6.4.5 adjustment

Superclass: gtk-object

The adjustment object represents a value which has an associated lower and upper bound, together with step and page increments, and a page size. It is used within several GTK+ widgets, including spin-button, viewport, and range (which is a base class for h-scrollbar, v-scrollbar, h-scale, v-scale).

The adjustment object does not update the value itself. Instead it is left up to the owner of the GtkAdjustment to control the value.

Slots:

• lower. Type: double-float. Accessor: adjustment-lower.

  The minimum value of the adjustment.

  Default value: 0

• page-increment. Type: double-float. Accessor: adjustment-page-increment.

  The page increment of the adjustment.

  Default value: 0

• page-size. Type: double-float. Accessor: adjustment-page-size.

  The page size of the adjustment. Note that the page-size is irrelevant and should be set to zero if the adjustment is used for a simple scalar value, e.g. in a spin-button.

  Default value: 0

• step-increment. Type: double-float. Accessor: adjustment-step-increment.

  The step increment of the adjustment.

  Default value: 0

• upper. Type: double-float. Accessor: adjustment-upper.

  The maximum value of the adjustment. Note that values will be restricted by (- upper page-size) if the page-size property is nonzero.

  Default value: 0

• value. Type: double-float. Accessor: adjustment-value.

  The value of the adjustment.

  Default value: 0

Signals:

• "changed". Signature: (instance adjustment) => void. Options: run-first, no-recurse.

  Emitted when one or more of the adjustment fields have been changed, other than the adjustment-value field.

• "value-changed". Signature: (instance adjustment) => void. Options: run-first, no-recurse.

  Emitted when the adjustment-value field has been changed.