535 lines
20 KiB
JavaScript
535 lines
20 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule View
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* @flow
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*/
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'use strict';
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const EdgeInsetsPropType = require('EdgeInsetsPropType');
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const NativeMethodsMixin = require('react/lib/NativeMethodsMixin');
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const PropTypes = require('react/lib/ReactPropTypes');
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const React = require('React');
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const ReactNativeStyleAttributes = require('ReactNativeStyleAttributes');
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const ReactNativeViewAttributes = require('ReactNativeViewAttributes');
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const StyleSheetPropType = require('StyleSheetPropType');
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const UIManager = require('UIManager');
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const ViewStylePropTypes = require('ViewStylePropTypes');
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const requireNativeComponent = require('requireNativeComponent');
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const stylePropType = StyleSheetPropType(ViewStylePropTypes);
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const AccessibilityTraits = [
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'none',
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'button',
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'link',
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'header',
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'search',
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'image',
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'selected',
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'plays',
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'key',
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'text',
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'summary',
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'disabled',
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'frequentUpdates',
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'startsMedia',
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'adjustable',
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'allowsDirectInteraction',
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'pageTurn',
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];
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const AccessibilityComponentType = [
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'none',
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'button',
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'radiobutton_checked',
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'radiobutton_unchecked',
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];
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const forceTouchAvailable = (UIManager.RCTView.Constants &&
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UIManager.RCTView.Constants.forceTouchAvailable) || false;
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const statics = {
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AccessibilityTraits,
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AccessibilityComponentType,
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/**
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* Is 3D Touch / Force Touch available (i.e. will touch events include `force`)
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* @platform ios
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*/
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forceTouchAvailable,
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};
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/**
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* The most fundamental component for building a UI, `View` is a container that supports layout with
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* [flexbox](/react-native/docs/flexbox.html), [style](/react-native/docs/style.html),
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* [some touch handling](/react-native/docs/handling-touches.html), and
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* [accessibility](/react-native/docs/accessibility.html) controls. `View` maps directly to the
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* native view equivalent on whatever platform React Native is running on, whether that is a
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* `UIView`, `<div>`, `android.view`, etc.
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*
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* `View` is designed to be nested inside other views and can have 0 to many children of any type.
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*
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* This example creates a `View` that wraps two colored boxes and a text component in a row with
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* padding.
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*
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* ```javascript
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* class ViewColoredBoxesWithText extends Component {
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* render() {
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* return (
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* <View style={{flexDirection: 'row', height: 100, padding: 20}}>
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* <View style={{backgroundColor: 'blue', flex: 0.3}} />
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* <View style={{backgroundColor: 'red', flex: 0.5}} />
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* <Text>Hello World!</Text>
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* </View>
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* );
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* }
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* }
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* ```
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*
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* > `View`s are designed to be used with [`StyleSheet`](/react-native/docs/style.html) for clarity
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* > and performance, although inline styles are also supported.
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*
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* ### Synthetic Touch Events
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*
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* For `View` repsonder props (e.g., `onResponderMove`), the synthetic touch event passed to them
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* are of the following form:
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*
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* - `nativeEvent`
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* - `changedTouches` - Array of all touch events that have changed since the last event.
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* - `identifier` - The ID of the touch.
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* - `locationX` - The X position of the touch, relative to the element.
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* - `locationY` - The Y position of the touch, relative to the element.
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* - `pageX` - The X position of the touch, relative to the root element.
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* - `pageY` - The Y position of the touch, relative to the root element.
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* - `target` - The node id of the element receiving the touch event.
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* - `timestamp` - A time identifier for the touch, useful for velocity calculation.
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* - `touches` - Array of all current touches on the screen.
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*/
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const View = React.createClass({
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// TODO: We should probably expose the mixins, viewConfig, and statics publicly. For example,
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// one of the props is of type AccessibilityComponentType. That is defined as a const[] above,
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// but it is not rendered by the docs, since `statics` below is not rendered. So its Possible
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// values had to be hardcoded.
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mixins: [NativeMethodsMixin],
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/**
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* `NativeMethodsMixin` will look for this when invoking `setNativeProps`. We
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* make `this` look like an actual native component class.
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*/
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viewConfig: {
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uiViewClassName: 'RCTView',
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validAttributes: ReactNativeViewAttributes.RCTView
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},
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statics: {
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...statics,
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},
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propTypes: {
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/**
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* When `true`, indicates that the view is an accessibility element. By default,
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* all the touchable elements are accessible.
