private void CreateItemCollectionAndGenerator()
{
_items = new ItemCollection(this);
// the generator must attach its collection change handler before
// the control itself, so that the generator is up-to-date by the
// time the control tries to use it (bug 892806 et al.)
_itemContainerGenerator = new ItemContainerGenerator(this);
_itemContainerGenerator.ChangeAlternationCount();
((INotifyCollectionChanged)_items).CollectionChanged += new NotifyCollectionChangedEventHandler(OnItemCollectionChanged);
if (IsInitPending)
{
_items.BeginInit();
}
else if (IsInitialized)
{
_items.BeginInit();
_items.EndInit();
}
((INotifyCollectionChanged)_groupStyle).CollectionChanged += new NotifyCollectionChangedEventHandler(OnGroupStyleChanged);
}
private ItemContainerGenerator(ItemContainerGenerator parent, IGeneratorHost host, DependencyObject peer, int level)
{
_parent = parent;
_host = host;
_peer = peer;
_level = level;
OnRefresh();
}
public VisualCommentsHelper(Dispatcher disp, ItemContainerGenerator gen, Comment placeholder)
{
_gen = gen;
_placeholder = placeholder;
disp.BeginInvoke(new Action(DeferredFocusSet),
System.Windows.Threading.DispatcherPriority.Background, null);
}
/// <summary>
/// Selects the tree view item.
/// </summary>
/// <param name="owningItemGenerator">The owning item generator.</param>
/// <param name="dataItem">The data item.</param>
public static void SelectTreeViewItem(ItemContainerGenerator owningItemGenerator, object dataItem)
{
if (owningItemGenerator == null) return;
var treeViewItem = owningItemGenerator.ContainerFromItem(dataItem) as TreeViewItem;
if (treeViewItem != null)
{
treeViewItem.IsSelected = true;
}
}
/// <summary>
/// Expands the tree view item.
/// </summary>
/// <param name="owningItemGenerator">The owning item generator.</param>
/// <param name="dataItem">The data item.</param>
/// <returns></returns>
public static TreeViewItem ExpandTreeViewItem(ItemContainerGenerator owningItemGenerator, object dataItem)
{
if (owningItemGenerator == null) return null;
var treeViewItem = owningItemGenerator.ContainerFromItem(dataItem) as TreeViewItem;
if (treeViewItem != null)
{
treeViewItem.IsExpanded = true;
}
return treeViewItem;
}
private static TreeViewItem ContainerFromItem(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, object item)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem parentContainer = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
TreeViewItem containerThatMightContainItem = (TreeViewItem)parentContainer.ItemContainerGenerator.ContainerFromItem(item);
if (containerThatMightContainItem != null)
return containerThatMightContainItem;
TreeViewItem recursionResult = ContainerFromItem(parentContainer.ItemContainerGenerator, parentContainer.Items, item);
if (recursionResult != null)
return recursionResult;
}
return null;
}
private static object ItemFromContainer(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, TreeViewItem container)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem parentContainer = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
TreeViewItem itemThatMightBelongToContainer = (TreeViewItem)parentContainer.ItemContainerGenerator.ItemFromContainer(container);
if (itemThatMightBelongToContainer != null)
return itemThatMightBelongToContainer;
TreeViewItem recursionResult = ItemFromContainer(parentContainer.ItemContainerGenerator, parentContainer.Items, container) as TreeViewItem;
if (recursionResult != null)
return recursionResult;
}
return null;
}
static void ContainerStatusChanged(DataGrid dataGrid, ItemContainerGenerator generator)
{
if (generator != null && generator.Status == GeneratorStatus.ContainersGenerated && dataGrid.SelectedItems.Count == 1)
{
var row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromItem(dataGrid.SelectedItems[0]);
if (row != null)
{
var cell = DataGridHelper.GetCell(dataGrid, row.GetIndex(), 1);
if (cell != null)
{
SelectCellMethod.Invoke(dataGrid, new object[] { cell, false, false, false });
}
}
}
}
private static bool Deselect(ItemContainerGenerator itemContainerGenerator)
{
if (itemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) return false;
foreach (object item in itemContainerGenerator.Items)
{
TreeViewItem treeViewItem = (TreeViewItem)itemContainerGenerator.ContainerFromItem(item);
if (treeViewItem.IsSelected)
{
treeViewItem.IsSelected = false;
return true;
}
bool retVal = Deselect(treeViewItem.ItemContainerGenerator);
if (retVal)
return true;
}
return false;
}
private static object ExpandPathToNodeAndSelectBestMatchRecursively(UIElement treeView, ItemContainerGenerator owningItemGenerator, object currentNodeDataItem, Func<object, IEnumerable> childNodeDataItemSelector, Func<object, string, int, bool> matchPathToNode, string[] pathTokens, int tokenIndex)
{
var foundNode = default(object);
var currentToken = pathTokens[tokenIndex];
// Check whether this is the node we are looking for.
