Hide picture using the keyboard in WPF

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The program below has two buttons that they show and hide 2 pictures by clicking on them successively...
What i want is to set a particular button on the keyboard, say the A button, and by pressing it to hide both picturs

Can you give me an example of such keyboard command in WPF?

Thanks

What I have tried:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        { if (linevertical.Visibility == Visibility.Hidden)
            { linevertical.Visibility = Visibility.Visible; }
            else { linevertical.Visibility = Visibility.Hidden; }
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        { if (lineo.Visibility == Visibility.Hidden)
            { lineo.Visibility = Visibility.Visible; }
            else { lineo.Visibility = Visibility.Hidden; }
        }
    }
}

Posted 10-Apr-19 3:34am

tool__

Updated 10-Apr-19 5:50am

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2 solutions

Solution 2

I found out this which works:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        { if (linevertical.Visibility == Visibility.Hidden)
            { linevertical.Visibility = Visibility.Visible; }
            else { linevertical.Visibility = Visibility.Hidden; }
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        { if (lineo.Visibility == Visibility.Hidden)
            { lineo.Visibility = Visibility.Visible; }
            else { lineo.Visibility = Visibility.Hidden; }
        }

        private void Mainwindow_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.F5)
            {
                lineo.Visibility = Visibility.Hidden;
                linevertical.Visibility = Visibility.Hidden;
            }
        }
    }
}

But only works for F keys , i can't use simple letters, it gives me errors, any ideas guys? i want to use the ''A'' letter in place of the F5...

Posted 10-Apr-19 5:50am

tool__

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CHill60 · Accepted Answer · 2019-04-10T04:12:00

Sounds like you want KeyBinding (aka Hotkey, aka keyboard shortcut)
Have a look at the solutions to this CP post How to Create Short Cut Keys in WPF MVVM pattern[^]
Reference Documentation here [^]
Basically bind a KeyGesture to the button click in your XAML. I would probably combine those two methods into one though

C#

private void Button_Click(object sender, RoutedEventArgs e)
{ 
        HideMyObject(linevertical);
        HideMyObject(lineo);

}
private void HideMyObject(object myObject)
{
        if (myObject.Visibility == Visibility.Hidden)
        { 
                myObject.Visibility = Visibility.Visible; 
        }
        else 
        { 
                myObject.Visibility = Visibility.Hidden; 
        }
}

Edit - OP does not want to use binding. Try this instead

C#

private void Window_KeyDown(object sender, KeyEventArgs e)
{
        if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.A)
        {
                HideMyObject(linevertical);
                HideMyObject(lineo);
        }
}

Note this would do the hiding if Ctrl+A is used. It's a bad idea to just the A-key unless there is absolutely never going to be any keyboard input to the window.