I have several controls in my silverlight view including telerik and my own controls(Custom controls).in this view there is a TextBox called AppointmentSubject which needs to be focused when i open this view.this textbox is also a custom control.I did following thing inside the View_Loaded method.
System.Windows.Browser.HtmlPage.Plugin.Focus();
//TextBoxName.Focus()
AppointmentSubject.Focus();
But AppointmentSubject only gets focused when i open the view second time.Any idea how i achieve it right first time?
I have a MainWindow in my WPF app.
This MainWindow has a menu on the left and when a menu option is selected a UserControl is loaded on the right.
This is similar to Master Pages in asp.net
What I want to do now is to have a modal window show from the UserControl which will only allow the user to interact with the modal window.
I have seen examples of the Main Window showing a modal window (http://www.codeproject.com/Articles/36516/WPF-Modal-Dialog) but not sure on how to load this from a UserControl.
There's this: dialogs and mvvm but this is the best example I've seen of dealing with it: mvvm and closing forms
The first link I've not used and stumbled across while looking for the second link to post that here. The second link has two downloads, you can ignore the _service download, it's basically the same.
One way in WPF is this method
Add a new Window to the project.
Add other controls onto the window as needed.
In XAML name the window such as x:Name="MyWindow"
Put on Dependency properties on the window and have each of the controls bind to the window's data context such as {Binding MyText, ElementName=MyWindow}. (Note I still use, even for WPF these Visual Studio code snippets to add different dependency properties, these save time for a very redundant operations of adding them: Silverlight Snippets.
In the location where you want to launch the model dialog use this example:
Example:
var about = new About(); // Create the new window
// I've added a CompanyName dependency property.
about.CompanyName = "OmegaMan Industries";
about.ShowDialog();
I have a WinForms menuitem and I need that on menu click the new WPF dialog is loaded.
How do I do this?
Thanks
You should be able to display it by creating a new instance of the WPF class for the dialog, and then calling its ShowDialog() method.
The only trick is properly setting the owner of the WPF dialog. You can't just set the Owner property directly, since that requires a WPF window. However, you can use the class System.Windows.Interop.WindowInterpHelper to get around this:
MyWpfDialog dialog = new MyWpfDialog();
new System.Windows.Interop.WindowInteropHelper(dialog).Owner = this.Handle;
dialog.ShowDialog();
(I got the code sample from http://blog.stpworks.com/archive/2009/07/02/setting-wpf-dialog-owner-from-within-winforms-application.aspx.)
I have senario in which one view and view has binding with multiple ViewModel.
Eg. One View displaying Phone Detail and ViewModel as per bellow:
Phone basic features- PhoneViewModel,
Phone Price Detail- PhoneSubscriptionViewModel,
Phone Accessories- PhoneAccessoryViewModel
For general properties- PhoneDetailViewModel
I have placed View's general properties to PhoneViewModel.Now senario is like this:
By default View displays Phone Basic feaures which is bind with ObservationCollection of PhoneViewModel. My view have button - 'View Accessories', onclick of this button one popup screen- in my design I have display/hide Grid and bind it with ObservationCollection of PhoneAccessoryViewModel.
Now problem begins- Accessory List also have button 'View Detail' onclick I have to open one popup screen, here also I had placed one Grid and Visible/Hide it. I have bind 'ViewAccessoryDetailCommand' command to 'View Detail' button. And on command execution one function fires and set property which Visible the Popup screen.
Using such programming command fires, function calls but the property change not raises and so my view does not display popup.
Summary:
One View--> ViewModel1-->Grid Bind view ViewModel2 -->Grid Have Button and Onclick display new Grid which binded with ViewModel3-this Command fires but property not raises.
I think there is some problem in my methodology, Please, give your suggetions.
I'm not sure I completely follow what you are trying to ask, but I'll have a go at answering.
I posted an answer to (possibly) a similar question yesterday.
See
Query on MVVM pattern in WPF?
and
MVVM - what is the ideal way for usercontrols to talk to each other
I'm not sure if it does, but I hope this helps.