if ((matchPathToNode(currentNodeDataItem, currentToken, tokenIndex)))
{
// Expand this item before looking at the children. The update layout call is needed because although the
// item has been expanded, none of the expanded items will have been created, and so calls to the
// treeViewItem.ItemGenerator will return null until the UI has had a chance to create the child items.
var currentTreeViewItem = ExpandTreeViewItem(owningItemGenerator, currentNodeDataItem);
if (treeView != null)
{
treeView.UpdateLayout();
}
if (tokenIndex < pathTokens.Length - 1)
{
// Now see if we can continue to match any of the children.
var currentChildItemCenerator = currentTreeViewItem == null ? null : currentTreeViewItem.ItemContainerGenerator;
var childNodes = childNodeDataItemSelector(currentNodeDataItem);
if (childNodes != null)
{
foreach (var childNode in childNodes)
{
foundNode = ExpandPathToNodeAndSelectBestMatchRecursively(treeView, currentChildItemCenerator, childNode, childNodeDataItemSelector, matchPathToNode, pathTokens, tokenIndex + 1);
if (foundNode != null)
{
break;
}
}
}
}
// This node is a match, but none of the children are (or there are no children). Select this node instead.
if (foundNode == null)
{
foundNode = currentNodeDataItem;
SelectTreeViewItem(owningItemGenerator, currentNodeDataItem);
}
}
return foundNode;
}
public void ItemContainerGeneratorBasicTest()
{
TestGeneratorHost host = new TestGeneratorHost();
ItemContainerGenerator generator = new ItemContainerGenerator(host);
ItemsChangedEventArgs lastChangedArg = null;
generator.ItemsChanged += (sender, e) => lastChangedArg = e;
host.View.Add("item1");
Assert.AreEqual(NotifyCollectionChangedAction.Add, lastChangedArg.Action);
Assert.AreEqual(0, lastChangedArg.NewStartingIndex);
Assert.AreEqual(1, lastChangedArg.ItemsCount);
Assert.AreEqual(0, lastChangedArg.ContainersCount);
FrameworkElement container1 = generator.Generate(0);
Assert.IsTrue(host.Containers.ContainsKey("item1"));
Assert.AreEqual("item1", container1.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
host.View[0] = "item2";
Assert.IsFalse(host.Containers.ContainsKey("item1"));
Assert.IsTrue(host.Containers.ContainsKey("item2"));
Assert.IsNull(container1.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
FrameworkElement container2 = generator.Generate(0);
Assert.IsTrue(host.Containers.ContainsKey("item2"));
Assert.AreEqual("item2", container2.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
host.View.Remove("item2");
Assert.IsFalse(host.Containers.ContainsKey("item2"));
Assert.IsNull(container2.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
host.View.Add("item3");
Assert.IsFalse(host.Containers.ContainsKey("item3"));
FrameworkElement container3 = generator.Generate(0);
Assert.IsTrue(host.Containers.ContainsKey("item3"));
Assert.AreEqual("item3", container3.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
generator.Dispose();
Assert.IsFalse(host.Containers.ContainsKey("item3"));
Assert.IsNull(container3.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
}
private void ExpandNextItemInQueueAndSelectIfLastItem(ItemCollection items, ItemContainerGenerator itemContainerGenerator)
{
var sampleName = _queueOfIndividualnodesToExpandAndSelectTheLast.Dequeue();
var sample = items.FirstOrDefault(s => (
((s is Sample) && ((Sample)s).Name == sampleName)
|| ((s is Group) && ((Group)s).Name == sampleName))
);
if (sample == null)
return;
var container = (TreeViewItem)itemContainerGenerator.ContainerFromItem(sample);
if (_queueOfIndividualnodesToExpandAndSelectTheLast.Count == 0)
{
container.IsSelected = true;
}
else
{
ExpandNextItemInQueueAndSelectIfLastItem(container.Items, container.ItemContainerGenerator);
}
}
//-------------------------------------------------------------------
//
// Private Methods
//
//-------------------------------------------------------------------
#region Private Methods
// apply styles described in View.
private void ApplyNewView()
{
ViewBase newView = View;
if (newView != null)
{
// update default style key of ListView
DefaultStyleKey = newView.DefaultStyleKey;
}
else
{
ClearValue(DefaultStyleKeyProperty);
}
// Encounter a new view after loaded means user is switching view.
