//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
/// <summary>
/// Structural Cache contructor.
/// </summary>
/// <param name="owner">Owner of the conent</param>
/// <param name="textContainer">TextContainer representing content</param>
internal StructuralCache(FlowDocument owner, TextContainer textContainer)
{
Invariant.Assert(owner != null);
Invariant.Assert(textContainer != null);
Invariant.Assert(textContainer.Parent != null);
_owner = owner;
_textContainer = textContainer;
_backgroundFormatInfo = new BackgroundFormatInfo(this);
}
// Adds a TextTreeInsertElementUndoUnit to the open parent undo unit, if any.
// Called from TextContainer.InsertElement.
internal static void CreateInsertElementUndoUnit(TextContainer tree, int symbolOffset, bool deep)
{
UndoManager undoManager;
undoManager = GetOrClearUndoManager(tree);
if (undoManager == null)
return;
undoManager.Add(new TextTreeInsertElementUndoUnit(tree, symbolOffset, deep));
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// Dumps a TextContainer.
internal static void Dump(TextContainer tree)
{
if (tree.RootNode == null)
{
Debug.WriteLine("<" + tree + "/>");
}
else
{
DumpNodeRecursive(tree.RootNode, 0);
}
}
// Dumps a TextContainer, xaml style.
internal static void DumpFlat(TextContainer tree)
{
if (tree.RootNode == null)
{
Debug.WriteLine("<" + tree + "/>");
}
else
{
DumpFlat(tree.RootNode);
}
}
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Creates a TextTreeRootNode instance.
internal TextTreeRootNode(TextContainer tree)
{
_tree = tree;
#if REFCOUNT_DEAD_TEXTPOINTERS
_deadPositionList = new ArrayList(0);
#endif // REFCOUNT_DEAD_TEXTPOINTERS
// Root node has two imaginary element edges to match TextElementNode semantics.
_symbolCount = 2;
// CaretUnitBoundaryCache always starts unset.
_caretUnitBoundaryCacheOffset = -1;
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// Creates a new undo unit instance.
internal TextTreeExtractElementUndoUnit(TextContainer tree, TextTreeTextElementNode elementNode)
: base(tree, elementNode.GetSymbolOffset(tree.Generation))
{
_symbolCount = elementNode.SymbolCount;
_type = elementNode.TextElement.GetType();
_localValues = GetPropertyRecordArray(elementNode.TextElement);
_resources = elementNode.TextElement.Resources;
// Table requires additional work for storing its Columns collection
if (elementNode.TextElement is Table)
{
_columns = TextTreeDeleteContentUndoUnit.SaveColumns((Table)elementNode.TextElement);
}
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// Creates a new instance.
// start/end span the content to copy into the new undo unit -- they
// should always share the same scoping TextElement.
internal TextTreeDeleteContentUndoUnit(TextContainer tree, TextPointer start, TextPointer end) : base(tree, start.GetSymbolOffset())
{
TextTreeNode node;
TextTreeNode haltNode;
start.DebugAssertGeneration();
end.DebugAssertGeneration();
Invariant.Assert(start.GetScopingNode() == end.GetScopingNode(), "start/end have different scope!");
node = start.GetAdjacentNode(LogicalDirection.Forward);
haltNode = end.GetAdjacentNode(LogicalDirection.Forward);
// Walk the content, copying runs as we go.
_content = CopyContent(node, haltNode);
}
// Adds a DeleteContentUndoUnit to the open parent undo unit, if any.
// Called by TextContainer.DeleteContent.
internal static TextTreeDeleteContentUndoUnit CreateDeleteContentUndoUnit(TextContainer tree, TextPointer start, TextPointer end)
{
UndoManager undoManager;
TextTreeDeleteContentUndoUnit undoUnit;
if (start.CompareTo(end) == 0)
return null;
undoManager = GetOrClearUndoManager(tree);
if (undoManager == null)
return null;
undoUnit = new TextTreeDeleteContentUndoUnit(tree, start, end);
undoManager.Add(undoUnit);
return undoUnit;
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
// Attaches this control to a new TextContainer.
