wpf - 更改缩放顺序 WPF

Question

我有一个需要响应的 WPF 应用程序。我想要的是DataGrid里面Grid .当窗口缩小时，我想要 Grid先调整大小，然后是 DataGrid .这是我迄今为止取得的成就:



在顶部的 gif 中，您可以看到 Grid首先调整大小，当它达到最小缩放大小时，它会越过底部 DataGrid .不完全是我想要的，因为我想先缩放布局，然后在 DataGrid 中显示滚动条而不是布局只是过去。所以我尝试了以下方法:



在这里你可以看到它显示了我想要的滚动条。唯一的事情是它首先调整 DataGrid 的大小，当它完成调整 DataGrid 的大小时，它开始调整 Grid 的大小。我希望它是相反的，首先调整网格的大小，然后调整 DataGrid 的大小并显示滚动条。所以基本上我正在寻找执行以下操作的解决方案:

缩放缩放网格的窗口。

缩放网格直到它的最小尺寸

当它达到最小尺寸并且仍然越来越小时，在 DataGrid 中显示滚动条。

所以这归结为这个问题的第一个 Gif，然后是 DataGrid 中的滚动条

有没有办法做到这一点？看起来我很接近，因为它是这两件事的结合，但我不知道如何。这是我的代码:

<Grid Grid.Row="1" HorizontalAlignment="Right"  Grid.Column="0">
  <Grid ShowGridLines="False">
    <Grid.RowDefinitions>
      <RowDefinition MaxHeight="50"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="20"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="5"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="5"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="5"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="50"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="50"/>
      <RowDefinition Height="auto"/>
      <RowDefinition MaxHeight="5"/>
      <RowDefinition Name="DataGridRow" Height="*" MaxHeight="240" />
    </Grid.RowDefinitions>

    <Label Grid.Row="1" FontSize="24">Test</Label>
    <Label Grid.Row="3" Content="Test"/>
    <ComboBox Grid.Row="5" MaxWidth="500" MinWidth="300" HorizontalAlignment="Left"  />
    <Label Grid.Row="7" Content="Test"/>
    <ComboBox Grid.Row="9" MaxWidth="500" MinWidth="300" HorizontalAlignment="Left"/>
    <Separator Grid.Row="11"/>

    <Label Grid.Row="13" Content="Test" />
    <Grid Grid.Row="15">
      <DataGrid
          RowHeight="40"
           CanUserAddRows="False"
            x:Name="dataGrid"
            AutoGenerateColumns="False"
            CanUserResizeColumns="True"
            HeadersVisibility="None"
            GridLinesVisibility="None"
            ScrollViewer.CanContentScroll="True"
            ScrollViewer.VerticalScrollBarVisibility="Visible"
            ScrollViewer.HorizontalScrollBarVisibility="Auto"
        <DataGrid.Columns>
          <DataGridTextColumn IsReadOnly="True" Width="*" Binding="{Binding Name}">
            <DataGridTextColumn.ElementStyle>
              <Style TargetType="TextBlock">
                <Setter Property="VerticalAlignment" Value="Center" />
                <Setter Property="Margin" Value="2,0,0,0"/>
              </Style>
            </DataGridTextColumn.ElementStyle>
          </DataGridTextColumn>
        </DataGrid.Columns>
      </DataGrid>
    </Grid>
  </Grid>
</Grid>

Answer 1

在无法使用默认构建块求解布局方程的情况下，您可以
自己做计算。让转换器计算剩余的可用空间。

剩下的问题是双重的:

DataGrid可能只有在星形大小的行有时才会收缩ActualHeight 0.

解决方案:DataGrid.Style那套dataGrid.MaxHeight当triggerGrid.ActualHeight = 0 ( triggerGrid 占据一颗星大小
行)。

当我们给出 MinHeight至 DataGridRow它不会缩小时dataGrid.ActualHeight收缩(它窃取了收缩的高度
回)。

解决方案:RowDefinition.Style设置其 MinHeight到dataGrid.ActualHeight当triggerGrid.ActualHeight = 0 并且到
否则为固定值。

我已经设置了控件的 BackGround颜色来说明当星星大小的高度(剩余的空白区域)变为 0 时。

<Window 

    ...

