WPF如何在GridSplitter列调整大小时使Grid重新评估最大宽度? [英] WPF how to make Grid Reevaluate Max Widths on GridSplitter Column Resize?

问题描述

所以我有一个带有一列定义的网格.初始列宽属性是从应用程序的设置初始化的，该属性可以正常运行，然后我尝试为列设置最大大小，以使用户无法调整屏幕大小，从而无法正确显示内容.

So I have this grid with a bunch of column definitions. The initial column width property is initialized from the settings of the app, which works correctly, then I try to make a max size for the columns so that the user cannot resize the screen so that things don't appear correctly.

用于计算最大宽度的多重绑定似乎正常工作.但是，我遇到的问题是，当网格拆分器更改实际宽度的值时，多重绑定不会重新计算MaxWidth的值.我在转换器内部设置了一个断点，但是没有命中.

The multibinding that is used to calculate the max width seems to be working properly. However, the issue I have is that the multibinding does not Recalculate the value of MaxWidth when a gridsplitter changes the values of the actual width. I have a breakpoint set inside the converter but it is not hit.

但是，我不知道怎么回事，因为根据GridSplitter的文档:

However, I don't see how that can be, because according to GridSplitter's documentation:

http://msdn.microsoft.com/zh-CN/library/system.windows.controls.gridsplitter%28v=vs.110%29.aspx

使用网格拆分器调整大小应更改列定义的实际宽度.

Resizing with a gridsplitter should change the actualwidth of a columndefinition.

如果是这种情况，那么我希望多重绑定能够更新.但是，我没有看到这个.

If that is the case, then I would expect the multibinding to update. However, I'm not seeing this.

  <Grid.ColumnDefinitions>
  <ColumnDefinition 
      x:Name="NameListViewColumn"
      MinWidth="100"
      Width="{Binding NameListViewWidth, Source={x:Static DaedalusGraphViewer:SettingsManager.AppSettings}, Mode=OneTime,
                      Converter={StaticResource GridLengthConverter}}"              
      >
    <ColumnDefinition.MaxWidth>
      <MultiBinding Converter="{StaticResource SignalNameColumnMaxSizeConverter}">
        <Binding Path="ActualWidth" 
                 ElementName="NameListViewColumn"
                 />
        <Binding Path="ActualWidth" 
                 ElementName="SignalValuesListViewColumn"
                 />
       <Binding Path="ActualWidth" 
                ElementName="SignalTreeViewColumn"
                />

        <Binding ElementName="SignalValuesListViewColumn" Path="MinWidth" />
        <Binding ElementName="SignalTreeViewColumn" Path="MinWidth" />

      </MultiBinding>
    </ColumnDefinition.MaxWidth>

  </ColumnDefinition>
    <ColumnDefinition Width="Auto" x:Name="SignalNamesGridSpitter"/>
  <ColumnDefinition 
      MinWidth="100"
      x:Name="SignalValuesListViewColumn"
      Width="{Binding SignalValuesListViewWidth, Source={x:Static DaedalusGraphViewer:SettingsManager.AppSettings}, 
                      Mode=OneTime, Converter={StaticResource GridLengthConverter}}"
      >
    <ColumnDefinition.MaxWidth>
      <MultiBinding Converter="{StaticResource SignalValuesMaxSizeConverter}">
        <Binding Path="ActualWidth" 
                 ElementName="SignalValuesListViewColumn"
                 />
        <Binding Path="ActualWidth" 
                 ElementName="SignalTreeViewColumn"
                 />


        <Binding ElementName="SignalTreeViewColumn" Path="MinWidth" />

      </MultiBinding>
    </ColumnDefinition.MaxWidth>
  </ColumnDefinition>
    <ColumnDefinition x:Name="SignalValuesGridSplitter" Width="Auto"/>
    <ColumnDefinition 
      x:Name="SignalTreeViewColumn"
      MinWidth="100"
      Width="*"
      />
    <ColumnDefinition Width="18" MinWidth="18" x:Name="VerticalScrollBarColumn"/>
  </Grid.ColumnDefinitions>

推荐答案

在这里找到了答案:基本上，实际的width属性没有实现INotifyPropertyChanged.

Found the answer here: basically the actual width property doesn't implement INotifyPropertyChanged.

绑定到ColumnDefinition.ActualWidth返回0

这篇关于WPF如何在GridSplitter列调整大小时使Grid重新评估最大宽度?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！