private void OnStateChanged(object sender, EventArgs e)
{
var screen = Screen.FromHandle(new WindowInteropHelper(this).Handle);
var thickness = new Thickness(0);
if (WindowState != WindowState.Maximized)
{
var currentDpiScaleFactor = SystemHelper.GetCurrentDPIScaleFactor();
var workingArea = screen.WorkingArea;
MaxHeight = (workingArea.Height + 16) / currentDpiScaleFactor;
MaxWidth = double.PositiveInfinity;
if (WindowState != WindowState.Maximized)
{
SetMaximizeButtonsVisibility(Visibility.Visible, Visibility.Collapsed);
}
}
else
{
thickness = GetDefaultMarginForDpi();
if (_previousState == WindowState.Minimized ||
Math.Abs(Left - _positionBeforeDrag.X) < DoubleTolerance &&
Math.Abs(Top - _positionBeforeDrag.Y) < DoubleTolerance)
{
thickness = GetFromMinimizedMarginForDpi();
}
SetMaximizeButtonsVisibility(Visibility.Collapsed, Visibility.Visible);
}
_layoutRoot.Margin = thickness;
_previousState = WindowState;
}
protected CustomWindow()
{
var currentDpiScaleFactor = SystemHelper.GetCurrentDPIScaleFactor();
var screen = Screen.FromHandle(new WindowInteropHelper(this).Handle);
SizeChanged += OnSizeChanged;
StateChanged += OnStateChanged;
Loaded += OnLoaded;
var workingArea = screen.WorkingArea;
MaxHeight = (workingArea.Height + 16) / currentDpiScaleFactor;
SystemEvents.DisplaySettingsChanged += SystemEvents_DisplaySettingsChanged;
AddHandler(MouseLeftButtonUpEvent, new MouseButtonEventHandler(OnMouseButtonUp), true);
AddHandler(MouseMoveEvent, new MouseEventHandler(OnMouseMove));
}
private void OnMouseMove(object sender, MouseEventArgs e)
{
if (!_isMouseButtonDown)
{
return;
}
var currentDpiScaleFactor = SystemHelper.GetCurrentDPIScaleFactor();
var position = e.GetPosition(this);
var screen = PointToScreen(position);
var x = _mouseDownPosition.X - position.X;
var y = _mouseDownPosition.Y - position.Y;
if (Math.Sqrt(Math.Pow(x, 2) + Math.Pow(y, 2)) > 1)
{
var actualWidth = _mouseDownPosition.X;
if (_mouseDownPosition.X <= 0)
{
actualWidth = 0;
}
else if (_mouseDownPosition.X >= ActualWidth)
{
actualWidth = _widthBeforeMaximize;
}
if (WindowState == WindowState.Maximized)
{
ToggleWindowState();
Top = (screen.Y - position.Y) / currentDpiScaleFactor;
Left = (screen.X - actualWidth) / currentDpiScaleFactor;
CaptureMouse();
}
_isManualDrag = true;
Top = (screen.Y - _mouseDownPosition.Y) / currentDpiScaleFactor;
Left = (screen.X - actualWidth) / currentDpiScaleFactor;
}
}
