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GtkCombo::set_value_in_list

void set_value_in_list(bool val, bool ok_if_empty);

警告！这个方法在 PHP-GTK 2 中被废弃， 并且不应当在新的代码中使用。

Specifies whether the value entered in the text entry field must match one of the values in the list. If this is set then the user will not be able to perform any other action until a valid value has been entered.

If an empty field is acceptable, the ok_if_empty parameter should be true.

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