具有隐藏可见性的TextBlock不会保留空间

Question

我正在研究一个打卡时钟应用程序，作为学习C＃，XAML和数据库的一种方式。现在，我的GUI并没有按照我的意愿行事。

我的每个按钮都有一个TextBlock，就像Start Shift后显示的那样。

但是，当日期无效时，隐藏TextBlocks。我已经能够显示和隐藏这些我想要的可见性。但是，当我跳过开始午餐和结束午餐并直接进入结束班次时，结束班次TextBlock出现在开始午餐按钮之后，好像开始午餐和结束午餐TextBlocks不同存在。

我在网上看过，发现可见性特征在隐藏时保留了空间，在折叠时没有预留空间，但是我使用的是隐藏的，它仍然没有保留空间。我的代码如下所示。

HomeView.xaml

        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="auto"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>

            <!--Left column buttons-->
            <StackPanel Grid.Column="0" Margin="10">
                <Button Width="140" Content="Start Shift" Command="{Binding startShiftCommand}"
                        IsEnabled="{Binding startShiftActive}"/>
                <Button Width="140" Content="Start Lunch" Command="{Binding startLunchCommand}"
                        IsEnabled="{Binding startLunchActive}"/>
                <Button Width="140" Content="End Lunch"   Command="{Binding endLunchCommand}"
                        IsEnabled="{Binding endLunchActive}"/>
                <Button Width="140" Content="End Shift"   Command="{Binding endShiftCommand}"
                        IsEnabled="{Binding endShiftActive}"/>
                <Button Width="140" Content="Add Break"   Command="{Binding addBreakCommand}"
                        IsEnabled="{Binding addBreakActive}"/>
            </StackPanel>

            <!--Right column text blocks-->
            <StackPanel Grid.Column="1" Margin="10">
                <TextBlock Text="{Binding day.timeIn,     StringFormat=t, UpdateSourceTrigger=PropertyChanged, FallbackValue=StartTime}" FontSize="20"
                           Visibility="{Binding timeInValid,     Converter={StaticResource BoolToVisConverter}}"
                           Padding="5" Margin="10"/>
                <TextBlock Text="{Binding day.lunchStart, StringFormat=t, UpdateSourceTrigger=PropertyChanged, FallbackValue=LunchStart}" FontSize="20"
                           Visibility="{Binding lunchStartValid, Converter={StaticResource BoolToVisConverter}}"
                           Padding="5" Margin="10"/>
                <TextBlock Text="{Binding day.lunchEnd,   StringFormat=t, UpdateSourceTrigger=PropertyChanged}" FontSize="20"
                           Visibility="{Binding lunchEndValid,   Converter={StaticResource BoolToVisConverter}, UpdateSourceTrigger=PropertyChanged}"
                           Padding="5" Margin="10"/>
                <TextBlock Text="{Binding day.timeOut,    StringFormat=t, UpdateSourceTrigger=PropertyChanged, FallbackValue=EndTime}" FontSize="20"
                           Visibility="{Binding timeOutValid,    Converter={StaticResource BoolToVisConverter}, UpdateSourceTrigger=PropertyChanged}"
                           Padding="5" Margin="10"/>

            </StackPanel>
        </Grid>

BooleanToVisibilityConverter.cs

public class BooleanToVisiblityConverter : BaseValueConverter<BooleanToVisiblityConverter>
{
    public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (parameter == null)
            return (bool)value ? Visibility.Hidden : Visibility.Visible;
        else
            return (bool)value ? Visibility.Visible : Visibility.Hidden;
    }
}

HomeViewModel.cs

    private void startShift()
    {
        day.date = DateTime.Now;
        dateValid = true;

        day.timeIn = DateTime.Now;
        timeInValid = true;

        day.breaks = new ObservableCollection<Break>();
        RaisePropertyChanged("day");    //A simple fix to update the UI

        process(Command.startShift);

        infoText = string.Format("Shift started at {0:t}", day.timeIn);

        writeToFile();
    }

    private void startLunch()
    {
        day.lunchStart = DateTime.Now;
        lunchStartValid = true;
        RaisePropertyChanged("day");

        process(Command.startLunch);

        infoText = string.Format("Lunch started at {0:t}", day.lunchStart);

        writeToFile();
    }

    private void endLunch()
    {
        day.lunchEnd= DateTime.Now;
        lunchEndValid = true;
        RaisePropertyChanged("day");

        process(Command.endLunch);

        infoText = string.Format("Lunch ended at {0:t}", day.lunchEnd);

        writeToFile();
    }

    private void endShift()
    {
        day.timeOut = DateTime.Now;
        timeOutValid = true;
        RaisePropertyChanged("day");

        calcTotalTime();

        process(Command.endShift);

        infoText = string.Format("Shift ended at {0:t}\nTotal time for {1:d} is {2}", day.timeOut, day.date, day.totalTime);

        //Save to database
        WorkHoursDBContext context = new WorkHoursDBContext();
        context.Days.Add(day);
        context.SaveChanges();

        writeToFile();
    }

方法process()负责更改每个按钮的boolean以决定是否启用。

当开始午餐和结束午餐TextBlock被隐藏时，有什么方法可以阻止我的结束转换TextBlocks向上滑动？