protected virtual void OnWmNcHitTest(ref Message m, NuGenWndProcDelegate baseWndProc)
{
Debug.Assert(m != null, "m != null");
Debug.Assert(baseWndProc != null, "baseWndProc != null");
Debug.Assert(User32.IsWindow(m.HWnd), "User32.IsWindow(m.HWnd)");
Point testPoint = NuGenControlPaint.BuildMousePos(m.LParam);
User32.ScreenToClient(m.HWnd, ref testPoint);
int largeOffset = 4;
int smallOffset = 1;
Rectangle bounds = Window.GetBounds(m.HWnd);
Rectangle testRect = Rectangle.Empty;
if (this.IsSizable(m.HWnd))
{
testRect = new Rectangle(
0,
0,
bounds.Width,
largeOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTTOP);
return;
}
testRect = new Rectangle(
0,
bounds.Height - largeOffset,
bounds.Width,
largeOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTBOTTOM);
return;
}
if (Window.IsRightToLeft(m.HWnd))
{
testRect = new Rectangle(
bounds.Width - this.FormProperties.TopRightCornerSize,
0,
this.FormProperties.TopRightCornerSize + smallOffset,
this.FormProperties.TopRightCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTTOPLEFT);
return;
}
testRect = new Rectangle(
0,
0,
this.FormProperties.TopLeftCornerSize + smallOffset,
this.FormProperties.TopLeftCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTTOPRIGHT);
return;
}
testRect = new Rectangle(
bounds.Width - this.FormProperties.BottomRightCornerSize,
bounds.Height - this.FormProperties.BottomRightCornerSize,
this.FormProperties.BottomRightCornerSize + smallOffset,
this.FormProperties.BottomRightCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTBOTTOMLEFT);
return;
}
testRect = new Rectangle(
0,
bounds.Height - this.FormProperties.BottomLeftCornerSize,
this.FormProperties.BottomLeftCornerSize + smallOffset,
this.FormProperties.BottomLeftCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTBOTTOMRIGHT);
return;
}
testRect = new Rectangle(
bounds.Width - largeOffset,
0,
largeOffset,
bounds.Height
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTLEFT);
return;
}
testRect = new Rectangle(0, 0, largeOffset, bounds.Height);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTRIGHT);
return;
}
}
else
{
testRect = new Rectangle(
0,
0,
this.FormProperties.TopLeftCornerSize + smallOffset,
this.FormProperties.TopLeftCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTTOPLEFT);
return;
}
testRect = new Rectangle(
bounds.Width - this.FormProperties.TopRightCornerSize,
0,
this.FormProperties.TopRightCornerSize + smallOffset,
this.FormProperties.TopRightCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTTOPRIGHT);
return;
}
testRect = new Rectangle(
0,
bounds.Height - this.FormProperties.BottomLeftCornerSize,
this.FormProperties.BottomLeftCornerSize + smallOffset,
this.FormProperties.BottomLeftCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTBOTTOMLEFT);
return;
}
testRect = new Rectangle(
bounds.Width - this.FormProperties.BottomLeftCornerSize,
bounds.Height - this.FormProperties.BottomRightCornerSize,
this.FormProperties.BottomRightCornerSize + smallOffset,
this.FormProperties.BottomRightCornerSize + smallOffset
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTBOTTOMRIGHT);
return;
}
testRect = new Rectangle(
0,
0,
largeOffset,
bounds.Height
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTLEFT);
return;
}
testRect = new Rectangle(
bounds.Width - largeOffset,
0,
largeOffset,
bounds.Height
);
if (testRect.Contains(testPoint))
{
m.Result = new IntPtr(WinUser.HTRIGHT);
return;
}
}
}
// HACK: For testing purposes only.
m.Result = (IntPtr)WinUser.HTCAPTION;
}
