internal override AddRemoveLayoutResult RemoveItem(object changedItem, object addRemoveItem, int addRemoveItemIndex)
{
int removedItemsCount = 1;
int removedLinesCount = 0;
bool isVisible = true;
GroupInfo changedGroupInfo = this.GetGroupInfo(changedItem);
bool changedGroupIsRoot = changedGroupInfo == null;
int flatSlot = -1;
int rowSlot = -1;
int level = changedGroupIsRoot ? 0 : changedGroupInfo.Level + 1;
IGroup removedGroup = addRemoveItem as IGroup;
// We added/removed group so we need to index all subgroups.
if (removedGroup != null && changedItem != addRemoveItem)
{
GroupInfo groupInfo = this.GetGroupInfo(addRemoveItem);
System.Diagnostics.Debug.Assert(groupInfo != null, "Cannot remove group that are not indexed.");
flatSlot = groupInfo.Index;
isVisible = groupInfo.IsVisible();
removedItemsCount = groupInfo.GetLineSpan();
removedLinesCount = removedItemsCount;
if (!removedGroup.HasItems)
{
foreach (var nextGroupIndex in this.GroupHeadersTable.GetIndexes(flatSlot + 1))
{
GroupInfo nextGroupInfo = this.GroupHeadersTable.GetValueAt(nextGroupIndex);
if (nextGroupInfo.Level <= groupInfo.Level)
{
break;
}
this.RemoveGroupInfo(nextGroupInfo);
}
}
this.UpdateGroupHeadersTable(groupInfo.Index, -removedItemsCount);
this.itemInfoTable.Remove(removedGroup);
this.GroupHeadersTable.RemoveIndexesAndValues(flatSlot, removedItemsCount);
if (isVisible)
{
if (groupInfo.IsExpanded)
{
int collapsedItems = removedItemsCount - this.GetCollapsedSlotsCount(flatSlot, flatSlot + removedItemsCount - 1);
this.VisibleLineCount -= collapsedItems;
}
else
{
this.VisibleLineCount -= 1;
}
}
this.collapsedSlotsTable.RemoveIndexesAndValues(flatSlot, removedItemsCount);
if (changedGroupInfo != null)
{
// Update the group last slot.
changedGroupInfo.LastSubItemSlot -= removedItemsCount;
}
}
else
{
// We added new item (not group) into root group.
if (changedGroupIsRoot)
{
if (isVisible)
{
removedLinesCount = this.GetRemovedSlots(this.ItemsSource.Count, removedItemsCount);
this.VisibleLineCount -= removedLinesCount;
flatSlot = addRemoveItemIndex;
}
// slot should be already correct.
// No need to correct collapsed slots. They should be empty (e.g. no groups to collapse).
System.Diagnostics.Debug.Assert(this.GroupHeadersTable.IsEmpty, "GroupHeaders table should be empty.");
System.Diagnostics.Debug.Assert(this.collapsedSlotsTable.IsEmpty, "CollapsedSlots table should be empty since we don't have groups.");
}
else
{
var children = (changedGroupInfo.Item as IGroup).Items.Count;
// Be carefull that this represents lines/slots rather than items. Also consider if collapsed table should use this
removedLinesCount = this.GetRemovedSlots(children, removedItemsCount);
flatSlot = changedGroupInfo.Index + 1 + addRemoveItemIndex;
// Update the group last slot.
changedGroupInfo.LastSubItemSlot -= removedItemsCount;
this.GroupHeadersTable.RemoveIndex(flatSlot);
isVisible = changedGroupInfo.IsExpanded && changedGroupInfo.IsVisible();
if (isVisible)
{
this.collapsedSlotsTable.RemoveIndexes(flatSlot, removedLinesCount);
this.VisibleLineCount -= removedLinesCount;
}
else
{
this.collapsedSlotsTable.RemoveIndexesAndValues(flatSlot, removedLinesCount);
}
this.UpdateGroupHeadersTable(changedGroupInfo.Index, -removedItemsCount);
}
}
rowSlot = this.GetRowSlotFromFlatSlot(flatSlot);
// Update parent groups last slot.
