1 files changed, 103 insertions, 0 deletions
diff --git a/layout/forms/HTMLSelectEventListener.h b/layout/forms/HTMLSelectEventListener.h
new file mode 100644
index 0000000000..452610a217
--- /dev/null
+++ b/layout/forms/HTMLSelectEventListener.h
@@ -0,0 +1,103 @@
+/* -*- 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_HTMLSelectEventListener_h
+#define mozilla_HTMLSelectEventListener_h
+
+#include "nsIDOMEventListener.h"
+#include "nsStubMutationObserver.h"
+
+class nsIFrame;
+class nsListControlFrame;
+
+namespace mozilla {
+
+namespace dom {
+class HTMLSelectElement;
+class HTMLOptionElement;
+class Event;
+}  // namespace dom
+
+/**
+ * HTMLSelectEventListener
+ * This class is responsible for propagating events to the select element while
+ * it has a frame.
+ * Frames are not refcounted so they can't be used as event listeners.
+ */
+
+class HTMLSelectEventListener final : public nsStubMutationObserver,
+                                      public nsIDOMEventListener {
+ public:
+  enum class SelectType : uint8_t { Listbox, Combobox };
+  HTMLSelectEventListener(dom::HTMLSelectElement& aElement,
+                          SelectType aSelectType)
+      : mElement(&aElement), mIsCombobox(aSelectType == SelectType::Combobox) {
+    Attach();
+  }
+
+  NS_DECL_ISUPPORTS
+
+  // For comboboxes, we need to keep the list up to date when options change.
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+
+  // nsIDOMEventListener
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD HandleEvent(dom::Event*) override;
+
+  void Attach();
+  void Detach();
+
+  dom::HTMLOptionElement* GetCurrentOption() const;
+
+  MOZ_CAN_RUN_SCRIPT void FireOnInputAndOnChange();
+
+ private:
+  // This is always guaranteed to be > 0, but callers want signed integers so we
+  // do the cast for them.
+  int32_t ItemsPerPage() const;
+
+  nsListControlFrame* GetListControlFrame() const;
+
+  MOZ_CAN_RUN_SCRIPT nsresult KeyDown(dom::Event*);
+  MOZ_CAN_RUN_SCRIPT nsresult KeyPress(dom::Event*);
+  MOZ_CAN_RUN_SCRIPT nsresult MouseDown(dom::Event*);
+  MOZ_CAN_RUN_SCRIPT nsresult MouseUp(dom::Event*);
+  MOZ_CAN_RUN_SCRIPT nsresult MouseMove(dom::Event*);
+
+  void AdjustIndexForDisabledOpt(int32_t aStartIndex, int32_t& aNewIndex,
+                                 int32_t aNumOptions, int32_t aDoAdjustInc,
+                                 int32_t aDoAdjustIncNext);
+  bool IsOptionInteractivelySelectable(uint32_t aIndex) const;
+  int32_t GetEndSelectionIndex() const;
+
+  MOZ_CAN_RUN_SCRIPT
+  void PostHandleKeyEvent(int32_t aNewIndex, uint32_t aCharCode, bool aIsShift,
+                          bool aIsControlOrMeta);
+
+  /**
+   * Return the first non-disabled option starting at aFromIndex (inclusive).
+   * @param aFoundIndex if non-null, set to the index of the returned option
+   */
+  dom::HTMLOptionElement* GetNonDisabledOptionFrom(
+      int32_t aFromIndex, int32_t* aFoundIndex = nullptr) const;
+
+  void ComboboxMightHaveChanged();
+  void OptionValueMightHaveChanged(nsIContent* aMutatingNode);
+
+  ~HTMLSelectEventListener();
+
+  RefPtr<dom::HTMLSelectElement> mElement;
+  const bool mIsCombobox;
+  bool mButtonDown = false;
+  bool mControlSelectMode = false;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_HTMLSelectEventListener_h