Merge branch 'RuanLucasGD-locked_focus'

Source/Editor/Options/InputOptions.cs

@@ -60,6 +60,10 @@ namespace FlaxEditor.Options
         [EditorDisplay("Common"), EditorOrder(200)]
         public InputBinding FocusSelection = new InputBinding(KeyboardKeys.F);
 
+        [DefaultValue(typeof(InputBinding), "Shift+F")]
+        [EditorDisplay("Common"), EditorOrder(200)]
+        public InputBinding LockFocusSelection = new InputBinding(KeyboardKeys.F, KeyboardKeys.Shift);
+
         [DefaultValue(typeof(InputBinding), "Ctrl+F")]
         [EditorDisplay("Common"), EditorOrder(210)]
         public InputBinding Search = new InputBinding(KeyboardKeys.F, KeyboardKeys.Control);

Source/Editor/Viewport/MainEditorGizmoViewport.cs

@@ -133,6 +133,8 @@ namespace FlaxEditor.Viewport
             }
         }
 
+        private bool _lockedFocus;
+        private double _lockedFocusOffset;
         private readonly ViewportDebugDrawData _debugDrawData = new ViewportDebugDrawData(32);
         private StaticModel _previewStaticModel;
         private int _previewModelEntryIndex;
@@ -386,11 +388,43 @@ namespace FlaxEditor.Viewport
             InputActions.Add(options => options.TranslateMode, () => TransformGizmo.ActiveMode = TransformGizmoBase.Mode.Translate);
             InputActions.Add(options => options.RotateMode, () => TransformGizmo.ActiveMode = TransformGizmoBase.Mode.Rotate);
             InputActions.Add(options => options.ScaleMode, () => TransformGizmo.ActiveMode = TransformGizmoBase.Mode.Scale);
+            InputActions.Add(options => options.LockFocusSelection, LockFocusSelection);
             InputActions.Add(options => options.FocusSelection, FocusSelection);
             InputActions.Add(options => options.RotateSelection, RotateSelection);
             InputActions.Add(options => options.Delete, _editor.SceneEditing.Delete);
         }
 
+        /// <inheritdoc />
+        public override void Update(float deltaTime)
+        {
+            base.Update(deltaTime);
+
+            var selection = TransformGizmo.SelectedParents;
+            var requestUnlockFocus = FlaxEngine.Input.Mouse.GetButtonDown(MouseButton.Right) || FlaxEngine.Input.Mouse.GetButtonDown(MouseButton.Left);
+            if (TransformGizmo.SelectedParents.Count == 0 || (requestUnlockFocus && ContainsFocus))
+            {
+                UnlockFocusSelection();
+            }
+            else if (_lockedFocus)
+            {
+                var selectionBounds = BoundingSphere.Empty;
+                for (int i = 0; i < selection.Count; i++)
+                {
+                    selection[i].GetEditorSphere(out var sphere);
+                    BoundingSphere.Merge(ref selectionBounds, ref sphere, out selectionBounds);
+                }
+
+                if (ContainsFocus)
+                {
+                    var viewportFocusDistance = Vector3.Distance(ViewPosition, selectionBounds.Center) / 10f;
+                    _lockedFocusOffset -= FlaxEngine.Input.Mouse.ScrollDelta * viewportFocusDistance;
+                }
+
+                var focusDistance = Mathf.Max(selectionBounds.Radius * 2d, 100d);
+                ViewPosition = selectionBounds.Center + (-ViewDirection * (focusDistance + _lockedFocusOffset));
+            }
+        }
+
         /// <summary>
         /// Overrides the selection outline effect or restored the default one.
         /// </summary>
@@ -753,6 +787,23 @@ namespace FlaxEditor.Viewport
             FocusSelection(ref orientation);
         }
 
+        /// <summary>
+        /// Lock focus on the current selection gizmo.
+        /// </summary>
+        public void LockFocusSelection()
+        {
+            _lockedFocus = true;
+        }
+
+        /// <summary>
+        /// Unlock focus on the current selection.
+        /// </summary>
+        public void UnlockFocusSelection()
+        {
+            _lockedFocus = false;
+            _lockedFocusOffset = 0f;
+        }
+
         /// <summary>
         /// Focuses the viewport on the current selection of the gizmo.
         /// </summary>