private void ChangeCursor(ChromeHitTest test)
{
var cs = this.Cursor;
switch (test)
{
case ChromeHitTest.Left:
case ChromeHitTest.Right:
cs = Cursors.SizeWE;
break;
case ChromeHitTest.Top:
case ChromeHitTest.Bottom:
cs = Cursors.SizeNS;
break;
case ChromeHitTest.TopLeft:
case ChromeHitTest.BottomRight:
cs = Cursors.SizeNWSE;
break;
case ChromeHitTest.TopRight:
case ChromeHitTest.BottomLeft:
cs = Cursors.SizeNESW;
break;
}
if (cs != Cursor)
{
Cursor = cs;
}
}
/// <summary>
/// Sets the HitTestType property for an UI element.
/// </summary>
/// <param name="element">The UI element.</param>
/// <param name="type">The hit-test type.</param>
/// <exception cref="System.ArgumentNullException">element</exception>
public static void SetHitTestType(DependencyObject element, ChromeHitTest type)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
element.SetValue(HitTestTypeProperty, type);
}
private ChromeHitTest HandleNcHitTest(IntPtr lParam)
{
Point screenPoint = lParam.ToPoint();
Point windowPoint = ContentWindow.PointFromScreen(screenPoint);
ChromeHitTest location = ChromeHitTest.Client;
var element = ContentWindow.InputHitTest(windowPoint);
if (element != null)
{
location = Chrome.GetHitTestType((DependencyObject)element);
}
if (_resizeGrip != null && _resizeGrip.Visibility == System.Windows.Visibility.Visible &&
VisualTreeHelper.HitTest(_resizeGrip, _resizeGrip.PointFromScreen(screenPoint)) != null)
{
location = _resizeGrip.FlowDirection == System.Windows.FlowDirection.LeftToRight ?
ChromeHitTest.BottomRight : ChromeHitTest.BottomLeft;
}
//Debug.WriteLine(location);
return(location);
}
private ChromeHitTest HandleHcHitTest(IntPtr lParam)
{
ChromeHitTest res = ChromeHitTest.Border;
if (_manager.ContentWindow.ResizeMode == ResizeMode.CanResizeWithGrip ||
_manager.ContentWindow.ResizeMode == ResizeMode.CanResize)
{
var pt = (Point)lParam.ToPoint();
pt = PointFromScreen(pt);
//Debug.WriteLine("NC pt = " + pt);
int diagSize = (int)(2 * PadSize * UIHooks.GetWindowDpiScale(_manager.ContentWindow));
switch (Side)
{
case BorderSide.Left:
if (pt.Y <= diagSize)
{
res = ChromeHitTest.TopLeft;
}
else if (pt.Y >= Height - diagSize)
{
res = ChromeHitTest.BottomLeft;
}
else
{
res = ChromeHitTest.Left;
}
break;
case BorderSide.Top:
if (pt.X <= diagSize)
{
res = ChromeHitTest.TopLeft;
}
else if (pt.X >= Width - diagSize)
{
res = ChromeHitTest.TopRight;
}
else
{
res = ChromeHitTest.Top;
}
break;
case BorderSide.Right:
if (pt.Y <= diagSize)
{
res = ChromeHitTest.TopRight;
}
else if (pt.Y >= Height - diagSize)
{
res = ChromeHitTest.BottomRight;
}
else
{
res = ChromeHitTest.Right;
}
break;
case BorderSide.Bottom:
if (pt.X <= diagSize)
{
res = ChromeHitTest.BottomLeft;
}
else if (pt.X >= Width - diagSize)
{
res = ChromeHitTest.BottomRight;
}
else
{
res = ChromeHitTest.Bottom;
}
break;
}
//Debug.WriteLine("Side {0}({1},{2}) at {3}, res = {4}", Side, Width, Height, pt, res);
}
return(_lastHitTest = res);
}
IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
IntPtr retVal = IntPtr.Zero;
if (!handled)
{
try
{
var wmsg = (WindowMessage)msg;
//Debug.WriteLine(wmsg);
switch (wmsg)
{
//case WindowMessage.WM_NCCALCSIZE:
// handled = true;
// break;
//case WindowMessage.WM_MOUSEMOVE:
// var pt = (Point)lParam.ToPoint();
// Debug.WriteLine("WM point = " + pt);
// break;
case WindowMessage.WM_NCHITTEST:
//pt = (Point)lParam.ToPoint();
//Debug.WriteLine("NC point = " + PointFromScreen(pt));
ChromeHitTest test = HandleHcHitTest(lParam);
// Don't actual report this window as NC anymore and just change cursor instead.