// Force to regenerate all containers.
if (IsLoaded)
{
ItemContainerGenerator.Refresh();
}
}
private void ConnectToGenerator()
{
Debug.Assert(_itemContainerGenerator == null, "Attempted to connect to a generator when Panel._itemContainerGenerator is non-null.");
ItemsControl itemsOwner = ItemsControl.GetItemsOwner(this);
if (itemsOwner == null)
{
// This can happen if IsItemsHost=true, but the panel is not nested in an ItemsControl
throw new InvalidOperationException(SR.Get(SRID.Panel_ItemsControlNotFound));
}
IItemContainerGenerator itemsOwnerGenerator = itemsOwner.ItemContainerGenerator;
if (itemsOwnerGenerator != null)
{
_itemContainerGenerator = itemsOwnerGenerator.GetItemContainerGeneratorForPanel(this);
if (_itemContainerGenerator != null)
{
_itemContainerGenerator.ItemsChanged += new ItemsChangedEventHandler(OnItemsChanged);
((IItemContainerGenerator)_itemContainerGenerator).RemoveAll();
}
}
}
private static TreeViewItem ContainerFromItem(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, object item)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem parentContainer = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (parentContainer == null)
{
return(null);
}
TreeViewItem containerThatMightContainItem = (TreeViewItem)parentContainer.ItemContainerGenerator.ContainerFromItem(item);
if (containerThatMightContainItem != null)
{
return(containerThatMightContainItem);
}
TreeViewItem recursionResult = ContainerFromItem(parentContainer.ItemContainerGenerator, parentContainer.Items, item);
if (recursionResult != null)
{
return(recursionResult);
}
}
return(null);
}
private static object ItemFromContainer(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, TreeViewItem container)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem parentContainer = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (parentContainer == null)
{
return(null);
}
TreeViewItem itemThatMightBelongToContainer = (TreeViewItem)parentContainer.ItemContainerGenerator.ItemFromContainer(container);
if (itemThatMightBelongToContainer != null)
{
return(itemThatMightBelongToContainer);
}
TreeViewItem recursionResult = ItemFromContainer(parentContainer.ItemContainerGenerator, parentContainer.Items, container) as TreeViewItem;
if (recursionResult != null)
{
return(recursionResult);
}
}
return(null);
}
private static TreeViewItem FindContainer(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, Predicate <TreeViewItem> condition)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem containerThatMightMeetTheCondition = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (containerThatMightMeetTheCondition == null)
{
return(null);
}
if (condition(containerThatMightMeetTheCondition))
{
return(containerThatMightMeetTheCondition);
}
TreeViewItem recursionResult = FindContainer(containerThatMightMeetTheCondition.ItemContainerGenerator, containerThatMightMeetTheCondition.Items, condition);
if (recursionResult != null)
{
return(recursionResult);
}
}
return(null);
}
/// <summary>Finds the TreeViewItem from the collection.</summary>
/// <param name="parentItemContainerGenerator">The parent item container.</param>
/// <param name="itemCollection">The item collection.</param>
/// <param name="predicate">The TreeViewItem.</param>
/// <returns>The TreeViewItem found.</returns>
static TreeViewItem FindTreeViewItem(
ItemContainerGenerator parentItemContainerGenerator,
ItemCollection itemCollection,
Predicate<TreeViewItem> predicate)
{
foreach (var trvItem in
from object item in itemCollection
select item as TreeViewItem ?? (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(item))
{
if (predicate(trvItem))
{
return trvItem;
}
TreeViewItem nestedSearchResult = FindTreeViewItem(
trvItem.ItemContainerGenerator, trvItem.Items, predicate);
if (nestedSearchResult != null)
{
return nestedSearchResult;
}
}
return null;
}
void InvokeItemsChanged(object o, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
SetLogicalParent(native, e.NewItems);
break;
case NotifyCollectionChangedAction.Remove:
SetLogicalParent(IntPtr.Zero, e.OldItems);
break;
case NotifyCollectionChangedAction.Replace:
SetLogicalParent(IntPtr.Zero, e.OldItems);
SetLogicalParent(native, e.NewItems);
break;
}
ItemContainerGenerator.OnOwnerItemsItemsChanged(o, e);
if (!itemsIsDataBound)
{
OnItemsChanged(e);
}
}
private int ElementIndex(ListBoxItem listItem)
{
return(ItemContainerGenerator.IndexFromContainer(listItem));
}
/// <summary>