CompactLayout.UpdateParentGroupInfosLastSlot(-removedItemsCount, changedGroupInfo);
// Update TotalCount.
this.TotalSlotCount -= removedLinesCount;
this.RemoveFromRenderInfo(removedLinesCount, rowSlot);
var layoutResult = new AddRemoveLayoutResult(rowSlot, removedLinesCount);
foreach (var strategy in this.LayoutStrategies)
{
strategy.OnItemRemoved(layoutResult);
}
// return result indexes so that changed can be reflected to UI.
return(layoutResult);
}
public abstract void OnItemRemoved(AddRemoveLayoutResult layoutResult);
internal override AddRemoveLayoutResult RemoveItem(object changedItem, object addRemoveItem, int addRemoveItemIndex)
{
int count = 1;
bool isVisible = true;
GroupInfo changedGroupInfo = this.GetGroupInfo(changedItem);
bool changedGroupIsRoot = changedGroupInfo == null;
int slot = addRemoveItemIndex;
int level = changedGroupIsRoot ? 0 : changedGroupInfo.Level + 1;
IGroup removedGroup = addRemoveItem as IGroup;
// We added/removed group so we need to index all subgroups.
if (removedGroup != null && changedItem != addRemoveItem)
{
GroupInfo groupInfo = this.GetGroupInfo(addRemoveItem);
System.Diagnostics.Debug.Assert(groupInfo != null, "Cannot remove group that are not indexed.");
slot = groupInfo.Index;
isVisible = groupInfo.IsVisible();
count = groupInfo.GetLineSpan();
if (!removedGroup.HasItems)
{
foreach (var nextGroupIndex in this.groupHeadersTable.GetIndexes(slot + 1))
{
GroupInfo nextGroupInfo = this.groupHeadersTable.GetValueAt(nextGroupIndex);
if (nextGroupInfo.Level <= groupInfo.Level)
{
break;
}
this.RemoveGroupInfo(nextGroupInfo);
}
}
this.UpdateGroupHeadersTable(groupInfo.Index, -count);
this.itemInfoTable.Remove(removedGroup);
this.groupHeadersTable.RemoveIndexesAndValues(slot, count);
if (isVisible)
{
if (groupInfo.IsExpanded)
{
int collapsedItems = count - this.GetCollapsedSlotsCount(slot, slot + count - 1);
this.visibleLineCount -= collapsedItems;
}
else
{
this.visibleLineCount -= 1;
}
}
this.collapsedSlotsTable.RemoveIndexesAndValues(slot, count);
if (changedGroupInfo != null)
{
// Update the group last slot.
changedGroupInfo.LastSubItemSlot -= count;
}
}
else
{
// We added new item (not group) into root group.
if (changedGroupIsRoot)
{
if (isVisible)
{
this.visibleLineCount -= count;
}
// slot should be already correct.
// No need to correct collapsed slots. They should be empty (e.g. no groups to collapse).
System.Diagnostics.Debug.Assert(this.groupHeadersTable.IsEmpty, "GroupHeaders table should be empty.");
System.Diagnostics.Debug.Assert(this.collapsedSlotsTable.IsEmpty, "CollapsedSlots table should be empty since we don't have groups.");
}
else
{
// We added new item (not group) into existing bottom level group (not root group).
slot = changedGroupInfo.Index + 1 + addRemoveItemIndex;
// Update the group last slot.
changedGroupInfo.LastSubItemSlot -= count;
this.groupHeadersTable.RemoveIndex(slot);
isVisible = changedGroupInfo.IsExpanded && changedGroupInfo.IsVisible();
if (isVisible)
{
this.collapsedSlotsTable.RemoveIndexes(slot, count);
this.visibleLineCount -= count;
}
else
{
this.collapsedSlotsTable.RemoveIndexesAndValues(slot, count);
}
this.UpdateGroupHeadersTable(changedGroupInfo.Index, -count);
}
}
// Update parent groups last slot.
