|
| 1 | +--- |
| 2 | +sidebar_label: 'View Events (macOS)' |
| 3 | +sidebar_position: 2 |
| 4 | +--- |
| 5 | + |
| 6 | +# View Events (macOS) |
| 7 | + |
| 8 | +React Native macOS extends the standard React Native View component with additional events that are specific to macOS. These events allow you to respond to macOS-specific user interactions such as keyboard input, mouse movements, drag and drop operations, and more. |
| 9 | + |
| 10 | +## Events |
| 11 | + |
| 12 | +### `onBlur` |
| 13 | + |
| 14 | +Fired when the view loses focus. |
| 15 | + |
| 16 | +**Event Data:** Standard focus event |
| 17 | + |
| 18 | +This event is useful for implementing custom focus management and validation logic when a view loses keyboard focus. |
| 19 | + |
| 20 | +--- |
| 21 | + |
| 22 | +### `onDoubleClick` |
| 23 | + |
| 24 | +Fired when the user double-clicks on the view. |
| 25 | + |
| 26 | +**Event Data:** Mouse event with the following properties: |
| 27 | +- `clientX`: Horizontal position in the target view |
| 28 | +- `clientY`: Vertical position in the target view |
| 29 | +- `screenX`: Horizontal position in the window |
| 30 | +- `screenY`: Vertical position in the window |
| 31 | +- `altKey`: Whether Alt/Option key is pressed |
| 32 | +- `ctrlKey`: Whether Control key is pressed |
| 33 | +- `shiftKey`: Whether Shift key is pressed |
| 34 | +- `metaKey`: Whether Command key is pressed |
| 35 | + |
| 36 | +Example: |
| 37 | +```javascript |
| 38 | +<View onDoubleClick={(event) => { |
| 39 | + console.log('Double clicked at', event.nativeEvent.clientX, event.nativeEvent.clientY); |
| 40 | +}}> |
| 41 | + <Text>Double click me</Text> |
| 42 | +</View> |
| 43 | +``` |
| 44 | + |
| 45 | +--- |
| 46 | + |
| 47 | +### `onDragEnter` |
| 48 | + |
| 49 | +Fired when a drag operation enters the view's bounds. |
| 50 | + |
| 51 | +**Event Data:** Drag event with mouse position and data transfer information |
| 52 | + |
| 53 | +This event is fired when the user drags content over the view. Use this to provide visual feedback that the view can accept the dragged content. |
| 54 | + |
| 55 | +--- |
| 56 | + |
| 57 | +### `onDragLeave` |
| 58 | + |
| 59 | +Fired when a drag operation leaves the view's bounds. |
| 60 | + |
| 61 | +**Event Data:** Drag event with mouse position and data transfer information |
| 62 | + |
| 63 | +This event is fired when the user drags content away from the view. Use this to remove any visual feedback shown during drag enter. |
| 64 | + |
| 65 | +--- |
| 66 | + |
| 67 | +### `onDrop` |
| 68 | + |
| 69 | +Fired when the user drops content onto the view. |
| 70 | + |
| 71 | +**Event Data:** Drag event with the following properties: |
| 72 | +- Mouse position (`clientX`, `clientY`, `screenX`, `screenY`) |
| 73 | +- Modifier keys (`altKey`, `ctrlKey`, `shiftKey`, `metaKey`) |
| 74 | +- `dataTransfer`: Object containing: |
| 75 | + - `files`: Array of dropped files, each with: |
| 76 | + - `name`: File name |
| 77 | + - `type`: MIME type |
| 78 | + - `uri`: File URI |
| 79 | + - `size`: File size (optional) |
| 80 | + - `width`: Image width (optional, for images) |
| 81 | + - `height`: Image height (optional, for images) |
| 82 | + - `items`: Array of data transfer items, each with: |
| 83 | + - `kind`: Item kind (e.g., 'file', 'string') |
| 84 | + - `type`: MIME type |
| 85 | + - `types`: Array of available data types |
| 86 | + |
| 87 | +Example: |
| 88 | +```javascript |
| 89 | +<View |
| 90 | + draggedTypes={['public.file-url']} |
| 91 | + onDrop={(event) => { |
