c# - 在扩展器关闭时缩小窗口大小

Question

大家好，我有 3 个列扩展器，当您将它们全部打开并调整窗口大小时，它们会适当拉伸(stretch)以适合窗口。当您关闭扩展器时，我希望它在打开时将窗口缩小该扩展器的宽度。它目前将扩展器关闭回 20 像素，但打开的扩展器会更大(它会拉伸(stretch)以填充空白空间)。

代码:

<UserControls:ExpanderWindow x:Class="Lainezor.Windows.ExpanderWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:xt="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit.Extended"
    xmlns:pg="clr-namespace:Microsoft.Windows.Controls.PropertyGrid;assembly=WPFToolkit.Extended"
    xmlns:MyUserControls="clr-namespace:Lainezor.UserControls.ExpanderControls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    SizeToContent="WidthAndHeight" Background="AliceBlue" 
    ResizeMode="CanResize" WindowStartupLocation="Manual" Loaded="Window_Loaded">
<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition>
            <ColumnDefinition.Style>
                <Style TargetType="ColumnDefinition">
                    <Setter Property="Width" Value="20" />
                    <Setter Property="MinWidth" Value="20" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding IsExpanded, ElementName=Expander1}" Value="True">
                            <Setter Property="Width" Value="20*" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ColumnDefinition.Style>
        </ColumnDefinition>
        <ColumnDefinition Width="2"/>
        <ColumnDefinition>
            <ColumnDefinition.Style>
                <Style TargetType="ColumnDefinition">
                    <Setter Property="Width" Value="20" />
                    <Setter Property="MinWidth" Value="20" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding IsExpanded, ElementName=Expander2}" Value="True">
                            <Setter Property="Width" Value="20*" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ColumnDefinition.Style>
        </ColumnDefinition>
        <ColumnDefinition Width="2"/>
        <ColumnDefinition>
            <ColumnDefinition.Style>
                <Style TargetType="ColumnDefinition">
                    <Setter Property="Width" Value="20" />
                    <Setter Property="MinWidth" Value="20" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding IsExpanded, ElementName=Expander3}" Value="True">
                            <Setter Property="Width" Value="20*" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ColumnDefinition.Style>
        </ColumnDefinition>
    </Grid.ColumnDefinitions> 
    <Grid.RowDefinitions>
        <RowDefinition Height="1*"/>
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Expander Name="Expander1" Grid.Column="0" IsExpanded="True" IsEnabled="True" ExpandDirection="Right">
        <Expander.Header>
            <TextBlock Text="{Binding Source={StaticResource ResourceWrapper}, Path=MyStrings.Expander1Label}"  RenderTransformOrigin="0,0" >
                <TextBlock.LayoutTransform>
                        <RotateTransform Angle="90"/>
                </TextBlock.LayoutTransform>
            </TextBlock>
        </Expander.Header>
        <MyUserControls:UserControl1 x:Name="UserControl1" SizeChanged="UserControl1_SizeChanged"/>
    </Expander>
    <GridSplitter x:Name="gridSplitter" Grid.Column="1" Width="2" Background="#CBE5FE" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext" VerticalAlignment="Stretch" />
    <Expander Grid.Column="2" Grid.RowSpan="2" Name="Expander2" ExpandDirection="Right" Grid.IsSharedSizeScope="True">
        <Expander.Header >
            <TextBlock Text="{Binding Source={StaticResource ResourceWrapper}, Path=MyStrings.Expander2Label}">
                <TextBlock.LayoutTransform>
                        <RotateTransform Angle="90" />              
                </TextBlock.LayoutTransform>
            </TextBlock>
        </Expander.Header>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <MyUserControls:UserControl2 x:Name="UserControl2" HorizontalAlignment="Stretch"/>
        </Grid>
    </Expander>
    <GridSplitter x:Name="gridSplitterTwo" Grid.Column="3" Width="2" Background="#CBE5FE" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"  VerticalAlignment="Stretch" />
    <Expander Grid.Column="4" Grid.RowSpan="2" Name="Expander3" ExpandDirection="Right">
        <Expander.Header >
            <TextBlock Text="Lainezor">
                <TextBlock.LayoutTransform>
                        <RotateTransform Angle="90" />              
                </TextBlock.LayoutTransform>
            </TextBlock>
        </Expander.Header>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <MyUserControls:UserControl3 x:Name="UserControl3" HorizontalAlignment="Stretch" />
        </Grid>
    </Expander>
</Grid>

Answer 1

将窗口的 SizeToContent 设置为 "WidthAndHeight" 并且不要设置它的 Width 或 Height 或designWidth 或 designHeight。