/// <summary>Get the standard resize cursor for this box zone value</summary>
public static Cursor ToCursor(this EBoxZone bz)
{
if (bz == EBoxZone.Left || bz == EBoxZone.Right || bz == EBoxZone.LR)
{
return(Cursors.SizeWE);
}
if (bz == EBoxZone.Top || bz == EBoxZone.Bottom || bz == EBoxZone.TB)
{
return(Cursors.SizeNS);
}
if (bz == EBoxZone.TL || bz == EBoxZone.BR)
{
return(Cursors.SizeNWSE);
}
if (bz == EBoxZone.BL || bz == EBoxZone.TR)
{
return(Cursors.SizeNESW);
}
if (bz == EBoxZone.Centre)
{
return(Cursors.SizeAll);
}
return(Cursors.Default);
}
/// <summary>Handle mouse messages over 'Target' and perform resizing</summary>
public bool PreFilterMessage(ref Message m)
{
if (m.HWnd == Target.Handle || Win32.IsChild(Target.Handle, m.HWnd))
{
switch (m.Msg)
{
case Win32.WM_LBUTTONDOWN:
#region
{
var pt = Control.MousePosition;
m_mask = Mask(pt);
if (m_mask != EBoxZone.None)
{
Target.Cursor = m_mask.ToCursor();
m_grab = pt;
m_size = Target.Size;
m_loc = Target.Location;
Target.Capture = true;
return(true);
}
break;
}
#endregion
case Win32.WM_MOUSEMOVE:
#region
{
var pt = Control.MousePosition;
if (m_grab != null)
{
var mn = Target.MinimumSize;
var mx = Target.MaximumSize != Size.Empty ? Target.MaximumSize : new Size(int.MaxValue, int.MaxValue);
var delta = Point_.Subtract(pt, m_grab.Value);
if ((m_mask & EBoxZone.Right) != 0)
{
Target.Width = Math_.Clamp(m_size.Width + delta.Width, mn.Width, mx.Width);
}
if ((m_mask & EBoxZone.Bottom) != 0)
{
Target.Height = Math_.Clamp(m_size.Height + delta.Height, mn.Height, mx.Height);
}
if ((m_mask & EBoxZone.Left) != 0)
{
Target.Width = Math_.Clamp(m_size.Width - delta.Width, mn.Width, mx.Width); Target.Left = m_loc.X + m_size.Width - Target.Width;
}
if ((m_mask & EBoxZone.Top) != 0)
{
Target.Height = Math_.Clamp(m_size.Height - delta.Height, mn.Height, mx.Height); Target.Top = m_loc.Y + m_size.Height - Target.Height;
}
return(true);
}
else if (!Win32.IsChild(Target.Handle, m.HWnd))
{
var mask = Mask(pt);
if (mask != m_mask)
{
Target.Cursor = mask.ToCursor();
m_mask = mask;
}
}
else
{
Target.Cursor = Cursors.Default;
}
break;
}
#endregion
case Win32.WM_LBUTTONUP:
#region
{
if (m_grab != null)
{
m_grab = null;
Target.Capture = false;
return(true);
}
break;
}
#endregion
case Win32.WM_MOUSELEAVE:
#region
{
m_mask = EBoxZone.None;
break;
}
#endregion
}
}
return(false);
}