UpdateParentGroupInfosLastSlot(-count, changedGroupInfo);
// Update TotalCount.
this.totalCount -= count;
// Insert new records into IndexTree.
this.RenderInfo.RemoveRange(slot, count);
var layoutResult = new AddRemoveLayoutResult(slot, count);
foreach (var strategy in this.LayoutStrategies)
{
strategy.OnItemRemoved(layoutResult);
}
// return result indexes so that changed can be reflected to UI.
return(layoutResult);
}
internal override AddRemoveLayoutResult AddItem(object changedItem, object addRemoveItem, int addRemoveItemIndex)
{
int addedItemsCount = 1;
bool isVisible = true;
var groupInfo = this.GetGroupInfo(changedItem);
bool changedGroupIsRoot = groupInfo == null;
int flatSlot = -1; // = addRemoveItemIndex;
int rowSlot = -1;
int addedLinesCount = 0;
int level = changedGroupIsRoot ? 0 : groupInfo.Level + 1;
// We added/removed group so we need to index all subgroups.
if (addRemoveItem is IGroup && changedItem != addRemoveItem)
{
flatSlot = this.GetInsertedGroupSlot(changedItem, addRemoveItemIndex);
isVisible = groupInfo != null ? (groupInfo.IsExpanded && groupInfo.IsVisible()) : true;
// We give a list in which to insert groups so that we can manually correct the indexes in groupHeadersTable.
List <GroupInfo> insertedGroups = new List <GroupInfo>();
addedItemsCount = this.CountAndPopulateTables(addRemoveItem, flatSlot, level, this.GroupLevels, groupInfo, false, insertedGroups);
addedLinesCount = addedItemsCount;
bool first = true;
int innerMostSlot = flatSlot;
foreach (var newGroupInfo in insertedGroups)
{
int groupInfoToInsertSpan = newGroupInfo.GetLineSpan();
if (first)
{
first = false;
this.GroupHeadersTable.InsertIndexes(newGroupInfo.Index, groupInfoToInsertSpan);
if (isVisible)
{
this.collapsedSlotsTable.InsertIndexes(flatSlot, addedItemsCount);
this.VisibleLineCount += addedItemsCount;
}
else
{
this.collapsedSlotsTable.InsertIndexesAndValues(flatSlot, addedItemsCount, false);
}
}
this.GroupHeadersTable.AddValue(newGroupInfo.Index, newGroupInfo);
// We get the inner most group so that we update groups after inner most (the upper one are newly created and their index and last slot count are correct.
// We get it only if the change is in the root group. In existing groups we know the correct slot.
if (changedGroupIsRoot)
{
innerMostSlot = newGroupInfo.Index;
}
}
// Update groups after current one.
this.UpdateGroupHeadersTable(innerMostSlot, addedItemsCount);
if (groupInfo != null)
{
// Update the group last slot.
groupInfo.LastSubItemSlot += addedItemsCount;
}
}
else
{
// We added new item (not group) into root group.
if (changedGroupIsRoot)
{
if (isVisible)
{
addedLinesCount = this.GetAddedSlots(this.ItemsSource.Count, addedItemsCount);
this.VisibleLineCount += addedLinesCount;
flatSlot = addRemoveItemIndex;
}
// slot should be already correct.
// No need to correct collapsed slots. They should be empty (e.g. no groups to collapse).
System.Diagnostics.Debug.Assert(this.GroupHeadersTable.IsEmpty, "GroupHeaders table should be empty.");
System.Diagnostics.Debug.Assert(this.collapsedSlotsTable.IsEmpty, "CollapsedSlots table should be empty since we don't have groups.");
}
else
{
// We added new item (not group) into existing bottom level group (not root group).
var children = (groupInfo.Item as IGroup).Items.Count;
addedLinesCount = this.GetAddedSlots(children, addedItemsCount);
flatSlot = groupInfo.Index + 1 + addRemoveItemIndex;
// We give a list in which to insert groups so that we can manually correct the indexes in groupHeadersTable.
