private void TagBlockCloned(object sender, TagBlockClonedEventArgs e)
{
FlattenedTagBlock flattened = _flattenInfo[e.Old];
AttachToTagBlock(e.Clone, flattened);
flattened.SynchronizeWith(e.Clone);
}
private void TagBlockPropertyChanged(object sender, PropertyChangedEventArgs e)
{
var block = (TagBlockData)sender;
FlattenedTagBlock flattenedField = _flattenInfo[block];
if (e.PropertyName == "IsExpanded")
{
if (block.IsExpanded)
{
flattenedField.Expand();
}
else
{
flattenedField.Contract();
}
}
else if (!_loading &&
(e.PropertyName == "CurrentIndex" || e.PropertyName == "FirstElementAddress" || e.PropertyName == "ElementSize"))
{
_loading = true;
_tracker.Enabled = false;
if (e.PropertyName == "FirstElementAddress")
{
// Throw out any cached changes and reset the current index
RecursiveReset(flattenedField.LoadedFields);
if (block.Length > 0)
{
block.CurrentIndex = 0;
}
else
{
block.CurrentIndex = -1;
}
}
else
{
// Cache any changes made to the current page
RecursiveUnload(flattenedField.LoadedFields);
}
// Load the new page in
flattenedField.LoadPage(block, block.CurrentIndex);
// Read any non-cached fields in the page
_reader.ReadTagBlockChildren(block);
RecursiveLoad(flattenedField.LoadedFields);
_tracker.Enabled = true;
_loading = false;
}
}
private void RecursiveLoad(IEnumerable <MetaField> fields)
{
foreach (MetaField field in fields)
{
var block = field as TagBlockData;
if (block != null)
{
FlattenedTagBlock flattened = _flattenInfo[block];
_flattenInfo[block].LoadPage(block, block.CurrentIndex);
RecursiveLoad(flattened.LoadedFields);
}
}
}
public WrappedTagBlockEntry GetTopLevelWrapper(WrappedTagBlockEntry wrapper)
{
WrappedTagBlockEntry result = wrapper;
FlattenedTagBlock block = _parent;
while (block != null)
{
int index = block._template.Template.IndexOf(result);
result = block._wrappers[index];
block = block._parent;
}
return(result);
}
private void RecursiveReset(IEnumerable <MetaField> fields)
{
foreach (MetaField field in fields)
{
_tracker.MarkUnchanged(field);
var block = field as TagBlockData;
if (block != null)
{
FlattenedTagBlock flattened = _flattenInfo[block];
RecursiveReset(flattened.LoadedFields);
block.ResetPages();
}
}
}
public FlattenedTagBlock(FlattenedTagBlock parent, TagBlockData template,
ObservableCollection <MetaField> topLevelFields, FieldChangeTracker tracker, FieldChangeSet changes)
{
_parent = parent;
_template = template;
_activeTagBlock = template;
_synchronizedTagBlocks.Add(template);
if (template.HasChildren)
{
_lastPage = template.Pages[template.CurrentIndex];
}
_topLevelFields = topLevelFields;
_tracker = tracker;
_changes = changes;
}
private void HideFields(FlattenedTagBlock block, int start, int end)
{
if (end <= start)
{
return;
}
if (block != null)
{
int baseIndex = block._template.Template.IndexOf(_template) + 1;
if (block._expanded)
{
block.HideFields(block._parent, baseIndex + start, baseIndex + end);
}
bool adjustLast = false;
for (int i = start; i < end; i++)
{
block._fieldVisibility[baseIndex + i] = false;
if (block._wrappers[baseIndex + i].IsLast)
{
block._wrappers[baseIndex + i].IsLast = false;
adjustLast = true;
}
}
if (adjustLast && start + baseIndex > 0)
{
int lastVisible = block._fieldVisibility.FindLastIndex(start + baseIndex - 1, v => v);
if (lastVisible >= 0)
{
block._wrappers[lastVisible].IsLast = true;
}
}
}
else
{
int baseIndex = _topLevelFields.IndexOf(_template) + 1 + GetVisibleFieldOffset(start);
for (int i = start; i < end; i++)
{
if (_fieldVisibility[i])
{
_topLevelFields.RemoveAt(baseIndex);
}
}
}
}
private void ShowFields(FlattenedTagBlock block, int start, int end)
{
if (end <= start)
{
return;
}
if (block != null)
{
// Set the visibility of everything
int baseIndex = block._template.Template.IndexOf(_template) + 1;
for (int i = start; i < end; i++)
{
block._fieldVisibility[baseIndex + i] = _fieldVisibility[i];
}
// Update the IsLast states in case we added wrappers after the "last" one
if (baseIndex + start > 0 && block._wrappers[baseIndex + start - 1].IsLast)
{
int lastVisible = block._fieldVisibility.FindLastIndex(v => v);
if (lastVisible >= 0)
{
block._wrappers[baseIndex + start - 1].IsLast = false;
block._wrappers[lastVisible].IsLast = true;
}
}
// Recurse through ancestors if we're expanded
if (block._expanded)
{
block.ShowFields(block._parent, baseIndex + start, baseIndex + end);
}
}
else
{
// Insert our fields into the top-level
int insertIndex = _topLevelFields.IndexOf(_template) + 1 + GetVisibleFieldOffset(start);
for (int i = start; i < end; i++)
{
if (_fieldVisibility[i])
{
_topLevelFields.Insert(insertIndex, _wrappers[i]);
insertIndex++;
}
}
}
}
public void VisitTagBlock(TagBlockData field)
{
// Create flatten information for the block and attach event handlers to it
var flattened = new FlattenedTagBlock(_flatParent, field, _topLevelFields, _tracker, _changes);
AttachToTagBlock(field, flattened);
FlattenedTagBlock oldParent = _flatParent;
_flatParent = flattened;
Flatten(field.Template);
field.UpdateWidth();
_flatParent = oldParent;
for (int i = 0; i < field.Template.Count; i++)
{
WrappedTagBlockEntry wrapper = flattened.WrapField(field.Template[i], field.Width, i == field.Template.Count - 1);
_index++;
_fields.Insert(_index, wrapper);
}
}
private void AttachToTagBlock(TagBlockData field, FlattenedTagBlock flattened)
{
field.PropertyChanged += TagBlockPropertyChanged;
field.Cloned += TagBlockCloned;
_flattenInfo[field] = flattened;
}