internal ItemsChangedEventArgs(NotifyCollectionChangedAction action,
GeneratorPosition position,
int itemCount,
int itemUICount) : this(action, position, new GeneratorPosition(-1, 0), itemCount, itemUICount)
{
}
internal CustomGeneratorChangedEventArgs( NotifyCollectionChangedAction action, GeneratorPosition position, int index, GeneratorPosition oldPosition, int oldIndex, int itemCount, int itemUICount, IList<DependencyObject> removedContainers )
{
_action = action;
_position = position;
_oldPosition = oldPosition;
_itemCount = itemCount;
_itemUICount = itemUICount;
_index = index;
_oldIndex = oldIndex;
m_removedContainers = removedContainers;
}
private void CleanUpItems(int minDesiredGenerated, int maxDesiredGenerated) {
var internalChildren = InternalChildren;
var itemContainerGenerator = ItemContainerGenerator;
for (var i = internalChildren.Count - 1; i >= 0; i--) {
var position = new GeneratorPosition(i, 0);
var num2 = itemContainerGenerator.IndexFromGeneratorPosition(position);
if ((num2 >= minDesiredGenerated) && (num2 <= maxDesiredGenerated)) continue;
itemContainerGenerator.Remove(position, 1);
RemoveInternalChildRange(i, 1);
}
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
internal ItemsChangedEventArgs(NotifyCollectionChangedAction action,
GeneratorPosition position,
GeneratorPosition oldPosition,
int itemCount,
int itemUICount)
{
_action = action;
_position = position;
_oldPosition = oldPosition;
_itemCount = itemCount;
_itemUICount = itemUICount;
}
protected override Size MeasureOverride(Size availableSize)
{
var desiredSize = new Size();
ItemsControl parent = ItemsControl.GetItemsOwner(this);
int count = parent != null && parent.HasItems ? parent.Items.Count : 0;
// Next line needed otherwise ItemContainerGenerator is null (bug in WinFX ?)
UIElementCollection children = InternalChildren;
IItemContainerGenerator generator = ItemContainerGenerator;
if (count == 0)
{
generator.RemoveAll();
if (children.Count > 0) RemoveInternalChildRange(0, children.Count);
return desiredSize;
}
// Get the generator position of the first visible data item
GeneratorPosition startPos = generator.GeneratorPositionFromIndex(count - 1);
using (generator.StartAt(startPos, GeneratorDirection.Forward, true))
{
bool newlyRealized;
// Get or create the child
var child = generator.GenerateNext(out newlyRealized) as UIElement;
if (child != null)
{
if (newlyRealized)
{
AddInternalChild(child);
generator.PrepareItemContainer(child);
}
child.Measure(availableSize);
desiredSize = child.DesiredSize;
}
}
// Remove all other items than the top one
for (int i = children.Count - 1; i >= 0; i--)
{
var childGeneratorPos = new GeneratorPosition(i, 0);
int itemIndex = generator.IndexFromGeneratorPosition(childGeneratorPos);
if (itemIndex == count - 1) continue;
generator.Remove(childGeneratorPos, 1);
RemoveInternalChildRange(i, 1);
}
return desiredSize;
}
// Token: 0x06006113 RID: 24851 RVA: 0x001B3EF4 File Offset: 0x001B20F4
private void MoveChildren(GeneratorPosition fromPos, GeneratorPosition toPos, int containerCount)
{
if (fromPos == toPos)
{
return;
}
IItemContainerGenerator generator = base.Generator;
int num = generator.IndexFromGeneratorPosition(toPos);
UIElement[] array = new UIElement[containerCount];
for (int i = 0; i < containerCount; i++)
{
UIElement uielement = this._generatedItemsCollection[fromPos.Index + i];
this.RemoveChild(uielement);
array[i] = uielement;
}
this._generatedItemsCollection.RemoveRange(fromPos.Index, containerCount);
for (int j = 0; j < containerCount; j++)
{
this._generatedItemsCollection.Insert(num + j, array[j]);
}
}
// THE HACK implementation. A copy from Microsofts VirtualizingStackPanel
void RemoveChildRange(GeneratorPosition position, int itemCount, int itemUICount) {
if (IsItemsHost) {
UIElementCollection children = InternalChildren;
int pos = position.Index;
if (position.Offset > 0) {
// An item is being removed after the one at the index
pos++;
}
if (pos < children.Count) {
int uiCount = itemUICount;
Debug.Assert((itemCount == itemUICount) || (itemUICount == 0),
"Both ItemUICount and ItemCount should be equal or ItemUICount should be 0.");
if (uiCount > 0) {
RemoveInternalChildRange(pos, uiCount);
//VirtualizingPanel.RemoveInternalChildRange(children, pos, uiCount);
//if (IsVirtualizing && InRecyclingMode) {
//_realizedChildren.RemoveRange(pos, uiCount);
//}
}
}
}
}
void OnItemMoved(object item, int oldIndex, int newIndex)
{
if (_itemMap == null)
{
// reentrant call (from RemoveAllInternal) shouldn't happen,
// but if it does, don't crash
Debug.Assert(false, "unexpected reentrant call to OnItemMoved");
return;
}
DependencyObject container = null; // the corresponding container
int containerCount = 0;
UnrealizedItemBlock uib;
// search for the moved item
GeneratorPosition position;
ItemBlock block;
int offsetFromBlockStart;
int correctIndex;
GetBlockAndPosition(item, oldIndex, true, out position, out block, out offsetFromBlockStart, out correctIndex);
GeneratorPosition oldPosition = position;
RealizedItemBlock rib = block as RealizedItemBlock;
if (rib != null)
{
containerCount = 1;
container = rib.ContainerAt(offsetFromBlockStart);
}
// remove the item, and remove the block if it's now empty
MoveItems(block, offsetFromBlockStart + 1, block.ItemCount - offsetFromBlockStart - 1, block, offsetFromBlockStart, 0);
--block.ItemCount;
RemoveAndCoalesceBlocksIfNeeded(block);
//
// now insert into the new spot.
