react-native-paper/lib/module/components/Modal.js

Material design for React Native

import * as React from 'react';
import { Animated, Easing, StyleSheet, Pressable, View } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import useLatestCallback from 'use-latest-callback';
import Surface from './Surface';
import { useInternalTheme } from '../core/theming';
import { addEventListener } from '../utils/addEventListener';
import { BackHandler } from '../utils/BackHandler/BackHandler';
import useAnimatedValue from '../utils/useAnimatedValue';
const DEFAULT_DURATION = 220;
const AnimatedPressable = Animated.createAnimatedComponent(Pressable);

/**
 * The Modal component is a simple way to present content above an enclosing view.
 * To render the `Modal` above other components, you'll need to wrap it with the [`Portal`](./Portal) component.
 *
 * ## Usage
 * ```js
 * import * as React from 'react';
 * import { Modal, Portal, Text, Button, PaperProvider } from 'react-native-paper';
 *
 * const MyComponent = () => {
 *   const [visible, setVisible] = React.useState(false);
 *
 *   const showModal = () => setVisible(true);
 *   const hideModal = () => setVisible(false);
 *   const containerStyle = {backgroundColor: 'white', padding: 20};
 *
 *   return (
 *     <PaperProvider>
 *       <Portal>
 *         <Modal visible={visible} onDismiss={hideModal} contentContainerStyle={containerStyle}>
 *           <Text>Example Modal.  Click outside this area to dismiss.</Text>
 *         </Modal>
 *       </Portal>
 *       <Button style={{marginTop: 30}} onPress={showModal}>
 *         Show
 *       </Button>
 *     </PaperProvider>
 *   );
 * };
 *
 * export default MyComponent;
 * ```
 */
function Modal(_ref) {
  var _theme$colors;
  let {
    dismissable = true,
    dismissableBackButton = dismissable,
    visible = false,
    overlayAccessibilityLabel = 'Close modal',
    onDismiss = () => {},
    children,
    contentContainerStyle,
    style,
    theme: themeOverrides,
    testID = 'modal'
  } = _ref;
  const theme = useInternalTheme(themeOverrides);
  const onDismissCallback = useLatestCallback(onDismiss);
  const {
    scale
  } = theme.animation;
  const {
    top,
    bottom
  } = useSafeAreaInsets();
  const opacity = useAnimatedValue(visible ? 1 : 0);
  const [visibleInternal, setVisibleInternal] = React.useState(visible);
  const showModalAnimation = React.useCallback(() => {
    Animated.timing(opacity, {
      toValue: 1,
      duration: scale * DEFAULT_DURATION,
      easing: Easing.out(Easing.cubic),
      useNativeDriver: true
    }).start();
  }, [opacity, scale]);
  const hideModalAnimation = React.useCallback(() => {
    Animated.timing(opacity, {
      toValue: 0,
      duration: scale * DEFAULT_DURATION,
      easing: Easing.out(Easing.cubic),
      useNativeDriver: true
    }).start(_ref2 => {
      let {
        finished
      } = _ref2;
      if (!finished) {
        return;
      }
      setVisibleInternal(false);
    });
  }, [opacity, scale]);
  React.useEffect(() => {
    if (visibleInternal === visible) {
      return;
    }
    if (!visibleInternal && visible) {
      setVisibleInternal(true);
      return showModalAnimation();
    }
    if (visibleInternal && !visible) {
      return hideModalAnimation();
    }
  }, [visible, showModalAnimation, hideModalAnimation, visibleInternal]);
  React.useEffect(() => {
    if (!visible) {
      return undefined;
    }
    const onHardwareBackPress = () => {
      if (dismissable || dismissableBackButton) {
        onDismissCallback();
      }
      return true;
    };
    const subscription = addEventListener(BackHandler, 'hardwareBackPress', onHardwareBackPress);
    return () => subscription.remove();
  }, [dismissable, dismissableBackButton, onDismissCallback, visible]);
  if (!visibleInternal) {
    return null;
  }
  return /*#__PURE__*/React.createElement(Animated.View, {
    pointerEvents: visible ? 'auto' : 'none',
    accessibilityViewIsModal: true,
    accessibilityLiveRegion: "polite",
    style: StyleSheet.absoluteFill,
    onAccessibilityEscape: onDismissCallback,
    testID: testID
  }, /*#__PURE__*/React.createElement(AnimatedPressable, {
    accessibilityLabel: overlayAccessibilityLabel,
    accessibilityRole: "button",
    disabled: !dismissable,
    onPress: dismissable ? onDismissCallback : undefined,
    importantForAccessibility: "no",
    style: [styles.backdrop, {
      backgroundColor: (_theme$colors = theme.colors) === null || _theme$colors === void 0 ? void 0 : _theme$colors.backdrop,
      opacity
    }],
    testID: `${testID}-backdrop`
  }), /*#__PURE__*/React.createElement(View, {
    style: [styles.wrapper, {
      marginTop: top,
      marginBottom: bottom
    }, style],
    pointerEvents: "box-none",
    testID: `${testID}-wrapper`
  }, /*#__PURE__*/React.createElement(Surface, {
    testID: `${testID}-surface`,
    theme: theme,
    style: [{
      opacity
    }, styles.content, contentContainerStyle]
  }, children)));
}
export default Modal;
const styles = StyleSheet.create({
  backdrop: {
    flex: 1
  },
  wrapper: {
    ...StyleSheet.absoluteFillObject,
    justifyContent: 'center'
  },
  // eslint-disable-next-line react-native/no-color-literals
  content: {
    backgroundColor: 'transparent',
    justifyContent: 'center'
  }
});
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