    Width="200" Height="450">
    <Window.Resources>
        <local:HeightConverter x:Key="HeightConverter" />
        <local:IsEqualToZeroConverter x:Key="IsEqualToZeroConverter" />
    </Window.Resources>
    <!--MainGrid-->
    <Grid x:Name="mainGrid">
        <Grid ShowGridLines="False">
            <Grid.RowDefinitions>
                <RowDefinition MaxHeight="50"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="20"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="5"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="5"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="5"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="50"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="50"/>
                <RowDefinition Height="auto"/>
                <RowDefinition MaxHeight="5"/>
                <RowDefinition x:Name="dataGridRow" Height="Auto">
                    <RowDefinition.Style>
                        <Style TargetType="{x:Type RowDefinition}">
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding ActualHeight, ElementName=triggerGrid, Converter={StaticResource IsEqualToZeroConverter}}" Value="True">
                                    <Setter  Property="MinHeight" Value="{Binding ActualHeight, ElementName=dataGrid}"/>
                                </DataTrigger>
                                <DataTrigger Binding="{Binding ActualHeight, ElementName=triggerGrid, Converter={StaticResource IsEqualToZeroConverter}}" Value="False">
                                    <Setter  Property="MinHeight" Value="80.0"/>
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </RowDefinition.Style>
                </RowDefinition>
            </Grid.RowDefinitions>
            <Label x:Name="bigLabel" Grid.Row="1" FontSize="24" Background="LightGray">Test</Label>
            <Label x:Name="regularLabel" Grid.Row="3" Content="Test" Background="LightGray"/>
            <ComboBox x:Name="comboBox" Grid.Row="5" MaxWidth="500" MinWidth="300" HorizontalAlignment="Left"  Background="LightGray" />
            <Label Grid.Row="7" Content="Test" Background="LightGray"/>
            <ComboBox Grid.Row="9" MaxWidth="500" MinWidth="300" HorizontalAlignment="Left" Background="LightGray"/>
            <Separator x:Name="separator" Grid.Row="11"/>
            <Label Grid.Row="13" Content="Test"  Background="LightGray"/>
            <!--TriggerGrid-->
            <Grid Grid.Row="14" x:Name="triggerGrid"/>
            <Grid Grid.Row="15">
                <DataGrid
                    x:Name="dataGrid"
                    RowHeight="40"
                    CanUserAddRows="False"
                    AutoGenerateColumns="False"
                    CanUserResizeColumns="True"
                    HeadersVisibility="None"
                    GridLinesVisibility="None"
                    ScrollViewer.CanContentScroll="True"
                    ScrollViewer.VerticalScrollBarVisibility="Visible"
                    ScrollViewer.HorizontalScrollBarVisibility="Auto">
                    <DataGrid.Style>
                        <Style TargetType="{x:Type DataGrid}">
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding ActualHeight, ElementName=triggerGrid}" Value="0">
                                    <Setter Property="MaxHeight">
                                        <Setter.Value>
                                            <MultiBinding Converter="{StaticResource HeightConverter}">
                                                <Binding ElementName="mainGrid" Path="ActualHeight"/>
                                                <Binding ElementName="bigLabel" Path="ActualHeight"/>
                                                <Binding ElementName="regularLabel" Path="ActualHeight"/>
                                                <Binding ElementName="comboBox" Path="ActualHeight"/>
                                                <Binding ElementName="separator" Path="ActualHeight"/>
                                            </MultiBinding>
                                        </Setter.Value>
                                    </Setter>
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </DataGrid.Style>
                    <DataGrid.Columns>
                        <DataGridTextColumn IsReadOnly="True" Width="*" Binding="{Binding Name}">
                            <DataGridTextColumn.ElementStyle>
                                <Style TargetType="TextBlock">
                                    <Setter Property="VerticalAlignment" Value="Center" />
                                    <Setter Property="Margin" Value="2,0,0,0"/>
                                </Style>
                            </DataGridTextColumn.ElementStyle>
                        </DataGridTextColumn>
                    </DataGrid.Columns>
                </DataGrid>
            </Grid>
        </Grid>
    </Grid>
</Window>

转换器

public class HeightConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        // only 1 check at startup (Debugging)
        if ((double)values[1] == 0.0) return 0.0;

        double mainGridHeight       = (double)values[0];
        double bigLabelHeight       = (double)values[1];
        double regularLabelHeight   = (double)values[2];
        double comboBoxHeight       = (double)values[3];
        double separatorHeight      = (double)values[4];

        double dataGridHeight = mainGridHeight - bigLabelHeight - 2 * (regularLabelHeight + comboBoxHeight) - regularLabelHeight - separatorHeight;

        if (dataGridHeight > 0.0) return dataGridHeight; else return 0.0;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

public class IsEqualToZeroConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return ((double)value == 0.0);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}