//
position = new GeneratorPosition(-1,0);
block = _itemMap.Next;
offsetFromBlockStart = newIndex;
while (block != _itemMap && offsetFromBlockStart >= block.ItemCount)
{
offsetFromBlockStart -= block.ItemCount;
if (block.ContainerCount > 0)
{
position.Index += block.ContainerCount;
position.Offset = 0;
}
else
{
position.Offset += block.ItemCount;
}
block = block.Next;
}
position.Offset += offsetFromBlockStart + 1;
// if it's an unrealized block, add the item by bumping the count
uib = block as UnrealizedItemBlock;
if (uib != null)
{
MoveItems(uib, offsetFromBlockStart, 1, uib, offsetFromBlockStart+1, 0);
++ uib.ItemCount;
}
// if the item can be added to a previous unrealized block, do so
else if ((offsetFromBlockStart == 0 || block == _itemMap) &&
((uib = block.Prev as UnrealizedItemBlock) != null))
{
++ uib.ItemCount;
}
// otherwise, create a new unrealized block
else
{
uib = new UnrealizedItemBlock();
uib.ItemCount = 1;
// split the current realized block, if necessary
if (offsetFromBlockStart > 0 && (rib = block as RealizedItemBlock) != null)
{
RealizedItemBlock newBlock = new RealizedItemBlock();
MoveItems(rib, offsetFromBlockStart, rib.ItemCount - offsetFromBlockStart, newBlock, 0, offsetFromBlockStart);
newBlock.InsertAfter(rib);
position.Index += block.ContainerCount;
position.Offset = 1;
offsetFromBlockStart = 0;
block = newBlock;
}
uib.InsertBefore(block);
}
DependencyObject parent = VisualTreeHelper.GetParentInternal(container);
// tell layout what happened
if (ItemsChanged != null)
{
ItemsChanged(this, new ItemsChangedEventArgs(NotifyCollectionChangedAction.Move, position, oldPosition, 1, containerCount));
}
// unhook the container. Do this after layout has (presumably) removed it from
// the UI, so that it doesn't inherit DataContext falsely.
if (container != null)
{
if (parent == null || VisualTreeHelper.GetParentInternal(container) != parent)
{
UnlinkContainerFromItem(container, item);
}
else
{
// If the container has the same visual parent as before then that means that
// the container was just repositioned within the parent's VisualCollection.
// we don't need to unlink the container, but we do need to re-realize the block.
Realize(uib, offsetFromBlockStart, item, container);
}
}
// fix up the AlternationIndex on containers affected by the move
if (_alternationCount > 0)
{
// start with the smaller of the two positions, and proceed forward.
// This tends to preserve the AlternatonIndex on containers at the
// front of the list, as users expect
int index = Math.Min(oldIndex, newIndex);
GetBlockAndPosition(index, out position, out block, out offsetFromBlockStart);
SetAlternationIndex(block, offsetFromBlockStart, GeneratorDirection.Forward);
}
}
void GetBlockAndPosition(object item, bool deletedFromItems, out GeneratorPosition position, out ItemBlock block, out int offsetFromBlockStart, out int correctIndex)
{
correctIndex = 0;
int containerIndex = 0;
offsetFromBlockStart = 0;
int deletionOffset = deletedFromItems ? 1 : 0;
position = new GeneratorPosition(-1, 0);
if (_itemMap == null)
{
// handle reentrant call
block = null;
return;
}
for (block = _itemMap.Next; block != _itemMap; block = block.Next)
{
UnrealizedItemBlock uib;
RealizedItemBlock rib = block as RealizedItemBlock;
if (rib != null)
{
// compare realized items with item for which we are searching
offsetFromBlockStart = rib.OffsetOfItem(item);
if (offsetFromBlockStart >= 0)
{
position = new GeneratorPosition(containerIndex + offsetFromBlockStart, 0);
correctIndex += offsetFromBlockStart;
break;
}
}
else if ((uib = block as UnrealizedItemBlock) != null)
{
// if the item isn't realized, we can't find it
// directly. Instead, look for indirect evidence that it
// belongs to this block by checking the indices of
// nearby realized items.
