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 module com {  module sun {  module star {  module form {  module component {


/** This service specifies a data-aware list box control model.

    <p>The base service for list boxes (ListBox) offers only
    one possibility to specify the list entries:
    The display strings in the
    com::sun::star::awt::UnoControlListBoxModel::StringItemList
    property and the corresponding values in the ListBox::ListSource
    property.</p>

    <p>This service here extends this mimic. It allows to fill the list from a data source.
    This means that a second result set is opened, which works on the same connection as the
    form which the list box belongs to, but can be based on an arbitrary table or SQL statement.</p>

    <p>For instance, you may have a form which is bound to a table <em>invoice</em>, and you use it
    to enter invoices for your customers. Probably, you will have a second table (say <em>customer</em>),
    which (among other data) contains a unique key for identifying customers. In your invoice table, you will
    have a foreign key referring to these customers.<br/>
    Now, besides the result set the form is based on (all your invoices), the list box can be instructed
    to open a second result set, this time for the <em>customer</em> table, and fill its list with entries
    from this result set.<br/>
    Additionally, it allows to model the relation between the two tables: When the user selects a customer from
    the list, this customer has the unique id we just talked about (which is not necessarily visible to the
    user in any way). The list box then automatically transfers this id into the foreign key column of
    <em>invoice</em>, thus allowing the user to transparently work with human-readable strings instead of
    pure numbers.<br/>
    Let's call this result set the list is filled from the <em>list result set</em> here ...</p>

    <p>The display strings are always taken from the first column of that result set,
    and the corresponding value as per the BoundColumn property.</p>
 */
published service DatabaseListBox
{
    service com::sun::star::form::component::ListBox;

    service com::sun::star::form::DataAwareControlModel;


    /** specifies which column of the list result set should be used for data exchange.

        <p>When you make a selection from a list box, the "BoundColumn"
        property reflects which column value of a result set should
        be used as the value of the component. If the control is bound
        to a database field, the column value is stored in the
        database field identified by the property
        com::sun::star::form::DataAwareControlModel::DataField.

        <dl>
            <dt>-1</dt>
            <dd>The index (starting at 0) of the selected list box entry
            is stored in the current database field.</dd>

            <dt>0 or greater</dt>
            <dd>The column value of the result set at the position
            (0-indexed) is stored in the current database field.
            In particular, for value 0, the selected (displayed)
            list box string is stored.</dd>
        </dl></p>

        <p>The bound column property is only used if a list source is defined
        and the list source matches with the types
        com::sun::star::form::ListSourceType::TABLE,
        com::sun::star::form::ListSourceType::QUERY,
        com::sun::star::form::ListSourceType::SQL or
        com::sun::star::form::ListSourceType::SQLPASSTHROUGH.
        Otherwise the property is ignored, as there is no result set from which to
        get the column values.</p>
    */
    [property] short BoundColumn;


    /** describes the kind of list source used.

        <p>Depending on the value of this property, the way the value of ListBox::ListSource
        is evaluated varies.
            <dl>
                <dt>com::sun::star::form::ListSourceType::VALUELIST</dt>
                <dd>The elements in the string sequence in ListBox::ListSource
                build up the entry list.</dd>

                <dt>com::sun::star::form::ListSourceType::TABLE</dt>
                <dd>The first element of the string sequence in ListBox::ListSource
                determines the table which the list result set should be based on.</dd>

                <dt>com::sun::star::form::ListSourceType::QUERY</dt>
                <dd>The first element of the string sequence in ListBox::ListSource
                determines the query which the list result set should be based on.<br/>
                For retrieving the query, the connection which the data form is working with
                (com::sun::star::sdb::RowSet::ActiveConnection) is queried for
                the com::sun::star::sdb::XQueriesSupplier interface.</dd>

                <dt>com::sun::star::form::ListSourceType::SQL</dt>
                <dd>The first element of the string sequence in ListBox::ListSource
                contains the SQL statement which the list result set should be based on.</p>

                <dt>com::sun::star::form::ListSourceType::SQLPASSTHROUGH</dt>
                <dd>The first element of the string sequence in ListBox::ListSource
                contains the SQL statement which the list result set should be based on.<br/>
                The statement is not analyzed by the parser. This means that you can use database specific
                SQL features here, but, on the other hand, lose features like parameter value substitution.</dd>

                <dt>com::sun::star::form::ListSourceType::TABLEFIELDS</dt>
                <dd>The first element of the string sequence in ListBox::ListSource
                determines the table whose column names should fill the list.</dd>
            </dl>
        </p>

     */
    [property] com::sun::star::form::ListSourceType ListSourceType;

    /** The selected values.
     */
    [property, transient, optional] sequence< any > SelectedValues;

    /** The selected value, if there is at most one.
     */
    [property, transient, optional] any SelectedValue;

};


}; }; }; }; };

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