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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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_TextControlState_h
+#define mozilla_TextControlState_h
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/EnumSet.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/TextControlElement.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WeakPtr.h"
+#include "mozilla/dom/HTMLInputElementBinding.h"
+#include "mozilla/dom/Nullable.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsITextControlFrame.h"
+#include "nsITimer.h"
+
+class nsTextControlFrame;
+class nsISelectionController;
+class nsFrameSelection;
+class nsFrame;
+
+namespace mozilla {
+
+class AutoTextControlHandlingState;
+class ErrorResult;
+class IMEContentObserver;
+class TextEditor;
+class TextInputListener;
+class TextInputSelectionController;
+
+namespace dom {
+class Element;
+class HTMLInputElement;
+} // namespace dom
+
+/**
+ * PasswordMaskData stores making information and necessary timer for
+ * `TextEditor` instances.
+ */
+struct PasswordMaskData final {
+ // Timer to mask unmasked characters automatically. Used only when it's
+ // a password field.
+ nsCOMPtr<nsITimer> mTimer;
+
+ // Unmasked character range. Used only when it's a password field.
+ // If mUnmaskedLength is 0, it means there is no unmasked characters.
+ uint32_t mUnmaskedStart = UINT32_MAX;
+ uint32_t mUnmaskedLength = 0;
+
+ // Set to true if all characters are masked or waiting notification from
+ // `mTimer`. Otherwise, i.e., part of or all of password is unmasked
+ // without setting `mTimer`, set to false.
+ bool mIsMaskingPassword = true;
+
+ // Set to true if a manager of the instance wants to disable echoing
+ // password temporarily.
+ bool mEchoingPasswordPrevented = false;
+
+ MOZ_ALWAYS_INLINE bool IsAllMasked() const {
+ return mUnmaskedStart == UINT32_MAX && mUnmaskedLength == 0;
+ }
+ MOZ_ALWAYS_INLINE uint32_t UnmaskedEnd() const {
+ return mUnmaskedStart + mUnmaskedLength;
+ }
+ MOZ_ALWAYS_INLINE void MaskAll() {
+ mUnmaskedStart = UINT32_MAX;
+ mUnmaskedLength = 0;
+ }
+ MOZ_ALWAYS_INLINE void Reset() {
+ MaskAll();
+ mIsMaskingPassword = true;
+ }
+ enum class ReleaseTimer { No, Yes };
+ MOZ_ALWAYS_INLINE void CancelTimer(ReleaseTimer aReleaseTimer) {
+ if (mTimer) {
+ mTimer->Cancel();
+ if (aReleaseTimer == ReleaseTimer::Yes) {
+ mTimer = nullptr;
+ }
+ }
+ if (mIsMaskingPassword) {
+ MaskAll();
+ }
+ }
+};
+
+/**
+ * TextControlState is a class which is responsible for managing the state of
+ * plaintext controls. This currently includes the following HTML elements:
+ * <input type=text>
+ * <input type=search>
+ * <input type=url>
+ * <input type=telephone>
+ * <input type=email>
+ * <input type=password>
+ * <textarea>
+ *
+ * This class is held as a member of HTMLInputElement and HTMLTextAreaElement.
+ * The public functions in this class include the public APIs which dom/
+ * uses. Layout code uses the TextControlElement interface to invoke
+ * functions on this class.
+ *
+ * The design motivation behind this class is maintaining all of the things
+ * which collectively are considered the "state" of the text control in a single
+ * location. This state includes several things:
+ *
+ * * The control's value. This value is stored in the mValue member, and is
+ * only used when there is no frame for the control, or when the editor object
+ * has not been initialized yet.
+ *
+ * * The control's associated frame. This value is stored in the mBoundFrame
+ * member. A text control might never have an associated frame during its life
+ * cycle, or might have several different ones, but at any given moment in time
+ * there is a maximum of 1 bound frame to each text control.