#if DEBUG
// Sanity check - make sure data structure is OK so far.
rib = block.Prev as RealizedItemBlock;
if (rib != null && rib.ContainerCount > 0)
{
Debug.Assert(Object.Equals(rib.ItemAt(rib.ContainerCount - 1),
ItemsInternal[correctIndex - 1]),
"Generator data structure is corrupt");
}
#endif
bool itemIsInCurrentBlock = false;
rib = block.Next as RealizedItemBlock;
if (rib != null && rib.ContainerCount > 0)
{
// if the index of the next realized item is off by one,
// the deleted item likely comes from the current
// unrealized block.
itemIsInCurrentBlock =
Object.Equals(rib.ItemAt(0),
ItemsInternal[correctIndex + block.ItemCount - deletionOffset]);
}
else if (block.Next == _itemMap)
{
// similarly if we're at the end of the list and the
// overall count is off by one, or if the current block
// is the only block, the deleted item likely
// comes from the current (last) unrealized block
itemIsInCurrentBlock = block.Prev == _itemMap ||
(ItemsInternal.Count == correctIndex + block.ItemCount - deletionOffset);
}
if (itemIsInCurrentBlock)
{
// we don't know where it is in this block, so assume
// it's the very first item.
offsetFromBlockStart = 0;
position = new GeneratorPosition(containerIndex-1, 1);
break;
}
}
correctIndex += block.ItemCount;
containerIndex += block.ContainerCount;
}
if (block == _itemMap)
{
// There's no way of knowing which unrealized block it belonged to, so
// the data structure can't be updated correctly. Sound the alarm.
throw new InvalidOperationException(SR.Get(SRID.CannotFindRemovedItem));
}
}
// Called when an item is added to the items collection
void OnItemAdded(object item, int index)
{
if (_itemMap == null)
{
// reentrant call (from RemoveAllInternal) shouldn't happen,
// but if it does, don't crash
Debug.Assert(false, "unexpected reentrant call to OnItemAdded");
return;
}
ValidateAndCorrectIndex(item, ref index);
GeneratorPosition position = new GeneratorPosition(-1,0);
// find the block containing the new item
ItemBlock block = _itemMap.Next;
int offset = index;
while (block != _itemMap && offset >= block.ItemCount)
{
offset -= block.ItemCount;
position.Index += block.ContainerCount;
block = block.Next;
}
position.Offset = offset + 1;
// if it's an unrealized block, add the item by bumping the count
UnrealizedItemBlock uib = block as UnrealizedItemBlock;
if (uib != null)
{
MoveItems(uib, offset, 1, uib, offset+1, 0);
++ uib.ItemCount;
}
// if the item can be added to a previous unrealized block, do so
else if ((offset == 0 || block == _itemMap) &&
((uib = block.Prev as UnrealizedItemBlock) != null))
{
++ uib.ItemCount;
}
// otherwise, create a new unrealized block
else
{
uib = new UnrealizedItemBlock();
uib.ItemCount = 1;
// split the current realized block, if necessary
RealizedItemBlock rib;
if (offset > 0 && (rib = block as RealizedItemBlock) != null)
{
RealizedItemBlock newBlock = new RealizedItemBlock();
MoveItems(rib, offset, rib.ItemCount - offset, newBlock, 0, offset);
newBlock.InsertAfter(rib);
position.Index += block.ContainerCount;
position.Offset = 1;
block = newBlock;
}
uib.InsertBefore(block);
}
// tell generators what happened
if (MapChanged != null)
{
MapChanged(null, index, +1, uib, 0, 0);
}
// tell layout what happened
if (ItemsChanged != null)
{
ItemsChanged(this, new ItemsChangedEventArgs(NotifyCollectionChangedAction.Add, position, 1, 0));
}
}
void GetBlockAndPosition(object item, int itemIndex, bool deletedFromItems, out GeneratorPosition position, out ItemBlock block, out int offsetFromBlockStart, out int correctIndex)
{
if (itemIndex >= 0)
{
GetBlockAndPosition(itemIndex, out position, out block, out offsetFromBlockStart);
correctIndex = itemIndex;
}
else
{
GetBlockAndPosition(item, deletedFromItems, out position, out block, out offsetFromBlockStart, out correctIndex);
}
}
void GetBlockAndPosition(int itemIndex, out GeneratorPosition position, out ItemBlock block, out int offsetFromBlockStart)
{
position = new GeneratorPosition(-1, 0);
block = null;
