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gecko-dev/editor/libeditor/EditorBase.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_EditorBase_h
#define mozilla_EditorBase_h
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc.
#include "mozilla/EditorDOMPoint.h" // for EditorDOMPoint
#include "mozilla/Maybe.h" // for Maybe
#include "mozilla/OwningNonNull.h" // for OwningNonNull
#include "mozilla/PresShell.h" // for PresShell
#include "mozilla/RangeBoundary.h" // for RawRangeBoundary, RangeBoundary
#include "mozilla/SelectionState.h" // for RangeUpdater, etc.
#include "mozilla/StyleSheet.h" // for StyleSheet
#include "mozilla/WeakPtr.h" // for WeakPtr
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/Text.h"
#include "nsCOMPtr.h" // for already_AddRefed, nsCOMPtr
#include "nsCycleCollectionParticipant.h"
#include "nsGkAtoms.h"
#include "nsIDocument.h" // for nsIDocument
#include "nsIEditor.h" // for nsIEditor, etc.
#include "nsIObserver.h" // for NS_DECL_NSIOBSERVER, etc.
#include "nsIPlaintextEditor.h" // for nsIPlaintextEditor, etc.
#include "nsISelectionController.h" // for nsISelectionController constants
#include "nsISupportsImpl.h" // for EditorBase::Release, etc.
#include "nsIWeakReferenceUtils.h" // for nsWeakPtr
#include "nsLiteralString.h" // for NS_LITERAL_STRING
#include "nsString.h" // for nsCString
#include "nsTArray.h" // for nsTArray and nsAutoTArray
#include "nsWeakReference.h" // for nsSupportsWeakReference
#include "nscore.h" // for nsresult, nsAString, etc.
class nsAtom;
class nsIContent;
class nsIDOMDocument;
class nsIDOMEvent;
class nsIDOMEventListener;
class nsIDOMEventTarget;
class nsIDOMNode;
class nsIDocumentStateListener;
class nsIEditActionListener;
class nsIEditorObserver;
class nsIInlineSpellChecker;
class nsINode;
class nsIPresShell;
class nsISupports;
class nsITransaction;
class nsIWidget;
class nsRange;
class nsTransactionManager;
// This is int32_t instead of int16_t because nsIInlineSpellChecker.idl's
// spellCheckAfterEditorChange is defined to take it as a long.
// XXX EditAction causes unnecessary include of EditorBase from some places.
// Why don't you move this to nsIEditor.idl?
enum class EditAction : int32_t
{
ignore = -1,
none = 0,
undo,
redo,
insertNode,
createNode,
deleteNode,
splitNode,
joinNode,
deleteText = 1003,
// text commands
insertText = 2000,
insertIMEText = 2001,
deleteSelection = 2002,
setTextProperty = 2003,
removeTextProperty = 2004,
outputText = 2005,
setText = 2006,
// html only action
insertBreak = 3000,
makeList = 3001,
indent = 3002,
outdent = 3003,
align = 3004,
makeBasicBlock = 3005,
removeList = 3006,
makeDefListItem = 3007,
insertElement = 3008,
insertQuotation = 3009,
htmlPaste = 3012,
loadHTML = 3013,
resetTextProperties = 3014,
setAbsolutePosition = 3015,
removeAbsolutePosition = 3016,
decreaseZIndex = 3017,
increaseZIndex = 3018
};
inline bool operator!(const EditAction& aOp)
{
return aOp == EditAction::none;
}
namespace mozilla {
class AddStyleSheetTransaction;
class AutoRules;
class AutoSelectionRestorer;
class AutoTransactionsConserveSelection;
class ChangeAttributeTransaction;
class CompositionTransaction;
class CreateElementTransaction;
class DeleteNodeTransaction;
class DeleteTextTransaction;
class EditAggregateTransaction;
class EditTransactionBase;
class ErrorResult;
class HTMLEditor;
class InsertNodeTransaction;
class InsertTextTransaction;
class JoinNodeTransaction;
class PlaceholderTransaction;
class RemoveStyleSheetTransaction;
class SplitNodeResult;
class SplitNodeTransaction;
class TextComposition;
class TextEditor;
namespace dom {
class DataTransfer;
class Element;
class EventTarget;
class Text;
} // namespace dom
namespace widget {
struct IMEState;
} // namespace widget
/**
* CachedWeakPtr stores a pointer to a class which inherits nsIWeakReference.
* If the instance of the class has already been destroyed, this returns
* nullptr. Otherwise, returns cached pointer.
* If class T inherits nsISupports a lot, specify Base explicitly for avoiding
* ambiguous conversion to nsISupports.
*/
template<class T, class Base = nsISupports>
class CachedWeakPtr final
{
public:
CachedWeakPtr<T, Base>()
: mCache(nullptr)
{
}
explicit CachedWeakPtr<T, Base>(T* aObject)
{
mWeakPtr = do_GetWeakReference(static_cast<Base*>(aObject));
mCache = aObject;
}
explicit CachedWeakPtr<T, Base>(const nsCOMPtr<T>& aOther)
{
mWeakPtr = do_GetWeakReference(static_cast<Base*>(aOther.get()));
mCache = aOther;
}
explicit CachedWeakPtr<T, Base>(already_AddRefed<T>& aOther)
{
RefPtr<T> other = aOther;
mWeakPtr = do_GetWeakReference(static_cast<Base*>(other.get()));
mCache = other;
}
CachedWeakPtr<T, Base>& operator=(T* aObject)
{
mWeakPtr = do_GetWeakReference(static_cast<Base*>(aObject));
mCache = aObject;
return *this;
}
CachedWeakPtr<T, Base>& operator=(const nsCOMPtr<T>& aOther)
{
mWeakPtr = do_GetWeakReference(static_cast<Base*>(aOther.get()));
mCache = aOther;
return *this;
}
CachedWeakPtr<T, Base>& operator=(already_AddRefed<T>& aOther)
{
RefPtr<T> other = aOther;
mWeakPtr = do_GetWeakReference(static_cast<Base*>(other.get()));
mCache = other;
return *this;
}
bool IsAlive() const { return mWeakPtr && mWeakPtr->IsAlive(); }
explicit operator bool() const { return mWeakPtr; }
operator T*() const { return get(); }
T* get() const
{
if (mCache && !mWeakPtr->IsAlive()) {
const_cast<CachedWeakPtr<T, Base>*>(this)->mCache = nullptr;
}
return mCache;
}
private:
nsWeakPtr mWeakPtr;
T* MOZ_NON_OWNING_REF mCache;
};
#define kMOZEditorBogusNodeAttrAtom nsGkAtoms::mozeditorbogusnode
#define kMOZEditorBogusNodeValue NS_LITERAL_STRING("TRUE")
/**
* SplitAtEdges is for EditorBase::SplitNodeDeep(),
* HTMLEditor::InsertNodeAtPoint()
*/
enum class SplitAtEdges
{
// EditorBase::SplitNodeDeep() won't split container element nodes at
// their edges. I.e., when split point is start or end of container,
// it won't be split.