internal void InitializeTextContainer(TextContainer textContainer)
{
Invariant.Assert(textContainer != null);
Invariant.Assert(textContainer.TextSelection == null);
// Uninitialize previous TextEditor
if (_textContainer != null)
{
Invariant.Assert(_textEditor != null);
Invariant.Assert(_textEditor.TextContainer == _textContainer);
Invariant.Assert(_textEditor.TextContainer.TextSelection == _textEditor.Selection);
// Detach existing editor from VisualTree
DetachFromVisualTree();
// Discard TextEditor - must release text container
_textEditor.OnDetach();
}
// Save text container
_textContainer = textContainer;
_textContainer.Changed += new TextContainerChangedEventHandler(OnTextContainerChanged);
// Create a text editor, initialize undo manager for it, and link it to text container
_textEditor = new TextEditor(_textContainer, this, true);
_textEditor.Selection.Changed += new EventHandler(OnSelectionChangedInternal);
// Init a default undo limit.
UndoManager undoManager = UndoManager.GetUndoManager(this);
if (undoManager != null)
{
undoManager.UndoLimit = this.UndoLimit;
}
// Delay raising automation events until the automation subsystem is activated by a client.
// ISSUE-2005/01/23-vsmirnov - Adding an event listener to AutomationProvider apparently
// causes memory leaks because TextBoxBase is never released. I comment it out for now just
// to fix the build break (perf DRT failure). Need to find a right fix later.
// AutomationProvider.Activated += new AutomationActivatedEventHandler(OnAutomationActivated);
}
/// <summary>
/// Constructor
/// </summary>
public TextBox() : base()
{
// Register static editing command handlers.
// This only has an effect that first time we make the call.
// We don't use the static ctor because there are cases
// where another control will want to alias our properties
// but doesn't need this overhead.
TextEditor.RegisterCommandHandlers(typeof(TextBox), /*acceptsRichContent:*/false, /*readOnly*/false, /*registerEventListeners*/false);
// Create TextContainer and TextEditor associated with it
TextContainer container = new TextContainer(this, true /* plainTextOnly */);
container.CollectTextChanges = true;
InitializeTextContainer(container);
// TextBox only accepts plain text, so change TextEditor's default to that.
this.TextEditor.AcceptsRichContent = false;
}
// Positions this navigator at a node/edge pair.
// Node/edge are adjusted based on the current gravity.
private void MoveToNode(TextContainer tree, TextTreeNode node, ElementEdge edge)
{
RepositionForGravity(ref node, ref edge, GetGravityInternal());
_tree = tree;
SetNodeAndEdge(AdjustRefCounts(node, edge, _node, this.Edge), edge);
_generation = tree.PositionGeneration;
}
// Does a deep extract of all top-level TextElements between two positions.
// Returns the combined symbol count of all extracted elements.
// Each extracted element (and its children) are moved into a private tree.
// This insures that outside references to the TextElement can still use
// the TextElements freely, inserting or removing content, etc.
//
// Also calls AddLogicalChild on any top-level UIElements encountered.
private int CutTopLevelLogicalNodes(TextTreeNode containingNode, TextPointer startPosition, TextPointer endPosition, out int charCount)
{
SplayTreeNode node;
SplayTreeNode nextNode;
SplayTreeNode stopNode;
TextTreeTextElementNode elementNode;
TextTreeObjectNode uiElementNode;
char[] elementText;
int symbolCount;
TextContainer tree;
TextPointer newTreeStart;
DependencyObject logicalParent;
object currentLogicalChild;
Invariant.Assert(startPosition.GetScopingNode() == endPosition.GetScopingNode(), "startPosition/endPosition not in same sibling tree!");
node = startPosition.GetAdjacentSiblingNode(LogicalDirection.Forward);
stopNode = endPosition.GetAdjacentSiblingNode(LogicalDirection.Forward);
symbolCount = 0;
charCount = 0;
logicalParent = containingNode.GetLogicalTreeNode();
while (node != stopNode)
{
currentLogicalChild = null;
// Get the next node now, before we extract any TextElementNodes.
nextNode = node.GetNextNode();
elementNode = node as TextTreeTextElementNode;
if (elementNode != null)
{
// Grab the IMECharCount before we modify the node.
// This value depends on the node's current context.
int imeCharCountInOriginalContainer = elementNode.IMECharCount;
// Cut and record the matching symbols.
elementText = TextTreeText.CutText(_rootNode.RootTextBlock, elementNode.GetSymbolOffset(this.Generation), elementNode.SymbolCount);
// Rip the element out of its sibling tree.
