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Editorial Team
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Asked: 2026-05-28T13:22:12+00:00

I have a control derived from System.Windows.Forms.UserControl which is placed in a customized grid.

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I have a control derived from System.Windows.Forms.UserControl which is placed in a customized grid. When the first column of the grid is frozen and the grid is scrolled by a few pixels, the second column becomes partially visible such that the control in this column also becomes partially visible.

To achieve this I want to be able to display only the part of the control that is visible either by hiding/clipping the left portion of the control.

I don’t want to modify OnPaint of the control as I don’t have access to the control’s code. I can change the code in the grid where the control is displayed.

I tried the following which didn’t work:
1. Invalidating only part of the control that has to be visible.
2. Using GraphicsPath as follows:

System.Drawing.Drawing2D.GraphicsPath controlPath = new System.Drawing.Drawing2D.GraphicsPath();
controlPath.AddRectangle(visibleRect);
editControl.Region = new Region(controlPath);

Any other ideas?

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1 Answer

  1. Editorial Team

    I got this working solution:

    Using GraphicsPath worked. I wasn’t setting the clip rectangle properly due to which I couldn’t see the clipping happen. Instead of setting the xOffset of the clip region wrt to the Grid I had to set the clip region wrt to the control.
    The window region is a collection of pixels within the window where the operating system permits drawing. The operating system does not display any portion of a window that lies outside of the window region. The coordinates of a control’s region are relative to the upper-left corner of the control, not the client area of the control( http://msdn.microsoft.com/en-us/library/ddhy6052(vs.71).aspx)

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