Scrollbars.
Scrollbars are widgets that allow the changing of a numeric value by click-dragging with the mouse.
The scrollbar widget can be used in three ways: by dragging the 'thumb', by clicking on the arrows, or by clicking in the 'channel'. The 'thumb' is the small rectangular element between the two arrow buttons. The 'thumb' can be dragged by placing the mouse pointer over the thumb, clicking and holding with the primary mouse button and then dragging the mouse pointer up or down. Clicking on the arrow buttons will scroll the thumb in the direction of the arrow. The 'channel' is the area between the arrows that is not the 'thumb'. A mouse click with the primary mouse button when the mouse pointer is over the 'channel' will cause the scrollbar to move a 'page'. The motion of the 'thumb' will cause a numeric value to change based on the configuration of the widget, as is explained below.
9.3.4.1. Configuring the properties of the scrollbar
The properties of the scrollbar can be altered with the menu item in the context menu which appears when the mouse cursor is placed over the scrollbar and one of the secondary mouse buttons is pressed.
Scrollbars have five properties which can be configured: the worksheet cell whose value will be altered by movement of the scrollbar 'thumb', the minimum value when the thumb is at the top of its channel, the maximum value reached when the thumb is at the bottom of its channel, the smallest increment of change which is the change caused by clicking on the arrows, and the page increment which is the change which occurs when the channel is clicked.
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 other properties can be changed either by typing a new number into the text box or by using the up and down arrows to increment or decrement the width number.