TScrollBar class

In unit StdCtrls

A control that allows the user to scroll the content in an associated control by moving a slider.

Declaration

pascal

TScrollBar = class(TCustomScrollBar)

Inheritance

Description

A control that allows the user to scroll the content in a windowed control, by moving a slider.

TScrollBar appears as a long rectangular track bar, within which a smaller contrasting block or slider can move up and down (or from side to side in a horizontal ScrollBar). It has small triangular indicators or pointers on one or both ends of the bar, depending on the widgetset.

Clicking with the mouse on one of the pointers moves the slider a small distance (SmallChange) in the specified direction. Clicking with the mouse in the blank area of the scrollbar above or below the slider makes the slider move by a larger increment (LargeChange).

The slider can also be moved by clicking on it with the mouse, and holding down the button while moving the mouse. The slider then follows the mouse until the button is released.

If the mouse has a scrollwheel, the slider also can be moved by rotating the wheel.

The arrow keys or the Page Up/Page Down keys on the keyboard can be used to move the slider, too.

The location of the slider along the track is held in the Position property. It's the programmer's responsibility to ensure that the content of the window is scrolled to the new Position of the scrollbar.

Properties

`Align`	published	Specifies the placement of the control on its Parent control.
`Anchors`	published	The set of anchor definitions for this control.
`BidiMode`	published	Indicates whether text controls use in bi-directional reading.
`BorderSpacing`	published	Determines the inner and outer border spacing for this control.
`Constraints`	published	Contains the minimum and maximum Width and Height for the control.
`DoubleBuffered`	published	When enabled, it reduces flicker when the control is painted.
`DragCursor`	published	The cursor shape shown during a drag operation.
`DragKind`	published	Indicates the action performed for a drag operation: drag-and-drop or drag-and-dock.
`DragMode`	published	Determines how a drag operation is started for the control.
`Enabled`	published	Determines whether the control responds to mouse or keyboard input.
`Kind`	published	Contains the scrollbar orientation, horizontal or vertical.
`LargeChange`	published	The distance to scroll on an click beneath the slider.
`Max`	published	The maximum value for the bottom or right position depending on orientation.
`Min`	published	The minimum value for the top or left position depending on orientation.
`PageSize`	published	The size of the slider relative to the total scroll range.
`ParentBidiMode`	published	Indicates whether the BiDiMode settings in the Parent control are used.
`ParentDoubleBuffered`	published	Value for the DoubleBuffered property in a Parent control.
`ParentShowHint`	published	If True, the value of ShowHint for the control will be the same as the one from the Parent. Default is True.
`PopupMenu`	published	A context-sensitive menu that pops up when the right mouse button is clicked over this control.
`Position`	published	The position of the slider in the scrollbar.
`ShowHint`	published	Enables Hint display for the control.
`SmallChange`	published	The distance to scroll when the up or down button is clicked.
`TabOrder`	published	Indicates the navigation order for the control when the user presses the Tab or Shift+Tab key.
`TabStop`	published	Enables keyboard navigation using the Tab or Shift+Tab keys.
`Visible`	published	Allows the control, and all of its children, to be displayed or hidden.

Events

`OnChange`	published	Event handler signalled when the value in Position, Min, Max, or PageSize is changed.
`OnContextPopup`	published	Invoked when a context-sensitive pop-up menu is requested.
`OnDragDrop`	published	Event handler signalled when an object is dropped onto the control.
`OnDragOver`	published	Event handler signalled when a control is dragged over the control instance.
`OnEndDrag`	published	Event handler signalled for the end of a drag-drop operation.
`OnEnter`	published	Event handler signalled when the control receives focus.
`OnExit`	published	Event handler signalled when the control loses focus.
`OnKeyDown`	published	Event handler signalled for key down keyboard events.
`OnKeyPress`	published	Event handler signalled for character data entered by the user.
`OnKeyUp`	published	Event handler signalled when a key up event has occurred for the control.
`OnScroll`	published	Event handler signalled when scrollbar messages are applied.
`OnStartDrag`	published	Event handler signalled for the start of a dragging operation.
`OnUTF8KeyPress`	published	Handler for a character entered by the user.