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*/
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accessible: PropTypes.bool,
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/**
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* Overrides the text that's read by the screen reader when the user interacts
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* with the element. By default, the label is constructed by traversing all the
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* children and accumulating all the `Text` nodes separated by space.
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*/
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accessibilityLabel: PropTypes.string,
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/**
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* Indicates to accessibility services to treat UI component like a
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* native one. Works for Android only.
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*
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* Possible values are one of:
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*
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* - `'none'`
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* - `'button'`
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* - `'radiobutton_checked'`
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* - `'radiobutton_unchecked'`
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*
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* @platform android
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*/
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accessibilityComponentType: PropTypes.oneOf(AccessibilityComponentType),
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/**
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* Indicates to accessibility services whether the user should be notified
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* when this view changes. Works for Android API >= 19 only.
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* Possible values:
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*
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* - `'none'` - Accessibility services should not announce changes to this view.
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* - `'polite'`- Accessibility services should announce changes to this view.
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* - `'assertive'` - Accessibility services should interrupt ongoing speech to immediately announce changes to this view.
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*
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* See the [Android `View` docs](http://developer.android.com/reference/android/view/View.html#attr_android:accessibilityLiveRegion)
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* for reference.
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*
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* @platform android
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*/
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accessibilityLiveRegion: PropTypes.oneOf([
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'none',
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'polite',
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'assertive',
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]),
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/**
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* Controls how view is important for accessibility which is if it
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* fires accessibility events and if it is reported to accessibility services
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* that query the screen. Works for Android only.
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*
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* Possible values:
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*
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* - `'auto'` - The system determines whether the view is important for accessibility -
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* default (recommended).
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* - `'yes'` - The view is important for accessibility.
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* - `'no'` - The view is not important for accessibility.
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* - `'no-hide-descendants'` - The view is not important for accessibility,
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* nor are any of its descendant views.
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*
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* See the [Android `importantForAccessibility` docs]( [http://developer.android.com/reference/android/R.attr.html#importantForAccessibility)
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* for reference.
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*
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* @platform android
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*/
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importantForAccessibility: PropTypes.oneOf([
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'auto',
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'yes',
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'no',
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'no-hide-descendants',
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]),
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/**
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* Provides additional traits to screen reader. By default no traits are
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* provided unless specified otherwise in element.
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*
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* You can provide one trait or an array of many traits.
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*
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* Possible values for `AccessibilityTraits` are:
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*
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* - `'none'` - The element has no traits.
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* - `'button'` - The element should be treated as a button.
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* - `'link'` - The element should be treated as a link.
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* - `'header'` - The element is a header that divides content into sections.
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* - `'search'` - The element should be treated as a search field.
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* - `'image'` - The element should be treated as an image.
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* - `'selected'` - The element is selected.
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* - `'plays'` - The element plays sound.
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* - `'key'` - The element should be treated like a keyboard key.
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* - `'text'` - The element should be treated as text.
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* - `'summary'` - The element provides app summary information.
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* - `'disabled'` - The element is disabled.
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* - `'frequentUpdates'` - The element frequently changes its value.
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* - `'startsMedia'` - The element starts a media session.
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* - `'adjustable'` - The element allows adjustment over a range of values.
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* - `'allowsDirectInteraction'` - The element allows direct touch interaction for VoiceOver users.
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* - `'pageTurn'` - Informs VoiceOver that it should scroll to the next page when it finishes reading the contents of the element.
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*
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* See the [Accessibility guide](/react-native/docs/accessibility.html#accessibilitytraits-ios)
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* for more information.
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*
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* @platform ios
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*/
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accessibilityTraits: PropTypes.oneOfType([
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PropTypes.oneOf(AccessibilityTraits),
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PropTypes.arrayOf(PropTypes.oneOf(AccessibilityTraits)),
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]),
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/**
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* When `accessible` is true, the system will try to invoke this function
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* when the user performs accessibility tap gesture.
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*/
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onAccessibilityTap: PropTypes.func,
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/**
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* When `accessible` is `true`, the system will invoke this function when the
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* user performs the magic tap gesture.
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*/
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onMagicTap: PropTypes.func,
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/**
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* Used to locate this view in end-to-end tests.
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*
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* > This disables the 'layout-only view removal' optimization for this view!
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*/
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testID: PropTypes.string,
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/**
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* For most touch interactions, you'll simply want to wrap your component in
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* `TouchableHighlight` or `TouchableOpacity`. Check out `Touchable.js`,
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* `ScrollResponder.js` and `ResponderEventPlugin.js` for more discussion.
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*/
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/**
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* The View is now responding for touch events. This is the time to highlight and show the user
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* what is happening.
