1 files changed, 438 insertions, 0 deletions
diff --git a/dom/html/HTMLButtonElement.cpp b/dom/html/HTMLButtonElement.cpp
new file mode 100644
index 0000000000..7aa7428a26
--- /dev/null
+++ b/dom/html/HTMLButtonElement.cpp
@@ -0,0 +1,438 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/HTMLButtonElement.h"
+
+#include "HTMLFormSubmissionConstants.h"
+#include "mozilla/dom/FormData.h"
+#include "mozilla/dom/HTMLButtonElementBinding.h"
+#include "nsAttrValueInlines.h"
+#include "nsIContentInlines.h"
+#include "nsGkAtoms.h"
+#include "nsStyleConsts.h"
+#include "nsPresContext.h"
+#include "nsIFormControl.h"
+#include "nsIFrame.h"
+#include "nsIFormControlFrame.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/ContentEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/TextEvents.h"
+#include "nsUnicharUtils.h"
+#include "nsLayoutUtils.h"
+#include "mozilla/PresState.h"
+#include "nsError.h"
+#include "nsFocusManager.h"
+#include "mozilla/dom/HTMLFormElement.h"
+#include "mozAutoDocUpdate.h"
+
+#define NS_IN_SUBMIT_CLICK (1 << 0)
+#define NS_OUTER_ACTIVATE_EVENT (1 << 1)
+
+NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(Button)
+
+namespace mozilla::dom {
+
+static const nsAttrValue::EnumTable kButtonTypeTable[] = {
+    {"button", FormControlType::ButtonButton},
+    {"reset", FormControlType::ButtonReset},
+    {"submit", FormControlType::ButtonSubmit},
+    {nullptr, 0}};
+
+// Default type is 'submit'.
+static const nsAttrValue::EnumTable* kButtonDefaultType = &kButtonTypeTable[2];
+
+// Construction, destruction
+HTMLButtonElement::HTMLButtonElement(
+    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+    FromParser aFromParser)
+    : nsGenericHTMLFormControlElementWithState(
+          std::move(aNodeInfo), aFromParser,
+          FormControlType(kButtonDefaultType->value)),
+      mDisabledChanged(false),
+      mInInternalActivate(false),
+      mInhibitStateRestoration(aFromParser & FROM_PARSER_FRAGMENT) {
+  // Set up our default state: enabled
+  AddStatesSilently(ElementState::ENABLED);
+}
+
+HTMLButtonElement::~HTMLButtonElement() = default;
+
+// nsISupports
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLButtonElement,
+                                   nsGenericHTMLFormControlElementWithState,
+                                   mValidity)
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(
+    HTMLButtonElement, nsGenericHTMLFormControlElementWithState,
+    nsIConstraintValidation)
+
+void HTMLButtonElement::SetCustomValidity(const nsAString& aError) {
+  ConstraintValidation::SetCustomValidity(aError);
+  UpdateValidityElementStates(true);
+}
+
+void HTMLButtonElement::UpdateBarredFromConstraintValidation() {
+  SetBarredFromConstraintValidation(
+      mType == FormControlType::ButtonButton ||
+      mType == FormControlType::ButtonReset ||
+      HasFlag(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR) || IsDisabled());
+}
+
+void HTMLButtonElement::FieldSetDisabledChanged(bool aNotify) {
+  // FieldSetDisabledChanged *has* to be called *before*
+  // UpdateBarredFromConstraintValidation, because the latter depends on our
+  // disabled state.
