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gecko-dev/editor/libeditor/TextEditor.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_TextEditor_h
#define mozilla_TextEditor_h
#include "mozilla/EditorBase.h"
#include "mozilla/TextControlState.h"
#include "mozilla/UniquePtr.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsINamed.h"
#include "nsISupportsImpl.h"
#include "nsITimer.h"
#include "nscore.h"
class nsIContent;
class nsIDocumentEncoder;
class nsIOutputStream;
class nsIPrincipal;
class nsISelectionController;
class nsITransferable;
namespace mozilla {
class DeleteNodeTransaction;
class InsertNodeTransaction;
enum class EditSubAction : int32_t;
namespace dom {
class Selection;
} // namespace dom
/**
* The text editor implementation.
* Use to edit text document represented as a DOM tree.
*/
class TextEditor final : public EditorBase,
public nsITimerCallback,
public nsINamed {
public:
/****************************************************************************
* NOTE: DO NOT MAKE YOUR NEW METHODS PUBLIC IF they are called by other
* classes under libeditor except EditorEventListener and
* HTMLEditorEventListener because each public method which may fire
* eEditorInput event will need to instantiate new stack class for
* managing input type value of eEditorInput and cache some objects
* for smarter handling. In other words, when you add new root
* method to edit the DOM tree, you can make your new method public.
****************************************************************************/
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(TextEditor, EditorBase)
TextEditor();
/**
* Note that TextEditor::Init() shouldn't cause running script synchronously.
* So, `MOZ_CAN_RUN_SCRIPT_BOUNDARY` is safe here.
*
* @param aDocument The document which aAnonymousDivElement belongs to.
* @param aAnonymousDivElement
* The root editable element for this editor.
* @param aSelectionController
* The selection controller for independent selections
* in the `<input>` or `<textarea>` element.
* @param aFlags Some of nsIEditor::eEditor*Mask flags.
* @param aPasswordMaskData
* Set to an instance only when aFlags includes
* `nsIEditor::eEditorPasswordMask`. Otherwise, must be
* `nullptr`.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult
Init(Document& aDocument, Element& aAnonymousDivElement,
nsISelectionController& aSelectionController, uint32_t aFlags,
UniquePtr<PasswordMaskData>&& aPasswordMaskData);
/**
* PostCreate() should be called after Init, and is the time that the editor
* tells its documentStateObservers that the document has been created.
* Note that TextEditor::PostCreate() shouldn't cause running script
* synchronously. So, `MOZ_CAN_RUN_SCRIPT_BOUNDARY` is safe here.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult PostCreate();
/**
* PreDestroy() is called before the editor goes away, and gives the editor a
* chance to tell its documentStateObservers that the document is going away.
* Note that TextEditor::PreDestroy() shouldn't cause running script
* synchronously. So, `MOZ_CAN_RUN_SCRIPT_BOUNDARY` is safe here.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT_BOUNDARY UniquePtr<PasswordMaskData>
PreDestroy();
static TextEditor* GetFrom(nsIEditor* aEditor) {
return aEditor ? aEditor->GetAsTextEditor() : nullptr;
}
static const TextEditor* GetFrom(const nsIEditor* aEditor) {
return aEditor ? aEditor->GetAsTextEditor() : nullptr;
}
NS_DECL_NSITIMERCALLBACK
NS_DECL_NSINAMED
// Overrides of nsIEditor
NS_IMETHOD GetTextLength(uint32_t* aCount) final;
MOZ_CAN_RUN_SCRIPT NS_IMETHOD Paste(int32_t aClipboardType) final {
const nsresult rv = TextEditor::PasteAsAction(aClipboardType, true);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::PasteAsAction() failed");
return rv;
}
// Shouldn't be used internally, but we need these using declarations for
// avoiding warnings of clang.
