为什么 WPF 网格的行高不调整为其内容的高度?
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12-11-2019 - |
题
我有一个与此类似的网格:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="MyHeader1"/>
<myNamespace:MyRotatedTextBlock
Grid.Row="1" Grid.Column="0" MyText="MyHeader2"/>
</Grid>
myNamespace:MyRotatedTextBlock 是一个自定义 WPF 控件,如下所示:
<TextBlock Text="{Binding MyText}"
HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock.LayoutTransform>
<RotateTransform Angle="90"/>
</TextBlock.LayoutTransform>
</TextBlock>
问题是当我打开窗口时,我看不到包含旋转文本的第二行。但如果我更换 Height
第二行(设置为 "Auto"
) 和 "100"
然后我可以看到显示了第二行,它包含 MyHeader2
解决方案
您还可以从 TextBlock (而不是 userControl)派生,如下所示:
<TextBlock x:Class="WpfGridRowHeightStackOverflowQuestion.MyRotatedTextBlock"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<TextBlock.LayoutTransform>
<RotateTransform Angle="90"/>
</TextBlock.LayoutTransform>
</TextBlock>
然后只需使用 TextBlock 中的 Text 属性,如下所示:
<myNamespace:MyRotatedTextBlock Grid.Row="1" Grid.Column="0" Text="MyHeader2"></myNamespace:MyRotatedTextBlock>
编辑
这样它也可以作为 UserControl 工作(因为绑定的元素名称被显式指定为用户控件的名称):
<UserControl x:Class="WpfGridRowHeightStackOverflowQuestion.MyRotatedTextBlock"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
Name="CustomRotatedTextBlock">
<TextBlock Text="{Binding ElementName=CustomRotatedTextBlock,Path=MyText}" HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock.LayoutTransform>
<RotateTransform Angle="90"/>
</TextBlock.LayoutTransform>
</TextBlock>
</UserControl>
然后我在代码后面使用 INotifyPropertyChanged 的更改通知(WPF 严重依赖它;)
public partial class MyRotatedTextBlock : UserControl, INotifyPropertyChanged
{
public MyRotatedTextBlock()
{
InitializeComponent();
}
private String _myText;
public String MyText
{
get { return _myText; }
set {
_myText = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("MyText"));
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
}
其他提示
你试过了吗 UpdateLayout
?打开窗口后尝试网格的 UpdateLayout
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