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import type { CellCoordinate } from "../types";
import { get_range_selection } from "../utils/selection_utils";
export type DragState = {
is_dragging: boolean;
drag_start: CellCoordinate | null;
mouse_down_pos: { x: number; y: number } | null;
};
export type DragHandlers = {
handle_mouse_down: (event: MouseEvent, row: number, col: number) => void;
handle_mouse_move: (event: MouseEvent) => void;
handle_mouse_up: (event: MouseEvent) => void;
};
export function create_drag_handlers(
state: DragState,
set_is_dragging: (value: boolean) => void,
set_selected_cells: (cells: CellCoordinate[]) => void,
set_selected: (cell: CellCoordinate | false) => void,
handle_cell_click: (event: MouseEvent, row: number, col: number) => void,
show_row_numbers: boolean,
parent_element?: HTMLElement
): DragHandlers {
const start_drag = (event: MouseEvent, row: number, col: number): void => {
const target = event.target as HTMLElement;
const is_checkbox_click =
(target as HTMLInputElement).type === "checkbox" ||
target.closest('input[type="checkbox"]') ||
target.closest(".bool-cell");
if (
event.target instanceof HTMLAnchorElement ||
(show_row_numbers && col === -1) ||
is_checkbox_click
)
return;
event.preventDefault();
event.stopPropagation();
state.mouse_down_pos = { x: event.clientX, y: event.clientY };
state.drag_start = [row, col];
if (!event.shiftKey && !event.metaKey && !event.ctrlKey) {
set_selected_cells([[row, col]]);
set_selected([row, col]);
handle_cell_click(event, row, col);
}
};
const update_selection = (event: MouseEvent): void => {
const cell = (event.target as HTMLElement).closest("td");
if (!cell) return;
const row = parseInt(cell.getAttribute("data-row") || "0");
const col = parseInt(cell.getAttribute("data-col") || "0");
if (isNaN(row) || isNaN(col)) return;
const selection_range = get_range_selection(state.drag_start!, [row, col]);
set_selected_cells(selection_range);
set_selected([row, col]);
};
const end_drag = (event: MouseEvent): void => {
if (!state.is_dragging && state.drag_start) {
handle_cell_click(event, state.drag_start[0], state.drag_start[1]);
} else if (state.is_dragging && parent_element) {
parent_element.focus();
}
state.is_dragging = false;
set_is_dragging(false);
state.drag_start = null;
state.mouse_down_pos = null;
};
return {
handle_mouse_down: start_drag,
handle_mouse_move(event: MouseEvent): void {
if (!state.drag_start || !state.mouse_down_pos) return;
if (!(event.buttons & 1)) {
end_drag(event);
return;
}
const dx = Math.abs(event.clientX - state.mouse_down_pos.x);
const dy = Math.abs(event.clientY - state.mouse_down_pos.y);
if (!state.is_dragging && (dx > 3 || dy > 3)) {
state.is_dragging = true;
set_is_dragging(true);
}
if (state.is_dragging) {
update_selection(event);
}
},
handle_mouse_up: end_drag
};
}
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