尝试为实时图表 WPF 创建自定义工具提示 - 工具提示不显示数据

Question

所有，我有很多问题显示自定义工具提示为我的LiveCharts控件这是我的代码和我所尝试的。

c#代码:

public partial class Chart : UserControl
{
public ChartData chartData { get; set; }

public Chart()
{
chartData = new ChartData();
InitializeComponent();
Loaded += Control_Loaded;
}
private void Control_Loaded(object sender, RoutedEventArgs e)
{
// build here
DataContext = this;
chartData.Formatter = value => value.ToString("C", CultureInfo.CurrentCulture);

}
}

图表XAML:

<UserControl x:Class="LandlordTenantDatabaseWPF.Chart"
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" 
xmlns:local="clr-namespace:LandlordTenantDatabaseWPF"
xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
mc:Ignorable="d" 
d:DesignHeight="450" d:DesignWidth="800" d:DataContext="{d:DesignInstance local:Chart}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>

<TextBlock x:Name="txtTitle" Grid.Row="0" Text="{Binding chartData.Title}" Foreground="#FF4B52E4" FontSize="36" TextAlignment="Center"/>

<lvc:CartesianChart x:Name="chart" Grid.Row="1" Series="{Binding chartData.SeriesCollection}" LegendLocation="Right" >            

<lvc:CartesianChart.AxisX>
<lvc:Axis Title="Month" Labels="{Binding chartData.Labels}"></lvc:Axis>
</lvc:CartesianChart.AxisX>
<lvc:CartesianChart.AxisY>
<lvc:Axis Title="Payments" LabelFormatter="{Binding chartData.Formatter}"></lvc:Axis>
</lvc:CartesianChart.AxisY>
<lvc:CartesianChart.DataTooltip>
<local:CustomersTooltip/>
</lvc:CartesianChart.DataTooltip>
</lvc:CartesianChart>            
</Grid>

工具提示c#代码:

public partial class CustomersTooltip : IChartTooltip
{
private TooltipData _data;
public CustomersTooltip()
{
InitializeComponent();
//LiveCharts will inject the tooltip data in the Data property
//your job is only to display this data as required
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));
}
}

提示XAML:

<UserControl x:Class="LandlordTenantDatabaseWPF.CustomersTooltip"
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"
xmlns:wpf="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
xmlns:local="clr-namespace:LandlordTenantDatabaseWPF"
mc:Ignorable="d" 
d:DesignHeight="300" d:DesignWidth="300" 
d:DataContext="{d:DesignInstance local:CustomersTooltip}"
Background="#E4555555" Padding="20 10" BorderThickness="2" BorderBrush="#555555">
<ItemsControl ItemsSource="{Binding Data.Points}" Grid.IsSharedSizeScope="True">
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type wpf:DataPointViewModel}">
<Grid Margin="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="Title"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="LastName"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="Phone"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="PurchasedItems"/>
</Grid.ColumnDefinitions>
<Rectangle Grid.Column="0" Stroke="{Binding Series.Stroke}" Fill="{Binding Series.Fill}"
Height="15" Width="15"></Rectangle>
<TextBlock Grid.Column="1" Text="{Binding ChartPoint.Instance.(local:CustomerVm.Name)}" 
Margin="5 0 0 0" VerticalAlignment="Center" Foreground="White"/>
<TextBlock Grid.Column="2" Text="{Binding ChartPoint.Instance.(local:CustomerVm.LastName)}" 
Margin="5 0 0 0" VerticalAlignment="Center" Foreground="White"/>
<TextBlock Grid.Column="3" Text="{Binding ChartPoint.Instance.(local:CustomerVm.Phone), 
StringFormat=Phone: {0}}" 
Margin="5 0 0 0" VerticalAlignment="Center" Foreground="White"/>
<TextBlock Grid.Column="4" Text="{Binding ChartPoint.Instance.(local:CustomerVm.PurchasedItems), 
StringFormat=Purchased Items: {0:N}}" 
Margin="5 0 0 0" VerticalAlignment="Center" Foreground="White"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

