Accelerated React rendering of objects list for tracks (#6544)

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- [x] I submit my changes into the `develop` branch
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- [ ] I have updated the documentation accordingly
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([cvat-canvas](https://github.com/opencv/cvat/tree/develop/cvat-canvas#versioning),

[cvat-core](https://github.com/opencv/cvat/tree/develop/cvat-core#versioning),

[cvat-data](https://github.com/opencv/cvat/tree/develop/cvat-data#versioning)
and

[cvat-ui](https://github.com/opencv/cvat/tree/develop/cvat-ui#versioning))

### License

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https://github.com/opencv/cvat/blob/develop/LICENSE) that covers the
project.
  Feel free to contact the maintainers if that's a concern.

cvat-ui/src/components/annotation-page/standard-workspace/objects-side-bar/object-item.tsx

@@ -10,7 +10,6 @@ import Collapse from 'antd/lib/collapse';
 import ObjectButtonsContainer from 'containers/annotation-page/standard-workspace/objects-side-bar/object-buttons';
 import ItemDetailsContainer from 'containers/annotation-page/standard-workspace/objects-side-bar/object-item-details';
 import { ObjectType, ShapeType, ColorBy } from 'reducers';
-import { ObjectState } from 'cvat-core-wrapper';
 import ObjectItemElementComponent from './object-item-element';
 import ItemBasics from './object-item-basics';
 
@@ -25,7 +24,7 @@ interface Props {
     labelID: number;
     isGroundTruth: boolean;
     locked: boolean;
-    elements: any[];
+    elements: number[];
     color: string;
     colorBy: ColorBy;
     labels: any[];
@@ -141,29 +140,27 @@ function ObjectItemComponent(props: Props): JSX.Element {
                     />
                 )}
                 {!!elements.length && (
-                    <>
-                        <Collapse className='cvat-objects-sidebar-state-item-elements-collapse'>
-                            <Collapse.Panel
-                                header={(
-                                    <>
-                                        <Text style={{ fontSize: 10 }} type='secondary'>PARTS</Text>
-                                        <br />
-                                    </>
-                                )}
-                                key='elements'
-                            >
-                                {elements.map((element: ObjectState) => (
-                                    <ObjectItemElementComponent
-                                        key={element.clientID as number}
-                                        readonly={readonly}
-                                        parentID={clientID}
-                                        clientID={element.clientID as number}
-                                        onMouseLeave={activateState}
-                                    />
-                                ))}
-                            </Collapse.Panel>
-                        </Collapse>
-                    </>
+                    <Collapse className='cvat-objects-sidebar-state-item-elements-collapse'>
+                        <Collapse.Panel
+                            header={(
+                                <>
+                                    <Text style={{ fontSize: 10 }} type='secondary'>PARTS</Text>
+                                    <br />
+                                </>
+                            )}
+                            key='elements'
+                        >
+                            {elements.map((element: number) => (
+                                <ObjectItemElementComponent
+                                    key={element}
+                                    readonly={readonly}
+                                    parentID={clientID}
+                                    clientID={element}
+                                    onMouseLeave={activateState}
+                                />
+                            ))}
+                        </Collapse.Panel>
+                    </Collapse>
                 )}
             </div>
         </div>

cvat-ui/src/containers/annotation-page/canvas/canvas-context-menu.tsx

@@ -26,7 +26,7 @@ interface StateToProps {
     contextMenuParentID: number | null;
     contextMenuClientID: number | null;
     canvasInstance: Canvas | null;
-    objectStates: any[];
+    objectStates: ObjectState[];
     frameConflicts: QualityConflict[];
     visible: boolean;
     top: number;
@@ -155,7 +155,7 @@ class CanvasContextMenuContainer extends React.PureComponent<Props, State> {
         };
     }
 
-    static getDerivedStateFromProps(props: Props, state: State): State | null {
+    static getDerivedStateFromProps(props: Readonly<Props>, state: State): State | null {
         if (props.left === state.latestLeft && props.top === state.latestTop) {
             return null;
         }

cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/label-item.tsx

@@ -81,7 +81,7 @@ class LabelItemContainer extends React.PureComponent<Props, State> {
         };
     }
 
-    static getDerivedStateFromProps(props: Props, state: State): State | null {
+    static getDerivedStateFromProps(props: Readonly<Props>, state: State): State | null {
         if (props.objectStates === state.objectStates) {
             return null;
         }

cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/object-item.tsx

@@ -23,6 +23,7 @@ import {
 import ObjectStateItemComponent from 'components/annotation-page/standard-workspace/objects-side-bar/object-item';
 import { getColor } from 'components/annotation-page/standard-workspace/objects-side-bar/shared';
 import { shift } from 'utils/math';
+import { Label, ObjectState } from 'cvat-core-wrapper';
 import { Canvas, CanvasMode } from 'cvat-canvas-wrapper';
 import { Canvas3d } from 'cvat-canvas3d-wrapper';
 import { filterApplicableLabels } from 'utils/filter-applicable-labels';
@@ -128,7 +129,34 @@ function mapDispatchToProps(dispatch: any): DispatchToProps {
 }
 
 type Props = StateToProps & DispatchToProps & OwnProps;
-class ObjectItemContainer extends React.PureComponent<Props> {
+interface State {
+    labels: Label[];
+    elements: number[];
+}
+
+class ObjectItemContainer extends React.PureComponent<Props, State> {
+    public constructor(props: Props) {
+        super(props);
+        this.state = {
+            labels: props.labels,
+            elements: props.objectState.elements.map((el: ObjectState) => el.clientID),
+        };
+    }
+
+    public static getDerivedStateFromProps(props: Readonly<Props>, state: Readonly<State>): State | null {
+        const { objectState, labels } = props;
+        const applicableLabels = filterApplicableLabels(objectState, labels);
+        if (state.labels.length !== applicableLabels.length ||
+            state.labels.some((label, idx) => label.id !== applicableLabels[idx].id)) {
+            return {
+                ...state,
+                labels: applicableLabels,
+            };
+        }
+
+        return null;
+    }
+
     private copy = (): void => {
         const { objectState, readonly, copyShape } = this.props;
         if (!readonly) {
@@ -312,9 +340,9 @@ class ObjectItemContainer extends React.PureComponent<Props> {
     }
 
     public render(): JSX.Element {
+        const { labels, elements } = this.state;
         const {
             objectState,
-            labels,
             attributes,
             activated,
             colorBy,
@@ -323,8 +351,6 @@ class ObjectItemContainer extends React.PureComponent<Props> {
             jobInstance,
         } = this.props;
 
-        const applicableLabels = filterApplicableLabels(objectState, labels);
-
         return (
             <ObjectStateItemComponent
                 jobInstance={jobInstance}
@@ -339,9 +365,9 @@ class ObjectItemContainer extends React.PureComponent<Props> {
                 isGroundTruth={objectState.isGroundTruth}
                 color={getColor(objectState, colorBy)}
                 attributes={attributes}
-                elements={objectState.elements}
+                elements={elements}
                 normalizedKeyMap={normalizedKeyMap}
-                labels={applicableLabels}
+                labels={labels}
                 colorBy={colorBy}
                 activate={this.activate}
                 remove={this.remove}
@@ -354,7 +380,7 @@ class ObjectItemContainer extends React.PureComponent<Props> {
                 changeColor={this.changeColor}
                 changeLabel={this.changeLabel}
                 edit={this.edit}
-                resetCuboidPerspective={() => this.resetCuboidPerspective()}
+                resetCuboidPerspective={this.resetCuboidPerspective}
             />
         );
     }