ScrollControl Method (DrawUtility)

Will call ther native windows ScvrollWindowEx api if the caller has securoty permissions to call unmanaged code. If not this method will just invalidate the control.

Syntax

Visual Basic

'Declaration
 
Public Shared Function ScrollControl( _
   ByVal control As Control, _
   ByVal xAmount As Integer, _
   ByVal yAmount As Integer, _
   ByVal scrollRect As Rectangle, _
   ByVal clipRect As Rectangle, _
   ByRef updateRect As Rectangle, _
   ByVal eraseBackground As Boolean, _
   ByVal invalidate As Boolean, _
   ByVal scrollChildren As Boolean, _
   ByVal smoothScrollAmount As Short _
) As Integer

C#

public static int ScrollControl( 
   Control control,
   int xAmount,
   int yAmount,
   Rectangle scrollRect,
   Rectangle clipRect,
   ref Rectangle updateRect,
   bool eraseBackground,
   bool invalidate,
   bool scrollChildren,
   short smoothScrollAmount
)

Parameters

control

The control to scroll.

xAmount

The amount to scroll left to right.

yAmount

The amount to scroll up and down.

scrollRect

The portion of the client area to be scrolled

clipRect

Only device bits within the clipping rectangle are affected. Bits scrolled from the outside of the rectangle to the inside are painted; bits scrolled from the inside of the rectangle to the outside are not painted.

updateRect

Receives the boundaries of the rectangle invalidated by scrolling.

eraseBackground

Erases the newly invalidated region by sending a WM_ERASEBKGND message to the window when specified with the invalidate flag is true.

invalidate

Invalidates the exposed region after scrolling.

scrollChildren

Scrolls all child windows that intersect the scrollRect parameter. The child windows are scrolled by the number of pixels specified by the xAmount and yAmount parameters. The system sends a WM_MOVE message to all child windows that intersect scrollRect, even if they do not move.

smoothScrollAmount

If greatern than 0 scrolls using smooth scrolling. The amount is in milliseconds.

Return Value

If the function succeeds, the return value is 2 for SIMPLEREGION (rectangular invalidated region), 3 for COMPLEXREGION (nonrectangular invalidated region; overlapping rectangles), or 1 for NULLREGION (no invalidated region). If the function fails, the return value is 0.

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2