+ *
+ * * The control's associated editor. This value is stored in the mTextEditor
+ * member. An editor is initialized for the control only when necessary (that
+ * is, when either the user is about to interact with the text control, or when
+ * some other code needs to access the editor object. Without a frame bound to
+ * the control, an editor is never initialized. Once initialized, the editor
+ * might outlive the frame, in which case the same editor will be used if a new
+ * frame gets bound to the text control.
+ *
+ * * The anonymous content associated with the text control's frame, including
+ * the value div (the DIV element responsible for holding the value of the text
+ * control) and the placeholder div (the DIV element responsible for holding the
+ * placeholder value of the text control.) These values are stored in the
+ * mRootNode and mPlaceholderDiv members, respectively. They will be created
+ * when a frame is bound to the text control. They will be destroyed when the
+ * frame is unbound from the object. We could try and hold on to the anonymous
+ * content between different frames, but unfortunately that is not currently
+ * possible because they are not unbound from the document in time.
+ *
+ * * The frame selection controller. This value is stored in the mSelCon
+ * member. The frame selection controller is responsible for maintaining the
+ * selection state on a frame. It is created when a frame is bound to the text
+ * control element, and will be destroy when the frame is being unbound from the
+ * text control element. It is created alongside with the frame selection object
+ * which is stored in the mFrameSel member.
+ *
+ * * The editor text listener. This value is stored in the mTextListener
+ * member. Its job is to listen to selection and keyboard events, and act
+ * accordingly. It is created when an a frame is first bound to the control, and
+ * will be destroyed when the frame is unbound from the text control element.
+ *
+ * * The editor's cached value. This value is stored in the mCachedValue
+ * member. It is used to improve the performance of append operations to the
+ * text control. A mutation observer stored in the mMutationObserver has the
+ * job of invalidating this cache when the anonymous contect containing the
+ * value is changed.
+ *
+ * * The editor's cached selection properties. These vales are stored in the
+ * mSelectionProperties member, and include the selection's start, end and
+ * direction. They are only used when there is no frame available for the
+ * text field.
+ *
+ *
+ * As a general rule, TextControlState objects own the value of the text
+ * control, and any attempt to retrieve or set the value must be made through
+ * those objects. Internally, the value can be represented in several different
+ * ways, based on the state the control is in.
+ *
+ * * When the control is first initialized, its value is equal to the default
+ * value of the DOM node. For <input> text controls, this default value is the
+ * value of the value attribute. For <textarea> elements, this default value is
+ * the value of the text node children of the element.
+ *
+ * * If the value has been changed through the DOM node (before the editor for
+ * the object is initialized), the value is stored as a simple string inside the
+ * mValue member of the TextControlState object.
+ *
+ * * If an editor has been initialized for the control, the value is set and
+ * retrievd via the nsIEditor interface, and is internally managed by the
+ * editor as the native anonymous content tree attached to the control's frame.
+ *
+ * * If the text control state object is unbound from the control's frame, the
+ * value is transferred to the mValue member variable, and will be managed there
+ * until a new frame is bound to the text editor state object.
+ */
+
+class RestoreSelectionState;
+
+class TextControlState final : public SupportsWeakPtr {
+ public:
+ using Element = dom::Element;
+ using HTMLInputElement = dom::HTMLInputElement;
+ using SelectionDirection = nsITextControlFrame::SelectionDirection;
+
+ static TextControlState* Construct(TextControlElement* aOwningElement);
+
+ // Note that this does not run script actually because of `sHasShutDown`
+ // is set to true before calling `DeleteOrCacheForReuse()`.
+ MOZ_CAN_RUN_SCRIPT_BOUNDARY static void Shutdown();
+
+ /**
+ * Destroy() deletes the instance immediately or later.
