Tweak topbar button styling

Prevent images from being dragged.
Add HelpModal with placeholder content.
Make icons for ConnectionConfigButton.
Extract ConnectionConfigButton to TopbarButton, then add another one
that opens the HelpModal.

src/renderer/App.css

@@ -3,7 +3,7 @@ body {
 }
 
 .App {
-  --window-head-color: blue;
+  --window-head-color: navy;
   --window-head-text-color: white;
   --window-accent-color: grey;
   --body-color: white;
@@ -32,7 +32,7 @@ body {
   z-index: 20;
   backdrop-filter: blur(2px);
 }
-.App-modal-container:has(.modal-active) {
+.App-modal-container:has(.Modal-active) {
   display: block;
 }
 .App-confirm-dialog-text {

src/renderer/App.tsx

@@ -17,6 +17,7 @@ import ConfirmModal from './modals/ConfirmModal';
 import ConnectionConfigModal, {
   ConnectionConfigChangeEvent,
 } from './modals/ConnectionConfigModal';
+import HelpModal from './modals/HelpModal';
 import GamepadInfoModal from './modals/GamepadInfoModal';
 import ResizeBar from './ResizeBar';
 import {
@@ -403,6 +404,7 @@ export default function App() {
           onConnectionConfigModalOpen={() =>
             changeActiveModal('ConnectionConfig')
           }
+          onHelpModalOpen={() => changeActiveModal('Help')}
           dawnVersion={dawnVersion}
           robotLatencyMs={robotLatencyMs}
           robotBatteryVoltage={robotBatteryVoltage}
@@ -471,6 +473,7 @@ export default function App() {
             FieldIPAddress={FieldIPAddress}
             FieldStationNum={FieldStationNum}
           />
+          <HelpModal isActive={activeModal === 'Help'} onClose={closeModal} />
           <GamepadInfoModal
             isActive={activeModal === 'GamepadInfo'}
             onClose={closeModal}

src/renderer/Editor.css

@@ -95,6 +95,7 @@
   transition: filter 0.25s;
   /* Fix other filter variables so transition is directly from black to blue: */
   filter: invert(0%) sepia(100%) hue-rotate(180deg) saturate(0);
+  pointer-events: none;
 }
 .Editor-tbbtn-toggled img {
   /* CSS filter witchcraft producing #0088ff */

src/renderer/Topbar.css

@@ -16,9 +16,6 @@
 .Topbar-right-group {
   float: right;
 }
-.Topbar-tail {
-  clear: both;
-}
 .Topbar-dawn-version {
   font-size: 25px;
   margin-right: 40px;
@@ -32,6 +29,7 @@
   font-weight: bold;
   font-size: 15px;
 }
+
 .Topbar-robot-disconnected {
   background-color: indianred;
 }

src/renderer/Topbar.tsx

@@ -1,4 +1,7 @@
-import ConnectionConfigButton from './ConnectionConfigButton';
+import TopbarButton from './TopbarButton';
+import questionSvg from '../../assets/question.svg';
+import connectionSvg from '../../assets/network.svg';
+import noConnectionSvg from '../../assets/no-network.svg';
 import './Topbar.css';
 
 const GOOD_BATTERY_VOLTAGE = 11;
@@ -11,6 +14,7 @@ const FAIR_LATENCY_MS = 200;
  * @param props - props
  * @param props.onConnectionConfigModalOpen - handler called when the ConnectionConfigModal should
  * be opened
+ * @param props.onHelpModalOpen - handler called when the HelpModal should be opened
  * @param props.robotLatencyMs - latency in milliseconds of the connection to the currently
  * connected robot, or -1 if there is no robot connected
  * @param props.robotBatteryVoltage - battery voltage in volts of the currently connected robot. The
@@ -19,11 +23,13 @@ const FAIR_LATENCY_MS = 200;
  */
 export default function Topbar({
   onConnectionConfigModalOpen,
+  onHelpModalOpen,
   robotBatteryVoltage,
   robotLatencyMs,
   dawnVersion,
 }: {
   onConnectionConfigModalOpen: () => void;
+  onHelpModalOpen: () => void;
   robotBatteryVoltage: number;
   robotLatencyMs: number;
   dawnVersion: string;
@@ -66,9 +72,17 @@ export default function Topbar({
         {robotInfo}
       </div>
       <div className="Topbar-right-group">
-        <ConnectionConfigButton onModalOpen={onConnectionConfigModalOpen} />
+        <TopbarButton
+          onModalOpen={onHelpModalOpen}
+          alt="Dawn and robot API help"
+          src={questionSvg}
+        />
+        <TopbarButton
+          onModalOpen={onConnectionConfigModalOpen}
+          alt="Connection configuration"
+          src={robotLatencyMs === -1 ? noConnectionSvg : connectionSvg}
+        />
       </div>
-      <div className="Topbar-tail" />
     </div>
   );
 }

src/renderer/TopbarButton.css

@@ -0,0 +1,18 @@
+.TopbarButton {
+  height: 100%;
+}
+.TopbarButton button {
+  background-color: transparent;
+  border: none;
+  outline: none;
+  cursor: pointer;
+}
+.TopbarButton img {
+  height: 25px;
+  border: 3px solid lightgray;
+  border-radius: 6px;
+  pointer-events: none;
+}
+.TopbarButton button:active img {
+  border-color: gray;
+}

src/renderer/TopbarButton.tsx

@@ -0,0 +1,26 @@
+import './TopbarButton.css';
+
+/**
+ * Image button component in the Topbar that opens a modal.
+ * @param props - props
+ * @param props.onModalOpen - click handler for the button that opens the ConnectionConfigModal
+ * @param props.src - source of the image
+ * @param props.alt - string to use as the image alt text and button hover text
+ */
+export default function TopbarButton({
+  onModalOpen,
+  src,
+  alt,
+}: {
+  onModalOpen: () => void;
+  src: string;
+  alt: string;
+}) {
+  return (
+    <div className="TopbarButton">
+      <button type="button" onClick={onModalOpen} title={alt}>
+        <img src={src} alt={alt} />
+      </button>
+    </div>
+  );
+}

src/renderer/modals/HelpModal.tsx

@@ -0,0 +1,23 @@
+import Modal from './Modal';
+
+/**
+ * Modal component displaying help for Dawn and the robot API.
+ * @param props - props
+ * @param props.onClose - handler called when the modal is closed by any means
+ * @param props.isActive - whether to display the modal
+ */
+export default function GamepadInfoModal({
+  onClose,
+  isActive,
+}: {
+  onClose: () => void;
+  isActive: boolean;
+}) {
+  return (
+    <Modal modalTitle="Help" onClose={onClose} isActive={isActive}>
+      This is a very helpful message. So helpful, in fact, that it&apos;s too
+      helpful to even write here. Its helpfulness would blind your eyes with its
+      brilliance.
+    </Modal>
+  );
+}

src/renderer/modals/Modal.css

@@ -6,8 +6,9 @@
   transform: translate(-50%, -50%);
   background-color: var(--body-color);
   border-radius: 10px;
+  font-family: Arial, sans-serif;
 }
-.modal-active {
+.Modal-active {
   display: block;
 }
 .Modal-title-bar {

src/renderer/modals/Modal.tsx

@@ -23,7 +23,7 @@ export default function Modal({
   className?: string;
 }) {
   return (
-    <div className={`Modal${isActive ? ' modal-active' : ''}`}>
+    <div className={`Modal${isActive ? ' Modal-active' : ''}`}>
       <div className="Modal-title-bar">
         <span className="Modal-title">{modalTitle}</span>
         <button className="Modal-close-button" onClick={onClose} type="button">