我在尝试为LineChart点构建自定义工具提示时,一步一步地按照lvChart Customizing Tooltips进行操作。但我得到空的工具提示内容。除了对ChartValues类型使用ObservableValue之外,我的代码几乎与lvChart教程中使用的代码相同。我没有使用任何MV **。
是否有人制定了教程或在LineChart上应用自定义工具提示?
Main.xaml
<lvc:CartesianChart.DataTooltip>
<local:MyTooltip />
</lvc:CartesianChart.DataTooltip>
Main.xaml.cs
MyTooltipContents = new ChartValues<MyTooltipContent>();
for (int i = 0; i < MyData.Count(); i++)
{
MyTooltipContents.Add(new MyTooltipContent
{
Name = "No" + i,
Value = "Foo"
});
}
var MyTooltipContentMapper = Mappers.Xy<MyTooltipContent>()
.X((value, index) => index)
.Y(value => 1);
//lets save the mapper globally
Charting.For<MyTooltipContent>(MyTooltipContentMapper);
DataContext = this;
MyTooltip.xaml
<UserControl x:Class="MyNamespace.MyTooltip"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:MyNamespace"
xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
d:DataContext="{d:DesignInstance local:MyTooltip}"
Background="#E4555555" Padding="20 10" BorderThickness="2" BorderBrush="#555555">
<ItemsControl ItemsSource="{Binding Data.Points}" Grid.IsSharedSizeScope="True">
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type lvc:DataPointViewModel}">
<Grid Margin="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="Name"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="Value"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="1" Text="{Binding ChartPoint.Instance.(local:MyTooltipContent.Name)}"
Margin="5 0 0 0" VerticalAlignment="Center" Foreground="White" />
<TextBlock Grid.Column="2" Text="{Binding ChartPoint.Instance.(local:MyTooltipContent.Value)}"
Margin="5 0 0 0" VerticalAlignment="Center" Foreground="White"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</UserControl>
MyToolTip.xaml.cs
public partial class MyTooltip : IChartTooltip
{
private TooltipData _data;
public MyTooltip()
{
InitializeComponent();
DataContext = this;
}
public event PropertyChangedEventHandler PropertyChanged;
public TooltipData Data
{
get { return _data; }
set
{
_data = value;
OnPropertyChanged("Data");
}
}
public TooltipSelectionMode? SelectionMode { get; set; }
protected virtual void OnPropertyChanged(string propertyName = null)
{
if (PropertyChanged != null)
PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
MyTooltipContent.cs
public class MyTooltipContent
{
public string Name { get; set; }
public string Value { get; set; }
}
答案 0 :(得分:0)
我复制了您的示例,并且对我有用。
您可能希望查看 Main.xaml.cs 上的MyTooltipContents
声明,该声明应该是公共属性:
public ChartValues<MyTooltipContent> MyTooltipContents { get; set; }
我不知道是什么给了您系列行,但是我在MainWindow.xaml(对应于您的Main.xaml)上使用了这个系列:
<Window x:Class="MyToolTipExample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:MyToolTipExample"
xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<lvc:CartesianChart LegendLocation="Right">
<lvc:CartesianChart.Series>
<lvc:LineSeries Title="Customers" Values="{Binding MyTooltipContents}"></lvc:LineSeries>
</lvc:CartesianChart.Series>
<lvc:CartesianChart.DataTooltip>
<local:MyTooltip/>
</lvc:CartesianChart.DataTooltip>
</lvc:CartesianChart>
</Grid>
</Window>
请注意,MyTooltipContents
已绑定到LineSeries
。