React dnd too many re-renders with custom drag layer, react.memo - reactjs

Question

My drag and drop is very slow because of too many re-renders.
React.memo doesn't seem to help although I passed all items as primitives.
My list looks as follows:
const TabList = ({ selectedTabsState, handleItemSelect, windowId, windowIndex, tabs, actions }) => {
const { dragTabs } = actions;
const moveTabs = ({ dragWindowId, dragTabIndex, hoverWindowId, hoverTabIndex, draggedTabs }) => {
dragTabs({
fromWindowId: dragWindowId,
dragTabIndex,
toWindowId: hoverWindowId,
hoverTabIndex,
draggedTabs
});
};
const ref = useRef(null);
// We need this to fix the bug that results from moving tabs from one window to a previous
const [, drop] = useDrop({
accept: ItemTypes.TAB,
hover(item, monitor) {
if (!ref.current) {
return
}
const dragWindowId = item.windowId;
const dragTabIndex = item.tabIndex;
const hoverWindowId = windowId;
if (hoverWindowId > dragWindowId) {
return;
}
const hoverTabIndex = tabs.length;
moveTabs({ dragWindowId, dragTabIndex, hoverWindowId, hoverTabIndex, draggedTab: item.tab });
item.windowId = hoverWindowId;
item.tabIndex = hoverTabIndex;
}
});
drop(ref);
const renderTab = (tab, index) => {
const isSelected = selectedTabsState.selectedTabs.find(selectedTab => selectedTab.id === tab.id);
return (
<TabListItem
key={`tab_${windowId}_${tab.id}`}
windowId={windowId}
windowIndex={windowIndex}
tabIndex={index}
isSelected={ isSelected }
moveTabs={moveTabs}
handleItemSelection={ handleItemSelect }
tabId={ tab.id }
tabUrl={ tab.url }
tabTitle={ tab.title }
/>)
};
return (
<li>
<ul className="nested-list">
{ tabs.map((tab, index) => renderTab(tab, index)) }
</ul>
<div ref={ ref } className='nested-list-bottom'></div>
</li>
);
};
const mapDispatchToProps = (dispatch) => {
return {
actions: bindActionCreators(
Object.assign({}, CurrentWindowsActions)
, dispatch)
}
};
const mapStateToProps = state => {
return {
selectedTabsState: state.selectedTabs
};
};
export default connect(mapStateToProps, mapDispatchToProps)(TabList);
My list item looks as follows:
const collect = (connect, monitor) => ({
// Call this function inside render()
// to let React DnD handle the drag events:
connectDragSource: connect.dragSource(),
// You can ask the monitor about the current drag preview
connectDragPreview: connect.dragPreview(),
// You can ask the monitor about the current drag state:
isDragging: monitor.isDragging(),
});
// We use dragSource to add custom isDragging
/* const tabSource = {
beginDrag({ selectedTabsState }) {
return { selectedTabs: selectedTabsState.selectedTabs };
}
}; */ // --> this is also problematic... I can never pass selectedTabsState to the item to be used in the drag layer, because it will re-render all items as well, and it is required to be passed as parameter to DragSource.
const tabSource = {
beginDrag() {
return {selectedTabs: [{id: 208}]};
}
};
const TabListItem = React.memo(
({ connectDragPreview, isSelected, handleItemSelection, connectDragSource, isDragging, windowId, windowIndex, tabId, tabUrl, tabTitle, tabIndex, moveTabs }) => {
useEffect(() => {
// Use empty image as a drag preview so browsers don't draw it
// and we can draw whatever we want on the custom drag layer instead.
connectDragPreview(getEmptyImage(), {
// IE fallback: specify that we'd rather screenshot the node
// when it already knows it's being dragged so we can hide it with CSS.
captureDraggingState: true
});
}, []);
const ref = useRef(null);
const [, drop] = useDrop({
accept: ItemTypes.TAB,
hover(item, monitor) {
if (!ref.current) {
return
}
const dragWindowId = item.windowId;
const dragTabIndex = item.tabIndex;
const hoverWindowId = windowId;
const hoverTabIndex = tabIndex;
// Don't replace items with themselves
if (dragTabIndex === hoverTabIndex && dragWindowId === hoverWindowId) {
return
}
// Determine rectangle on screen
const hoverBoundingRect = ref.current.getBoundingClientRect();
// Get vertical middle
const hoverMiddleY =
(hoverBoundingRect.bottom - hoverBoundingRect.top) / 2;
// Determine mouse position
const clientOffset = monitor.getClientOffset();
// Get pixels to the top
const hoverClientY = clientOffset.y - hoverBoundingRect.top;
// Only perform the move when the mouse has crossed half of the items height
// When dragging downwards, only move when the cursor is below 50%
// When dragging upwards, only move when the cursor is above 50%
// Dragging downwards
if (dragTabIndex < hoverTabIndex && hoverClientY < hoverMiddleY) {
return
}
// Dragging upwards
if (dragTabIndex > hoverTabIndex && hoverClientY > hoverMiddleY) {
return
}
// Time to actually perform the action
moveTabs({ dragWindowId, dragTabIndex, hoverWindowId, hoverTabIndex, draggedTabs: item.selectedTabs });
// Note: we're mutating the monitor item here!
// Generally it's better to avoid mutations,
// but it's good here for the sake of performance
// to avoid expensive index searches.
item.tabIndex = hoverTabIndex;
}
});
drop(ref);
console.log('render');
return connectDragSource(
<li ref={ ref }
style={ getTabStyle(isDragging, isSelected) }
onClick={(e) => handleItemSelection(e.metaKey, e.shiftKey, tabId, tabIndex)}
>
<div className='nested-list-item'>
<div>{ tabTitle }</div>
<a className='url' target="_blank" href={tabUrl}>{tabUrl}</a>
</div>
</li>
);
});
export default DragSource(ItemTypes.TAB, tabSource, collect)(TabListItem);
The code only drags selected items at a time (this must be shown in the custom drag layer); it doesn't throw exceptions (it works), but it is slow as hell.
In my console I can see that the item is rendered 48 times, which is the number of list items I have. This makes the drag very choppy and would become increasingly choppy with more list items.
Any idea why React.memo doesn't work in my case?
Edit: I found that part of the choppiness comes from the fact that drop-hover code is not correctly calculated anymore when it concerns multiple list items being dragged. Doesn't take away the fact that it shouldn't need to re-render all list-items on dragging just a few.

Answer 1

I'm not sure why the re-renders of all items still happen despite using React.memo, but I got rid of the choppiness by fixing the following code:
const tabSource = {
beginDrag({ selectedTabsState, windowId, tabIndex }) {
return { windowId, tabIndex, selectedTabs: selectedTabsState.selectedTabs };
}
};
This caused the drag-hover calculation to trigger too many state updates, followed by a ton of re-renders when redux updated the state.