private void MergeCellSelectionRegions(IEnumerable <DataGridCellInfo> selectedCellItems)
{
this.mergedSelectionRegions.Clear();
var mergedItemsByRows = new List <SelectionRegionInfo>();
// merge regions by rows considering selectionRegionsInfos represents only simple cells
int rowLine = -1;
int columnLine = -1;
SelectionRegionInfo startRegionInfo = null;
foreach (var item in selectedCellItems)
{
if (rowLine < 0 || item.RowItemInfo.LayoutInfo.Line != rowLine ||
item.Column.ItemInfo.LayoutInfo.Line != columnLine)
{
startRegionInfo = new SelectionRegionInfo()
{
StartItem = item, EndItem = item
};
rowLine = item.RowItemInfo.LayoutInfo.Line;
columnLine = item.Column.ItemInfo.LayoutInfo.Line;
mergedItemsByRows.Add(startRegionInfo);
}
else
{
startRegionInfo.EndItem = item;
}
columnLine++;
}
foreach (var item in mergedItemsByRows)
{
bool merged = false;
foreach (var prevRowItem in this.mergedSelectionRegions)
{
if (prevRowItem.EndItem.RowItemInfo.LayoutInfo.Line + 1 == item.StartItem.RowItemInfo.LayoutInfo.Line)
{
if ((prevRowItem.StartItem.Column == null && prevRowItem.EndItem.Column == null &&
item.StartItem.Column == null && item.EndItem.Column == null) ||
(prevRowItem.StartItem.Column.ItemInfo.LayoutInfo.Line == item.StartItem.Column.ItemInfo.LayoutInfo.Line &&
prevRowItem.EndItem.Column.ItemInfo.LayoutInfo.Line == item.EndItem.Column.ItemInfo.LayoutInfo.Line))
{
prevRowItem.EndItem = new DataGridCellInfo(item.StartItem.RowItemInfo, prevRowItem.EndItem.Column);
merged = true;
}
}
}
if (!merged)
{
this.mergedSelectionRegions.Add(item);
}
}
}
private void MergeRowSelectionRegions(IEnumerable <ItemInfo> selectedRowItems)
{
foreach (var item in selectedRowItems)
{
bool merged = false;
foreach (var prevRowItem in this.mergedSelectionRegions)
{
if (prevRowItem.EndItem.RowItemInfo.LayoutInfo.Line + 1 == item.LayoutInfo.Line || item.LayoutInfo.Line <= prevRowItem.EndItem.RowItemInfo.LayoutInfo.Line)
{
prevRowItem.EndItem = new DataGridCellInfo(item, null);
merged = true;
}
}
if (!merged)
{
var region = new SelectionRegionInfo();
region.StartItem = new DataGridCellInfo(item, null);
region.EndItem = new DataGridCellInfo(item, null);
this.mergedSelectionRegions.Add(region);
}
}
}