eDoNotCreateEmptyContainer,
// EditorBase::SplitNodeDeep() always splits containers even if the split
// point is at edge of a container. E.g., if split point is start of an
// inline element, empty inline element is created as a new left node.
eAllowToCreateEmptyContainer
};
/**
* Implementation of an editor object. it will be the controller/focal point
* for the main editor services. i.e. the GUIManager, publishing, transaction
* manager, event interfaces. the idea for the event interfaces is to have them
* delegate the actual commands to the editor independent of the XPFE
* implementation.
*/
class EditorBase : public nsIEditor
, public nsSupportsWeakReference
{
public:
typedef dom::Element Element;
typedef dom::Selection Selection;
typedef dom::Text Text;
enum IterDirection
{
kIterForward,
kIterBackward
};
/**
* The default constructor. This should suffice. the setting of the
* interfaces is done after the construction of the editor class.
*/
EditorBase();
protected:
/**
* The default destructor. This should suffice. Should this be pure virtual
* for someone to derive from the EditorBase later? I don't believe so.
*/
virtual ~EditorBase();
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(EditorBase, nsIEditor)
bool IsInitialized() const { return !!mDocument; }
already_AddRefed<nsIDOMDocument> GetDOMDocument();
already_AddRefed<nsIDocument> GetDocument();
already_AddRefed<nsIPresShell> GetPresShell();
nsPresContext* GetPresContext()
{
RefPtr<nsIPresShell> presShell = GetPresShell();
return presShell ? presShell->GetPresContext() : nullptr;
}
already_AddRefed<nsIWidget> GetWidget();
nsISelectionController* GetSelectionController() const
{
if (mSelectionController) {
return mSelectionController;
}
if (!mDocument) {
return nullptr;
}
nsIPresShell* presShell = mDocument->GetShell();
if (!presShell) {
return nullptr;
}
nsISelectionController* sc = static_cast<PresShell*>(presShell);
return sc;
}
enum NotificationForEditorObservers
{
eNotifyEditorObserversOfEnd,
eNotifyEditorObserversOfBefore,
eNotifyEditorObserversOfCancel
};
void NotifyEditorObservers(NotificationForEditorObservers aNotification);
// nsIEditor methods
NS_DECL_NSIEDITOR
public:
virtual bool IsModifiableNode(nsINode* aNode);
/**
* InsertTextImpl() inserts aStringToInsert to aPointToInsert or better
* insertion point around it. If aPointToInsert isn't in a text node,
* this method looks for the nearest point in a text node with
* FindBetterInsertionPoint(). If there is no text node, this creates
* new text node and put aStringToInsert to it.
*
* @param aDocument The document of this editor.
* @param aStringToInsert The string to insert.
* @param aPointToInser The point to insert aStringToInsert.
* Must be valid DOM point.
* @param aPointAfterInsertedString
* The point after inserted aStringToInsert.
* So, when this method actually inserts string,
* this is set to a point in the text node.
* Otherwise, this may be set to aPointToInsert.
* @return When this succeeds to insert the string or
* does nothing during composition, returns NS_OK.
* Otherwise, an error code.
*/
virtual nsresult
InsertTextImpl(nsIDocument& aDocument,
const nsAString& aStringToInsert,
const EditorRawDOMPoint& aPointToInsert,
EditorRawDOMPoint* aPointAfterInsertedString = nullptr);
nsresult InsertTextIntoTextNodeImpl(const nsAString& aStringToInsert,
Text& aTextNode, int32_t aOffset,
bool aSuppressIME = false);
nsresult SetTextImpl(Selection& aSelection,
const nsAString& aString,
Text& aTextNode);
NS_IMETHOD DeleteSelectionImpl(EDirection aAction,
EStripWrappers aStripWrappers);
already_AddRefed<Element> DeleteSelectionAndCreateElement(nsAtom& aTag);
/**
* Helper routines for node/parent manipulations.
*/
nsresult DeleteNode(nsINode* aNode);
/**
* InsertNode() inserts aContentToInsert before the child specified by
* aPointToInsert.
*
* @param aContentToInsert The node to be inserted.
* @param aPointToInsert The insertion point of aContentToInsert.
* If this refers end of the container, the
* transaction will append the node to the
* container. Otherwise, will insert the node
* before child node referred by this.
*/
nsresult InsertNode(nsIContent& aContentToInsert,
const EditorRawDOMPoint& aPointToInsert);
enum ECloneAttributes { eDontCloneAttributes, eCloneAttributes };
already_AddRefed<Element> ReplaceContainer(Element* aOldContainer,
nsAtom* aNodeType,
nsAtom* aAttribute = nullptr,
const nsAString* aValue = nullptr,
ECloneAttributes aCloneAttributes
= eDontCloneAttributes);
void CloneAttributes(Element* aDest, Element* aSource);
nsresult RemoveContainer(nsIContent* aNode);
already_AddRefed<Element> InsertContainerAbove(nsIContent* aNode,
nsAtom* aNodeType,
nsAtom* aAttribute = nullptr,
const nsAString* aValue =
nullptr);
/**
* SplitNode() creates a transaction to create a new node (left node)
* identical to an existing node (right node), and split the contents
* between the same point in both nodes, then, execute the transaction.
*
* @param aStartOfRightNode The point to split. Its container will be
* the right node, i.e., become the new node's
* next sibling. And the point will be start
* of the right node.
