QGIS User Guide - OSGeo Download Server

5 LAVORARE CON I DATI VETTORIALI
edit widget
Figura 17: Dialog to select an edit widget for an attribute column
Within the Attributes tab you also find an edit widget column. This column can be used to define
values or a range of values that are allowed to be added to the specific attribute table column. If
you click on the edit widget button, a dialog opens, where you can define different widgets. These
widgets are:
• Line edit: an edit field which allows to enter simple text (or restrict to numbers for numeric
attributes).
• Classification: Displays a combo box with the values used for classification, if you have chosen
’unique value’ as legend type in the symbology tab of the properties dialog.
• Range: Allows to set numeric values from a specific range. The edit widget can be either a
slider or a spin box.
• Unique value: The user can select one of the values already used in the attribute table. If
editable is activated, a line edit is shown with autocompletion support, otherwise a combo box
is used.
• File name: Simplifies the selection by adding a file chooser dialog.
QGIS 1.4.0 User Guide 58