51ed348f3b
## Description Adds defaults that use tokens to define default `iconSize` and `iconColor` values. Previously, the Material 3 token values for button icon sizes and colors were not being used as defaults when the `ButtonStyleButton.defaultStyleOf` function returned the default values. Adds tests to make sure appropriate `ButtonStyle` fields are populated when defaultStyle is called on buttons. Updated documentation for `defaultStyleOf` to indicated that not _all_ fields need to be non-null, since some fields make sense to be null (e.g. `fixedSize`) because they would otherwise override the behavior of other fields in the same `ButtonStyle`. ## Tests - Added tests to make sure that the appropriate fields are non-null in the default button styles for each type of button.
Token Defaults Generator
Script that generates component theme data defaults based on token data.
Usage
Run this program from the root of the git repository:
dart dev/tools/gen_defaults/bin/gen_defaults.dart [-v]
This updates generated/used_tokens.csv and the various component theme files.
Templates
There is a template file for every component that needs defaults from
the token database. These templates are implemented as subclasses of
TokenTemplate. This base class provides some utilities and a structure
for adding a new block of generated code to the bottom of a given file.
Templates need to override the generate method to provide the generated
code block as a string.
See lib/fab_template.dart for an example that generates defaults for the
Floating Action Button.
Tokens
Tokens are stored in JSON files in data/, and are sourced from
an internal Google database.
template.dart should provide nearly all useful token resolvers
(e.g. color, shape, etc.). For special cases in which one shouldn't
be defined, use getToken to get the raw token value. The script, through
the various revolvers and getToken, validates tokens, keeps track of
which tokens are used, and generates generated/used_tokens.csv.