/// Treeview doesn't have a simple clear selection
/// </summary>
/// <remarks>
/// Got this here:
/// http://stackoverflow.com/questions/676819/wpf-treeview-clear-selection
/// </remarks>
private static void ClearTreeViewSelection(ItemCollection items, ItemContainerGenerator containerGenerator)
{
if (items != null && containerGenerator != null)
{
for (int cntr = 0; cntr < items.Count; cntr++)
{
// Can't use item directly, because it could be any UIElement
TreeViewItem itemContainer = containerGenerator.ContainerFromIndex(cntr) as TreeViewItem;
if (itemContainer != null)
{
// Recurse
ClearTreeViewSelection(itemContainer.Items, itemContainer.ItemContainerGenerator);
itemContainer.IsSelected = false;
}
}
}
}
private static TreeViewItem FindContainer(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, Predicate<TreeViewItem> condition)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem containerThatMightMeetTheCondition = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (containerThatMightMeetTheCondition == null)
return null;
if (condition(containerThatMightMeetTheCondition))
return containerThatMightMeetTheCondition;
TreeViewItem recursionResult = FindContainer(containerThatMightMeetTheCondition.ItemContainerGenerator, containerThatMightMeetTheCondition.Items, condition);
if (recursionResult != null)
return recursionResult;
}
return null;
}
private static IEnumerable<TreeViewItem> GetTreeViewItems(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem container = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (container != null)
yield return container;
foreach (var treeViewItem in GetTreeViewItems(container.ItemContainerGenerator, container.Items))
yield return treeViewItem;
}
}
// update container and index with current values
internal ItemInfo Refresh(ItemContainerGenerator generator)
{
if (Container == null && Index < 0)
{
Container = generator.ContainerFromItem(Item);
}
if (Index < 0 && Container != null)
{
Index = generator.IndexFromContainer(Container);
}
if (Container == null && Index >= 0)
{
Container = generator.ContainerFromIndex(Index);
}
if (Container == SentinelContainer && Index >= 0)
{
Container = null; // caller explicitly wants null container
}
return this;
}
private static TreeViewItem ContainerFromItem(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, object item)
{
//todo:needed?
//if (parentItemContainerGenerator.Status == System.Windows.Controls.Primitives.GeneratorStatus.NotStarted)
//{
// IItemContainerGenerator generator = parentItemContainerGenerator;
// GeneratorPosition position = generator.GeneratorPositionFromIndex(0);
// using (generator.StartAt(position, GeneratorDirection.Forward, true))
// {
// foreach (object o in itemCollection)
// {
// DependencyObject dp = generator.GenerateNext();
// generator.PrepareItemContainer(dp);
// }
// }
//}
foreach (object curChildItem in itemCollection)
{
TreeViewItem parentContainer = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (parentContainer != null)
{
TreeViewItem containerThatMightContainItem = (TreeViewItem)parentContainer.ItemContainerGenerator.ContainerFromItem(item);
if (containerThatMightContainItem != null)
return containerThatMightContainItem;
TreeViewItem recursionResult = ContainerFromItem(parentContainer.ItemContainerGenerator, parentContainer.Items, item);
if (recursionResult != null)
return recursionResult;
}
}
return null;
}
void UseGenerator(ItemContainerGenerator generator)
{
if (generator == _generator)
return;
if (_generator != null)
_generator.PanelChanged -= new EventHandler(OnPanelChanged);
_generator = generator;
if (_generator != null)
_generator.PanelChanged += new EventHandler(OnPanelChanged);
}
public BatchGenerator(ItemContainerGenerator factory)
{
_factory = factory;
_factory._isGeneratingBatches = true;
_factory.SetStatus(GeneratorStatus.GeneratingContainers);
}
private void CreateItemCollectionAndGenerator()
{
_items = new ItemCollection(this);
// ItemInfos must get adjusted before the generator's change handler is called,
// so that any new ItemInfos arising from the generator don't get adjusted by mistake
// (see Win8 690623).
((INotifyCollectionChanged)_items).CollectionChanged += new NotifyCollectionChangedEventHandler(OnItemCollectionChanged1);
// the generator must attach its collection change handler before
// the control itself, so that the generator is up-to-date by the
// time the control tries to use it (bug 892806 et al.)