+  nsGenericHTMLFormControlElementWithState::FieldSetDisabledChanged(aNotify);
+
+  UpdateBarredFromConstraintValidation();
+  UpdateValidityElementStates(aNotify);
+}
+
+NS_IMPL_ELEMENT_CLONE(HTMLButtonElement)
+
+void HTMLButtonElement::GetFormEnctype(nsAString& aFormEncType) {
+  GetEnumAttr(nsGkAtoms::formenctype, "", kFormDefaultEnctype->tag,
+              aFormEncType);
+}
+
+void HTMLButtonElement::GetFormMethod(nsAString& aFormMethod) {
+  GetEnumAttr(nsGkAtoms::formmethod, "", kFormDefaultMethod->tag, aFormMethod);
+}
+
+void HTMLButtonElement::GetType(nsAString& aType) {
+  GetEnumAttr(nsGkAtoms::type, kButtonDefaultType->tag, aType);
+}
+
+int32_t HTMLButtonElement::TabIndexDefault() { return 0; }
+
+bool HTMLButtonElement::IsHTMLFocusable(bool aWithMouse, bool* aIsFocusable,
+                                        int32_t* aTabIndex) {
+  if (nsGenericHTMLFormControlElementWithState::IsHTMLFocusable(
+          aWithMouse, aIsFocusable, aTabIndex)) {
+    return true;
+  }
+
+  *aIsFocusable = IsFormControlDefaultFocusable(aWithMouse) && !IsDisabled();
+
+  return false;
+}
+
+bool HTMLButtonElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+                                       const nsAString& aValue,
+                                       nsIPrincipal* aMaybeScriptedPrincipal,
+                                       nsAttrValue& aResult) {
+  if (aNamespaceID == kNameSpaceID_None) {
+    if (aAttribute == nsGkAtoms::type) {
+      return aResult.ParseEnumValue(aValue, kButtonTypeTable, false,
+                                    kButtonDefaultType);
+    }
+
+    if (aAttribute == nsGkAtoms::formmethod) {
+      return aResult.ParseEnumValue(aValue, kFormMethodTable, false);
+    }
+    if (aAttribute == nsGkAtoms::formenctype) {
+      return aResult.ParseEnumValue(aValue, kFormEnctypeTable, false);
+    }
+  }
+
+  return nsGenericHTMLFormControlElementWithState::ParseAttribute(
+      aNamespaceID, aAttribute, aValue, aMaybeScriptedPrincipal, aResult);
+}
+
+bool HTMLButtonElement::IsDisabledForEvents(WidgetEvent* aEvent) {
+  nsIFormControlFrame* formControlFrame = GetFormControlFrame(false);
+  nsIFrame* formFrame = do_QueryFrame(formControlFrame);
+  return IsElementDisabledForEvents(aEvent, formFrame);
+}
+
+void HTMLButtonElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
+  aVisitor.mCanHandle = false;
+
+  if (IsDisabledForEvents(aVisitor.mEvent)) {
+    return;
+  }
+
+  // Track whether we're in the outermost Dispatch invocation that will
+  // cause activation of the input.  That is, if we're a click event, or a
+  // DOMActivate that was dispatched directly, this will be set, but if we're
+  // a DOMActivate dispatched from click handling, it will not be set.
+  WidgetMouseEvent* mouseEvent = aVisitor.mEvent->AsMouseEvent();
+  bool outerActivateEvent =
+      ((mouseEvent && mouseEvent->IsLeftClickEvent()) ||
+       (aVisitor.mEvent->mMessage == eLegacyDOMActivate &&
+        !mInInternalActivate && aVisitor.mEvent->mOriginalTarget == this));
+
+  if (outerActivateEvent) {
+    aVisitor.mItemFlags |= NS_OUTER_ACTIVATE_EVENT;
+    aVisitor.mWantsActivationBehavior = true;
+  }
+
+  nsGenericHTMLElement::GetEventTargetParent(aVisitor);
+}
+
+void HTMLButtonElement::LegacyPreActivationBehavior(
+    EventChainVisitor& aVisitor) {
+  // out-of-spec legacy pre-activation behavior needed because of bug 1803805
+  if (mType == FormControlType::ButtonSubmit && mForm) {
+    aVisitor.mItemFlags |= NS_IN_SUBMIT_CLICK;
+    aVisitor.mItemData = static_cast<Element*>(mForm);
+    // tell the form that we are about to enter a click handler.
+    // that means that if there are scripted submissions, the
+    // latest one will be deferred until after the exit point of the handler.
+    mForm->OnSubmitClickBegin(this);
+  }
+}
+
+nsresult HTMLButtonElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
+  nsresult rv = NS_OK;
+  if (!aVisitor.mPresContext) {
+    return rv;
+  }
+
+  if (aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
+    WidgetMouseEvent* mouseEvent = aVisitor.mEvent->AsMouseEvent();
+    if (mouseEvent && mouseEvent->IsLeftClickEvent() &&
+        OwnerDoc()->MayHaveDOMActivateListeners()) {
+      // DOMActive event should be trusted since the activation is actually
+      // occurred even if the cause is an untrusted click event.
