is it possible to display a Modal Window from a WPF User Control, that is a child of an ElementHost, and set the owner/parent of the Modal Window to the containing Form control?
I'm guessing you can't do this, as the Owner property takes an instance of Window, where as I want to set it to the parent of the Element Host control, which is an old Windows Forms Form control. Just wondering if there is a work around or alternative approach.
The problem is when the Modal Window is displayed and the user switches to another application, then back again, the Modal Window is hidden and the user is unable to interact with the main Window. This is due to Windows thinking the Modal Window is still displayed, when it isn't, as there is no Owner/Parent relationship set.
Cheers,
James.
I'm using WindowInteropHelper to solve that problem like this:
var wpfDialog = new MyWpfDialog();
var interopHelper = new WindowInteropHelper(wpfDialog)
{
Owner = winFormsDialog.Handle
};
wpfDialog.ShowDialog();
I know this post is old, but I came across a way to find the winform window that is hosting the ElementHost from the context of a wpf UserControl where you may not have access to the winform window. I found this to be useful so that I don't have to pass the host window around.
HwndSource winformWindow = (System.Windows.Interop.HwndSource.FromDependencyObject(wpfControlInElementHost) as System.Windows.Interop.HwndSource);
if (winformWindow != null)
{
var interopHelper = new WindowInteropHelper(wpfWindow)
{
Owner = winformWindow.Handle
};
}
Ok just found the solution using WindowInteropHelper.
http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/44c903fb-9514-401c-ba85-58acd5293c1b
Related
Hi I have one VSIX project. I have added a WPF form to that project for UI .
and set show in taskbar=false for that wpf window.While executing the project, it has been shown in the main window of experimental instance no issues with that. But when i switch over to another window and return back to the Experimental instance window the wpf window get disappeared.How can i fix this?
Finally the issue has been fixed by the below snippet.
Form = new MainWindow();
Form.Owner = Application.Current.MainWindow;
Form.ShowDialog();
I am working with a WPF application.I have two text boxes and a button in my first window.Based on some DB operations i need to open the copy of the first window(if possible open like a new tab) provided both windows can be accessed simultaneously.I used
var MainWindow = new MainWindow();
MainWindow.ShowDialog();
and
var MainWindow = new MainWindow();
MainWindow.Show();
both of them doesnt meet my expectations.Can anyone help me.
When you use ShowDialog(), it opens a single modal dialog that is expected to be closed when complete.
If you want to open multiple windows and not block form control, try using Show() instead.
var window = new MainWindow();
window.Show();
I would advise you to read all of the relating pages on MSDN so that you can learn how everything works.
For the Show method:
Opens a window and returns without waiting for the newly opened window to close.
For the ShowDialog method:
Opens a window and returns only when the newly opened window is closed.
From the Remarks section of the Window.Show Method page:
When the Window class is instantiated, it is not visible by default. Show shows a window and returns immediately, without waiting for the window to be closed. Consequently, the opened window does not prevent users from interacting with other windows in the application. This type of window is called a modeless window. Common examples of modeless windows are properties windows, toolboxes, and palettes. To restrict a user to interacting with a specific window, the window must be opened by calling ShowDialog.
Calling Show achieves the same end result as setting Visibility property of the Window object to Visible. However, there is a difference between the two from a timing perspective.
Therefore, for your solution, I would recommend that you use the Show method instead.
i'm relative new to MVVM. My current problem is a modular dialog which should "autostart" at the beginning.
I've followed the example of WAFs Email Client for modular dialogs. Is it right that the only important thing is to set the Owner Property of the dialog to the instance of the main window of the application (and of course show the window with ShowDialog() instead of Show()?
If you close this dialog without configuration the application will shutdown. But now, if I open the main window in visual studios designer mode the configuration dialog comes up and if I close it visual studio crashes.
This is because I call the ShowDialog() of the configuration dialog in the constructor of my main windows view model.
To avoid this i can check for DesignerProperties.IsInDesignTool Property, but this is more a workaround as good code style, right?
Do you have any suggestions? Thanks.
The problem here is that you are showing a dialog in the constructor of a class. That's something you don't want to do.
I would solve it like this:
Don't specify a StartupUri in your app.xaml but override OnStartup. There you check whether the configuration dialog should be shown or not. If it should be shown, show it and after it has closed with OK, show you main window.
Something like this:
override void OnStartup(...)
{
if(configurationNotComplete)
{
ConfigDialog cfg = new ConfigDialog();
if(!(cfg.ShowDialog() ?? false))
{
Shutdown();
return;
}
}
MainWindow window = new MainWindow();
window.Show();
}
You have another problem with your current approach: Your ViewModel shows a modal dialog. This means it knows at least about one View: That of the modal dialog. MVVM is one way: The View knows about the ViewModel, the ViewModel knows about the Model. There should be no connection in the other direction.
