Creating a Keyboard Chord Which Overrides a Default Action (CTRL-V)-CodePudding

My goal is to replicate the keyboard chord combination from Visual Studio editor Ctrl E V which duplicates the line. To be clear, this is not a question on how to duplicate a line, but to handle a keyboard chord scenario in WPF.

How can a chord be accomplished where

The CtrlV standalone won't fire the custom line duplication command and just not be handled when E has not accompanied it.
- AKA fall back to the system to do a Paste.
- This is not a deal breaker and I can process the clipboard if so.

I've tried

<KeyBinding Gesture="Ctrl E" Command="{Binding cmdSetChord_E}"/>
<KeyBinding Gesture="Ctrl V" Command="{Binding cmdDuplicateCurrent}"/>

and

bool ePressed;

private void tbPatternDesign_KeyDown(object sender, KeyEventArgs e)
{
    if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.E)
        ePressed = e.Handled = true;

    if (ePressed && Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.V)
    {
        MessageBox.Show("Duplicate");
        e.Handled = true;
        ePressed = false;
    }
}

to no avail.

CodePudding user response：

You can use CommandBinding to override a control's default command implementation. This is a sample with a TextBox.

<TextBox>
    <TextBox.CommandBindings>
        <CommandBinding Command="ApplicationCommands.Paste" Executed="CommandBinding_Executed"/>
        <CommandBinding Command="EditingCommands.AlignCenter" Executed="CommandBinding_Executed"/>
    </TextBox.CommandBindings>
    <TextBox.InputBindings>
        <KeyBinding Command="EditingCommands.AlignCenter" Gesture="CTRL E"/>
    </TextBox.InputBindings>
</TextBox>

    bool ePressed;

    private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        switch (((RoutedUICommand)e.Command).Text)
        {
            case "Paste":
                if (ePressed)
                {
                    MessageBox.Show("Duplicate");
                    ePressed = false; 
                }
                else
                    ((TextBox)sender).Paste();
                break;
            case "AlignCenter":
                ePressed = true;
                break;
        }
    }

CodePudding user response：

How about:

Keyboard.IsKeyDown(Key.E) && Keyboard.IsKeyDown(Key.V) && ...

CodePudding user response：

Try using

Console.readkey()

It might not be the most intuitive way of doing it, but it is a good for-now solution.