react-native-draggable

UPDATE DEC 2019 (v3.0.0) - This repo has just been completely refreshed and contains very different functionality, please see the new props and usage below

Draggable item for react-native!

npm install react-native-draggable
import Draggable from 'react-native-draggable';

How to use

return (
    <View >
        <Draggable x={75} y={100} renderSize={56} renderColor='black' renderText='A' isCircle shouldReverse onShortPressRelease={()=>alert('touched!!')}/> 
        <Draggable x={200} y={300} renderColor='red' renderText='B'/>
        <Draggable/>
	<Draggable x={50} y={50}>
		<YourComponent/>
	</Draggable>
    </View>
);

Demo

in my project =>

return (
    <View style={{backgroundColor: 'blue', flex: 1}} >
        <Draggable 
            imageSource={require('./trump1.png')} 
            renderSize={80} 
            x={200}
            y={300}
            onDragRelease={this._changeFace}
            onLongPress={()=>console.log('long press')}
            onShortPressRelease={()=>console.log('press drag')}
            onPressIn={()=>console.log('in press')}
            onPressOut={()=>console.log('out press')}
        />  
    </View>
);  

Event Demo

Version 3 Demo

Props spec & Example

Properties

Prop	Type	Example	Default	Description
renderText	string	'ANY'	'+'	text of draggable
isCircle	bool	{true}	---	render as circle
renderSize	number	{36}	{36}	draggable size
imageSource	source	require('./img/xxx.png')	---	image source
renderColor	string	'black'	---	Colors
children	Component	<Text>Sup</Text>	---	children to render as draggable
shouldReverse	bool	{false}	{false}	should draggable spring back to start when released
disabled	bool	{false}	{false}	should draggable be disabled
debug	bool	{false}	{false}	should show a debug visualization
touchableOpacityProps	Object	{ activeOpactiy: .1 }	---	props passed to TouchableOpacity component
animatedViewProps	Object	{ accessibilityHint: 'drag' }	---	props passed to Animated.View component
x	number	{0}	0	initial position x
y	number	{0}	0	initial position y
z	number	{1}	1	z-index / elevation
minX	number	{0}	---	min X value for left edge of component
minY	number	{0}	---	min Y value for top edge of component
maxX	number	{0}	---	max X value for right edge of component
maxY	number	{0}	---	max Y value for bottom edge of component

Events

Event	Type	Arguments	Description
onDrag	func	event, gestureState	called every frame component is moved
onShortPressRelease	func	event	called when a press is released that isn't a long press or drag
onDragRelease	func	event, gestureState, bounds	called when a drag is released
onLongPress	func	event	called when a long press is started
onPressIn	func	event	called when a press is started
onPressOut	func	event	called when a press is stopped, or the component is dragged
onRelease	func	event, wasDragging	called at the end of interaction, regardless if press or drag
onReverse	func		called when a drag is released, if shouldReverse is true

Arguments (event, gestureState)

event

Argument	Description
changedTouches	Array of all touch events that have changed since the last event
identifier	The ID of the touch
locationX	The X position of the touch, relative to the element
locationY	The Y position of the touch, relative to the element
pageX	The X position of the touch, relative to the root element
pageY	The Y position of the touch, relative to the root element
target	The node id of the element receiving the touch event
timestamp	A time identifier for the touch, useful for velocity calculation
touches	Array of all current touches on the screen

gestureState

Argument	Description
stateID	ID of the gestureState- persisted as long as there at least one touch on screen
moveX	the latest screen coordinates of the recently-moved touch
moveY	the latest screen coordinates of the recently-moved touch
x0	the screen coordinates of the responder grant
y0	the screen coordinates of the responder grant
dx	accumulated distance of the gesture since the touch started
dy	accumulated distance of the gesture since the touch started
vx	current velocity of the gesture
vy	current velocity of the gesture
numberActiveTouches	Number of touches currently on screen
gestureState	called at the end of interaction, regardless if press or drag

bounds

Argument	Description
left	as x at the top left corner
top	as y at the top left corner
right	as x at the bottom right corner
bottom	as y at the bottom right corner

Methods (not supported above V2.0.0)

Method	Params	Description
reversePosition	---	use onReverse callback instead. manually reset Draggable to start position
getPosition	---	use onDragRelease callback instead. get the accurate coordinates x,y from the bounds

What's next?

This Draggable is used to be a Draggable Button in my project. Let me know if you have any idea or demand, let's discuss and develop it.