// textElementNode.TextElement's TextElementNode will be updated
// with a deep copy of all contained nodes. We need a deep copy
// to ensure the new element/tree has no TextPointer references.
ExtractElementFromSiblingTree(containingNode, elementNode, true /* deep */);
// Assert that the TextElement now points to a new TextElementNode, not the original one.
Invariant.Assert(elementNode.TextElement.TextElementNode != elementNode);
// We want to start referring to the copied node, update elementNode.
elementNode = elementNode.TextElement.TextElementNode;
UpdateContainerSymbolCount(containingNode, -elementNode.SymbolCount, -imeCharCountInOriginalContainer);
NextGeneration(true /* deletedContent */);
// Stick it in a private tree so it's safe for the outside world to play with.
tree = new TextContainer(null, false /* plainTextOnly */);
newTreeStart = tree.Start;
tree.InsertElementToSiblingTree(newTreeStart, newTreeStart, elementNode);
Invariant.Assert(elementText.Length == elementNode.SymbolCount);
tree.UpdateContainerSymbolCount(elementNode.GetContainingNode(), elementNode.SymbolCount, elementNode.IMECharCount);
tree.DemandCreateText();
TextTreeText.InsertText(tree.RootTextBlock, 1 /* symbolOffset */, elementText);
tree.NextGeneration(false /* deletedContent */);
currentLogicalChild = elementNode.TextElement;
// Keep a running total of how many symbols we've removed.
symbolCount += elementNode.SymbolCount;
charCount += imeCharCountInOriginalContainer;
}
else
{
uiElementNode = node as TextTreeObjectNode;
if (uiElementNode != null)
{
currentLogicalChild = uiElementNode.EmbeddedElement;
}
}
// Remove the child from the logical tree
LogicalTreeHelper.RemoveLogicalChild(logicalParent, currentLogicalChild);
node = nextNode;
}
if (symbolCount > 0)
{
startPosition.SyncToTreeGeneration();
endPosition.SyncToTreeGeneration();
}
return symbolCount;
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// Create a new undo unit instance.
internal TextTreeUndoUnit(TextContainer tree, int symbolOffset)
{
_tree = tree;
_symbolOffset = symbolOffset;
_treeContentHashCode = _tree.GetContentHashCode();
}
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Creates a new instance.
internal ExtractChangeEventArgs(TextContainer textTree, TextPointer startPosition, TextTreeTextElementNode node,
TextTreeTextElementNode newFirstIMEVisibleNode, TextTreeTextElementNode formerFirstIMEVisibleNode, int charCount, int childCharCount)
{
_textTree = textTree;
_startPosition = startPosition;
_symbolCount = node.SymbolCount;
_charCount = charCount;
_childCharCount = childCharCount;
_newFirstIMEVisibleNode = newFirstIMEVisibleNode;
_formerFirstIMEVisibleNode = formerFirstIMEVisibleNode;
}
// ------------------------------------------------------------------
// Make sure that complex content is enabled.
// ------------------------------------------------------------------
private void EnsureComplexContent(ITextContainer textContainer)
{
if (_complexContent == null)
{
if (textContainer == null)
{
textContainer = new TextContainer(IsContentPresenterContainer ? null : this, false /* plainTextOnly */);
}
_complexContent = new ComplexContent(this, textContainer, false, Text);
_contentCache = null;
if (CheckFlags(Flags.FormattedOnce))
{
// If we've already measured at least once, hook up the TextContainer
// listeners now.
Invariant.Assert(!CheckFlags(Flags.PendingTextContainerEventInit));
InitializeTextContainerListeners();
// Line layout data cached up to this point will become invalid
// becasue of content structure change (implicit Run added).
// So we need to clear the cache - we call InvalidateMeasure for this
// purpose. However, we do not want to produce a side effect
// of making layout invalid as a result of touching ContentStart/ContentEnd
// and other properties. For that we need to UpdateLayout when it was
// dirtied by our switch.
bool wasLayoutValid = this.IsMeasureValid && this.IsArrangeValid;
InvalidateMeasure();
InvalidateVisual(); //ensure re-rendering too
if (wasLayoutValid)
{
UpdateLayout();
}
}
else
{
// Otherwise, wait until our first measure.
