Relayout

apps/video.js

             signal({kind: 'rpc-needed', value: {kind: 'video', target}})
         })
     },
+    reLayout({dom}) {
+        const COUNT = dom.children.length || 1
+        let [fnx, fny] = [
+            Math.floor((1 + Math.sqrt(4 * COUNT - 3)) / 2),
+            Math.ceil(Math.sqrt(COUNT)),
+        ]
+        let max = 0
+        for([nx, ny] of [[1, COUNT], [fnx, fny], [COUNT, 1]]) {
+            let h = dom.clientHeight / ny
+            let w = dom.clientWidth / nx
+            if(w > h) {
+                w = Math.min(w, h * 4/3)
+            }
+            else {
+                h = Math.min(h, w * 3/4)
+            }
+            if(h * w > max) {
+                max = h * w
+                fnx = nx
+                fny = ny
+            }
+        }
+        dom.style['grid-template-columns'] = Array(fnx).fill('1fr').join(' ')
+        dom.style['grid-template-rows'] = Array(fny).fill('1fr').join(' ')
+    },
     view() {
-        const dims = [
-            Math.floor((1 + Math.sqrt(4 * State.online.length - 3)) / 2),
-            Math.ceil(Math.sqrt(State.online.length)),
-        ].map(n => Array(n || 1).fill('1fr').join(' '))
-
-        if(innerHeight > innerWidth) dims.reverse()
         const style = {
             backgroundColor: 'black',
             overflow: 'hidden',
             display: 'grid',
-            gridTemplateRows: dims[0],
-            gridTemplateColumns: dims[1],
         }
-        return m('.videos', {style},
+        const oncreate = VideoShare.reLayout
+        const onupdate = VideoShare.reLayout
+        return m('.videos', {style, oncreate, onupdate},
             State.online.map(username => m(Video, {key: username, username}))
         )
     },