+      InternalUIEvent actEvent(true, eLegacyDOMActivate, mouseEvent);
+      actEvent.mDetail = 1;
+
+      if (RefPtr<PresShell> presShell = aVisitor.mPresContext->GetPresShell()) {
+        nsEventStatus status = nsEventStatus_eIgnore;
+        mInInternalActivate = true;
+        presShell->HandleDOMEventWithTarget(this, &actEvent, &status);
+        mInInternalActivate = false;
+
+        // If activate is cancelled, we must do the same as when click is
+        // cancelled (revert the checkbox to its original value).
+        if (status == nsEventStatus_eConsumeNoDefault) {
+          aVisitor.mEventStatus = status;
+        }
+      }
+    }
+  }
+
+  if (nsEventStatus_eIgnore == aVisitor.mEventStatus) {
+    WidgetKeyboardEvent* keyEvent = aVisitor.mEvent->AsKeyboardEvent();
+    if (keyEvent && keyEvent->IsTrusted()) {
+      HandleKeyboardActivation(aVisitor);
+    }
+
+    // Bug 1459231: Temporarily needed till links respect activation target
+    // Then also remove NS_OUTER_ACTIVATE_EVENT
+    if ((aVisitor.mItemFlags & NS_OUTER_ACTIVATE_EVENT) && mForm &&
+        (mType == FormControlType::ButtonReset ||
+         mType == FormControlType::ButtonSubmit)) {
+      aVisitor.mEvent->mFlags.mMultipleActionsPrevented = true;
+    }
+  }
+
+  return rv;
+}
+
+void EndSubmitClick(EventChainVisitor& aVisitor) {
+  if ((aVisitor.mItemFlags & NS_IN_SUBMIT_CLICK)) {
+    nsCOMPtr<nsIContent> content(do_QueryInterface(aVisitor.mItemData));
+    RefPtr<HTMLFormElement> form = HTMLFormElement::FromNodeOrNull(content);
+    MOZ_ASSERT(form);
+    // Tell the form that we are about to exit a click handler,
+    // so the form knows not to defer subsequent submissions.
+    // The pending ones that were created during the handler
+    // will be flushed or forgotten.
+    form->OnSubmitClickEnd();
+    // Tell the form to flush a possible pending submission.
+    // the reason is that the script returned false (the event was
+    // not ignored) so if there is a stored submission, it needs to
+    // be submitted immediatelly.
+    // Note, NS_IN_SUBMIT_CLICK is set only when we're in outer activate event.
+    form->FlushPendingSubmission();
+  }
+}
+
+void HTMLButtonElement::ActivationBehavior(EventChainPostVisitor& aVisitor) {
+  if (!aVisitor.mPresContext) {
+    // Should check whether EndSubmitClick is needed here.
+    return;
+  }
+
+  if (!IsDisabled()) {
+    if (mForm) {
+      // Hold a strong ref while dispatching
+      RefPtr<mozilla::dom::HTMLFormElement> form(mForm);
+      if (mType == FormControlType::ButtonReset) {
+        form->MaybeReset(this);
+        aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
+      } else if (mType == FormControlType::ButtonSubmit) {
+        form->MaybeSubmit(this);
+        aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
+      }
+      // https://html.spec.whatwg.org/multipage/form-elements.html#attr-button-type-button-state
+      // NS_FORM_BUTTON_BUTTON do nothing.
