MVVM for Windows 8

Edited Issue: Navigation parameter [1619]

mglukhankov — Tue, 28 May 2013 20:56:27 GMT

Add an overload for the NavigationState.Navigate method that accept a user defined parameter.
This parameter is useful when you want to include your page state into the navigation history.

public bool Navigate(
Type sourcePageType,
object parameter
)

Source code checked in, #28740

ygrik — Tue, 28 May 2013 19:35:35 GMT

updated library version

Created Release: v1.0.0.8 (May 28, 2013)

mglukhankov — Tue, 28 May 2013 18:30:53 GMT

Supported navigation parameter.
Added NavigationState.Navigate(Type pageType, object parameter) method.
NavigationState.Navigated raises on state loading.
Changed IPageModel interface.

Released: v1.0.0.8 (May 28, 2013)

Tue, 28 May 2013 18:30:53 GMT

Supported navigation parameter.
Added NavigationState.Navigate(Type pageType, object parameter) method.
NavigationState.Navigated raises on state loading.
Changed IPageModel interface.

Source code checked in, #28739

mglukhankov — Tue, 28 May 2013 18:20:59 GMT

Build # 1.0.0.8.

Source code checked in, #28738

mglukhankov — Tue, 28 May 2013 18:15:49 GMT

Changed IPageModel interface: OnNavigatingFrom, OnNavigatedFrom, OnNavigatedTo, added navigation param. Improoved the NavigationState class: state includes navigation param, Navigated/Navigating occur on state load.

Commented Issue: Navigation parameter [1619]

mglukhankov — Wed, 24 Apr 2013 20:28:48 GMT

I'm working on this issue.
Basically I have an implementation already.
The IPageModel interface is extended and its methods are renamed to match Page methods.
I'm not sure which notification methods should be called during SetNavigationState, GetNavigationState and Reset methods' calls. I'm trying to mimic the Page behavior.

New Post: ElementWrapper, care to elaborate a little ?

s093294 — Sun, 31 Mar 2013 01:00:53 GMT

I do want to databind, but could not make it work with selected items. I have a button and when it is clicked a new viewmodel is added to my TabItemsViewModelsCollection which will add a new tab to my TabControl. My Problem was to get the Command and CommandParameter to work on the button.

I had something like <button CommandParameter="{Binding SelectedItem ,ElementName=MyListView}" Command="{Binding OpenTabCommand}"> ...

While reproducing my error it hit me that the problem was i had bound it to SelectedItem isntead of Selecteditems, which made the eventcommand CanExecute return false and not being set to true. Changing it to SelectedItems and handing Count>0 in my Command delegate solved my problems.

Thanks for the discussion, helped me a lot.

New Post: ElementWrapper, care to elaborate a little ?

s093294 — Sun, 31 Mar 2013 01:00:53 GMT

New Post: ElementWrapper, care to elaborate a little ?

mglukhankov — Sun, 31 Mar 2013 00:52:11 GMT

Elements is protected on purpose so you cannot break the rules.

Do not use wrappers where you can use bindings. Selected items should be bound.

Multiple elements come from multiple bindings.

New Post: ElementWrapper, care to elaborate a little ?

mglukhankov — Sun, 31 Mar 2013 00:52:11 GMT

Elements is protected on purpose so you cannot break the rules.

Do not use wrappers where you can use bindings. Selected items should be bound.

Multiple elements come from multiple bindings.

New Post: ElementWrapper, care to elaborate a little ?

s093294 — Sat, 30 Mar 2013 23:49:25 GMT

Okay

I have a case here where i had a button that when clicked it should open a new tab in a tabcontrol based on the item selected in a listview.
First i tried to use a command, EventCommand and CommandParameter resulting in the button being set to disabled because canExecute returned false the first time when no items was selected in the list. Instead i tried binding just a command with a RelayCommand, but then i had to have a wrapper for the listview to get the selected item in my model.

So making the Elements public on the Wrapper was a lot easier then writing these intermediate layers, but i do see your argument.

I havent been able to figure out why you have a Set of Elements in the wrappers? In what situation can there be more than one element in a wrapper? My guess is that you can bind two elements to the same wrapper, but why would one do that?

New Post: ElementWrapper, care to elaborate a little ?

s093294 — Sat, 30 Mar 2013 23:49:25 GMT

New Post: ElementWrapper, care to elaborate a little ?

mglukhankov — Sat, 30 Mar 2013 22:59:28 GMT

This will break the whole idea of mvvm. A model should not know about its view.
But a wrapper is in an intermediate layer that can work without a view and can be replaced with something else in e.g. unit tests.

New Post: ElementWrapper, care to elaborate a little ?

mglukhankov — Sat, 30 Mar 2013 22:59:28 GMT

New Post: ElementWrapper, care to elaborate a little ?

s093294 — Sat, 30 Mar 2013 21:04:24 GMT

I have been using some of your ideas in my own WPF applicatino and Windows 8 store apps as i have found it intuitive to use.

But this question i havent been able to answer my self.

I get the idea of wrapping Views back to Model and your example for Focus is fine.
But why is the element protected in ElementWrapper, meaning that whenever someone want to do this on something else then focus he have to extend your code?

Would it not make sense to have the wrapper just expose the view element directly to be used in the model ?

New Post: ElementWrapper, care to elaborate a little ?

s093294 — Sat, 30 Mar 2013 21:04:24 GMT

New Post: How to bind against a event that are not supported?

mglukhankov — Wed, 27 Mar 2013 15:17:16 GMT

Thanks. I've added DragItemsStarting too.

New Post: How to bind against a event that are not supported?

mglukhankov — Wed, 27 Mar 2013 15:17:16 GMT

Thanks. I've added DragItemsStarting too.

Created Release: v1.0.0.7 (Mar 27, 2013)

mglukhankov — Wed, 27 Mar 2013 15:15:29 GMT

Added EventBinding.DragItemsStarting property.