The panel's size when collapsed. A number is in pixels; a string can use %, px, rem, em, vh or vw.

Whether the panel collapses to collapsedSize when dragged well below minSize (past halfway to collapsedSize), or when the handle after it is double-clicked.

The panel's size at first. When no panel sets one, the space is split evenly. A number is in pixels; a string can use %, px, rem, em, vh or vw.

Whether the user is prevented from resizing this panel. panelRef can still resize it.

What happens to the panel when the whole group changes size: preserve-relative-size keeps its share of the group, preserve-pixel-size keeps its width or height in pixels.

A stable id for the panel. Set it when the group has a storageKey, so the saved layout is matched to the right panels.

The largest size the user can drag the panel to. A number is in pixels; a string can use %, px, rem, em, vh or vw.

The smallest size the user can drag the panel to. A number is in pixels; a string can use %, px, rem, em, vh or vw.

Called when the panel collapses.

Called when the panel expands from collapsed.

Called with the panel's new size, as a percentage of the group and in pixels, whenever it changes.

A ref to control the panel from code: collapse(), expand(), resize(size), isCollapsed(), isExpanded() and getSize().

The size of each panel at first, in order. Takes precedence over each panel's defaultSize. A number is in pixels; a string can use %, px, rem, em, vh or vw.

Whether the panels sit side by side (horizontal) or stacked (vertical).

Whether the user is prevented from resizing any panel.

A ref to read and set the whole layout from code, with getLayout() and setLayout(layout). Sizes are percentages.

Called with each panel's size, as a percentage of the group, whenever the layout changes, including on every step of a drag.

Called with each panel's size, as a percentage of the group, once the user finishes a resize: at the end of a drag, on a key press or on a double-click.

Where to save the layout when storageKey is set, instead of localStorage.

A key to save the layout under, so it comes back on the next visit. Saved to localStorage unless you pass storage. Give each panel an id so the saved layout survives changes to the page.