// Tries to figure out what property to select and selects is
private void UpdateSelectedProperty(View.Selection selection)
{
// If we are not loaded, skip any and all selection magic
if (!this.IsLoaded)
{
return;
}
if (selection != null)
{
// See what the view would like us to select if we run out of things
// we can think of selecting
//
SelectionPath fallbackSelection = null;
if (_propertyToolBar.CurrentViewManager != null)
{
fallbackSelection = _propertyToolBar.CurrentViewManager.GetDefaultSelectionPath(_categoryList);
}
// Select the first thing we request that exists, using the following
// precedence order:
//
// * LastSelectionPath
// * DefaultProperty
// * Whatever the view wants to show (first category, first property, ...)
//
_categoryList.UpdateSelectedProperty(
this.LastSelectionPath,
ModelPropertyMerger.GetMergedDefaultProperty(selection.SelectedObjects),
fallbackSelection);
}
if (DesignerPerfEventProvider != null)
{
DesignerPerfEventProvider.PropertyInspectorUpdatePropertyListEnd();
}
}
// This is the work-horse that refreshes the list of properties and categories within a PropertyInspector
// window, including refreshing of CategoryEditors, based on the specified selection
private void UpdateCategories(View.Selection selection, bool attachedOnly)
{
// Optimization stolen from Sparkle:
// re-rendering the categories is the number one perf issue. Clearing
// the databound collection results in massive Avalon code execution, and
// then re-adding everything causes another huge shuffle. What is more,
// even when changing the selection between different objects, most properties
// do not change. Therefore we are going to take the new list of properties
// and we are going to merge them into the existing stuff, using an
// approach I call Mark, Match, and Cull.
//
// First we mark all the properties in the current collection. Those which
// are still marked at the end will be culled out
foreach (ModelCategoryEntry category in _categoryList)
{
if (attachedOnly)
{
category.MarkAttachedPropertiesDisassociated();
}
else
{
category.MarkAllPropertiesDisassociated();
}
}
// Second we try to match each property in the list of properties for the newly selected objects
// against something that we already have. If we have a match, then we reset the existing
// ModelPropertyEntry and clear the mark
//
foreach (IEnumerable<ModelProperty> propertySet in
ModelPropertyMerger.GetMergedProperties(
selection == null ? null : selection.SelectedObjects,
selection == null ? 0 : selection.SelectionCount))
{
string propertyName = GetPropertyName(propertySet);
// Specifically filter out the Name property
// PS 40699 - Name is not a special property for WF
//if ("Name".Equals(propertyName))
//{
// continue;
//}
if (attachedOnly && propertyName.IndexOf('.') < 0)
{
continue;
}
ModelPropertyEntry wrappedProperty = _propertyToolBar.CurrentViewManager.AddProperty(propertySet, propertyName, _categoryList);
// Make sure no valid properties get culled out
wrappedProperty.Disassociated = false;
}
// Third, we walk the properties and categories, and we cull out all of the
// marked properties. Empty categories are removed.
//
for (int i = _categoryList.Count - 1; i >= 0; i--)
{
ModelCategoryEntry category = (ModelCategoryEntry)_categoryList[i];
category.CullDisassociatedProperties();
if (category.IsEmpty)
{
_categoryList.RemoveAt(i);
}
}
_categoryList.RefreshFilter();
}
// Helper method that adjusts the visible set of CategoryEditors based on the specified selection
private void UpdateCategoryEditors(View.Selection selection)
{
// Figure out which category editors to show
Dictionary<Type, object> newCategoryEditorTypes = _propertyToolBar.CurrentViewManager.GetCategoryEditors(
FindCommonType(selection == null ? null : selection.SelectedObjects),
_categoryList);
// Figure out which CategoryEditors are no longer needed and remove them
List<Type> editorTypesToRemove = null;
foreach (KeyValuePair<Type, string> item in _activeCategoryEditors)
{
if (!newCategoryEditorTypes.ContainsKey(item.Key) || !IsCategoryShown(item.Key))
{
// New selection does not include this existing category editor
// or the category that contains this editor
// so remove the editor.
if (editorTypesToRemove == null)
{
editorTypesToRemove = new List<Type>();
}
editorTypesToRemove.Add(item.Key);
}
else
{
// This category editor already exists, so don't re-add it
newCategoryEditorTypes.Remove(item.Key);
}
}
if (editorTypesToRemove != null)
{
foreach (Type editorTypeToRemove in editorTypesToRemove)
{
ModelCategoryEntry affectedCategory = _categoryList.FindCategory(_activeCategoryEditors[editorTypeToRemove]) as ModelCategoryEntry;
if (affectedCategory != null)
{
affectedCategory.RemoveCategoryEditor(editorTypeToRemove);
}
_activeCategoryEditors.Remove(editorTypeToRemove);
}
}
// Figure out which CategoryEditors are now required and add them
foreach (Type editorTypeToAdd in newCategoryEditorTypes.Keys)
{
CategoryEditor editor = (CategoryEditor)ExtensibilityAccessor.SafeCreateInstance(editorTypeToAdd);
if (editor == null)
{
continue;
}
ModelCategoryEntry affectedCategory = _categoryList.FindCategory(editor.TargetCategory) as ModelCategoryEntry;
if (affectedCategory == null)
{
continue;
}
affectedCategory.AddCategoryEditor(editor);
_activeCategoryEditors[editorTypeToAdd] = editor.TargetCategory;
}
}
private static bool AreSelectionsEquivalent(View.Selection a, View.Selection b)
{
if (a == null && b == null)
{
return true;
}
if (a == null || b == null)
{
return false;
}
if (a.SelectionCount != b.SelectionCount)
{
return false;
}
// POSSIBLE OPTIMIZATION: be smarter about same selection in a different order
IEnumerator<ModelItem> ea = a.SelectedObjects.GetEnumerator();
IEnumerator<ModelItem> eb = b.SelectedObjects.GetEnumerator();
while (ea.MoveNext() && eb.MoveNext())
{
if (!object.Equals(ea.Current, eb.Current))
{
return false;
}
}
return true;
}
// The user can only specify the name for the selected objects iff exactly one
// object is selected.
private static bool CanSetSelectionName(View.Selection selection)
{
return selection != null && selection.SelectionCount == 1;
}
// Looks for common parent ModelItem among all the items in the selection
private static ModelItem GetCommonParent(View.Selection selection)
{
if (selection == null || selection.SelectionCount < 1)
{
return null;
}
ModelItem parent = null;
foreach (ModelItem item in selection.SelectedObjects)
{
if (parent == null)
{
parent = item.Parent;
}
else if (parent != item.Parent)
{
return null;
}
}
return parent;
}
// Removes / adds a PropertyChanged listener from / to the previous / current selection
private void UpdateSelectionPropertyChangedEventHooks(View.Selection previousSelection, View.Selection currentSelection)
{
if (previousSelection != null && previousSelection.PrimarySelection != null)
{
previousSelection.PrimarySelection.PropertyChanged -= OnSelectedItemPropertyChanged;
}
if (currentSelection != null && currentSelection.PrimarySelection != null)
{
currentSelection.PrimarySelection.PropertyChanged += OnSelectedItemPropertyChanged;
}
}
// Selection Logic
// SelectionPathStateContainer
// <summary>
// Called externally whenever selection changes
// </summary>
// <param name="selection">New selection</param>
public void OnSelectionChanged(View.Selection selection)
{
_lastNotifiedSelection = selection;
RefreshSelection();
}