我希望能够修改wpf文本框的行为,而无需实现新类。
我想要一个像enter / Alt + Enter行为的Excel,当用户点击“Enter”时,文本框被验证(movefocus ...),但当他点击“ALT + Enter”时,文本框必须添加一个新的line(我的文本框支持多行:AcceptsReturn为true)。
我试过(在文本框中的PreviewKeyDown事件): - 通过以下链接提升构建KeyEventArgs和TextCompositionEventArgs:How can I programmatically generate keypress events in C#? - 我尝试过SendKeys.SendWait(“{ENTER}”),但它发送了许多新的行命令
有办法做到这一点吗?
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;
}
}
答案 0 :(得分:7)
如果用户按Alt + Enter,只需在现有TextBox.Text
上添加新行。如果他们只按Enter键,则在文本绑定上触发UpdateSource
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正常运行,请确保AcceptsReturn="True"
TextBox