public bool invokeAction(UiWidgetAction action, Intent intent, FocusNode focusNode = null)
{
D.assert(action != null);
D.assert(intent != null);
focusNode = focusNode ?? FocusManagerUtils.primaryFocus;
if (action != null && intent.isEnabled(focusNode.context))
{
action.invoke(focusNode, intent);
return(true);
}
return(false);
}
public static bool invoke(
BuildContext context,
Intent intent,
FocusNode focusNode = null,
bool nullOk = false
)
{
D.assert(context != null);
D.assert(intent != null);
Element actionsElement = null;
UiWidgetAction action = null;
bool visitAncestorElement(Element element)
{
if (!(element.widget is Actions))
{
return(true);
}
actionsElement = element;
Actions actions = element.widget as Actions;
action = actions.actions.getOrDefault(intent.key)?.Invoke();
return(action == null);
}
context.visitAncestorElements(visitAncestorElement);
D.assert(() => {
if (nullOk)
{
return(true);
}
if (actionsElement == null)
{
throw new UIWidgetsError($"Unable to find a {typeof(Actions)} widget in the context.\n" +
"Actions.invoke() was called with a context that does not contain an " +
$"{typeof(Actions)} widget.\n" +
$"No {typeof(Actions)} ancestor could be found starting from the context that " +
"was passed to Actions.invoke(). This can happen if the context comes " +
"from a widget above those widgets.\n" +
"The context used was:\n" +
$" {context}");
}
if (action == null)
{
throw new UIWidgetsError(
$"Unable to find an action for an intent in the {typeof(Actions)} widget in the context.\n" +
"Actions.invoke() was called on an {typeof(Actions)} widget that doesn't " +
"contain a mapping for the given intent.\n" +
"The context used was:\n" +
$" {context}\n" +
"The intent requested was:\n" +
$" {intent}");
}
return(true);
});
if (action == null)
{
return(false);
}
return(_findDispatcher(actionsElement).invokeAction(action, intent, focusNode: focusNode));
}