Sets whether the edit field of the XbpCombobox object is READONLY.
:setEditable( [<lEditable>] ) --> lOldSettingThis method returns whether the edit field of the XbpCombobox object was editable before the :setEditable() method was called.
The :setEditable() method determines whether the value in the edit field of an XbpCombobox object can be changed without having to call the :configure() method. Normally, the value in the instance variable :editable defines whether the value in the edit field can be changed. This instance variable must be set before the method :create() is called. To change the editable state after the call to :create(), the :setEditable() method is used. This method should not be confused with the method :disable(), which makes the XbpCombobox object inaccessible. Whenever the edit field is set to 'not editable' using :setEditable(.F.), the value of the combo box, however, can still be changed by selecting an item from the item list. For XbpCombobox objects of type XBPCOMBO_DROPDOWN or XBPCOMBO_DROPDOWNLIST, the element which opens the drop-down list is operational regardless of the editable state. In addition, the value in the edit field can still be selected and copied to the clipboard.
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