Add slide animation view.

src/common/SlideAnimationView.js

@@ -0,0 +1,39 @@
+/* flow */
+import React, { Component } from 'react';
+import { Animated } from 'react-native';
+
+export default class SlideAnimationView extends Component {
+  state = {
+    animationIndex: new Animated.Value(0),
+  };
+
+  animate() {
+    const { easing, duration } = this.props;
+    this.state.animationIndex.setValue(0);
+    Animated.timing(this.state.animationIndex, {
+      toValue: 1,
+      duration,
+      easing,
+      useNativeDriver: true,
+    }).start();
+  }
+
+  componentWillReceiveProps() {
+    this.animate();
+  }
+
+  render() {
+    const { property, from, to, movement, style } = this.props;
+    const animationValue = this.state.animationIndex.interpolate({
+      inputRange: [0, 1],
+      outputRange: movement === 'out' ? [from, to] : [to, from],
+    });
+
+    const slideStyle = { transform: [{ [property]: animationValue }] };
+    return (
+      <Animated.View style={[style, slideStyle]}>
+        {this.props.children}
+      </Animated.View>
+    );
+  }
+}

src/common/index.js

@@ -19,3 +19,4 @@ export { default as UserStatusIndicator } from './UserStatusIndicator';
 export { default as ZulipButton } from './ZulipButton';
 export { default as ZulipStatusBar } from './ZulipStatusBar';
 export { default as ZulipSwitch } from './ZulipSwitch';
+export { default as SlideAnimationView } from './SlideAnimationView';