From f14e12f78561fcffa43b87cd6f8405118fb2c1a3 Mon Sep 17 00:00:00 2001
From: Sebastian Silbermann <silbermann.sebastian@gmail.com>
Date: Thu, 21 Feb 2019 15:11:13 +0100
Subject: [PATCH] [ExpansionPanel] Add context

---
 .../ExpansionPanel/ExpansionPanelContext.js    | 18 ++++++++++++++++++
 .../material-ui/src/ExpansionPanel/index.js    |  1 +
 .../src/ExpansionPanel/useExpansionPanel.d.ts  | 11 +++++++++++
 .../src/ExpansionPanel/useExpansionPanel.js    |  6 ++++++
 4 files changed, 36 insertions(+)
 create mode 100644 packages/material-ui/src/ExpansionPanel/ExpansionPanelContext.js
 create mode 100644 packages/material-ui/src/ExpansionPanel/useExpansionPanel.d.ts
 create mode 100644 packages/material-ui/src/ExpansionPanel/useExpansionPanel.js

diff --git a/packages/material-ui/src/ExpansionPanel/ExpansionPanelContext.js b/packages/material-ui/src/ExpansionPanel/ExpansionPanelContext.js
new file mode 100644
index 00000000000000..b02367c1d9d484
--- /dev/null
+++ b/packages/material-ui/src/ExpansionPanel/ExpansionPanelContext.js
@@ -0,0 +1,18 @@
+import React from 'react';
+import warning from 'warning';
+
+const ExpansionPanelContext = React.createContext({
+  disabled: false,
+  expanded: false,
+  onChange: () => {
+    warning(
+      false,
+      [
+        'Material-UI: You called onChange from a component  that is not a child of a ',
+        'ExpansionPanel component.',
+      ].join(''),
+    );
+  },
+});
+
+export default ExpansionPanelContext;
diff --git a/packages/material-ui/src/ExpansionPanel/index.js b/packages/material-ui/src/ExpansionPanel/index.js
index 323f2104b6c6f7..5d7e7b6af11d2f 100644
--- a/packages/material-ui/src/ExpansionPanel/index.js
+++ b/packages/material-ui/src/ExpansionPanel/index.js
@@ -1 +1,2 @@
 export { default } from './ExpansionPanel';
+export { default as useExpansionPanel } from './useExpansionPanel';
diff --git a/packages/material-ui/src/ExpansionPanel/useExpansionPanel.d.ts b/packages/material-ui/src/ExpansionPanel/useExpansionPanel.d.ts
new file mode 100644
index 00000000000000..7ef1363e6e99e3
--- /dev/null
+++ b/packages/material-ui/src/ExpansionPanel/useExpansionPanel.d.ts
@@ -0,0 +1,11 @@
+import * as React from 'react';
+
+interface ExpansionPanelContext<ChangeEvent> {
+  disabled: boolean;
+  expanded: boolean;
+  onChange: (event: Event, expanded: boolean) => void;
+}
+
+export default function useExpansionPanel<
+  ChangeEvent = React.SyntheticEvent
+>(): ExpansionPanelContext<ChangeEvent>;
diff --git a/packages/material-ui/src/ExpansionPanel/useExpansionPanel.js b/packages/material-ui/src/ExpansionPanel/useExpansionPanel.js
new file mode 100644
index 00000000000000..d2b2fcdae4d4fc
--- /dev/null
+++ b/packages/material-ui/src/ExpansionPanel/useExpansionPanel.js
@@ -0,0 +1,6 @@
+import React from 'react';
+import ExpansionPanelContext from './ExpansionPanelContext';
+
+export default function useExpansionPanel() {
+  return React.useContext(ExpansionPanelContext);
+}