我的应用程序有几个独立的“顶级”窗口,它们都具有完全不同的功能/工作流程。
我目前正在使用ShowDialog()来制作WPF窗口模式。模态窗口是其中一个主窗口的子窗口。但是,它一旦打开就会阻止所有顶级窗口。我希望该对话框仅阻止它从中启动的父窗口。这可能吗?
我不确定它是否重要,但打开对话框的窗口是应用程序的初始窗口 - 所以所有其他顶级窗口都是从它打开的。
答案 0 :(得分:11)
一个选项是在不同的线程上启动您不希望受对话框影响的窗口。这可能会导致您的应用程序出现其他问题,但如果这些窗口确实封装了不同的工作流程,那么这可能不是问题。下面是我编写的一些示例代码,用于验证这是否有效:
<Window x:Class="ModalSample.MyWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="{Binding Identifier}" Height="150" Width="150">
<StackPanel>
<TextBox Text="{Binding Identifier}" />
<Button Content="Open Normal Child" Click="OpenNormal_Click" />
<Button Content="Open Independent Child" Click="OpenIndependent_Click" />
<Button Content="Open Modal Child" Click="OpenModal_Click" />
</StackPanel>
</Window>
using System.ComponentModel;
using System.Threading;
using System.Windows;
namespace ModalSample
{
/// <summary>
/// Interaction logic for MyWindow.xaml
/// </summary>
public partial class MyWindow : INotifyPropertyChanged
{
public MyWindow()
{
InitializeComponent();
DataContext = this;
}
private int child = 1;
private string mIdentifier = "Root";
public string Identifier
{
get { return mIdentifier; }
set
{
if (mIdentifier == value) return;
mIdentifier = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("Identifier"));
}
}
private void OpenNormal_Click(object sender, RoutedEventArgs e)
{
var window = new MyWindow {Identifier = Identifier + "-N" + child++};
window.Show();
}
private void OpenIndependent_Click(object sender, RoutedEventArgs e)
{
var thread = new Thread(() =>
{
var window = new MyWindow {Identifier = Identifier + "-I" + child++};
window.Show();
window.Closed += (sender2, e2) => window.Dispatcher.InvokeShutdown();
System.Windows.Threading.Dispatcher.Run();
});
thread.SetApartmentState(ApartmentState.STA);
thread.Start();
}
private void OpenModal_Click(object sender, RoutedEventArgs e)
{
var window = new MyWindow { Identifier = Identifier + "-M" + child++ };
window.ShowDialog();
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
我找到了this blog post来在不同的线程上运行WPF窗口。
答案 1 :(得分:7)
我遇到了同样的问题并实现了这篇文章中描述的模态对话框行为: http://social.msdn.microsoft.com/Forums/vstudio/en-US/820bf10f-3eaf-43a8-b5ef-b83b2394342c/windowsshowmodal-to-parentowner-window-only-not-entire-application?forum=wpf
我还尝试了多UI线程方法,但这会导致第三方库(caliburn micro&amp; telerik wpf控件)出现问题,因为它们不是为在多个UI线程中使用而构建的。可以使它们使用多个UI线程,但我更喜欢更简单的解决方案...
如果按照描述实现对话框,则不能再使用DialogResult属性,因为它会导致“只有在创建Window并显示为对话框”异常后才能设置“DialogResult”。只需实现自己的属性并使用它。
您需要以下Windows API参考:
/// <summary>
/// Enables or disables mouse and keyboard input to the specified window or control.
/// When input is disabled, the window does not receive input such as mouse clicks and key presses.
/// When input is enabled, the window receives all input.
/// </summary>
/// <param name="hWnd"></param>
/// <param name="bEnable"></param>
/// <returns></returns>
[DllImport("user32.dll")]
private static extern bool EnableWindow(IntPtr hWnd, bool bEnable);
然后使用:
// get parent window handle
IntPtr parentHandle = (new WindowInteropHelper(window.Owner)).Handle;
// disable parent window
EnableWindow(parentHandle, false);
// when the dialog is closing we want to re-enable the parent
window.Closing += SpecialDialogWindow_Closing;
// wait for the dialog window to be closed
new ShowAndWaitHelper(window).ShowAndWait();
window.Owner.Activate();
这是在关闭对话框时重新启用父窗口的事件处理程序:
private void SpecialDialogWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
var win = (Window)sender;
win.Closing -= SpecialDialogWindow_Closing;
IntPtr winHandle = (new WindowInteropHelper(win)).Handle;
EnableWindow(winHandle, false);
if (win.Owner != null)
{
IntPtr parentHandle = (new WindowInteropHelper(win.Owner)).Handle;
// reenable parent window
EnableWindow(parentHandle, true);
}
}
这是实现模式对话行为所需的ShowAndWaitHelper(这会阻止线程的执行,但仍会执行消息循环。
private sealed class ShowAndWaitHelper
{
private readonly Window _window;
private DispatcherFrame _dispatcherFrame;
internal ShowAndWaitHelper(Window window)
{
if (window == null)
{
throw new ArgumentNullException("window");
}
_window = window;
}
internal void ShowAndWait()
{
if (_dispatcherFrame != null)
{
throw new InvalidOperationException("Cannot call ShowAndWait while waiting for a previous call to ShowAndWait to return.");
}
_window.Closed += OnWindowClosed;
_window.Show();
_dispatcherFrame = new DispatcherFrame();
Dispatcher.PushFrame(_dispatcherFrame);
}
private void OnWindowClosed(object source, EventArgs eventArgs)
{
if (_dispatcherFrame == null)
{
return;
}
_window.Closed -= OnWindowClosed;
_dispatcherFrame.Continue = false;
_dispatcherFrame = null;
}
}