/// <summary>
/// Shows the window as a modal dialog
/// </summary>
public DialogResult ShowDialog()
{
this.Parent = WindowElement.ModalContainerPanel;
this.isModal = true;
this.LockKeyboardNavigation();
this.LockMouseOutside();
this.Show();
// Set DialogResult default value
this.DialogResult = DialogResult.None;
try
{
// Push the current thread to a modal state
ComponentDispatcher.PushModal();
// Create a DispatcherFrame instance and use it to start a message loop
this.dispatcherFrame = new DispatcherFrame();
Dispatcher.PushFrame(this.dispatcherFrame);
}
finally
{
// Pop the current thread from modal state
ComponentDispatcher.PopModal();
}
return(this.DialogResult);
}
private static TResult PushFrame <TResult>(IDispatcherService dispatcher, Func <Task <TResult> > task)
{
return(dispatcher.Invoke(() =>
{
var frame = new DispatcherFrame();
var frameTask = task().ContinueWith(x => { frame.Continue = false; return x.Result; });
ComponentDispatcher.PushModal();
Dispatcher.PushFrame(frame);
ComponentDispatcher.PopModal();
return frameTask.Result;
}));
}
public static void Enter(ModalStateCancellationToken cancellationToken)
{
try
{
ComponentDispatcher.PushModal();
Dispatcher.PushFrame(cancellationToken.DispatcherFrame);
}
finally
{
ComponentDispatcher.PopModal();
}
}
public ModalResult ShowModal(PopupItem item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (this.VerifyIsProcessDialogBox(item))
{
throw new InvalidOperationException($"视图类型 {typeof(ProcessDialogBox)} 不可以模态方式进行显示。");
}
//以模态显示窗口时，若发现最上层是模态窗口
//当顶级窗口为MessageDialogBox时不予显示当前窗口
//当顶级窗口不是MessageDialogBox时，若当前为MessageDialogBox，则显示
if (this.VerifyTopItemModal())
{
if (this.VerifyTopItemIsMessageDialogBox() ||
!this.VerifyIsMessageDialogBox(item))
{
PopupItemContainer container = this.PopupContainerFromIndex(this._popupStack.Items.Count - 1);
if (container != null)
{
container.Flicker();
}
return(null);
}
}
this.VerifyCanShow(item);
item._isShowing = true;
item._showingAsModal = true;
item._modalResult = null;
CancelEventArgs ce = null;
try
{
item.InternalShowing(out ce);
}
catch (Exception)
{
//状态还原
item._isShowing = false;
item._showingAsModal = false;
throw;
}
bool notcanceled = !ce.Cancel;
try
{
if (notcanceled)
{
ComponentDispatcher.PushModal();
item._dispatcherFrame = new DispatcherFrame();
try
{
this.ShowCore(item);
}
finally
{
//确保Shown事件异常时，Modal的结果不受影响
Dispatcher.PushFrame(item._dispatcherFrame);
}
return(item.ModalResult);
}
}
finally
{
//确保ComponentDispatcher有进有出
if (notcanceled)
{
ComponentDispatcher.PopModal();
}
}
return(null);
}
public ModalResult ShowModal(PopupItem item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (this.VerifyIsProcessDialogBox(item))
{
throw new Exception($"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);
}
