wpf - 如何解决 XAML 中的这个拉伸(stretch)问题？

Question

我有以下 XAML(简化):

<Grid x:Name="parentGrid">
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
    </Grid.RowDefinitions>

    <Grid Grid.Row="0">
        <!-- content which fits its parent grid -->
    </Grid>

    <Grid Grid.Row="1">
        <!-- content which fits its parent grid -->
    </Grid>

    <Grid Grid.Row="2">
        <!-- content which fits its parent grid -->
    </Grid>

    <Grid Grid.Row="3">
        <!-- content which fits its parent grid -->
    </Grid>
</Grid>

这是一个可配置的容器，其中包含我们的一到四个对话框。这个容器被多次重复使用，包含对话框的数量总是不同的。

要求是，如果只有一个对话框(因此只有第一个网格被填充)，它应该延伸到整个父网格。如果有两个网格填充，每个容器应该填充父网格的一半。如果有三个……等等。

我无法让它与 <RowDefinition Height="Auto"/> 一起工作(无论如何默认)也不 <RowDefinition Height="*"/> .例如，如果只有一个 Grid 填充，则它不适合整个父网格。如果我删除三个 RowDefinitions , 但它有效。

附加信息:非填充网格可见性始终设置为 Visibility.Collapsed .

Answer 1

我总是发现，如果你想隐藏一个列或行，你可以像这样绑定(bind)一个属性:

<Grid x:Name="ParentGrid">
    <Grid.RowDefinitions>
        <RowDefinition Height="{Binding GridRow0}" />
        <RowDefinition Height="{Binding GridRow1}" />
        <RowDefinition Height="{Binding GridRow2}" />
        <RowDefinition Height="{Binding GridRow3}" />
    </Grid.RowDefinitions>
<-- grid contents -->
</Grid>

设置如下属性:

Public Property GridRow0 as GridLength = New GridLength(GridUnitType.Star)
Public Property GridRow1 as GridLength = New GridLength(GridUnitType.Star)
Public Property GridRow2 as GridLength = New GridLength(GridUnitType.Star)
Public Property GridRow3 as GridLength = New GridLength(GridUnitType.Star)

然后当您计算出需要多少行时，您可以执行一些操作，例如将计数传递给过程:

Public Sub FixRows(count as Integer)
    Select Case count
        Case 1
            GridRow3 = New GridLength(0)
            GridRow2 = New GridLength(0)
            GridRow1 = New GridLength(0)
            GridRow0 = New GridLength(GridUnitType.Star)
        Case 2
            GridRow3 = New GridLength(0)
            GridRow2 = New GridLength(0)
            GridRow1 = New GridLength(GridUnitType.Star)
            GridRow0 = New GridLength(GridUnitType.Star)
        Case 3
            GridRow3 = New GridLength(0)
            GridRow2 = New GridLength(GridUnitType.Star)
            GridRow1 = New GridLength(GridUnitType.Star)
            GridRow0 = New GridLength(GridUnitType.Star)
        Case 4
            GridRow3 = New GridLength(GridUnitType.Star)
            GridRow2 = New GridLength(GridUnitType.Star)
            GridRow1 = New GridLength(GridUnitType.Star)
            GridRow0 = New GridLength(GridUnitType.Star)
        Case Else
            'Whatever is needed
    End Select
End Sub