| 92 | + const files = event.nativeEvent.dataTransfer.files; |
| 93 | + files.forEach(file => { |
| 94 | + console.log('Dropped file:', file.name, file.uri); |
| 95 | + }); |
| 96 | + }} |
| 97 | +> |
| 98 | + <Text>Drop files here</Text> |
| 99 | +</View> |
| 100 | +``` |
| 101 | + |
| 102 | +--- |
| 103 | + |
| 104 | +### `onFocus` |
| 105 | + |
| 106 | +Fired when the view receives focus. |
| 107 | + |
| 108 | +**Event Data:** Standard focus event |
| 109 | + |
| 110 | +This event is useful for implementing custom focus management and showing focus-specific UI elements. |
| 111 | + |
| 112 | +--- |
| 113 | + |
| 114 | +### `onKeyDown` |
| 115 | + |
| 116 | +Fired when a key is pressed while the view has focus. |
| 117 | + |
| 118 | +**Event Data:** Key event with the following properties: |
| 119 | +- `key`: The key value (aligned with [W3C UI Events](https://www.w3.org/TR/uievents-key/)) |
| 120 | +- `altKey`: Whether Alt/Option key is pressed |
| 121 | +- `ctrlKey`: Whether Control key is pressed |
| 122 | +- `shiftKey`: Whether Shift key is pressed |
| 123 | +- `metaKey`: Whether Command key is pressed |
| 124 | +- `capsLockKey`: Whether Caps Lock is active |
| 125 | +- `numericPadKey`: Whether the key is on the numeric keypad |
| 126 | +- `helpKey`: Whether Help key is pressed |
| 127 | +- `functionKey`: Whether a function key is pressed |
| 128 | + |
| 129 | +:::note |
| 130 | +To receive key events, the view must have `focusable={true}` set, and you should specify which keys to handle using the `keyDownEvents` prop. |
| 131 | +::: |
| 132 | + |
| 133 | +Example: |
| 134 | +```javascript |
| 135 | +<View |
| 136 | + focusable={true} |
| 137 | + keyDownEvents={[ |
| 138 | + { key: 'Enter' }, |
| 139 | + { key: 's', metaKey: true } |
| 140 | + ]} |
| 141 | + onKeyDown={(event) => { |
| 142 | + const { key, metaKey } = event.nativeEvent; |
| 143 | + if (key === 'Enter') { |
| 144 | + console.log('Enter pressed'); |
| 145 | + } else if (key === 's' && metaKey) { |
| 146 | + console.log('Command+S pressed'); |
| 147 | + } |
| 148 | + }} |
| 149 | +> |
| 150 | + <Text>Press Enter or Cmd+S</Text> |
| 151 | +</View> |
| 152 | +``` |
| 153 | + |
| 154 | +--- |
| 155 | + |
| 156 | +### `onKeyUp` |
| 157 | + |
| 158 | +Fired when a key is released while the view has focus. |
| 159 | + |
| 160 | +**Event Data:** Key event (same format as `onKeyDown`) |
| 161 | + |
| 162 | +:::note |
| 163 | +To receive key events, the view must have `focusable={true}` set, and you should specify which keys to handle using the `keyUpEvents` prop. |
| 164 | +::: |
| 165 | + |
| 166 | +--- |
| 167 | + |
| 168 | +### `onMouseEnter` |
| 169 | + |
| 170 | +Fired when the mouse cursor enters the view's bounds. |
| 171 | + |
| 172 | +**Event Data:** Mouse event with the following properties: |
| 173 | +- `clientX`: Horizontal position in the target view |
| 174 | +- `clientY`: Vertical position in the target view |
| 175 | +- `screenX`: Horizontal position in the window |
| 176 | +- `screenY`: Vertical position in the window |
| 177 | +- `altKey`: Whether Alt/Option key is pressed |
| 178 | +- `ctrlKey`: Whether Control key is pressed |
| 179 | +- `shiftKey`: Whether Shift key is pressed |
| 180 | +- `metaKey`: Whether Command key is pressed |
| 181 | + |
| 182 | +Example: |
| 183 | +```javascript |
| 184 | +<View onMouseEnter={(event) => { |
| 185 | + console.log('Mouse entered at', event.nativeEvent.clientX, event.nativeEvent.clientY); |
| 186 | +}}> |
| 187 | + <Text>Hover over me</Text> |
| 188 | +</View> |
| 189 | +``` |
| 190 | + |