using EditorBase::CanCopy;
using EditorBase::CanCut;
using EditorBase::CanPaste;
// Overrides of EditorBase
bool IsEmpty() const final;
bool CanPaste(int32_t aClipboardType) const final;
MOZ_CAN_RUN_SCRIPT nsresult PasteTransferableAsAction(
nsITransferable* aTransferable, nsIPrincipal* aPrincipal = nullptr) final;
bool CanPasteTransferable(nsITransferable* aTransferable) final;
MOZ_CAN_RUN_SCRIPT nsresult
HandleKeyPressEvent(WidgetKeyboardEvent* aKeyboardEvent) final;
dom::EventTarget* GetDOMEventTarget() const final;
MOZ_CAN_RUN_SCRIPT nsresult
PasteAsAction(int32_t aClipboardType, bool aDispatchPasteEvent,
nsIPrincipal* aPrincipal = nullptr) final;
MOZ_CAN_RUN_SCRIPT nsresult
PasteAsQuotationAsAction(int32_t aClipboardType, bool aDispatchPasteEvent,
nsIPrincipal* aPrincipal = nullptr) final;
/**
* The maximum number of characters allowed.
* default: -1 (unlimited).
*/
int32_t MaxTextLength() const { return mMaxTextLength; }
void SetMaxTextLength(int32_t aLength) { mMaxTextLength = aLength; }
/**
* Replace existed string with a string.
* This is fast path to replace all string when using single line control.
*
* @param aString The string to be set
* @param aAllowBeforeInputEventCancelable
* Whether `beforeinput` event which will be
* dispatched for this can be cancelable or not.
* @param aPrincipal Set subject principal if it may be called by
* JS. If set to nullptr, will be treated as
* called by system.
*/
MOZ_CAN_RUN_SCRIPT nsresult SetTextAsAction(
const nsAString& aString,
AllowBeforeInputEventCancelable aAllowBeforeInputEventCancelable,
nsIPrincipal* aPrincipal = nullptr);
MOZ_CAN_RUN_SCRIPT nsresult
InsertLineBreakAsAction(nsIPrincipal* aPrincipal = nullptr) final;
/**
* ComputeTextValue() computes plaintext value of this editor. This may be
* too expensive if it's in hot path.
*
* @param aDocumentEncoderFlags Flags of nsIDocumentEncoder.
* @param aCharset Encoding of the document.
*/
nsresult ComputeTextValue(uint32_t aDocumentEncoderFlags,
nsAString& aOutputString) const {
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = ComputeValueInternal(u"text/plain"_ns, aDocumentEncoderFlags,
aOutputString);
if (NS_WARN_IF(NS_FAILED(rv))) {
return EditorBase::ToGenericNSResult(rv);
}
return NS_OK;
}
/**
* The following methods are available only when the instance is a password
* editor. They return whether there is unmasked range or not and range
* start and length.
*/
MOZ_ALWAYS_INLINE bool IsAllMasked() const {
MOZ_ASSERT(IsPasswordEditor());
return !mPasswordMaskData || mPasswordMaskData->IsAllMasked();
}
MOZ_ALWAYS_INLINE uint32_t UnmaskedStart() const {
MOZ_ASSERT(IsPasswordEditor());
return mPasswordMaskData ? mPasswordMaskData->mUnmaskedStart : UINT32_MAX;
}
MOZ_ALWAYS_INLINE uint32_t UnmaskedLength() const {
MOZ_ASSERT(IsPasswordEditor());
return mPasswordMaskData ? mPasswordMaskData->mUnmaskedLength : 0;
}
MOZ_ALWAYS_INLINE uint32_t UnmaskedEnd() const {
MOZ_ASSERT(IsPasswordEditor());
return mPasswordMaskData ? mPasswordMaskData->UnmaskedEnd() : UINT32_MAX;
}
/**
* IsMaskingPassword() returns false when the last caller of `Unmask()`
* didn't want to mask again automatically. When this returns true, user
* input causes masking the password even before timed-out.
*/
bool IsMaskingPassword() const {
MOZ_ASSERT(IsPasswordEditor());
return mPasswordMaskData && mPasswordMaskData->mIsMaskingPassword;
}
/**
* PasswordMask() returns a character which masks each character in password
* fields.
*/
static char16_t PasswordMask();
/**
* If you want to prevent to echo password temporarily, use the following
* methods.
