/// <summary>
/// Ensure that the window doesn't overlap docked toolbars on desktop (like taskbar)
/// </summary>
/// <param name="m">The message.</param>
/// <returns></returns>
private bool CalculateMaxSize(ref Message m)
{
if (_owner.SkiningForm.Parent == null)
{
// create minMax info for maximize data
MINMAXINFO info = (MINMAXINFO)m.GetLParam(typeof(MINMAXINFO));
Rectangle rect = SystemInformation.WorkingArea;
Size fullBorderSize = new Size(SystemInformation.Border3DSize.Width + SystemInformation.BorderSize.Width,
SystemInformation.Border3DSize.Height + SystemInformation.BorderSize.Height);
info.ptMaxPosition.x = rect.Left - fullBorderSize.Width;
info.ptMaxPosition.y = rect.Top - fullBorderSize.Height;
info.ptMaxSize.x = rect.Width + fullBorderSize.Width * 2;
info.ptMaxSize.y = rect.Height + fullBorderSize.Height * 2;
info.ptMinTrackSize.y += FormExtenders.GetCaptionHeight(_owner.SkiningForm);
if (!_owner.SkiningForm.MaximumSize.IsEmpty)
{
info.ptMaxSize.x = Math.Min(info.ptMaxSize.x, _owner.SkiningForm.MaximumSize.Width);
info.ptMaxSize.y = Math.Min(info.ptMaxSize.y, _owner.SkiningForm.MaximumSize.Height);
info.ptMaxTrackSize.x = Math.Min(info.ptMaxTrackSize.x, _owner.SkiningForm.MaximumSize.Width);
info.ptMaxTrackSize.y = Math.Min(info.ptMaxTrackSize.y, _owner.SkiningForm.MaximumSize.Height);
}
if (!_owner.SkiningForm.MinimumSize.IsEmpty)
{
info.ptMinTrackSize.x = Math.Max(info.ptMinTrackSize.x, _owner.SkiningForm.MinimumSize.Width);
info.ptMinTrackSize.y = Math.Max(info.ptMinTrackSize.y, _owner.SkiningForm.MinimumSize.Height);
}
// set wished maximize size
Marshal.StructureToPtr(info, m.LParam, true);
m.Result = (IntPtr)0;
return(true);
}
return(false);
}
protected override void WndProc(ref Message m)
{
bool supressOriginalMessage = false;
if (IsProcessNcArea)
{
switch ((Win32Messages)m.Msg)
{
// update form data on style change
case Win32Messages.STYLECHANGED:
_owner.Skin.UpdateStyle();
if (_owner.Skin != null)
{
_owner.Skin.OnSetRegion(_owner.SkiningForm.Size);
}
break;
#region Handle Form Activation
case Win32Messages.ACTIVATEAPP:
// redraw
if (_owner.Skin != null)
{
_owner.Skin.FormIsActive = (int)m.WParam != 0;
}
_owner.Skin.OnNcPaint(true);
break;
case Win32Messages.ACTIVATE:
// Set active state and redraw
_owner.Skin.FormIsActive = ((int)WAFlags.WA_ACTIVE == (int)m.WParam || (int)WAFlags.WA_CLICKACTIVE == (int)m.WParam);
_owner.Skin.OnNcPaint(true);
break;
case Win32Messages.MDIACTIVATE:
// set active and redraw on activation
if (m.WParam == _owner.SkiningForm.Handle)
{
_owner.Skin.FormIsActive = false;
}
else if (m.LParam == _owner.SkiningForm.Handle)
{
_owner.Skin.FormIsActive = true;
}
_owner.Skin.OnNcPaint(true);
break;
#endregion
#region Handle Mouse Processing
// Set Pressed button on mousedown
case Win32Messages.NCLBUTTONDOWN:
supressOriginalMessage = _owner.Skin.OnMouseDown(ref m);
break;
// Set hovered button on mousemove
case Win32Messages.NCMOUSEMOVE:
_owner.Skin.OnMouseMove(ref m);
break;
// perform button actions if a button was clicked
case Win32Messages.NCLBUTTONUP:
// Handle button up
supressOriginalMessage = _owner.Skin.OnMouseUp(m);
break;
// restore button states on mouseleave
case Win32Messages.NCMOUSELEAVE:
case Win32Messages.MOUSELEAVE:
case Win32Messages.MOUSEHOVER:
_owner.Skin.OnMouseLeave();
break;
#endregion
#region Size Processing
// Set region as window is shown
case Win32Messages.SHOWWINDOW:
if (_owner.Skin != null)
{
_owner.Skin.OnSetRegion(_owner.SkiningForm.Size);
}
break;
// adjust region on resize
case Win32Messages.SIZE:
_owner.Skin.OnSize(m);
break;
// ensure that the window doesn't overlap docked toolbars on desktop (like taskbar)
case Win32Messages.GETMINMAXINFO:
supressOriginalMessage = CalculateMaxSize(ref m);
break;
// update region on resize
case Win32Messages.WINDOWPOSCHANGING:
WINDOWPOS wndPos = (WINDOWPOS)m.GetLParam(typeof(WINDOWPOS));
if ((wndPos.flags & (int)SWPFlags.SWP_NOSIZE) == 0)
{
if (_owner.Skin != null)
{
_owner.Skin.OnSetRegion(new Size(wndPos.cx, wndPos.cy));
}
}
break;
// remove region on maximize or repaint on resize
case Win32Messages.WINDOWPOSCHANGED:
if (_owner.SkiningForm.WindowState == FormWindowState.Maximized)
{
_owner.SkiningForm.Region = null;
}
WINDOWPOS wndPos2 = (WINDOWPOS)m.GetLParam(typeof(WINDOWPOS));
if ((wndPos2.flags & (int)SWPFlags.SWP_NOSIZE) == 0)
{
_owner.Skin.UpdateCaption();
_owner.Skin.OnNcPaint(true);
}
break;
#endregion
#region Non Client Area Handling
// paint the non client area
case Win32Messages.NCPAINT:
if (_owner.Skin.OnNcPaint(true))
{
m.Result = (IntPtr)1;
supressOriginalMessage = true;
}
break;
// calculate the non client area size
case Win32Messages.NCCALCSIZE:
if (m.WParam == (IntPtr)1)
{
if (_owner.SkiningForm.MdiParent != null)
{
break;
}
// add caption height to non client area
NCCALCSIZE_PARAMS p = (NCCALCSIZE_PARAMS)m.GetLParam(typeof(NCCALCSIZE_PARAMS));
p.rect0.Top += FormExtenders.GetCaptionHeight(_owner.SkiningForm);
Marshal.StructureToPtr(p, m.LParam, true);
}
break;
// non client hit test
case Win32Messages.NCHITTEST:
if (_owner.Skin.OnNcHitTest(ref m))
{
supressOriginalMessage = true;
}
break;
#endregion
}
}
if (!supressOriginalMessage)
{
base.WndProc(ref m);
}
}
