WinForms Data Grid - Display editors in a group row to edit cell values in the group

This example demonstrates how to display column editors in group rows. The user can use the editor to specify the same value for all cells in a column in a group.

You can also enable the GroupEditProvider.ShowGroupEditorOnMouseHover option to automatically invoke the group editor on mouse hover.

C#
provider = new GroupEditProvider(gridView1);  
provider.ShowGroupEditorOnMouseHover = true;  
provider.SingleClick = true;  
provider.EnableGroupEditing();

Files to Review

GroupEditProvider.cs (VB: GroupEditProvider.vb)
Main.cs (VB: Main.vb)

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Example Code

WindowsApplication3/GroupEditProvider.cs(vb)

C#
VB.NET

C#
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using DevExpress.Skins;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using DevExpress.Utils;
using DevExpress.XtraGrid.Columns;
using System.Drawing;
using System.Collections;
using DevExpress.XtraEditors;
using DevExpress.XtraGrid.Drawing;
using DevExpress.XtraEditors.Repository;
using DevExpress.XtraEditors.Drawing;
using DevExpress.XtraEditors.ViewInfo;

namespace DXSample {
    public class GroupEditProvider
    {
        GridView view;
        Dictionary<Type, BaseEdit> editors;
        Dictionary<Type, BaseEditPainter> painters;
        Dictionary<Type, BaseEditViewInfo> info;
        Rectangle hotTrackRectangle;
        BaseEdit groupEdit;
        bool showGroupEditorOnMouseHover = false;
        bool singleClick = false;

        public GroupEditProvider(GridView view)
        {
            this.view = view;
            painters = new Dictionary<Type, BaseEditPainter>();
            editors = new Dictionary<Type, BaseEdit>();
            info = new Dictionary<Type, BaseEditViewInfo>();
            hotTrackRectangle = Rectangle.Empty;
        }

        public bool ShowGroupEditorOnMouseHover
        {
            get { return showGroupEditorOnMouseHover; }
            set
            {
                if (showGroupEditorOnMouseHover != value)
                    showGroupEditorOnMouseHover = value;
            }
        }

        public bool SingleClick
        {
            get { return singleClick; }
            set
            {
                if (singleClick != value)
                    singleClick = value;
            }
        }
           
        Rectangle HotTrackRectangle
        {
            get { return hotTrackRectangle; }
            set
            {
                if (hotTrackRectangle == value)
                    return;
                view.InvalidateRect(hotTrackRectangle);
                view.InvalidateRect(value);
                hotTrackRectangle = value;
            }
        }

        public void EnableGroupEditing()
        {
            view.CustomDrawGroupRow += OnCustomDrawGroupRow;
            view.MouseDown += OnMouseDown;
            view.MouseMove += OnMouseMove;
            view.TopRowChanged += OnTopRowChanged;
            view.GridControl.Resize += OnGridControlResize;
        }

        void OnGridControlResize(object sender, EventArgs e)
        {
            HideGroupEditor(groupEdit, false);
        }

        void OnTopRowChanged(object sender, EventArgs e)
        {
            HideGroupEditor(groupEdit, false);
        }

       
        void OnMouseMove(object sender, MouseEventArgs e)
        {
            GridHitInfo hitInfo = view.CalcHitInfo(e.Location);
            if (hitInfo.HitTest == GridHitTest.Row && view.IsGroupRow(hitInfo.RowHandle))
            {
                GridViewInfo viewInfo = view.GetViewInfo() as GridViewInfo;
                GridGroupRowInfo rowInfo = viewInfo.GetGridRowInfo(hitInfo.RowHandle) as GridGroupRowInfo;
                GridColumn col = viewInfo.GetNearestColumn(e.Location);
                GridColumnInfoArgs args = viewInfo.ColumnsInfo[col];
                if (col.VisibleIndex == 0)
                    HotTrackRectangle = new Rectangle(rowInfo.ButtonBounds.Right + 2, rowInfo.Bounds.Y,
                        args.Bounds.Width + args.Bounds.X - rowInfo.ButtonBounds.Right - 2, rowInfo.Bounds.Height);
                else
                    HotTrackRectangle = new Rectangle(args.Bounds.X + 2, rowInfo.Bounds.Y,
                        args.Bounds.Width - 2, rowInfo.Bounds.Height);
            }
            else
                HotTrackRectangle = Rectangle.Empty;
        }

