/// <summary>
/// Sets opacity and/or transparent color.
/// </summary>
/// <param name="allowTransparency">Set or remove WS_EX_LAYERED style that is required for transparency. If false, other parameters are not used.</param>
/// <param name="opacity">Opacity from 0 (completely transparent) to 255 (opaque). Does not change if null. If less than 0 or greater than 255, makes 0 or 255.</param>
/// <param name="colorKey">Make pixels of this color completely transparent. Does not change if null. The alpha byte is not used.</param>
/// <exception cref="AuWndException"/>
/// <remarks>
/// Uses API <msdn>SetLayeredWindowAttributes</msdn>.
/// On Windows 7 works only with top-level windows, on newer OS also with controls.
/// </remarks>
public void SetTransparency(bool allowTransparency, int?opacity = null, ColorInt?colorKey = null)
{
var est = ExStyle;
bool layered = (est & WS2.LAYERED) != 0;
if (allowTransparency)
{
uint col = 0, f = 0; byte op = 0;
if (colorKey != null)
{
f |= 1; col = (uint)colorKey.GetValueOrDefault().ToBGR();
}
if (opacity != null)
{
f |= 2; op = (byte)AMath.MinMax(opacity.GetValueOrDefault(), 0, 255);
}
if (!layered)
{
SetExStyle(est | WS2.LAYERED);
}
if (!Api.SetLayeredWindowAttributes(this, col, op, f))
{
ThrowUseNative();
}
}
else if (layered)
{
SetExStyle(est & ~WS2.LAYERED); //tested: resets attributes, ie after adding WS2.LAYERED the window will be normal
}
}
static AVersion()
{
Api.RTL_OSVERSIONINFOW x = default; x.dwOSVersionInfoSize = Api.SizeOf(x);
if (0 == Api.RtlGetVersion(ref x))
{
_winver = AMath.MakeUshort(x.dwMinorVersion, x.dwMajorVersion);
//use this because Environment.OSVersion.Version (GetVersionEx) lies, even if we have correct manifest when is debugger present
}
else
{
Debug.Fail("RtlGetVersion");
var v = Environment.OSVersion.Version;
_winver = AMath.MakeUshort(v.Minor, v.Major);
}
_minWin8 = _winver >= Win8;
_minWin8_1 = _winver >= Win8_1;
_minWin10 = _winver >= Win10;
_is32BitOS = sizeof(IntPtr) == 4 && !(Api.IsWow64Process(Api.GetCurrentProcess(), out _isWow64) && _isWow64);
}
//Alternative to returning HTCAPTION on WM_NCITTEST.
//void _DragMoveWindow()
//{
// _tb._InMoveSize(true);
// try {
// var w = (AWnd)this;
// var pp = AMouse.XY;
// Util.ADragDrop.SimpleDragDrop(w, MButtons.Left, o => {
// if(o.Msg.message != Api.WM_MOUSEMOVE) return;
// var p = AMouse.XY; if(p == pp) return;
// var r = w.Rect;
// w.MoveLL(r.left + (p.x - pp.x), r.top + (p.y - pp.y));
// pp = p;
// });
// }
// finally { _tb._InMoveSize(false); }
//}
bool _WmNchittest(ref Message m)
{
int h;
if (ModifierKeys == Keys.Shift) //move
{
h = Api.HTCAPTION;
}
else //resize?
{
if (_tb._border == TBBorder.None || (!_tb.Sizable && _tb._border < TBBorder.Thick))
{
return(false);
}
var w = this.Hwnd();
LPARAM xy = m.LParam;
int x = AMath.LoShort(xy), y = AMath.HiShort(xy);
if (_tb.Sizable)
{
RECT r; int b;
if (_tb._border < TBBorder.ThreeD)
{
b = (int)_tb._border;
r = w.Rect;
}
else
{
w.GetWindowInfo_(out var k);
r = k.rcWindow;
b = k.cxWindowBorders;
}
int bx = Math.Min(b, r.Width / 2), by = Math.Min(b, r.Height / 2);
int x1 = r.left + bx, x2 = r.right - bx - 1, y1 = r.top + by, y2 = r.bottom - by - 1;
if (x < x1)
{
h = y < y1 ? Api.HTTOPLEFT : (y > y2 ? Api.HTBOTTOMLEFT : Api.HTLEFT);
}
else if (x > x2)
{
h = y < y1 ? Api.HTTOPRIGHT : (y > y2 ? Api.HTBOTTOMRIGHT : Api.HTRIGHT);
}
else if (y < y1)
{
h = Api.HTTOP;
}
else if (y > y2)
{
h = Api.HTBOTTOM;
}
else
{
return(false);
}
}
else //disable resizing if border is natively sizable
{
if (_tb._border < TBBorder.Thick)
{
return(false);
}
w.GetWindowInfo_(out var k);
k.rcWindow.Inflate(-k.cxWindowBorders, -k.cyWindowBorders);
if (k.rcWindow.Contains(x, y))
{
return(false);
}
h = Api.HTBORDER;
}
}
m.Result = (IntPtr)h;
return(true);
}
public void SetLevel(int level)
{
this.level = (ushort)AMath.MinMax(level, 0, 0xffff);
}