// Update the group last slot.
groupInfo.LastSubItemSlot += addedItemsCount;
if (addedItemsCount > 0)
{
this.GroupHeadersTable.InsertIndex(flatSlot);
}
isVisible = groupInfo.IsExpanded && groupInfo.IsVisible();
if (addedItemsCount > 0)
{
if (isVisible)
{
this.collapsedSlotsTable.InsertIndexes(flatSlot, addedItemsCount);
this.VisibleLineCount += addedLinesCount;
}
else
{
this.collapsedSlotsTable.InsertIndexesAndValues(flatSlot, addedItemsCount, false);
}
}
this.UpdateGroupHeadersTable(groupInfo.Index, addedItemsCount);
}
}
rowSlot = this.GetRowSlotFromFlatSlot(flatSlot);
// Update parent groups last slot.
CompactLayout.UpdateParentGroupInfosLastSlot(addedItemsCount, groupInfo);
// Update TotalCount.
this.TotalSlotCount += addedLinesCount;
// Update Visible line count if not collapsed.
double length = isVisible ? this.averageItemLength : 0;
if (addedLinesCount >= 0)
{
this.InsertToRenderInfo(rowSlot, null, addedLinesCount);
}
var layoutResult = new AddRemoveLayoutResult(rowSlot, addedLinesCount);
foreach (var strategy in this.LayoutStrategies)
{
strategy.OnItemAdded(layoutResult);
}
// return result indexes so that changed can be reflected to UI.
return(layoutResult);
}
internal override AddRemoveLayoutResult RemoveItem(object changedItem, object addRemoveItem, int addRemoveItemIndex)
{
int totalRemovedLines = 0;
int count = 1;
bool isVisible = true;
GroupInfo changedGroupInfo = this.GetGroupInfo(changedItem);
bool changedGroupIsRoot = changedGroupInfo == null;
int slot = addRemoveItemIndex;
int level = changedGroupIsRoot ? 0 : changedGroupInfo.Level + 1;
IGroup removedGroup = addRemoveItem as IGroup;
// We added/removed group so we need to index all subgroups.
if (removedGroup != null && changedItem != addRemoveItem)
{
GroupInfo groupInfo = this.GetGroupInfo(addRemoveItem);
System.Diagnostics.Debug.Assert(groupInfo != null, "Cannot remove group that are not indexed.");
slot = groupInfo.Index;
isVisible = groupInfo.IsVisible();
count = groupInfo.GetLineSpan();
// TODO: VVG -- fix this, we should take into account the fact that there is an int number of items in a row
totalRemovedLines = (int)Math.Ceiling((this.VisibleLineCount * this.DefaultItemOppositeLength) / this.availableOppositeLength) - (int)Math.Ceiling(((this.VisibleLineCount - count) * this.DefaultItemOppositeLength) / this.availableOppositeLength);
if (!removedGroup.HasItems)
{
foreach (var nextGroupIndex in this.groupHeadersTable.GetIndexes(slot + 1))
{
GroupInfo nextGroupInfo = this.groupHeadersTable.GetValueAt(nextGroupIndex);
if (nextGroupInfo.Level <= groupInfo.Level)
{
break;
}
this.RemoveGroupInfo(nextGroupInfo);
}
}
this.UpdateGroupHeadersTable(groupInfo.Index, -count);
this.groupInfoTable.Remove(removedGroup);
this.groupHeadersTable.RemoveIndexesAndValues(slot, count);
if (isVisible)
{
if (groupInfo.IsExpanded)
{
int collapsedItems = count - this.GetCollapsedSlotsCount(slot, slot + count - 1);
this.removedItemsLength += this.ColumnSlotsRenderInfo.ValueForIndex(slot);
if (this.availableOppositeLength - this.removedItemsLength < this.DefaultItemOppositeLength)
{
this.removedItemsLength = 0;
}
}
else
{
// TODO: Deal with this when implementing collapsible groups.
