Detect Multiple key pressed in Winrt/Metro app using c#.

Question

Hi All,

I am store app/WinRT developer. My question is how to detect multiple key press in WinRT/Merto app using c#.

I have tried different messenger applications for Store app/Metro app now, and it seems that there are consensus that

a "Plain Enter" will send the message
a "Shift+Enter" will create a newline
a "CTRL+Enter" does nothing
a "ALT+Enter" does nothing

We should conform to this consensus.

That means. Enter should send the text and Shift+Enter should create a newline.

How can I do this in Metro app using c#. I am also follow the native message app,their all the functionality are apply which I enclose above so I belief that it is possible.But how can I do this it is very importent for me.Please reply as early as possible.

ThanQ

Ganesh

Answer 1

Hi Ganesh,

you  just have to listen for the onkeyDown Event

For example:
following code was from this thread

private void onKeyDown(object sender, KeyRoutedEventArgs e)
{
    if (e.Key == VirtualKey.Control) m_ControlPressed = true;
    else if (m_ControlPressed && e.Key == VirtualKey.V)
    {
        // do some stuff
    }
}

Also see here: http://stackoverflow.com/questions/1265634/keydown-recognizing-multiple-keys

And here: http://msdn.microsoft.com/en-us/library/windows/apps/hh868246.aspx

Andy

Answer 2

Hi SW_Andy,
ThanQ for your valuable reply.I am solve it by using this code bellow

var enter = Window.Current.CoreWindow.GetKeyState(VirtualKey.Enter);
                var shift = Window.Current.CoreWindow.GetKeyState(VirtualKey.Shift);
                if (enter.HasFlag(Windows.UI.Core.CoreVirtualKeyStates.Down) && shift.HasFlag(Windows.UI.Core.CoreVirtualKeyStates.Down))
                {
                                    
                }
                else if (enter.HasFlag(Windows.UI.Core.CoreVirtualKeyStates.Down))            
            
                {                 

                }

But I am suffering another problem when we press shift+Enter we get a new line like native message in windows8.How can I do this?

ThanQ

Ganesh

Answer 3

Hi All,

At last  I am solving it code given bellow.

                 if (e.Handled)
                    return;
                var enter = Window.Current.CoreWindow.GetKeyState(VirtualKey.Enter);
                var shift = Window.Current.CoreWindow.GetKeyState(VirtualKey.Shift);
                if (enter.HasFlag(Windows.UI.Core.CoreVirtualKeyStates.Down) && shift.HasFlag(Windows.UI.Core.CoreVirtualKeyStates.Down))
                {                   
                    txtMessage.Text += "\r\n";
                    txtMessage.SelectionStart = txtMessage.Text.Length;
                    e.Handled = true;
                
                }
                else if (enter.HasFlag(Windows.UI.Core.CoreVirtualKeyStates.Down))             
                {                
                
                    e.Handled = true;                   
                }
            }
           

ThanQ

Ganesh

Answer 4

Thanks Ganesh :) Your solution is the only one that worked for me.