_itemContainerGenerator = new ItemContainerGenerator(this);
_itemContainerGenerator.ChangeAlternationCount();
((INotifyCollectionChanged)_items).CollectionChanged += new NotifyCollectionChangedEventHandler(OnItemCollectionChanged2);
if (IsInitPending)
{
_items.BeginInit();
}
else if (IsInitialized)
{
_items.BeginInit();
_items.EndInit();
}
((INotifyCollectionChanged)_groupStyle).CollectionChanged += new NotifyCollectionChangedEventHandler(OnGroupStyleChanged);
}
private ItemContainerGenerator(ItemContainerGenerator parent, GroupItem groupItem)
: this(parent, parent.Host, groupItem, parent.Level + 1)
{
}
// Token: 0x06004E0E RID: 19982 RVA: 0x0015FCB8 File Offset: 0x0015DEB8
internal void PrepareItemContainer(object item, ItemsControl parentItemsControl)
{
if (this.Generator == null)
{
return;
}
if (this._itemsHost != null)
{
this._itemsHost.IsItemsHost = true;
}
bool flag = parentItemsControl != null && VirtualizingPanel.GetIsVirtualizingWhenGrouping(parentItemsControl);
if (this.Generator != null)
{
if (!flag)
{
this.Generator.Release();
}
else
{
this.Generator.RemoveAllInternal(true);
}
}
ItemContainerGenerator parent = this.Generator.Parent;
GroupStyle groupStyle = parent.GroupStyle;
Style style = groupStyle.ContainerStyle;
if (style == null && groupStyle.ContainerStyleSelector != null)
{
style = groupStyle.ContainerStyleSelector.SelectStyle(item, this);
}
if (style != null)
{
if (!style.TargetType.IsInstanceOfType(this))
{
throw new InvalidOperationException(SR.Get("StyleForWrongType", new object[]
{
style.TargetType.Name,
base.GetType().Name
}));
}
base.Style = style;
base.WriteInternalFlag2(InternalFlags2.IsStyleSetFromGenerator, true);
}
if (base.ContentIsItem || !base.HasNonDefaultValue(ContentControl.ContentProperty))
{
base.Content = item;
base.ContentIsItem = true;
}
if (!base.HasNonDefaultValue(ContentControl.ContentTemplateProperty))
{
base.ContentTemplate = groupStyle.HeaderTemplate;
}
if (!base.HasNonDefaultValue(ContentControl.ContentTemplateSelectorProperty))
{
base.ContentTemplateSelector = groupStyle.HeaderTemplateSelector;
}
if (!base.HasNonDefaultValue(ContentControl.ContentStringFormatProperty))
{
base.ContentStringFormat = groupStyle.HeaderStringFormat;
}
Helper.ClearVirtualizingElement(this);
if (flag)
{
Helper.SetItemValuesOnContainer(parentItemsControl, this, item);
if (this._expander != null)
{
Helper.SetItemValuesOnContainer(parentItemsControl, this._expander, item);
}
}
}
private TreeViewItem GetTreeViewItem(ItemContainerGenerator containerGenerator, IDataSourceViewModel item)
{
var container = (TreeViewItem) containerGenerator.ContainerFromItem(item);
if (container != null)
return container;
foreach (object childItem in containerGenerator.Items)
{
var parent = containerGenerator.ContainerFromItem(childItem) as TreeViewItem;
if (parent == null)
continue;
container = parent.ItemContainerGenerator.ContainerFromItem(item) as TreeViewItem;
if (container != null)
return container;
container = GetTreeViewItem(parent.ItemContainerGenerator, item);
if (container != null)
return container;
}
return null;
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
internal void PrepareItemContainer(object item, ItemsControl parentItemsControl)
{
if (Generator == null)
{
return; // user-declared GroupItem - ignore (
}
// If a GroupItem is being recycled set back IsItemsHost
if (_itemsHost != null)
{
_itemsHost.IsItemsHost = true;
}
bool isVirtualizingWhenGrouping = (parentItemsControl != null && VirtualizingPanel.GetIsVirtualizingWhenGrouping(parentItemsControl));
// Release any previous containers. Also ensures Items and GroupStyle are hooked up correctly
if (Generator != null)
{
if (!isVirtualizingWhenGrouping)
{
Generator.Release();
}
else
{
Generator.RemoveAllInternal(true /*saveRecycleQueue*/);
}
}
ItemContainerGenerator generator = Generator.Parent;
GroupStyle groupStyle = generator.GroupStyle;
// apply the container style
Style style = groupStyle.ContainerStyle;
// no ContainerStyle set, try ContainerStyleSelector
if (style == null)
{
if (groupStyle.ContainerStyleSelector != null)
{
style = groupStyle.ContainerStyleSelector.SelectStyle(item, this);