*/
bool EchoingPasswordPrevented() const {
return mPasswordMaskData && mPasswordMaskData->mEchoingPasswordPrevented;
}
void PreventToEchoPassword() {
if (mPasswordMaskData) {
mPasswordMaskData->mEchoingPasswordPrevented = true;
}
}
void AllowToEchoPassword() {
if (mPasswordMaskData) {
mPasswordMaskData->mEchoingPasswordPrevented = false;
}
}
protected: // May be called by friends.
/****************************************************************************
* Some friend classes are allowed to call the following protected methods.
* However, those methods won't prepare caches of some objects which are
* necessary for them. So, if you call them from friend classes, you need
* to make sure that AutoEditActionDataSetter is created.
****************************************************************************/
// Overrides of EditorBase
MOZ_CAN_RUN_SCRIPT nsresult RemoveAttributeOrEquivalent(
Element* aElement, nsAtom* aAttribute, bool aSuppressTransaction) final;
MOZ_CAN_RUN_SCRIPT nsresult SetAttributeOrEquivalent(
Element* aElement, nsAtom* aAttribute, const nsAString& aValue,
bool aSuppressTransaction) final;
using EditorBase::RemoveAttributeOrEquivalent;
using EditorBase::SetAttributeOrEquivalent;
/**
* Replace existed string with aString. Caller must guarantee that there
* is a placeholder transaction which will have the transaction.
*
* @ param aString The string to be set.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult
SetTextAsSubAction(const nsAString& aString);
/**
* MaybeDoAutoPasswordMasking() may mask password if we're doing auto-masking.
*/
void MaybeDoAutoPasswordMasking() {
if (IsPasswordEditor() && IsMaskingPassword()) {
MaskAllCharacters();
}
}
/**
* SetUnmaskRange() is available only when the instance is a password
* editor. This just updates unmask range. I.e., caller needs to
* guarantee to update the layout.
*
* @param aStart First index to show the character.
* If aLength is 0, this value is ignored.
* @param aLength Optional, Length to show characters.
* If UINT32_MAX, it means unmasking all characters after
* aStart.
* If 0, it means that masking all characters.
* @param aTimeout Optional, specify milliseconds to hide the unmasked
* characters after this call.
* If 0, it means this won't mask the characters
* automatically.
* If aLength is 0, this value is ignored.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult SetUnmaskRange(
uint32_t aStart, uint32_t aLength = UINT32_MAX, uint32_t aTimeout = 0) {
return SetUnmaskRangeInternal(aStart, aLength, aTimeout, false, false);
}
/**
* SetUnmaskRangeAndNotify() is available only when the instance is a
* password editor. This updates unmask range and notifying the text frame
* to update the visible characters.
*
* @param aStart First index to show the character.
* If UINT32_MAX, it means masking all.
* @param aLength Optional, Length to show characters.
* If UINT32_MAX, it means unmasking all characters after
* aStart.
* @param aTimeout Optional, specify milliseconds to hide the unmasked
* characters after this call.
* If 0, it means this won't mask the characters
* automatically.
* If aLength is 0, this value is ignored.
*/
MOZ_CAN_RUN_SCRIPT nsresult SetUnmaskRangeAndNotify(
uint32_t aStart, uint32_t aLength = UINT32_MAX, uint32_t aTimeout = 0) {
return SetUnmaskRangeInternal(aStart, aLength, aTimeout, true, false);
}
/**
* MaskAllCharacters() is an alias of SetUnmaskRange() to mask all characters.
* In other words, this removes existing unmask range.
* After this is called, TextEditor starts masking password automatically.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult MaskAllCharacters() {
if (!mPasswordMaskData) {
return NS_OK; // Already we don't have masked range data.
}
return SetUnmaskRangeInternal(UINT32_MAX, 0, 0, false, true);
}
/**
* MaskAllCharactersAndNotify() is an alias of SetUnmaskRangeAndNotify() to
* mask all characters and notifies the text frame. In other words, this
* removes existing unmask range.
* After this is called, TextEditor starts masking password automatically.
