json_theme #

Library to encode and decode ThemeData and associated objects to / from JSON. This is currently an early release of the library.

This provides two main classes.

• ThemeDecoder -- Provides functionality to decode theme related objects from JSON maps.
• ThemeEncoder -- Provides functionality to encode theme related objects into JSON maps.

Note: Encoding and decoding is mostly bi-directionally compatible, but it is not fully bi-directionally compatible. That's because there are some properties in theme objects that exist on the constructors, but are not re-exposed as properties and only exposed as dynamic calculated values. Likewise, there are some dynamic classes (specifically custom Shape, Slider, and Decoration classes) that have no meaningful way of being encoded to JSON nor decoded from JSON.

The decoders will throw assert errors when unsupported properties are encountered. The encoders will typically follow a "fail silently" policy and omit unsupported properties that the decoders cannot handle. This means it's safe to pass an encoded JSON map to the decoders, but hand crafted JSON may encounter issues.

Class Selection #

As close as possible, the names used in the Dart APIs are replicated. However, there are instances where the class is different for things like Shape objects, or there's an enum like VerticalDirection. Those are all documented in this section.

BorderRadius

Requires a type value that must be one of:

• all ==> BorderRadius.all
• circular ==> BorderRadius.circular
• horizontal ==> BorderRadius.horizontal
• only ==> BorderRadius.only
• vertical ==> BorderRadius.vertical

BorderStyle

Plain string that must be one of:

• none ==> BorderStyle.none
• solid ==> BorderStyle.solid

BottomNavigationBarType

Plain string that must be one of:

• fixed ==> BottomNavigationBarType.fixed
• shifting ==> BottomNavigationBarType.shifting

**ButtonBarLayoutBehavior

Plain string that must be one of:

• constrained ==> ButtonBarLayoutBehavior.constrained
• padded ==> ButtonBarLayoutBehavior.padded

ButtonTextTheme

Plain string that must be one of:

• accent ==> ButtonTextTheme.accent
• normal ==> ButtonTextTheme.normal
• primary ==> ButtonTextTheme.primary

Clip

Plain string that must be one of:

• antiAlias ==> Clip.antiAlias
• antiAliasWithSaveLayer ==> Clip.antiAliasWithSaveLayer
• hardEdge ==> Clip.hardEdge
• none ==> Clip.none

FloatingLabelBehavior

Plain string that must be one of:

• always ==> FloatingLabelBehavior.always
• auto ==> FloatingLabelBehavior.auto
• never ==> FloatingLabelBehavior.never

FontWeight

Plain string that must be one of:

• bold ==> FontWeight.bold
• normal ==> FontWeight.normal
• w100 ==> FontWeight.w100
• w200 ==> FontWeight.w200
• w300 ==> FontWeight.w300
• w400 ==> FontWeight.w400
• w500 ==> FontWeight.w500
• w600 ==> FontWeight.w600
• w700 ==> FontWeight.w700
• w800 ==> FontWeight.w800
• w900 ==> FontWeight.w900

FontStyle

Plain string that must be one of:

• italic ==> FontStyle.italic
• normal ==> FontStyle.normal

InputBorder

Requires a type value that must be one of:

• outline ==> OutlineInputBorder
• underline ==> UnderlineInputBorder

InteractiveInkFeatureFactory

Plain string that must be one of:

• splash ==> InkSplash.splashFactory
• ripple ==> InkRipple.splashFactory

MainAxisAlignment

Plain string that must be one of:

• center ==> MainAxisAlignment.center
• end ==> MainAxisAlignment.end
• spaceAround ==> MainAxisAlignment.spaceAround
• spaceBetween ==> MainAxisAlignment.spaceBetween
• spaceEvenly ==> MainAxisAlignment.spaceEvenly
• start ==> MainAxisAlignment.start

MainAxisSize

Plain string that must be one of:

• min ==> MainAxisSize.min
• max ==> MainAxisSize.max

MaterialTapTargetSize

Plain string that must be one of:

• padded ==> MaterialTapTargetSize.padded
• shrinkWrap ==> MaterialTapTargetSize.shrinkWrap

NavigationRailLabelType

Plain string that must be one of:

• all ==> NavigationRailLabelType.all
• none ==> NavigationRailLabelType.none
• selected ==> NavigationRailLabelType.selected

NotchedShape

Plain string that must be one of:

• circular ==> CircularNotchedRectangle

Radius

Requires a type value that must be one of:

• circular ==> Radius.circular
• elliptical ==> Radius.elliptical
• zero ==> Radius.zero

RangeSliderThumbShape

Requires a type value that must be one of:

• round ==> RoundRangeSliderThumbShape

RangeSliderTickMarkShape

Plain string that must be one of: Requires a type value that must be one of:

• round ==> RoundRangeSliderTickMarkShape

RangeSliderTrackShape

Plain string that must be one of:

• rectangular ==> RectangularRangeSliderTrackShape
• rounded ==> RoundedRectRangeSliderTrackShape

RangeSliderValueIndicatorShape

Requires a type value that must be one of:

• paddle ==> PaddleRangeSliderValueIndicatorShape

ShapeBorder

Requires a type value that must be one of:

• circle ==> CircleBorder
• rectangle ==> ContinuousRectangleBorder
• rounded ==> RoundedRectangleBorder

ShowValueIndicator

Plain string that must be one of:

• always ==> ShowValueIndicator.always
• never ==> ShowValueIndicator.never
• onlyForContinuous ==> ShowValueIndicator.onlyForContinuous
• onlyForDiscrete ==> ShowValueIndicator.onlyForDiscrete

SliderComponentShape

Plain string that must be one of:

• noOverlay ==> SliderComponentShape.noOverlay
• noOverlay ==> SliderComponentShape.noOverlay

SliderTrackShape

Plain string that must be one of:

• rectangular ==> RectangularSliderTrackShape
• rounded ==> RoundedRectSliderTrackShape

SnackBarBehavior

Plain string that must be one of:

• fixed ==> SnackBarBehavior.fixed
• floating ==> SnackBarBehavior.floating

TabBarIndicatorSize

Plain string that must be one of:

• label ==> ButtonTextTheme.label
• tab ==> ButtonTextTheme.tab

TargetPlatform

Plain string that must be one of:

• android ==> TargetPlatform.android
• fuchsia ==> TargetPlatform.fuchsia
• iOS ==> TargetPlatform.iOS
• linux ==> TargetPlatform.linux
• macOS ==> TargetPlatform.macOS
• windows ==> TargetPlatform.windows

TextBaseline

Plain string that must be one of:

• alphabetic ==> TextBaseline.alphabetic
• ideographic ==> TextBaseline.ideographic

TextDecoration

Plain string that must be one of:

• lineThrough ==> TextDecoration.lineThrough
• none ==> TextDecoration.none
• overline ==> TextDecoration.overline
• underline ==> TextDecoration.underline

TextDecorationStyle

Plain string that must be one of:

• dashed ==> TextDecorationStyle.dashed
• dotted ==> TextDecorationStyle.dotted
• double ==> TextDecorationStyle.double
• solid ==> TextDecorationStyle.solid
• wavy ==> TextDecorationStyle.wavy

VerticalDirection

Plain string that must be one of:

• down ==> VerticalDirection.down
• up ==> VerticalDirection.up

VisualDensity

Plain string that must be one of:

• adaptivePlatformDensity ==> VisualDensity.adaptivePlatformDensity
• comfortable ==> VisualDensity.comfortable
• compact ==> VisualDensity.compact
• standard ==> VisualDensity.standard