Hi.
I already invest time and money in doing so. Investigate this code:
(e-mail address removed)
using System;
using System.Drawing;
using System.Windows.Forms;
namespace RHSoft.UI {
/// <summary>
/// Esta coluna permite alternar entre várias imagens passadas por parametro
/// através de uma ImageList. A cada imagem faz corresponder um valor
/// na coluna de dados. Todos os valores possíveis serão tambem passados
/// por parâmetro no construtor da classe. A cada imagem na posição 'i' da
/// ImageList corresponderá o valor na posição 'i' do dito array de valores
/// possiveis. É de salientar que o array de valores possiveis deverá conter
/// o mesmo nº de valores que a lista de imagens da ImageList.
/// <seealso cref="DataGridImageColumn"/>
/// </summary>
public class DataGridImageSwitchColumn :
System.Windows.Forms.DataGridColumnStyle {
private System.Windows.Forms.ImageList imlImages;
private System.Collections.ArrayList arlValues;
private bool focused = false;
private KeyEventHandler handlerkeyDown = null;
private MouseEventHandler handlerMouseDown = null;
/// <summary>
/// Construtor que configura a coluna para alternar entre imagens passadas
/// por parâmetro através da ImageList
/// </summary>
public DataGridImageSwitchColumn(ImageList imlImages, object[] values) {
this.imlImages = imlImages;
arlValues = new System.Collections.ArrayList(values);
handlerkeyDown = new KeyEventHandler(dataGrid_KeyDown);
handlerMouseDown = new MouseEventHandler(dataGrid_MouseDown);
}
protected override void ConcedeFocus() {
base.ConcedeFocus();
Focused = false;
}
// initiates a request to complete an editing procedure.
protected override bool Commit(System.Windows.Forms.CurrencyManager source,
int rowNum) {
Focused = false;
return true;
}
protected override void Abort(int rowNum) {
}
// Prepares the cell for editing a value.
protected override void Edit(System.Windows.Forms.CurrencyManager source,
int rowNum, Rectangle bounds, bool readOnly) {
this.Edit(source, rowNum, bounds, readOnly, "", false);
}
// Prepares the cell for editing using the specified CurrencyManager, row
number, and Rectangle parameters.
protected override void Edit(System.Windows.Forms.CurrencyManager source,
int rowNum, Rectangle bounds, bool readOnly, string instantText) {
this.Edit(source, rowNum, bounds, readOnly, instantText, false);
}
protected override void Edit(System.Windows.Forms.CurrencyManager source,
int rowNum, Rectangle bounds, bool readOnly, string instantText, bool
cellIsVisible) {
Focused = cellIsVisible;
}
protected override int GetMinimumHeight() {
return 20;
}
protected override int GetPreferredHeight(Graphics g, object value) {
return this.DataGridTableStyle.PreferredRowHeight;
}
protected override Size GetPreferredSize(Graphics g, object value) {
return new Size(this.DataGridTableStyle.PreferredColumnWidth,
this.DataGridTableStyle.PreferredRowHeight);
}
protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager
source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight) {
try {
bool lfocused = rowNum == source.Position && focused;
g.SetClip(bounds);
g.FillRectangle(backBrush, bounds);
if (lfocused) {
System.Windows.Forms.ControlPaint.DrawFocusRectangle(g, bounds);
}
object data = this.GetColumnValueAtRow(source, rowNum);
if (data != System.DBNull.Value) {
int index = arlValues.IndexOf(data);
if (index >= 0) {
Image image = imlImages.Images[index];
//imlImages.Draw(g, bounds.X+((bounds.Width-image.Width)>>1),
bounds.Y+((bounds.Height-image.Height)>>1), index);
g.DrawImageUnscaled(image, bounds.X+((bounds.Width-image.Width)>>1),
bounds.Y+((bounds.Height-image.Height)>>1));
}
}
}
catch(Exception) {
}
finally {
g.ResetClip();
}
}
protected override void Paint(Graphics g, Rectangle bounds,
System.Windows.Forms.CurrencyManager source, int rowNum, bool alignToRight)
{
Paint(g, bounds, source, rowNum, new System.Drawing.SolidBrush(((rowNum % 2)
0) ? this.DataGridTableStyle.AlternatingBackColor :
this.DataGridTableStyle.BackColor),
System.Drawing.SystemBrushes.ControlText, alignToRight);
}
protected override void Paint(Graphics g, Rectangle bounds,
System.Windows.Forms.CurrencyManager source, int rowNum) {
Paint(g, bounds, source, rowNum, false);
}
protected override void SetDataGridInColumn(System.Windows.Forms.DataGrid
dataGrid) {
}
protected override void Dispose(bool disposing) {
base.Dispose(disposing);
if (disposing) {
this.Focused = false;
handlerkeyDown = null;
arlValues = null;
imlImages = null;
}
}
private bool Focused {
get {
return this.focused;
}
set {
if (this.focused == value) {
return;
}
this.focused = value;
if (this.DataGridTableStyle.DataGrid.CanFocus && !this.ReadOnly) {
if (value) {
this.DataGridTableStyle.DataGrid.KeyDown += handlerkeyDown;
this.DataGridTableStyle.DataGrid.MouseDown += handlerMouseDown;
this.DataGridTableStyle.DataGrid.Focus();
}
else {
this.DataGridTableStyle.DataGrid.KeyDown -= handlerkeyDown;
this.DataGridTableStyle.DataGrid.MouseDown -= handlerMouseDown;
}
}
}
}
/// <summary>
/// Alternância de valores, para a frente ou para trás
/// dependendo da tecla CONTROL.
/// </summary>
private void SwitchValue(int numRow) {
System.Windows.Forms.CurrencyManager cm =
(System.Windows.Forms.CurrencyManager)this.DataGridTableStyle.DataGrid.Bindi
ngContext[this.DataGridTableStyle.DataGrid.DataSource];
int index;
object value = this.GetColumnValueAtRow(cm, cm.Position);
if (numRow != cm.Position && numRow != int.MinValue) {
return;
}
if (value != null && (index = arlValues.IndexOf(value)) >= 0) {
if (Control.ModifierKeys == Keys.Control) {
index = (index == 0) ? (arlValues.Count-1) : (index - 1);
}
else {
index = (index == arlValues.Count-1) ? 0 : (index + 1);
}
}
else {
index = (Control.ModifierKeys == Keys.Control) ? (arlValues.Count-1) : 0;
}
this.SetColumnValueAtRow(cm, cm.Position, arlValues[index]);
this.Invalidate();
this.ColumnStartedEditing(this.DataGridTableStyle.DataGrid);
this.DataGridTableStyle.DataGrid.Focus();
}
private void dataGrid_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyCode == Keys.Space && !e.Alt) {
SwitchValue(int.MinValue);
}
}
private void dataGrid_MouseDown(object sender, MouseEventArgs e) {
if (e.Button == MouseButtons.Left) {
System.Windows.Forms.DataGrid.HitTestInfo hti =
this.DataGridTableStyle.DataGrid.HitTest(e.X, e.Y);
int columnIndex = this.DataGridTableStyle.GridColumnStyles.IndexOf(this);
if (hti.Column == columnIndex) {
SwitchValue(hti.Row);
}
hti = null;
}
}
}
}
