如何在用户展开/折叠树视图时保持区域恒定/相对大小? [英] How to keep an area a constant/relative size while user expands/collapses treeview?

问题描述

我有一个可变大小的窗口，目前为 300 x 400，如下所示.

I have a window that will be a variable size, currently it is 300 x 400 as shown below.

在顶部部分，我有一个可扩展的树视图在底部部分，我有一个长长的水平面板，里面有一个按钮.

In the top part I have an expandable tree view In the bottom part I have a long horizontal panel with a button in it.

我希望顶部区域(树状视图)大约为高度的 95%，按钮工具区域的高度为 50.

I want the top area (treeview) to be about 95% of the height, with the button tool area a constant 50 high.

我希望这些比例在用户展开和折叠树视图时保持恒定(并且当它在按钮工具栏下方展开时，我希望视图滚动条弹出一个滚动条.

I want these proportions to stay constant as the user expands and collapses the tree view (and as it expands below the button toolbar, I want the viewscroller to pop in with a scrollbar.

我该怎么做?这是迄今为止我能做的最好的事情，但是当用户折叠树视图时按钮区域会向上移动.:

How can I do this? Here's the best I could do so far, but the button area moves up as the user collapses the tree view. :

<Window x:Class="TestSize8383.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="400">
    <Window.Resources>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </Window.Resources>

    <DockPanel Background="Beige" Margin="3" LastChildFill="False">

        <ScrollViewer DockPanel.Dock="Top" Background="White" Margin="3">
            <TreeViewItem DockPanel.Dock="Top" Background="White" Header="Page 1" IsExpanded="True">

                <TreeViewItem Header="Part 1">
                    <TreeViewItem Header="Paragraph 1">
                        <TreeViewItem Header="Word 1"/>
                        <TreeViewItem Header="Word 2"/>
                    </TreeViewItem>
                    <TreeViewItem Header="Paragraph 2">
                        <TreeViewItem Header="Word 1"/>
                        <TreeViewItem Header="Word 2"/>
                    </TreeViewItem>
                    <TreeViewItem Header="Paragraph 3">
                        <TreeViewItem Header="Word 1"/>
                        <TreeViewItem Header="Word 2"/>
                    </TreeViewItem>

                    <TreeViewItem Header="Part 2">
                        <TreeViewItem Header="Paragraph 1">
                            <TreeViewItem Header="Word 1"/>
                            <TreeViewItem Header="Word 2"/>
                        </TreeViewItem>
                        <TreeViewItem Header="Paragraph 2">
                            <TreeViewItem Header="Word 1"/>
                            <TreeViewItem Header="Word 2"/>
                        </TreeViewItem>
                        <TreeViewItem Header="Paragraph 3">
                            <TreeViewItem Header="Word 1"/>
                            <TreeViewItem Header="Word 2"/>
                        </TreeViewItem>
                    </TreeViewItem>


                </TreeViewItem>
            </TreeViewItem>
        </ScrollViewer>

        <StackPanel DockPanel.Dock="Bottom" Background="Tan" Margin="3" Height="50">
            <Button Content="Previous" Margin="5"/>
        </StackPanel>

    </DockPanel>
</Window>

推荐答案

使用 Grid 而不是 DockPanel 怎么样?

How about using a Grid instead of using a DockPanel?

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="50" />
    </Grid.RowDefinitions>

    <ScrollViewer Grid.Row="0">
    ...
    </ScrollViewer>

    <StackPanel Grid.Row="1">
    ...
    </StackPanel>
</Grid>

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