g1455 0.1.0

Liquid Glass for Flutter: refraction, blur and rim over the live backdrop, with the capture priced, held and shared rather than taken per surface.

Unreleased

What a screen reader is told and can do:

• GlassSwitch and GlassSlider take a semanticLabel. A screen reader steps GlassSlider with increase and decrease, by semanticStep (a tenth by default), through onChangeStart, onChanged and onChangeEnd, and never past either end.
• GlassButton takes a semanticLabel that is read in place of its child, for a button that is only an icon.
• showGlassSheet takes a barrierLabel, as showGlassDialog already did. GlassMenuAnchor and GlassPopoverAnchor take one too. Their barrier used to be a tap target with no label, so a screen reader had no way to close a popover.

On a page:

• showGlassSheet takes constraints, as showModalBottomSheet does. A maxWidth keeps the sheet at its content's width, centred, on a window wider than that. Null, it spans the window as before.
• The labels of GlassButton, GlassSegmentedControl and GlassTabBar are not text to select. Under a SelectionArea, a drag across the page used to take them along with the prose around them.

Fixed:

• Glass standing on glass no longer moves what is under the glass it stands on. When a level was captured, the walk painted the levels below it, and a CompositedTransformTarget among them wrote the walk's offset into its own live LeaderLayer. A SelectionArea creates one. So with a popover open over a bar, the bar's text jumped right and down, and it stayed there until the bar repainted. The walk now puts back every live offset it touches.
• A GlassGroup drawn in tiles no longer loses members on the web. Skwasm's fragment shader keeps its uniforms by reference rather than copying them on each draw, so every tile drew the last tile's members, and blobs flickered in and out. On the web each tile now gets its own shader.
• A platform view or a Texture is a hole in the capture of an upper level, as it already was in the base level. It used to be a grey stub. On the web every SelectionArea lays a transparent platform view under what it holds, so a bar over a selectable page showed grey.

0.1.0

First release on pub.dev, as g1455. The package was glass while it lived beside the research application that measures it: the library is now package:g1455/g1455.dart, the shader asset keys are packages/g1455/shaders/..., and glass_diagnostics.dart keeps its name. Everything since the first cut:

Breaking: GlassFinish.regular is now GlassFinish.regularDark, and its damage-table key is 'regularDark' (D230). It was always the dark branch of Apple's .regular, because S4's iPad was in dark mode. The light branch is the new GlassFinish.regularLight: transmission 0.282, tint 252 at 0.718, and its own rows in the resolution and staleness tables. GlassFinish.regular(appearance:, backdrop:) picks the branch Apple's material would. It switches at a backdrop level of 54 in light mode and 222 in dark mode. GlassHost.finish is now optional. Null means that choice, following the declared backdrop and the platform's appearance. GlassTheme.of with no host above does the same. At the default budget the light branch may hold its capture one frame (0.284 ΔE against 0.348).

Drops and lone panels no longer appear through presence, which eroded a capsule to a bright line about 2 pt tall for ~50 ms on the way out. The tab bar's, switch's, slider's and segmented control's drops, and the alert and the menu, now come and go through materialize, as Apple's do (D216, D230).

showGlassDialog and showGlassSheet carry the caller's InheritedThemes to the navigator's overlay, as showDialog does. Their content used to inherit what stands above the navigator, which in a MaterialApp is its error style: red, monospace, underlined in yellow.

GlassMenuAnchor's menu grows out of its anchor — from the anchor's size and capsule to its own, about the corner the two share — while it materializes, and shrinks back into it on the way out. New GlassPopoverAnchor: the same panel around any content, open until a tap outside it. Opening a menu over an anchor with a semantics node of its own no longer trips the framework's !semantics.parentDataDirty on close.

New components, read off Apple's own on iOS 26.5 simulators (D222–D226):

• GlassScrollEdge: the scroll edge effect under a bar, soft or hard, top or bottom. It carries the bar and lifts it. The soft top is a blur of σ 1.6 through the new GlassFade plus an erf tint. The soft bottom is a tint and nothing else, so it captures nothing.

• GlassAbove: raises glass over the glass beside it. A bar over glass cards now shows the cards. It costs one snapshot per recorded frame, and only when there is glass under it.

• GlassSegmentedControl: the selection lifts into a clear drop over a track that is not glass. One level; a slide records nothing.

