/// <summary>
/// Gets the data context for the specified cell.
/// </summary>
/// <param name="owner">The owner.</param>
/// <param name="cell">The cell.</param>
/// <returns>The context object.</returns>
public object GetDataContext(DataGrid owner, CellRef cell)
{
var pd = owner.GetPropertyDefinition(cell);
var item = this.GetItem(owner, cell);
return(pd.PropertyName != null ? item : owner.ItemsSource);
}
/// <summary>
/// Gets the value in the specified cell.
/// </summary>
/// <param name="owner">The owner.</param>
/// <param name="cell">The cell.</param>
/// <returns>The value</returns>
public virtual object GetCellValue(DataGrid owner, CellRef cell)
{
if (cell.Column < 0 || cell.Column >= owner.Columns || cell.Row < 0 || cell.Row >= owner.Rows)
{
return(null);
}
var item = this.GetItem(owner, cell);
if (item != null)
{
var pd = owner.GetPropertyDefinition(cell);
if (pd != null)
{
var descriptor = this.GetPropertyDescriptor(pd);
if (descriptor != null)
{
return(descriptor.GetValue(item));
}
return(item);
}
}
return(null);
}
/// <summary>
/// Creates the cell definition for the specified cell.
/// </summary>
/// <param name="owner">The owner.</param>
/// <param name="cell">The cell.</param>
/// <returns>
/// The cell definition
/// </returns>
public virtual CellDefinition CreateCellDefinition(
DataGrid owner,
CellRef cell)
{
var pd = owner.GetPropertyDefinition(cell);
var item = owner.Operator.GetItem(owner, cell);
var cd = this.CreateCellDefinitionOverride(owner, cell, pd, item);
this.ApplyProperties(cd, owner, cell, pd, item);
return cd;
}
/// <summary>
/// Gets the binding path for the specified cell.
/// </summary>
/// <param name="owner">The owner.</param>
/// <param name="cell">The cell.</param>
/// <returns>
/// The binding path
/// </returns>
public override string GetBindingPath(DataGrid owner, CellRef cell)
{
var pd = owner.GetPropertyDefinition(cell);
if (pd?.PropertyName != null)
{
return(pd.PropertyName);
}
var index = this.GetItemIndex(owner, cell);
return($"[{index}]");
}
/// <summary>
/// Tries to set cell value in the specified cell.
/// </summary>
/// <param name="owner">The owner.</param>
/// <param name="cell">The cell.</param>
/// <param name="value">The value.</param>
/// <returns><c>true</c> if the cell value was set.</returns>
public virtual bool TrySetCellValue(DataGrid owner, CellRef cell, object value)
{
if (owner.ItemsSource != null)
{
var current = this.GetItem(owner, cell);
var pd = owner.GetPropertyDefinition(cell);
if (pd == null)
{
return(false);
}
if (current == null || pd.IsReadOnly)
{
return(false);
}
object convertedValue;
var targetType = this.GetPropertyType(pd, cell, current);
if (!TryConvert(value, targetType, out convertedValue))
{
return(false);
}
var descriptor = this.GetPropertyDescriptor(pd);
if (descriptor != null)
{
descriptor.SetValue(current, convertedValue);
}
else
{
this.SetValue(owner, cell, convertedValue);
if (!(owner.ItemsSource is INotifyCollectionChanged))
{
owner.UpdateCellContent(cell);
}
}
return(true);
}
return(false);
}
