/// <summary>
/// Sets the WindowChrome ResizeGripDirection to a CrystalWindow template child.
/// </summary>
/// <param name="window">The CrystalWindow.</param>
/// <param name="name">The name of the template child.</param>
/// <param name="direction">The direction.</param>
public static void SetWindowChromeResizeGripDirection([NotNull] this CrystalWindow window, string name, ResizeGripDirection direction)
{
if (window is null)
{
throw new ArgumentNullException(nameof(window));
}
var inputElement = window.GetPart<IInputElement>(name);
Debug.Assert(inputElement != null, $"{name} is not a IInputElement");
if (inputElement is not null && WindowChrome.GetResizeGripDirection(inputElement) != direction)
{
WindowChrome.SetResizeGripDirection(inputElement, direction);
}
}
/// <summary>
/// Sets the WindowChrome ResizeGripDirection to a MetroWindow template child.
/// </summary>
/// <param name="window">The MetroWindow.</param>
/// <param name="name">The name of the template child.</param>
/// <param name="direction">The direction.</param>
public static void SetWindowChromeResizeGripDirection(this MetroWindow window, string name, ResizeGripDirection direction)
{
if (window == null)
{
throw new ArgumentNullException(nameof(window));
}
var inputElement = window.GetPart(name) as IInputElement;
Debug.Assert(inputElement != null, $"{name} is not a IInputElement");
if (WindowChrome.GetResizeGripDirection(inputElement) != direction)
{
WindowChrome.SetResizeGripDirection(inputElement, direction);
}
}
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));
}