public static bool debugCheckHasMaterialLocalizations(BuildContext context)
{
D.assert(() => {
if (Localizations.of <MaterialLocalizations>(context, typeof(MaterialLocalizations)) == null)
{
var list = new List <DiagnosticsNode>()
{
new ErrorSummary("No MaterialLocalizations found."),
new ErrorDescription(
"${context.widget.runtimeType} widgets require MaterialLocalizations " +
"to be provided by a Localizations widget ancestor."
),
new ErrorDescription(
"Localizations are used to generate many different messages, labels, " +
"and abbreviations which are used by the material library."
),
new ErrorHint(
"To introduce a MaterialLocalizations, either use a " +
"MaterialApp at the root of your application to include them " +
"automatically, or add a Localization widget with a " +
"MaterialLocalizations delegate."
),
};
list.AddRange(context.describeMissingAncestor(expectedAncestorType: typeof(MaterialLocalizations)));
throw new UIWidgetsError(list);
}
return(true);
});
return(true);
}
public static bool debugCheckHasMaterialLocalizations(BuildContext context)
{
D.assert(() => {
if (Localizations.of <MaterialLocalizations>(context, typeof(MaterialLocalizations)) == null)
{
StringBuilder message = new StringBuilder();
message.AppendLine("No MaterialLocalizations found.");
message.AppendLine(
context.widget.GetType() + " widgets require MaterialLocalizations " +
"to be provided by a Localizations widget ancestor.");
message.AppendLine(
"Localizations are used to generate many different messages, labels," +
"and abbreviations which are used by the material library. ");
message.AppendLine(
"To introduce a MaterialLocalizations, either use a " +
" MaterialApp at the root of your application to include them " +
"automatically, or add a Localization widget with a " +
"MaterialLocalizations delegate.");
message.AppendLine(
"The specific widget that could not find a MaterialLocalizations ancestor was:"
);
message.AppendLine(" " + context.widget);
List <Widget> ancestors = new List <Widget>();
context.visitAncestorElements((Element element) => {
ancestors.Add(element.widget);
return(true);
});
if (ancestors.isNotEmpty())
{
message.Append("The ancestors of this widget were:");
foreach (Widget ancestor in ancestors)
{
message.Append("\n " + ancestor);
}
}
else
{
message.AppendLine(
"This widget is the root of the tree, so it has no " +
"ancestors, let alone a \"Localizations\" ancestor."
);
}
throw new UIWidgetsError(message.ToString());
}
return(true);
});
return(true);
}
public static CupertinoLocalizations of(BuildContext context)
{
return(Localizations.of <CupertinoLocalizations>(context, typeof(CupertinoLocalizations)));
}
public static L of(BuildContext context)
{
return(Localizations.of <L>(context, typeof(MaterialLocalizations)));
}
