add ui docs

plugins/ui/docs/components/checkbox_group.md

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+# Checkbox Group
+
+Checkbox groups areas allow the selection of one or more items from a list of choices, represented by checkboxes.
+
+## Example
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_basic = ui.checkbox_group(
+    "Soccer",
+    "Basketball",
+    "Baseball",
+    label="Favourite Sports",
+)
+```
+
+## UI Recommendations
+
+Recommendations for creating checkbox groups:
+
+1. Every checkbox group should have a [label](#labeling) specified. Without one, the checkbox group is ambiguous. In the rare case that context is sufficient, the label is unnecessary; you must still include an aria-label via the `aria_label` prop.
+2. While labels can be placed either on top or on the side of the checkbox groups, top labels are the default recommendation. Top labels work better with longer copy, localization, and responsive layouts. Side labels are more useful when vertical space is limited.
+3. Checkbox groups can be either horizontal or vertical. Checkbox groups are vertical by default; the orientation should only be horizontal if vertical space is limited.
+4. Checkbox groups can be marked as optional or required, with required groups indicated by either a “(required)” label or an asterisk icon, which should be accompanied by help text.
+5. Checkbox groups should use help text for error messaging and descriptions, providing context for why a selection is required or clarifying the options.
+
+
+Consider using [`checkbox_group`](./checkbox_group.md) to select or mark a single item as selected.
+
+## Content
+
+Checkbox group's accept checkboxes and primitive types as children. Checkbox's accept a child, which is rendered as the label of the checkbox.
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_content_example = ui.checkbox_group(
+    "Soccer",
+    ui.checkbox("Basketball"),
+    label="Favourite Sports",
+)
+```
+
+
+## Value
+
+Checkbox group's allows selecting zero or more items, with initial values set via `default_value` or controlled values via `value`.
+
+```python
+from deephaven import ui
+
+
+@ui.component
+def ui_checkbox_group_value_examples():
+    value, set_value = ui.use_state(["Soccer"])
+    return [
+        ui.checkbox_group(
+            "Soccer",
+            "Basketball",
+            "Baseball",
+            label="Favourite Sports (uncontrolled)",
+            default_value=["Soccer", "Baseball"],
+        ),
+        ui.checkbox_group(
+            "Soccer",
+            "Basketball",
+            "Baseball",
+            label="Favourite Sports (controlled)",
+            value=value,
+            on_change=set_value,
+        ),
+    ]
+
+
+my_checkbox_group_value_examples = ui_checkbox_group_value_examples()
+```
+
+
+## HTML Forms
+
+Checkbox group's can support a `name` prop for integration with HTML forms, allowing for easy identification of a value on form submission.
+
+```python
+from deephaven import ui
+
+
+my_checkbox_name_example = ui.form(
+    ui.checkbox_group(ui.checkbox("Sample Label"), name="Sample Name")
+)
+```
+
+
+## Labeling
+
+The checkbox group can be labeled using the `label` prop, and if no label is provided, an `aria_label` must be provided to identify the control for accessibility purposes.
+
+```python
+from deephaven import ui
+
+
+@ui.component
+def ui_checkbox_group_label_examples():
+    return [
+        ui.checkbox_group(
+            ui.checkbox("Wizard", value="wizard"),
+            ui.checkbox("Dragon", value="dragon"),
+            label="Favorite avatars",
+        ),
+        ui.checkbox_group(
+            ui.checkbox("Wizard", value="wizard"),
+            ui.checkbox("Dragon", value="dragon"),
+            aria_label="Favorite avatars",
+        ),
+    ]
+
+
+my_checkbox_group_label_examples = ui_checkbox_group_label_examples()
+```
+
+
+The `is_required` prop and the `necessity_indicator` props can be used to show whether selecting an option in the checked group group is required or optional.
+
+When the `necessity_indicator` prop is set to "label", a localized string will be generated for "(required)" or "(optional)" automatically.
