private IEnumerable <BFUDetailsRowColumn <TItem> > GetJustifiedColumns(IEnumerable <BFUDetailsRowColumn <TItem> > newColumns, CheckboxVisibility newCheckboxVisibility, SelectionMode newSelectionMode, double viewportWidth, int resizingColumnIndex)
{
var rowCheckWidth = newSelectionMode != SelectionMode.None && newCheckboxVisibility != CheckboxVisibility.Hidden ? 48 : 0; //DetailsRowCheckbox width
var groupExpandedWidth = 0; //skipping this for now.
double totalWidth = 0;
var availableWidth = viewportWidth - (rowCheckWidth + groupExpandedWidth);
int count = 0;
System.Collections.Generic.List <BFUDetailsRowColumn <TItem> > adjustedColumns = new System.Collections.Generic.List <BFUDetailsRowColumn <TItem> >();
foreach (var col in newColumns)
{
adjustedColumns.Add(col);
col.CalculatedWidth = !double.IsNaN(col.MinWidth) ? col.MinWidth : 100;
if (_columnOverrides.TryGetValue(col.Key, out var overridenWidth))
{
col.CalculatedWidth = overridenWidth;
}
var isFirst = count + resizingColumnIndex == 0;
totalWidth += GetPaddedWidth(col, isFirst);
}
var lastIndex = adjustedColumns.Count() - 1;
// Shrink or remove collapsable columns.
while (lastIndex > 0 && totalWidth > availableWidth)
{
var col = adjustedColumns.ElementAt(lastIndex);
var minWidth = !double.IsNaN(col.MinWidth) ? col.MinWidth : 100;
var overflowWidth = totalWidth - availableWidth;
if (col.CalculatedWidth - minWidth >= overflowWidth || !col.IsCollapsible)
{
var originalWidth = col.CalculatedWidth;
col.CalculatedWidth = Math.Max(col.CalculatedWidth - overflowWidth, minWidth);
totalWidth -= originalWidth - col.CalculatedWidth;
}
else
{
totalWidth -= GetPaddedWidth(col, false);
adjustedColumns.RemoveRange(lastIndex, 1);
}
lastIndex--;
}
//Then expand columns starting at the beginning, until we've filled the width.
for (var i = 0; i < adjustedColumns.Count && totalWidth < availableWidth; i++)
{
var col = adjustedColumns[i];
var isLast = i == adjustedColumns.Count - 1;
var hasOverrides = _columnOverrides.TryGetValue(col.Key, out var overrides);
if (hasOverrides && !isLast)
{
continue;
}
var spaceLeft = availableWidth - totalWidth;
double increment = 0;
if (isLast)
{
increment = spaceLeft;
}
else
{
var maxWidth = col.MaxWidth;
var minWidth = !double.IsNaN(col.MinWidth) ? col.MinWidth : (!double.IsNaN(col.MaxWidth) ? col.MaxWidth : 100);
increment = !double.IsNaN(maxWidth) ? Math.Min(spaceLeft, maxWidth - minWidth) : spaceLeft;
}
col.CalculatedWidth += increment;
totalWidth += increment;
}
return(adjustedColumns);
}
private IEnumerable <BFUDetailsRowColumn <TItem> > GetAdjustedColumns(IEnumerable <TItem> newItems, DetailsListLayoutMode newLayoutMode, SelectionMode newSelectionMode, CheckboxVisibility newCheckboxVisibility, IEnumerable <BFUDetailsRowColumn <TItem> > newColumns, bool forceUpdate, int resizingColumnIndex)
{
var columns = Columns.EmptyIfNull();
var lastWidth = _lastWidth;
var lastSelectionMode = _lastSelectionMode;
if (!forceUpdate && _lastViewport.ScrollWidth == _viewport.ScrollWidth && SelectionMode == newSelectionMode && (Columns == null || newColumns == Columns))
{
return(Enumerable.Empty <BFUDetailsRowColumn <TItem> >());
}
// skipping default column builder... user must provide columns always
IEnumerable <BFUDetailsRowColumn <TItem> > adjustedColumns = null;
if (LayoutMode == DetailsListLayoutMode.FixedColumns)
{
adjustedColumns = GetFixedColumns(newColumns);
foreach (var col in adjustedColumns)
{
_columnOverrides[col.Key] = col.CalculatedWidth;
}
}
else
{
if (resizingColumnIndex != -1)
{
adjustedColumns = GetJustifiedColumnsAfterResize(newColumns, newCheckboxVisibility, newSelectionMode, _viewport.ScrollWidth, resizingColumnIndex);
}
else
{
adjustedColumns = GetJustifiedColumns(newColumns, newCheckboxVisibility, newSelectionMode, _viewport.ScrollWidth, resizingColumnIndex);
}
foreach (var col in adjustedColumns)
{
_columnOverrides[col.Key] = col.CalculatedWidth;
}
}
return(adjustedColumns);
}
private IEnumerable <BFUDetailsRowColumn <TItem> > GetJustifiedColumnsAfterResize(IEnumerable <BFUDetailsRowColumn <TItem> > newColumns, CheckboxVisibility newCheckboxVisibility, SelectionMode newSelectionMode, double viewportWidth, int resizingColumnIndex)
{
var fixedColumns = newColumns.Take(resizingColumnIndex);
foreach (var col in fixedColumns)
{
if (_columnOverrides.TryGetValue(col.Key, out var overridenWidth))
{
col.CalculatedWidth = overridenWidth;
}
else
{
col.CalculatedWidth = double.NaN;
}
}
int count = 0;
var fixedWidth = fixedColumns.Aggregate <BFUDetailsRowColumn <TItem>, double, double>(0, (total, column) => total + GetPaddedWidth(column, ++count == 0), x => x);
var remainingColumns = newColumns.Skip(resizingColumnIndex).Take(newColumns.Count() - resizingColumnIndex);
var remainingWidth = viewportWidth - fixedWidth;
var adjustedColumns = GetJustifiedColumns(remainingColumns, newCheckboxVisibility, newSelectionMode, remainingWidth, resizingColumnIndex);
return(Enumerable.Concat(fixedColumns, adjustedColumns));
}
private void AdjustColumns(IEnumerable <TItem> newItems, DetailsListLayoutMode newLayoutMode, SelectionMode newSelectionMode, CheckboxVisibility newCheckboxVisibility, IEnumerable <BFUDetailsRowColumn <TItem> > newColumns, bool forceUpdate, int resizingColumnIndex = -1)
{
_adjustedColumns = GetAdjustedColumns(newItems, newLayoutMode, newSelectionMode, newCheckboxVisibility, newColumns, forceUpdate, resizingColumnIndex);
}
