public virtual void RemoveChild(GuiWidget childToRemove)
{
if (!Children.Contains(childToRemove))
{
throw new InvalidOperationException("You can only remove children that this control has.");
}
childToRemove.ClearCapturedState();
childToRemove.hasBeenRemoved = true;
Children.Remove(childToRemove);
childToRemove.parent = null;
childToRemove.OnParentChanged(null);
OnChildRemoved(new GuiWidgetEventArgs(childToRemove));
OnLayout(new LayoutEventArgs(this, null, PropertyCausingLayout.RemoveChild));
Invalidate();
}
public virtual void AddChild(GuiWidget childToAdd, int indexInChildrenList = -1)
{
#if DEBUG
if (childToAdd.hasBeenRemoved)
{
throw new Exception("You are adding a child that has previously been remove. You should probably be creating a new widget, or calling ClearRemovedFlag() before adding.");
}
#endif
if (indexInChildrenList == -1)
{
indexInChildrenList = Children.Count;
}
if (childToAdd == this)
{
BreakInDebugger("A GuiWidget cannot be a child of itself.");
}
if (indexInChildrenList > Children.Count)
{
throw new IndexOutOfRangeException();
}
if (Children.Contains(childToAdd))
{
throw new Exception("You cannot add the same child twice.");
}
if (childToAdd.Parent != null)
{
throw new Exception("This is alread the child of another widget.");
}
childToAdd.parent = this;
childToAdd.widgetHasBeenClosed = false;
Children.Insert(indexInChildrenList, childToAdd);
OnChildAdded(new GuiWidgetEventArgs(childToAdd));
childToAdd.OnParentChanged(null);
childToAdd.InitLayout();
OnLayout(new LayoutEventArgs(this, childToAdd, PropertyCausingLayout.AddChild));
}