+ */
+ MOZ_CAN_RUN_SCRIPT void Destroy();
+
+ TextControlState() = delete;
+ explicit TextControlState(const TextControlState&) = delete;
+ TextControlState(TextControlState&&) = delete;
+
+ void operator=(const TextControlState&) = delete;
+ void operator=(TextControlState&&) = delete;
+
+ void Traverse(nsCycleCollectionTraversalCallback& cb);
+ MOZ_CAN_RUN_SCRIPT_BOUNDARY void Unlink();
+
+ bool IsBusy() const { return !!mHandlingState || mValueTransferInProgress; }
+
+ MOZ_CAN_RUN_SCRIPT TextEditor* GetTextEditor();
+ TextEditor* GetTextEditorWithoutCreation() const;
+ nsISelectionController* GetSelectionController() const;
+ nsFrameSelection* GetConstFrameSelection();
+ nsresult BindToFrame(nsTextControlFrame* aFrame);
+ MOZ_CAN_RUN_SCRIPT void UnbindFromFrame(nsTextControlFrame* aFrame);
+ MOZ_CAN_RUN_SCRIPT nsresult PrepareEditor(const nsAString* aValue = nullptr);
+ void InitializeKeyboardEventListeners();
+
+ /**
+ * OnEditActionHandled() is called when mTextEditor handles something
+ * and immediately before dispatching "input" event.
+ */
+ [[nodiscard]] MOZ_CAN_RUN_SCRIPT nsresult OnEditActionHandled();
+
+ enum class ValueSetterOption {
+ // The call is for setting value to initial one, computed one, etc.
+ ByInternalAPI,
+ // The value is changed by a call of setUserInput() API from chrome.
+ BySetUserInputAPI,
+ // The value is changed by changing value attribute of the element or
+ // something like setRangeText().
+ ByContentAPI,
+ // The value is changed by setRangeText(). Intended to prevent silent
+ // selection range change.
+ BySetRangeTextAPI,
+ // Whether SetValueChanged should be called as a result of this value
+ // change.
+ SetValueChanged,
+ // Whether to move the cursor to end of the value (in the case when we have
+ // cached selection offsets), in the case when the value has changed. If
+ // this is not set and MoveCursorToBeginSetSelectionDirectionForward
+ // is not set, the cached selection offsets will simply be clamped to
+ // be within the length of the new value. In either case, if the value has
+ // not changed the cursor won't move.
+ // TODO(mbrodesser): update comment and enumerator identifier to reflect
+ // that also the direction is set to forward.
+ MoveCursorToEndIfValueChanged,
+
+ // The value change should preserve undo history.
+ PreserveUndoHistory,
+
+ // Whether it should be tried to move the cursor to the beginning of the
+ // text control and set the selection direction to "forward".
+ // TODO(mbrodesser): As soon as "none" is supported
+ // (https://bugzilla.mozilla.org/show_bug.cgi?id=1541454), it should be set
+ // to "none" and only fall back to "forward" if the platform doesn't support
+ // it.
+ MoveCursorToBeginSetSelectionDirectionForward,
+ };
+ using ValueSetterOptions = EnumSet<ValueSetterOption, uint32_t>;
+
+ /**
+ * SetValue() sets the value to aValue with replacing \r\n and \r with \n.
+ *
+ * @param aValue The new value. Can contain \r.
+ * @param aOldValue Optional. If you have already know current value,
+ * set this to it. However, this must not contain \r
+ * for the performance.
+ * @param aOptions See ValueSetterOption.
+ */
+ [[nodiscard]] MOZ_CAN_RUN_SCRIPT bool SetValue(
+ const nsAString& aValue, const nsAString* aOldValue,
+ const ValueSetterOptions& aOptions);
+ [[nodiscard]] MOZ_CAN_RUN_SCRIPT bool SetValue(
+ const nsAString& aValue, const ValueSetterOptions& aOptions) {
+ return SetValue(aValue, nullptr, aOptions);
+ }
+
+ /**
+ * GetValue() returns current value either with or without TextEditor.
+ * The result never includes \r.
