Radio buttons

res/css/_components.scss

@@ -118,6 +118,7 @@
 @import "./views/elements/_Slider.scss";
 @import "./views/elements/_Spinner.scss";
 @import "./views/elements/_StyledCheckbox.scss";
+@import "./views/elements/_StyledRadioButton.scss";
 @import "./views/elements/_SyntaxHighlight.scss";
 @import "./views/elements/_TextWithTooltip.scss";
 @import "./views/elements/_ToggleSwitch.scss";

res/css/views/elements/_StyledRadioButton.scss

@@ -0,0 +1,95 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/**
+* This component expects the parent to specify a positive padding and
+* width
+*/
+
+.mx_RadioButton {
+
+    $radio-circle-color: $muted-fg-color;
+    $active-radio-circle-color: $accent-color;
+    position: relative;
+
+    display: flex;
+    align-items: center;
+    flex-grow: 1;
+
+    > span {
+        flex-grow: 1;
+
+        display: flex;
+
+        margin-left: 10px;
+        margin-right: 10px;
+    }
+
+    .mx_RadioButton_spacer {
+        flex-shrink: 0;
+        flex-grow: 0;
+
+        height: $font-16px;
+        width: $font-16px;
+    }
+
+    > input[type=radio] {
+        // Remove the OS's representation
+        margin: 0;
+        padding: 0;
+        display: none;
+
+        + div {
+            flex-shrink: 0;
+            flex-grow: 0;
+
+            display: flex;
+            align-items: center;
+            justify-content: center;
+
+            box-sizing: border-box;
+            height: $font-16px;
+            width: $font-16px;
+
+            border: $font-1-5px solid $radio-circle-color;
+            border-radius: $font-16px;
+
+            > div {
+                box-sizing: border-box;
+
+                height: $font-8px;
+                width: $font-8px;
+
+                border-radius: $font-8px;
+            }
+        }
+    }
+
+    > input[type=radio]:checked {
+        + div {
+            border-color: $active-radio-circle-color;
+
+            > div {
+                background: $active-radio-circle-color;
+            }
+        }
+    }
+
+    > input[type=radio]:disabled {
+        + div {
+            > div {
+                display: none;
+            }
+        }
+    }
+}

src/components/views/elements/StyledRadioButton.tsx

@@ -0,0 +1,38 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+Licensed under the Apache License, Version 2.0 (the 'License');
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an 'AS IS' BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import classnames from 'classnames';
+
+interface IProps extends React.InputHTMLAttributes<HTMLInputElement> {
+}
+
+interface IState {
+}
+
+export default class StyledRadioButton extends React.PureComponent<IProps, IState> {
+    public static readonly defaultProps = {
+        className: '',
+    }
+
+    public render() {
+        const { children, className, ...otherProps } = this.props;
+        return <label className={classnames('mx_RadioButton', className)}>
+            <input type='radio' {...otherProps} />
+            {/* Used to render the radio button circle */}
+            <div><div></div></div>
+            <span>{children}</span>
+            <div className="mx_RadioButton_spacer" />
+        </label>
+    }
+}