private void OnMoveThumbDragDelta(object sender, DragDeltaEventArgs e)
{
var window = VisualTreeExtension.FindMdiWindow(this);
if (window != null)
{
if (window.WindowState == WindowState.Maximized)
{
window.Normalize();
}
if (window.WindowState != WindowState.Minimized)
{
window.LastLeft = Canvas.GetLeft(window);
window.LastTop = Canvas.GetTop(window);
var candidateLeft = window.LastLeft + e.HorizontalChange;
var candidateTop = window.LastTop + e.VerticalChange;
Canvas.SetLeft(window, Math.Min(Math.Max(0, candidateLeft), window.Container.ActualWidth - 25));
Canvas.SetTop(window, Math.Min(Math.Max(0, candidateTop), window.Container.ActualHeight - 25));
}
}
}
protected override void OnMouseDoubleClick(MouseButtonEventArgs e)
{
var window = VisualTreeExtension.FindMdiWindow(this);
if (window != null && window.Container != null)
{
switch (window.WindowState)
{
case WindowState.Maximized:
window.Normalize();
break;
case WindowState.Normal:
window.Maximize();
break;
case WindowState.Minimized:
window.Normalize();
break;
default:
throw new InvalidOperationException("Unsupported WindowsState mode");
}
}
e.Handled = true;
}
protected override void OnMouseDown(MouseButtonEventArgs e)
{
var window = VisualTreeExtension.FindMdiWindow(this);
if (window != null)
{
window.DoFocus(e);
}
base.OnMouseDown(e);
}
protected override void OnLostKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnLostKeyboardFocus(e);
FrameworkElement parent = VisualTreeExtension.FindMdiWindow(e.NewFocus as FrameworkElement);
if ((e.NewFocus is MdiWindow && !Equals(e.NewFocus, this)) || (parent != null && !Equals(parent, this)))
{
IsSelected = false;
Panel.SetZIndex(this, 0);
var newWindow = (e.NewFocus is MdiWindow) ? (e.NewFocus as MdiWindow) : (parent as MdiWindow);
Container.SetValue(MdiContainer.SelectedItemProperty, newWindow.DataContext);
newWindow.IsSelected = true;
}
}
private void OnResizing(object sender, DragDeltaEventArgs e)
{
var window = VisualTreeExtension.FindMdiWindow(this);
if (window != null)
{
if (window.IsFocused == false)
{
window.Focus();
}
window.Height = window.ActualHeight;
window.Width = window.ActualWidth;
switch (VerticalAlignment)
{
case VerticalAlignment.Bottom:
var deltaVertical = Math.Min(-e.VerticalChange, window.ActualHeight - window.MinHeight);
window.Height -= deltaVertical;
break;
case VerticalAlignment.Top:
deltaVertical = Math.Min(e.VerticalChange, window.ActualHeight - window.MinHeight);
Canvas.SetTop(window, Canvas.GetTop(window) + deltaVertical);
window.Height -= deltaVertical;
break;
}
switch (HorizontalAlignment)
{
case HorizontalAlignment.Left:
var deltaHorizontal = Math.Min(e.HorizontalChange, window.ActualWidth - window.MinWidth);
Canvas.SetLeft(window, Canvas.GetLeft(window) + deltaHorizontal);
window.Width -= deltaHorizontal;
break;
case HorizontalAlignment.Right:
deltaHorizontal = Math.Min(-e.HorizontalChange, window.ActualWidth - window.MinWidth);
window.Width -= deltaHorizontal;
break;
}
window.Container.InvalidateSize();
}
e.Handled = true;
}
private void OnMoveThumbDragDelta(object sender, DragDeltaEventArgs e)
{
var window = VisualTreeExtension.FindMdiWindow(this);
if (window != null)
{
if (window.WindowState == WindowState.Maximized)
{
return;
}
Canvas.SetLeft(window, Math.Max(0, Canvas.GetLeft(window) + e.HorizontalChange));
Canvas.SetTop(window, Math.Max(0, Canvas.GetTop(window) + e.VerticalChange));
window.Container.InvalidateSize();
}
}