public static Bitmap ScrollableControlToBitmap(ScrollableControl canvas, bool fullSize, bool includeHidden)
{
canvas.AutoScrollPosition = new Point(0, 0);
if (includeHidden)
{
canvas.SuspendLayout();
foreach (Control child in canvas.Controls)
{
child.Visible = true;
}
canvas.ResumeLayout(true);
}
canvas.PerformLayout();
Size containerSize = canvas.DisplayRectangle.Size;
if (fullSize)
{
containerSize.Width = Math.Max(containerSize.Width, canvas.ClientSize.Width);
containerSize.Height = Math.Max(containerSize.Height, canvas.ClientSize.Height);
}
else
{
containerSize = (canvas is Form) ? canvas.PreferredSize : canvas.ClientSize;
}
var bitmap = new Bitmap(containerSize.Width, containerSize.Height, PixelFormat.Format32bppArgb);
bitmap.SetResolution(canvas.DeviceDpi, canvas.DeviceDpi);
var graphics = Graphics.FromImage(bitmap);
graphics.Clear(canvas.BackColor);
var rtfPrinter = new RichEditPrinter(graphics);
try
{
DrawNestedControls(canvas, canvas, new Rectangle(Point.Empty, containerSize), bitmap, rtfPrinter);
return(bitmap);
}
finally
{
rtfPrinter.Dispose();
graphics.Dispose();
}
}
private static void DrawNestedControls(Control outerContainer, Control parent, Rectangle parentBounds, Bitmap bitmap, RichEditPrinter rtfPrinter)
{
for (int i = parent.Controls.Count - 1; i >= 0; i--)
{
var ctl = parent.Controls[i];
if (!ctl.Visible || (ctl.Width < 1 || ctl.Height < 1))
{
continue;
}
var clipBounds = Rectangle.Empty;
if (parent == outerContainer)
{
clipBounds = ctl.Bounds;
}
else
{
if ((parent != ctl) && parent is ScrollableControl scrctl)
{
Size scrContainerSize = parentBounds.Size;
if (parent is ScrollableControl scrcl2)
{
if (scrcl2.VerticalScroll.Visible)
{
scrContainerSize.Width -= (SystemInformation.VerticalScrollBarWidth + 1);
}
if (scrcl2.HorizontalScroll.Visible)
{
scrContainerSize.Height -= (SystemInformation.HorizontalScrollBarHeight + 1);
}
}
clipBounds = Rectangle.Intersect(new Rectangle(Point.Empty, scrContainerSize), ctl.Bounds);
}
if (clipBounds.Width < 1 || clipBounds.Height < 1)
{
continue;
}
var bounds = outerContainer.RectangleToClient(parent.RectangleToScreen(clipBounds));
if (ctl is RichTextBox rtb)
{
rtfPrinter.DrawRtf(rtb.Rtf, outerContainer.Bounds, bounds, ctl.BackColor);
}
else
{
ctl.DrawToBitmap(bitmap, bounds);
}
if (ctl.HasChildren)
{
DrawNestedControls(outerContainer, ctl, clipBounds, bitmap, rtfPrinter);
}
}
}
}