offsetFromBlockStart = itemIndex;
if (_itemMap == null || itemIndex < 0)
return;
int containerIndex = 0;
for (block = _itemMap.Next; block != _itemMap; block = block.Next)
{
if (offsetFromBlockStart >= block.ItemCount)
{
// item belongs to a later block, increment the containerIndex
containerIndex += block.ContainerCount;
offsetFromBlockStart -= block.ItemCount;
}
else
{
// item belongs to this block. Determine the container index and offset
if (block.ContainerCount > 0)
{
// block has realized items
position = new GeneratorPosition(containerIndex + offsetFromBlockStart, 0);
}
else
{
// block has unrealized items
position = new GeneratorPosition(containerIndex-1, offsetFromBlockStart+1);
}
break;
}
}
}
// Called when the items collection is refreshed
void OnRefresh()
{
((IItemContainerGenerator)this).RemoveAll();
// tell layout what happened
if (ItemsChanged != null)
{
GeneratorPosition position = new GeneratorPosition(0, 0);
ItemsChanged(this, new ItemsChangedEventArgs(NotifyCollectionChangedAction.Reset, position, 0, 0));
}
}
private GeneratorPosition FindPreviousUnrealizedGeneratorPosition( GeneratorPosition position )
{
int index = this.IndexFromGeneratorPosition( position ) - 1;
while( index >= 0 )
{
if( !m_genPosToIndex.Contains( index ) )
{
break;
}
index--;
}
GeneratorPosition retval = this.GeneratorPositionFromIndex( index );
return retval;
}
/// <summary>
/// Arrange Override
/// </summary>
protected override Size ArrangeOverride(Size finalSize)
{
// monitors changes to the ScrollViewer extent value
if (_oldExtent != _extent)
{
_oldExtent = _extent;
if (_scrollOwner != null)
_scrollOwner.InvalidateScrollInfo();
}
// monitors changes to the parent container size, (ie window resizes)
if (finalSize != _lastSize)
{
_lastSize = finalSize;
if (_scrollOwner != null)
_scrollOwner.InvalidateScrollInfo();
}
// monitor scrolling being removed
bool invalidateMeasure = false;
if (_extent.Width <= _viewPort.Width && _offset.X > 0)
{
_offset.X = 0;
_translateTransform.X = 0;
if (_scrollOwner != null)
_scrollOwner.InvalidateScrollInfo();
invalidateMeasure = true;
}
if (_extent.Height <= _viewPort.Height && _offset.Y > 0)
{
_offset.Y = 0;
_translateTransform.Y = 0;
if (_scrollOwner != null)
_scrollOwner.InvalidateScrollInfo();
invalidateMeasure = true;
}
if (invalidateMeasure)
InvalidateMeasure();
// arrange the children
double leftOrTop = 0;
for (int i = 0; i < InternalChildren.Count; i++)
{
UIElement child = InternalChildren[i];
GeneratorPosition childGeneratorPos = new GeneratorPosition(i, 0);
int itemIndex = this.ItemContainerGenerator.IndexFromGeneratorPosition(childGeneratorPos);
child.Arrange(_childRects[itemIndex]);
leftOrTop += (_tabStripPlacement == Dock.Top || _tabStripPlacement == Dock.Bottom) ? _childRects[i].Width : _childRects[i].Height;
}
// we need these lines as when the Scroll Buttons get Shown/Hidden,
// the _offset value gets out of line, this will ensure that our scroll position stays in line
if (InternalChildren.Count > 0)
{
_offset = _childRects[FirstVisibleIndex].TopLeft;
_translateTransform.X = -_offset.X;
_translateTransform.Y = -_offset.Y;
}
return finalSize;
}
protected override Size MeasureOverride(Size availableSize)
{
Size desiredSize = new Size();
UIElementCollection children = InternalChildren;
IItemContainerGenerator generator = ItemContainerGenerator;
int itemsCount = 0;
if (generator != null)
{
int StartItemIndex = navigationPane.GetFirstItemIndex(DisplayType);
if (StartItemIndex > -1)
{
int maxItems = DisplayType == NavigationPaneItemDisplayType.Large ? navigationPane.LargeItems : int.MaxValue;
GeneratorPosition startPos = new GeneratorPosition(-1, StartItemIndex + 1);
using (generator.StartAt(startPos, GeneratorDirection.Forward, true))
{
bool sizeExceeded = false;
bool newlyRealized;
UIElement child = null;
// temp fix for {Disconnected Item}
// needs more inspecting and documentation to fix it correctly !!
// but this for now seems to work... strange items present ??
// remove them, NOW !!!!!
