How to change the keyboard function?

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Hi. I Have One Tree View, One Media Element and one Custom Menu Tabs In My WPF Program.
I want My Keyboard have Different Function in Each of them. For Example Up and Down key in Tree view Should Move Between the Item and In The Media Element Should Control the Volume. In Other World I want When the user click on each tab the keyboard Function change?
I use this Code right Know But I cannot control Program with this Correctly. for example if I press Down key the program first change the treeview Item, Then change the valume.

What I have tried:

private void Window_KeyDown(object sender, KeyEventArgs e)
       {
           switch (e.Key)
           {
               case Key.Space: PlayPause(); break;
               case Key.Enter: FullScreenFunction(); break;
               case Key.Up: VolumeBar.Value = VolumeBar.Value + 0.01; break;
               case Key.Down: VolumeBar.Value = VolumeBar.Value - 0.01; break;
               case Key.Right: mediaPlayer.Position = TimeSpan.FromSeconds(VideoPosBar.Value + 5); break;
               case Key.Left: mediaPlayer.Position = TimeSpan.FromSeconds(VideoPosBar.Value - 5); break;
               case Key.M: MuteSoundfunction(); break;
           }
       }

Posted 11-Oct-20 20:08pm

link1234

Updated 11-Oct-20 22:37pm

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Richard MacCutchan · Answer 1 · 2020-10-11T22:37:00

Solution 1

You need to check some other item for each key to see which function to perform. As it stands your cases each perform the same function always. You need something like:

C#

private void Window_KeyDown(object sender, KeyEventArgs e)
{
    if (inTreeView) // set this value somewhere to know which cases to use
    {
        switch (e.Key)
        {
        // cases for moving between tree items
        }
    }
    else
    {
        switch (e.Key)
        {
        // cases for volume controls
        }
    }
}

Posted 11-Oct-20 22:37pm

Richard MacCutchan

Comments

link1234 12-Oct-20 8:21am

Thank you. But What should I Write in the if Body to check if the user click on the treeview or media element?

Richard MacCutchan 12-Oct-20 8:33am

I have no idea. It is your application so you know what the user is trying to do at any point.

link1234 12-Oct-20 9:51am

for now when I choose the item in treeview and then click on the play button with mouse the control pass to the play button and the arrow key work correctly for change volume. But when I Click space for run Video, video is run but the control remain in treeview, so the arrow key not worked correctly. how can pass the control from the treeview to the button or window after click space or enter?

Richard MacCutchan 12-Oct-20 9:54am

As I said above, I have no idea. I do not know anything about how your application works, or is supposed to work. You need to track the focus of your application to know which control is supposed to handle a keypress at any time.

link1234 12-Oct-20 10:34am

Now i Find My answer with the search of Focus word. thank you.

link1234 12-Oct-20 10:35am

big part of my problem solved right now. I can change the focus from treeview to each element I want, But when I pass to the window is not working.