        void OnMouseDown(object sender, MouseEventArgs e)
        {
            GridHitInfo hitInfo = view.CalcHitInfo(e.Location);
            if (e.Button == MouseButtons.Left && HotTrackRectangle.Contains(e.Location))
            {
                if ((SingleClick && e.Clicks == 1) || (!SingleClick && e.Clicks == 2))
                {
                    view.FocusedRowHandle = hitInfo.RowHandle;
                    GridViewInfo viewInfo = view.GetViewInfo() as GridViewInfo;
                    GridColumn col = viewInfo.GetNearestColumn(e.Location);
                    ShowGroupEditor(col);
                    DXMouseEventArgs.GetMouseArgs(e).Handled = true;
                }
            }
        }

        private void ShowGroupEditor(GridColumn column)
        {
            groupEdit = GetGroupEditor(column);
            groupEdit.Visible = true;
            groupEdit.Bounds = HotTrackRectangle;
            groupEdit.Tag = column.FieldName;
            groupEdit.Select();
        }

        private BaseEdit GetGroupEditor(GridColumn column)
        {
            Type editorType = column.RealColumnEdit.GetType();
            if (editors.ContainsKey(editorType)) return editors[editorType];
            BaseEdit groupEdit = column.RealColumnEdit.CreateEditor();
            groupEdit.Parent = view.GridControl;
            if (groupEdit is CheckEdit)
                (groupEdit as CheckEdit).Properties.GlyphAlignment = HorzAlignment.Center;
            groupEdit.KeyDown += OnGroupEditKeyDown;
            groupEdit.Validated += OnGroupEditValidated;
            editors.Add(editorType, groupEdit);
            return groupEdit;
        }

        void OnGroupEditKeyDown(object sender, KeyEventArgs e)
        {
            BaseEdit edit = sender as BaseEdit;
            if (e.KeyData == Keys.Enter)
            {
                HideGroupEditor(edit, true);
                e.Handled = true;
            }
            if (e.KeyData == Keys.Escape)
            {
                HideGroupEditor(edit, false);
                e.Handled = true;
            }
        }

        private void HideGroupEditor(BaseEdit edit, bool updateValues)
        {
            if (edit == null || !edit.Visible) return;
            if (edit.IsModified && edit.EditValue != null && updateValues)
                SetChildRowValues(edit);
            edit.EditValue = null;
            edit.Visible = false;
        }

        void OnGroupEditValidated(object sender, EventArgs e)
        {
            BaseEdit edit = sender as BaseEdit;
            HideGroupEditor(edit, true);
        }

        private void SetChildRowValues(BaseEdit edit)
        {
            int groupRowHandle = view.FocusedRowHandle;
            int childRowCount = view.GetChildRowCount(groupRowHandle);
            string fieldName = edit.Tag.ToString();
            for (int i = 0; i < childRowCount; i++)
            {
                int childRowHandle = view.GetChildRowHandle(groupRowHandle, i);
                view.SetRowCellValue(childRowHandle, fieldName, edit.EditValue);
            }
        }

        void OnCustomDrawGroupRow(object sender, DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs e)
        {
            if (ShowGroupEditorOnMouseHover && HotTrackRectangle != Rectangle.Empty 
                && e.Info.Bounds.Contains(HotTrackRectangle.Location)) {
                DrawGroupRow(e);
                DrawGroupEditor(e); 
                e.Handled = true;
            }
        }

