/// <summary>
/// Binds <see cref="DataPresenter"/> to <see cref="CheckBox"/> to select/deselect all rows.
/// </summary>
/// <param name="dataPresenter">The <see cref="DataPresenter"/></param>
/// <returns>The scalar binding object.</returns>
public static ScalarBinding <CheckBox> BindToCheckBox(this DataPresenter dataPresenter)
{
return(ToSelectAll <CheckBox>(dataPresenter));
}
private bool ConfirmEndEdit()
{
return(DataPresenter == null ? true : DataPresenter.ConfirmEndEdit());
}
public void Initialize(DataPresenter dataPresenter)
{
DataPresenter = dataPresenter;
}
private static ScalarBinding <T> ToSelectAll <T>(this DataPresenter dataPresenter)
where T : ToggleButton, new()
{
if (dataPresenter == null)
{
throw new ArgumentNullException(nameof(dataPresenter));
}
var trigger = new PropertyChangedTrigger <T>(ToggleButton.IsCheckedProperty).WithAction(v =>
{
var binding = (TwoWayBinding)v.GetBinding();
if (binding.IsRefreshing)
{
return;
}
var isChecked = v.IsChecked;
if (!isChecked.HasValue)
{
return;
}
var isSelected = isChecked.GetValueOrDefault();
var rows = dataPresenter.Rows;
bool anyChange = false;
for (int i = 0; i < rows.Count; i++)
{
var row = rows[i];
var oldValue = row.IsSelected;
row.IsSelected = isSelected;
if (row.IsSelected != oldValue)
{
anyChange = true;
}
}
if (!anyChange)
{
dataPresenter.InvalidateView();
}
});
return(new ScalarBinding <T>(onRefresh: v =>
{
var selectedCount = dataPresenter.SelectedRows.Count;
if (selectedCount == 0)
{
v.IsChecked = false;
}
else if (selectedCount == dataPresenter.Rows.Count - (dataPresenter.VirtualRow != null ? 1 : 0))
{
v.IsChecked = true;
}
else
{
v.IsChecked = null;
}
},
onSetup: v =>
{
trigger.Attach(v);
},
onCleanup: v =>
{
trigger.Detach(v);
}));
}
/// <summary>
/// Binds <see cref="DataPresenter"/> to <see cref="GridHeader"/> to select/deselect all rows.
/// </summary>
/// <param name="dataPresenter">The DataPresenter.</param>
/// <returns>The scalar binding object.</returns>
public static ScalarBinding <GridHeader> BindToGridHeader(this DataPresenter dataPresenter)
{
return(ToSelectAll <GridHeader>(dataPresenter));
}
void IService.Initialize(DataPresenter dataPresenter)
{
throw new NotSupportedException();
}
public DataLoader(DataPresenter <T> dataPresenter)
{
Debug.Assert(dataPresenter != null);
_dataPresenter = dataPresenter;
}
