public GroupGeneratorNode(CollectionViewGroup group, GeneratorNode parent, GroupConfiguration groupConfig)
: base(parent)
{
Debug.Assert(group != null, "group cannot be null for GroupGeneratorNode");
Debug.Assert(groupConfig != null);
m_group = group;
m_groupConfig = groupConfig;
}
static GroupConfiguration()
{
GroupConfiguration.HeadersProperty = GroupConfiguration.HeadersPropertyKey.DependencyProperty;
GroupConfiguration.FootersProperty = GroupConfiguration.FootersPropertyKey.DependencyProperty;
DefaultHeaderTemplate = new GroupHeaderFooterItemTemplate();
DefaultHeaderTemplate.VisibleWhenCollapsed = true;
DefaultHeaderTemplate.Template = new DataTemplate();
DefaultHeaderTemplate.Template.VisualTree = new FrameworkElementFactory(typeof(GroupHeaderControl));
DefaultHeaderTemplate.Template.Seal();
DefaultHeaderTemplate.Seal();
DefaultGroupConfiguration = new GroupConfiguration();
DefaultGroupConfiguration.AddDefaultHeadersFooters();
DefaultGroupConfiguration.Freeze();
}
private readonly WeakReference m_dataGridControl; //null
#endregion
public GeneratorNode CreateGroupGeneratorNode(
CollectionViewGroup collectionViewGroup,
GeneratorNode parent,
GeneratorNode previous,
GeneratorNode next,
GroupConfiguration groupConfig)
{
Debug.Assert(collectionViewGroup != null, "collectionViewGroup cannot be null for CreateGroupGeneratorNode()");
GroupGeneratorNode node = new GroupGeneratorNode(collectionViewGroup, parent, groupConfig);
if (previous != null)
{
previous.Next = node;
}
node.Previous = previous;
if (next != null)
{
next.Previous = node;
}
node.Next = next;
node.IsExpanded = groupConfig.InitiallyExpanded;
if (!collectionViewGroup.IsBottomLevel)
{
this.RegisterNodeCollectionChanged(
( INotifyCollectionChanged )collectionViewGroup.GetItems(),
new NotifyCollectionChangedEventHandler(node.OnCollectionChanged));
node.CollectionChanged += m_groupsChangedHandler;
}
node.ExpansionStateChanged += m_expansionStateChangedHandler;
node.IsExpandedChanging += m_isExpandedChangingHandler;
node.IsExpandedChanged += m_isExpandedChangedHandler;
node.AdjustItemCount(node.ItemCount);
node.BuildNamesTree();
return(node);
}
internal static GroupConfiguration GetGroupConfiguration(DataGridContext dataGridContext, ObservableCollection <GroupDescription> groupDescriptions, GroupConfigurationSelector groupConfigSelector, int groupLevel, CollectionViewGroup collectionViewGroup)
{
if (dataGridContext == null)
{
throw new ArgumentNullException("dataGridContext");
}
if (groupDescriptions == null)
{
throw new ArgumentNullException("groupDescriptions");
}
if (groupLevel >= groupDescriptions.Count)
{
throw new ArgumentException("The specified group level is greater than the number of GroupDescriptions in the DataGridContext.", "groupLevel");
}
GroupDescription groupDescription = groupDescriptions[groupLevel];
GroupConfiguration retval = null;
DataGridGroupDescription dataGridGroupDescription = groupDescription as DataGridGroupDescription;
if ((dataGridGroupDescription != null) && (dataGridGroupDescription.GroupConfiguration != null))
{
retval = dataGridGroupDescription.GroupConfiguration;
}
else if (groupConfigSelector != null)
{
retval = groupConfigSelector.SelectGroupConfiguration(groupLevel, collectionViewGroup, groupDescription);
}
if (retval == null)
{
retval = dataGridContext.DefaultGroupConfiguration;
}
if (retval == null)
{
retval = GroupConfiguration.DefaultGroupConfiguration;
}
return(retval);
}
protected override Size MeasureOverride(Size availableSize)
{
var panel = this.GroupLevelIndicatorPaneHost;
var dataGridContext = DataGridControl.GetDataGridContext(this);
if ((panel == null) || (dataGridContext == null))
{
return(base.MeasureOverride(availableSize));
}
var groupDescriptions = DataGridContext.GetGroupDescriptionsHelper(dataGridContext.Items);
var leafGroupLevel = GroupLevelIndicatorPane.GetGroupLevel(this);
// If Indented is true (default), we use the total groupDescriptions.Count for this DataGridContext
var correctedGroupLevel = (this.Indented == true) ? groupDescriptions.Count : leafGroupLevel;
// Ensure that the GroupLevel retrieved does not eNequeos the number of group descriptions for the DataGridContext
correctedGroupLevel = System.Math.Min(correctedGroupLevel, groupDescriptions.Count);
// Then finally, if the GroupLevel is -1, then indent at maximum.
