/// <summary>
/// Show the MDI child with the passed handle.
/// Opening event will be raised on the child.
/// If the MDI child is already open (Show called previously),
/// then it will be Activated.
/// </summary>
/// <param name="child"></param>
public void Show(IMDIChild childItem)
{
MDIChild child = childItem as MDIChild;
// sanity check
if (child == null)
{
throw new ArgumentException("Show child cannot be null");
}
// check if mdi child has been shown previously
if (mdiChildren.Contains(child))
{
// activate it
Activate(child);
return;
}
// add to children
mdiChildren.Add(child);
mdiParent.Items.Add(child.TabItem);
// bring to front
mdiParent.SelectedItem = child.TabItem;
// raise opening event
child.RaiseOpening();
}
/// <summary>
/// Close the MDI child with the passed handle.
/// Closing and Closed events will be raised on child.
/// Close can be cancelled by handling the Closing event Cancel property.
/// </summary>
/// <param name="child"></param>
public void Close(IMDIChild childItem)
{
MDIChild child = childItem as MDIChild;
// sanity check
if (child == null)
{
throw new ArgumentException("Activate child cannot be null");
}
if (!mdiChildren.Contains(child))
{
throw new InvalidOperationException("Cannot call Close on a child which has not been Show(n)");
}
// invoke Closing event
CancelEventArgs args = new CancelEventArgs();
child.RaiseClosing(args);
// check if close has been aborted
if (args.Cancel)
{
return;
}
// close/remove
mdiChildren.Remove(child);
mdiParent.Items.Remove(child.TabItem);
// raise Closed event
child.RaiseClosed();
}
// invoked when TabItem header close X button is clicked
private void cmdTabItemCloseButton_Click(object sender, RoutedEventArgs e)
{
// see XAML, tabitem is bound to Tag property
TabItem tabItem = ((Button)sender).Tag as TabItem;
MDIChild child = null;
// find the MDIChild corresponding to this TabItem
foreach (MDIChild c in mdiChildren)
{
if (c.TabItem == tabItem)
{
child = c;
break;
}
}
// sanity check
if (child == null)
{
// fail-safe - we assume that this TabItem was never
// added as a MDI child
// so we just remove it
mdiParent.Items.Remove(tabItem);
return;
}
// invoke close on the child
Close(child);
}
/// <summary>
/// Bring to front the MDI child with the passed handle.
/// </summary>
/// <param name="child"></param>
public void Activate(IMDIChild childItem)
{
MDIChild child = childItem as MDIChild;
// sanity check
if (child == null)
{
throw new ArgumentException("Activate child cannot be null");
}
if (!mdiChildren.Contains(child))
{
throw new InvalidOperationException("Cannot call Activate on a child which has not been Show(n)");
}
// activate
mdiParent.SelectedItem = child.TabItem;
}