//for (int j = children.Count - 1; j > -1; j--)
//{
//UIElement item = children[j];
//object o = navigationPane.ItemContainerGenerator.ItemFromContainer(item);
//if (o == DependencyProperty.UnsetValue)
// RemoveInternalChild(item);
//}
while (!sizeExceeded && (itemsCount < maxItems) && (child = generator.GenerateNext(out newlyRealized) as UIElement) != null)
{
bool isExcluded = NavigationPane.GetIsItemExcluded(child);
if (!isExcluded)
{
if (newlyRealized || !children.Contains(child))
{
int absoluteIndex = StartItemIndex + itemsCount;
int index = GetInsertIndex(absoluteIndex);
if (absoluteIndex < 9 && navigationPane.ItemsKeyAuto)
{
NavigationPaneItem f = child as NavigationPaneItem;
{
Window w = Window.GetWindow(child);
if (w != null)
{
KeyBinding binding = f.keyBinding;
if (binding != null)
w.InputBindings.Remove(binding);
f.keyBinding = new KeyBinding(NavigationPane.SelectItemCommand, Key.D1 + absoluteIndex, navigationPane.ItemsKeyModifiers);
f.keyBinding.CommandParameter = child;
f.keyBinding.CommandTarget = navigationPane;
w.InputBindings.Add(f.keyBinding);
if (f != null)
f.Gesture = (f.keyBinding.Gesture as KeyGesture).GetDisplayStringForCulture(CultureInfo.CurrentCulture);
}
}
}
SetActivePanel(child, this);
SetAbosluteIndex(child, absoluteIndex);
SetItemDisplayType(child, DisplayType);
if (newlyRealized)
generator.PrepareItemContainer(child);
InsertInternalChild(index, child);
}
#region measurament algoritm
Size childSize = new Size();
if (Orientation == Orientation.Vertical)
childSize = new Size(availableSize.Width, double.PositiveInfinity);
else
childSize = new Size(double.PositiveInfinity, availableSize.Height);
child.Measure(childSize);
if (Orientation == Orientation.Vertical)
{
sizeExceeded = desiredSize.Height + child.DesiredSize.Height > availableSize.Height;
if (!sizeExceeded)
{
desiredSize.Width = Math.Max(desiredSize.Width, child.DesiredSize.Width);
desiredSize.Height += child.DesiredSize.Height;
}
}
else
{
sizeExceeded = desiredSize.Width + child.DesiredSize.Width > availableSize.Width;
if (!sizeExceeded)
{
desiredSize.Width += child.DesiredSize.Width;
desiredSize.Height = Math.Max(desiredSize.Height, child.DesiredSize.Height);
}
}
#endregion
if (!sizeExceeded)
itemsCount++;
}
else
{
RemoveInternalChild(child);
}
}
}
CleanUpItems(StartItemIndex, itemsCount);
}
}
if(DisplayType == NavigationPaneItemDisplayType.Small)
navigationPane.SmallItems = itemsCount;
return desiredSize;
}
public CustomItemContainerGeneratorDisposableDisposer( CustomItemContainerGenerator generator, GeneratorPosition startGenPos, GeneratorDirection direction )
{
if( generator == null )
{
throw new ArgumentNullException( "generator" );
}
m_generator = generator;
m_generator.StartGenerator( startGenPos, direction );
}
private void CleanUpItems(int minDesiredGenerated, int maxDesiredGenerated)
{
var generator = ItemContainerGenerator;
for (var i = InternalChildren.Count - 1; i >= 0; i--)
{
var childGeneratorPos = new GeneratorPosition(i, 0);
var itemIndex = generator.IndexFromGeneratorPosition(childGeneratorPos);
if (itemIndex < minDesiredGenerated || itemIndex > maxDesiredGenerated)
{
RemoveInternalChildRange(i, 1);
generator.Remove(childGeneratorPos, 1);
}
}
}
private GeneratorPosition ConvertDetailGeneratorPosition( GeneratorPosition referencePosition, object masterItem, DetailGeneratorNode detailNode, out int globalIndex )
{
//If the requested generator position map past at least one generated item from the detail generator, then the job is easy...
if( referencePosition.Index >= 0 )
{
int generatorIndex = this.FindGeneratorIndexForNode( detailNode, referencePosition.Index );
// Ensure to return the globalIndex as -1
// if the generator index is not found for
// a DetailNode. This can occur if a Detail
// is filtered out via AutoFiltering.
globalIndex = ( generatorIndex > -1 )
? m_genPosToIndex[ generatorIndex ]
: globalIndex = -1;
return new GeneratorPosition( generatorIndex, referencePosition.Offset );
}
else
{
//This means the GeneratorPosition returned by the DetailGenerator is "before" any generated item from the detail generator.
//I need more complex detection of the GeneratorPosition.
// First - Get the Index of the MasterItem
int masterIndex = this.IndexFromItem( masterItem );
//Second - Get the DetailGenerator's Index for the DetailGenerator's GenPos
int detailGeneratorIndex = detailNode.DetailGenerator.IndexFromGeneratorPosition( referencePosition );
globalIndex = masterIndex + detailGeneratorIndex + 1;
// Finally - Have the Master Generator compute the GeneratorPosition from the sum of both
return this.GeneratorPositionFromIndex( globalIndex );
}
}
private void RemoveDetailContainers( GeneratorPosition convertedGeneratorPosition, int removeCount )
{
int removeGenPosIndex = convertedGeneratorPosition.Index;
if( convertedGeneratorPosition.Offset > 0 )
{
removeGenPosIndex++;
}
for( int i = 0; i < removeCount; i++ )
{
this.GenPosArraysRemoveAt( removeGenPosIndex );
}
}
private void HandleDetailReset( object masterItem, DetailGeneratorNode detailNode )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
int masterIndex = nodeHelper.FindItem( masterItem );
// -1 means either taht the master item is below a collapsed group node, or that the item does not exists, validate.