* @param aError If succeed, returns no error. Otherwise, an
* error.
*/
already_AddRefed<nsIContent>
SplitNode(const EditorRawDOMPoint& aStartOfRightNode,
ErrorResult& aResult);
nsresult JoinNodes(nsINode& aLeftNode, nsINode& aRightNode);
nsresult MoveNode(nsIContent* aNode, nsINode* aParent, int32_t aOffset);
/**
* MoveAllChildren() moves all children of aContainer to before
* aPointToInsert.GetChild().
* See explanation of MoveChildren() for the detail of the behavior.
*
* @param aContainer The container node whose all children should
* be moved.
* @param aPointToInsert The insertion point. The container must not
* be a data node like a text node.
* @param aError The result. If this succeeds to move children,
* returns NS_OK. Otherwise, an error.
*/
void MoveAllChildren(nsINode& aContainer,
const EditorRawDOMPoint& aPointToInsert,
ErrorResult& aError);
/**
* MovePreviousSiblings() moves all siblings before aChild (i.e., aChild
* won't be moved) to before aPointToInsert.GetChild().
* See explanation of MoveChildren() for the detail of the behavior.
*
* @param aChild The node which is next sibling of the last
* node to be moved.
* @param aPointToInsert The insertion point. The container must not
* be a data node like a text node.
* @param aError The result. If this succeeds to move children,
* returns NS_OK. Otherwise, an error.
*/
void MovePreviousSiblings(nsIContent& aChild,
const EditorRawDOMPoint& aPointToInsert,
ErrorResult& aError);
/**
* MoveChildren() moves all children between aFirstChild and aLastChild to
* before aPointToInsert.GetChild().
* If some children are moved to different container while this method
* moves other children, they are just ignored.
* If the child node referred by aPointToInsert is moved to different
* container while this method moves children, returns error.
*
* @param aFirstChild The first child which should be moved to
* aPointToInsert.
* @param aLastChild The last child which should be moved. This
* must be a sibling of aFirstChild and it should
* be positioned after aFirstChild in the DOM tree
* order.
* @param aPointToInsert The insertion point. The container must not
* be a data node like a text node.
* @param aError The result. If this succeeds to move children,
* returns NS_OK. Otherwise, an error.
*/
void MoveChildren(nsIContent& aFirstChild,
nsIContent& aLastChild,
const EditorRawDOMPoint& aPointToInsert,
ErrorResult& aError);
nsresult CloneAttribute(nsAtom* aAttribute, Element* aDestElement,
Element* aSourceElement);
nsresult RemoveAttribute(Element* aElement, nsAtom* aAttribute);
virtual nsresult RemoveAttributeOrEquivalent(Element* aElement,
nsAtom* aAttribute,
bool aSuppressTransaction) = 0;
nsresult SetAttribute(Element* aElement, nsAtom* aAttribute,
const nsAString& aValue);
virtual nsresult SetAttributeOrEquivalent(Element* aElement,
nsAtom* aAttribute,
const nsAString& aValue,
bool aSuppressTransaction) = 0;
/**
* Method to replace certain CreateElementNS() calls.
*
* @param aTag Tag you want.
*/
already_AddRefed<Element> CreateHTMLContent(nsAtom* aTag);
/**
* Creates text node which is marked as "maybe modified frequently".
*/
static already_AddRefed<nsTextNode> CreateTextNode(nsIDocument& aDocument,
const nsAString& aData);
/**
* IME event handlers.
*/
virtual nsresult BeginIMEComposition(WidgetCompositionEvent* aEvent);
virtual nsresult UpdateIMEComposition(
WidgetCompositionEvent* aCompositionChangeEvet) = 0;
void EndIMEComposition();
/**
* Commit composition if there is.
* Note that when there is a composition, this requests to commit composition
* to native IME. Therefore, when there is composition, this can do anything.
* For example, the editor instance, the widget or the process itself may
* be destroyed.
*/
nsresult CommitComposition();
void SwitchTextDirectionTo(uint32_t aDirection);
RangeUpdater& RangeUpdaterRef() { return mRangeUpdater; }
protected:
nsresult DetermineCurrentDirection();
void FireInputEvent();
/**
* Create an element node whose name is aTag at before aPointToInsert. When
* this succeed to create an element node, this sets aPointToInsert to the
* new element because the relation of child and offset may be broken.
* If the caller needs to collapse the selection to next to the new element
* node, it should call |aPointToInsert.AdvanceOffset()| after calling this.
*
* @param aTag The element name to create.
* @param aPointToInsert The insertion point of new element. If this refers
* end of the container or after, the transaction
* will append the element to the container.
* Otherwise, will insert the element before the
* child node referred by this.
* @return The created new element node.
*/
already_AddRefed<Element> CreateNode(nsAtom* aTag,
const EditorRawDOMPoint& aPointToInsert);
/**
* Create an aggregate transaction for delete selection. The result may
* include DeleteNodeTransactions and/or DeleteTextTransactions as its
* children.
*
* @param aAction The action caused removing the selection.
* @param aRemovingNode The node to be removed.
* @param aOffset The start offset of the range in aRemovingNode.
* @param aLength The length of the range in aRemovingNode.
* @return If it can remove the selection, returns an
* aggregate transaction which has some
* DeleteNodeTransactions and/or
* DeleteTextTransactions as its children.
*/
already_AddRefed<EditAggregateTransaction>
CreateTxnForDeleteSelection(EDirection aAction,
nsINode** aNode,
int32_t* aOffset,
int32_t* aLength);
/**
* Create a transaction for removing the nodes and/or text in aRange.
*
* @param aRangeToDelete The range to be removed.
* @param aAction The action caused removing the range.
* @param aRemovingNode The node to be removed.
* @param aOffset The start offset of the range in aRemovingNode.
* @param aLength The length of the range in aRemovingNode.
* @return The transaction to remove the range. Its type
* is DeleteNodeTransaction or
* DeleteTextTransaction.
