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package org.scijava.widget;

/**
 * Flexible panel-building interface, for use with UIs that prompt for input
 * values of various types.
 * 
 * @author Curtis Rueden
 * @param <P> The type of UI component housing the input panel itself.
 * @param <W> The type of UI component housing each input widget.
 */
public interface InputPanel<P, W> extends UIComponent<P> {

	// TODO - groups of fields

	/** Gets whether the given widget would be appropriate for the given panel. */
	default boolean supports(final InputWidget<?, ?> widget) {
		// verify this panel's widget type matches that of the given widget
		final Class<?> thisType = getWidgetComponentType();
		final Class<?> thatType = widget.getComponentType();
		return thisType.isAssignableFrom(thatType);
	}

	/** Adds a widget to the panel. */
	void addWidget(InputWidget<?, W> widget);

	/**
	 * Returns the value of the given widget's input.
	 * 
	 * @param name unique name identifying this field
	 */
	Object getValue(String name);

	/** Gets the number of active widgets in the input panel. */
	int getWidgetCount();

	/** Gets whether the input panel has any active widgets. */
	boolean hasWidgets();

	/** Returns true if the input panel consists of only messages. */
	boolean isMessageOnly();

	/** Updates the widgets to reflect the most recent parameter value(s). */
	void refresh();

	/** Gets the type of the UI component housing the panel's widgets. */
	Class<W> getWidgetComponentType();
	
	/** Gets the widget with the provided name. */
	InputWidget<?, W> getWidget(String name);

}
