WPF TextBox选择Tab焦点上的所有内容

Question

I'm trying to select all the text when the focus is done with the Tab key . But I'm not able to find the right solution. Now I'm using the GotFocusEvent but now when i click with the mouse it raises the event.

The code that I'm using now is:

EventManager.RegisterClassHandler(typeof(System.Windows.Controls.TextBox), System.Windows.Controls.TextBox.GotKeyboardFocusEvent, new RoutedEventHandler(SelectAllText));


void SelectAllText(object sender, RoutedEventArgs e)
{
    var textBox = sender as System.Windows.Controls.TextBox;
    if (textBox != null)
        if (!textBox.IsReadOnly)
            textBox.SelectAll();
}

Answer 1

Referencing this answer

Textbox SelectAll on tab but not mouse click

What you have can be modified to...

EventManager.RegisterClassHandler(typeof(System.Windows.Controls.TextBox), System.Windows.Controls.TextBox.GotKeyboardFocusEvent, new KeyboardFocusChangedEventHandler(OnGotKeyboardFocus));

void OnGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
    var textBox = sender as System.Windows.Controls.TextBox;

    if (textBox != null && !textBox.IsReadOnly && e.KeyboardDevice.IsKeyDown(Key.Tab))
        textBox.SelectAll();
}

You should also take notice of the details about clearing the selection on LostKeyboardFocus

Answer 2

Use MouseButtonState as below:

 void SelectAllText(object sender, RoutedEventArgs e)
    {
        if (Mouse.LeftButton == MouseButtonState.Released)
        {
            var textBox = sender as System.Windows.Controls.TextBox;
            if (textBox != null)
                if (!textBox.IsReadOnly)
                    textBox.SelectAll();
        }
    }