// This lets us skip the work for all content invalidation
// during load, before the first measure.
SetFlags(true, Flags.PendingTextContainerEventInit);
}
}
}
/// <summary>
/// FlowDocument constructor with TextContainer.
/// </summary>
internal FlowDocument(TextContainer textContainer)
: base()
{
Initialize(textContainer);
}
// Called by the TextPointer ctor. Initializes this instance.
private void Initialize(TextContainer tree, TextTreeNode node, ElementEdge edge, LogicalDirection gravity, uint generation,
bool caretUnitBoundaryCache, bool isCaretUnitBoundaryCacheValid, uint layoutGeneration)
{
_tree = tree;
// Fixup of the target node based on gravity.
// Positions always cling to a node edge that matches their gravity,
// so that insert ops never affect the position.
RepositionForGravity(ref node, ref edge, gravity);
SetNodeAndEdge(node.IncrementReferenceCount(edge), edge);
_generation = generation;
this.CaretUnitBoundaryCache = caretUnitBoundaryCache;
this.IsCaretUnitBoundaryCacheValid = isCaretUnitBoundaryCacheValid;
_layoutGeneration = layoutGeneration;
VerifyFlags();
tree.AssertTree();
AssertState();
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// Creates a new undo unit instance.
// symbolOffset should be just before the start edge of the TextElement to remove.
// If deep is true, this unit will undo not only the scoping element
// insert, but also all content scoped by the element.
internal TextTreeInsertElementUndoUnit(TextContainer tree, int symbolOffset, bool deep) : base(tree, symbolOffset)
{
_deep = deep;
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// Create a new undo unit instance.
// symbolOffset and symbolCount track the offset of the inserted content
// and its symbol count, respectively.
internal TextTreeInsertUndoUnit(TextContainer tree, int symbolOffset, int symbolCount) : base(tree, symbolOffset)
{
Invariant.Assert(symbolCount > 0, "Creating no-op insert undo unit!");
_symbolCount = symbolCount;
}
/// <summary>
/// CreateTextBlock - Creates a text block, adds as visual child, databinds properties and sets up appropriate event listener.
/// </summary>
private void CreateTextBlock()
{
_textContainer = new TextContainer(this, false /* plainTextOnly */);
_textBlock = new TextBlock();
AddVisualChild(_textBlock);
_textBlock.IsContentPresenterContainer = true;
_textBlock.SetTextContainer(_textContainer);
InitializeTextContainerListener();
}
// Creates a new TextPointer instance.
internal TextPointer(TextContainer textContainer, int offset, LogicalDirection direction)
{
SplayTreeNode node;
ElementEdge edge;
if (offset < 1 || offset > textContainer.InternalSymbolCount - 1)
{
throw new ArgumentException(SR.Get(SRID.BadDistance));
}
textContainer.GetNodeAndEdgeAtOffset(offset, out node, out edge);
Initialize(textContainer, (TextTreeNode)node, edge, direction, textContainer.PositionGeneration, false, false, textContainer.LayoutGeneration);
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
// Create a new undo unit instance.
// symbolOffset is where property values will be set.
internal TextTreePropertyUndoUnit(TextContainer tree, int symbolOffset, PropertyRecord propertyRecord) : base(tree, symbolOffset)
{
_propertyRecord = propertyRecord;
}
/// <summary>
/// Initialize FlowDocument.
/// </summary>
/// <param name="textContainer"></param>
private void Initialize(TextContainer textContainer)
{
if (textContainer == null)
{
// Create text tree that contains content of the element.
textContainer = new TextContainer(this, false /* plainTextOnly */);
}
// Create structural cache object
_structuralCache = new StructuralCache(this, textContainer);
// Get rid of the current formatter.
if (_formatter != null)
{
_formatter.Suspend();
_formatter = null;
}
}
// Returns the symbol offset within the TextContainer of this Position.
internal static int GetSymbolOffset(TextContainer tree, TextTreeNode node, ElementEdge edge)
{
int offset;
switch (edge)
{
case ElementEdge.BeforeStart:
offset = node.GetSymbolOffset(tree.Generation);
break;
case ElementEdge.AfterStart:
offset = node.GetSymbolOffset(tree.Generation) + 1;
break;
case ElementEdge.BeforeEnd:
offset = node.GetSymbolOffset(tree.Generation) + node.SymbolCount - 1;
break;
case ElementEdge.AfterEnd:
offset = node.GetSymbolOffset(tree.Generation) + node.SymbolCount;
break;
default:
Invariant.Assert(false, "Unknown value for position edge");
offset = 0;
break;
}
return offset;
}
// Demand creates a TextContainer if no tree is associated with this instance.
