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 manifest, stacks are available as the stack: item (see manifest format).