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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 */
#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 {
enum class SelectType : uint8_t { Listbox, Combobox };
HTMLSelectEventListener(dom::HTMLSelectElement& aElement,
SelectType aSelectType)
: mElement(&aElement), mIsCombobox(aSelectType == SelectType::Combobox) {
// For comboboxes, we need to keep the list up to date when options change.
// 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();
// 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;
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);
RefPtr<dom::HTMLSelectElement> mElement;
const bool mIsCombobox;
bool mButtonDown = false;
bool mControlSelectMode = false;
} // namespace mozilla
#endif // mozilla_HTMLSelectEventListener_h