}
}
// apply the style, if found
if (style != null)
{
// verify style is appropriate before applying it
if (!style.TargetType.IsInstanceOfType(this))
{
throw new InvalidOperationException(SR.Get(SRID.StyleForWrongType, style.TargetType.Name, this.GetType().Name));
}
this.Style = style;
this.WriteInternalFlag2(InternalFlags2.IsStyleSetFromGenerator, true);
}
// forward the header template information
if (ContentIsItem || !HasNonDefaultValue(ContentProperty))
{
this.Content = item;
ContentIsItem = true;
}
if (!HasNonDefaultValue(ContentTemplateProperty))
{
this.ContentTemplate = groupStyle.HeaderTemplate;
}
if (!HasNonDefaultValue(ContentTemplateSelectorProperty))
{
this.ContentTemplateSelector = groupStyle.HeaderTemplateSelector;
}
if (!HasNonDefaultValue(ContentStringFormatProperty))
{
this.ContentStringFormat = groupStyle.HeaderStringFormat;
}
//
// Clear previously cached items sizes
//
Helper.ClearVirtualizingElement(this);
//
// ItemValueStorage: restore saved values for this item onto the new container
//
if (isVirtualizingWhenGrouping)
{
Helper.SetItemValuesOnContainer(parentItemsControl, this, item);
if (_expander != null)
{
Helper.SetItemValuesOnContainer(parentItemsControl, _expander, item);
}
}
}
private ListBoxItem ElementAt(int index)
{
return(ItemContainerGenerator.ContainerFromIndex(index) as ListBoxItem);
}
void IsDropDownOpenChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
bool open = (bool)e.NewValue;
if (_popup != null)
{
_popup.IsOpen = open;
}
if (_dropDownToggle != null)
{
_dropDownToggle.IsChecked = open;
}
if (open)
{
ComboBoxItem t = null;
FocusedIndex = Items.Count > 0 ? Math.Max(SelectedIndex, 0) : -1;
if (FocusedIndex > -1)
{
t = ItemContainerGenerator.ContainerFromIndex(FocusedIndex) as ComboBoxItem;
}
// If the ItemsPresenter hasn't attached yet 't' will be null.
// When the itemsPresenter attaches, focus will be set when the
// item is loaded
if (t != null)
{
t.Focus();
}
LayoutUpdated += UpdatePopupSizeAndPosition;
OnDropDownOpened(EventArgs.Empty);
// Raises UIA Event
AutomationPeer peer = ((ComboBox)sender).AutomationPeer;
if (peer != null)
{
peer.RaisePropertyChangedEvent(ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty,
ExpandCollapseState.Collapsed,
ExpandCollapseState.Expanded);
}
}
else
{
Focus();
LayoutUpdated -= UpdatePopupSizeAndPosition;
OnDropDownClosed(EventArgs.Empty);
// Raises UIA Event
AutomationPeer peer = ((ComboBox)sender).AutomationPeer;
if (peer != null)
{
peer.RaisePropertyChangedEvent(ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty,
ExpandCollapseState.Expanded,
ExpandCollapseState.Collapsed);
}
}
UpdateDisplayedItem(open && SelectedItem is UIElement ? null : SelectedItem);
UpdateVisualState(true);
}
/// <summary>
/// Gets the generated (UI) EnhancedTreeViewItem.
/// </summary>
/// <param name="containerGenerator">The ItemContainerGenerator from the "parent".</param>
/// <param name="item">The (bound) item to get the generated UI Item.</param>
/// <returns>The generated UI EnhancedTreeViewItem. null if nothing to return.</returns>
private static EnhancedTreeViewItem ContainerFromItem(ItemContainerGenerator containerGenerator, object item)
{
if (containerGenerator != null)
{
var container = containerGenerator.ContainerFromItem(item) as EnhancedTreeViewItem;
if (container != null)
{
return container;
}
// Get items from Container through Reflection. This Property is only public in verision > .NET 4.5
IEnumerable items = containerGenerator.GetPropertyValue("Items") as IEnumerable;
if (items != null)
{
foreach (var childItem in items)
{
var parent = containerGenerator.ContainerFromItem(childItem) as EnhancedTreeViewItem;
if (parent == null)
{
continue;
}
container = parent.ItemContainerGenerator.ContainerFromItem(item) as EnhancedTreeViewItem;
if (container != null)
{
return container;
}
container = ContainerFromItem(parent.ItemContainerGenerator, item);
if (container != null)
{
return container;
}
}
}
}
return null;
}
/// <summary>
/// Method which generates the focus trail cell
/// if it is not already generated and adds it to
/// the block lists appropriately.
