css for hidden hint button

client/src/components/level.css

@@ -181,7 +181,7 @@ td code  {
 }
 
 .chat {
-  height: calc(100% - 3.5em);
+  flex: 1;
   overflow-y: scroll;
   margin-left: .5em;
   margin-right: .5em;
@@ -191,16 +191,26 @@ td code  {
   padding-top: 0;
   padding-bottom: 0;
   overflow: hidden;
+  display: flex;
+  flex-direction: column;
+
 }
 
-.toggle-hidden-hints {
+.chat-panel .button-row {
   /* width:100%; */
   margin-left: .5em;
   margin-right: .5em;
-  height: 3.5em;
+  min-height: 2.5em;
   border-top:  0.1em solid #aaa;
 }
 
+.chat-panel .btn {
+  margin-top: 1rem;
+  margin-bottom: 1rem;
+  margin-left: .5rem;
+  margin-right: .5rem;
+}
+
 /* .exercise-panel {
   display: flex;
   flex-flow: column;

client/src/components/level.tsx

@@ -252,10 +252,35 @@ function PlayableLevel({worldId, levelId}) {
     }
   }
 
+  function hasHiddenHints(i : number): boolean {
+    let step = proof[i]
+
+    // For example if the proof isn't loaded yet
+    if(!step) {return false}
+
+    return step.hints.some((hint) => hint.hidden)
+  }
+
   // If the last step has errors, we want to treat it as if it is part of the second-to-last step
   let k = proof.length - 1
   let withErr = hasInteractiveErrors(proof[k]?.errors) ? 1 : 0
 
+  const activateHiddenHints = (ev) => {
+    // If the last step (`k`) has errors, we want the hidden hints from the
+    // second-to-last step to be affected
+    if (!(proof.length)) {return}
+
+    // state must not be mutated, therefore we need to clone the set
+    let tmp = new Set(showHelp)
+    if (tmp.has(k - withErr)) {
+      tmp.delete(k - withErr)
+    } else {
+      tmp.add(k - withErr)
+    }
+    setShowHelp(tmp)
+    console.debug(`help: ${Array.from(tmp.values())}`)
+  }
+
   return <>
     <div style={level.isLoading ? null : {display: "none"}} className="app-content loading"><CircularProgress /></div>
     <DeletedChatContext.Provider value={{deletedChat, setDeletedChat, showHelp, setShowHelp}}>
@@ -292,32 +317,23 @@ function PlayableLevel({worldId, levelId}) {
                     <Markdown>{level?.data?.conclusion}</Markdown>
                   </div>
                 }
-                {levelId >= gameInfo.data?.worldSize[worldId] ?
-                <Button to={`/${gameId}`}><FontAwesomeIcon icon={faHome} /> Leave World</Button> :
-                <Button to={`/${gameId}/world/${worldId}/level/${levelId + 1}`}>
-                  Next&nbsp;<FontAwesomeIcon icon={faArrowRight} /></Button>}
               </>
             }
           </div>
-          <div className="toggle-hidden-hints">
-            <FormControlLabel
-              control={<Switch checked={showHelp.has(k - withErr)} onChange={(ev) => {
-                // If the last step (`k`) has errors, we want the hidden hints from the
-                // second-to-last step to be affected
-                if (!(proof.length)) {return}
-
-                // state must not be mutated, therefore we need to clone the set
-                let tmp = new Set(showHelp)
-                if (tmp.has(k - withErr)) {
-                  tmp.delete(k - withErr)
-                } else {
-                  tmp.add(k - withErr)
+          <div className="button-row">
+            {completed && (levelId >= gameInfo.data?.worldSize[worldId] ?
+              <Button to={`/${gameId}`}>
+                <FontAwesomeIcon icon={faHome} />&nbsp;Leave World
+              </Button> :
+              <Button to={`/${gameId}/world/${worldId}/level/${levelId + 1}`}>
+                Next&nbsp;<FontAwesomeIcon icon={faArrowRight} />
+              </Button>)
+              }
+            {hasHiddenHints(proof.length - 1) && !showHelp.has(k - withErr) &&
+              <Button to="" onClick={activateHiddenHints}>
+                Show more help!
+              </Button>
             }
-                setShowHelp(tmp)
-                console.debug(`help: ${Array.from(tmp.values())}`)
-              }} />}
-              label="Show more help!"
-            />
           </div>
         </div>
         <div className="exercise-panel">