*/
MOZ_CAN_RUN_SCRIPT nsresult MaskAllCharactersAndNotify() {
return SetUnmaskRangeInternal(UINT32_MAX, 0, 0, true, true);
}
/**
* WillDeleteText() is called before `DeleteTextTransaction` or something
* removes text in a text node. Note that this won't be called if the
* instance is `HTMLEditor` since supporting it makes the code complicated
* due to mutation events.
*
* @param aCurrentLength Current text length of the node.
* @param aRemoveStartOffset Start offset of the range to be removed.
* @param aRemoveLength Length of the range to be removed.
*/
void WillDeleteText(uint32_t aCurrentLength, uint32_t aRemoveStartOffset,
uint32_t aRemoveLength);
/**
* DidInsertText() is called after `InsertTextTransaction` or something
* inserts text into a text node. Note that this won't be called if the
* instance is `HTMLEditor` since supporting it makes the code complicated
* due to mutatione events.
*
* @param aNewLength New text length after the insertion.
* @param aInsertedOffset Start offset of the inserted text.
* @param aInsertedLength Length of the inserted text.
* @return NS_OK or NS_ERROR_EDITOR_DESTROYED.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult DidInsertText(
uint32_t aNewLength, uint32_t aInsertedOffset, uint32_t aInsertedLength);
protected: // edit sub-action handler
/**
* MaybeTruncateInsertionStringForMaxLength() truncates aInsertionString to
* `maxlength` if it was not pasted in by the user.
*
* @param aInsertionString [in/out] New insertion string. This is
* truncated to `maxlength` if it was not pasted in
* by the user.
* @return If aInsertionString is truncated, it returns "as
* handled", else "as ignored."
*/
EditActionResult MaybeTruncateInsertionStringForMaxLength(
nsAString& aInsertionString);
/**
* InsertLineFeedCharacterAtSelection() inserts a linefeed character at
* selection.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT EditActionResult
InsertLineFeedCharacterAtSelection();
/**
* Handles the newline characters according to the default system prefs
* (editor.singleLine.pasteNewlines).
* Each value means:
* nsIEditor::eNewlinesReplaceWithSpaces (2, Firefox default):
* replace newlines with spaces.
* nsIEditor::eNewlinesStrip (3):
* remove newlines from the string.
* nsIEditor::eNewlinesReplaceWithCommas (4, Thunderbird default):
* replace newlines with commas.
* nsIEditor::eNewlinesStripSurroundingWhitespace (5):
* collapse newlines and surrounding white-space characters and
* remove them from the string.
* nsIEditor::eNewlinesPasteIntact (0):
* only remove the leading and trailing newlines.
* nsIEditor::eNewlinesPasteToFirst (1) or any other value:
* remove the first newline and all characters following it.
*
* @param aString the string to be modified in place.
*/
void HandleNewLinesInStringForSingleLineEditor(nsString& aString) const;
[[nodiscard]] MOZ_CAN_RUN_SCRIPT EditActionResult HandleInsertText(
EditSubAction aEditSubAction, const nsAString& aInsertionString) final;
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult InsertDroppedDataTransferAsAction(
AutoEditActionDataSetter& aEditActionData,
dom::DataTransfer& aDataTransfer, const EditorDOMPoint& aDroppedAt,
dom::Document* aSrcDocument) final;
/**
* HandleDeleteSelectionInternal() is a helper method of
* HandleDeleteSelection(). Must be called only when the instance is
* TextEditor.
* NOTE: This method creates SelectionBatcher. Therefore, each caller
* needs to check if the editor is still available even if this returns
* NS_OK.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT EditActionResult
HandleDeleteSelectionInternal(nsIEditor::EDirection aDirectionAndAmount,
nsIEditor::EStripWrappers aStripWrappers);
/**
* This method handles "delete selection" commands.
*
* @param aDirectionAndAmount Direction of the deletion.
* @param aStripWrappers Must be nsIEditor::eNoStrip.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT EditActionResult
HandleDeleteSelection(nsIEditor::EDirection aDirectionAndAmount,
nsIEditor::EStripWrappers aStripWrappers) final;
/**
* ComputeValueFromTextNodeAndBRElement() tries to compute "value" of
* this editor content only with text nodes and `<br>` elements.
