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[英]How to grow/shrink a TextBlock (Font Size) to the available space in WPF?
[英]How to prevent TextBlock taking all the available space
这是我的问题。 我建立了以下ListView
<ListView Grid.Row="1" x:Name="messageList" BorderThickness="0"
ItemsSource="{Binding MySource}"
HorizontalContentAlignment="Stretch">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5*"/>
<ColumnDefinition Width="5*"/>
</Grid.ColumnDefinitions>
<WrapPanel Grid.Row="0" Grid.Column="0">
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Received.SenderId}"
/>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Received.DeliverDate}"
/>
</WrapPanel>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Received.MsgText}"
Grid.Row="1" Grid.Column="0"
TextWrapping="WrapWithOverflow">
</TextBlock>
<WrapPanel Grid.Row="0" Grid.Column="1">
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Sent.SenderId}"
/>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Sent.DeliverDate}"
/>
</WrapPanel>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Sent.MsgText}"
Grid.Row="1" Grid.Column="1"
TextWrapping="WrapWithOverflow">
</TextBlock>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
对于MySource
每个元素,“已接收”和“已发送”之间只有1不为空。 ListView
按照我的预期工作,将元素放在屏幕的左侧或右侧,但是如果消息太长,则包含MsgText
的TextBlock
将获得所有可用空间(因此整行)。 我如何限制它只保留在父网格的一半中,并最终使文本溢出?
编辑 :我添加了图像显示我的问题。 第四条消息应该溢出,但不会溢出
我花了几分钟来制作mcve ,但是这个难题的缺失部分是:
<Grid MaxWidth="{Binding ActualWidth, RelativeSource={RelativeSource AncestorType={x:Type ListView}}}">
那将限制所有Grid
的最大宽度(每一项都有一个),然后进行包装。 否则, Grid
会要求一个宽度以使整个项目适合一行,而ListView
可以使用它,但是您将看到水平滚动条(包括我在内的用户最讨厌的控件)。
MCVE:
public partial class MainWindow : Window
{
public class Item
{
public string Received { get; set; }
public string Sent { get; set; }
}
public List<Item> Items { get; }
public MainWindow()
{
InitializeComponent();
Items = new List<Item>
{
new Item { Received = "1111 111 11 111 11 1" },
new Item { Received = "2222 2 22 2 2 222222222 2 222222 22222222 222222222222 2" },
new Item { Sent = "333333333 3333333 333 33333 3 3 33 333333333 3333" },
new Item { Received = "444444444444444 444 44444444444444 44 4 44444444444444444 4 4 4444444444 4 444 444444444444" },
};
DataContext = this;
}
}
截图:
XAML:
<ListView ItemsSource="{Binding Items}">
<ListView.ItemTemplate>
<DataTemplate>
<Grid MaxWidth="{Binding ActualWidth, RelativeSource={RelativeSource AncestorType={x:Type ListView}}}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Received}"
TextWrapping="WrapWithOverflow" />
<TextBlock Grid.Column="1"
Text="{Binding Sent}"
TextWrapping="WrapWithOverflow" />
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment"
Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>
</ListView>
问题是您的网格(和列的宽度)是针对列表中的每个元素计算的,因此占用了尽可能多的空间。 我提出了一个备份解决方案,但没有找到更好的解决方案,但结果在那里。
这是将2个ListView放置在一个网格的2列中,然后将Received元素放在一个网格中,将Sent放在另一个网格中。
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<ListView Grid.Column="0" x:Name="messageListReceived" BorderThickness="0"
ItemsSource="{Binding MySource}"
HorizontalContentAlignment="Stretch">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<WrapPanel Grid.Row="0">
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Received.SenderId}"
/>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Received.DeliverDate}"
/>
</WrapPanel>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Received.MsgText}"
Grid.Row="1"
TextWrapping="WrapWithOverflow">
</TextBlock>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<ListView Grid.Column="1" x:Name="messageListSent" BorderThickness="0"
ItemsSource="{Binding MySource}"
HorizontalContentAlignment="Stretch">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<WrapPanel Grid.Row="0">
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Sent.SenderId}"
/>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Sent.DeliverDate}"
/>
</WrapPanel>
<TextBlock Margin="2"
VerticalAlignment="Center"
Text="{Binding Sent.MsgText}"
Grid.Row="1"
TextWrapping="WrapWithOverflow">
</TextBlock>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
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