        private void DrawGroupEditor(DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs e)
        {
            GridViewInfo viewInfo = view.GetViewInfo() as GridViewInfo;
            GridColumn col = viewInfo.GetNearestColumn(HotTrackRectangle.Location);
            BaseEditPainter groupEditPainter = GetGroupEditPainter(col);
            BaseEditViewInfo editViewInfo = GetGroupEditViewInfo(col);
            editViewInfo.Bounds = HotTrackRectangle;
            editViewInfo.CalcViewInfo(e.Graphics);
            e.Cache.FillRectangle(viewInfo.PaintAppearance.Row.GetBackBrush(e.Cache), HotTrackRectangle);
            groupEditPainter.Draw(new ControlGraphicsInfoArgs(editViewInfo, e.Cache, HotTrackRectangle));
        }

        private void DrawGroupRow(DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs e)
        {
            e.Appearance.FillRectangle(e.Cache, e.Bounds);
            e.Painter.DrawObject(e.Info);
        }

        private BaseEditPainter GetGroupEditPainter(GridColumn col)
        {
            Type editorType = col.RealColumnEdit.GetType();
            if (painters.ContainsKey(editorType)) return painters[editorType];
            painters.Add(editorType, col.RealColumnEdit.CreatePainter());
            return painters[editorType];
        }

        private BaseEditViewInfo GetGroupEditViewInfo(GridColumn col)
        {
            Type editorType = col.RealColumnEdit.GetType();
            if (info.ContainsKey(editorType)) return info[editorType];
            info.Add(editorType, col.RealColumnEdit.CreateViewInfo());
            return info[editorType]; 
        }

        public void DisableGroupEditing(){
            foreach (BaseEdit edit in editors.Values)
            {
                edit.Parent = null;
                edit.Validated -= OnGroupEditValidated;
                edit.KeyDown -= OnGroupEditKeyDown;
                edit.Dispose();
            }
            hotTrackRectangle = Rectangle.Empty;
            editors.Clear();
            painters.Clear();
            info.Clear();
            view.CustomDrawGroupRow -= OnCustomDrawGroupRow;
            view.MouseDown -= OnMouseDown;
            view.MouseMove -= OnMouseMove;
            view.TopRowChanged -= OnTopRowChanged;
            view.GridControl.Resize -= OnGridControlResize;
        }
    }
}

Visual Basic
Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports DevExpress.Skins
Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Grid.ViewInfo
Imports DevExpress.Utils
Imports DevExpress.XtraGrid.Columns
Imports System.Drawing
Imports System.Collections
Imports DevExpress.XtraEditors
Imports DevExpress.XtraGrid.Drawing
Imports DevExpress.XtraEditors.Repository
Imports DevExpress.XtraEditors.Drawing
Imports DevExpress.XtraEditors.ViewInfo

Namespace DXSample
    Public Class GroupEditProvider
        Private view As GridView
        Private editors As Dictionary(Of Type, BaseEdit)
        Private painters As Dictionary(Of Type, BaseEditPainter)
        Private info As Dictionary(Of Type, BaseEditViewInfo)
'INSTANT VB NOTE: The variable hotTrackRectangle was renamed since Visual Basic does not allow variables and other class members to have the same name:
        Private hotTrackRectangle_Renamed As Rectangle
        Private groupEdit As BaseEdit
'INSTANT VB NOTE: The variable showGroupEditorOnMouseHover was renamed since Visual Basic does not allow variables and other class members to have the same name:
        Private showGroupEditorOnMouseHover_Renamed As Boolean = False
'INSTANT VB NOTE: The variable singleClick was renamed since Visual Basic does not allow variables and other class members to have the same name:
        Private singleClick_Renamed As Boolean = False

        Public Sub New(ByVal view As GridView)
            Me.view = view
            painters = New Dictionary(Of Type, BaseEditPainter)()
            editors = New Dictionary(Of Type, BaseEdit)()
            info = New Dictionary(Of Type, BaseEditViewInfo)()
            hotTrackRectangle_Renamed = Rectangle.Empty
        End Sub