*/
already_AddRefed<EditTransactionBase>
CreateTxnForDeleteRange(nsRange* aRangeToDelete,
EDirection aAction,
nsINode** aRemovingNode,
int32_t* aOffset,
int32_t* aLength);
nsresult DeleteText(nsGenericDOMDataNode& aElement,
uint32_t aOffset, uint32_t aLength);
/**
* This method first deletes the selection, if it's not collapsed. Then if
* the selection lies in a CharacterData node, it splits it. If the
* selection is at this point collapsed in a CharacterData node, it's
* adjusted to be collapsed right before or after the node instead (which is
* always possible, since the node was split).
*/
nsresult DeleteSelectionAndPrepareToCreateNode();
/**
* Called after a transaction is done successfully.
*/
void DoAfterDoTransaction(nsITransaction *aTxn);
/**
* Called after a transaction is undone successfully.
*/
void DoAfterUndoTransaction();
/**
* Called after a transaction is redone successfully.
*/
void DoAfterRedoTransaction();
// Note that aSelection is optional and can be nullptr.
nsresult DoTransaction(Selection* aSelection,
nsITransaction* aTxn);
enum TDocumentListenerNotification
{
eDocumentCreated,
eDocumentToBeDestroyed,
eDocumentStateChanged
};
/**
* Tell the doc state listeners that the doc state has changed.
*/
nsresult NotifyDocumentListeners(
TDocumentListenerNotification aNotificationType);
/**
* Make the given selection span the entire document.
*/
virtual nsresult SelectEntireDocument(Selection* aSelection);
/**
* Helper method for scrolling the selection into view after
* an edit operation. aScrollToAnchor should be true if you
* want to scroll to the point where the selection was started.
* If false, it attempts to scroll the end of the selection into view.
*
* Editor methods *should* call this method instead of the versions
* in the various selection interfaces, since this version makes sure
* that the editor's sync/async settings for reflowing, painting, and
* scrolling match.
*/
nsresult ScrollSelectionIntoView(bool aScrollToAnchor);
virtual bool IsBlockNode(nsINode* aNode);
/**
* Helper for GetPreviousNodeInternal() and GetNextNodeInternal().
*/
nsIContent* FindNextLeafNode(nsINode* aCurrentNode,
bool aGoForward,
bool bNoBlockCrossing);
nsIContent* FindNode(nsINode* aCurrentNode,
bool aGoForward,
bool aEditableNode,
bool bNoBlockCrossing);
/**
* Get the node immediately previous node of aNode.
* @param atNode The node from which we start the search.
* @param aFindEditableNode If true, only return an editable node.
* @param aNoBlockCrossing If true, don't move across "block" nodes,
* whatever that means.
* @return The node that occurs before aNode in
* the tree, skipping non-editable nodes if
* aFindEditableNode is true. If there is no
* previous node, returns nullptr.
*/
nsIContent* GetPreviousNodeInternal(nsINode& aNode,
bool aFindEditableNode,
bool aNoBlockCrossing);
/**
* And another version that takes a point in DOM tree rather than a node.
*/
nsIContent* GetPreviousNodeInternal(const EditorRawDOMPoint& aPoint,
bool aFindEditableNode,
bool aNoBlockCrossing);
/**
* Get the node immediately next node of aNode.
* @param aNode The node from which we start the search.
* @param aFindEditableNode If true, only return an editable node.
* @param aNoBlockCrossing If true, don't move across "block" nodes,
* whatever that means.
* @return The node that occurs after aNode in the
* tree, skipping non-editable nodes if
* aFindEditableNode is true. If there is no
* next node, returns nullptr.
*/
nsIContent* GetNextNodeInternal(nsINode& aNode,
bool aFindEditableNode,
bool bNoBlockCrossing);
/**
* And another version that takes a point in DOM tree rather than a node.
*/
nsIContent* GetNextNodeInternal(const EditorRawDOMPoint& aPoint,
bool aFindEditableNode,
bool aNoBlockCrossing);
virtual nsresult InstallEventListeners();
virtual void CreateEventListeners();
virtual void RemoveEventListeners();
/**
* Return true if spellchecking should be enabled for this editor.
*/
bool GetDesiredSpellCheckState();
bool CanEnableSpellCheck()
{
// Check for password/readonly/disabled, which are not spellchecked
// regardless of DOM. Also, check to see if spell check should be skipped
// or not.
return !IsPasswordEditor() && !IsReadonly() && !IsDisabled() &&
!ShouldSkipSpellCheck();
}
/**
* EnsureComposition() should be called by composition event handlers. This
* tries to get the composition for the event and set it to mComposition.
* However, this may fail because the composition may be committed before
* the event comes to the editor.
*
* @return true if there is a composition. Otherwise, for example,
* a composition event handler in web contents moved focus
* for committing the composition, returns false.
*/
bool EnsureComposition(WidgetCompositionEvent* aCompositionEvent);
nsresult GetSelection(SelectionType aSelectionType,
nsISelection** aSelection);
/**
* (Begin|End)PlaceholderTransaction() are called by AutoPlaceholderBatch.
* This set of methods are similar to the (Begin|End)Transaction(), but do
* not use the transaction managers batching feature. Instead we use a
* placeholder transaction to wrap up any further transaction while the
* batch is open. The advantage of this is that placeholder transactions
* can later merge, if needed. Merging is unavailable between transaction
* manager batches.
*/
void BeginPlaceholderTransaction(nsAtom* aTransactionName);
void EndPlaceholderTransaction();
public:
/**
* All editor operations which alter the doc should be prefaced
* with a call to StartOperation, naming the action and direction.
*/
NS_IMETHOD StartOperation(EditAction opID,
nsIEditor::EDirection aDirection);
/**
* All editor operations which alter the doc should be followed
* with a call to EndOperation.
*/
NS_IMETHOD EndOperation();
/**
* Routines for managing the preservation of selection across
* various editor actions.
*/
bool ArePreservingSelection();
void PreserveSelectionAcrossActions(Selection* aSel);
nsresult RestorePreservedSelection(Selection* aSel);
void StopPreservingSelection();
/**
* SplitNodeImpl() creates a new node (left node) identical to an existing
* node (right node), and split the contents between the same point in both
* nodes.
*
* @param aStartOfRightNode The point to split. Its container will be
* the right node, i.e., become the new node's
* next sibling. And the point will be start
* of the right node.