+ */
+ void GetValue(nsAString& aValue, bool aIgnoreWrap, bool aForDisplay) const;
+
+ /**
+ * ValueEquals() is designed for internal use so that aValue shouldn't
+ * include \r character. It should be handled before calling this with
+ * nsContentUtils::PlatformToDOMLineBreaks().
+ */
+ bool ValueEquals(const nsAString& aValue) const;
+ // The following methods are for textarea element to use whether default
+ // value or not.
+ // XXX We might have to add assertion when it is into editable,
+ // or reconsider fixing bug 597525 to remove these.
+ void EmptyValue() {
+ if (!mValue.IsVoid()) {
+ mValue.Truncate();
+ }
+ }
+ bool IsEmpty() const { return mValue.IsEmpty(); }
+
+ const nsAString& LastInteractiveValueIfLastChangeWasNonInteractive() const {
+ return mLastInteractiveValue;
+ }
+ // When an interactive value change happens, we clear mLastInteractiveValue
+ // because it's not needed (mValue is the new interactive value).
+ void ClearLastInteractiveValue() { mLastInteractiveValue.SetIsVoid(true); }
+
+ Element* GetRootNode();
+ Element* GetPreviewNode();
+
+ bool IsSingleLineTextControl() const {
+ return mTextCtrlElement->IsSingleLineTextControl();
+ }
+ bool IsTextArea() const { return mTextCtrlElement->IsTextArea(); }
+ bool IsPasswordTextControl() const {
+ return mTextCtrlElement->IsPasswordTextControl();
+ }
+ int32_t GetCols() { return mTextCtrlElement->GetCols(); }
+ int32_t GetWrapCols() {
+ int32_t wrapCols = mTextCtrlElement->GetWrapCols();
+ MOZ_ASSERT(wrapCols >= 0);
+ return wrapCols;
+ }
+ int32_t GetRows() { return mTextCtrlElement->GetRows(); }
+
+ // preview methods
+ void SetPreviewText(const nsAString& aValue, bool aNotify);
+ void GetPreviewText(nsAString& aValue);
+
+ struct SelectionProperties {
+ public:
+ bool IsDefault() const {
+ return mStart == 0 && mEnd == 0 &&
+ mDirection == SelectionDirection::Forward;
+ }
+ uint32_t GetStart() const { return mStart; }
+ bool SetStart(uint32_t value) {
+ uint32_t newValue = std::min(value, *mMaxLength);
+ bool changed = mStart != newValue;
+ mStart = newValue;
+ mIsDirty |= changed;
+ return changed;
+ }
+ uint32_t GetEnd() const { return mEnd; }
+ bool SetEnd(uint32_t value) {
+ uint32_t newValue = std::min(value, *mMaxLength);
+ bool changed = mEnd != newValue;
+ mEnd = newValue;
+ mIsDirty |= changed;
+ return changed;
+ }
+ SelectionDirection GetDirection() const { return mDirection; }
+ bool SetDirection(SelectionDirection value) {
+ bool changed = mDirection != value;
+ mDirection = value;
+ mIsDirty |= changed;
+ return changed;
+ }
+ void SetMaxLength(uint32_t aMax) {
+ mMaxLength = Some(aMax);
+ // recompute against the new max length
+ SetStart(GetStart());
+ SetEnd(GetEnd());
+ }
+ bool HasMaxLength() { return mMaxLength.isSome(); }
+
+ // return true only if mStart, mEnd, or mDirection have been modified,
+ // or if SetIsDirty() was explicitly called.
+ bool IsDirty() const { return mIsDirty; }
+ void SetIsDirty() { mIsDirty = true; }
+
+ private:
+ uint32_t mStart = 0;
+ uint32_t mEnd = 0;
+ Maybe<uint32_t> mMaxLength;
+ bool mIsDirty = false;
+ SelectionDirection mDirection = SelectionDirection::Forward;
+ };
+
+ bool IsSelectionCached() const { return mSelectionCached; }
+ SelectionProperties& GetSelectionProperties() { return mSelectionProperties; }
+ MOZ_CAN_RUN_SCRIPT void SetSelectionProperties(SelectionProperties& aProps);
+ bool HasNeverInitializedBefore() const { return !mEverInited; }
+ // Sync up our selection properties with our editor prior to being destroyed.
