feat: added scrollToAlignment property

* Expose List scrollToAlignment property

* Added definition for scrollToAlignment prop

* Added scrollToAlignment to TreeContainer

Author: wheelibin

index.d.ts

@@ -37,6 +37,7 @@ export interface TreeProps {
   nodeMarginLeft?: number;
   width?: number;
   scrollToId?: number;
+  scrollToAlignment?: string;
 }
 
 export default class Tree extends React.Component<TreeProps> {}

src/Tree.js

@@ -67,7 +67,7 @@ export default class Tree extends React.Component {
   };
 
   render() {
-    const {nodes, width, scrollToIndex} = this.props;
+    const {nodes, width, scrollToIndex, scrollToAlignment} = this.props;
 
     return (
       <AutoSizer disableWidth={Boolean(width)}>
@@ -81,6 +81,7 @@ export default class Tree extends React.Component {
             rowRenderer={this.measureRowRenderer(nodes)}
             width={width || autoWidth}
             scrollToIndex={scrollToIndex}
+            scrollToAlignment={scrollToAlignment}
           />
         )}
       </AutoSizer>
@@ -94,4 +95,6 @@ Tree.propTypes = {
   onChange: PropTypes.func.isRequired,
   nodeMarginLeft: PropTypes.number,
   width: PropTypes.number,
+  scrollToIndex: PropTypes.number,
+  scrollToAlignment: PropTypes.string,
 };

src/TreeContainer.js

@@ -52,6 +52,7 @@ export default class TreeContainer extends React.Component {
         onChange={this.handleChange}
         NodeRenderer={this.props.children}
         scrollToIndex={rowIndex}
+        scrollToAlignment={this.props.scrollToAlignment}
       />
     );
   }
@@ -67,6 +68,7 @@ TreeContainer.propTypes = {
   nodeMarginLeft: PropTypes.number,
   width: PropTypes.number,
   scrollToId: PropTypes.number,
+  scrollToAlignment: PropTypes.string,
 };
 
 TreeContainer.defaultProps = {