* @param aNewLeftNode The new node called as left node, so, this
* becomes the container of aPointToSplit's
* previous sibling.
* @param aError Must have not already failed.
* If succeed to insert aLeftNode before the
* right node and remove unnecessary contents
* (and collapse selection at end of the left
* node if necessary), returns no error.
* Otherwise, an error.
*/
void SplitNodeImpl(const EditorDOMPoint& aStartOfRightNode,
nsIContent& aNewLeftNode,
ErrorResult& aError);
/**
* JoinNodes() takes 2 nodes and merge their content|children.
* @param aNodeToKeep The node that will remain after the join.
* @param aNodeToJoin The node that will be joined with aNodeToKeep.
* There is no requirement that the two nodes be of the
* same type.
* @param aParent The parent of aNodeToKeep
*/
nsresult JoinNodesImpl(nsINode* aNodeToKeep,
nsINode* aNodeToJoin,
nsINode* aParent);
/**
* Return the offset of aChild in aParent. Asserts fatally if parent or
* child is null, or parent is not child's parent.
* FYI: aChild must not be being removed from aParent. In such case, these
* methods may return wrong index if aChild doesn't have previous
* sibling or next sibling.
*/
static int32_t GetChildOffset(nsIDOMNode* aChild,
nsIDOMNode* aParent);
static int32_t GetChildOffset(nsINode* aChild,
nsINode* aParent);
/**
* Set outOffset to the offset of aChild in the parent.
* Returns the parent of aChild.
*/
static already_AddRefed<nsIDOMNode> GetNodeLocation(nsIDOMNode* aChild,
int32_t* outOffset);
static nsINode* GetNodeLocation(nsINode* aChild, int32_t* aOffset);
/**
* Returns the number of things inside aNode in the out-param aCount.
* @param aNode is the node to get the length of.
* If aNode is text, returns number of characters.
* If not, returns number of children nodes.
* @param aCount [OUT] the result of the above calculation.
*/
static nsresult GetLengthOfDOMNode(nsIDOMNode *aNode, uint32_t &aCount);
/**
* Get the previous node.
*/
nsIContent* GetPreviousNode(const EditorRawDOMPoint& aPoint)
{
return GetPreviousNodeInternal(aPoint, false, false);
}
nsIContent* GetPreviousEditableNode(const EditorRawDOMPoint& aPoint)
{
return GetPreviousNodeInternal(aPoint, true, false);
}
nsIContent* GetPreviousNodeInBlock(const EditorRawDOMPoint& aPoint)
{
return GetPreviousNodeInternal(aPoint, false, true);
}
nsIContent* GetPreviousEditableNodeInBlock(
const EditorRawDOMPoint& aPoint)
{
return GetPreviousNodeInternal(aPoint, true, true);
}
nsIContent* GetPreviousNode(nsINode& aNode)
{
return GetPreviousNodeInternal(aNode, false, false);
}
nsIContent* GetPreviousEditableNode(nsINode& aNode)
{
return GetPreviousNodeInternal(aNode, true, false);
}
nsIContent* GetPreviousNodeInBlock(nsINode& aNode)
{
return GetPreviousNodeInternal(aNode, false, true);
}
nsIContent* GetPreviousEditableNodeInBlock(nsINode& aNode)
{
return GetPreviousNodeInternal(aNode, true, true);
}
/**
* Get the next node.
*
* Note that methods taking EditorRawDOMPoint behavior includes the
* child at offset as search target. E.g., following code causes infinite
* loop.
*
* EditorRawDOMPoint point(aEditableNode);
* while (nsIContent* content = GetNextEditableNode(point)) {
* // Do something...
* point.Set(content);
* }
*
* Following code must be you expected:
*
* while (nsIContent* content = GetNextEditableNode(point)) {
* // Do something...
* DebugOnly<bool> advanced = point.Advanced();
* MOZ_ASSERT(advanced);
* point.Set(point.GetChild());
* }
*
* On the other hand, the methods taking nsINode behavior must be what
* you want. They start to search the result from next node of the given
* node.
*/
nsIContent* GetNextNode(const EditorRawDOMPoint& aPoint)
{
return GetNextNodeInternal(aPoint, false, false);
}
nsIContent* GetNextEditableNode(const EditorRawDOMPoint& aPoint)
{
return GetNextNodeInternal(aPoint, true, false);
}
nsIContent* GetNextNodeInBlock(const EditorRawDOMPoint& aPoint)
{
return GetNextNodeInternal(aPoint, false, true);
}
nsIContent* GetNextEditableNodeInBlock(
const EditorRawDOMPoint& aPoint)
{
return GetNextNodeInternal(aPoint, true, true);
}
nsIContent* GetNextNode(nsINode& aNode)
{
return GetNextNodeInternal(aNode, false, false);
}
nsIContent* GetNextEditableNode(nsINode& aNode)
{
return GetNextNodeInternal(aNode, true, false);
}
nsIContent* GetNextNodeInBlock(nsINode& aNode)
{
return GetNextNodeInternal(aNode, false, true);
}
nsIContent* GetNextEditableNodeInBlock(nsINode& aNode)
{
return GetNextNodeInternal(aNode, true, true);
}
/**
* Get the rightmost child of aCurrentNode;
* return nullptr if aCurrentNode has no children.
*/
nsIContent* GetRightmostChild(nsINode* aCurrentNode,
bool bNoBlockCrossing = false);
/**
* Get the leftmost child of aCurrentNode;
* return nullptr if aCurrentNode has no children.
*/
nsIContent* GetLeftmostChild(nsINode *aCurrentNode,
bool bNoBlockCrossing = false);
/**
* Returns true if aNode is of the type implied by aTag.
*/
static inline bool NodeIsType(nsIDOMNode* aNode, nsAtom* aTag)
{
return GetTag(aNode) == aTag;
}
/**
* Returns true if aParent can contain a child of type aTag.
*/
bool CanContain(nsINode& aParent, nsIContent& aChild) const;
bool CanContainTag(nsINode& aParent, nsAtom& aTag) const;
bool TagCanContain(nsAtom& aParentTag, nsIContent& aChild) const;
virtual bool TagCanContainTag(nsAtom& aParentTag, nsAtom& aChildTag) const;
/**
* Returns true if aNode is our root node.
