easier tab closing in sqllab (#4738)

superset/assets/javascripts/SqlLab/components/TabStatusIcon.jsx

@@ -0,0 +1,42 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const propTypes = {
+  onClose: PropTypes.func.isRequired,
+  tabState: PropTypes.string.isRequired,
+};
+
+class TabStatusIcon extends React.Component {
+  constructor(props) {
+    super(props);
+    this.onMouseOver = this.onMouseOver.bind(this);
+    this.onMouseOut = this.onMouseOut.bind(this);
+
+    this.state = { isHovered: false };
+  }
+
+  onMouseOver() {
+    this.setState({ isHovered: true });
+  }
+
+  onMouseOut() {
+    this.setState({ isHovered: false });
+  }
+
+  render() {
+    return (
+      <span
+        onMouseOver={this.onMouseOver}
+        onMouseOut={this.onMouseOut}
+        onClick={this.props.onClose}
+      >
+        <div className={'circle ' + this.props.tabState}>
+          {this.state.isHovered ? '×' : null}
+        </div>
+      </span>
+    );
+  }
+}
+
+TabStatusIcon.propTypes = propTypes;
+export default TabStatusIcon;