private unsafe void DrawTreeItem(
string itemText,
int imageIndex,
Gdi32.HDC dc,
RECT rcIn,
int state,
int backColor,
int textColor)
{
Size size = new Size();
var rc2 = new RECT();
var rc = new RECT(rcIn.left, rcIn.top, rcIn.right, rcIn.bottom);
ImageList imagelist = ImageList;
IntPtr hfontOld = IntPtr.Zero;
// Select the font of the dialog, so we don't get the underlined font
// when the item is being tracked
using var fontSelection = new Gdi32.SelectObjectScope(
dc,
(state& STATE_HOT) != 0 ? (Gdi32.HGDIOBJ)Parent.FontHandle : default);
GC.KeepAlive(Parent);
// Fill the background
if (((state & STATE_SELECTED) != 0) && !_hbrushDither.IsNull)
{
FillRectDither(dc, rcIn);
Gdi32.SetBkMode(dc, Gdi32.BKMODE.TRANSPARENT);
}
else
{
Gdi32.SetBkColor(dc, backColor);
Gdi32.ExtTextOutW(dc, 0, 0, Gdi32.ETO.CLIPPED | Gdi32.ETO.OPAQUE, ref rc, null, 0, null);
}
// Get the height of the font
Gdi32.GetTextExtentPoint32W(dc, itemText, itemText.Length, ref size);
// Draw the caption
rc2.left = rc.left + SIZE_ICON_X + 2 * PADDING_HORZ;
rc2.top = rc.top + (((rc.bottom - rc.top) - size.Height) >> 1);
rc2.bottom = rc2.top + size.Height;
rc2.right = rc.right;
Gdi32.SetTextColor(dc, textColor);
User32.DrawTextW(
dc,
itemText,
itemText.Length,
ref rc2,
User32.DT.LEFT | User32.DT.VCENTER | User32.DT.END_ELLIPSIS | User32.DT.NOPREFIX);
ComCtl32.ImageList.Draw(
imagelist,
imageIndex,
dc,
PADDING_HORZ,
rc.top + (((rc.bottom - rc.top) - SIZE_ICON_Y) >> 1),
ComCtl32.ILD.TRANSPARENT);
// Draw the hot-tracking border if needed
if ((state & STATE_HOT) != 0)
{
int savedColor;
// top left
savedColor = Gdi32.SetBkColor(dc, ColorTranslator.ToWin32(SystemColors.ControlLightLight));
rc2.left = rc.left;
rc2.top = rc.top;
rc2.bottom = rc.top + 1;
rc2.right = rc.right;
Gdi32.ExtTextOutW(dc, 0, 0, Gdi32.ETO.OPAQUE, ref rc2, null, 0, null);
rc2.bottom = rc.bottom;
rc2.right = rc.left + 1;
Gdi32.ExtTextOutW(dc, 0, 0, Gdi32.ETO.OPAQUE, ref rc2, null, 0, null);
// bottom right
Gdi32.SetBkColor(dc, ColorTranslator.ToWin32(SystemColors.ControlDark));
rc2.left = rc.left;
rc2.right = rc.right;
rc2.top = rc.bottom - 1;
rc2.bottom = rc.bottom;
Gdi32.ExtTextOutW(dc, 0, 0, Gdi32.ETO.OPAQUE, ref rc2, null, 0, null);
rc2.left = rc.right - 1;
rc2.top = rc.top;
Gdi32.ExtTextOutW(dc, 0, 0, Gdi32.ETO.OPAQUE, ref rc2, null, 0, null);
Gdi32.SetBkColor(dc, savedColor);
}
}
