在我的WPF应用程序中,我使用Caliburn.Micro在View和ViewModel之间进行绑定。
在我的视图中,我有StackPanel文本框
<StackPanel>
<TextBox x:Name="Ctx_A" />
<TextBox x:Name="Ctx_B" />
<TextBox x:Name="Ctx_C" />
<TextBox x:Name="Ctx_D" />
</StackPanel>
现在我想在关注TextBox之后选择所有文本。在我的ViewModel中,我编写方法TextBox GotFocus
public void TextBoxGotFocus(object sender)
{
var tb = sender as TextBox;
if (tb != null)
{
tb.SelectAll();
}
}
接下来我回到我的视图并写下这样的东西:
<StackPanel>
<TextBox x:Name="Ctx_A" cal:Message.Attach=" [Event GotFocus]=[Action TextBoxGotFocus($source)]"/>
<TextBox x:Name="Ctx_B" cal:Message.Attach=" [Event GotFocus]=[Action TextBoxGotFocus($source)]"/>
<TextBox x:Name="Ctx_C" cal:Message.Attach=" [Event GotFocus]=[Action TextBoxGotFocus($source)]"/>
<TextBox x:Name="Ctx_D" cal:Message.Attach=" [Event GotFocus]=[Action TextBoxGotFocus($source)]"/>
</StackPanel>
有没有可能将此方法附加到StackPanel而不是TextBox?
我会从您的视图模型中删除TextBoxGotFocus()
方法,因为它会模糊视图和视图模型之间的线条。视图模型不应使用其中的任何WPF控件。相反,我能想到的最简单的方法是创建一个继承自TextBox
的类,然后将事件附加到该类:
public class AutofocusTextBox : TextBox
{
public AutofocusTextBox()
{
GotFocus += (sender, e) => SelectAll();
}
}
然后在你的XAML中,你可以像这样使用它:
<local:AutofocusTextBox ... />
这将使您的XAML更加清洁
所有信用都归WPF博士... Source
在abcView.xaml中
<TextBox Text="{Binding Amount}"
MinWidth="100"
cal:Message.Attach="[Event GotFocus] = [Action GotFocusMethod($source)];
[Event PreviewMouseLeftButtonDown] = [Action SelectivelyIgnoreMouseButton($source, $eventArgs)]" />
在abcViewModel.cs中
// called by ui... used to highlight a textbox on focus
public void GotFocusMethod(object source)
{
var based = source as TextBox;
based.SelectAll();
} // close gotfocusmethod
// called by ui... used to highlight a textbox on focus
public void SelectivelyIgnoreMouseButton(object sender, MouseButtonEventArgs eve)
{
TextBox tb = (sender as TextBox);
if (tb != null)
{
if (!tb.IsKeyboardFocusWithin)
{
eve.Handled = true;
tb.Focus();
}
}
} // close selectivelyignoremousebutton()