*/
bool IsRoot(nsIDOMNode* inNode);
bool IsRoot(nsINode* inNode);
bool IsEditorRoot(nsINode* aNode);
/**
* Returns true if aNode is a descendant of our root node.
*/
bool IsDescendantOfRoot(nsIDOMNode* inNode);
bool IsDescendantOfRoot(nsINode* inNode);
bool IsDescendantOfEditorRoot(nsINode* aNode);
/**
* Returns true if aNode is a container.
*/
virtual bool IsContainer(nsINode* aNode);
/**
* returns true if aNode is an editable node.
*/
bool IsEditable(nsIDOMNode* aNode);
bool IsEditable(nsINode* aNode)
{
NS_ENSURE_TRUE(aNode, false);
if (!aNode->IsContent() || IsMozEditorBogusNode(aNode) ||
!IsModifiableNode(aNode)) {
return false;
}
switch (aNode->NodeType()) {
case nsIDOMNode::ELEMENT_NODE:
// In HTML editors, if we're dealing with an element, then ask it
// whether it's editable.
return mIsHTMLEditorClass ? aNode->IsEditable() : true;
case nsIDOMNode::TEXT_NODE:
// Text nodes are considered to be editable by both typed of editors.
return true;
default:
return false;
}
}
/**
* Returns true if selection is in an editable element and both the range
* start and the range end are editable. E.g., even if the selection range
* includes non-editable elements, returns true when one of common ancestors
* of the range start and the range end is editable. Otherwise, false.
*/
bool IsSelectionEditable();
/**
* Returns true if aNode is a MozEditorBogus node.
*/
bool IsMozEditorBogusNode(nsINode* aNode)
{
return aNode && aNode->IsElement() &&
aNode->AsElement()->AttrValueIs(kNameSpaceID_None,
kMOZEditorBogusNodeAttrAtom, kMOZEditorBogusNodeValue,
eCaseMatters);
}
/**
* Counts number of editable child nodes.
*/
uint32_t CountEditableChildren(nsINode* aNode);
/**
* Find the deep first and last children.
*/
nsINode* GetFirstEditableNode(nsINode* aRoot);
/**
* Returns current composition.
*/
TextComposition* GetComposition() const;
/**
* Returns true if there is composition string and not fixed.
*/
bool IsIMEComposing() const;
/**
* Returns true when inserting text should be a part of current composition.
*/
bool ShouldHandleIMEComposition() const;
/**
* Returns number of undo or redo items. If TransactionManager returns
* unexpected error, returns -1.
*/
int32_t NumberOfUndoItems() const;
int32_t NumberOfRedoItems() const;
/**
* From html rules code - migration in progress.
*/
static nsAtom* GetTag(nsIDOMNode* aNode);
bool NodesSameType(nsIDOMNode* aNode1, nsIDOMNode* aNode2);
virtual bool AreNodesSameType(nsIContent* aNode1, nsIContent* aNode2);
static bool IsTextNode(nsIDOMNode* aNode);
static bool IsTextNode(nsINode* aNode)
{
return aNode->NodeType() == nsIDOMNode::TEXT_NODE;
}
/**
* GetNodeAtRangeOffsetPoint() returns the node at this position in a range,
* assuming that the container is the node itself if it's a text node, or
* the node's parent otherwise.
*/
static nsIContent* GetNodeAtRangeOffsetPoint(nsINode* aContainer,
int32_t aOffset)
{
return GetNodeAtRangeOffsetPoint(RawRangeBoundary(aContainer, aOffset));
}
static nsIContent* GetNodeAtRangeOffsetPoint(const RawRangeBoundary& aPoint);
static nsresult GetStartNodeAndOffset(Selection* aSelection,
nsIDOMNode** outStartNode,
int32_t* outStartOffset);
static nsresult GetStartNodeAndOffset(Selection* aSelection,
nsINode** aStartContainer,
int32_t* aStartOffset);
static EditorRawDOMPoint GetStartPoint(Selection* aSelection);
static nsresult GetEndNodeAndOffset(Selection* aSelection,
nsIDOMNode** outEndNode,
int32_t* outEndOffset);
static nsresult GetEndNodeAndOffset(Selection* aSelection,
nsINode** aEndContainer,
int32_t* aEndOffset);
static EditorRawDOMPoint GetEndPoint(Selection* aSelection);
static nsresult GetEndChildNode(Selection* aSelection,
nsIContent** aEndNode);
#if DEBUG_JOE
static void DumpNode(nsIDOMNode* aNode, int32_t indent = 0);
#endif
Selection* GetSelection(SelectionType aSelectionType =
SelectionType::eNormal)
{
nsISelectionController* sc = GetSelectionController();
if (!sc) {
return nullptr;
}
Selection* selection = sc->GetDOMSelection(ToRawSelectionType(aSelectionType));
return selection;
}
/**
* CollapseSelectionToEnd() collapses the selection to the end of the editor.
*/
nsresult CollapseSelectionToEnd(Selection* aSelection);
/**
* Helpers to add a node to the selection.
* Used by table cell selection methods.
*/
nsresult CreateRange(nsIDOMNode* aStartContainer, int32_t aStartOffset,
nsIDOMNode* aEndContainer, int32_t aEndOffset,
nsRange** aRange);
/**
* Creates a range with just the supplied node and appends that to the
* selection.
*/
nsresult AppendNodeToSelectionAsRange(nsIDOMNode *aNode);
/**
* When you are using AppendNodeToSelectionAsRange(), call this first to
* start a new selection.
*/
nsresult ClearSelection();
nsresult IsPreformatted(nsIDOMNode* aNode, bool* aResult);
/**
* SplitNodeDeep() splits aMostAncestorToSplit deeply.
*
* @param aMostAncestorToSplit The most ancestor node which should be
* split.
* @param aStartOfDeepestRightNode The start point of deepest right node.
* This point must be descendant of
* aMostAncestorToSplit.
* @param aSplitAtEdges Whether the caller allows this to
* create empty container element when
* split point is start or end of an
* element.
* @return SplitPoint() returns split point in
* aMostAncestorToSplit. The point must
* be good to insert something if the
* caller want to do it.
