Register a callback invoked on every double-click over the plot area.
The payload is the HoverInfo for the cursor position, or null when
the cursor is outside the plot. Additive only — the chart's built-in
double-click handlers (fit / reset price scale) are unaffected.
Register a callback invoked on every snap-to-candle hover.
Set crosshair mode. In
'magnet'mode the horizontal line snaps to the nearest OHLC level of the candle under the cursor;'normal'follows the raw cursor Y.