/// </summary>
private bool GenerateChildForFocusTrail(
ItemContainerGenerator generator,
List<int> realizedColumnIndices,
List<int> realizedColumnDisplayIndices,
Size constraint,
int displayIndex,
ref int displayIndexListIterator)
{
DataGrid dataGrid = ParentDataGrid;
DataGridColumn column = dataGrid.ColumnFromDisplayIndex(displayIndex);
if (column.IsVisible)
{
int columnIndex = dataGrid.ColumnIndexFromDisplayIndex(displayIndex);
UIElement child = generator.ContainerFromIndex(columnIndex) as UIElement;
if (child == null)
{
int childIndex = columnIndex;
Size childSize;
using (((IItemContainerGenerator)generator).StartAt(IndexToGeneratorPositionForStart(generator, childIndex, out childIndex), GeneratorDirection.Forward, true))
{
child = GenerateChild(generator, constraint, column, ref childIndex, out childSize);
}
}
if (child != null && DataGridHelper.TreeHasFocusAndTabStop(child))
{
AddToIndicesListIfNeeded(
realizedColumnIndices,
realizedColumnDisplayIndices,
columnIndex,
displayIndex,
ref displayIndexListIterator);
return true;
}
}
return false;
}
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
if (!e.Handled)
{
var key = e.Key;
if (FlowDirection == FlowDirection.RightToLeft)
{
if (key == Key.Left)
{
key = Key.Right;
}
else if (key == Key.Right)
{
key = Key.Left;
}
}
e.Handled = true;
switch (key)
{
case Key.Escape:
IsDropDownOpen = false;
break;
case Key.Enter:
case Key.Space:
if (IsDropDownOpen && FocusedIndex != SelectedIndex)
{
SelectedIndex = FocusedIndex;
IsDropDownOpen = false;
}
else
{
IsDropDownOpen = true;
}
break;
case Key.Right:
case Key.Down:
if (IsDropDownOpen)
{
if (FocusedIndex < Items.Count - 1)
{
FocusedIndex++;
((Control)ItemContainerGenerator.ContainerFromIndex(FocusedIndex)).Focus();
}
}
else
{
SelectedIndex = Math.Min(SelectedIndex + 1, Items.Count - 1);
}
break;
case Key.Left:
case Key.Up:
if (IsDropDownOpen)
{
if (FocusedIndex > 0)
{
FocusedIndex--;
((Control)ItemContainerGenerator.ContainerFromIndex(FocusedIndex)).Focus();
}
}
else if (SelectedIndex != -1)
{
SelectedIndex = Math.Max(SelectedIndex - 1, 0);
}
break;
default:
e.Handled = false;
break;
}
}
else
{
Console.WriteLine("Already handled");
}
}
/// <summary>
/// Creates a new instance used to queue action for completion or items changes of <see cref="ItemContainerGenerator"/>
/// </summary>
/// <param name="generator">The <see cref="ItemContainerGenerator"/> to be used.</param>
/// <param name="action">The <see cref="System.Action"/> that should be invoked.</param>
public ItemContainerGeneratorAction(ItemContainerGenerator generator, Action action)
{
this.Generator = generator;
this.Action = action;
}
void UpdateDisplayedItem(object selectedItem)
{
object content;
// Can't do anything with no content presenter
if (_contentPresenter == null)
{
return;
}
// Return the currently displayed object (which is a UIElement)
// to its original container.
if (DisplayedItem != null)
{
content = _contentPresenter.Content;
DisplayedItem.Content = content;
DisplayedItem = null;
}
_contentPresenter.Content = null;
if (selectedItem == null)
{
_contentPresenter.Content = NothingSelectedFallback;
_contentPresenter.ContentTemplate = null;
SelectionBoxItem = null;
SelectionBoxItemTemplate = null;
return;
}
// If the currently selected item is a ComboBoxItem (not ListBoxItem!), we
// display its Content instead of the CBI itself.
content = selectedItem;
if (content is ComboBoxItem)
{
content = ((ComboBoxItem)content).Content;
}
// Only allow DisplayedItem to be non-null if we physically move
// its content. This will only happen if DisplayedItem == SelectedItem
DisplayedItem = ItemContainerGenerator.ContainerFromIndex(SelectedIndex) as ComboBoxItem;
SelectionBoxItem = content;
SelectionBoxItemTemplate = ItemTemplate;
// If displayed item is avaiable, we can get the right template from there. Otherwise
// we need to create a container, read the template and destroy it.
if (DisplayedItem != null)
{
SelectionBoxItemTemplate = DisplayedItem.ContentTemplate;
if (content is UIElement)
{
DisplayedItem.Content = null;
}
else
{
DisplayedItem = null;
}
}
else
{
bool fresh;
ComboBoxItem container = ItemContainerGenerator.ContainerFromIndex(SelectedIndex) as ComboBoxItem;
if (container == null)
{
var index = ItemContainerGenerator.GeneratorPositionFromIndex(SelectedIndex);
using (ItemContainerGenerator.StartAt(index, GeneratorDirection.Forward, true))
container = ItemContainerGenerator.GenerateNext(out fresh) as ComboBoxItem;
ItemContainerGenerator.PrepareItemContainer(container);
}
SelectionBoxItemTemplate = container.ContentTemplate;
}
_contentPresenter.Content = SelectionBoxItem;
_contentPresenter.ContentTemplate = SelectionBoxItemTemplate;
}
//------------------------------------------------------
//
// 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>
/// Initializes a new instance of the TreeView class.