*/
SplitNodeResult
SplitNodeDeep(nsIContent& aMostAncestorToSplit,
const EditorRawDOMPoint& aDeepestStartOfRightNode,
SplitAtEdges aSplitAtEdges);
EditorDOMPoint JoinNodeDeep(nsIContent& aLeftNode,
nsIContent& aRightNode);
nsresult GetString(const nsAString& name, nsAString& value);
void BeginUpdateViewBatch();
virtual nsresult EndUpdateViewBatch();
bool GetShouldTxnSetSelection();
virtual nsresult HandleKeyPressEvent(WidgetKeyboardEvent* aKeyboardEvent);
nsresult HandleInlineSpellCheck(EditAction action,
Selection* aSelection,
nsINode* previousSelectedNode,
uint32_t previousSelectedOffset,
nsINode* aStartContainer,
uint32_t aStartOffset,
nsINode* aEndContainer,
uint32_t aEndOffset);
virtual dom::EventTarget* GetDOMEventTarget() = 0;
/**
* Fast non-refcounting editor root element accessor
*/
Element* GetRoot() const { return mRootElement; }
/**
* Likewise, but gets the editor's root instead, which is different for HTML
* editors.
*/
virtual Element* GetEditorRoot();
/**
* Likewise, but gets the text control element instead of the root for
* plaintext editors.
*/
Element* GetExposedRoot();
/**
* Accessor methods to flags.
*/
uint32_t Flags() const { return mFlags; }
nsresult AddFlags(uint32_t aFlags)
{
const uint32_t kOldFlags = Flags();
const uint32_t kNewFlags = (kOldFlags | aFlags);
if (kNewFlags == kOldFlags) {
return NS_OK;
}
return SetFlags(kNewFlags); // virtual call and may be expensive.
}
nsresult RemoveFlags(uint32_t aFlags)
{
const uint32_t kOldFlags = Flags();
const uint32_t kNewFlags = (kOldFlags & ~aFlags);
if (kNewFlags == kOldFlags) {
return NS_OK;
}
return SetFlags(kNewFlags); // virtual call and may be expensive.
}
nsresult AddAndRemoveFlags(uint32_t aAddingFlags, uint32_t aRemovingFlags)
{
MOZ_ASSERT(!(aAddingFlags & aRemovingFlags),
"Same flags are specified both adding and removing");
const uint32_t kOldFlags = Flags();
const uint32_t kNewFlags = ((kOldFlags | aAddingFlags) & ~aRemovingFlags);
if (kNewFlags == kOldFlags) {
return NS_OK;
}
return SetFlags(kNewFlags); // virtual call and may be expensive.
}
bool IsPlaintextEditor() const
{
return (mFlags & nsIPlaintextEditor::eEditorPlaintextMask) != 0;
}
bool IsSingleLineEditor() const
{
return (mFlags & nsIPlaintextEditor::eEditorSingleLineMask) != 0;
}
bool IsPasswordEditor() const
{
return (mFlags & nsIPlaintextEditor::eEditorPasswordMask) != 0;
}
// FYI: Both IsRightToLeft() and IsLeftToRight() may return false if
// the editor inherits the content node's direction.
bool IsRightToLeft() const
{
return (mFlags & nsIPlaintextEditor::eEditorRightToLeft) != 0;
}
bool IsLeftToRight() const
{
return (mFlags & nsIPlaintextEditor::eEditorLeftToRight) != 0;
}
bool IsReadonly() const
{
return (mFlags & nsIPlaintextEditor::eEditorReadonlyMask) != 0;
}
bool IsDisabled() const
{
return (mFlags & nsIPlaintextEditor::eEditorDisabledMask) != 0;
}
bool IsInputFiltered() const
{
return (mFlags & nsIPlaintextEditor::eEditorFilterInputMask) != 0;
}
bool IsMailEditor() const
{
return (mFlags & nsIPlaintextEditor::eEditorMailMask) != 0;
}
bool IsWrapHackEnabled() const
{
return (mFlags & nsIPlaintextEditor::eEditorEnableWrapHackMask) != 0;
}
bool IsFormWidget() const
{
return (mFlags & nsIPlaintextEditor::eEditorWidgetMask) != 0;
}
bool NoCSS() const
{
return (mFlags & nsIPlaintextEditor::eEditorNoCSSMask) != 0;
}
bool IsInteractionAllowed() const
{
return (mFlags & nsIPlaintextEditor::eEditorAllowInteraction) != 0;
}
bool DontEchoPassword() const
{
return (mFlags & nsIPlaintextEditor::eEditorDontEchoPassword) != 0;
}
bool ShouldSkipSpellCheck() const
{
return (mFlags & nsIPlaintextEditor::eEditorSkipSpellCheck) != 0;
}
bool IsTabbable() const
{
return IsSingleLineEditor() || IsPasswordEditor() || IsFormWidget() ||
IsInteractionAllowed();
}
bool HasIndependentSelection() const
{
return !!mSelectionController;
}
bool IsModifiable() const
{
return !IsReadonly();
}
/**
* IsInEditAction() return true while the instance is handling an edit action.
* Otherwise, false.
*/
bool IsInEditAction() const { return mIsInEditAction; }
/**
* IsSuppressingDispatchingInputEvent() returns true if the editor stops
* dispatching input event. Otherwise, false.
*/
bool IsSuppressingDispatchingInputEvent() const
{
return !mDispatchInputEvent;
}
bool Destroyed() const
{
return mDidPreDestroy;
}
/**
* GetTransactionManager() returns transaction manager associated with the
* editor. This may return nullptr if undo/redo hasn't been enabled.
*/
already_AddRefed<nsITransactionManager> GetTransactionManager() const;
/**
* Get the input event target. This might return null.
*/
virtual already_AddRefed<nsIContent> GetInputEventTargetContent() = 0;
/**
* Get the focused content, if we're focused. Returns null otherwise.
*/
virtual nsIContent* GetFocusedContent();
/**
* Get the focused content for the argument of some IMEStateManager's
* methods.
*/
virtual already_AddRefed<nsIContent> GetFocusedContentForIME();
/**
* Whether the editor is active on the DOM window. Note that when this
* returns true but GetFocusedContent() returns null, it means that this editor was
* focused when the DOM window was active.
