Checkboxes are widgets which allow a user to visually see the state of an entity, whether it is checked or not, and tie this state to the truth value of a Boolean cell, "TRUE" if the checkbox is checked and "FALSE" the checkbox is not. The check box can be used to alter the value of a cell, which will alter any other cells whose values are computed based on the dependent cell. This provides a simple way to alter a whole series of computations.
The properties of the checkbox can be altered with the Properties menu item in the context menu which appears when the mouse cursor is placed over the checkbox and one of the secondary mouse buttons is pressed.
Checkboxes have two properties which can be configured: the worksheet cell whose value will be altered by clicking in the checkbox and the text displayed on the checkbox.
The "Link to:" field allows the user to select a cell that will be changed in response to changes in the state of the widget. A user can type the name of a cell in the text box or may click in the text box to activate it and then click on the worksheet to select the desired cell and Gnumeric will automatically add a reference to the cell.
The "Label" field accepts a text value which will appear next to the checkbox. This text can indicate what the checkbox field alters, for instance in Figure 9-10 the checkbox could be used to alter a series of calculations, between including interest or excluding it, from the computation.