文本框转换发送键:Alt + Enter ->进入 [英] Textbox convert sent key : Alt + Enter -> Enter

问题描述

我希望能够在不需要实现新类的情况下修改 wpf 文本框的行为.

I'd like to be able to modify the behaviour of the wpf textbox without the need of implementing a new class.

我想要一个类似 enter/Alt+Enter 的 Excel 行为，当用户点击Enter"时，文本框被验证(movefocus ...)，但是当他点击ALT+Enter"时，文本框必须添加一个新的行(我的文本框支持多行:AcceptsReturn 为 true).

I want an Excel like enter / Alt+Enter behavior, when the user hits "Enter" the textbox is validated (movefocus ...), but when he hits "ALT+Enter", the textbox has to add a new line (my textbox supports multiline : AcceptsReturn is true).

我尝试过(在文本框 PreviewKeyDown 事件中):- 按照此链接提出构建 KeyEventArgs 和 TextCompositionEventArgs :How我可以在 C# 中以编程方式生成按键事件吗?- 我试过 SendKeys.SendWait("{ENTER}") 但它发送了许多新的行命令

I've tried (in the textbox PreviewKeyDown event): - Raising to construct a KeyEventArgs and a TextCompositionEventArgs following this link : How can I programmatically generate keypress events in C#? - I've tried SendKeys.SendWait("{ENTER}") but it sends many new line commands

有没有办法做到这一点?

Is there a way to do this ?

谢谢

    private void m_MeasurementName_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        var tb = (sender as TextBox);

        if (Keyboard.Modifiers == ModifierKeys.Alt && Keyboard.IsKeyDown(Key.Enter))
        {
            // 1st try
            var key = "\n\r";
            var routedEvent = Keyboard.KeyDownEvent;
            tb.RaiseEvent(new TextCompositionEventArgs(InputManager.Current.PrimaryKeyboardDevice, new TextComposition(InputManager.Current, tb, key)) { RoutedEvent = routedEvent });

            // 2nd
            var key = Key.Enter;
            var routedEvent = TextCompositionManager.TextInputEvent;
            tb.RaiseEvent(new KeyEventArgs(Keyboard.PrimaryDevice, PresentationSource.FromVisual(tb), 0, key) { RoutedEvent = routedEvent });

            // 3rd
            System.Windows.Forms.SendKeys.SendWait("{ENTER}");

            // 4th Strangely works but not ... you know
            MessageBox.Show("ALT+ENTER");

            e.Handled = true;
        }
        else if (Keyboard.IsKeyDown(Key.Enter))
        {
            tb.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
            e.Handled = true;
        }
    }

推荐答案

如果用户按下 Alt+Enter，只需在现有的 TextBox.Text 上添加一个新行.如果他们只是按 Enter，则在文本绑定上触发 UpdateSource

If the user presses Alt+Enter, simply add a new line onto the existing TextBox.Text. If they hit just Enter, trigger an UpdateSource on the Text Binding

private void m_MeasurementName_PreviewKeyDown(object sender, KeyEventArgs e)
{
    var tb = (sender as TextBox);

    if (Keyboard.Modifiers == ModifierKeys.Alt && Keyboard.IsKeyDown(Key.Enter))
    {
        tb.Text += "\r\n";
        tb.SelectionStart = tb.Text.Length;

        e.Handled = true;
    }
    else if (Keyboard.IsKeyDown(Key.Enter))
    {
        var textBinding = BindingOperations.GetBindingExpression(
            tb, TextBox.TextProperty);

        if (textBinding != null)
            textBinding.UpdateSource();

        e.Handled = true;
    }
}

要使 NewLine 正常工作，请确保 TextBox

For the NewLine to work, make sure AcceptsReturn="True" on your TextBox

这篇关于文本框转换发送键:Alt + Enter ->进入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！