Stacks
Vertical stacks
Stack2D lays out screen primitives below one another with uniform spacing, the whole block centered on a single handle. The layout is recomputed every frame, so it follows drag edits of the handle and size changes of the children (hot-reloaded latex...).
auto stack = Stack2D::Add("column"); // label handle : draggable as one unit
show << stack->at("column");
stack->addChild(paragraph1);
show << stack->place(paragraph1);
stack->addChild(paragraph2);
show << inNextFrame << stack->place(paragraph2); // registered now :
// space is reserved
The layout is computed from all registered children, visible or not: a child appearing at a later step fades in at its final position, and earlier children never move.
The stack draws nothing itself; it exists as a screen primitive so that arrows and englobing boxes can target the whole block.
| Field | Effect |
|---|---|
spacing |
vertical gap between children, relative units |
align |
LEFT, CENTER or RIGHT |
handle |
block center; a label makes the block drag-editable |
In a deck, stacks are the stack: item, below.