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| using System;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApp2
{
public partial class Form1_Import : Form
{
string[] strArray = new string[] { "Mahesh Chand", "Mike Gold", "Raj Beniwal", "Praveen Kumar", "Dinesh Beniwal" };
public Form1_Import()
{
InitializeComponent();
dataGridView2.AutoGenerateColumns = true;
dataGridView2.RowTemplate.Height = 45;
CalendarColumn calendar = new CalendarColumn();
calendar.HeaderText = "Calendar";
calendar.Name = "Calendar";
calendar.Width = 100;
this.dataGridView2.Columns.Add(calendar);
CustomComboBoxColumn dgvcomboCustom = new CustomComboBoxColumn();
dgvcomboCustom.HeaderText = "Custom";
dgvcomboCustom.Name = "Custom";
dgvcomboCustom.Width = 150;
dgvcomboCustom.DataSource = strArray;
dataGridView2.Columns.Add(dgvcomboCustom);
DataGridViewComboBoxColumn dgvcomboRegular = new DataGridViewComboBoxColumn();
dgvcomboRegular.Items.Add("Item1 regular");
dgvcomboRegular.Items.Add("Item2 regular");
dgvcomboRegular.HeaderText = "Regular";
dgvcomboRegular.Name = "Regular";
dgvcomboRegular.Width = 100;
dataGridView2.Columns.Add(dgvcomboRegular);
}
}
#region Custom Combobox which content is cleared on loosin focus
public partial class CustomComboBox : ComboBox
{
public CustomComboBox()
{
ItemHeight = 26;
DropDownHeight = ItemHeight * 6;
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
if ((e.Index >= 0))
{
e.DrawBackground();
e.DrawFocusRectangle();
using (SolidBrush b = new SolidBrush(ForeColor))
{
//ComboBox combo = sender as ComboBox;
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
e.Graphics.FillRectangle(new SolidBrush(Color.Beige), e.Bounds);
else
e.Graphics.FillRectangle(new SolidBrush(BackColor), e.Bounds);
string name = Items[e.Index].ToString();
Int32 textLeft = e.Bounds.Left + 3;
Int32 textTop = e.Bounds.Top + (e.Bounds.Height / 2) - (Font.Height / 2);
Int32 textWidth = e.Bounds.Width - e.Bounds.Width;
Int32 textHeight = e.Bounds.Height;
Rectangle textTarget = new Rectangle(textLeft, textTop, textWidth, textHeight);
e.Graphics.DrawString(name, Font, b, textTarget);
}
}
}
}
class CustomComboBoxEditControl : CustomComboBox, IDataGridViewEditingControl
{
DataGridView dataGridView;
private bool valueChanged = false;
int rowIndex;
public CustomComboBoxEditControl() : base()
{
Console.WriteLine("CustomComboBoxEditControl");
EditingControlFormattedValue = false;
DropDownStyle = ComboBoxStyle.DropDownList;
DrawMode = DrawMode.OwnerDrawFixed;
}
protected override void OnLostFocus(EventArgs e)
{
Console.WriteLine("OnLostFocus");
}
// Implements the IDataGridViewEditingControl.EditingControlFormattedValue
// property.
public object EditingControlFormattedValue
{
get { return SelectedItem; }
set { SelectedItem = value; }
}
// Implements the
// IDataGridViewEditingControl.GetEditingControlFormattedValue method.
public object GetEditingControlFormattedValue( DataGridViewDataErrorContexts context )
{
return EditingControlFormattedValue;
}
// Implements the
// IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
Font = dataGridViewCellStyle.Font;
ForeColor = dataGridViewCellStyle.ForeColor;
BackColor = dataGridViewCellStyle.BackColor;
}
// Implements the IDataGridViewEditingControl.EditingControlRowIndex
// property.
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
}
// Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
// method.
public bool EditingControlWantsInputKey(
Keys key, bool dataGridViewWantsInputKey)
{
// Let the DateTimePicker handle the keys listed.
switch (key & Keys.KeyCode)
{
case Keys.Left:
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Home:
case Keys.End:
case Keys.PageDown:
case Keys.PageUp:
case Keys.Tab:
return true;
default:
return !dataGridViewWantsInputKey;
}
}
// Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
// method.
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
}
// Implements the IDataGridViewEditingControl
// .RepositionEditingControlOnValueChange property.
public bool RepositionEditingControlOnValueChange
{
get { return false; }
}
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlValueChanged property.
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingPanelCursor property.
public Cursor EditingPanelCursor
{
get { return base.Cursor; }
}
}
public class CustomComboBoxColumn : DataGridViewColumn
{
public CustomComboBoxColumn() : base (new CustomComboBoxCell()) {}
public object DataSource { get; set; }
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
Type targetType = typeof(CustomComboBoxCell);
// Ensure that the cell used for the template is a CustomComboBoxCell.
if ((!(value == null) && !value.GetType().IsAssignableFrom(targetType)))
{
string errorMessage = $"CellTemplate must be of the type {targetType}.";
throw new InvalidCastException(errorMessage);
}
base.CellTemplate = value;
}
}
public override object Clone()
{
CustomComboBoxColumn retVal = (CustomComboBoxColumn)base.Clone();
retVal.DataSource = this.DataSource;
return retVal;
}
}
public class CustomComboBoxCell : DataGridViewTextBoxCell
{
string strElement;
string strDefault;
public CustomComboBoxCell() : base()
{
}
public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
// Set the value of the editing control to the current cell value.
