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import { useState, useEffect, useCallback } from "react";
interface UseSelectionBoxProps {
containerRef: React.RefObject<HTMLElement>;
playheadRef?: React.RefObject<HTMLElement>;
onSelectionComplete: (
elements: { trackId: string; elementId: string }[],
) => void;
isEnabled?: boolean;
}
interface SelectionBoxState {
startPos: { x: number; y: number };
currentPos: { x: number; y: number };
isActive: boolean;
}
export function useSelectionBox({
containerRef,
playheadRef,
onSelectionComplete,
isEnabled = true,
}: UseSelectionBoxProps) {
const [selectionBox, setSelectionBox] = useState<SelectionBoxState | null>(
null,
);
const [justFinishedSelecting, setJustFinishedSelecting] = useState(false);
// Mouse down handler to start selection
const handleMouseDown = useCallback(
(e: React.MouseEvent) => {
if (!isEnabled) return;
// Only start selection on empty space clicks
if ((e.target as HTMLElement).closest(".timeline-element")) {
return;
}
if (playheadRef?.current?.contains(e.target as Node)) {
return;
}
if ((e.target as HTMLElement).closest("[data-track-labels]")) {
return;
}
// Don't start selection when clicking in the ruler area - this interferes with playhead dragging
if ((e.target as HTMLElement).closest("[data-ruler-area]")) {
return;
}
setSelectionBox({
startPos: { x: e.clientX, y: e.clientY },
currentPos: { x: e.clientX, y: e.clientY },
isActive: false, // Will become active when mouse moves
});
},
[isEnabled, playheadRef],
);
// Function to select elements within the selection box
const selectElementsInBox = useCallback(
(startPos: { x: number; y: number }, endPos: { x: number; y: number }) => {
if (!containerRef.current) return;
const container = containerRef.current;
const containerRect = container.getBoundingClientRect();
// Calculate selection rectangle in container coordinates
const startX = startPos.x - containerRect.left;
const startY = startPos.y - containerRect.top;
const endX = endPos.x - containerRect.left;
const endY = endPos.y - containerRect.top;
const selectionRect = {
left: Math.min(startX, endX),
top: Math.min(startY, endY),
right: Math.max(startX, endX),
bottom: Math.max(startY, endY),
};
// Find all timeline elements within the selection rectangle
const timelineElements = container.querySelectorAll(".timeline-element");
const selectedElements: { trackId: string; elementId: string }[] = [];
timelineElements.forEach((element) => {
const elementRect = element.getBoundingClientRect();
// Use absolute coordinates for more accurate intersection detection
const elementAbsolute = {
left: elementRect.left,
top: elementRect.top,
right: elementRect.right,
bottom: elementRect.bottom,
};
const selectionAbsolute = {
left: startPos.x,
top: startPos.y,
right: endPos.x,
bottom: endPos.y,
};
// Normalize selection rectangle (handle dragging in any direction)
const normalizedSelection = {
left: Math.min(selectionAbsolute.left, selectionAbsolute.right),
top: Math.min(selectionAbsolute.top, selectionAbsolute.bottom),
right: Math.max(selectionAbsolute.left, selectionAbsolute.right),
bottom: Math.max(selectionAbsolute.top, selectionAbsolute.bottom),
};
const elementId = element.getAttribute("data-element-id");
const trackId = element.getAttribute("data-track-id");
// Check if element intersects with selection rectangle (any overlap)
// Using absolute coordinates for more precise detection
const intersects = !(
elementAbsolute.right < normalizedSelection.left ||
elementAbsolute.left > normalizedSelection.right ||
elementAbsolute.bottom < normalizedSelection.top ||
elementAbsolute.top > normalizedSelection.bottom
);
if (intersects && elementId && trackId) {
selectedElements.push({ trackId, elementId });
}
});
// Always call the callback - with elements or empty array to clear selection
console.log(
JSON.stringify({ selectElementsInBox: selectedElements.length }),
);
onSelectionComplete(selectedElements);
},
[containerRef, onSelectionComplete],
);
// Effect to track selection box movement
useEffect(() => {
if (!selectionBox) return;
const handleMouseMove = (e: MouseEvent) => {
const deltaX = Math.abs(e.clientX - selectionBox.startPos.x);
const deltaY = Math.abs(e.clientY - selectionBox.startPos.y);
// Start selection if mouse moved more than 5px
const shouldActivate = deltaX > 5 || deltaY > 5;
const newSelectionBox = {
...selectionBox,
currentPos: { x: e.clientX, y: e.clientY },
isActive: shouldActivate || selectionBox.isActive,
};
setSelectionBox(newSelectionBox);
// Real-time visual feedback: update selection as we drag
if (newSelectionBox.isActive) {
selectElementsInBox(
newSelectionBox.startPos,
newSelectionBox.currentPos,
);
}
};
const handleMouseUp = () => {
console.log(
JSON.stringify({ mouseUp: { wasActive: selectionBox?.isActive } }),
);
// If we had an active selection, mark that we just finished selecting
if (selectionBox?.isActive) {
console.log(JSON.stringify({ settingJustFinishedSelecting: true }));
setJustFinishedSelecting(true);
// Clear the flag after a short delay to allow click events to check it
setTimeout(() => {
console.log(JSON.stringify({ clearingJustFinishedSelecting: true }));
setJustFinishedSelecting(false);
}, 50);
}
// Don't call selectElementsInBox again - real-time selection already handled it
// Just clean up the selection box visual
setSelectionBox(null);
};
window.addEventListener("mousemove", handleMouseMove);
window.addEventListener("mouseup", handleMouseUp);
return () => {
window.removeEventListener("mousemove", handleMouseMove);
window.removeEventListener("mouseup", handleMouseUp);
};
}, [selectionBox, selectElementsInBox]);
return {
selectionBox,
handleMouseDown,
isSelecting: selectionBox?.isActive || false,
justFinishedSelecting,
};
}
|