ChartData类:

public class ChartData : INotifyPropertyChanged
{
private SeriesCollection seriesCollection;
public SeriesCollection SeriesCollection
{
get { return seriesCollection; }
set
{
if (seriesCollection != value)
{
seriesCollection = value;
OnPropertyChanged("seriesCollection");
}
}
}
private string[] labels;
public string[] Labels
{
get { return labels; }
set
{
if(labels != value)
{
labels = value;
OnPropertyChanged("labels");
}
}
}
private string title;
public string Title 
{ 
get { return title; } 
set
{
if(title != value)
{
title = value;
OnPropertyChanged("title");
}
}
}
private Func<double, string> formatter;
public Func<double, string> Formatter 
{ 
get { return formatter; }
set
{
if(formatter != value)
{
formatter = value;
OnPropertyChanged("formatter");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}

和包含图表的窗口:

private void AddNewSeries(List<double> lstPayments, string sSeriesName, SolidColorBrush colorBrush)
{
if (m_SeriesCollection == null)
{
m_SeriesCollection = new SeriesCollection
{ new ColumnSeries
{
Values = new ChartValues<double>(lstPayments),
Title = sSeriesName,
Fill = colorBrush                        
}
};
}
else
{
m_SeriesCollection.Add(
new ColumnSeries
{
Values = new ChartValues<double>(lstPayments),
Title = sSeriesName,
Fill = colorBrush
}
);
}
}
private void UpdateChartsBasedOnDates(Chart chart, string sChartTitle)
{    //Pass data to the chart       
chart.chartData.SeriesCollection = m_SeriesCollection;
chart.chartData.Labels = GetFormattedDates(m_lstCombinedDates);
chart.chartData.Title = sChartTitle;            
}

当我只允许默认工具提示显示在图表上时，这一切都工作得很好。我挂在图表数据是由SeriesCollection提供的事实上，但是自定义工具提示，在LiveCharts网站https://lvcharts.net/App/examples/v1/wpf/Tooltips%20and%20Legends的示例中不使用SeriesCollection。我的自定义图表控件显示的一些图表有超过1个系列。我尝试将Tooltip控件绑定到SeriesCollection以获取数据值，但这不起作用。当然我可能做错了。显然，我在这里展示的工具提示XAML来自LiveCharts网站上的示例代码，但我不知道从这里到哪里。

是否可以使用make工具提示使用系列集合?对我来说，使用系列集合或ChartData类，或者我可以使用

的最佳方式是什么?

public TooltipData Data
{
get { return _data; }
set
{
_data = value;
OnPropertyChanged("Data");
}
}

从工具提示c#代码显示在工具提示中的数据?

我很困惑。

编辑:我忘了说我的目标是什么。我想显示一个工具提示，上面写着

string.Format("{0} Payment: ${1}", SeriesName, PaymentAmount);

这将显示租金支付:$1000。或mortgagepaypayment: $1000.00

Answer 1

虽然我不是LiveCharts工具提示高手，但我还是设法得到了一个适合我的版本。我的图表也使用了SeriesCollection，所以也许这对你有帮助。

我是这样把它整合到我的图表里的:

CartesianChart cartesianChart = ...;
_cartesianChart.DataTooltip = new CustomTooltip
{
SelectionMode = TooltipSelectionMode.OnlySender
};

这是我的CustomToolTip类(我相信这几乎是直接从某处的文档):

public partial class CustomTooltip : UserControl, IChartTooltip
{
private TooltipData _data;
public CustomTooltip()
{
InitializeComponent();
//LiveCharts will inject the tooltip data in the Data property
//your job is only to display this data as required
DataContext = this;
}
public event PropertyChangedEventHandler PropertyChanged;
public TooltipData Data
{
get => _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));
}
}
public partial class CustomTooltip : UserControl, IChartTooltip, INotifyPropertyChanged
{
private bool _contentLoaded;
[System.Diagnostics.DebuggerNonUserCodeAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("PresentationBuildTasks", "4.0.0.0")]
public void InitializeComponent()
{
if (_contentLoaded)
return;
System.Uri resourceLocater = new System.Uri(
"/Plotting/CustomTooltipDesign.xaml",
System.UriKind.Relative
);
System.Windows.Application.LoadComponent(this, resourceLocater);
_contentLoaded = true;
}
}