base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
CustomComboBoxEditControl ctl = (CustomComboBoxEditControl)DataGridView.EditingControl;
CustomComboBoxColumn col = (CustomComboBoxColumn)DataGridView.Columns[DataGridView.CurrentCell.ColumnIndex];
DataGridViewRow row = (DataGridViewRow)DataGridView.Rows[DataGridView.CurrentCell.RowIndex];
string[] strArray = (string[])col.DataSource;
strElement = strArray[0];
ctl.DataSource = col.DataSource;
ctl.Height = DataGridView.RowTemplate.Height;
ctl.ItemHeight = row.Height - 6;
// Use the default row value when Value property is null.
if ((this.Value == null || this.Value == DBNull.Value))
ctl.Text = (string)this.DefaultNewRowValue;
else
ctl.Text = (string)this.Value;
}
public override Type EditType
{
get { return typeof(CustomComboBoxEditControl); }
}
public override Type FormattedValueType
{
get
{
return typeof(string);
}
}
public override Type ValueType
{
get
{
return typeof(string);
}
}
public override object DefaultNewRowValue
{
get
{
return string.Empty;
}
}
protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
{
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
graphics.FillRectangle(new SolidBrush(cellStyle.BackColor), cellBounds);
string valueString = Convert.ToString(value);
Brush b = new SolidBrush(cellStyle.ForeColor);
Int32 textLeft = cellBounds.Left + 6;
Int32 textTop = cellBounds.Top + (cellBounds.Height / 2) - (cellStyle.Font.Height / 2);
Int32 textWidth = cellBounds.Width - cellBounds.Width;
Int32 textHeight = cellBounds.Height;
Rectangle textTarget = new Rectangle(textLeft, textTop, textWidth, textHeight);
graphics.DrawString(valueString, cellStyle.Font, b, textTarget);
}
}
#endregion
#region Calendar
public class CalendarColumn : DataGridViewColumn
{
public CalendarColumn() : base(new CalendarCell())
{
}
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
// Ensure that the cell used for the template is a CalendarCell.
if (value != null &&
!value.GetType().IsAssignableFrom(typeof(CalendarCell)))
{
throw new InvalidCastException("Must be a CalendarCell");
}
base.CellTemplate = value;
}
}
}
public class CalendarCell : DataGridViewTextBoxCell
{
public CalendarCell()
: base()
{
// Use the short date format.
this.Style.Format = "d";
}
public override void InitializeEditingControl(int rowIndex, object
initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
// Set the value of the editing control to the current cell value.
base.InitializeEditingControl(rowIndex, initialFormattedValue,
dataGridViewCellStyle);
CalendarEditingControl ctl =
DataGridView.EditingControl as CalendarEditingControl;
// Use the default row value when Value property is null.
if (this.Value == null)
{
ctl.Value = (DateTime)this.DefaultNewRowValue;
}
else
{
ctl.Value = (DateTime)this.Value;
}
}
public override Type EditType
{
get
{
// Return the type of the editing control that CalendarCell uses.
return typeof(CalendarEditingControl);
}
}
public override Type ValueType
{
get
{
// Return the type of the value that CalendarCell contains.
return typeof(DateTime);
}
}
public override object DefaultNewRowValue
{
get
{
// Use the current date and time as the default value.
return DateTime.Now;
}
}
}
class CalendarEditingControl : DateTimePicker, IDataGridViewEditingControl
{
DataGridView dataGridView;
private bool valueChanged = false;
int rowIndex;
public CalendarEditingControl()
{
this.Format = DateTimePickerFormat.Short;
}
// Implements the IDataGridViewEditingControl.EditingControlFormattedValue
// property.
public object EditingControlFormattedValue
{
get
{
return this.Value.ToShortDateString();
}
set
{
if (value is String)
{
try
{
// This will throw an exception of the string is
// null, empty, or not in the format of a date.
this.Value = DateTime.Parse((String)value);
}
catch
{
// In the case of an exception, just use the
// default value so we're not left with a null
// value.
this.Value = DateTime.Now;
}
}
}
}
// Implements the
// IDataGridViewEditingControl.GetEditingControlFormattedValue method.
public object GetEditingControlFormattedValue(
DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
}
// Implements the
// IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
public void ApplyCellStyleToEditingControl(
DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
this.CalendarMonthBackground = dataGridViewCellStyle.BackColor;
}
// Implements the IDataGridViewEditingControl.EditingControlRowIndex
// property.
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
}
// Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
// method.
public bool EditingControlWantsInputKey(
Keys key, bool dataGridViewWantsInputKey)
{
// Let the DateTimePicker handle the keys listed.
switch (key & Keys.KeyCode)
{
case Keys.Left:
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Home:
case Keys.End:
case Keys.PageDown:
case Keys.PageUp:
return true;
default:
return !dataGridViewWantsInputKey;
}
}
// Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
// method.
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
}
// Implements the IDataGridViewEditingControl
// .RepositionEditingControlOnValueChange property.
public bool RepositionEditingControlOnValueChange
{
get
{
return false;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlDataGridView property.
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlValueChanged property.
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingPanelCursor property.
public Cursor EditingPanelCursor
{
get
{
return base.Cursor;
}
}
protected override void OnValueChanged(EventArgs eventargs)
{
// Notify the DataGridView that the contents of the cell
// have changed.
valueChanged = true;
this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
base.OnValueChanged(eventargs);
}
}
#endregion
} |
Custom combo box est mise à jour lorsqu'elle reçoit le focus mais disparaît lorsqu'elle le perd.
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