ResponsiveContext extension

BuildContext extension exposing the responsive API.

Two groups of members with different reactivity models — see the file header's structure-vs-dimensions split:

Class-based reads (deviceSize; the exact-match predicates isMobile, isTablet, isDesktop; the ordered-threshold predicates isTabletOrLarger, isTabletOrSmaller, isAtLeast, isAtMost; and responsive) resolve the ResponsiveScope's whole-window class and rebuild only when the class flips. They require a ResponsiveScope ancestor.
Viewport-width helpers (responsiveByViewportWidth, clampByViewportWidth) read the nearest MediaQuery width at the call site and rebuild per-pixel. They require only a MediaQuery ancestor.

on

Properties

deviceSize → DeviceSize: Available on BuildContext, provided by the ResponsiveContext extension
The current whole-window DeviceSize, from the enclosing ResponsiveScope.
no setter
isDesktop → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is DeviceSize.desktop.
no setter
isMobile → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is DeviceSize.mobile.
no setter
isTablet → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is DeviceSize.tablet.
no setter
isTabletOrLarger → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is DeviceSize.tablet or wider — the ordered "larger than mobile" threshold.
no setter
isTabletOrSmaller → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is DeviceSize.tablet or narrower — the ordered "smaller than desktop" threshold.
no setter

clampByViewportWidth({required double minValue, required double maxValue, double minW = 360, double maxW = 1200}) → double: Available on BuildContext, provided by the ResponsiveContext extension
Linearly interpolates between minValue and maxValue across the width range [minW, maxW], clamped at both ends — the CSS clamp() equivalent.
isAtLeast(DeviceSize min) → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is at least min on the ordered scale mobile < tablet < desktop (inclusive lower bound).
isAtMost(DeviceSize max) → bool: Available on BuildContext, provided by the ResponsiveContext extension
Whether the current layout width class is at most max on the ordered scale mobile < tablet < desktop (inclusive upper bound).
responsive<T>({required T mobile, T? tablet, T? desktop}) → T: Available on BuildContext, provided by the ResponsiveContext extension
Picks a value by device class, with fallback chaining toward the smaller class.
responsiveByViewportWidth<T>({required Map<double, T> breakpoints, required T fallback}) → T: Available on BuildContext, provided by the ResponsiveContext extension
Picks a value by call-site viewport width, choosing the highest threshold that is <= the current width.