使其可见后调整 GridView 列的大小
设置：
ListView 和 GridView 在窗口加载时最初是隐藏的，然后在特定的用户操作时变得可见。
目标：
能够设置GridView列的相对宽度。
问题：
我需要的可以通过使用宽度转换器来实现（类似于答案此处），或者通过在ListView（请参阅此解决方案）。 这两种方法似乎都是有效的 - 但仅适用于从早期开始呈现的控件。 就我而言，进行计算时 ActualWidth 始终为 0，并且当 ListView 可见时不会重复这些计算。
所以，我猜，这里真正的问题是当ListView的ActualWidth大于0时如何重新评估列的宽度。
解决方案最好位于XAML 级别，不涉及代码隐藏 - 但这也可以，如果这是唯一的选择；-)
有什么建议吗？
PS 在下面 Chris 的问题之后，这里澄清了 ListView 如何隐藏/显示：它是另一个容器控件的子控件，托管在网格列中，并且该列的宽度由触发器操纵。
<ColumnDefinition>
<ColumnDefinition.Style>
<Style>
<Setter Property="ColumnDefinition.Width" Value="4*"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=OpenItems.Count}" Value="0">
<Setter Property="ColumnDefinition.Width" Value="0"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ColumnDefinition.Style>
</ColumnDefinition>
我尝试对 ListView 的容器本身应用类似的触发器（以在 Collapsed 和 Visible 之间操纵其可见性），但问题是 Column 不会从其原始 4* 宽度缩小，所以我看到 (empty ) 控制何时应该隐藏它。
The setup:
ListView with GridView that is initially hidden when the window is loaded, and then made visible upon a certain user action.
The aim:
Be able to set relative width of GridView's columns.
The problem:
What I need can be achieved either by using a converter on the width (something similar to the answer here), or by adding a Behavior on the ListView (see this solution).
The both approaches seem to be valid - but only for the controls that are rendered from the early beginning.
In my case, the ActualWidth is always 0 when the calculations are made, and these calculations are not repeated when the ListView is made visible.
So, I guess, the real question here is how to get the columns' Width to be re-evaluated when ListView's ActualWidth gets greater than 0.
The solution would preferably be at the XAML level, without involving the code-behind - but that will do too, if that's the only alternative ;-)
Any suggestions?
P.S. Following Chris's question below, here's a clarification on how the ListView is hidden/shown: it's a child of another container control, hosted in a Grid column, and the width of that column is manipulated by a trigger.
<ColumnDefinition>
<ColumnDefinition.Style>
<Style>
<Setter Property="ColumnDefinition.Width" Value="4*"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=OpenItems.Count}" Value="0">
<Setter Property="ColumnDefinition.Width" Value="0"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ColumnDefinition.Style>
</ColumnDefinition>
I tried to apply a similar trigger to the ListView's container itself (to manipulate its Visibility between Collapsed and Visible) instead, but the problem with that is that the Column doesn't shrink from its original 4* width, so I see the (empty) control when it's supposed to be hidden.
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评论（1）
你如何隐藏/显示ListView？这个问题似乎暗示您是通过将 Width 属性设置为 0 （或非零来显示它）来实现的。相反，您应该尝试使用 可见性 属性（设置为“折叠”以隐藏，或设置为“可见”以显示）。这应该会导致重新评估列的宽度。
更新：
根据您更新的问题，我建议查看此解决方案： http:// /www.codeproject.com/KB/grid/ListView_layout_manager.aspx
我从这里得到它FWIW：WPF：扩展 ListView 的 GridView 的最后一列
How are you hiding/showing the ListView? The question seems to imply that you are doing so by setting the Width property to 0 (or non-zero to show it). Instead, you should try using the Visibility property (set to "Collapsed" to hide, or "Visible" to show). This should cause the column's width to be re-evaluated.
UPDATE:
Based on your updated question, I'd suggest checking out this solution: http://www.codeproject.com/KB/grid/ListView_layout_manager.aspx
I got it from here FWIW: WPF : Extend last column of ListView's GridView