Diagnosticable properties

[jpnurmi]

Implement Diagnosticable.debugFillProperties for all widgets to allow inspecting property values in dev tools.

[Jupi007]

I am wrong, or it is like this that we could merge the tree of a YaruCheckbox, with its RepaintBoundary, CustomPainter, etc. into just a YaruCheckbox?

[jpnurmi]

For example, the Material Switch:

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(FlagProperty('value', value: value, ifTrue: 'on', ifFalse: 'off', showName: true));
    properties.add(ObjectFlagProperty<ValueChanged<bool>>('onChanged', onChanged, ifNull: 'disabled'));
  }

This makes it possible to see the value at runtime in dev tools:

Material	Yaru

[jpnurmi]

There's probably some special handling for Material widgets in dev tools so I'm not sure if we can make it appear as nice, but we can certainly make the value appear under the state if we use the diagnosticable mixin and implement the properties.

[Jupi007]

Okay great 👍

[jpnurmi]