public static void InvertScreenRect(IntPtr hwnd, Rectangle rect)
{
Winapi.RECT rect2;
var loc = Winapi.GetWindowRect(hwnd).Location;
rect.Offset(-loc.X, -loc.Y);
var hdc = Winapi.GetWindowDC(hwnd);
//top edge
rect2 = new Winapi.RECT(rect.Left, rect.Top, rect.Right, rect.Top + INVERT_BORDER);
InvertRect(hdc, ref rect2);
//left edge
rect2 = new Winapi.RECT(rect.Left, rect.Top + INVERT_BORDER, rect.Left + INVERT_BORDER, rect.Bottom - INVERT_BORDER);
InvertRect(hdc, ref rect2);
//right edge
rect2 = new Winapi.RECT(rect.Right - INVERT_BORDER, rect.Top + INVERT_BORDER, rect.Right, rect.Bottom - INVERT_BORDER);
InvertRect(hdc, ref rect2);
//bottom edge
rect2 = new Winapi.RECT(rect.Left, rect.Bottom - INVERT_BORDER, rect.Right, rect.Bottom);
InvertRect(hdc, ref rect2);
Winapi.ReleaseDC(hwnd, hdc);
}
public static void InvertWindow(IntPtr hwnd, bool fShowHidden)
{
Winapi.RECT rect2;
var border = INVERT_BORDER;
//window rectangle (screen coords)
var rect = Winapi.GetWindowRect(hwnd);
//client rectangle (screen coords)
var rectc = Winapi.GetClientRect(hwnd);
var tmp = Winapi.ClientToScreen(hwnd, rectc.Location);
rectc.Left = tmp.X;
rectc.Top = tmp.Y;
var x1 = rect.Left;
var y1 = rect.Top;
OffsetRect(ref rect, -x1, -y1);
OffsetRect(ref rectc, -x1, -y1);
if (rect.Bottom - border * 2 < 0)
{
border = 1;
}
if (rect.Right - border * 2 < 0)
{
border = 1;
}
if (fShowHidden)
{
hwnd = IntPtr.Zero;
}
var hdc = Winapi.GetWindowDC(hwnd);
//top edge
SetRect(out rect2, 0, 0, rect.Right, border);
if (fShowHidden)
{
OffsetRect(ref rect2, x1, y1);
}
InvertRect(hdc, ref rect2);
//left edge
SetRect(out rect2, 0, border, border, rect.Bottom);
if (fShowHidden)
{
OffsetRect(ref rect2, x1, y1);
}
InvertRect(hdc, ref rect2);
//right edge
SetRect(out rect2, border, rect.Bottom - border, rect.Right, rect.Bottom);
if (fShowHidden)
{
OffsetRect(ref rect2, x1, y1);
}
InvertRect(hdc, ref rect2);
//bottom edge
SetRect(out rect2, rect.Right - border, border, rect.Right, rect.Bottom - border);
if (fShowHidden)
{
OffsetRect(ref rect2, x1, y1);
}
InvertRect(hdc, ref rect2);
Winapi.ReleaseDC(hwnd, hdc);
}