Method onAction

src/AsyncDialog.cpp:253–256

			TextField* textField;
			std::function<void(char*)> action;
			void onAction(const ActionEvent& e) override {
				action(strdup(textField->text.c_str()));
				dialog->getParent()->requestDelete();
			}
		};
		AsyncOkButton* const okButton = new AsyncOkButton;
		okButton->box.size.x = buttonWidth;