WPF GridSplitter - 按比例保存和恢复位置和分割

Question

我正在创建一个3列UI,列之间有网格分割器.我需要保存列的状态,以便在用户关闭并重新打开应用程序时,它看起来就像是他们离开了它.但我也试图让柱子按比例分割 - 我的意思是,如果你拉伸窗口,所有三个面板都会增长,如果你移动左边的分割器,它会改变左边和中间列之间的分割.

我目前只实现了第一个要求 - 它保存了列宽的状态.我还使列强制所有三列的最小宽度.但据我了解,告诉拆分器按比例分割的方法是使用星形大小的列宽.由于我已经使用Width属性来保存和恢复状态,我不确定我能否达到我想要的目标.

有没有人设法保存列宽的状态并且拆分成比例？

这是我目前所拥有的一些代码:

   <Grid x:Name="mainGrid" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
        <Grid.ColumnDefinitions>
            <ColumnDefinition x:Name="leftColumn" Width="{Binding MainWindowLeftColumnWidth, Mode=TwoWay, Source={x:Static prop:Settings.Default}}" MinWidth="200" MaxWidth="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:MainWindow}}, Path=LeftColumnMaxWidth, Mode=OneWay}"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition x:Name="centerColumn" Width="{Binding MainWindowCenterColumnWidth, Mode=TwoWay, Source={x:Static prop:Settings.Default}}" MinWidth="300" MaxWidth="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:MainWindow}}, Path=CenterColumnMaxWidth, Mode=OneWay}"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition x:Name="rightColumn" Width="*" MinWidth="500"/>
        </Grid.ColumnDefinitions>
        <StackPanel x:Name="leftPanel" Grid.Column="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0"/>
        <GridSplitter x:Name="leftSplitter" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Stretch" ResizeBehavior="PreviousAndNext" Width="5" ResizeDirection="Columns"/>
        <StackPanel x:Name="centerPanel" Grid.Column="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0"/>
        <GridSplitter x:Name="rightSplitter" Grid.Column="3" HorizontalAlignment="Center" VerticalAlignment="Stretch" ResizeBehavior="PreviousAndNext" Width="5" ResizeDirection="Columns"/>
        <StackPanel x:Name="rightPanel" Grid.Column="4" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0" SizeChanged="rightPanel_SizeChanged"/>
    </Grid>

我对LeftColumnMaxWidth和CenterColumnMaxWidth都有double类型的依赖项属性.rightPanel_SizeChanged处理程序以及Loaded处理程序窗口都调用此方法:

    private void CalculateMaxWidths()
    {
          FrameworkElement content = Content as FrameworkElement;
          if (content != null)
          {
              LeftColumnMaxWidth = content.ActualWidth
                                 - leftSplitter.ActualWidth
                                 - centerColumn.ActualWidth
                                 - rightSplitter.ActualWidth
                                 - rightColumn.MinWidth;
              CenterColumnMaxWidth = content.ActualWidth
                                   - leftColumn.ActualWidth
                                   - leftSplitter.ActualWidth
                                   - rightSplitter.ActualWidth
                                   - rightColumn.MinWidth;
          }
    }

我还有一些工作要做,以确保调整窗口大小不会剪切右列.我认为这个解决方案可能与尝试按比例分割分割器有关.我当前设置的特殊特征是左分离器调整左右列的大小,并使中心列大小固定.

我不怕处理SizeChanged或DragDelta来实现我的目标.但我认为我不能做的实际上是设置前两列的Width属性,因为这会破坏我对保存状态的用户设置的绑定.

预先感谢您的任何帮助.

Answer 1

所以我相信我已经弄明白了.我的settings.settings中的某些旧值可能会导致我出现问题,而且我输入的默认值可能会导致问题.但这就是我所做的:

1. 更改了我的用户设置以保存所有三个(不仅仅是左边两个)列宽.并将它们保存为字符串.
2. 将用户设置中的默认值(以及列上的width属性)设置为200*.
3. 在所有三列上仅设置MinWidth - 而不是max.
4. 使用GridLengthConverter手动加载并保存列的用户设置.