// This allows content window to properly get IsMouseOver=false at edges
if (Mouse.LeftButton != MouseButtonState.Pressed)
{
ChangeCursor(test);
}
//retVal = new IntPtr((int)test);
//handled = true;
break;
//case WindowMessage.WM_NCRBUTTONDOWN:
//case WindowMessage.WM_NCMBUTTONDOWN:
//case WindowMessage.WM_NCRBUTTONDBLCLK:
//case WindowMessage.WM_NCMBUTTONDBLCLK:
//case WindowMessage.WM_RBUTTONDBLCLK:
//case WindowMessage.WM_MBUTTONDBLCLK:
//case WindowMessage.WM_LBUTTONDBLCLK:
// handled = true;
// User32.SetForegroundWindow(_manager.hWndContent);
// break;
//case WindowMessage.WM_NCLBUTTONDOWN:
//case WindowMessage.WM_NCLBUTTONDBLCLK:
// handled = true;
// // pass resizer msg to the content window instead
// User32.SetForegroundWindow(_manager.hWndContent);
// User32.SendMessage(_manager.hWndContent, (uint)msg, wParam, lParam);
// break;
case WindowMessage.WM_RBUTTONDOWN:
case WindowMessage.WM_MBUTTONDOWN:
case WindowMessage.WM_RBUTTONDBLCLK:
case WindowMessage.WM_MBUTTONDBLCLK:
handled = true;
User32.SetForegroundWindow(_manager.hWndContent);
break;
case WindowMessage.WM_LBUTTONDOWN:
case WindowMessage.WM_LBUTTONDBLCLK:
var hitTest = _lastHitTest;
//Debug.WriteLine("Should send {0} to content window.", hitTest);
if (hitTest != ChromeHitTest.Client)
{
User32.SetForegroundWindow(_manager.hWndContent);
User32.PostMessage(_manager.hWndContent, (uint)(msg - NC_TO_WM_DIFF), new IntPtr((int)hitTest), IntPtr.Zero);
//User32.SendMessage(_manager.hWndContent, (uint)(msg - NC_TO_WM_DIFF), new IntPtr((int)hitTest), IntPtr.Zero);
handled = true;
}
break;
case WindowMessage.WM_MOUSEACTIVATE:
//var lowword = 0xffff & lParam.ToInt32();
//var hchit = (ChromeHitTest)lowword;
// in case of non-resizable window eat this msg
//if (hchit == ChromeHitTest.Client)
//{
// retVal = new IntPtr((int)MouseActivate.MA_NOACTIVATEANDEAT);
//}
//else
//{
retVal = new IntPtr((int)MouseActivate.MA_NOACTIVATE);
//}
handled = true;
break;
case WindowMessage.WM_GETMINMAXINFO:
// overridden so max size = normal max + resize border (for when content window is max size without maximizing)
//var thick = 2 * (int)PadSize;
//MINMAXINFO para = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
//var orig = para.ptMaxTrackSize;
//orig.x += thick;
//orig.y += thick;
//para.ptMaxTrackSize = orig;
//Marshal.StructureToPtr(para, lParam, true);
break;
}
}
catch { }
}
return(retVal);
}
