Block color settings are available via the $block array, but it’s trickier than it seems. First of all, if you’re referencing an array value by key name, the key must be in quotes. E.g.:
$block[textColor]; // <-- THIS *WON'T* WORK.
$block['textColor']; // <-- THIS *WILL* WORK.
The next thing to note is that different $block settings will be returned depending on whether a predefined named color was picked from the palette or a custom color was picked.
If you pick one of the default palette colors (or if you have set your own palette colors with the add_theme_support('editor-color-palette', array( ... ));, it will return the slug of the color (e.g., blue) instead of a hex-value, and in two separate array keys.
If you pick custom colors, they will be accessible via $block['style']['color']['background'] and $block['style']['color']['text'].
If you pick two predefined colors:
$block Array => (
...
[backgroundColor] => bright-purple
[textColor] => white
)
If you pick two custom colors:
$block Array => (
...
[style] => Array (
[color] => Array (
[background] => #cccccc
[text] => #aa0000
)
)
)
And if you pick one palette color and one custom color:
$block Array => (
...
[textColor] => black
[style] => Array
(
[color] => Array
(
[background] => #cccccc
)
)
)
