#4068: Provide number widget

[stefan-korn]

fixes #4068

• Test coverage exists
• Documentation exists

QA Steps

• Add manual QA steps in checklist format for a reviewer to perform to confirm that the feature or fix is working. Include as much details as possible so that the reviewer doesn't lose time figuring out how to perform steps.

[janette]

@stefan-korn this would need test coverage before it can be merged.

[dafeder]

@stefan-korn are you able to add some coverage? The easiest thing would probably be to add a number field to Drupal\Tests\json_form_widget\Unit\JsonFormBuilderTest

[dafeder]

I think this will satisfy codeclimate about code/doc standards

[dafeder]

Suggested change

	* @param mixed $spec
	* Object with spec for UI options.
	* optional specs
	* - step
	* - min
	* - max
	* @param object $spec
	* Specification for UI options. Optional properties:
	* - step: Ensures that the number is an even multiple of step.
	* - min: Minimum value.
	* - max: Maximum value.

[dafeder]

Suggested change

	* @return array
	* The element configured as number.
	*/
	* @return array
	* The element configured as number.
	*
	* @see \Drupal\Core\Render\Element\Number
	*/

[dafeder]

@stefan-korn have given this another review. See my one comment here, I was able to cause an error by giving the ui schema a step but not a max.

I'd like to get this in, but I think it needs a little more work. Beyond the comments in this and previous reviews, I think it should also work to define a field as "number" directly in the schema, with no additional definition in the UI schema. This may mean adding a new "helper" class, or else consolidating "number" and "integer" since they ultimately use the same field type.

[dafeder]

@stefan-korn shouldn't this be $spec->max?

[stefan-korn]

@dafeder : I addressed your comments.

Regarding "number" in the schema. I wasn't aware that there is the integer field. It is only used once in the data-dictionary.json I suppose and we do not need data dictionary right now, so I missed that.

Should the schema be configurable about step, min and max? That way no widget "number" would be needed at all?