In WPF a View is connected to a ViewModel by setting the DataContext of the View to the ViewModel.
Since each control can only have one DataContext a View can only have one ViewModel.
I have implemented my MVVM error message as a message dialog that subscribes to error messages via a mediator class, so that other viewmodels can notify it if any errors occur.
When an error occurs, I set the visibility attribute in the viewmodel to Visible, to display the error window. This is all bound in the Error window from the viewmodel.
However, this window is NOT modal! I need to show it as a dialog and not just set the visibility to true - is there any kind of binding I can do, even if I have to extend the functionality of the window? I'd rather not break MVVM if I can avoid it.
Thanks!
The View/ViewModel split is meant to divide look from functionality. I firmly believe the Window is functionality and look rolled into one. For instance, what if in your ErrorMessageViewModel, you had this code that executes when there are errors:
class WindowViewModel : Window
{
}
.
.
.
WindowViewModel newDialog = new WindowViewModel();
newDialog.Content = myErrorListViewModel;
newDialog.Parent = mainWindowViewModel;
newDialog.ShowDialog();
So the contents of the dialog is the ViewModel for your error list. Define your View as a data template that automatically applies itself to the error list ViewModel.
Doesn't that look like MVVM?
The fact is, the Window class is a ViewModel for the Window you see on the screen. By changing the properties of the Window object, it affects the "view" just like if the properties of the WindowView were bound to a WindowViewModel. The only thing missing is the ability to "restyle" the Window using WPF, and it doesn't matter how hard you try to implement it, you're not going to be able to do that. The user can restyle a Window by modifying their desktop theme, but you're not in control of it. The best you can do is turn off the chrome and/or make it full screen.
You find an example how windows (don't matter if they are modal or not) are shown, in the ViewModel example of this project:
WPF Application Framework (WAF)
http://waf.codeplex.com
I am also working on a MVVM project where I need modal dialogboxes or messageboxes. I have found the following way of solving it:
The software uses only one window. The layout root element is a Grid with no row- or columndefinitions. The grid has three children:
A dockpanel that contains all the usual stuff like menus, tabbed views, status bar and so on.
A grid that has a gray background and a 50% opacity. This is used as a veil to cover the dockpanel when a modal box is in effect. The veil grid is usually collapsed.
A grid holding modal views, this is usually collapsed.
The viewmodel for the main window has a member called Modal. If this is null, the two grids for modal use are collapsed through databinding and a converter for Visibility.Collapsed.
When the program wants to display for example a modal message box, a MessageBoxViewModel is instantiated and assigned to MainViewModel.Modal. The MessageBoxViewModel has a Command for an OK-button. This Command raises an event that sets the MainViewModel.Modal to null again.
The veil grid occludes the main DockPanel, so that no controls outside the Modal control accept input.
Your program can either run a messagepump until OK is pressed, or the OK-Command can trigger the next. There are many ways of solving different needs, but the Model-ModelView solution should support them.
I feel that this is as good a model of the view in the modal mode as one can hope for.
I made a behhavior to tie some modal dialogs to the command.
http://www.clr-namespace.com/post/MVVMModal-dialog-before-running-Command.aspx
<Confirm:Confirm IsConfirm="{Binding ElementName=checkBoxConfirm, Path=IsChecked}"
Command="{Binding Path=ButtonCommand}"
CommandParameter="{Binding ElementName=textBoxParameter, Path=Text}"
ConfirmMessage="Are you sure you want to fire the command?"
ConfirmCaption="Question" >
</Confirm:Confirm>
In my recent blog post you can find simple solution for Modal Dialogs and Message Boxes in MVVM for Silverlight but this can be simply reused in WPF:
Modal dialogs with MVVM and Silverlight 4
i'm using the same method as Scott Whitlock.
there is just one more important property to set:
class ModalDialog: Window
{
}
.
.
.
var dlg = new ModalDialog {
Content = viewModelName,
**TopMost = true,**
Parent = mainWindowViewModel
};
dlg.ShowDialog();