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*
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* `View.props.onResponderGrant: (event) => {}`, where `event` is a synthetic touch event as
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* described above.
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*/
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onResponderGrant: PropTypes.func,
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/**
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* The user is moving their finger.
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*
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* `View.props.onResponderMove: (event) => {}`, where `event` is a synthetic touch event as
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* described above.
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*/
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onResponderMove: PropTypes.func,
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/**
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* Another responder is already active and will not release it to that `View` asking to be
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* the responder.
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*
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* `View.props.onResponderReject: (event) => {}`, where `event` is a synthetic touch event as
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* described above.
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*/
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onResponderReject: PropTypes.func,
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/**
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* Fired at the end of the touch.
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*
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* `View.props.onResponderRelease: (event) => {}`, where `event` is a synthetic touch event as
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* described above.
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*/
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onResponderRelease: PropTypes.func,
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/**
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* The responder has been taken from the `View`. Might be taken by other views after a call to
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* `onResponderTerminationRequest`, or might be taken by the OS without asking (e.g., happens
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* with control center/ notification center on iOS)
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*
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* `View.props.onResponderTerminate: (event) => {}`, where `event` is a synthetic touch event as
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* described above.
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*/
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onResponderTerminate: PropTypes.func,
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/**
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* Some other `View` wants to become responder and is asking this `View` to release its
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* responder. Returning `true` allows its release.
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*
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* `View.props.onResponderTerminationRequest: (event) => {}`, where `event` is a synthetic touch
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* event as described above.
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*/
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onResponderTerminationRequest: PropTypes.func,
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/**
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* Does this view want to become responder on the start of a touch?
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*
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* `View.props.onStartShouldSetResponder: (event) => [true | false]`, where `event` is a
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* synthetic touch event as described above.
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*/
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onStartShouldSetResponder: PropTypes.func,
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/**
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* If a parent `View` wants to prevent a child `View` from becoming responder on a touch start,
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* it should have this handler which returns `true`.
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*
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* `View.props.onStartShouldSetResponderCapture: (event) => [true | false]`, where `event` is a
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* synthetic touch event as described above.
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*/
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onStartShouldSetResponderCapture: PropTypes.func,
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/**
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* Does this view want to "claim" touch responsiveness? This is called for every touch move on
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* the `View` when it is not the responder.
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*
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* `View.props.onMoveShouldSetResponder: (event) => [true | false]`, where `event` is a
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* synthetic touch event as described above.
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*/
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onMoveShouldSetResponder: PropTypes.func,
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/**
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* If a parent `View` wants to prevent a child `View` from becoming responder on a move,
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* it should have this handler which returns `true`.
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*
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* `View.props.onMoveShouldSetResponderCapture: (event) => [true | false]`, where `event` is a
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* synthetic touch event as described above.
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*/
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onMoveShouldSetResponderCapture: PropTypes.func,
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/**
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* This defines how far a touch event can start away from the view.
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* Typical interface guidelines recommend touch targets that are at least
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* 30 - 40 points/density-independent pixels.
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*
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* For example, if a touchable view has a height of 20 the touchable height can be extended to
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* 40 with `hitSlop={{top: 10, bottom: 10, left: 0, right: 0}}`
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*
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* > The touch area never extends past the parent view bounds and the Z-index
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* > of sibling views always takes precedence if a touch hits two overlapping
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* > views.
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*/
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hitSlop: EdgeInsetsPropType,
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/**
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* Invoked on mount and layout changes with:
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*
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* `{nativeEvent: { layout: {x, y, width, height}}}`
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*
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* This event is fired immediately once the layout has been calculated, but
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* the new layout may not yet be reflected on the screen at the time the
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* event is received, especially if a layout animation is in progress.
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*/
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onLayout: PropTypes.func,
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/**
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* Controls whether the `View` can be the target of touch events.
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*
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* - `'auto'`: The View can be the target of touch events.
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* - `'none'`: The View is never the target of touch events.
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* - `'box-none'`: The View is never the target of touch events but it's
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* subviews can be. It behaves like if the view had the following classes
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* in CSS:
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* ```
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* .box-none {
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* pointer-events: none;
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* }
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* .box-none * {
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* pointer-events: all;
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* }
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* ```
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* - `'box-only'`: The view can be the target of touch events but it's
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* subviews cannot be. It behaves like if the view had the following classes
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* in CSS:
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* ```
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* .box-only {
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* pointer-events: all;
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* }
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* .box-only * {
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* pointer-events: none;
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* }
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* ```
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* > Since `pointerEvents` does not affect layout/appearance, and we are
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* > already deviating from the spec by adding additional modes, we opt to not
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* > include `pointerEvents` on `style`. On some platforms, we would need to
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* > implement it as a `className` anyways. Using `style` or not is an
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* > implementation detail of the platform.
