public DataGridCellEditingCancelEventArgs(DataGridColumnBase dataGridColumn,
DataGridRow dataGridRow,
Control element,
DataGridEditingTriggerInfo editingTriggerInfo) : base(dataGridColumn, dataGridRow, element)
{
this.EditingTriggerInfo = editingTriggerInfo;
}
public override object PrepareCellEdit(DataGridEditingTriggerInfo editingTriggerInfo)
{
if (this._editingCheckBox != null)
{
bool?uneditedValue = this._editingCheckBox.IsChecked;
if (editingTriggerInfo != null &&
editingTriggerInfo.MouseButtonEventArgs != null)
{
// Editing was triggered by a mouse click
FrameworkElement checkBox = editingTriggerInfo.MouseButtonEventArgs.Source as FrameworkElement;
while (checkBox != null && !(checkBox is CheckBox))
{
checkBox = checkBox.Parent as FrameworkElement;
}
if (checkBox != null)
{
// User clicked the checkbox itself, let's toggle the IsChecked value
if (this._editingCheckBox.IsThreeState)
{
switch (this._editingCheckBox.IsChecked)
{
case false:
this._editingCheckBox.IsChecked = true;
break;
case true:
this._editingCheckBox.IsChecked = null;
break;
case null:
this._editingCheckBox.IsChecked = false;
break;
}
}
else
{
this._editingCheckBox.IsChecked = !this._editingCheckBox.IsChecked;
}
}
}
return(uneditedValue);
}
return(false);
}
public override object PrepareCellEdit(DataGridEditingTriggerInfo editingTriggerInfo)
{
if (this._editingTextBox != null)
{
string uneditedText = this._editingTextBox.Text;
int len = uneditedText.Length;
if (editingTriggerInfo != null &&
editingTriggerInfo.KeyEventArgs != null &&
editingTriggerInfo.KeyEventArgs.Key == Key.F2)
{
// Put caret at the end of the text
this._editingTextBox.Select(len, len);
}
else
{
// Select all text
this._editingTextBox.Select(0, len);
}
return(uneditedText);
}
return(string.Empty);
}
private bool BeginCellEdit(DataGridEditingTriggerInfo editingTriggerInfo)
{
//
if (this.CurrentColumnIndex == -1 || !GetRowSelection(this.CurrentRowIndex))
{
//
return false;
}
Debug.Assert(this.CurrentColumnIndex >= 0);
Debug.Assert(this.CurrentColumnIndex < this.Columns.Count);
Debug.Assert(this.CurrentRowIndex >= -1);
Debug.Assert(this.CurrentRowIndex < this._rowCount);
Debug.Assert(this._editingRow == null || this.EditingRowIndex == this.CurrentRowIndex);
Debug.Assert(!GetColumnEffectiveReadOnlyState(this.CurrentColumn));
Debug.Assert(this.CurrentColumn.Visibility == Visibility.Visible);
if (this._editingColumnIndex != -1)
{
// Current cell is already in edit mode
Debug.Assert(this._editingColumnIndex == this.CurrentColumnIndex);
//
return true;
}
//
DataGridRow dataGridRow = this._editingRow;
if (dataGridRow == null)
{
if (IsRowDisplayed(this.CurrentRowIndex))
{
dataGridRow = GetDisplayedRow(this.CurrentRowIndex);
}
else
{
dataGridRow = GenerateRow(this.CurrentRowIndex);
}
}
Debug.Assert(dataGridRow != null);
DataGridCell dataGridCell = dataGridRow.Cells[this.CurrentColumnIndex];
DataGridCellEditingCancelEventArgs e = new DataGridCellEditingCancelEventArgs(this.CurrentColumn, dataGridRow, dataGridCell.Content as FrameworkElement, editingTriggerInfo);
OnBeginningCellEdit(e);
if (e.Cancel)
{
//
return false;
}
if (this._editingRow == null && !BeginRowEdit(dataGridRow))
{
//
return false;
}
Debug.Assert(this._editingRow != null);
Debug.Assert(this.EditingRowIndex == this.CurrentRowIndex);
this._editingColumnIndex = this.CurrentColumnIndex;
this._editingTriggerInfo = editingTriggerInfo;
this._editingRow.Cells[this.CurrentColumnIndex].ApplyCellState(true /*animate*/);
PopulateCellContent(false /*forceTemplating*/, true /*isCellEdited*/, this.CurrentColumn, dataGridRow, dataGridCell);
//
return true;
}
/// <summary>
/// Enters editing mode for the current cell and current row (if they're not already in editing mode).
/// </summary>
/// <param name="editingTriggerInfo">Provides information about the user gesture that caused the call to BeginEdit. Can be null.</param>
/// <returns>True if operation was successful. False otherwise.</returns>
public bool BeginEdit(DataGridEditingTriggerInfo editingTriggerInfo)
{
//
if (this.CurrentColumnIndex == -1 || !GetRowSelection(this.CurrentRowIndex))
{
//
return false;
}
Debug.Assert(this.CurrentColumnIndex >= 0);
Debug.Assert(this.CurrentColumnIndex < this.Columns.Count);
Debug.Assert(this.CurrentRowIndex >= -1);
Debug.Assert(this.CurrentRowIndex < this._rowCount);
Debug.Assert(this._editingRow == null || this.EditingRowIndex == this.CurrentRowIndex);
if (GetColumnEffectiveReadOnlyState(this.CurrentColumn))
{
// Current column is read-only
//
return false;
}
if (editingTriggerInfo != null)
{
editingTriggerInfo.ContainsFocus = this.ContainsFocus;
}
//
return BeginCellEdit(editingTriggerInfo);
}
public abstract object PrepareCellEdit(DataGridEditingTriggerInfo editingTriggerInfo);
public abstract object PrepareCellEdit(DataGridEditingTriggerInfo editingTriggerInfo);
public override object PrepareCellEdit(DataGridEditingTriggerInfo editingTriggerInfo)
{
if (this._editingCheckBox != null)
{
bool? uneditedValue = this._editingCheckBox.IsChecked;
if (editingTriggerInfo != null &&
editingTriggerInfo.MouseButtonEventArgs != null)
{
// Editing was triggered by a mouse click
FrameworkElement checkBox = editingTriggerInfo.MouseButtonEventArgs.Source as FrameworkElement;
while (checkBox != null && !(checkBox is CheckBox))
{
checkBox = checkBox.Parent as FrameworkElement;
}
if (checkBox != null)
{
// User clicked the checkbox itself, let's toggle the IsChecked value
if (this._editingCheckBox.IsThreeState)
{
switch (this._editingCheckBox.IsChecked)
{
case false:
this._editingCheckBox.IsChecked = true;
break;
case true:
this._editingCheckBox.IsChecked = null;
break;
case null:
this._editingCheckBox.IsChecked = false;
break;
}
}
else
{
this._editingCheckBox.IsChecked = !this._editingCheckBox.IsChecked;
}
}
}
return uneditedValue;
}
return false;
}
public override object PrepareCellEdit(DataGridEditingTriggerInfo editingTriggerInfo)
{
if (this._editingTextBox != null)
{
string uneditedText = this._editingTextBox.Text;
int len = uneditedText.Length;
if (editingTriggerInfo != null &&
editingTriggerInfo.KeyEventArgs != null &&
editingTriggerInfo.KeyEventArgs.Key == Key.F2)
{
// Put caret at the end of the text
this._editingTextBox.Select(len, len);
}
else
{
// Select all text
this._editingTextBox.Select(0, len);
}
return uneditedText;
}
return string.Empty;
}