I've read about it in a bunch of places. Most of the people are referring to these two links:
How do I handle opening and closing new Windows with MVVM?
http://waf.codeplex.com/
I don't understand either of them. I am a beginner when it comes to MVVM. Some people are mentioning controllers when it comes to window manipulation in MVVM. What are those and how are they implemented? By book, MVVM is consisted of model, viewmodel and view - where do controllers come in?
If someone could provide a sample of the following use case, that would be terrific (for all those people who are just getting started with this, as I am):
Prerequisite: A window is opened.
User clicks a button.
New window is opened and some data is passed to that window, i.e. some string.
New window is closed (or a button is clicked) and some data is passed to the first
window.
Passed data has changed something on the window.
The ViewModel to ViewModel communication is usually handled by an implementation of the Event Aggregator pattern.
MVVM Light uses the Messenger class, Prism has another implementation but basically that is one way to send messages between View Models without coupling.
There are some examples, and Articles describing the usage.
I would suggest taking a look at it.
Regarding the controllers stuff in WPF, I don't know.
Regarding the example:
-I Have a Windows with its WindowsViewModel. This class should have a Command bound to the Button.
-The user clicks the button. Executes the command.
-The Command opens a new Window.
Here you should create the Dialog View Model and somehow you should create the Window. Or create the Window with a ViewModel, but ViewModel shouldn't know much about the View otherwise is not testable.
We use something like this because we have some requirements, but it
could be much much simplier, it happens it's the only example I have at hand:
bool? ShowDialogImpl<TViewModel>(Action<TViewModel> setup) where TViewModel : ViewModel
{
return (bool?)DispatcherHelper.UIDispatcher.Invoke(
(Func<bool?>)(() =>
{
var viewModel = viewModelFactory.Get<TViewModel>();
viewModel.ViewService = this;
setup(viewModel);
var window = new Window
{
Owner = this,
SizeToContent = SizeToContent.WidthAndHeight,
WindowStartupLocation = WindowStartupLocation.CenterOwner,
Content = ViewFactory.CreateView<TViewModel>(),
DataContext = viewModel,
WindowStyle = WindowStyle.ToolWindow,
ShowInTaskbar = false
};
window.SetBinding(TitleProperty, new Binding("Title"));
openDialogs.Push(window);
window.Activated += (sender, args) => window.SizeToContent = SizeToContent.Manual;
var result = window.ShowDialog();
openDialogs.Pop();
viewModelFactory.Release(viewModel);
return result;
}));
}
Basically: We create a window and with a view model.
The view model is created from a factory using an container.
The setup Action delegate is the entry point for our data.
Communication:
The first Windows is a Grid, and the second Dialog to edit data of the grid.
Inf the Windows we have:
messenger.Register<EntityUpdated<FooClass>>(this, message => UpdateItem(message.Entity));
And in the Dialog:
messenger.Send(new EntityUpdated<FooClass>(subject));
This way, we know when something was updated in the Edit Dialog in order to refresh the grid.
Hope this help you :)
If you aren't planning on allowing the user to switch back and forth between the windows, while both are open (i.e., the first opens the second, and the second must be closed to return to the first), you could simply set the viewmodel for both windows to the same viewmodel instance, and open the 2nd window as modal, and the strings you are passing back and forth, would simply be properties of the view model, with data bindings to something in the view.
Im developing some wpf app. Basically i have two types of windows: search windows and insert/edit windows. When i developed win forms apps, i used a trick, called MdiParent. In that way i had ability to put my caled search type windows in a "stack". In orher words if i called 5 different search windows from meniu, they apeared in a component like tab control, one after other.By clicking on that tabs, i could see search results of clicked tab window. The trick as i said was MdiParent technique, like:
private ProductDiscount frmProductDiscount = null;
private void ProductDiscountToolStripMenuItem_Click(object sender, EventArgs e)
{
if ((frmProductDiscount == null) || (!frmProductDiscount.Visible))
{
frmProductDiscount = new ProductDiscount();
frmProductDiscount.MdiParent = this;
frmProductDiscount.Show();
}
else
{
frmProductDiscount.Activate();
}
}
So does anyone can me suggest a good way to implement such a window organization technique in WPF and put some links or examples..?That would be a big help for me.
There is no equivalent of Form.MDIParent in WPF and MDI does not support the idea of an MDI layout. You can set a Windows Owner to another window. This will minimise the child when the parent is minimised.
For an example of MDI style functionality have a look at this thread link text
where Marlon Grech has written something similar to what I believe you are trying to do.
We developped similar application, as WPF doesnt have any default MDI framework but since its completely customizable, what you can do is, you can create User Controls of your "Window" instead of Window type and you can use inside a TabControl and you can customize TabControl to have close buttons etc. Windows in Tabs as they appear in Visual Studio, IE etc, they work good for this type of scenario when you dont want to block user input on modal dialog.