private IntPtr _HandleNCHitTest(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
IntPtr intPtr = IntPtr.Zero;
handled = false;
if (Utility.IsOSVistaOrNewer && this._chromeInfo.GlassFrameThickness != default(Thickness) && this._isGlassEnabled)
{
handled = NativeMethods.DwmDefWindowProc(this._hwnd, uMsg, wParam, lParam, out intPtr);
}
if (IntPtr.Zero == intPtr)
{
Point point = new Point((double)Utility.GET_X_LPARAM(lParam), (double)Utility.GET_Y_LPARAM(lParam));
Rect deviceRectangle = this._GetWindowRect();
HT ht = this._HitTestNca(DpiHelper.DeviceRectToLogical(deviceRectangle), DpiHelper.DevicePixelsToLogical(point));
if (ht != HT.CLIENT)
{
Point point2 = point;
point2.Offset(-deviceRectangle.X, -deviceRectangle.Y);
point2 = DpiHelper.DevicePixelsToLogical(point2);
IInputElement inputElement = this._window.InputHitTest(point2);
if (inputElement != null && WindowChrome.GetIsHitTestVisibleInChrome(inputElement))
{
ht = HT.CLIENT;
}
}
handled = true;
intPtr = new IntPtr((int)ht);
}
return(intPtr);
}
/// <summary>
/// Sets the IsHitTestVisibleInChromeProperty to a MetroWindow template child
/// </summary>
/// <param name="window">The MetroWindow.</param>
/// <param name="name">The name of the template child.</param>
/// <param name="hitTestVisible"></param>
public static void SetIsHitTestVisibleInChromeProperty <T>(this MetroWindow window, string name, bool hitTestVisible = true) where T : class
{
if (window == null)
{
throw new ArgumentNullException(nameof(window));
}
var inputElement = window.GetPart <T>(name) as IInputElement;
Debug.Assert(inputElement != null, $"{name} is not a IInputElement");
if (WindowChrome.GetIsHitTestVisibleInChrome(inputElement) != hitTestVisible)
{
WindowChrome.SetIsHitTestVisibleInChrome(inputElement, hitTestVisible);
}
}
private IntPtr _HandleNCHITTEST(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled)
{
// We always want to handle hit-testing
handled = true;
var dpi = this.AssociatedObject.GetDpi();
// Let the system know if we consider the mouse to be in our effective non-client area.
var mousePosScreen = Utility.GetPoint(lParam); //new Point(Utility.GET_X_LPARAM(lParam), Utility.GET_Y_LPARAM(lParam));
var windowPosition = this._GetWindowRect();
var mousePosWindow = mousePosScreen;
mousePosWindow.Offset(-windowPosition.X, -windowPosition.Y);
mousePosWindow = DpiHelper.DevicePixelsToLogical(mousePosWindow, dpi.DpiScaleX, dpi.DpiScaleY);
var ht = this._HitTestNca(DpiHelper.DeviceRectToLogical(windowPosition, dpi.DpiScaleX, dpi.DpiScaleY),
DpiHelper.DevicePixelsToLogical(mousePosScreen, dpi.DpiScaleX, dpi.DpiScaleY));
if (ht != HT.CLIENT ||
this.AssociatedObject.ResizeMode == ResizeMode.CanResizeWithGrip)
{
// If the app is asking for content to be treated as client then that takes precedence over _everything_, even DWM caption buttons.
// This allows apps to set the glass frame to be non-empty, still cover it with WPF content to hide all the glass,
// yet still get DWM to draw a drop shadow.
var inputElement = this.AssociatedObject.InputHitTest(mousePosWindow);
if (inputElement is not null)
{
if (WindowChrome.GetIsHitTestVisibleInChrome(inputElement))
{
return(new IntPtr((int)HT.CLIENT));
}
var direction = WindowChrome.GetResizeGripDirection(inputElement);
if (direction != ResizeGripDirection.None)
{
return(new IntPtr((int)this._GetHTFromResizeGripDirection(direction)));
}
}
}
return(new IntPtr((int)ht));
}