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react-native-drag-and-drop's Introduction

React Native Drag And Drop

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  • Pan Responder - https://reactnative.dev/docs/panresponder

  • PanResponder reconciles several touches into a single gesture. It makes single-touch gestures resilient to extra touches, and can be used to recognize basic multi-touch gestures.

  • By default, PanResponder holds an InteractionManager handle to block long-running JS events from interrupting active gestures.

  • It provides a predictable wrapper of the responder handlers provided by the gesture responder system. For each handler, it provides a new gestureState object alongside the native event object:

onPanResponderMove: (event, gestureState) => {}
  • A native event is a synthetic touch event with form of PressEvent.

  • A gestureState object has the following:

  1. stateID - ID of the gestureState- persisted as long as there at least one touch on screen
  2. moveX - the latest screen coordinates of the recently-moved touch
  3. moveY - the latest screen coordinates of the recently-moved touch
  4. x0 - the screen coordinates of the responder grant
  5. y0 - the screen coordinates of the responder grant
  6. dx - accumulated distance of the gesture since the touch started
  7. dy - accumulated distance of the gesture since the touch started
  8. vx - current velocity of the gesture
  9. vy - current velocity of the gesture
  10. numberActiveTouches - Number of touches currently on screen
  • Example Component
const ExampleComponent = () => {
  const panResponder = React.useRef(
    PanResponder.create({
      // Ask to be the responder:
      onStartShouldSetPanResponder: (evt, gestureState) => true,
      onStartShouldSetPanResponderCapture: (evt, gestureState) =>
        true,
      onMoveShouldSetPanResponder: (evt, gestureState) => true,
      onMoveShouldSetPanResponderCapture: (evt, gestureState) =>
        true,

      onPanResponderGrant: (evt, gestureState) => {
        // The gesture has started. Show visual feedback so the user knows
        // what is happening!
        // gestureState.d{x,y} will be set to zero now
      },
      onPanResponderMove: (evt, gestureState) => {
        // The most recent move distance is gestureState.move{X,Y}
        // The accumulated gesture distance since becoming responder is
        // gestureState.d{x,y}
      },
      onPanResponderTerminationRequest: (evt, gestureState) =>
        true,
      onPanResponderRelease: (evt, gestureState) => {
        // The user has released all touches while this view is the
        // responder. This typically means a gesture has succeeded
      },
      onPanResponderTerminate: (evt, gestureState) => {
        // Another component has become the responder, so this gesture
        // should be cancelled
      },
      onShouldBlockNativeResponder: (evt, gestureState) => {
        // Returns whether this component should block native components from becoming the JS
        // responder. Returns true by default. Is currently only supported on android.
        return true;
      }
    })
  ).current;

  return <View {...panResponder.panHandlers} />;
};
  • Window.requestAnimationFrame()

The window.requestAnimationFrame() method tells the browser that you wish to perform an animation and requests that the browser calls a specified function to update an animation before the next repaint. The method takes a callback as an argument to be invoked before the repaint. https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame

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