        Public Property ShowGroupEditorOnMouseHover() As Boolean
            Get
                Return showGroupEditorOnMouseHover_Renamed
            End Get
            Set(ByVal value As Boolean)
                If showGroupEditorOnMouseHover_Renamed <> value Then
                    showGroupEditorOnMouseHover_Renamed = value
                End If
            End Set
        End Property

        Public Property SingleClick() As Boolean
            Get
                Return singleClick_Renamed
            End Get
            Set(ByVal value As Boolean)
                If singleClick_Renamed <> value Then
                    singleClick_Renamed = value
                End If
            End Set
        End Property

        Private Property HotTrackRectangle() As Rectangle
            Get
                Return hotTrackRectangle_Renamed
            End Get
            Set(ByVal value As Rectangle)
                If hotTrackRectangle_Renamed = value Then
                    Return
                End If
                view.InvalidateRect(hotTrackRectangle_Renamed)
                view.InvalidateRect(value)
                hotTrackRectangle_Renamed = value
            End Set
        End Property

        Public Sub EnableGroupEditing()
            AddHandler view.CustomDrawGroupRow, AddressOf OnCustomDrawGroupRow
            AddHandler view.MouseDown, AddressOf OnMouseDown
            AddHandler view.MouseMove, AddressOf OnMouseMove
            AddHandler view.TopRowChanged, AddressOf OnTopRowChanged
            AddHandler view.GridControl.Resize, AddressOf OnGridControlResize
        End Sub

        Private Sub OnGridControlResize(ByVal sender As Object, ByVal e As EventArgs)
            HideGroupEditor(groupEdit, False)
        End Sub

        Private Sub OnTopRowChanged(ByVal sender As Object, ByVal e As EventArgs)
            HideGroupEditor(groupEdit, False)
        End Sub


        Private Sub OnMouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
            Dim hitInfo As GridHitInfo = view.CalcHitInfo(e.Location)
            If hitInfo.HitTest = GridHitTest.Row AndAlso view.IsGroupRow(hitInfo.RowHandle) Then
                Dim viewInfo As GridViewInfo = TryCast(view.GetViewInfo(), GridViewInfo)
                Dim rowInfo As GridGroupRowInfo = TryCast(viewInfo.GetGridRowInfo(hitInfo.RowHandle), GridGroupRowInfo)
                Dim col As GridColumn = viewInfo.GetNearestColumn(e.Location)
                Dim args As GridColumnInfoArgs = viewInfo.ColumnsInfo(col)
                If col.VisibleIndex = 0 Then
                    HotTrackRectangle = New Rectangle(rowInfo.ButtonBounds.Right + 2, rowInfo.Bounds.Y, args.Bounds.Width + args.Bounds.X - rowInfo.ButtonBounds.Right - 2, rowInfo.Bounds.Height)
                Else
                    HotTrackRectangle = New Rectangle(args.Bounds.X + 2, rowInfo.Bounds.Y, args.Bounds.Width - 2, rowInfo.Bounds.Height)
                End If
            Else
                HotTrackRectangle = Rectangle.Empty
            End If
        End Sub

        Private Sub OnMouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
            Dim hitInfo As GridHitInfo = view.CalcHitInfo(e.Location)
            If e.Button = MouseButtons.Left AndAlso HotTrackRectangle.Contains(e.Location) Then
                If (SingleClick AndAlso e.Clicks = 1) OrElse ((Not SingleClick) AndAlso e.Clicks = 2) Then
                    view.FocusedRowHandle = hitInfo.RowHandle
                    Dim viewInfo As GridViewInfo = TryCast(view.GetViewInfo(), GridViewInfo)
                    Dim col As GridColumn = viewInfo.GetNearestColumn(e.Location)
                    ShowGroupEditor(col)
                    DXMouseEventArgs.GetMouseArgs(e).Handled = True
                End If
            End If
        End Sub

