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TGraphScrollBar.md

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TGraphScrollBar = class(TPersistent)

This class manages a horizontal or vertical scroll bar on a TSimpleGraph control.

Properties

In addition to the properties of the TPersistent class, the TGraphScrollBar class provides the following properties:

  • published ButtonSize: Integer default 0
    Specifies the sizes of the buttons in the scroll bar.

    If the scroll bar is horizontal, ButtonSize is the width of the arrow buttons in pixels.

    If the scroll bar is vertical, ButtonSize is the height of the arrow buttons in pixels.

    Set this property to zero to use the system's default button size.

  • published Color: TColor default clBtnHighlight
    Specifies the scroll bar's color.

  • published Increment: TScrollBarInc default 8
    Determines how far the display moves when the user clicks one of the small end arrows on the scroll bar.

  • public Kind: TScrollBarKind (read-only)
    Indicates whether the scroll bar is horizontal or vertical.

  • published Margin: Word default 0
    Determines the minimum number of pixels that must separate a graph object from the edge of the TSimpleGraph control. At runtime, whenever a graph object is less than Margin pixels from the edge and the Visible property is set to true, the scroll bar appears.

  • public Owner: TSimpleGraph (read-only)
    Determines the TSimpleGraph control that owns this scroll bar.

  • published ParentColor: Boolean default true
    Specifies whether the scroll bar should use the color of its parent TSimpleGraph control.

    When the value of the Color property is changed, the ParentColor property is automatically set to false.

  • published Position: Integer default 0
    Specifies the position of the thumb tab on the scroll bar.

    Use Position to programmatically scroll the client area of the TSimpleGraph control.

    The value of Position changes (from 0 to Range) at runtime as the user scrolls the scroll bar.

  • public Range: Integer (read-only)
    Determines how far the scrolling region of the TSimpleGraph control can move.

  • public ScrollPos: Integer (read-only)
    Indicates the position of the thumb tab.

    The read-only ScrollPos property gets the current value of the Position property when the scroll bar is visible. If the scroll bar is not visible, the value of this property is 0.

  • published Size: Integer default 0
    Specifies the scroll bar's size.

    If the scroll bar is horizontal, Size is the width of the scroll bar in pixels.

    If the scroll bar is vertical, ButtonSize is the height of the scroll bar in pixels.

    Set this property to zero to use the system's default size.

  • published Smooth: Boolean default false
    Specifies whether the amount the TSimpleGraph control scrolls is dynamically computed.

  • published Style: TScrollBarStyle default ssRegular
    Determines whether the scroll bar appears three-dimensional, flat, or uses hot tracking.

  • published ThumbSize: Integer default 0
    Specifies the length of the scroll bar's thumb tab.

  • published Tracking: Boolean default false
    Determines whether the graph on the TSimpleGraph control moves before the thumb tab is released.

  • published Visible: Boolean default true
    Determines whether the scroll bar appears.

    If Visible is set to true, the scroll bar appears whenever a graph object is less than Margin pixels from the edge of the TSimpleGraph control.

    If Visible is set to false, the scroll bar is never visible.

Methods

In addition to the methods of the TPersistent class, the TGraphScrollBar class has the following public method:

  • function IsScrollBarVisible: Boolean;
    Determines whether the scroll bar is currently visible on the TSimpleGraph control.

    Returns true if the scroll bar is visible; otherwise, returns false.