// count = 1;
}
totalRemovedLines = count;
}
if (changedGroupInfo != null)
{
// Update the group last slot.
changedGroupInfo.LastSubItemSlot -= count;
}
}
else
{
// We removed an item (not group) from root group.
if (changedGroupIsRoot)
{
if (isVisible)
{
var columnsCount = Math.Floor(this.availableOppositeLength / this.DefaultItemOppositeLength);
totalRemovedLines = (int)Math.Ceiling(this.totalItemsCount / (double)columnsCount) - (int)Math.Ceiling((this.totalItemsCount - count) / columnsCount);
}
// slot should be already correct.
// No need to correct collapsed slots. They should be empty (e.g. no groups to collapse).
System.Diagnostics.Debug.Assert(this.groupHeadersTable.IsEmpty, "GroupHeaders table should be empty.");
//// System.Diagnostics.Debug.Assert(this.collapsedSlotsTable.IsEmpty, "CollapsedSlots table should be empty since we don't have groups.");
}
else
{
// We added new item (not group) into existing bottom level group (not root group).
slot = changedGroupInfo.Index + 1 + addRemoveItemIndex;
// Update the group last slot.
changedGroupInfo.LastSubItemSlot -= count;
this.groupHeadersTable.RemoveIndex(slot);
isVisible = changedGroupInfo.IsExpanded && changedGroupInfo.IsVisible();
if (isVisible)
{
var changedGroupItemsCount = changedGroupInfo.LastSubItemSlot + count - changedGroupInfo.Index;
int itemsPerRow = (int)(this.availableOppositeLength / this.DefaultItemOppositeLength);
if (changedGroupItemsCount % itemsPerRow == count)
{
totalRemovedLines++;
}
}
this.UpdateGroupHeadersTable(changedGroupInfo.Index, -count);
}
}
// Update parent groups last slot.
UpdateParentGroupInfosLastSlot(-count, changedGroupInfo);
// Update TotalCount.
this.VisibleLineCount -= totalRemovedLines;
this.totalItemsCount -= count;
this.TotalSlotCount -= totalRemovedLines;
if (this.RenderInfo.Count > 0 && totalRemovedLines > 0)
{
var removeRowIndex = this.CalculateNextRowPosition(slot);
this.RenderInfo.RemoveRange(removeRowIndex, totalRemovedLines);
}
this.ColumnSlotsRenderInfo.RemoveRange(slot, count);
this.OnAvailableLengthChanged(this.AvailableOppositeLength, this.AvailableOppositeLength);
var layoutResult = new AddRemoveLayoutResult(slot, count);
foreach (var strategy in this.LayoutStrategies)
{
strategy.OnItemRemoved(layoutResult);
}
// return result indexes so that changed can be reflected to UI.
return(layoutResult);
}
internal override AddRemoveLayoutResult AddItem(object changedItem, object addRemoveItem, int addRemoveItemIndex)
{
int count = 1;
int totalLines = 0;
bool isVisible = true;
var groupInfo = this.GetGroupInfo(changedItem);
bool changedGroupIsRoot = groupInfo == null;
int index = addRemoveItemIndex;
int level = changedGroupIsRoot ? 0 : groupInfo.Level + 1;
// We added/removed group so we need to index all subgroups.
if (addRemoveItem is IGroup && changedItem != addRemoveItem)
{
index = this.GetInsertedGroupSlot(changedItem, addRemoveItemIndex);
isVisible = groupInfo != null ? (groupInfo.IsExpanded && groupInfo.IsVisible()) : true;
// We give a list in which to insert groups so that we can manually correct the indexes in groupHeadersTable.
List <GroupInfo> insertedGroups = new List <GroupInfo>();
count = this.CountAndPopulateTables(addRemoveItem, index, level, this.GroupLevels, groupInfo, false, insertedGroups, ref totalLines);
bool first = true;
int innerMostSlot = index;
foreach (var newGroupInfo in insertedGroups)
{
int groupInfoToInsertSpan = newGroupInfo.GetLineSpan();
if (first)
{
first = false;
this.groupHeadersTable.InsertIndexes(newGroupInfo.Index, groupInfoToInsertSpan);
if (isVisible)
{
this.ColumnSlotsRenderInfo.InsertRange(index, IndexStorage.UnknownItemLength, count);
}
}
this.groupHeadersTable.AddValue(newGroupInfo.Index, newGroupInfo);
// We get the inner most group so that we update groups after inner most (the upper one are newly created and their index and last slot count are correct.
