Aspose::Words::Fields::FieldStart::Accept method

FieldStart::Accept method

Accepts a visitor.

bool Aspose::Words::Fields::FieldStart::Accept(System::SharedPtr<Aspose::Words::DocumentVisitor> visitor) override
ParameterTypeDescription
visitorSystem::SharedPtr<Aspose::Words::DocumentVisitor>The visitor that will visit the node.

ReturnValue

False if the visitor requested the enumeration to stop.

Remarks

Calls VisitFieldStart().

For more info see the Visitor design pattern.

Examples

Shows how to work with a collection of fields.

void FieldCollection_()
{
    auto doc = MakeObject<Document>();
    auto builder = MakeObject<DocumentBuilder>(doc);

    builder->InsertField(u" DATE \\@ \"dddd, d MMMM yyyy\" ");
    builder->InsertField(u" TIME ");
    builder->InsertField(u" REVNUM ");
    builder->InsertField(u" AUTHOR  \"John Doe\" ");
    builder->InsertField(u" SUBJECT \"My Subject\" ");
    builder->InsertField(u" QUOTE \"Hello world!\" ");
    doc->UpdateFields();

    SharedPtr<FieldCollection> fields = doc->get_Range()->get_Fields();

    ASSERT_EQ(6, fields->get_Count());

    // Iterate over the field collection, and print contents and type
    // of every field using a custom visitor implementation.
    auto fieldVisitor = MakeObject<ExField::FieldVisitor>();

    {
        SharedPtr<System::Collections::Generic::IEnumerator<SharedPtr<Field>>> fieldEnumerator = fields->GetEnumerator();
        while (fieldEnumerator->MoveNext())
        {
            if (fieldEnumerator->get_Current() != nullptr)
            {
                fieldEnumerator->get_Current()->get_Start()->Accept(fieldVisitor);
                if (fieldEnumerator->get_Current()->get_Separator() != nullptr)
                {
                    fieldEnumerator->get_Current()->get_Separator()->Accept(fieldVisitor);
                }
                fieldEnumerator->get_Current()->get_End()->Accept(fieldVisitor);
            }
            else
            {
                std::cout << "There are no fields in the document." << std::endl;
            }
        }
    }

    std::cout << fieldVisitor->GetText() << std::endl;
}

class FieldVisitor : public DocumentVisitor
{
public:
    FieldVisitor()
    {
        mBuilder = MakeObject<System::Text::StringBuilder>();
    }

    String GetText()
    {
        return mBuilder->ToString();
    }

    VisitorAction VisitFieldStart(SharedPtr<FieldStart> fieldStart) override
    {
        mBuilder->AppendLine(String(u"Found field: ") + System::ObjectExt::ToString(fieldStart->get_FieldType()));
        mBuilder->AppendLine(String(u"\tField code: ") + fieldStart->GetField()->GetFieldCode());
        mBuilder->AppendLine(String(u"\tDisplayed as: ") + fieldStart->GetField()->get_Result());

        return VisitorAction::Continue;
    }

    VisitorAction VisitFieldSeparator(SharedPtr<FieldSeparator> fieldSeparator) override
    {
        mBuilder->AppendLine(String(u"\tFound separator: ") + fieldSeparator->GetText());

        return VisitorAction::Continue;
    }

    VisitorAction VisitFieldEnd(SharedPtr<FieldEnd> fieldEnd) override
    {
        mBuilder->AppendLine(String(u"End of field: ") + System::ObjectExt::ToString(fieldEnd->get_FieldType()));

        return VisitorAction::Continue;
    }

private:
    SharedPtr<System::Text::StringBuilder> mBuilder;
};

See Also

Aspose::Words::Fields::FieldStart::Type method Aspose::Words::Fields::FieldStart::get_FieldData method