if( masterIndex == -1 )
{
nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( !nodeHelper.Contains( masterItem ) )
throw new DataGridInternalException();
}
ItemsGeneratorNode masterNode = nodeHelper.CurrentNode as ItemsGeneratorNode;
Debug.Assert( masterNode != null, "masterNode != null" );
#if LOG
Log.Assert( this, masterNode != null, "masterNode != null" );
#endif
//start index will be ignored later on if the masterIndex is -1!!
int startIndex = nodeHelper.Index + masterNode.IndexOf( masterItem ) + 1; //details start a master index + 1
List<DetailGeneratorNode> detailsForMaster = null;
//edge case, it is possible to receive a Reset from Floating details!
if( masterNode.Details == null )
{
//check for floating details, if not present, throw, this is an abnormal case.
if( !m_floatingDetails.Contains( masterItem ) )
{
throw new DataGridInternalException();
}
}
else
{
masterNode.Details.TryGetValue( masterNode.Items.IndexOf( masterItem ), out detailsForMaster );
Debug.Assert( detailsForMaster != null, "detailsForMaster != null" );
#if LOG
Log.Assert( this, detailsForMaster != null, "detailsForMaster != null" );
#endif
}
if( detailsForMaster != null )
{
//this is required to ensure that if the details that resets is not the first one, the index is calculated appropriatly.
foreach( DetailGeneratorNode node in detailsForMaster )
{
if( node == detailNode )
{
break;
}
else
{
startIndex += node.ItemCount;
}
}
//if there were 'items' in the detail node, process the remove of them
int oldDetailCount = detailNode.ItemCount;
if( oldDetailCount > 0 )
{
int endIndex = startIndex + oldDetailCount - 1; //last detail index
GeneratorPosition removeGenPos = ( masterIndex != -1 )
? this.GeneratorPositionFromIndex( startIndex )
: new GeneratorPosition( -1, 1 );
int genRemCount = 0;
List<DependencyObject> removedContainers = new List<DependencyObject>();
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
genRemCount = this.RemoveGeneratedItems( startIndex, endIndex, removedContainers );
}
masterNode.AdjustItemCount( -oldDetailCount );
this.IncrementCurrentGenerationCount();
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
this.SendRemoveEvent( removeGenPos, masterIndex + 1, oldDetailCount, genRemCount, removedContainers );
}
}
detailNode.UpdateItemCount();
int newDetailCount = detailNode.ItemCount;
if( newDetailCount > 0 )
{
GeneratorPosition addGenPos = new GeneratorPosition( -1, 1 );
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
addGenPos = this.GeneratorPositionFromIndex( startIndex );
}
masterNode.AdjustItemCount( newDetailCount );
this.IncrementCurrentGenerationCount();
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
this.SendAddEvent( addGenPos, masterIndex + 1, newDetailCount );
}
}
}
}
/// <summary>
/// Remove generated elements.
/// </summary>
void IItemContainerGenerator.Remove(GeneratorPosition position, int count)
{
Remove(position, count, /*isRecycling = */ false);
}
/// <summary>
/// Map a GeneratorPosition to an index into the items collection.
/// </summary>
int IItemContainerGenerator.IndexFromGeneratorPosition(GeneratorPosition position)
{
int index = position.Index;
if (index == -1)
{
// offset is relative to the fictitious boundary item
if (position.Offset >= 0)
{
return position.Offset - 1;
}
else
{
return ItemsInternal.Count + position.Offset;
}
}
if (_itemMap != null)
{
int itemIndex = 0; // number of items we've skipped over
// locate container at the given index
for (ItemBlock block = _itemMap.Next; block != _itemMap; block = block.Next)
{
if (index < block.ContainerCount)
{
// container is within this block. return the answer
return itemIndex + index + position.Offset;
}
else
{
// skip over this block
itemIndex += block.ItemCount;
index -= block.ContainerCount;
}
}
}
return -1;
}
/// <summary>
/// Remove generated elements.
/// </summary>
private void Remove(GeneratorPosition position, int count, bool isRecycling)
{
if (position.Offset != 0)
throw new ArgumentException(SR.Get(SRID.RemoveRequiresOffsetZero, position.Index, position.Offset), "position");
if (count <= 0)
throw new ArgumentException(SR.Get(SRID.RemoveRequiresPositiveCount, count), "count");
if (_itemMap == null)
{
// ignore reentrant call (during RemoveAllInternal)
Debug.Assert(false, "Unexpected reentrant call to ICG.Remove");
return;
}
int index = position.Index;
ItemBlock block;
// find the leftmost item to remove
int offsetL = index;
for (block = _itemMap.Next; block != _itemMap; block = block.Next)
{
if (offsetL < block.ContainerCount)
break;
offsetL -= block.ContainerCount;
}
RealizedItemBlock blockL = block as RealizedItemBlock;
// find the rightmost item to remove
int offsetR = offsetL + count - 1;
for (; block != _itemMap; block = block.Next)
{
if (!(block is RealizedItemBlock))
throw new InvalidOperationException(SR.Get(SRID.CannotRemoveUnrealizedItems, index, count));
if (offsetR < block.ContainerCount)
break;
offsetR -= block.ContainerCount;
}
RealizedItemBlock blockR = block as RealizedItemBlock;
// de-initialize the containers that are being removed
RealizedItemBlock rblock = blockL;
int offset = offsetL;
while (rblock != blockR || offset <= offsetR)
{
DependencyObject container = rblock.ContainerAt(offset);
UnlinkContainerFromItem(container, rblock.ItemAt(offset));
// DataGrid generates non-GroupItem for NewItemPlaceHolder
// Dont recycle in this case.