然后我构建了一个XAML组件，就像您一样。第一个超级简单:

public partial class CustomTooltipDesign : UserControl
{
public CustomTooltipDesign()
{
DataContext = this;
}
}

然后我花了更多的精力来构建实际的工具提示:

<UserControl x:Class="expomrf4utility.CustomTooltipDesign"
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"
xmlns:expomrf4utility="clr-namespace:ExpoMRF4Utility" 
xmlns:wpf="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
mc:Ignorable="d" 
d:DataContext="{d:DesignInstance expomrf4utility:CustomTooltip}"
x:Name="Control" d:DesignWidth="1" d:DesignHeight="1">
<UserControl.Resources>
<Style TargetType="TextBlock">
<Setter Property="Foreground" Value="{Binding Foreground}"></Setter>
</Style>
<wpf:SharedConverter x:Key="SharedConverter"/>
<wpf:SharedVisibilityConverter x:Key="SharedVisibilityConverter"/>
<wpf:ChartPointLabelConverter x:Key="ChartPointLabelConverter"/>
<wpf:ParticipationVisibilityConverter x:Key="ParticipationVisibilityConverter"/>
<BooleanToVisibilityConverter x:Key="Bvc"></BooleanToVisibilityConverter>
<CollectionViewSource x:Key="GroupedPoints" Source="{Binding Data.Points}"/>
</UserControl.Resources>
<UserControl.Template>
<ControlTemplate>
<Grid VerticalAlignment="Center" HorizontalAlignment="Center" >
<StackPanel Orientation="Vertical">
<ItemsControl ItemsSource="{Binding Source={StaticResource GroupedPoints}}" Grid.IsSharedSizeScope="True">
<ItemsControl.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<ContentPresenter Content="{Binding Name}" />
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ItemsControl.GroupStyle>
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type wpf:DataPointViewModel}">
<Grid Margin="2" VerticalAlignment="Center" HorizontalAlignment="Center" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto" SharedSizeGroup="Title"/>
<RowDefinition Height="Auto" SharedSizeGroup="Label"/>
<RowDefinition Height="Auto" SharedSizeGroup="Label"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="1" Text="{Binding Series.Title}" HorizontalAlignment="Left" FontWeight="Bold"/>
<TextBlock Grid.Row="2" Text="{Binding ChartPoint.Y, StringFormat='Value: {0} V/m'}" HorizontalAlignment="Left"/>
<TextBlock Grid.Row="3" Text="{Binding ChartPoint, Converter={StaticResource ChartPointLabelConverter}, StringFormat='Datetime: {0}'}" HorizontalAlignment="Left"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</Grid>
</ControlTemplate>
</UserControl.Template>

请注意，我必须为我想要显示的不同属性创建绑定。为了达到这个目的，我在创建数据集的时候稍微做了一些手脚。我用的是GLineSeries，但我有一种感觉，它应该与其他系列工作，以及:

int bandIndex = ...;
GearedValues<double> gearedValues = (some double[] data).AsGearedValues();
series.Add(new GLineSeries
{
Values = gearedValues,
LabelPoint = chartPoint => loggerData.Labels[(int)chartPoint.X].ToString(),
Tag = bandIndex,
Title = bandIndex.ToString()
});

注意，chartPoint.X是特定点(在X中)的(从零开始的)索引—而chartPoint.Y是该点的y值(也用于XAML)。使用这个索引，我可以在我的名称列表中查找loggerData.Labels，并返回与该索引关联的时间戳。