pyqt_reactive.forms.widget_dispatcher

Widget dispatcher with fail-loud ABC checking.

Replaces duck typing (hasattr checks) with explicit isinstance checks against ABCs. All methods fail loud if widget doesn’t implement required ABC.

Design Philosophy: - Explicit over implicit - Fail-loud over fail-silent - Type-safe over duck-typed

Classes

WidgetDispatcher()

ABC-based widget dispatch - NO DUCK TYPING.

class pyqt_reactive.forms.widget_dispatcher.WidgetDispatcher

ABC-based widget dispatch - NO DUCK TYPING.

Replaces hasattr checks with explicit isinstance checks. Fails loud if widget doesn’t implement required ABC.

Example

# BEFORE (duck typing): if hasattr(widget, ‘get_value’):

value = widget.get_value()

# AFTER (ABC-based): value = WidgetDispatcher.get_value(widget) # Raises TypeError if not ValueGettable

static get_value(widget: Any) → Any

Get value from widget using explicit ABC check.

Parameters:

widget – The widget to get value from

Returns:

The widget’s current value

Raises:

TypeError – If widget doesn’t implement ValueGettable ABC

static set_value(widget: Any, value: Any) → None

Set value on widget using explicit ABC check.

Parameters:

• widget – The widget to set value on

• value – The value to set

Raises:

TypeError – If widget doesn’t implement ValueSettable ABC

static set_placeholder(widget: Any, text: str) → None

Set placeholder using explicit ABC check.

Parameters:

• widget – The widget to set placeholder on

• text – The placeholder text

Raises:

TypeError – If widget doesn’t implement PlaceholderCapable ABC

static configure_range(widget: Any, minimum: float, maximum: float) → None

Configure range using explicit ABC check.

Parameters:

• widget – The widget to configure

• minimum – Minimum value

• maximum – Maximum value

Raises:

TypeError – If widget doesn’t implement RangeConfigurable ABC

static set_enum_options(widget: Any, enum_type: type) → None

Set enum options using explicit ABC check.

Parameters:

• widget – The widget to configure

• enum_type – The Enum class

Raises:

TypeError – If widget doesn’t implement EnumSelectable ABC

static get_selected_enum(widget: Any) → Any

Get selected enum using explicit ABC check.

Parameters:

widget – The widget to get selection from

Returns:

The selected enum value

Raises:

TypeError – If widget doesn’t implement EnumSelectable ABC

static connect_change_signal(widget: Any, callback: Callable[[Any], None]) → None

Connect change signal using explicit ABC check.

Parameters:

• widget – The widget to connect signal on

• callback – Callback function receiving new value

Raises:

TypeError – If widget doesn’t implement ChangeSignalEmitter ABC

static disconnect_change_signal(widget: Any, callback: Callable[[Any], None]) → None

Disconnect change signal using explicit ABC check.

Parameters:

• widget – The widget to disconnect signal from

• callback – Callback function to disconnect

Raises:

TypeError – If widget doesn’t implement ChangeSignalEmitter ABC