/// </summary>
public TreeView()
{
DefaultStyleKey = typeof(TreeView);
ItemContainerGenerator = new ItemContainerGenerator(this);
}
public void SetGenerator(ItemContainerGenerator generator)
{
this.Generator = generator;
generator.ItemsChanged += new ItemsChangedEventHandler(OnItemsChanged);
}
private static TreeViewItem FindTreeViewItem(ItemContainerGenerator itemContainerGenerator, object dataContext)
{
if (itemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) return null;
if (itemContainerGenerator.Items.Contains(dataContext))
return (TreeViewItem)itemContainerGenerator.ContainerFromItem(dataContext);
foreach (object item in itemContainerGenerator.Items)
{
TreeViewItem treeViewItem = (TreeViewItem)itemContainerGenerator.ContainerFromItem(item);
TreeViewItem retVal = FindTreeViewItem(treeViewItem.ItemContainerGenerator, dataContext);
if (retVal != null)
return retVal;
}
return null;
}
/// <summary>
/// Called by ListBoxItem instances when they get focus
/// </summary>
/// <param name="listBoxItemNewFocus">ListBoxItem that got focus</param>
internal override void NotifyListItemGotFocus(ListBoxItem listBoxItemNewFocus)
{
// Track the focused index
_focusedIndex = ItemContainerGenerator.IndexFromContainer(listBoxItemNewFocus);
}
protected override void OnKeyDown(KeyEventArgs e)
{
if (!e.Handled)
{
bool handled = false;
int newFocusedIndex = -1;
switch (e.Key)
{
case Key.Space:
case Key.Enter:
if ((Key.Enter != e.Key) || KeyboardNavigation.GetAcceptsReturn(this))
{
if (ModifierKeys.Alt != (Keyboard.Modifiers & (ModifierKeys.Control | ModifierKeys.Alt)))
{
// KeyEventArgs.OriginalSource (used by WPF) isn't available in Silverlight; use FocusManager.GetFocusedElement instead
ListBoxItem listBoxItem = FocusManager.GetFocusedElement() as ListBoxItem;
if (null != listBoxItem)
{
if ((ModifierKeys.Control == (Keyboard.Modifiers & ModifierKeys.Control)) && listBoxItem.IsSelected)
{
SelectedItem = null;
}
else
{
SelectedItem = ItemContainerGenerator.ItemFromContainer(listBoxItem);
}
handled = true;
}
}
}
break;
case Key.Home:
newFocusedIndex = 0;
break;
case Key.End:
newFocusedIndex = Items.Count - 1;
break;
case Key.PageUp:
newFocusedIndex = NavigateByPage(false);
break;
case Key.PageDown:
newFocusedIndex = NavigateByPage(true);
break;
case Key.Left:
if (IsVerticalOrientation())
{
ElementScrollViewerScrollInDirection(Key.Left);
}
else
{
newFocusedIndex = _focusedIndex - 1;
}
break;
case Key.Up:
if (IsVerticalOrientation())
{
newFocusedIndex = _focusedIndex - 1;
}
else
{
ElementScrollViewerScrollInDirection(Key.Up);
}
break;
case Key.Right:
if (IsVerticalOrientation())
{
ElementScrollViewerScrollInDirection(Key.Right);
}
else
{
newFocusedIndex = _focusedIndex + 1;
}
break;
case Key.Down:
if (IsVerticalOrientation())
{
newFocusedIndex = _focusedIndex + 1;
}
else
{
ElementScrollViewerScrollInDirection(Key.Down);
}
break;
// case Key.Divide: // Feature only used by SelectionMode.Extended
// case Key.Oem2: // Key not supported by Silverlight
// break;
// case Key.Oem5: // Key not supported by Silverlight
// break;
default:
Debug.Assert(!handled);
break;
}
if ((-1 != newFocusedIndex) &&
(-1 != _focusedIndex) &&
(newFocusedIndex != _focusedIndex) &&
(0 <= newFocusedIndex) &&
(newFocusedIndex < Items.Count))
{
// A key press will change the focused ListBoxItem
ListBoxItem listBoxItem = (ListBoxItem)ItemContainerGenerator.ContainerFromIndex(newFocusedIndex);
Debug.Assert(null != listBoxItem);
ScrollIntoView(ItemContainerGenerator.ItemFromContainer(listBoxItem));
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
listBoxItem.Focus();
}
else
{
SelectedItem = ItemContainerGenerator.ItemFromContainer(listBoxItem);
}
handled = true;
}
if (handled)
{
e.Handled = true;
}
}
}
