void _WmLbuttondown(POINT p0)
{
bool isColor = false;
//bool isAnyShape = false; //rejected. Not useful.
var ic = _flags & (ICFlags.Image | ICFlags.Color | ICFlags.Rectangle);
if (ic == ICFlags.Color)
{
isColor = true;
}
else
{
var mod = keys.gui.getMod();
if (mod != 0 && ic == ICFlags.Rectangle)
{
return;
}
switch (mod)
{
case 0: break;
//case KMod.Shift: isAnyShape = true; break;
case KMod.Ctrl when ic == 0: isColor = true; break;
default: return;
}
}
Result = new ICResult();
var r = new RECT(p0.x, p0.y, 0, 0);
if (isColor)
{
Result.color = (uint)_img.GetPixel(p0.x, p0.y).ToArgb();
r.right++; r.bottom++;
}
else
{
//var a = isAnyShape ? new List<POINT>() { p0 } : null;
var pen = Pens.Red;
bool notFirstMove = false;
_capturing = true;
try {
if (!WndUtil.DragLoop(_w, MButtons.Left, m => {
if (m.msg.message != Api.WM_MOUSEMOVE)
{
return;
}
POINT p = m.msg.pt; _w.MapScreenToClient(ref p);
using var g = Graphics.FromHwnd(_w.Handle);
//if (isAnyShape) {
// a.Add(p);
// g.DrawLine(pen, p0, p);
// p0 = p;
//} else {
if (notFirstMove) //erase prev rect
{
r.right++; r.bottom++;
g.DrawImage(_img, r, r, GraphicsUnit.Pixel);
//FUTURE: prevent flickering. Also don't draw under magnifier.
}
else
{
notFirstMove = true;
}
r = RECT.FromLTRB(p0.x, p0.y, p.x, p.y);
r.Normalize(true);
g.DrawRectangle(pen, r);
//}
})) //Esc key etc
{
Api.InvalidateRect(_w);
return;
}
}
finally { _capturing = false; }
//GraphicsPath path = null;
//if (isAnyShape && a.Count > 1) {
// path = _CreatePath(a);
// r = RECT.From(path.GetBounds(), false);
//} else {
r.right++; r.bottom++;
//}
if (r.NoArea)
{
Api.DestroyWindow(_w);
return;
}
if (ic != ICFlags.Rectangle)
{
var b = _img.Clone(r, PixelFormat.Format32bppArgb);
var d = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, b.PixelFormat);
try { unsafe { _SetAlpha((uint *)d.Scan0, r /*, path*/); } }
finally { b.UnlockBits(d); /*path?.Dispose();*/ }
Result.image = b;
}
}
_w.MapClientToScreen(ref r);
Result.rect = r;
_res = 1;
Api.DestroyWindow(_w);
}