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| 1 | +/** |
| 2 | + * The examples provided by Facebook are for non-commercial testing and |
| 3 | + * evaluation purposes only. |
| 4 | + * |
| 5 | + * Facebook reserves all rights not expressly granted. |
| 6 | + * |
| 7 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 8 | + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 9 | + * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL |
| 10 | + * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| 11 | + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 12 | + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 13 | + * |
| 14 | + * @flow |
| 15 | + */ |
| 16 | +'use strict'; |
| 17 | + |
| 18 | +var React = require('react-native'); |
| 19 | +var { |
| 20 | + StyleSheet, |
| 21 | + PanResponder, |
| 22 | + View, |
| 23 | +} = React; |
| 24 | + |
| 25 | +var CIRCLE_SIZE = 80; |
| 26 | +var CIRCLE_COLOR = 'blue'; |
| 27 | +var CIRCLE_HIGHLIGHT_COLOR = 'green'; |
| 28 | + |
| 29 | + |
| 30 | +var NavigatorIOSExample = React.createClass({ |
| 31 | + |
| 32 | + statics: { |
| 33 | + title: 'PanResponder Sample', |
| 34 | + description: 'Basic gesture handling example', |
| 35 | + }, |
| 36 | + |
| 37 | + _panResponder: {}, |
| 38 | + _previousLeft: 0, |
| 39 | + _previousTop: 0, |
| 40 | + _circleStyles: {}, |
| 41 | + circle: (null : ?{ setNativeProps(props: Object): void }), |
| 42 | + |
| 43 | + componentWillMount: function() { |
| 44 | + this._panResponder = PanResponder.create({ |
| 45 | + onStartShouldSetPanResponder: this._handleStartShouldSetPanResponder, |
| 46 | + onMoveShouldSetPanResponder: this._handleMoveShouldSetPanResponder, |
| 47 | + onPanResponderGrant: this._handlePanResponderGrant, |
| 48 | + onPanResponderMove: this._handlePanResponderMove, |
| 49 | + onPanResponderRelease: this._handlePanResponderEnd, |
| 50 | + onPanResponderTerminate: this._handlePanResponderEnd, |
| 51 | + }); |
| 52 | + this._previousLeft = 20; |
| 53 | + this._previousTop = 84; |
| 54 | + this._circleStyles = { |
| 55 | + left: this._previousLeft, |
| 56 | + top: this._previousTop, |
| 57 | + }; |
| 58 | + }, |
| 59 | + |
| 60 | + componentDidMount: function() { |
| 61 | + this._updatePosition(); |
| 62 | + }, |
| 63 | + |
| 64 | + render: function() { |
| 65 | + return ( |
| 66 | + <View |
| 67 | + style={styles.container}> |
| 68 | + <View |
| 69 | + ref={(circle) => { |
| 70 | + this.circle = circle; |
| 71 | + }} |
| 72 | + style={styles.circle} |
| 73 | + {...this._panResponder.panHandlers} |
| 74 | + /> |
| 75 | + </View> |
| 76 | + ); |
| 77 | + }, |
| 78 | + |
| 79 | + _highlight: function() { |
| 80 | + this.circle && this.circle.setNativeProps({ |
| 81 | + backgroundColor: CIRCLE_HIGHLIGHT_COLOR |
| 82 | + }); |
| 83 | + }, |
| 84 | + |
| 85 | + _unHighlight: function() { |
| 86 | + this.circle && this.circle.setNativeProps({ |
| 87 | + backgroundColor: CIRCLE_COLOR |
| 88 | + }); |
| 89 | + }, |
| 90 | + |
| 91 | + _updatePosition: function() { |
| 92 | + this.circle && this.circle.setNativeProps(this._circleStyles); |
| 93 | + }, |
| 94 | + |
| 95 | + _handleStartShouldSetPanResponder: function(e: Object, gestureState: Object): boolean { |
| 96 | + // Should we become active when the user presses down on the circle? |
| 97 | + return true; |
| 98 | + }, |
| 99 | + |
| 100 | + _handleMoveShouldSetPanResponder: function(e: Object, gestureState: Object): boolean { |
| 101 | + // Should we become active when the user moves a touch over the circle? |
| 102 | + return true; |
| 103 | + }, |
| 104 | + |
| 105 | + _handlePanResponderGrant: function(e: Object, gestureState: Object) { |
| 106 | + this._highlight(); |
| 107 | + }, |
| 108 | + _handlePanResponderMove: function(e: Object, gestureState: Object) { |
| 109 | + this._circleStyles.left = this._previousLeft + gestureState.dx; |
| 110 | + this._circleStyles.top = this._previousTop + gestureState.dy; |
| 111 | + this._updatePosition(); |
| 112 | + }, |
| 113 | + _handlePanResponderEnd: function(e: Object, gestureState: Object) { |
| 114 | + this._unHighlight(); |
| 115 | + this._previousLeft += gestureState.dx; |
| 116 | + this._previousTop += gestureState.dy; |
| 117 | + }, |
| 118 | +}); |
| 119 | + |
| 120 | +var styles = StyleSheet.create({ |
| 121 | + circle: { |
| 122 | + width: CIRCLE_SIZE, |
| 123 | + height: CIRCLE_SIZE, |
| 124 | + borderRadius: CIRCLE_SIZE / 2, |
| 125 | + backgroundColor: CIRCLE_COLOR, |
| 126 | + position: 'absolute', |
| 127 | + left: 0, |
| 128 | + top: 0, |
| 129 | + }, |
| 130 | + container: { |
| 131 | + flex: 1, |
| 132 | + paddingTop: 64, |
| 133 | + }, |
| 134 | +}); |
| 135 | + |
| 136 | +module.exports = NavigatorIOSExample; |
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