我不是100%确信这是最好的方式,但它似乎确实有效,这让我很开心.万一有其他人遇到麻烦并遇到这篇文章,这里是工作XAML:

    <Grid x:Name="mainGrid" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
        <Grid.ColumnDefinitions>
            <ColumnDefinition x:Name="leftColumn" MinWidth="200" Width="200*"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition x:Name="centerColumn" MinWidth="300" Width="300*"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition x:Name="rightColumn" MinWidth="498" Width="498*"/>
        </Grid.ColumnDefinitions>
        <StackPanel x:Name="leftPanel" Grid.Column="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0"/>
        <GridSplitter x:Name="leftSplitter" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Stretch" ResizeBehavior="PreviousAndNext" Width="5" ResizeDirection="Columns"/>
        <StackPanel x:Name="centerPanel" Grid.Column="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0"/>
        <GridSplitter x:Name="rightSplitter" Grid.Column="3" HorizontalAlignment="Center" VerticalAlignment="Stretch" ResizeBehavior="PreviousAndNext" Width="5" ResizeDirection="Columns"/>
        <StackPanel x:Name="rightPanel" Grid.Column="4" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0" SizeChanged="rightPanel_SizeChanged"/>
    </Grid>

那个大小改变的事件仍然只用于调试跟踪.我输出Width的值来看看发生了什么.奇怪的是,在扩展所有内容并返回窗口的最小尺寸后,正确的列宽保持更大.但由于它们都具有最小宽度并且宽度都是星形尺寸,因此它可以自行解决.

我确实尝试将它放回绑定中,但由于我现在正在存储一个字符串,而GridLengthConverter是一个TypeConverter,而不是一个IValueConverter,它不起作用.我认为可以将值存储为GridLengths,尽管我已经达到了我对我所做的事情感到满意的程度.所以我的加载和保存是这样的:

    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized(e);

        //...

        try
        {
            GridLengthConverter converter = new GridLengthConverter();
            leftColumn.Width = (GridLength)converter.ConvertFromString(Settings.Default.MainWindowLeftColumnWidth);
            centerColumn.Width = (GridLength)converter.ConvertFromString(Settings.Default.MainWindowCenterColumnWidth);
            rightColumn.Width = (GridLength)converter.ConvertFromString(Settings.Default.MainWindowRightColumnWidth);

            Trace.WriteLine(string.Format("LOADED Left: {0}, Center: {1}, Right {2}", leftColumn.Width, centerColumn.Width, rightColumn.Width));
        }
        catch (Exception)
        {
            // Fail silently, the worse case is we go with the defaults, it's going to be okay
        }
    }

    protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
    {
        base.OnClosing(e);

        //...

        try
        {
            GridLengthConverter converter = new GridLengthConverter();
            Settings.Default.MainWindowLeftColumnWidth = converter.ConvertToString(leftColumn.Width);
            Settings.Default.MainWindowCenterColumnWidth = converter.ConvertToString(centerColumn.Width);
            Settings.Default.MainWindowRightColumnWidth = converter.ConvertToString(rightColumn.Width);

            Trace.WriteLine(string.Format("SAVED Left: {0}, Center: {1}, Right {2}", Settings.Default.MainWindowLeftColumnWidth, Settings.Default.MainWindowCenterColumnWidth, Settings.Default.MainWindowRightColumnWidth));
        }
        catch (Exception)
        {
            // Fail silently, the worst case is we don't save a little something, it's going to be okay
        }
    }

这一切都对我有用.所以我要去吧!

编辑:我后来做了一些改进,以防止右栏的"好奇心"保持更大.我现在将所有面板大小更改转到一个事件处理程序:

    private void PanelSizeChanged(object sender, SizeChangedEventArgs e)
    {
        // In order to keep the resizing from losing proportionality, we'll force it to be proportional to the current size.
        // Otherwise the right panel edges up and up while the other two remain at their starting 200*/300* values.
        // And when that happens eventually resizing the window only resizes the right panel, not proportionately as it does at the start.
        leftColumn.Width = new GridLength(leftColumn.ActualWidth, GridUnitType.Star);
        centerColumn.Width = new GridLength(centerColumn.ActualWidth, GridUnitType.Star);
        rightColumn.Width = new GridLength(rightColumn.ActualWidth, GridUnitType.Star);
    }