fix camera movement

Author: nicoecheza

packages/@dcl/inspector/src/lib/babylon/decentraland/camera.ts

@@ -163,15 +163,25 @@ export class CameraManager {
       return false
     }
 
+    let isAltKeyDown = false
     scene.onPreKeyboardObservable.add((ev) => {
-      const isAltKeyDown = ev.type === BABYLON.KeyboardEventTypes.KEYDOWN && ev.event.inputIndex === Keys.KEY_ALT
+      const oldAltKeyState = isAltKeyDown
+      if (ev.type === BABYLON.KeyboardEventTypes.KEYDOWN && ev.event.inputIndex === Keys.KEY_ALT) {
+        isAltKeyDown = true
+      }
+
+      if (ev.type === BABYLON.KeyboardEventTypes.KEYUP && ev.event.inputIndex === Keys.KEY_ALT) {
+        isAltKeyDown = false
+      }
 
       if (isAltKeyDown) {
         mouseInput.buttons = [LEFT_BUTTON, RIGHT_BUTTON] // move camera with left/right mouse buttons
       } else {
         mouseInput.buttons = [RIGHT_BUTTON] // move camera with right mouse button only
-        // reattach control to avoid camera sticking to the pointer bug...
-        this.reattachControl()
+        if (oldAltKeyState) {
+          // reattach control to avoid camera sticking to the pointer bug...
+          this.reattachControl()
+        }
       }
     })
 

packages/@dcl/inspector/src/lib/babylon/setup/input.ts

@@ -14,6 +14,7 @@ export function initKeyboard(canvas: HTMLCanvasElement, scene: BABYLON.Scene) {
   canvas.addEventListener('keydown', (e) => {
     keyState[Keys.KEY_SHIFT] = e.shiftKey
     keyState[Keys.KEY_CTRL] = e.ctrlKey
+    keyState[Keys.KEY_ALT] = e.altKey
     keyState[e.keyCode] = true
     if (e.shiftKey) {
       isSnapEnabled = snapManager.toggle()
@@ -29,13 +30,15 @@ export function initKeyboard(canvas: HTMLCanvasElement, scene: BABYLON.Scene) {
 
     keyState[Keys.KEY_SHIFT] = e.shiftKey
     keyState[Keys.KEY_CTRL] = e.ctrlKey
+    keyState[Keys.KEY_ALT] = e.altKey
     keyState[e.keyCode] = false
   })
 
   // When the canvas lost the focus, clear the special keys state
   canvas.addEventListener('blur', () => {
     keyState[Keys.KEY_SHIFT] = false
     keyState[Keys.KEY_CTRL] = false
+    keyState[Keys.KEY_ALT] = false
   })
 
   // Event to store the ctrlKey when the canvas has lost the focus