WidgetModel: add widget style convenience accessor

This is especially useful if we want to support widgets being associated
with multiple styles at the same time. Then you can use a separator
character like comma to concatenate the styles. But then the accessor
becomes more important to maintain DRYness.

Author: ctrueden

src/main/java/org/scijava/widget/WidgetModel.java

@@ -125,6 +125,18 @@ public String getWidgetLabel() {
 		return name.substring(0, 1).toUpperCase() + name.substring(1);
 	}
 
+	/**
+	 * Gets whether the widget is the given style. A widget may have multiple
+	 * styles separated by commas, so this method is more correct than using
+	 * {@code style.equals(getItem().getWidgetStyle())}.
+	 */
+	public boolean isStyle(final String style) {
+		for (final String s : getItem().getWidgetStyle().split(",")) {
+			if (s.equals(style)) return true;
+		}
+		return false;
+	}
+
 	/**
 	 * Gets the current value of the module input.
 	 * <p>