From 55fab3d98f8714d09906745922b59afbdc0de00d Mon Sep 17 00:00:00 2001
From: fragosti <francesco.agosti93@gmail.com>
Date: Tue, 28 Aug 2018 15:07:29 -0700
Subject: Revert "Simplify dropdown component"

This reverts commit 91a9014a50cca8e0d42634666fe409839aeae8cf.
---
 packages/website/ts/components/ui/drop_down.tsx | 40 +++++++++++++++----------
 1 file changed, 25 insertions(+), 15 deletions(-)

diff --git a/packages/website/ts/components/ui/drop_down.tsx b/packages/website/ts/components/ui/drop_down.tsx
index 752c92e02..4d5caef08 100644
--- a/packages/website/ts/components/ui/drop_down.tsx
+++ b/packages/website/ts/components/ui/drop_down.tsx
@@ -25,7 +25,6 @@ export interface DropDownProps {
 
 interface DropDownState {
     isDropDownOpen: boolean;
-    isHovering: boolean;
     anchorEl?: HTMLInputElement;
 }
 
@@ -36,21 +35,11 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
         activateEvent: DropdownMouseEvent.Hover,
         closeEvent: DropdownMouseEvent.Hover,
     };
+    private _isHovering: boolean;
     private _popoverCloseCheckIntervalId: number;
-    public static getDerivedStateFromProps(props: DropDownProps, state: DropDownState): Partial<DropDownState> {
-        switch (props.activateEvent) {
-            case DropdownMouseEvent.Click:
-                return { isDropDownOpen: state.isDropDownOpen };
-            case DropdownMouseEvent.Hover:
-                return { isDropDownOpen: state.isHovering };
-            default:
-                return {};
-        }
-    }
     constructor(props: DropDownProps) {
         super(props);
         this.state = {
-            isHovering: false,
             isDropDownOpen: false,
         };
     }
@@ -62,6 +51,15 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
     public componentWillUnmount(): void {
         window.clearInterval(this._popoverCloseCheckIntervalId);
     }
+    public componentWillReceiveProps(_nextProps: DropDownProps): void {
+        // HACK: If the popoverContent is updated to a different dimension and the users
+        // mouse is no longer above it, the dropdown can enter an inconsistent state where
+        // it believes the user is still hovering over it. In order to remedy this, we
+        // call hoverOff whenever the dropdown receives updated props. This is a hack
+        // because it will effectively close the dropdown on any prop update, barring
+        // dropdowns from having dynamic content.
+        this._onHoverOff();
+    }
     public render(): React.ReactNode {
         return (
             <div
@@ -100,16 +98,28 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
         }
     }
     private _onHover(event: React.FormEvent<HTMLInputElement>): void {
-        this.setState({ isHovering: true });
+        this._isHovering = true;
+        if (this.props.activateEvent === DropdownMouseEvent.Hover) {
+            this._checkIfShouldOpenPopover(event);
+        }
     }
     private _onHoverOff(): void {
-        this.setState({ isHovering: false });
+        this._isHovering = false;
+    }
+    private _checkIfShouldOpenPopover(event: React.FormEvent<HTMLInputElement>): void {
+        if (this.state.isDropDownOpen) {
+            return; // noop
+        }
+        this.setState({
+            isDropDownOpen: true,
+            anchorEl: event.currentTarget,
+        });
     }
     private _checkIfShouldClosePopover(): void {
         if (!this.state.isDropDownOpen) {
             return; // noop
         }
-        if (this.props.closeEvent === DropdownMouseEvent.Hover && !this.state.isHovering) {
+        if (this.props.closeEvent === DropdownMouseEvent.Hover && !this._isHovering) {
             this._closePopover();
         }
     }
-- 
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