
this.setState(nextState);
}
});
};
_getSafeAreaStyle = () => {
const { touchesTop, touchesBottom, touchesLeft, touchesRight } = this.state;
const { forceInset } = this.props;
const {
paddingTop,
paddingBottom,
paddingLeft,
paddingRight,
viewStyle,
} = this._getViewStyles();
const style = {
...viewStyle,
paddingTop: touchesTop ? this._getInset('top') : 0,
paddingBottom: touchesBottom ? this._getInset('bottom') : 0,
paddingLeft: touchesLeft ? this._getInset('left') : 0,
paddingRight: touchesRight ? this._getInset('right') : 0,
};
if (forceInset && typeof forceInset !== 'boolean') {
getKeys(forceInset).forEach(key => {
let inset = 0;
if (forceInset[key] === 'always') {
inset = this._getInset(key);
} else if (forceInset[key] === 'never') {
inset = 0;
}
switch (key) {
case 'horizontal': {
style.paddingLeft = inset;
style.paddingRight = inset;
break;
}
case 'vertical': {
style.paddingTop = inset;
style.paddingBottom = inset;
break;
}
case 'left': {
style.paddingLeft = inset;
break;
}
case 'right': {
style.paddingRight = inset;
break;
}
case 'top': {
style.paddingTop = inset;
break;
}
case 'bottom': {
style.paddingBottom = inset;
break;
}
}
});
}
// new height/width should only include padding from insets
// height/width should not be affected by padding from style obj
if (style.height && typeof style.height === 'number') {
style.height += style.paddingTop + style.paddingBottom;
}
if (style.width && typeof style.width === 'number') {
style.width += style.paddingLeft + style.paddingRight;
}
style.paddingTop = Math.max(style.paddingTop, paddingTop);
style.paddingBottom = Math.max(style.paddingBottom, paddingBottom);
style.paddingLeft = Math.max(style.paddingLeft, paddingLeft);
style.paddingRight = Math.max(style.paddingRight, paddingRight);
return style;
};
_getViewStyles = () => {
const { viewWidth } = this.state;
// get padding values from style to add back in after insets are determined
// default precedence: padding[Side] -> vertical | horizontal -> padding -> 0
let {
padding = 0,
paddingVertical = padding,
paddingHorizontal = padding,
paddingTop = paddingVertical,
paddingBottom = paddingVertical,
paddingLeft = paddingHorizontal,
paddingRight = paddingHorizontal,
...viewStyle
}: ViewStyle = StyleSheet.flatten(this.props.style || {});
if (typeof paddingTop !== 'number') {
paddingTop = doubleFromPercentString(paddingTop) * viewWidth;
}
if (typeof paddingBottom !== 'number') {
paddingBottom = doubleFromPercentString(paddingBottom) * viewWidth;
}
if (typeof paddingLeft !== 'number') {
paddingLeft = doubleFromPercentString(paddingLeft) * viewWidth;
}
if (typeof paddingRight !== 'number') {
paddingRight = doubleFromPercentString(paddingRight) * viewWidth;
}
return {
paddingTop,
paddingBottom,
paddingLeft,
paddingRight,
viewStyle,
};
};
_getInset = (key: keyof ForceInsetProp) => {
if (this.context === null) {
throw new Error(
'<SafeAreaView /> must be wrapped by react-native-safe-area-context <SafeAreaProvider />'
);
} else if (key === 'horizontal') {
return Math.max(this.context.left, this.context.right);
} else if (key === 'vertical') {
return Math.max(this.context.top, this.context.bottom);
} else {
return this.context[key as keyof EdgeInsets];
}
};
}
// note(brentvatne): it is unclear to me why this function exists but I will
// leave it
function getResolvedDimensions() {
const { width, height } = Dimensions.get('window');
if (width === 0 && height === 0) return Dimensions.get('screen');
return { width, height };
}
// Convert percentage string, eg: 50%, to double, eg: 0.5
function doubleFromPercentString(percent: string): number {
if (!percent.includes('%')) {
return 0;
}
const dbl = parseFloat(percent) / 100;
if (isNaN(dbl)) return 0;
return dbl;
}
// Utility to iterate over keys in object and have each key typed
function getKeys<T extends {}>(object: T): Array<keyof T> {
return Object.keys(object) as Array<keyof T>;
}