+ // This will invoke UnbindFromFrame() to ensure that we grab whatever
+ // selection state may be at the moment.
+ MOZ_CAN_RUN_SCRIPT void SyncUpSelectionPropertiesBeforeDestruction();
+
+ // Get the selection range start and end points in our text.
+ void GetSelectionRange(uint32_t* aSelectionStart, uint32_t* aSelectionEnd,
+ ErrorResult& aRv);
+
+ // Get the selection direction
+ nsITextControlFrame::SelectionDirection GetSelectionDirection(
+ ErrorResult& aRv);
+
+ enum class ScrollAfterSelection { No, Yes };
+
+ // Set the selection range (start, end, direction). aEnd is allowed to be
+ // smaller than aStart; in that case aStart will be reset to the same value as
+ // aEnd. This basically implements
+ // https://html.spec.whatwg.org/multipage/forms.html#set-the-selection-range
+ // but with the start/end already coerced to zero if null (and without the
+ // special infinity value), and the direction already converted to a
+ // SelectionDirection.
+ //
+ // If we have a frame, this method will scroll the selection into view.
+ MOZ_CAN_RUN_SCRIPT void SetSelectionRange(
+ uint32_t aStart, uint32_t aEnd,
+ nsITextControlFrame::SelectionDirection aDirection, ErrorResult& aRv,
+ ScrollAfterSelection aScroll = ScrollAfterSelection::Yes);
+
+ // Set the selection range, but with an optional string for the direction.
+ // This will convert aDirection to an nsITextControlFrame::SelectionDirection
+ // and then call our other SetSelectionRange overload.
+ MOZ_CAN_RUN_SCRIPT void SetSelectionRange(
+ uint32_t aSelectionStart, uint32_t aSelectionEnd,
+ const dom::Optional<nsAString>& aDirection, ErrorResult& aRv,
+ ScrollAfterSelection aScroll = ScrollAfterSelection::Yes);
+
+ // Set the selection start. This basically implements the
+ // https://html.spec.whatwg.org/multipage/forms.html#dom-textarea/input-selectionstart
+ // setter.
+ MOZ_CAN_RUN_SCRIPT void SetSelectionStart(
+ const dom::Nullable<uint32_t>& aStart, ErrorResult& aRv);
+
+ // Set the selection end. This basically implements the
+ // https://html.spec.whatwg.org/multipage/forms.html#dom-textarea/input-selectionend
+ // setter.
+ MOZ_CAN_RUN_SCRIPT void SetSelectionEnd(const dom::Nullable<uint32_t>& aEnd,
+ ErrorResult& aRv);
+
+ // Get the selection direction as a string. This implements the
+ // https://html.spec.whatwg.org/multipage/forms.html#dom-textarea/input-selectiondirection
+ // getter.
+ void GetSelectionDirectionString(nsAString& aDirection, ErrorResult& aRv);
+
+ // Set the selection direction. This basically implements the
+ // https://html.spec.whatwg.org/multipage/forms.html#dom-textarea/input-selectiondirection
+ // setter.
+ MOZ_CAN_RUN_SCRIPT void SetSelectionDirection(const nsAString& aDirection,
+ ErrorResult& aRv);
+
+ // Set the range text. This basically implements
+ // https://html.spec.whatwg.org/multipage/forms.html#dom-textarea/input-setrangetext
+ MOZ_CAN_RUN_SCRIPT void SetRangeText(const nsAString& aReplacement,
+ ErrorResult& aRv);
+ // The last two arguments are -1 if we don't know our selection range;
+ // otherwise they're the start and end of our selection range.