bool isNewItemPlaceHolderWhenGrouping = _generatesGroupItems && !(container is GroupItem);
if (isRecycling && !isNewItemPlaceHolderWhenGrouping)
{
Debug.Assert(!_recyclableContainers.Contains(container), "trying to add a container to the collection twice");
if (_containerType == null)
{
_containerType = container.GetType();
}
else if (_containerType != container.GetType())
{
throw new InvalidOperationException(SR.Get(SRID.CannotRecyleHeterogeneousTypes));
}
_recyclableContainers.Enqueue(container);
}
if (++offset >= rblock.ContainerCount && rblock != blockR)
{
rblock = rblock.Next as RealizedItemBlock;
offset = 0;
}
}
// see whether the range hits the edge of a block on either side,
// and whether the a`butting block is an unrealized gap
bool edgeL = (offsetL == 0);
bool edgeR = (offsetR == blockR.ItemCount-1);
bool abutL = edgeL && (blockL.Prev is UnrealizedItemBlock);
bool abutR = edgeR && (blockR.Next is UnrealizedItemBlock);
// determine the target (unrealized) block,
// the offset within the target at which to insert items,
// and the intial change in cumulative item count
UnrealizedItemBlock blockT;
ItemBlock predecessor = null;
int offsetT;
int deltaCount;
if (abutL)
{
blockT = (UnrealizedItemBlock)blockL.Prev;
offsetT = blockT.ItemCount;
deltaCount = -blockT.ItemCount;
}
else if (abutR)
{
blockT = (UnrealizedItemBlock)blockR.Next;
offsetT = 0;
deltaCount = offsetL;
}
else
{
blockT = new UnrealizedItemBlock();
offsetT = 0;
deltaCount = offsetL;
// remember where the new block goes, so we can insert it later
predecessor = (edgeL) ? blockL.Prev : blockL;
}
// move items within the range to the target block
for (block = blockL; block != blockR; block = block.Next)
{
int itemCount = block.ItemCount;
MoveItems(block, offsetL, itemCount-offsetL,
blockT, offsetT, deltaCount);
offsetT += itemCount-offsetL;
offsetL = 0;
deltaCount -= itemCount;
if (block.ItemCount == 0)
block.Remove();
}
// the last block in the range is a little special...
// Move the last unrealized piece.
int remaining = block.ItemCount - 1 - offsetR;
MoveItems(block, offsetL, offsetR - offsetL + 1,
blockT, offsetT, deltaCount);
// Move the remaining realized items
RealizedItemBlock blockX = blockR;
if (!edgeR)
{
if (blockL == blockR && !edgeL)
{
blockX = new RealizedItemBlock();
}
MoveItems(block, offsetR+1, remaining,
blockX, 0, offsetR+1);
}
// if we created any new blocks, insert them in the list
if (predecessor != null)
blockT.InsertAfter(predecessor);
if (blockX != blockR)
blockX.InsertAfter(blockT);
RemoveAndCoalesceBlocksIfNeeded(block);
}
// Token: 0x06005E4F RID: 24143 RVA: 0x001A7404 File Offset: 0x001A5604
internal ItemsChangedEventArgs(NotifyCollectionChangedAction action, GeneratorPosition position, GeneratorPosition oldPosition, int itemCount, int itemUICount)
{
this._action = action;
this._position = position;
this._oldPosition = oldPosition;
this._itemCount = itemCount;
this._itemUICount = itemUICount;
}
void IRecyclingItemContainerGenerator.Recycle(GeneratorPosition position, int count)
{
Remove(position, count, /*isRecyling = */ true);
}
// Token: 0x06005E50 RID: 24144 RVA: 0x001A7431 File Offset: 0x001A5631
internal ItemsChangedEventArgs(NotifyCollectionChangedAction action, GeneratorPosition position, int itemCount, int itemUICount) : this(action, position, new GeneratorPosition(-1, 0), itemCount, itemUICount)
{
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
internal Generator(ItemContainerGenerator factory, GeneratorPosition position, GeneratorDirection direction, bool allowStartAtRealizedItem)
{
_factory = factory;
_direction = direction;
_factory.MapChanged += new MapChangedHandler(OnMapChanged);
_factory.MoveToPosition(position, direction, allowStartAtRealizedItem, ref _cachedState);
_done = (_factory.ItemsInternal.Count == 0);
_factory.SetStatus(GeneratorStatus.GeneratingContainers);
}
/// <summary> Begin generating at the given position and direction </summary>
/// <remarks>
/// This method must be called before calling GenerateNext. It returns an
/// IDisposable object that tracks the lifetime of the generation loop.
