1 files changed, 71 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/components/shared/Dropdown.js b/devtools/client/debugger/src/components/shared/Dropdown.js
new file mode 100644
index 0000000000..7051cec9c5
--- /dev/null
+++ b/devtools/client/debugger/src/components/shared/Dropdown.js
@@ -0,0 +1,71 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import React, { Component } from "react";
+import PropTypes from "prop-types";
+import "./Dropdown.css";
+
+export class Dropdown extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      dropdownShown: false,
+    };
+  }
+
+  static get propTypes() {
+    return {
+      icon: PropTypes.node.isRequired,
+      panel: PropTypes.node.isRequired,
+    };
+  }
+
+  toggleDropdown = e => {
+    this.setState(prevState => ({
+      dropdownShown: !prevState.dropdownShown,
+    }));
+  };
+
+  renderPanel() {
+    return (
+      <div
+        className="dropdown"
+        onClick={this.toggleDropdown}
+        style={{ display: this.state.dropdownShown ? "block" : "none" }}
+      >
+        {this.props.panel}
+      </div>
+    );
+  }
+
+  renderButton() {
+    return (
+      <button className="dropdown-button" onClick={this.toggleDropdown}>
+        {this.props.icon}
+      </button>
+    );
+  }
+
+  renderMask() {
+    return (
+      <div
+        className="dropdown-mask"
+        onClick={this.toggleDropdown}
+        style={{ display: this.state.dropdownShown ? "block" : "none" }}
+      />
+    );
+  }
+
+  render() {
+    return (
+      <div className="dropdown-block">
+        {this.renderPanel()}
+        {this.renderButton()}
+        {this.renderMask()}
+      </div>
+    );
+  }
+}
+
+export default Dropdown;