+ MOZ_CAN_RUN_SCRIPT void SetRangeText(
+ const nsAString& aReplacement, uint32_t aStart, uint32_t aEnd,
+ dom::SelectionMode aSelectMode, ErrorResult& aRv,
+ const Maybe<uint32_t>& aSelectionStart = Nothing(),
+ const Maybe<uint32_t>& aSelectionEnd = Nothing());
+
+ private:
+ explicit TextControlState(TextControlElement* aOwningElement);
+ MOZ_CAN_RUN_SCRIPT ~TextControlState();
+
+ /**
+ * Delete the instance or cache to reuse it if possible.
+ */
+ MOZ_CAN_RUN_SCRIPT void DeleteOrCacheForReuse();
+
+ MOZ_CAN_RUN_SCRIPT void UnlinkInternal();
+
+ MOZ_CAN_RUN_SCRIPT void DestroyEditor();
+ MOZ_CAN_RUN_SCRIPT void Clear();
+
+ nsresult InitializeRootNode();
+
+ void FinishedRestoringSelection();
+
+ bool EditorHasComposition();
+
+ /**
+ * SetValueWithTextEditor() modifies the editor value with mTextEditor.
+ * This may cause destroying mTextEditor, mBoundFrame, the TextControlState
+ * itself. Must be called when both mTextEditor and mBoundFrame are not
+ * nullptr.
+ *
+ * @param aHandlingSetValue Must be inner-most handling state for SetValue.
+ * @return false if fallible allocation failed. Otherwise,
+ * true.
+ */
+ MOZ_CAN_RUN_SCRIPT bool SetValueWithTextEditor(
+ AutoTextControlHandlingState& aHandlingSetValue);
+
+ /**
+ * SetValueWithoutTextEditor() modifies the value without editor. I.e.,
+ * modifying the value in this instance and mBoundFrame. Must be called
+ * when at least mTextEditor or mBoundFrame is nullptr.
+ *
+ * @param aHandlingSetValue Must be inner-most handling state for SetValue.
+ * @return false if fallible allocation failed. Otherwise,
+ * true.
+ */
+ MOZ_CAN_RUN_SCRIPT bool SetValueWithoutTextEditor(
+ AutoTextControlHandlingState& aHandlingSetValue);
+
+ IMEContentObserver* GetIMEContentObserver() const;
+
+ // When this class handles something which may run script, this should be
+ // set to non-nullptr. If so, this class claims that it's busy and that
+ // prevents destroying TextControlState instance.
+ AutoTextControlHandlingState* mHandlingState = nullptr;
+
+ // The text control element owns this object, and ensures that this object
+ // has a smaller lifetime except the owner releases the instance while it
+ // does something with this.
+ TextControlElement* MOZ_NON_OWNING_REF mTextCtrlElement;
+ RefPtr<TextInputSelectionController> mSelCon;
+ RefPtr<RestoreSelectionState> mRestoringSelection;
+ RefPtr<TextEditor> mTextEditor;
+ nsTextControlFrame* mBoundFrame = nullptr;
+ RefPtr<TextInputListener> mTextListener;
+ UniquePtr<PasswordMaskData> mPasswordMaskData;
+
+ nsString mValue{VoidString()}; // Void if there's no value.
+
+ // If our input's last value change was not interactive (as in, the value
+ // change was caused by a ValueChangeKind::UserInteraction), this is the value
+ // that the last interaction had.
+ nsString mLastInteractiveValue{VoidString()};
+
+ SelectionProperties mSelectionProperties;
+
+ bool mEverInited : 1; // Have we ever been initialized?
+ bool mEditorInitialized : 1;
+ bool mValueTransferInProgress : 1; // Whether a value is being transferred to
+ // the frame
+ bool mSelectionCached : 1; // Whether mSelectionProperties is valid
+
+ friend class AutoTextControlHandlingState;
+ friend class PrepareEditorEvent;
+ friend class RestoreSelectionState;
+};
+
+} // namespace mozilla
+
+#endif // #ifndef mozilla_TextControlState_h
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