public void Show(PopupItem item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (this.VerifyIsMessageDialogBox(item))
{
throw new Exception($"视图类型 {typeof(MessageDialogBox)} 必须以模态方式进行显示。");
}
//堆栈最上层若是模态窗口，则不予显示当前窗口，并激活最上层的模态窗口
if (this.VerifyTopItemModal())
{
if (!this.VerifyIsProcessDialogBox(item))
{
PopupItemContainer container = this.PopupContainerFromIndex(this._popupStack.Items.Count - 1);
if (container != null)
{
container.Flicker();
}
return;
}
}
if (!this.Contains(item))
{
item.VerifyCanShow(this);
item.InternalShowing(out CancelEventArgs ce);
if (!ce.Cancel)
{
item._isClosed = false;
item.ParentHostStack = this;
this.AddItem(item);
item.InternalShown(out EventArgs e);
}
}
else
{
this.MoveItemToTop(item);
}
}
public ModalResult ShowModal(PopupItem item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (this.VerifyIsProcessDialogBox(item))
{
throw new Exception($"视图类型 {typeof(ProcessDialogBox)} 不可以模态方式进行显示。");
}
//以模态显示窗口时，若发现最上层是模态窗口
//当顶级窗口为MessageDialogBox时不予显示当前窗口
//当顶级窗口不是MessageDialogBox时，若当前为MessageDialogBox，则显示
if (this.VerifyTopItemModal())
{
if (this.VerifyTopItemIsMessageDialogBox() ||
!this.VerifyIsMessageDialogBox(item))
{
PopupItemContainer container = this.PopupContainerFromIndex(this._popupStack.Items.Count - 1);
if (container != null)
{
container.Flicker();
}
return(null);
}
}
item.VerifyCanShow(this);
item._showingAsModal = true;
item._modalResult = null;
CancelEventArgs ce = null;
try
{
item.InternalShowing(out ce);
}
catch (Exception)
{
item._showingAsModal = false;
throw;
}
try
{
if (!ce.Cancel)
{
ComponentDispatcher.PushModal();
item._dispatcherFrame = new DispatcherFrame();
item.ParentHostStack = this;
item._isClosed = false;
this.AddItem(item);
item.InternalShown(out EventArgs e);
Dispatcher.PushFrame(item._dispatcherFrame);
return(item.ModalResult);
}
}
finally
{
ComponentDispatcher.PopModal();
item.InternalDiapose();
}
return(null);
}