Created
July 12, 2021 16:06
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implementation of react-native-gesture-handler in clojurescript and react native (cljsrn) https://snack.expo.io/@adamgrzybowski/react-native-gesture-handler-demo
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;; It's very important to update main activity as per https://docs.swmansion.com/react-native-gesture-handler/docs/#updating-mainactivityjava | |
;; otherwise this example won't work | |
(ns test.app | |
(:require ["react-native-gesture-handler" :as gesture] | |
["react-native-reanimated" :as re-animated] | |
[shadow.react-native :refer (render-root)] | |
["react-native" :as rn] | |
[reagent.core :as r] | |
[goog.object :as goog-obj])) | |
(defn gget-in [m ks] | |
(goog-obj/getValueByKeys m (clj->js (map name ks)))) | |
(defn gkeys [obj] | |
(goog-obj/getKeys obj)) | |
(defn draggable-view-gesture [] | |
(let [x (new rn/Animated.Value 0) | |
y (new rn/Animated.Value 0) | |
last-offset (new rn/Animated.ValueXY #js {:x 0 | |
:y 0}) | |
gesture-handler (rn/Animated.event (clj->js [{:nativeEvent {:translationX x | |
:translationY y}}]) | |
(clj->js {:useNativeDriver true})) | |
state-handler (fn [event] | |
(if (= (gget-in event [:nativeEvent :oldState]) | |
gesture/State.ACTIVE) | |
(do | |
(.setValue ^js last-offset #js {:x (+ (gget-in last-offset [:x :_value]) (gget-in event [:nativeEvent :translationX])) | |
:y (+ (gget-in last-offset [:y :_value]) (gget-in event [:nativeEvent :translationY]))}) | |
(.setOffset ^js x (gget-in last-offset [:x :_value])) | |
(.setOffset ^js y (gget-in last-offset [:y :_value])) | |
(.setValue ^js x 0) | |
(.setValue ^js y 0))))] | |
(fn [] | |
[:> gesture/PanGestureHandler {:maxPointers 1 | |
:onGestureEvent gesture-handler | |
:onHandlerStateChange state-handler} | |
[:> rn/Animated.View {:style {:background-color "blue" | |
:height 100 | |
:width 100 | |
:transform [{:translateX x} | |
{:translateY y}]}}]]))) |
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