* If this succeeds to compute the value, it's returned with aValue and
* the result is marked as "handled". Otherwise, the caller needs to
* compute it with another way.
*/
EditActionResult ComputeValueFromTextNodeAndBRElement(
nsAString& aValue) const;
/**
* SetTextWithoutTransaction() is optimized method to set `<input>.value`
* and `<textarea>.value` to aValue without transaction. This must be
* called only when it's not `HTMLEditor` and undo/redo is disabled.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT EditActionResult
SetTextWithoutTransaction(const nsAString& aValue);
/**
* EnsureCaretNotAtEndOfTextNode() collapses selection at the padding `<br>`
* element (i.e., container becomes the anonymous `<div>` element) if
* `Selection` is at end of the text node.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult EnsureCaretNotAtEndOfTextNode();
protected: // Called by helper classes.
MOZ_CAN_RUN_SCRIPT void OnStartToHandleTopLevelEditSubAction(
EditSubAction aTopLevelEditSubAction,
nsIEditor::EDirection aDirectionOfTopLevelEditSubAction,
ErrorResult& aRv) final;
MOZ_CAN_RUN_SCRIPT nsresult OnEndHandlingTopLevelEditSubAction() final;
/**
* HandleInlineSpellCheckAfterEdit() does spell-check after handling top level
* edit subaction.
*/
nsresult HandleInlineSpellCheckAfterEdit() {
MOZ_ASSERT(IsEditActionDataAvailable());
if (!GetSpellCheckRestartPoint().IsSet()) {
return NS_OK; // Maybe being initialized.
}
nsresult rv = HandleInlineSpellCheck(GetSpellCheckRestartPoint());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to spellcheck");
ClearSpellCheckRestartPoint();
return rv;
}
protected: // Shouldn't be used by friend classes
virtual ~TextEditor();
/**
* CanEchoPasswordNow() returns true if currently we can echo password.
* If it's direct user input such as pasting or dropping text, this
* returns false even if we may echo password.
*/
bool CanEchoPasswordNow() const;
/**
* Make the given selection span the entire document.
*/
MOZ_CAN_RUN_SCRIPT nsresult SelectEntireDocument() final;
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult
InsertWithQuotationsAsSubAction(const nsAString& aQuotedText) final;
[[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult
InsertTextFromTransferable(nsITransferable* transferable);
bool IsCopyToClipboardAllowedInternal() const final;
already_AddRefed<Element> GetInputEventTargetElement() const final;
/**
* See SetUnmaskRange() and SetUnmaskRangeAndNotify() for the detail.
*
* @param aForceStartMasking If true, forcibly starts masking. This should
* be used only when `nsIEditor::Mask()` is called.
*/
MOZ_CAN_RUN_SCRIPT nsresult SetUnmaskRangeInternal(uint32_t aStart,
uint32_t aLength,
uint32_t aTimeout,
bool aNotify,
bool aForceStartMasking);
MOZ_ALWAYS_INLINE bool HasAutoMaskingTimer() const {
return mPasswordMaskData && mPasswordMaskData->mTimer;
}
protected:
UniquePtr<PasswordMaskData> mPasswordMaskData;
int32_t mMaxTextLength = -1;
friend class DeleteNodeTransaction;
friend class EditorBase;
friend class InsertNodeTransaction;
};
} // namespace mozilla
mozilla::TextEditor* nsIEditor::AsTextEditor() {
MOZ_DIAGNOSTIC_ASSERT(IsTextEditor());
return static_cast<mozilla::TextEditor*>(this);
}
const mozilla::TextEditor* nsIEditor::AsTextEditor() const {
MOZ_DIAGNOSTIC_ASSERT(IsTextEditor());
return static_cast<const mozilla::TextEditor*>(this);
}
mozilla::TextEditor* nsIEditor::GetAsTextEditor() {
return AsEditorBase()->IsTextEditor() ? AsTextEditor() : nullptr;
}
const mozilla::TextEditor* nsIEditor::GetAsTextEditor() const {
return AsEditorBase()->IsTextEditor() ? AsTextEditor() : nullptr;
}
#endif // #ifndef mozilla_TextEditor_h
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