/// <returns> True if painting is handled (should skip default). </returns>
protected virtual bool DoPrePaintItem(PaintTreeItemEventArgs args)
{
if (args.Node != null)
{
using (Brush brush = new SolidBrush(SystemColors.Window))
{
args.Graphics.FillRectangle(brush, args.Bounds);
}
if (OnPrePaintItem != null)
{
OnPrePaintItem(this, args);
}
}
return(false);
}
protected virtual void DoPostPaintItem(PaintTreeItemEventArgs args)
{
if (args.Node != null)
{
Rectangle bounds = args.Node.Bounds;
bounds.Height -= 1;
if (args.Focused)
{
using (Brush brush = new SolidBrush(Color.FromArgb(70, SystemColors.Highlight)))
{
args.Graphics.FillRectangle(brush, bounds);
}
}
if (args.Selected)
{
args.Graphics.DrawRectangle(SystemPens.Highlight, bounds);
}
if (OnPostPaintItem != null)
{
OnPostPaintItem(this, args);
}
}
}
private bool NotifyTreeCustomDraw(ref Message message)
{
message.Result = (IntPtr)CustomDrawReturnFlags.CDRF_DODEFAULT;
NMTVCUSTOMDRAW customDrawInfo = (NMTVCUSTOMDRAW)message.GetLParam(typeof(NMTVCUSTOMDRAW));
IntPtr thisHandle = Handle;
if (customDrawInfo.nmcd.hdr.hwndFrom == Handle)
{
switch (customDrawInfo.nmcd.dwDrawStage)
{
case (int)CustomDrawDrawStateFlags.CDDS_PREPAINT:
message.Result = (IntPtr)CustomDrawReturnFlags.CDRF_NOTIFYITEMDRAW;
break;
case (int)CustomDrawDrawStateFlags.CDDS_ITEMPREPAINT:
message.Result = (IntPtr)CustomDrawReturnFlags.CDRF_NOTIFYPOSTPAINT;
PaintTreeItemEventArgs args = GetPaintTreeItemEventArgs(customDrawInfo);
try
{
args.ForeColor = SystemColors.WindowText;
args.BackColor = SystemColors.Window;
if (DoPrePaintItem(args))
{
DoPostPaintItem(args);
message.Result = (IntPtr)CustomDrawReturnFlags.CDRF_SKIPDEFAULT;
}
customDrawInfo.clrTextBk =
RGB
(
args.BackColor.R,
args.BackColor.G,
args.BackColor.B
);
customDrawInfo.clrText =
RGB
(
args.ForeColor.R,
args.ForeColor.G,
args.ForeColor.B
);
Marshal.StructureToPtr(customDrawInfo, message.LParam, true);
}
finally
{
args.Graphics.Dispose();
}
break;
case (int)CustomDrawDrawStateFlags.CDDS_ITEMPOSTPAINT:
args = GetPaintTreeItemEventArgs(customDrawInfo);
try
{
DoPostPaintItem(args);
}
finally
{
args.Graphics.Dispose();
}
break;
}
}
return(false);
}