*/
virtual bool IsActiveInDOMWindow();
/**
* Whether the aGUIEvent should be handled by this editor or not. When this
* returns false, The aGUIEvent shouldn't be handled on this editor,
* i.e., The aGUIEvent should be handled by another inner editor or ancestor
* elements.
*/
virtual bool IsAcceptableInputEvent(WidgetGUIEvent* aGUIEvent);
/**
* FindSelectionRoot() returns a selection root of this editor when aNode
* gets focus. aNode must be a content node or a document node. When the
* target isn't a part of this editor, returns nullptr. If this is for
* designMode, you should set the document node to aNode except that an
* element in the document has focus.
*/
virtual already_AddRefed<nsIContent> FindSelectionRoot(nsINode* aNode);
/**
* Initializes selection and caret for the editor. If aEventTarget isn't
* a host of the editor, i.e., the editor doesn't get focus, this does
* nothing.
*/
nsresult InitializeSelection(nsIDOMEventTarget* aFocusEventTarget);
/**
* This method has to be called by EditorEventListener::Focus.
* All actions that have to be done when the editor is focused needs to be
* added here.
*/
void OnFocus(nsIDOMEventTarget* aFocusEventTarget);
/**
* Used to insert content from a data transfer into the editable area.
* This is called for each item in the data transfer, with the index of
* each item passed as aIndex.
*/
virtual nsresult InsertFromDataTransfer(dom::DataTransfer* aDataTransfer,
int32_t aIndex,
nsIDOMDocument* aSourceDoc,
nsIDOMNode* aDestinationNode,
int32_t aDestOffset,
bool aDoDeleteSelection) = 0;
virtual nsresult InsertFromDrop(nsIDOMEvent* aDropEvent) = 0;
/**
* GetIMESelectionStartOffsetIn() returns the start offset of IME selection in
* the aTextNode. If there is no IME selection, returns -1.
*/
int32_t GetIMESelectionStartOffsetIn(nsINode* aTextNode);
/**
* FindBetterInsertionPoint() tries to look for better insertion point which
* is typically the nearest text node and offset in it.
*
* @param aPoint Insertion point which the callers found.
* @return Better insertion point if there is. If not returns
* same point as aPoint.
*/
EditorRawDOMPoint FindBetterInsertionPoint(const EditorRawDOMPoint& aPoint);
/**
* HideCaret() hides caret with nsCaret::AddForceHide() or may show carent
* with nsCaret::RemoveForceHide(). This does NOT set visibility of
* nsCaret. Therefore, this is stateless.
*/
void HideCaret(bool aHide);
private:
nsCOMPtr<nsISelectionController> mSelectionController;
nsCOMPtr<nsIDocument> mDocument;
protected:
enum Tristate
{
eTriUnset,
eTriFalse,
eTriTrue
};
// MIME type of the doc we are editing.
nsCString mContentMIMEType;
nsCOMPtr<nsIInlineSpellChecker> mInlineSpellChecker;
RefPtr<nsTransactionManager> mTxnMgr;
// Cached root node.
nsCOMPtr<Element> mRootElement;
// The form field as an event receiver.
nsCOMPtr<dom::EventTarget> mEventTarget;
nsCOMPtr<nsIDOMEventListener> mEventListener;
// Strong reference to placeholder for begin/end batch purposes.
RefPtr<PlaceholderTransaction> mPlaceholderTransaction;
// Name of placeholder transaction.
nsAtom* mPlaceholderName;
// Saved selection state for placeholder transaction batching.
mozilla::Maybe<SelectionState> mSelState;
// IME composition this is not null between compositionstart and
// compositionend.
RefPtr<TextComposition> mComposition;
// Listens to all low level actions on the doc.
typedef AutoTArray<OwningNonNull<nsIEditActionListener>, 5>
AutoActionListenerArray;
AutoActionListenerArray mActionListeners;
// Just notify once per high level change.
typedef AutoTArray<OwningNonNull<nsIEditorObserver>, 3>
AutoEditorObserverArray;
AutoEditorObserverArray mEditorObservers;
// Listen to overall doc state (dirty or not, just created, etc.).
typedef AutoTArray<OwningNonNull<nsIDocumentStateListener>, 1>
AutoDocumentStateListenerArray;
AutoDocumentStateListenerArray mDocStateListeners;
// Cached selection for AutoSelectionRestorer.
SelectionState mSavedSel;
// Utility class object for maintaining preserved ranges.
RangeUpdater mRangeUpdater;
// Number of modifications (for undo/redo stack).
uint32_t mModCount;
// Behavior flags. See nsIPlaintextEditor.idl for the flags we use.
uint32_t mFlags;
int32_t mUpdateCount;
// Nesting count for batching.
int32_t mPlaceholderBatch;
// The current editor action.
EditAction mAction;
// The current direction of editor action.
EDirection mDirection;
// -1 = not initialized
int8_t mDocDirtyState;
// A Tristate value.
uint8_t mSpellcheckCheckboxState;
// Turn off for conservative selection adjustment by transactions.
bool mShouldTxnSetSelection;
// Whether PreDestroy has been called.
bool mDidPreDestroy;
// Whether PostCreate has been called.
bool mDidPostCreate;
bool mDispatchInputEvent;
// True while the instance is handling an edit action.
bool mIsInEditAction;
// Whether caret is hidden forcibly.
bool mHidingCaret;
// Whether spellchecker dictionary is initialized after focused.
bool mSpellCheckerDictionaryUpdated;
// Whether we are an HTML editor class.
bool mIsHTMLEditorClass;
friend bool NSCanUnload(nsISupports* serviceMgr);
friend class AutoPlaceholderBatch;
friend class AutoRules;
friend class AutoSelectionRestorer;
friend class AutoTransactionsConserveSelection;
friend class RangeUpdater;
friend class nsIEditor;
};
} // namespace mozilla
mozilla::EditorBase*
nsIEditor::AsEditorBase()
{
return static_cast<mozilla::EditorBase*>(this);
}
const mozilla::EditorBase*
nsIEditor::AsEditorBase() const
{
return static_cast<const mozilla::EditorBase*>(this);
}
#endif // #ifndef mozilla_EditorBase_h
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