private void this_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
// Reset the column organization.
// This should be useless under the current scenario.
foreach (var dc in dataGrid.Columns.Except(StandardColumns.Select(sc => sc.Column)).ToList())
{
dataGrid.Columns.Remove(dc);
}
foreach (var dc in dataGrid.Columns)
{
dc.SetValue(ColumnInUseProperty, false);
}
// Our DataContext should always be an ITable, but null should be allowed (though we don't need.)
var table = e.NewValue as ITableController;
if (table == null)
{
return;
}
// Show / hide standard columns.
// Unused standard columns are kept in the list, but users can't view them.
// We use a false value of ColumnInUse atatched property to tell the case.
foreach (var colInfo in StandardColumns)
{
var in_use = table.AllRows.Any(colInfo.InUse);
colInfo.Column.Visibility = in_use ? Visibility.Visible : Visibility.Collapsed;
colInfo.Column.SetValue(ColumnInUseProperty, in_use);
}
// A special handling of Asset column visibility.
// There are many cases that a file contains only one Asset,
// and Asset column is just redundant in the cases, so hide it in the cases.
// (but users can still view it if they want.)
if (Asset.Visibility == Visibility.Visible &&
Asset2.Visibility != Visibility.Visible &&
!table.AllRows.Select(r => r.Asset).Distinct().Skip(1).Any())
{
Asset.Visibility = Visibility.Collapsed;
}
// Yet another special handling of TagList column visibility.
// It is always hidden initially.
TagList.Visibility = Visibility.Collapsed;
// Create columns for additional properties.
// Their initial shown/hidden states are specified by the DOC module via AdditionalProps.
// ColumnInUse attached property is always set to true so that users can view any column.
// We don't check whether an additonal property is actually used;
// If such a checking is essential for a particular additional property,
// the responsible AssetReader can do it when constructing the Properties.
// See TableController.cs for the interaction between the AssetReader and TableController.AdditionalProps.
foreach (var props in table.AdditionalProps)
{
var column = new DataGridTextColumn()
{
Header = props.Key.Replace("_", " "), // XXX: No, we should not do this!
Binding = new Binding("[" + props.Index + "]"),
Visibility = props.Visible ? Visibility.Visible : Visibility.Collapsed,
ElementStyle = FindResource("AdditionalColumnElementStyle") as Style,
};
column.SetValue(ColumnInUseProperty, true);
dataGrid.Columns.Add(column);
}
// Set FilterOptions attached property to all in-use columns.
foreach (var column in dataGrid.Columns.Where(GetColumnInUse))
{
var grabber = CreateGrabber(column.SortMemberPath);
var list = table.AllRows.Select(grabber).Distinct().OrderBy(s => string.IsNullOrEmpty(s) ? 0 : 1).ThenBy(s => s).Select(s => FilterOption.Get(s));
column.SetValue(FilterOptionsProperty, list);
}
}
private void UpdateColumns()
{
var table = DataContext as ITableController;
if (table == null)
{
return;
}
// Use/unuse standard columns.
// Unused standard columns are kept in the list, but users can't view them.
// We use a false value of ColumnInUse atatched property to tell the case.
// Unused (ColumnInUse == false) columns can be used (ColumnInUse == true) in future reloading.
// Once used, however, a column will never get back to Unused status.
foreach (var colInfo in StandardColumns)
{
if (!GetColumnInUse(colInfo.Column) && table.AllRows.Any(colInfo.InUse))
{
SetColumnInUse(colInfo.Column, true);
}
}
// Create columns for additional properties.
// Their initial shown/hidden states are specified by the DOC module via AdditionalProps.
// ColumnInUse attached property is always set to true so that users can view any column.
// We don't check whether an additonal property is actually used;
// If such a checking is essential for a particular additional property,
// the responsible AssetReader can do it when constructing the Properties.
// See TableController.cs for the interaction between the AssetReader and TableController.AdditionalProps.
foreach (var props in table.AdditionalProps)
{
var path = "[" + props.Index + "]";
// Don't add a duplicate column.
if (dataGrid.Columns.Any(col => ((col as DataGridTextColumn)?.Binding as Binding)?.Path?.Path == path))
{
continue;
}
var column = new DataGridTextColumn()
{
Header = props.Key.Replace("_", " "), // XXX: No, we should not do this!
Binding = new Binding(path),
Visibility = props.Visible ? Visibility.Visible : Visibility.Collapsed,
ElementStyle = FindResource("AdditionalColumnElementStyle") as Style,
};
column.SetValue(ColumnInUseProperty, true);
// a sort of a hack to avoid a few columns (containing some very long text) to occupy the entire space.
// The following code includes several magic numbers that were determined without grounds. FIXME.
if (table.AllRows.Take(100)
.Select(row => row[props.Index])
.Any(text => text?.Length > 50 || text?.IndexOf('\n') >= 0))
{
column.Width = DataGridLengthStar;
}
dataGrid.Columns.Add(column);
}
// Set FilterOptions attached property to all in-use columns.
foreach (var column in dataGrid.Columns.Where(GetColumnInUse))
{
var grabber = CreateGrabber(column.SortMemberPath);
var list = table.AllRows.Select(grabber).Distinct().OrderBy(s => string.IsNullOrEmpty(s) ? 0 : 1).ThenBy(s => s).Select(s => FilterOption.Get(s));
column.SetValue(FilterOptionsProperty, list);
}
}