        Private Sub ShowGroupEditor(ByVal column As GridColumn)
            groupEdit = GetGroupEditor(column)
            groupEdit.Visible = True
            groupEdit.Bounds = HotTrackRectangle
            groupEdit.Tag = column.FieldName
            groupEdit.Select()
        End Sub

        Private Function GetGroupEditor(ByVal column As GridColumn) As BaseEdit
            Dim editorType As Type = column.RealColumnEdit.GetType()
            If editors.ContainsKey(editorType) Then
                Return editors(editorType)
            End If
            Dim groupEdit As BaseEdit = column.RealColumnEdit.CreateEditor()
            groupEdit.Parent = view.GridControl
            If TypeOf groupEdit Is CheckEdit Then
                TryCast(groupEdit, CheckEdit).Properties.GlyphAlignment = HorzAlignment.Center
            End If
            AddHandler groupEdit.KeyDown, AddressOf OnGroupEditKeyDown
            AddHandler groupEdit.Validated, AddressOf OnGroupEditValidated
            editors.Add(editorType, groupEdit)
            Return groupEdit
        End Function

        Private Sub OnGroupEditKeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
            Dim edit As BaseEdit = TryCast(sender, BaseEdit)
            If e.KeyData = Keys.Enter Then
                HideGroupEditor(edit, True)
                e.Handled = True
            End If
            If e.KeyData = Keys.Escape Then
                HideGroupEditor(edit, False)
                e.Handled = True
            End If
        End Sub

        Private Sub HideGroupEditor(ByVal edit As BaseEdit, ByVal updateValues As Boolean)
            If edit Is Nothing OrElse (Not edit.Visible) Then
                Return
            End If
            If edit.IsModified AndAlso edit.EditValue IsNot Nothing AndAlso updateValues Then
                SetChildRowValues(edit)
            End If
            edit.EditValue = Nothing
            edit.Visible = False
        End Sub

        Private Sub OnGroupEditValidated(ByVal sender As Object, ByVal e As EventArgs)
            Dim edit As BaseEdit = TryCast(sender, BaseEdit)
            HideGroupEditor(edit, True)
        End Sub

        Private Sub SetChildRowValues(ByVal edit As BaseEdit)
            Dim groupRowHandle As Integer = view.FocusedRowHandle
            Dim childRowCount As Integer = view.GetChildRowCount(groupRowHandle)
            Dim fieldName As String = edit.Tag.ToString()
            For i As Integer = 0 To childRowCount - 1
                Dim childRowHandle As Integer = view.GetChildRowHandle(groupRowHandle, i)
                view.SetRowCellValue(childRowHandle, fieldName, edit.EditValue)
            Next i
        End Sub

        Private Sub OnCustomDrawGroupRow(ByVal sender As Object, ByVal e As DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs)
            If ShowGroupEditorOnMouseHover AndAlso HotTrackRectangle <> Rectangle.Empty AndAlso e.Info.Bounds.Contains(HotTrackRectangle.Location) Then
                DrawGroupRow(e)
                DrawGroupEditor(e)
                e.Handled = True
            End If
        End Sub

        Private Sub DrawGroupEditor(ByVal e As DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs)
            Dim viewInfo As GridViewInfo = TryCast(view.GetViewInfo(), GridViewInfo)
            Dim col As GridColumn = viewInfo.GetNearestColumn(HotTrackRectangle.Location)
            Dim groupEditPainter As BaseEditPainter = GetGroupEditPainter(col)
            Dim editViewInfo As BaseEditViewInfo = GetGroupEditViewInfo(col)
            editViewInfo.Bounds = HotTrackRectangle
            editViewInfo.CalcViewInfo(e.Graphics)
            e.Cache.FillRectangle(viewInfo.PaintAppearance.Row.GetBackBrush(e.Cache), HotTrackRectangle)
            groupEditPainter.Draw(New ControlGraphicsInfoArgs(editViewInfo, e.Cache, HotTrackRectangle))
        End Sub