/// This method sets the generator's status to GeneratingContent; when
/// the IDisposable is disposed, the status changes to ContentReady or
/// Error, as appropriate.
/// </remarks>
IDisposable IItemContainerGenerator.StartAt(GeneratorPosition position, GeneratorDirection direction, bool allowStartAtRealizedItem)
{
if (_generator != null)
throw new InvalidOperationException(SR.Get(SRID.GenerationInProgress));
_generator = new Generator(this, position, direction, allowStartAtRealizedItem);
return _generator;
}
/// <summary>
/// Virtualize hidden items
/// </summary>
private void CleanUpItems()
{
try
{
UIElementCollection children = this.InternalChildren;
IItemContainerGenerator generator = this.ItemContainerGenerator;
for (int i = children.Count - 1; i >= 0; i--)
{
GeneratorPosition childGeneratorPos = new GeneratorPosition(i, 0);
int itemIndex = generator.IndexFromGeneratorPosition(childGeneratorPos);
if (itemIndex == -1)
continue;
if (itemIndex < FirstVisibleIndex || itemIndex > LastVisibleIndex)
{
generator.Remove(childGeneratorPos, 1);
RemoveInternalChildRange(i, 1);
}
}
}
catch (Exception ex)
{
VMuktiAPI.VMuktiHelper.ExceptionHandler(ex, "CleanUpItems()", "Controls\\VMuktiGrid\\Page\\VirtualizingTabPanel.cs");
}
}
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
void MoveToPosition(GeneratorPosition position, GeneratorDirection direction, bool allowStartAtRealizedItem, ref GeneratorState state)
{
ItemBlock block = _itemMap;
if (block == null)
return; // this can happen in event-leapfrogging situations (Dev11 283413)
int itemIndex = 0;
// first move to the indexed (realized) item
if (position.Index != -1)
{
// find the right block
int itemCount = 0;
int index = position.Index;
block = block.Next;
while (index >= block.ContainerCount)
{
itemCount += block.ItemCount;
index -= block.ContainerCount;
itemIndex += block.ItemCount;
block = block.Next;
}
// set the position
state.Block = block;
state.Offset = index;
state.Count = itemCount;
state.ItemIndex = itemIndex + index;
}
else
{
state.Block = block;
state.Offset = 0;
state.Count = 0;
state.ItemIndex = itemIndex - 1;
}
// adjust the offset - we always set the state so it points to the next
// item to be generated.
int offset = position.Offset;
if (offset == 0 && (!allowStartAtRealizedItem || state.Block == _itemMap))
{
offset = (direction == GeneratorDirection.Forward) ? 1 : -1;
}
// advance the state according to the offset
if (offset > 0)
{
state.Block.MoveForward(ref state, true);
-- offset;
while (offset > 0)
{
offset -= state.Block.MoveForward(ref state, allowStartAtRealizedItem, offset);
}
}
else if (offset < 0)
{
if (state.Block == _itemMap)
{
state.ItemIndex = state.Count = ItemsInternal.Count;
}
state.Block.MoveBackward(ref state, true);
++ offset;
while (offset < 0)
{
offset += state.Block.MoveBackward(ref state, allowStartAtRealizedItem, -offset);
}
}
}
private void CleanUpItems(int StartItemIndex, int itemsCount)
{
UIElementCollection children = InternalChildren;
IItemContainerGenerator generator = ItemContainerGenerator;
int first = StartItemIndex;
int last = StartItemIndex + itemsCount - 1;
for (int i = children.Count - 1; i >= 0; i--)
{
// Map a child index to an item index by going through a generator position
GeneratorPosition childGeneratorPos = new GeneratorPosition(i, 0);
int itemIndex = generator.IndexFromGeneratorPosition(childGeneratorPos);
itemIndex = i + StartItemIndex;
if (itemIndex < first || itemIndex > last)
{
//generator.Remove(childGeneratorPos, 1);
//generator.Remove(new GeneratorPosition(itemIndex, 0), 1);
RemoveInternalChildRange(i, 1);
}
}
}
/// <summary> Begin generating at the given position and direction </summary>
/// <remarks>
/// This method must be called before calling GenerateNext. It returns an
/// IDisposable object that tracks the lifetime of the generation loop.
/// This method sets the generator's status to GeneratingContent; when
/// the IDisposable is disposed, the status changes to ContentReady or
/// Error, as appropriate.
/// </remarks>
IDisposable IItemContainerGenerator.StartAt(GeneratorPosition position, GeneratorDirection direction)
{
return ((IItemContainerGenerator)this).StartAt(position, direction, false);
}