// We get it only if the change is in the root group. In existing groups we know the correct slot.
if (changedGroupIsRoot)
{
innerMostSlot = newGroupInfo.Index;
}
}
// Update groups after current one.
this.UpdateGroupHeadersTable(innerMostSlot, count);
if (groupInfo != null)
{
// Update the group last slot.
groupInfo.LastSubItemSlot += count;
}
}
else
{
// We added new item in flat scenario.
if (changedGroupIsRoot)
{
if (isVisible)
{
var columnsCount = Math.Floor(this.availableOppositeLength / this.DefaultItemOppositeLength);
totalLines = (int)Math.Ceiling((this.totalItemsCount + count) / columnsCount) - (int)Math.Ceiling(this.totalItemsCount / columnsCount);
this.ColumnSlotsRenderInfo.InsertRange(index, this.DefaultItemOppositeLength, count);
}
// slot should be already correct.
// No need to correct collapsed slots. They should be empty (e.g. no groups to collapse).
System.Diagnostics.Debug.Assert(this.groupHeadersTable.IsEmpty, "GroupHeaders table should be empty.");
//// System.Diagnostics.Debug.Assert(this.collapsedSlotsTable.IsEmpty, "CollapsedSlots table should be empty since we don't have groups.");
}
else
{
// We added new item (not group) into existing bottom level group (not root group).
index = groupInfo.Index + 1 + addRemoveItemIndex;
// Update the group last slot.
groupInfo.LastSubItemSlot += count;
this.groupHeadersTable.InsertIndex(index);
isVisible = groupInfo.IsExpanded && groupInfo.IsVisible();
if (isVisible)
{
if (groupInfo.Level == this.GroupLevels - 1)
{
var columnsCount = Math.Floor(this.availableOppositeLength / this.DefaultItemOppositeLength);
// get children count.
var childrenCount = (groupInfo.Item as IGroup).Items.Count;
totalLines = (int)Math.Ceiling(childrenCount / columnsCount) - (int)Math.Ceiling((childrenCount - count) / columnsCount);
}
}
this.UpdateGroupHeadersTable(groupInfo.Index, count);
this.ColumnSlotsRenderInfo.InsertRange(index, this.DefaultItemOppositeLength, count);
}
}
// Update parent groups last slot.
UpdateParentGroupInfosLastSlot(count, groupInfo);
// Update TotalCount.
this.VisibleLineCount += totalLines;
this.TotalSlotCount += totalLines;
this.totalItemsCount += count;
// Update Visible line count if not collapsed.
double length = isVisible ? this.averageItemLength : 0;
// Insert new records into IndexTree.
var insertRowIndex = this.CalculateNextRowPosition(index);
this.RenderInfo.InsertRange(insertRowIndex, IndexStorage.UnknownItemLength, totalLines);
this.OnAvailableLengthChanged(this.AvailableOppositeLength, this.AvailableOppositeLength);
var layoutResult = new AddRemoveLayoutResult(index, count);
foreach (var strategy in this.LayoutStrategies)
{
strategy.OnItemAdded(layoutResult);
}
// return result indexes so that changed can be reflected to UI.
return(layoutResult);
}
public override void OnItemRemoved(AddRemoveLayoutResult layoutResult)
{
}
public override void OnItemRemoved(AddRemoveLayoutResult layoutResult)
{
// throw new NotImplementedException();
}
public override void OnItemAdded(AddRemoveLayoutResult layoutResult)
{
var start = Math.Min(this.slotsToBuild.LowerBound, layoutResult.StartSlot);
this.slotsToBuild = new Range <bool>(start, this.slotsToBuild.UpperBound + layoutResult.SlotsCount, true);
}