Hello Rainer,
I can reproduce this problem. When specify a TransparencyKey for the form,
the form become a layered window, it seems that
ControlPaint.DrawReversibleFrame() method draws figures beneath the layered
window. Anyway, you can call the Rectangle() API to draw the rubber band on
the form, and call ControlPaint.DrawReversibleFrame() method to draw rubber
band outside the form.
For example:
private void MyDrawReversibleRectangle(Point p1, Point p2)
{
Rectangle rc = new Rectangle();
GDI32 gdi = new GDI32();
gdi.DrawRectangle(this.CreateGraphics(), p1, p2);
// Convert the points to screen coordinates.
p1 = PointToScreen(p1);
p2 = PointToScreen(p2);
// Normalize the rectangle.
if (p1.X < p2.X)
{
rc.X = p1.X;
rc.Width = p2.X - p1.X;
}
else
{
rc.X = p2.X;
rc.Width = p1.X - p2.X;
}
if (p1.Y < p2.Y)
{
rc.Y = p1.Y;
rc.Height = p2.Y - p1.Y;
}
else
{
rc.Y = p2.Y;
rc.Height = p1.Y - p2.Y;
}
// Draw the reversible frame.
ControlPaint.DrawReversibleFrame(rc,
Color.Black, FrameStyle.Thick);
}
The GDI32 class:
public enum RasterOps
{
R2_BLACK = 1,
R2_NOTMERGEPEN,
R2_MASKNOTPEN,
R2_NOTCOPYPEN,
R2_MASKPENNOT,
R2_NOT,
R2_XORPEN,
R2_NOTMASKPEN,
R2_MASKPEN,
R2_NOTXORPEN,
R2_NOP,
R2_MERGENOTPEN,
R2_COPYPEN,
R2_MERGEPENNOT,
R2_MERGEPEN,
R2_WHITE,
R2_LAST
}
public enum BrushStyles
{
BS_SOLID = 0,
BS_NULL = 1,
BS_HATCHED = 2,
BS_PATTERN = 3,
BS_INDEXED = 4,
BS_DIBPATTERN = 5,
BS_DIBPATTERNPT = 6,
BS_PATTERN8X8 = 7,
BS_MONOPATTERN = 9
}
public enum PenStyles
{
PS_SOLID = 0,
PS_DASH = 1,
PS_DOT = 2,
PS_DASHDOT = 3,
PS_DASHDOTDOT = 4
}
class GDI32
{
[System.Runtime.InteropServices.DllImportAttribute( "gdi32.dll")]
private static extern bool Rectangle(IntPtr hdc, int X1, int Y1,
int X2, int Y2);
[System.Runtime.InteropServices.DllImportAttribute( "gdi32.dll")]
private static extern IntPtr CreatePen(PenStyles enPenStyle, int
nWidth, int crColor);
[System.Runtime.InteropServices.DllImportAttribute( "gdi32.dll")]
private static extern IntPtr CreateSolidBrush(BrushStyles
enBrushStyle, int crColor);
[System.Runtime.InteropServices.DllImportAttribute( "gdi32.dll")]
private static extern bool DeleteObject(IntPtr hObject);
[System.Runtime.InteropServices.DllImportAttribute( "gdi32.dll")]
private static extern IntPtr SelectObject(IntPtr hdc, IntPtr
hObject);
[System.Runtime.InteropServices.DllImportAttribute( "gdi32.dll")]
private static extern int SetROP2(IntPtr hdc, int enDrawMode);
protected Color borderColor;
protected Color fillColor;
protected int lineWidth;
protected IntPtr hdc, oldBrush, oldPen, gdiPen, gdiBrush;
protected BrushStyles brushStyle;
protected PenStyles penStyle;
public GDI32()
{
borderColor = Color.Transparent;
fillColor = Color.White;
lineWidth = 1;
brushStyle = BrushStyles.BS_NULL;
penStyle = PenStyles.PS_SOLID;
}
public Color BrushColor
{
get { return fillColor; }
set { fillColor = value; }
}
public BrushStyles BrushStyle
{
get { return brushStyle; }
set { brushStyle = value; }
}
public Color PenColor
{
get { return borderColor; }
set { borderColor = value; }
}
public PenStyles PenStyle
{
get { return penStyle; }
set { penStyle = value; }
}
public int PenWidth
{
get { return lineWidth; }
set { lineWidth = value; }
}
protected int GetRGBFromColor(Color fromColor)
{
return fromColor.ToArgb() & 0xFFFFFF;
}
public void DrawRectangle(Graphics g, Point p1, Point p2)
{
InitPenAndBrush(g);
Rectangle(hdc, p1.X, p1.Y, p2.X, p2.Y);
Dispose(g);
}
protected void InitPenAndBrush(Graphics g)
{
hdc = g.GetHdc();
gdiPen = CreatePen(penStyle, lineWidth,
GetRGBFromColor(PenColor));
gdiBrush = CreateSolidBrush(brushStyle,
GetRGBFromColor(fillColor));
if (PenColor == Color.Transparent) SetROP2(hdc,
(int)RasterOps.R2_XORPEN);
oldPen = SelectObject(hdc, gdiPen);
oldBrush = SelectObject(hdc, gdiBrush);
}
protected void Dispose(Graphics g)
{
SelectObject(hdc, oldBrush);
SelectObject(hdc, oldPen);
DeleteObject(gdiPen);
DeleteObject(gdiBrush);
g.ReleaseHdc(hdc);
g.Dispose();
}
}
If you have any questions or concerns, please don't hesitate to let me know.
Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team
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