Merge pull request leecade#831 from alattanzio/master

added scrollTo

src/index.js

@@ -503,6 +503,47 @@ export default class extends Component {
     }
   }
 
+  /**
+   * Scroll to index
+   * @param  {number} index page
+   * @param  {bool} animated
+   */
+
+  scrollTo = (index, animated = true) => {
+    if (this.internals.isScrolling || this.state.total < 2 || index == this.state.index) return
+
+    const state = this.state
+    const diff = this.state.index + (index - this.state.index)
+
+    let x = 0
+    let y = 0
+    if (state.dir === 'x') x = diff * state.width
+    if (state.dir === 'y') y = diff * state.height
+
+    if (Platform.OS !== 'ios') {
+      this.scrollView && this.scrollView[animated ? 'setPage' : 'setPageWithoutAnimation'](diff)
+    } else {
+      this.scrollView && this.scrollView.scrollTo({ x, y, animated })
+    }
+
+    // update scroll state
+    this.internals.isScrolling = true
+    this.setState({
+      autoplayEnd: false
+    })
+
+    // trigger onScrollEnd manually in android
+    if (!animated || Platform.OS !== 'ios') {
+      setImmediate(() => {
+        this.onScrollEnd({
+          nativeEvent: {
+            position: diff
+          }
+        })
+      })
+    }
+  }
+
   scrollViewPropOverrides = () => {
     const props = this.props
     let overrides = {}