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*/
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pointerEvents: PropTypes.oneOf([
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'box-none',
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'none',
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'box-only',
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'auto',
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]),
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style: stylePropType,
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/**
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* This is a special performance property exposed by `RCTView` and is useful
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* for scrolling content when there are many subviews, most of which are
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* offscreen. For this property to be effective, it must be applied to a
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* view that contains many subviews that extend outside its bound. The
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* subviews must also have `overflow: hidden`, as should the containing view
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* (or one of its superviews).
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*/
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removeClippedSubviews: PropTypes.bool,
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/**
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* Whether this `View` should render itself (and all of its children) into a
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* single hardware texture on the GPU.
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*
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* On Android, this is useful for animations and interactions that only
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* modify opacity, rotation, translation, and/or scale: in those cases, the
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* view doesn't have to be redrawn and display lists don't need to be
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* re-executed. The texture can just be re-used and re-composited with
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* different parameters. The downside is that this can use up limited video
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* memory, so this prop should be set back to false at the end of the
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* interaction/animation.
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*
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* @platform android
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*/
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renderToHardwareTextureAndroid: PropTypes.bool,
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/**
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* Whether this `View` should be rendered as a bitmap before compositing.
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*
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* On iOS, this is useful for animations and interactions that do not
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* modify this component's dimensions nor its children; for example, when
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* translating the position of a static view, rasterization allows the
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* renderer to reuse a cached bitmap of a static view and quickly composite
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* it during each frame.
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*
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* Rasterization incurs an off-screen drawing pass and the bitmap consumes
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* memory. Test and measure when using this property.
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*
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* @platform ios
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*/
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shouldRasterizeIOS: PropTypes.bool,
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/**
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* Views that are only used to layout their children or otherwise don't draw
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* anything may be automatically removed from the native hierarchy as an
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* optimization. Set this property to `false` to disable this optimization and
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* ensure that this `View` exists in the native view hierarchy.
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*
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* @platform android
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*/
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collapsable: PropTypes.bool,
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/**
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* Whether this `View` needs to rendered offscreen and composited with an alpha
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* in order to preserve 100% correct colors and blending behavior. The default
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* (`false`) falls back to drawing the component and its children with an alpha
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* applied to the paint used to draw each element instead of rendering the full
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* component offscreen and compositing it back with an alpha value. This default
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* may be noticeable and undesired in the case where the `View` you are setting
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* an opacity on has multiple overlapping elements (e.g. multiple overlapping
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* `View`s, or text and a background).
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*
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* Rendering offscreen to preserve correct alpha behavior is extremely
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* expensive and hard to debug for non-native developers, which is why it is
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* not turned on by default. If you do need to enable this property for an
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* animation, consider combining it with renderToHardwareTextureAndroid if the
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* view **contents** are static (i.e. it doesn't need to be redrawn each frame).
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* If that property is enabled, this View will be rendered off-screen once,
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* saved in a hardware texture, and then composited onto the screen with an alpha
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* each frame without having to switch rendering targets on the GPU.
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|
*
|
|
* @platform android
|
|
*/
|
|
needsOffscreenAlphaCompositing: PropTypes.bool,
|
|
},
|
|
|
|
render: function() {
|
|
// WARNING: This method will not be used in production mode as in that mode we
|
|
// replace wrapper component View with generated native wrapper RCTView. Avoid
|
|
// adding functionality this component that you'd want to be available in both
|
|
// dev and prod modes.
|
|
return <RCTView {...this.props} />;
|
|
},
|
|
});
|
|
|
|
const RCTView = requireNativeComponent('RCTView', View, {
|
|
nativeOnly: {
|
|
nativeBackgroundAndroid: true,
|
|
}
|
|
});
|
|
|
|
if (__DEV__) {
|
|
const viewConfig = UIManager.viewConfigs && UIManager.viewConfigs.RCTView || {};
|
|
for (const prop in viewConfig.nativeProps) {
|
|
const viewAny: any = View; // Appease flow
|
|
if (!viewAny.propTypes[prop] && !ReactNativeStyleAttributes[prop]) {
|
|
throw new Error(
|
|
'View is missing propType for native prop `' + prop + '`'
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
let ViewToExport = RCTView;
|
|
if (__DEV__) {
|
|
ViewToExport = View;
|
|
} else {
|
|
Object.assign(RCTView, statics);
|
|
}
|
|
|
|
module.exports = ViewToExport;
|