CompositeFocusHelper.java 文件源码

public static CompositeFocusHelper createFocusHelper(IsWidget containerWidget, HasFocusHandlers... focusContents) {
    assert containerWidget != null : "containerWidget cannot be null";
    assert containerWidget.asWidget() != null : "containerWidget.asWidget() cannot be null";
    return new CompositeFocusHelper(containerWidget.asWidget(), focusContents);
}