wpf 如何从 XAML 为样式中的控件指定工具提示？
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How to specify a ToolTip for a control in a Style from XAML?
提问by Sean Turner
I'm using a the WPF datagrid from the Microsoft CodePlex project. I have a custom control that I want to databind to a field from the row of the datagrid. I can't for the life of me figure out how to specify a tooltip on a datagrid row.
我正在使用 Microsoft CodePlex 项目中的 WPF 数据网格。我有一个自定义控件，我想将其数据绑定到数据网格行中的一个字段。我一生都无法弄清楚如何在数据网格行上指定工具提示。
The closest I've come is to use a RowStyle with a Setter to set the tooltip, but this only seems to work for text. When I try to put a ControlTempalte in as the Value for the ToolTip, it displays the result of calling ToString on the ControlTemplate type.
我最接近的是使用带有 Setter 的 RowStyle 来设置工具提示，但这似乎只适用于文本。当我尝试将 ControlTempalte 作为 ToolTip 的值放入时，它会显示在 ControlTemplate 类型上调用 ToString 的结果。
I think I need to set the "Template" property of the ToolTip, but I can't seem to figure out how to do that...
我想我需要设置工具提示的“模板”属性，但我似乎无法弄清楚如何做到这一点......
<dg:DataGrid Name="dgResults" AutoGenerateColumns="True">
<dg:DataGrid.RowStyle >
<Style TargetType="{x:Type dg:DataGridRow}">
<Setter Property="ToolTip" >
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToolTip}">
<StackPanel>
<TextBlock>txt1</TextBlock><TextBlock>txt2</TextBlock>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</dg:DataGrid.RowStyle>
</dg:DataGrid>
回答by Sean Turner
Figured it out... took me about 6 hours...
想通了......花了我大约6个小时......
For some reason, I can't set the value directly using Value.Setter. If I define the content for the tooltip as a static resource though, and then set it in the Style property of the DataGrid.RowStyle it works.
出于某种原因，我无法直接使用 Value.Setter 设置值。如果我将工具提示的内容定义为静态资源，然后在 DataGrid.RowStyle 的 Style 属性中设置它，它就可以工作。
So, the datagrid row style looks like:
因此，数据网格行样式如下所示：
<Style TargetType="{x:Type dg:DataGridRow}">
<Setter Property="ToolTip" Value="{StaticResource resKWIC}">
</Setter>
</Style>
</dg:DataGrid.RowStyle>
And the resource is
而且资源是
<Window.Resources>
<StackPanel x:Key="resKWIC">
<TextBlock>f1</TextBlock>
<TextBlock>f2></TextBlock>
</StackPanel>
</Window.Resources>
Thanks!
谢谢！
回答by TI82
The key is to use the Property ToolTipService.ToolTip, instead of ToolTip - like this:
关键是使用属性 ToolTipService.ToolTip，而不是 ToolTip - 像这样：
<Setter Property="ToolTipService.ToolTip" Value="My Tooltip"/>
回答by ValiantBoy
I also got this working with a couple of changes; included incase it helps someone.
我也做了一些改变；包括柜面它可以帮助某人。
My Datadrid is bound to a list of custom objects, I wanted to display the string "Name" as a column and the string "text" in the tooltip. The trick for me (newbe) was that I had to include the Text Column and hide it for it to show up in the tooltip, i.e.:
我的 Datadrid 绑定到自定义对象列表，我想在工具提示中显示字符串“Name”作为列和字符串“text”。我（新手）的诀窍是我必须包含文本列并将其隐藏才能显示在工具提示中，即：
<DataGrid AutoGenerateColumns="False" CanUserAddRows="False" EnableRowVirtualization="False" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch" IsReadOnly="True" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" Name="dgrTextGroupText" VerticalContentAlignment="Stretch" Grid.Column="3" Grid.Row="1" Grid.RowSpan="6" CanUserReorderColumns="False" CanUserSortColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name}" Width="*" />
<DataGridTextColumn Binding="{Binding Text}" Width="0" Visibility="Hidden" />
</DataGrid.Columns>
<DataGrid.RowStyle>
<Style TargetType="{x:Type DataGridRow}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=DataContext.text}" />
</Trigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
</DataGrid>
回答by sondlerd
I needed to set the tooltip dynamically based on the cell content. I'm using the tooltip to display text overflow text from the cell. The binding below is from a c# class property named CellText. Thanks to the posts above for allowing me to avoid figuring out the entire thing myself.
我需要根据单元格内容动态设置工具提示。我正在使用工具提示显示单元格中的文本溢出文本。下面的绑定来自名为 CellText 的 ac# 类属性。感谢上面的帖子让我避免自己弄清楚整个事情。
<DataGridTextColumn Header="HeaderText" Binding="{Binding DisplayText, Mode=OneWay}" Width="33*">
<DataGridTextColumn.CellStyle>
<Style>
<Setter Property="ToolTipService.ToolTip" Value="{Binding DisplayText, Mode=OneWay}"/>
</Style>
</DataGridTextColumn.CellStyle>
</DataGridTextColumn>
回答by Kent Boogaart
There's no need for the ControlTemplate. If you want the StackPanelin the ToolTip, just set it as:
不需要ControlTemplate. 如果你想在StackPanel中ToolTip，只需将其设置为：
<Setter Property="ToolTip">
<Setter.Value>
<StackPanel>
<TextBlock>txt1</TextBlock><TextBlock>txt2</TextBlock>
</StackPanel>
</Setter.Value>
</Setter>
回答by Jake Ginnivan
Not sure you can do it through XAML.
不确定您是否可以通过 XAML 做到这一点。
A easier way might be to just handle the LoadingRow event. In xaml have something like:
一种更简单的方法可能是仅处理 LoadingRow 事件。在 xaml 中有类似的东西：
<dg:DataGrid Name="dgResults" AutoGenerateColumns="True"
LoadingRow="dgResults_LoadingRow"
ItemsSource="{Binding ListOfStrings}" />
Then in code behind
然后在后面的代码中
void dgResults_LoadingRow(object sender, DataGridRowEventArgs e)
{
DataGridRow row = e.Row;
row.ToolTip = row.DataContext as string;
}
Obviously you will have to change the code depending on how you are populating the data in the datagrid. This is also untested =)
显然，您必须根据在数据网格中填充数据的方式来更改代码。这也是未经测试的 =)
