Abstract base class for sliders. Abstract base class for sliders, used to adjust a value by moving a grabber along a horizontal or vertical axis. Sliders are [Range]-based controls. If [code]true[/code], the slider can be interacted with. If [code]false[/code], the value can be changed only by code. If [code]true[/code], the value can be changed using the mouse wheel. Number of ticks displayed on the slider, including border ticks. Ticks are uniformly-distributed value markers. If [code]true[/code], the slider will display ticks for minimum and maximum values. Emitted when dragging stops. If [param value_changed] is true, [member Range.value] is different from the value when you started the dragging. Emitted when dragging is started.