private static void OnDataGridContextChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
GroupLevelIndicatorPane self = sender as GroupLevelIndicatorPane;
if (self != null)
{
DataGridContext dataGridContext = e.OldValue as DataGridContext;
//unregister to the old contexts Collection GroupDescriptions Changed event
if (dataGridContext != null)
{
CollectionChangedEventManager.RemoveListener(dataGridContext.Items.GroupDescriptions, self);
}
dataGridContext = e.NewValue as DataGridContext;
//register to the new contexts Collection GroupDescriptions Changed event
if (dataGridContext != null)
{
CollectionChangedEventManager.AddListener(dataGridContext.Items.GroupDescriptions, self);
self.PrepareDefaultStyleKey(dataGridContext.DataGridControl.GetView());
}
self.InvalidateMeasure();
}
}
protected override Size MeasureOverride(Size availableSize)
{
Panel panel = this.GroupLevelIndicatorPaneHost;
if (panel != null)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
if (dataGridContext != null)
{
if (this.GroupLevelIndicatorPaneNeedsRefresh)
{
//clear all the panel's children!
panel.Children.Clear();
DataGridContext previousContext = dataGridContext;
DataGridContext runningDataGridContext = dataGridContext.ParentDataGridContext;
while (runningDataGridContext != null)
{
//create a GroupLevelIndicator to create indentation between the GLIPs
FrameworkElement newGroupMargin = null;
newGroupMargin = new DetailIndicator();
newGroupMargin.DataContext = dataGridContext;
object bindingSource = dataGridContext.GetDefaultDetailConfigurationForContext();
if (bindingSource == null)
{
bindingSource = dataGridContext.SourceDetailConfiguration;
}
//Bind the GroupLevelIndicator`s style to the running DataGridContext`s GroupLevelIndicatorStyle.
Binding groupLevelIndicatorStyleBinding = new Binding();
groupLevelIndicatorStyleBinding.Path = new PropertyPath(DetailConfiguration.DetailIndicatorStyleProperty);
groupLevelIndicatorStyleBinding.Source = bindingSource;
newGroupMargin.SetBinding(StyleProperty, groupLevelIndicatorStyleBinding);
//insert the Spacer GroupLevelIndicator in the panel
panel.Children.Insert(0, newGroupMargin);
if (!runningDataGridContext.AreDetailsFlatten)
{
//then create the GLIP for the running DataGridContext
GroupLevelIndicatorPane newSubGLIP = new GroupLevelIndicatorPane();
DataGridControl.SetDataGridContext(newSubGLIP, runningDataGridContext);
newSubGLIP.SetIsLeaf(false);
GroupLevelIndicatorPane.SetGroupLevel(newSubGLIP, -1);
//and insert it in the panel.
panel.Children.Insert(0, newSubGLIP);
}
previousContext = runningDataGridContext;
runningDataGridContext = runningDataGridContext.ParentDataGridContext;
} //end of the loop to cycle through the parent contexts.
} // end if GroupLevelIndicatorPaneNeedsRefresh
} // end if dataGridContext != null
} //end if panel is not null
return(base.MeasureOverride(availableSize));
}
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));
}