        Private Sub DrawGroupRow(ByVal e As DevExpress.XtraGrid.Views.Base.RowObjectCustomDrawEventArgs)
            e.Appearance.FillRectangle(e.Cache, e.Bounds)
            e.Painter.DrawObject(e.Info)
        End Sub

        Private Function GetGroupEditPainter(ByVal col As GridColumn) As BaseEditPainter
            Dim editorType As Type = col.RealColumnEdit.GetType()
            If painters.ContainsKey(editorType) Then
                Return painters(editorType)
            End If
            painters.Add(editorType, col.RealColumnEdit.CreatePainter())
            Return painters(editorType)
        End Function

        Private Function GetGroupEditViewInfo(ByVal col As GridColumn) As BaseEditViewInfo
            Dim editorType As Type = col.RealColumnEdit.GetType()
            If info.ContainsKey(editorType) Then
                Return info(editorType)
            End If
            info.Add(editorType, col.RealColumnEdit.CreateViewInfo())
            Return info(editorType)
        End Function

        Public Sub DisableGroupEditing()
            For Each edit As BaseEdit In editors.Values
                edit.Parent = Nothing
                RemoveHandler edit.Validated, AddressOf OnGroupEditValidated
                RemoveHandler edit.KeyDown, AddressOf OnGroupEditKeyDown
                edit.Dispose()
            Next edit
            hotTrackRectangle_Renamed = Rectangle.Empty
            editors.Clear()
            painters.Clear()
            info.Clear()
            RemoveHandler view.CustomDrawGroupRow, AddressOf OnCustomDrawGroupRow
            RemoveHandler view.MouseDown, AddressOf OnMouseDown
            RemoveHandler view.MouseMove, AddressOf OnMouseMove
            RemoveHandler view.TopRowChanged, AddressOf OnTopRowChanged
            RemoveHandler view.GridControl.Resize, AddressOf OnGridControlResize
        End Sub
    End Class
End Namespace

WindowsApplication3/Main.cs(vb)

C#
VB.NET

C#
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraEditors;


namespace DXSample {
    public partial class Main: XtraForm {
        public Main() {
            InitializeComponent();
        }

        GroupEditProvider provider;
        private void OnLoad(object sender, EventArgs e) {
            // TODO: This line of code loads data into the 'nwindDataSet.Products' table. You can move, or remove it, as needed.
            this.productsTableAdapter.Fill(this.nwindDataSet.Products);
            provider = new GroupEditProvider(gridView1);
            provider.ShowGroupEditorOnMouseHover = true;
            provider.SingleClick = true;
            provider.EnableGroupEditing();
        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            provider.DisableGroupEditing();
            base.OnFormClosing(e);
        }
    }
}

Visual Basic
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports DevExpress.XtraEditors


Namespace DXSample
    Partial Public Class Main
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
        End Sub

        Private provider As GroupEditProvider
        Private Overloads Sub OnLoad(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
            ' TODO: This line of code loads data into the 'nwindDataSet.Products' table. You can move, or remove it, as needed.
            Me.productsTableAdapter.Fill(Me.nwindDataSet.Products)
            provider = New GroupEditProvider(gridView1)
            provider.ShowGroupEditorOnMouseHover = True
            provider.SingleClick = True
            provider.EnableGroupEditing()
        End Sub

        Protected Overrides Sub OnFormClosing(ByVal e As FormClosingEventArgs)
            provider.DisableGroupEditing()
            MyBase.OnFormClosing(e)
        End Sub
    End Class
End Namespace

DevExpress Support Team

last modified 2 years ago

Modified: September 16, 2023 10:20 AM

Platform: WinForms

Product: XtraGrid Suite

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WinForms Data Grid - Display editors in a group row to edit cell values in the group

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Example Code

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