How to binding 2 event in view layer to command so that handle 2 event in viewmodel layer for a button in WPF?

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Hi all,
I'm meeting a problem when using command in MVVM model.
In my App, I have a button and I mst raise 2 event PreviewMouseLeftButtonDown and PreviewMouseLeftButtonUp for this button.
And I want to hook 2 above event into 2 command MouseLeftDownCommand and MouseLeftUpCommand in viewmodel class to handle.

So the question is: How to hook 2 command to 2 event of the same control ?

Please help me to resolve this problem.
Thanks and regards,

Posted 5-Nov-12 21:42pm

tuandung2006

Updated 6-Nov-12 14:24pm

v4

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Jim Jos 6-Nov-12 4:14am

What is the code you have written? Could you put your code? I am not sure what exactly your problem is.. YOu need to use both down and up events? Are you trying to a drag and drop? Otherwise one event is more than necessary

tuandung2006 6-Nov-12 5:00am

Thanks for your reply.
1. The code I have written is WPF.
2. In view class, I have a button, and when MouseDown event raise on this button, it will be binding to a "MouseDown" command(method) that is handle in viewmodel class. And when MouseUp event raise on this button, it will be binding to a "MouseUp"(method) command.
3. Are you trying to a drag and drop?: I just want to catch MouseDown and MouseUp event from view class and handle it inside viewmodel class.
4. Maybe we'll just need a command to handle all event, but at that time we must pass
argument to know which event is raised.

Jim Jos 6-Nov-12 7:11am

OK.. You could have a single command handling both the events are you doing two differnt things in the mouse down and mouse up commands?

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Programm3r · Answer 1 · 2012-11-19T21:51:00

Hi,

Within you viewmodel you'll have two commands:

C#

public ICommand MouseLeftDownCommand {get;set;}
public ICommand MouseLeftUpCommand {get;set;}

Obviously, you'll need to instantiate them and hook them up to some delegate command

Then, within you view (XAML page) you can do something like this:

XML

<button>
  <button.inputbindings>
    <mousebinding gesture="LeftDownClick" command="{Binding MouseLeftDownCommand }" />
    <mousebinding gesture="LeftUpClick" command="{Binding MouseLeftUpCommand }" />
</button.inputbindings>
</button>

Kind regards,