Module floating 

panel — content that floats over a page and is dragged around it: a meter, an inspector, a detached preview.

The panel lays a full-size layer over its container and places the box inside it, because the drag has to be heard somewhere larger than the thing being dragged: a pointer that outruns a frame lands outside a box-sized hitbox, and the gesture stalls with the box stranded behind the cursor. crate::scroll hangs its thumb drag off the track for the same reason.

// The state is a field of the view that mounts it; the panel is one line.
div().relative().size_full()
    .child(page)
    .child(floating::panel("meter", &self.meter, home, self.stats.clone()))

It clamps nothing and remembers nothing across launches. A panel dragged half off the window stays there, and the point it was grabbed by is under the pointer, so it can always be dragged back.

Structs

Floating

Where a panel sits, and where inside it the pointer took hold. A field of the view that mounts the panel, like crate::scroll::ScrollbarState — and, for the same reason, carrying its own Painter: a drag runs in event-dispatch context, where the window cannot resolve which view is asking to be redrawn.

Functions

layer

A layer over a page: placed by the caller, and taking the mouse it covers.

panel

The panel: child floating where state left it, or at home until it is dragged. Mount it in a relative() container — it lays a layer over that container’s whole box.