MVVMLight EventToCommand and passing event arguments












0














I have a mousewheel interactivity trigger on a StackPanel:



 <i:Interaction.Triggers>

         <i:EventTrigger EventName="MouseWheel">

               <cmd:EventToCommand Command="{Binding DataContext.PreviousWeekCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"

                                             PassEventArgsToCommand="True"/>

         </i:EventTrigger>

</i:Interaction.Triggers>


and it works great with the PreviousWeekCommand as follows (snippet):



_previousWeekCommand = new RelayCommand<object>(param => ShiftDays(-7), param => (true));


The PassEventArgsToCommand is there because I'm trying to switch this to a different command that will detect if the user has scrolled up or down. The problem is, after a lot of searching, I still can't figure out how to structure the command to deal with the args. Here's what I have, but it doesn't work:



_scrollWheelCommand = new RelayCommand<MouseEventArgs>(ScrollWheel, can => true);


and then this is the ScrollWheel declaration:



public void ScrollWheel(MouseEventArgs args)


Problem is, I never get to this method when I breakpoint it. I also don't know if I'm routing the arguments in the correct way.



EDIT: Oh, and I get no errors.






c# wpf xaml mvvm-light







share|improve this question






















  • What's the difference between _previousWeekCommand and _scrollWheelCommand? Does it stop working when you change the type argument for the _previousWeekCommand?
    – mm8
    Nov 13 '18 at 9:23
















0














I have a mousewheel interactivity trigger on a StackPanel:



 <i:Interaction.Triggers>

         <i:EventTrigger EventName="MouseWheel">

               <cmd:EventToCommand Command="{Binding DataContext.PreviousWeekCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"

                                             PassEventArgsToCommand="True"/>

         </i:EventTrigger>

</i:Interaction.Triggers>


and it works great with the PreviousWeekCommand as follows (snippet):



_previousWeekCommand = new RelayCommand<object>(param => ShiftDays(-7), param => (true));


The PassEventArgsToCommand is there because I'm trying to switch this to a different command that will detect if the user has scrolled up or down. The problem is, after a lot of searching, I still can't figure out how to structure the command to deal with the args. Here's what I have, but it doesn't work:



_scrollWheelCommand = new RelayCommand<MouseEventArgs>(ScrollWheel, can => true);


and then this is the ScrollWheel declaration:



public void ScrollWheel(MouseEventArgs args)


Problem is, I never get to this method when I breakpoint it. I also don't know if I'm routing the arguments in the correct way.



EDIT: Oh, and I get no errors.






c# wpf xaml mvvm-light







share|improve this question






















  • What's the difference between _previousWeekCommand and _scrollWheelCommand? Does it stop working when you change the type argument for the _previousWeekCommand?
    – mm8
    Nov 13 '18 at 9:23














0












0








0







I have a mousewheel interactivity trigger on a StackPanel:



 <i:Interaction.Triggers>

         <i:EventTrigger EventName="MouseWheel">

               <cmd:EventToCommand Command="{Binding DataContext.PreviousWeekCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"

                                             PassEventArgsToCommand="True"/>

         </i:EventTrigger>

</i:Interaction.Triggers>


and it works great with the PreviousWeekCommand as follows (snippet):



_previousWeekCommand = new RelayCommand<object>(param => ShiftDays(-7), param => (true));


The PassEventArgsToCommand is there because I'm trying to switch this to a different command that will detect if the user has scrolled up or down. The problem is, after a lot of searching, I still can't figure out how to structure the command to deal with the args. Here's what I have, but it doesn't work:



_scrollWheelCommand = new RelayCommand<MouseEventArgs>(ScrollWheel, can => true);


and then this is the ScrollWheel declaration:



public void ScrollWheel(MouseEventArgs args)


Problem is, I never get to this method when I breakpoint it. I also don't know if I'm routing the arguments in the correct way.



EDIT: Oh, and I get no errors.






c# wpf xaml mvvm-light







share|improve this question













I have a mousewheel interactivity trigger on a StackPanel:



 <i:Interaction.Triggers>

         <i:EventTrigger EventName="MouseWheel">

               <cmd:EventToCommand Command="{Binding DataContext.PreviousWeekCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"

                                             PassEventArgsToCommand="True"/>

         </i:EventTrigger>

</i:Interaction.Triggers>


and it works great with the PreviousWeekCommand as follows (snippet):



_previousWeekCommand = new RelayCommand<object>(param => ShiftDays(-7), param => (true));


The PassEventArgsToCommand is there because I'm trying to switch this to a different command that will detect if the user has scrolled up or down. The problem is, after a lot of searching, I still can't figure out how to structure the command to deal with the args. Here's what I have, but it doesn't work:



_scrollWheelCommand = new RelayCommand<MouseEventArgs>(ScrollWheel, can => true);


and then this is the ScrollWheel declaration:



public void ScrollWheel(MouseEventArgs args)


Problem is, I never get to this method when I breakpoint it. I also don't know if I'm routing the arguments in the correct way.



EDIT: Oh, and I get no errors.






c# wpf xaml mvvm-light




c# wpf xaml mvvm-light






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 12 '18 at 22:13









linus72982linus72982

7321022




7321022












  • What's the difference between _previousWeekCommand and _scrollWheelCommand? Does it stop working when you change the type argument for the _previousWeekCommand?
    – mm8
    Nov 13 '18 at 9:23


















  • What's the difference between _previousWeekCommand and _scrollWheelCommand? Does it stop working when you change the type argument for the _previousWeekCommand?
    – mm8
    Nov 13 '18 at 9:23
















What's the difference between _previousWeekCommand and _scrollWheelCommand? Does it stop working when you change the type argument for the _previousWeekCommand?
– mm8
Nov 13 '18 at 9:23




What's the difference between _previousWeekCommand and _scrollWheelCommand? Does it stop working when you change the type argument for the _previousWeekCommand?
– mm8
Nov 13 '18 at 9:23












1 Answer
1






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oldest

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1














Try using MouseWheelEventArgs instead of MouseEventArgs when declaring your RelayCommand. The Parameter type should match the event in order for that to work.






share|improve this answer





















  • That did it -- thanks!
    – linus72982
    Nov 13 '18 at 18:02











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Try using MouseWheelEventArgs instead of MouseEventArgs when declaring your RelayCommand. The Parameter type should match the event in order for that to work.






share|improve this answer





















  • That did it -- thanks!
    – linus72982
    Nov 13 '18 at 18:02
















1














Try using MouseWheelEventArgs instead of MouseEventArgs when declaring your RelayCommand. The Parameter type should match the event in order for that to work.






share|improve this answer





















  • That did it -- thanks!
    – linus72982
    Nov 13 '18 at 18:02














1












1








1






Try using MouseWheelEventArgs instead of MouseEventArgs when declaring your RelayCommand. The Parameter type should match the event in order for that to work.






share|improve this answer












Try using MouseWheelEventArgs instead of MouseEventArgs when declaring your RelayCommand. The Parameter type should match the event in order for that to work.







share|improve this answer












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share|improve this answer










answered Nov 13 '18 at 9:07









TomerAgmon1TomerAgmon1

1258




1258












  • That did it -- thanks!
    – linus72982
    Nov 13 '18 at 18:02


















  • That did it -- thanks!
    – linus72982
    Nov 13 '18 at 18:02
















That did it -- thanks!
– linus72982
Nov 13 '18 at 18:02




That did it -- thanks!
– linus72982
Nov 13 '18 at 18:02


















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