PivotGridField.PrintHeaderTemplateSelector Property

Gets or sets a template selector that chooses a print template for field headers based on custom logic. This is a dependency property.

Namespace: DevExpress.Xpf.PivotGrid

Assembly: DevExpress.Xpf.PivotGrid.v24.1.dll

NuGet Package: DevExpress.Wpf.PivotGrid

Declaration

C#

public DataTemplateSelector PrintHeaderTemplateSelector { get; set; }

VB.NET

Public Property PrintHeaderTemplateSelector As DataTemplateSelector

Property Value

Type	Description
DataTemplateSelector	A DataTemplateSelector descendant that chooses a template based on custom logic.

Remarks

A template that defines the presentation of the field header when the pivot grid is printed is specified by the PivotGridField.PrintHeaderTemplate property. If you have more than one template that can be used to render the field header, you can implement custom logic to choose the required template. To do this, derive from the DataTemplateSelector class, implement the SelectTemplate method that returns a template which meets the required condition, and assign an instance of this class to the PrintHeaderTemplateSelector property.

The PrintHeaderTemplateSelector is in effect only if the PivotGridField.PrintHeaderTemplate property is set to null (Nothing in Visual Basic). Otherwise, the PivotGridField.PrintHeaderTemplate template is used.

To learn more, see Printing and Exporting.

Example

This example demonstrates how to select print templates for the DXPivotGrid elements based on a custom logic.

The logic for selecting the data cell print template is based on the ratio of the data cell value to the grand total value. If the ratio is between 0.2 and 0.8, the template selector applies a template that highlights the cell text and adds the warning sign to the cell.

MainWindow.xaml.cs

using System;
using System.Windows;
using System.Windows.Controls;
using DevExpress.Xpf.PivotGrid;
using DevExpress.Xpf.Printing;

namespace DXPivotGrid_SelectingPrintTemplate {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            picotGridControl1.DataSource =
                new nwindDataSetTableAdapters.SalesPersonTableAdapter().GetData();
        }
        private void btnPrint_Click(object sender, RoutedEventArgs e) {
            PrintHelper.ShowPrintPreview(this, picotGridControl1);
        }
    }
    public class CellTemplateSelector : DataTemplateSelector {
        public override DataTemplate SelectTemplate(object item, DependencyObject container) {
            Window mainWindow = Application.Current.MainWindow;
            CellElementData cell = (CellElementData)item;
            // Calculate the ratio of the cell value to the grand total.
            double share = Convert.ToDouble(cell.Value) / Convert.ToDouble(cell.ColumnTotalValue);

            // Apply the Normal template to the Column Grand Total cells.
            if (cell.ColumnValue == null)
                return mainWindow.FindResource("NormalCellTemplate") as DataTemplate;

            // If the ratio is far from 0.5, use the Highlighted template.
            // Otherwise, use the Normal template.
            if (share > 0.8 || share < 0.2)
                return mainWindow.FindResource("HighlightedCellTemplate") as DataTemplate;
            else
                return mainWindow.FindResource("NormalCellTemplate") as DataTemplate;
        }
    }
}

