PopupLocation

PopupLocation is a term used in graphical user interfaces to describe where a popup element should appear on the screen. A popup may be a tooltip, a context menu, a dropdown, or a floating panel, and PopupLocation specifies the position and alignment of that element relative to a reference element or to the screen.

Position is typically defined in one of several coordinate systems: relative to a reference control (anchor-based positioning), relative to the viewport or page coordinates, or relative to the screen. Common attributes include an anchor element, x and y offsets, and alignment options such as top, bottom, left, right, or center. Some implementations express the location with terms like gravity, anchorPoint, or edge alignment.

PopupLocation often works with collision handling, ensuring the popup remains visible by adjusting coordinates when the initial position would render it off-screen. It may also respond to changes in the layout, such as window resizing or scrolling. Accessibility considerations include ensuring the popup receives focus when shown and can be dismissed with keyboard input.

In practice, PopupLocation is used in UI toolkits and frameworks to decouple the positioning logic from content. It is commonly applied to tooltips, contextual menus, dropdowns, and modal panels, and is related to concepts such as anchoring, positioning, and popovers.