Bug 1849122, allowing getting and modifying the autofill state directly within the input and select elements, and reset this state when its value changes, r=webidl,emilio

Resetting the state when the value is modified is bug 1359355.

Differential Revision: https://phabricator.services.mozilla.com/D210999

dom/html/HTMLInputElement.cpp

@@ -6975,6 +6975,10 @@ void HTMLInputElement::OnValueChanged(ValueChangeKind aKind,
   MOZ_ASSERT_IF(aKnownNewValue, aKnownNewValue->IsEmpty() == aNewValueEmpty);
   if (aKind != ValueChangeKind::Internal) {
     mLastValueChangeWasInteractive = aKind == ValueChangeKind::UserInteraction;
+
+    if (State().HasState(ElementState::AUTOFILL)) {
+      RemoveStates(ElementState::AUTOFILL | ElementState::AUTOFILL_PREVIEW);
+    }
   }
 
   if (aNewValueEmpty != IsValueEmpty()) {

dom/html/HTMLInputElement.h

@@ -248,6 +248,12 @@ class HTMLInputElement final : public TextControlElement,
   MOZ_CAN_RUN_SCRIPT nsresult CreateEditor() override;
   void SetPreviewValue(const nsAString& aValue) override;
   void GetPreviewValue(nsAString& aValue) override;
+  void SetAutofillState(const nsAString& aState) override {
+    SetFormAutofillState(aState);
+  }
+  void GetAutofillState(nsAString& aState) override {
+    GetFormAutofillState(aState);
+  }
   void EnablePreview() override;
   bool IsPreviewEnabled() override;
   void InitializeKeyboardEventListeners() override;

dom/html/HTMLSelectElement.cpp

@@ -1595,6 +1595,11 @@ void HTMLSelectElement::OnSelectionChanged() {
   if (!mDefaultSelectionSet) {
     return;
   }
+
+  if (State().HasState(ElementState::AUTOFILL)) {
+    RemoveStates(ElementState::AUTOFILL | ElementState::AUTOFILL_PREVIEW);
+  }
+
   UpdateSelectedOptions();
 }
 

dom/html/HTMLSelectElement.h

@@ -327,6 +327,11 @@ class HTMLSelectElement final : public nsGenericHTMLFormControlElementWithState,
   void GetPreviewValue(nsAString& aValue) { aValue = mPreviewValue; }
   void SetPreviewValue(const nsAString& aValue);
 
+  void SetAutofillState(const nsAString& aState) {
+    SetFormAutofillState(aState);
+  }
+  void GetAutofillState(nsAString& aState) { GetFormAutofillState(aState); }
+
  protected:
   virtual ~HTMLSelectElement() = default;
 

dom/html/HTMLTextAreaElement.h

@@ -95,6 +95,12 @@ class HTMLTextAreaElement final : public TextControlElement,
   MOZ_CAN_RUN_SCRIPT nsresult CreateEditor() override;
   void SetPreviewValue(const nsAString& aValue) override;
   void GetPreviewValue(nsAString& aValue) override;
+  void SetAutofillState(const nsAString& aState) override {
+    SetFormAutofillState(aState);
+  }
+  void GetAutofillState(nsAString& aState) override {
+    GetFormAutofillState(aState);
+  }
   void EnablePreview() override;
   bool IsPreviewEnabled() override;
   void InitializeKeyboardEventListeners() override;

dom/html/TextControlElement.h

@@ -165,6 +165,16 @@ class TextControlElement : public nsGenericHTMLFormControlElementWithState {
    */
   virtual void GetPreviewValue(nsAString& aValue) = 0;
 
+  /**
+   * Enable preview or autofilled state for the text control.
+   */
+  virtual void SetAutofillState(const nsAString& aState) = 0;
+
+  /**
+   * Get the current preview or autofilled state for the text control.
+   */
+  virtual void GetAutofillState(nsAString& aState) = 0;
+
   /**
    * Enable preview for text control.
    */

dom/html/nsGenericHTMLElement.cpp

@@ -2804,6 +2804,29 @@ nsresult nsGenericHTMLFormControlElement::SubmitDirnameDir(
   return NS_OK;
 }
 
+void nsGenericHTMLFormControlElement::GetFormAutofillState(
+    nsAString& aState) const {
+  if (State().HasState(ElementState::AUTOFILL_PREVIEW)) {
+    aState.AssignLiteral("preview");
+  } else if (State().HasState(ElementState::AUTOFILL)) {
+    aState.AssignLiteral("autofill");
+  } else {
+    aState.Truncate();
+  }
+}
+
+void nsGenericHTMLFormControlElement::SetFormAutofillState(
+    const nsAString& aState) {
+  if (aState.EqualsLiteral("autofill")) {
+    RemoveStates(ElementState::AUTOFILL_PREVIEW);
+    AddStates(ElementState::AUTOFILL);
+  } else if (aState.EqualsLiteral("preview")) {
+    AddStates(ElementState::AUTOFILL | ElementState::AUTOFILL_PREVIEW);
+  } else {
+    RemoveStates(ElementState::AUTOFILL | ElementState::AUTOFILL_PREVIEW);
+  }
+}
+
 //----------------------------------------------------------------------
 
 static const nsAttrValue::EnumTable kPopoverTargetActionTable[] = {

dom/html/nsGenericHTMLElement.h

@@ -1225,6 +1225,9 @@ class nsGenericHTMLFormControlElement : public nsGenericHTMLFormElement,
 
   nsresult SubmitDirnameDir(mozilla::dom::FormData* aFormData);
 
+  void GetFormAutofillState(nsAString& aState) const;
+  void SetFormAutofillState(const nsAString& aState);
+
   /** The form that contains this control */
   mozilla::dom::HTMLFormElement* mForm;
 

dom/webidl/HTMLInputElement.webidl

@@ -191,6 +191,11 @@ partial interface HTMLInputElement {
   [ChromeOnly]
   attribute DOMString previewValue;
 
+  // A string indicating that the value of the element has been autofilled:
+  // either "filled", "preview" or "".
+  [ChromeOnly]
+  attribute DOMString autofillState;
+
   // Last value entered by the user, not by a script.
   // NOTE(emilio): As of right now some execCommand triggered changes might be
   // considered interactive.

dom/webidl/HTMLSelectElement.webidl

@@ -79,4 +79,8 @@ partial interface HTMLSelectElement {
   AutocompleteInfo getAutocompleteInfo();
   [ChromeOnly]
   attribute DOMString previewValue;
+  // A string indicating that the value of the element has been autofilled:
+  // either "filled", "preview" or "".
+  [ChromeOnly]
+  attribute DOMString autofillState;
 };