// Otherwise returns the exisiting tree, and clears the tree's DeadPositionList.
private TextContainer EnsureTextContainer()
{
TextContainer tree;
TextPointer start;
if (this.IsInTree)
{
tree = _textElementNode.GetTextTree();
tree.EmptyDeadPositionList();
}
else
{
tree = new TextContainer(null, false /* plainTextOnly */);
start = tree.Start;
tree.BeginChange();
try
{
tree.InsertElementInternal(start, start, this);
}
finally
{
// No event will be raised, since we know there are no listeners yet!
tree.EndChange();
}
Invariant.Assert(this.IsInTree);
}
return tree;
}
// Creates a new TextPointer instance.
internal TextPointer(TextContainer tree, TextTreeNode node, ElementEdge edge, LogicalDirection direction)
{
Initialize(tree, node, edge, direction, tree.PositionGeneration, false, false, tree.LayoutGeneration);
}
// Adds a TextTreeExtractElementUndoUnit to the open parent undo unit, if any.
// Called by TextContainer.ExtractElement.
internal static TextTreeExtractElementUndoUnit CreateExtractElementUndoUnit(TextContainer tree, TextTreeTextElementNode elementNode)
{
UndoManager undoManager;
TextTreeExtractElementUndoUnit undoUnit;
undoManager = GetOrClearUndoManager(tree);
if (undoManager == null)
return null;
undoUnit = new TextTreeExtractElementUndoUnit(tree, elementNode);
undoManager.Add(undoUnit);
return undoUnit;
}
internal static int GetTextInRun(TextContainer textContainer, int symbolOffset, TextTreeTextNode textNode, int nodeOffset, LogicalDirection direction, char[] textBuffer, int startIndex, int count)
{
int skipCount;
int finalCount;
if (textBuffer == null)
{
throw new ArgumentNullException("textBuffer");
}
if (startIndex < 0)
{
throw new ArgumentException(SR.Get(SRID.NegativeValue, "startIndex"));
}
if (startIndex > textBuffer.Length)
{
throw new ArgumentException(SR.Get(SRID.StartIndexExceedsBufferSize, startIndex, textBuffer.Length));
}
if (count < 0)
{
throw new ArgumentException(SR.Get(SRID.NegativeValue, "count"));
}
if (count > textBuffer.Length - startIndex)
{
throw new ArgumentException(SR.Get(SRID.MaxLengthExceedsBufferSize, count, textBuffer.Length, startIndex));
}
Invariant.Assert(textNode != null, "textNode is expected to be non-null");
textContainer.EmptyDeadPositionList();
if (nodeOffset < 0)
{
skipCount = 0;
}
else
{
skipCount = (direction == LogicalDirection.Forward) ? nodeOffset : textNode.SymbolCount - nodeOffset;
symbolOffset += nodeOffset;
}
finalCount = 0;
// Loop and combine adjacent text nodes into a single run.
// This isn't just a perf optimization. Because text positions
// split text nodes, if we just returned a single node's text
// callers would see strange side effects where position.GetTextLength() !=
// position.GetText() if another position is moved between the calls.
while (textNode != null)
{
// Never return more textBuffer than the text following this position in the current text node.
finalCount += Math.Min(count - finalCount, textNode.SymbolCount - skipCount);
skipCount = 0;
if (finalCount == count)
break;
textNode = ((direction == LogicalDirection.Forward) ? textNode.GetNextNode() : textNode.GetPreviousNode()) as TextTreeTextNode;
}
// If we're reading backwards, need to fixup symbolOffset to point into the node.
if (direction == LogicalDirection.Backward)
{
symbolOffset -= finalCount;
}
if (finalCount > 0) // We may not have allocated textContainer.RootTextBlock if no text was ever inserted.
{
TextTreeText.ReadText(textContainer.RootTextBlock, symbolOffset, finalCount, textBuffer, startIndex);
}
return finalCount;
}