MainWindow.xaml

<Window xmlns:dxpg="http://schemas.devexpress.com/winfx/2008/xaml/pivotgrid"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:local="clr-namespace:DXPivotGrid_SelectingPrintTemplate"
        x:Class="DXPivotGrid_SelectingPrintTemplate.MainWindow"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxp="http://schemas.devexpress.com/winfx/2008/xaml/printing"
        xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
        Title="MainWindow" Height="765" Width="485">
    <Window.Resources>
        <DataTemplate x:Key="NormalCellTemplate">
            <dxe:TextEdit Text="{Binding Path=Value, Mode=OneWay}"
                          IsPrintingMode="True" Padding="4,2"
                          dxp:TextExportSettings.Text="{Binding DisplayText, Mode=OneWay}"
                          dxp:TextExportSettings.TextValue="{Binding Value, Mode=OneWay}"
                          dxp:TextExportSettings.TextValueFormatString="{Binding ValueFormat, Mode=OneWay}"
                          dxp:TextExportSettings.XlsExportNativeFormat="{Binding UseNativeFormat, Mode=OneWay}"
                          VerticalContentAlignment="Center"
                          HorizontalContentAlignment="Right"
                          BorderThickness="{Binding Border, Mode=OneWay}"
                          BorderBrush="#808080"
                           />
        </DataTemplate>
        <DataTemplate x:Key="HighlightedCellTemplate">
            <Border dxp:ExportSettings.TargetType="Panel" Padding="4,2"
                    dxp:ExportSettings.BorderThickness="{Binding Border, Mode=OneWay}" 
                    dxp:ExportSettings.BorderColor="#808080" >
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <Image Margin="0,0,10,0" Source="Warning.png"
                           HorizontalAlignment="Right"
                           dxp:ExportSettings.TargetType="Image"
                           Grid.Column="0" />
                    <dxe:TextEdit Text="{Binding Path=Value, Mode=OneWay}" 
                              IsPrintingMode="True"
                              dxp:TextExportSettings.Text="{Binding DisplayText, Mode=OneWay}"
                              dxp:TextExportSettings.TextValue="{Binding Value, Mode=OneWay}"
                              dxp:TextExportSettings.TextValueFormatString="{Binding ValueFormat, Mode=OneWay}"
                              dxp:TextExportSettings.XlsExportNativeFormat="{Binding UseNativeFormat, Mode=OneWay}"
                              VerticalContentAlignment="Center"
                              HorizontalContentAlignment="Right"
                              FontStyle="Oblique"
                              Grid.Column="1" Foreground="Red" />
                </Grid>
            </Border>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <dxpg:PivotGridControl x:Name="picotGridControl1" PrintFieldCellTemplate="{x:Null}">
            <dxpg:PivotGridControl.Fields>
                <dxpg:PivotGridField Name="fieldCountry" FieldName="Country" Area="ColumnArea" />
                <dxpg:PivotGridField Name="fieldYear" FieldName="OrderDate" Area="RowArea"
                                     Caption="Year" GroupInterval="DateYear" />
                <dxpg:PivotGridField Name="fieldMonth" FieldName="OrderDate" Area="RowArea"
                                     Caption="Month" GroupInterval="DateMonth" />
                <dxpg:PivotGridField Name="fieldQuantity" FieldName="Quantity" Area="DataArea" />
            </dxpg:PivotGridControl.Fields>
            <dxpg:PivotGridControl.PrintFieldCellTemplateSelector>
                <local:CellTemplateSelector />
            </dxpg:PivotGridControl.PrintFieldCellTemplateSelector>
        </dxpg:PivotGridControl>
        <Button x:Name="btnPrint" Grid.Row="1" Content="Print Preview"
                Margin="5" Height="25" Width="200"
                Click="btnPrint_Click" />
    </Grid>
</Window>

MainWindow.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports DevExpress.Xpf.PivotGrid
Imports DevExpress.Xpf.Printing

Namespace DXPivotGrid_SelectingPrintTemplate
    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()
            picotGridControl1.DataSource = (New nwindDataSetTableAdapters.SalesPersonTableAdapter()).GetData()
        End Sub
        Private Sub btnPrint_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            PrintHelper.ShowPrintPreview(Me, picotGridControl1)
        End Sub
    End Class
    Public Class CellTemplateSelector
        Inherits DataTemplateSelector

        Public Overrides Function SelectTemplate(ByVal item As Object, ByVal container As DependencyObject) As DataTemplate
'INSTANT VB NOTE: The variable mainWindow was renamed since it may cause conflicts with calls to static members of the user-defined type with this name:
            Dim mainWindow_Renamed As Window = Application.Current.MainWindow
            Dim cell As CellElementData = DirectCast(item, CellElementData)
            ' Calculates the share of a cell value in the Column Grand Total value.
            Dim share As Double = Convert.ToDouble(cell.Value) / Convert.ToDouble(cell.ColumnTotalValue)

            ' Applies the Normal template to the Column Grand Total cells.
            If cell.ColumnValue Is Nothing Then
                Return TryCast(mainWindow_Renamed.FindResource("NormalCellTemplate"), DataTemplate)
            End If

            ' If the share is too far from 50%, the Highlighted template is selected.
            ' Otherwise, the Normal template is applied to the cell.
            If share > 0.8 OrElse share < 0.2 Then
                Return TryCast(mainWindow_Renamed.FindResource("HighlightedCellTemplate"), DataTemplate)
            Else
                Return TryCast(mainWindow_Renamed.FindResource("NormalCellTemplate"), DataTemplate)
            End If
        End Function
    End Class
End Namespace