[英]WPF: Textbox + Slider with min values
I have a textbox binded to a slider, and the slider has minimum value set. 我有一个绑定到滑块的文本框,并且滑块设置了最小值。
The problem is that if I start entering the values in the textbox that are out of the min - they are automatically transferred to the min. 问题是,如果我开始在文本框中输入超出最小值的值,则这些值会自动传输到最小值。 eg if I set the min to 4, and I want to type 12, once I press 1, it's already changed to 4 in the textbox, and I can't enter 12, instead it will be 42. If I start typing something with 4 or 5 (say 42, or 51, etc.) it will be ok.
例如,如果我将最小值设置为4,并且我想输入12,则一旦按1,它已经在文本框中更改为4,而我不能输入12,而是42。如果我开始输入4或5(例如42或51等)就可以了。
Is there a way to defer this check of min until after the user has pressed enter ? 有没有办法推迟对min的检查,直到用户按下enter键?
Here's the XAML: 这是XAML:
<TextBox Text="{Binding ElementName=maxValue, Path=Value, UpdateSourceTrigger=PropertyChanged}" TextAlignment="Center" VerticalContentAlignment="Center" Width="30" Height="25" BorderBrush="Transparent"></TextBox>
<Slider Value="{Binding TotalSize}" Maximum="{Binding MaxMaxBackupSize}" Minimum="{Binding MinBackupSize}" TickPlacement="BottomRight" TickFrequency="2" IsSnapToTickEnabled="True" Name="maxValue"></Slider>
Set the UpdateSourceTrigger
property to LostFocus
and press TAB : 将
UpdateSourceTrigger
属性设置为LostFocus
并按TAB :
<TextBox Text="{Binding ElementName=maxValue, Path=Value, UpdateSourceTrigger=LostFocus}" TextAlignment="Center" VerticalContentAlignment="Center" Width="30" Height="25" BorderBrush="Transparent"></TextBox>
Or press ENTER and handle the PreviewKeyDown
event like this: 或按ENTER键并按如下方式处理
PreviewKeyDown
事件:
private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
e.Handled = true;
TextBox textBox = sender as TextBox;
textBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
}
Or you could just explicitly update the source property as suggested by @Clemens: 或者,您可以按照@Clemens的建议显式更新source属性:
private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
e.Handled = true;
TextBox textBox = sender as TextBox;
BindingExpression be = textBox.GetBindingExpression(TextBox.TextProperty);
be.UpdateSource();
}
}
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