• GlassButtonGroup: adjacent toolbar actions in one capsule, so one surface rather than one per button.

• GlassTextField and GlassTextField.search: a glass capsule holding an EditableText. The caret and typing take no capture.

• showGlassDialog with GlassAlert, showGlassSheet and GlassMenuAnchor. The menu is placed as Apple places a button's menu (D228): over the anchor, corner on corner, with the anchor hidden. It is 250 wide with rows of 42 and a 31.5 corner. When it opens upward, its items are reversed. These need the GlassHost above the navigator (MaterialApp.builder), and they say so in debug when it is not.

• GlassSurface.fade (GlassFade): the glass fades across itself. It is a smoothstep, and an exact 1.0 when unused.

• GlassRipple (D229), optional and not Apple's: a viscous wave from where the glass was touched. A dimple sinks under the finger, a front travels out, and the dimple springs back on release. viscosity goes from water to honey. Set it on GlassHost.ripple, GlassThemeData.ripple or GlassSurface.ripple. It is drawn by a second program, so a surface with no wave runs the same bytes as before, and a wave takes no capture. Off under reduced motion. Not drawn by fused group members.

Fixed:

• The slider's fill ended in a square cut that the clear drop magnified. It is now a capsule, as Apple's is (D222).
• A screen whose only glass was a resting drop (switches, segments) never stopped drawing. publishUpper notified listeners on every frame even when nothing had changed (D224).
• Under glass on glass, a still screen recorded on every frame when the lower glass held content that was not behind a RepaintBoundary, such as a plain Text. The publish repainted the content, and the new pictures read as a change. A surface now re-adds its content layer when only the proxy changed (D224).
• With two finishes on one screen, each blur class blurred the whole atlas. It now blurs only the box around its own slots. On the iPad this was 0.8 ms of a scrolling frame with a scroll edge over cards (D227).

0.1.0-dev.1

Not published.

First cut of the package, moved out of the research application that measured it. Behaviour is unchanged from that application's lib/, with one exception: a debug assertion. The changes:

• Shaders moved under lib/shaders/ and are declared through packages/glass/. The asset key is now packages/glass/shaders/... whether the package is the root or a dependency.
• glass_diagnostics.dart is a new library for benchmark switches and the host's proxy handle: debugGlassFusedSplit, debugGlassFoldCull, debugGlassShaderAntiAlias, fusedDrawTiles, GlassFusedTile, kMaxFusedTiles, the two shader asset keys, GlassProxyHandle and GlassProxyScope. These are no longer exported from glass.dart.
• GlassPlatformSignals and GlassSignals were removed from the package. It ships no platform code, and the native side never belonged to it. The application reads these settings and passes them in. GlassThermalState stays, because GlassHost.thermal takes it.
• The host's debug check that the layer watch saw a repaint no longer fires when everything that repainted is glass content. Example: a label inside a GlassBar changing, when the bar's height follows the label. That case is not a hole, because glass content is not part of the proxy. The check now reads a second walk that excludes only the glass draws (D219).
• The same check no longer fires when the host's boundary was repainted but drew nothing of its own. RenderObject.layout marks paint unconditionally, so an application's setState that re-runs a Scaffold's layout at the same geometry repaints the host's boundary. When every pixel under it belongs to a nested boundary, that repaint mints no picture and the screen is still. The example's slider tripped it on its first press. The check now fires only when a picture outside every nested boundary is present.
• GlassSurface.labelled, GlassGroup.labelled and GlassUnion.labelled: glass that carries no label is exempt from the theme's minLabelContrast dim and keeps the finish it names. The switch's, slider's and tab bar's drops are unlabelled. Dimmed for a label they do not have, they turned grey over a rich backdrop.
• GlassButton no longer fills the width it is offered. In a Wrap or a Column it was a bar, because its label sat in a bare Center.
• Disabled controls now look disabled. Before, onPressed: null and onChanged: null removed the gestures and nothing else. As on iOS 26, a disabled GlassSwitch or GlassSlider is drawn as one group at kGlassDisabledOpacity (0.5), with a plain knob in place of the drop. A disabled GlassButton keeps its glass, and its label becomes kGlassDisabledDarkLabel or kGlassDisabledLightLabel (iOS's tertiaryLabel), chosen by the polarity of the label it would have drawn enabled (D221). A control disabled mid-press or mid-drag lets go.