if (correctedGroupLevel == -1)
{
correctedGroupLevel = groupDescriptions.Count;
}
if ((correctedGroupLevel > 0) && (this.AreGroupsFlattened))
{
correctedGroupLevel = (this.Indented) ? 1 : 0;
}
var children = panel.Children;
var childrenCount = children.Count;
// If we need to add/remove GroupLevelIndicators from the panel
if (correctedGroupLevel != childrenCount)
{
// When grouping change, we take for granted that the group deepness will change,
// so we initialize DataContext of the margin only in there.
// Clear all the panel's children!
children.Clear();
// Create 1 group margin content presenter for each group level
for (int i = correctedGroupLevel - 1; i >= 0; i--)
{
GroupLevelIndicator groupMargin = new GroupLevelIndicator();
groupMargin.DataContext = dataGridContext.GroupLevelDescriptions[i];
children.Insert(0, new GroupLevelIndicator());
}
childrenCount = correctedGroupLevel;
this.SetCurrentIndicatorCount(childrenCount);
this.InvalidateGroupLevelIndicatorPaneHostPanelMeasure();
}
var item = dataGridContext.GetItemFromContainer(this);
for (int i = 0; i < childrenCount; i++)
{
GroupLevelIndicator groupMargin = children[i] as GroupLevelIndicator;
CollectionViewGroup groupForIndicator = GroupLevelIndicatorPane.GetCollectionViewGroupHelper(
dataGridContext, groupDescriptions, item, i);
GroupConfiguration groupLevelConfig = GroupConfiguration.GetGroupConfiguration(
dataGridContext, groupDescriptions, dataGridContext.GroupConfigurationSelector, i, groupForIndicator);
if (groupLevelConfig != null)
{
Binding groupLevelIndicatorStyleBinding = BindingOperations.GetBinding(groupMargin, GroupLevelIndicator.StyleProperty);
if ((groupLevelIndicatorStyleBinding == null) || (groupLevelIndicatorStyleBinding.Source != groupLevelConfig))
{
groupLevelIndicatorStyleBinding = new Binding("GroupLevelIndicatorStyle");
groupLevelIndicatorStyleBinding.Source = groupLevelConfig;
// Use a Converter to manage groupLevelConfig.GroupLevelIndicatorStyle == null
// so that an implicit syle won't be overriden by a null style.
groupLevelIndicatorStyleBinding.Converter = new GroupLevelIndicatorConverter();
groupLevelIndicatorStyleBinding.ConverterParameter = groupMargin;
groupMargin.SetBinding(GroupLevelIndicator.StyleProperty, groupLevelIndicatorStyleBinding);
}
}
else
{
groupMargin.ClearValue(GroupLevelIndicator.StyleProperty);
}
// If the ShowIndicators property is False or there is already leafGroupLevel GroupLevelIndicators in the panel,
// the current newGroupMargin must be hidden.
if ((!GroupLevelIndicatorPane.GetShowIndicators(this)) || ((i >= leafGroupLevel) && (leafGroupLevel != -1)))
{
groupMargin.Visibility = Visibility.Hidden;
}
else
{
groupMargin.Visibility = Visibility.Visible;
}
}
return(base.MeasureOverride(availableSize));
}