+    }
+    if (!GetInvokeTargetElement()) {
+      HandlePopoverTargetAction();
+    } else {
+      HandleInvokeTargetAction();
+    }
+  }
+
+  EndSubmitClick(aVisitor);
+}
+
+void HTMLButtonElement::LegacyCanceledActivationBehavior(
+    EventChainPostVisitor& aVisitor) {
+  // still need to end submission, see bug 1803805
+  // e.g. when parent element of button has event handler preventing default
+  // legacy canceled instead of activation behavior will be run
+  EndSubmitClick(aVisitor);
+}
+
+nsresult HTMLButtonElement::BindToTree(BindContext& aContext,
+                                       nsINode& aParent) {
+  nsresult rv =
+      nsGenericHTMLFormControlElementWithState::BindToTree(aContext, aParent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  UpdateBarredFromConstraintValidation();
+  UpdateValidityElementStates(false);
+
+  return NS_OK;
+}
+
+void HTMLButtonElement::UnbindFromTree(bool aNullParent) {
+  nsGenericHTMLFormControlElementWithState::UnbindFromTree(aNullParent);
+
+  UpdateBarredFromConstraintValidation();
+  UpdateValidityElementStates(false);
+}
+
+NS_IMETHODIMP
+HTMLButtonElement::Reset() { return NS_OK; }
+
+NS_IMETHODIMP
+HTMLButtonElement::SubmitNamesValues(FormData* aFormData) {
+  //
+  // We only submit if we were the button pressed
+  //
+  if (aFormData->GetSubmitterElement() != this) {
+    return NS_OK;
+  }
+
+  //
+  // Get the name (if no name, no submit)
+  //
+  nsAutoString name;
+  GetHTMLAttr(nsGkAtoms::name, name);
+  if (name.IsEmpty()) {
+    return NS_OK;
+  }
+
+  //
+  // Get the value
+  //
+  nsAutoString value;
+  GetHTMLAttr(nsGkAtoms::value, value);
+
+  //
+  // Submit
+  //
+  return aFormData->AddNameValuePair(name, value);
+}
+
+void HTMLButtonElement::DoneCreatingElement() {
+  if (!mInhibitStateRestoration) {
+    GenerateStateKey();
+    RestoreFormControlState();
+  }
+}
+
+void HTMLButtonElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+                                      const nsAttrValue* aValue, bool aNotify) {
+  if (aNotify && aName == nsGkAtoms::disabled &&
+      aNameSpaceID == kNameSpaceID_None) {
+    mDisabledChanged = true;
+  }
+
+  return nsGenericHTMLFormControlElementWithState::BeforeSetAttr(
+      aNameSpaceID, aName, aValue, aNotify);
+}
+
+void HTMLButtonElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+                                     const nsAttrValue* aValue,
+                                     const nsAttrValue* aOldValue,
+                                     nsIPrincipal* aSubjectPrincipal,
+                                     bool aNotify) {
+  if (aNameSpaceID == kNameSpaceID_None) {
+    if (aName == nsGkAtoms::type) {
+      if (aValue) {
+        mType = FormControlType(aValue->GetEnumValue());
+      } else {
+        mType = FormControlType(kButtonDefaultType->value);
+      }
+    }
+
+    if (aName == nsGkAtoms::type || aName == nsGkAtoms::disabled) {
+      if (aName == nsGkAtoms::disabled) {
+        // This *has* to be called *before* validity state check because
+        // UpdateBarredFromConstraintValidation depends on our disabled state.
+        UpdateDisabledState(aNotify);
+      }
+
+      UpdateBarredFromConstraintValidation();
+      UpdateValidityElementStates(aNotify);
+    }
+  }
+
+  return nsGenericHTMLFormControlElementWithState::AfterSetAttr(
+      aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
+}
+
+void HTMLButtonElement::SaveState() {
+  if (!mDisabledChanged) {
+    return;
+  }
+
+  PresState* state = GetPrimaryPresState();
+  if (state) {
+    // We do not want to save the real disabled state but the disabled
+    // attribute.
+    state->disabled() = HasAttr(nsGkAtoms::disabled);
+    state->disabledSet() = true;
+  }
+}
+
+bool HTMLButtonElement::RestoreState(PresState* aState) {
+  if (aState && aState->disabledSet() && !aState->disabled()) {
+    SetDisabled(false, IgnoreErrors());
+  }
+  return false;
+}
+
+void HTMLButtonElement::UpdateValidityElementStates(bool aNotify) {
+  AutoStateChangeNotifier notifier(*this, aNotify);
+  RemoveStatesSilently(ElementState::VALIDITY_STATES);
+  if (!IsCandidateForConstraintValidation()) {
+    return;
+  }
+  if (IsValid()) {
+    AddStatesSilently(ElementState::VALID | ElementState::USER_VALID);
+  } else {
+    AddStatesSilently(ElementState::INVALID | ElementState::USER_INVALID);
+  }
+}
+
+JSObject* HTMLButtonElement::WrapNode(JSContext* aCx,
+                                      JS::Handle<JSObject*> aGivenProto) {
+  return HTMLButtonElement_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+}  // namespace mozilla::dom