public override void RunLayout(MDIContainer container)
{
if (container == null)
{
return;
}
if (!container.Items.Children.Any())
{
return;
}
var items = container.Items.Children;
MDIChild lastItem = null;
for (var i = 0; i < items.Count; i++)
{
var item = (MDIChild)items[i];
Canvas.SetLeft(item, i * 30);
Canvas.SetTop(item, i * 30);
if (Resize && item.FormBorderStyle != FormBorderStyle.Fixed)
{
item.Width = container.DefaultChildWidth;
item.Height = container.DefaultChildHeight;
}
lastItem = item;
}
lastItem?.Activate();
}
private void CreateChildEventHandlers(MDIChild child)
{
child.Restored += ChildOnRestored;
child.Closed += ChildOnClosed;
child.Activating += ChildOnActivating;
child.MinimizeButton.Click += OnMinimizeButtonOnClick;
child.Activated += OnChildOnActivated;
}
private void RemoveChildEventHandlers(MDIChild child)
{
child.Loaded -= ChildOnLoaded;
child.Restored -= ChildOnRestored;
child.Activating -= ChildOnActivating;
child.MinimizeButton.Click -= OnMinimizeButtonOnClick;
child.Activated -= OnChildOnActivated;
child.Closed -= ChildOnClosed;
}
private void ChildOnRestored(object o, MDIChild child)
{
if (child.PreviousFormWindowState != FormWindowState.Minimized)
{
return;
}
MinimizedItems.Items?.Remove(child);
Items.Children.Add(child);
}
private void ChildOnActivating(object mdiChild, MDIChild mdiChildControl)
{
foreach (var item in Items.Children.Where(x => x != mdiChild))
{
if (item is MDIChild control)
{
control.Deactivate();
}
}
}
private MDIChild CreateMdiControl(Control control)
{
var child = new MDIChild(control)
{
Width = double.IsNaN(control.Width) ? DefaultChildWidth : control.Width,
Height = double.IsNaN(control.Height) ? DefaultChildHeight : control.Height
};
return(child);
}
private void ChildOnClosed(object sender, MDIChild child)
{
if (child.FormWindowState == FormWindowState.Minimized)
{
MinimizedItems.Items?.Remove(child);
}
else
{
Items.Children.Remove(child);
}
RemoveChildEventHandlers(child);
}
private static void HandleStartPosition(Control control, MDIChild child, MDIContainer mdiContainer)
{
double startLeft;
double startTop;
var startPosition = FormStartPosition.WindowsDefaultLocation;
var apStart = control.GetValue(FormProperties.FormStartPositionProperty);
if (apStart != null)
{
startPosition = (FormStartPosition)apStart;
}
if (startPosition == FormStartPosition.CenterParent)
{
var screenWidth = mdiContainer.ActualWidth;
var screenHeight = mdiContainer.ActualHeight;
var windowWidth = child.Width;
var windowHeight = child.Height;
startLeft = screenWidth / 2 - windowWidth / 2;
startTop = screenHeight / 2 - windowHeight / 2;
}
else if (startPosition == FormStartPosition.CenterScreen)
{
var displaySize = Helpers.GetCurrentDisplaySize();
var screenWidth = displaySize.Width;
var screenHeight = displaySize.Height;
var windowWidth = child.Width;
var windowHeight = child.Height;
startLeft = screenWidth / 2 - windowWidth / 2;
startTop = screenHeight / 2 - windowHeight / 2;
}
else
{
var screenWidth = mdiContainer.ActualWidth;
var screenHeight = mdiContainer.ActualHeight;
var windowWidth = child.Width;
var windowHeight = child.Height;
var maxLeft = screenWidth / 2 - windowWidth / 2;
var maxTop = screenHeight / 2 - windowHeight / 2;
var rnd = new Random();
startLeft = rnd.Next(0, (int)maxLeft);
startTop = rnd.Next(0, (int)maxTop);
}
Canvas.SetLeft(child, startLeft);
Canvas.SetTop(child, startTop);
}
private void OnChildOnActivated(object sender, MDIChild mdiChild)
{
}
private static void ConfigureMdiControl(Control control, MDIChild child, MDIContainer mdiContainer)
{
HandleStartPosition(control, child, mdiContainer);
}