| 191 | +--- |
| 192 | + |
| 193 | +### `onMouseLeave` |
| 194 | + |
| 195 | +Fired when the mouse cursor leaves the view's bounds. |
| 196 | + |
| 197 | +**Event Data:** Mouse event (same format as `onMouseEnter`) |
| 198 | + |
| 199 | +Example: |
| 200 | +```javascript |
| 201 | +<View |
| 202 | + onMouseEnter={() => setIsHovered(true)} |
| 203 | + onMouseLeave={() => setIsHovered(false)} |
| 204 | + style={{ backgroundColor: isHovered ? 'lightblue' : 'white' }} |
| 205 | +> |
| 206 | + <Text>Hover state example</Text> |
| 207 | +</View> |
| 208 | +``` |
| 209 | + |
| 210 | +--- |
| 211 | + |
| 212 | +## Complete Example |
| 213 | + |
| 214 | +Here's a comprehensive example showing multiple macOS-specific events: |
| 215 | + |
| 216 | +```javascript |
| 217 | +import React, { useState } from 'react'; |
| 218 | +import { View, Text, StyleSheet } from 'react-native'; |
| 219 | + |
| 220 | +function MacOSEventsExample() { |
| 221 | + const [status, setStatus] = useState('Ready'); |
| 222 | + const [isHovered, setIsHovered] = useState(false); |
| 223 | + |
| 224 | + return ( |
| 225 | + <View style={styles.container}> |
| 226 | + <View |
| 227 | + style={[ |
| 228 | + styles.interactiveView, |
| 229 | + isHovered && styles.hoveredView |
| 230 | + ]} |
| 231 | + focusable={true} |
| 232 | + enableFocusRing={true} |
| 233 | + draggedTypes={['public.file-url', 'public.text']} |
| 234 | + keyDownEvents={[ |
| 235 | + { key: 'Enter' }, |
| 236 | + { key: 'Escape' } |
| 237 | + ]} |
| 238 | + onFocus={() => setStatus('Focused')} |
| 239 | + onBlur={() => setStatus('Blurred')} |
| 240 | + onKeyDown={(e) => setStatus(`Key down: ${e.nativeEvent.key}`)} |
| 241 | + onKeyUp={(e) => setStatus(`Key up: ${e.nativeEvent.key}`)} |
| 242 | + onMouseEnter={(e) => { |
| 243 | + setIsHovered(true); |
| 244 | + setStatus(`Mouse entered at (${e.nativeEvent.clientX}, ${e.nativeEvent.clientY})`); |
| 245 | + }} |
| 246 | + onMouseLeave={() => { |
| 247 | + setIsHovered(false); |
| 248 | + setStatus('Mouse left'); |
| 249 | + }} |
| 250 | + onDoubleClick={() => setStatus('Double clicked!')} |
| 251 | + onDragEnter={() => setStatus('Drag entered')} |
| 252 | + onDragLeave={() => setStatus('Drag left')} |
| 253 | + onDrop={(e) => { |
| 254 | + const files = e.nativeEvent.dataTransfer.files; |
| 255 | + setStatus(`Dropped ${files.length} file(s)`); |
| 256 | + }} |
| 257 | + > |
| 258 | + <Text>Interactive macOS View</Text> |
| 259 | + <Text style={styles.statusText}>{status}</Text> |
| 260 | + </View> |
| 261 | + </View> |
| 262 | + ); |
| 263 | +} |
| 264 | + |
| 265 | +const styles = StyleSheet.create({ |
| 266 | + container: { |
| 267 | + flex: 1, |
| 268 | + justifyContent: 'center', |
| 269 | + alignItems: 'center', |
| 270 | + }, |
| 271 | + interactiveView: { |
| 272 | + width: 300, |
| 273 | + height: 200, |
| 274 | + backgroundColor: 'white', |
| 275 | + borderWidth: 2, |
| 276 | + borderColor: 'gray', |
| 277 | + padding: 20, |
| 278 | + }, |
| 279 | + hoveredView: { |
| 280 | + backgroundColor: 'lightblue', |
| 281 | + }, |
| 282 | + statusText: { |
| 283 | + marginTop: 10, |
| 284 | + fontStyle: 'italic', |
| 285 | + }, |
| 286 | +}); |
| 287 | + |
| 288 | +export default MacOSEventsExample; |
| 289 | +``` |
| 290 | + |
| 291 | +## See Also |
| 292 | + |
| 293 | +- [View Props (macOS)](./view-props.md) - macOS-specific props for View components |
| 294 | +- [React Native View Component](https://reactnative.dev/docs/view) - Base View component documentation |
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