+
+```python
+from deephaven import ui
+
+
+@ui.component
+def ui_checkbox_group_required_examples():
+    return [
+        ui.checkbox_group(
+            ui.checkbox("Wizard", value="wizard"),
+            ui.checkbox("Dragon", value="dragon"),
+            label="Favorite avatars",
+            is_required=True,
+        ),
+        ui.checkbox_group(
+            ui.checkbox("Wizard", value="wizard"),
+            ui.checkbox("Dragon", value="dragon"),
+            label="Favorite avatars",
+            is_required=True,
+            necessity_indicator="label",
+        ),
+        ui.checkbox_group(
+            ui.checkbox("Wizard", value="wizard"),
+            ui.checkbox("Dragon", value="dragon"),
+            label="Favorite avatars",
+            necessity_indicator="label",
+        ),
+    ]
+
+
+my_checkbox_group_required_examples = ui_checkbox_group_required_examples()
+```
+
+## Events
+
+Checkbox group's accept an `on_change` prop, which is triggered whenever a checkbox within the group is clicked
+
+```python
+from deephaven import ui
+
+
+@ui.component
+def ui_checkbox_group_event_example():
+    selected, set_selected = ui.use_state(["Soccer"])
+    return ui.flex(
+        ui.checkbox_group(
+            "Soccer",
+            "Basketball",
+            "Baseball",
+            label="Favourite Sports (controlled)",
+            value=selected,
+            on_change=set_selected,
+        ),
+        ui.text(value=f"You have selected: {selected}!"),
+        direction="column",
+    )
+
+
+my_checkbox_group_event_example = ui_checkbox_group_event_example()
+```
+
+To require specific checkboxes to be checked, set the `is_required` prop at the Checkbox level, not the CheckboxGroup. 
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_individual_validation_example = ui.form(
+    ui.checkbox_group(
+        ui.checkbox("Terms and conditions", is_required=True),
+        ui.checkbox("Privacy policy", is_required=True),
+    ),
+    validation_behavior="native",
+)
+```
+
+
+## Orientation
+
+While aligned vertically by default, the axis the checkbox's align with can be changed via the `orientation` prop.
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_orientation_example = ui.checkbox_group(
+    ui.checkbox("Wizard", value="wizard"),
+    ui.checkbox("Dragon", value="dragon"),
+    label="Favorite avatars",
+    orientation="horizontal",
+)
+```
+
+## Label position
+
+By default, the position of a checkbox group's label is above the checkbox group, but it can be changed to the side using the `label_position` prop. 
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_label_position_example = ui.checkbox_group(
+    ui.checkbox("Wizard", value="wizard"),
+    ui.checkbox("Dragon", value="dragon"),
+    label="Favorite avatars",
+    label_position="side",
+)
+```
+
+
+## Help text
+
+A checkbox group can have both a `description` and an `error_message`. Use the error message to offer specific guidance on how to correct the input.
+
+The `is_invalid` prop can be used to set whether the current checkbox group state is valid or invalid.
+
+```python
+from deephaven import ui
+
+
+@ui.component
+def ui_checkbox_group_help_text_examples():
+    return [
+        ui.checkbox_group(
+            "Soccer",
+            "Basketball",
+            "Baseball",
+            label="Favourite sports",
+            description="Select an avatar from the two options.",
+            value=selected,
+            on_change=set_selected,
+        ),
+        ui.checkbox_group(
+            "Soccer",
+            "Basketball",
+            "Baseball",
+            label="Favourite sports",
+            description="Select favourite sports from the two options.",
+            error_message="Sample invalid error message.",
+            is_invalid=True,
+        ),
+    ]
+
+
+my_checkbox_group_help_text_examples = ui_checkbox_group_help_text_examples()
+```
+
+
+## Contextual Help
+
+Using the `contextual_help` prop, a `ui.contextual_help` can be placed next to the label to provide additional information about the checkbox group.
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_contextual_help_example = ui.checkbox_group(
+    "Soccer",
+    "Basketball",
+    "Baseball",
+    label="Favorite sports",
+    contextual_help=ui.contextual_help(ui.heading("Content tips")),
+)
+```
+
+
+## Disabled state
+
+The `is_disabled` prop disables a checkbox group to prevent user interaction. This is useful when the checkbox group should be visible but not available for selection.
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_is_disabled_example = ui.checkbox_group(
+    "Soccer",
+    "Basketball",
+    "Baseball",
+    label="Favorite sports",
+    is_disabled=True,
+)
+```
+
+
+## Read only
+
+The `is_read_only` prop makes checkbox groups read-only to prevent user interaction. This is different from setting the `is_disabled` prop since the checkbox group remains focusable and its options remain visible.
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_is_read_only_example = ui.checkbox_group(
+    "Soccer",
+    "Basketball",
+    "Baseball",
+    label="Favorite sports",
+    is_read_only=True,
+)
+```
+
+## Emphasized
+
+The `is_emphasized` prop makes the selected checkbox the user's accent color, adding a visual prominence to the selection.
+
+
+```python
+from deephaven import ui
+
+
+my_checkbox_group_is_emphasized_example = ui.checkbox_group(
+    "Soccer",
+    "Basketball",
+    "Baseball",
+    label="Favorite sports",
+    is_emphasized=True,
+)
+```
+
+
+
+## API Reference
+
+```{eval-rst}
+.. dhautofunction:: deephaven.ui.checkbox_group
+```
+