Module popup 

Floating-panel behavior shared by <dropdown> and <menu>: outside-click dismissal and viewport edge-flip anchoring.

The markup parser wraps each panel in an <if eq="true" mode="hide"> keyed on a synthetic open signal (__dropdown_open:* / __menu_open:*) and tags the panel entity with PopupPanel. Two tiny systems then act on any open panel:

• dismiss_popups_on_outside_press closes a panel when a primary press lands outside both the panel’s subtree and its trigger.
• flip_open_dropdown_panels positions a dropdown panel just below its trigger, flipping above when the panel would overflow the viewport bottom - the same edge-flip rule crate::tooltip applies, factored into anchored_popup_origin.

Structs

PopupGap

Gap between a popup panel and the control that opens it, in logical pixels. Sits on the trigger entity.

PopupPanel

Marker on a <dropdown> / <menu> floating panel. Carries the open-state signal so the dismissal + edge-flip systems can query the panel by its bound signal.

Enums

PopupSide

Which side of the anchor a popup prefers on its primary axis.

Functions

anchored_popup_origin

Viewport-space top-left for a popup-sized box anchored to a trigger rect (anchor_pos / anchor_size), preferring side and flipping to the opposite side of the viewport when the preferred placement would overflow. gap px separate the popup from the anchor on the primary axis; the cross axis aligns to the anchor’s leading edge and also flips inward when it would overflow.

dismiss_popups_on_outside_press

Close any open PopupPanel when a primary press lands outside both the panel’s own subtree and (for dropdowns) its trigger header.

flip_open_dropdown_panels

Anchor each open dropdown panel below its trigger header, flipping it above when the panel’s bottom edge would fall past the viewport bottom. Runs after the first layout pass has measured the panel (mirrors the tooltip’s spawn-then-measure ordering).