Google Git
Sign in
chromium / chromium / src / 8ed45293563fb49186ca5bd97734353337921de4 / . / third_party / blink / renderer / core / html / forms / html_select_element.cc
blob: 659073195e0bebeabba6c314b857d4db7ab3d1b8 [file] [log] [blame]
/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights
* reserved.
* (C) 2006 Alexey Proskuryakov (ap@nypop.com)
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
* (http://www.torchmobile.com/)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "third_party/blink/renderer/core/html/forms/html_select_element.h"
#include "build/build_config.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/bindings/core/v8/html_element_or_long.h"
#include "third_party/blink/renderer/bindings/core/v8/html_option_element_or_html_opt_group_element.h"
#include "third_party/blink/renderer/core/accessibility/ax_object_cache.h"
#include "third_party/blink/renderer/core/dom/attribute.h"
#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/dom/events/scoped_event_queue.h"
#include "third_party/blink/renderer/core/dom/mutation_observer.h"
#include "third_party/blink/renderer/core/dom/mutation_observer_init.h"
#include "third_party/blink/renderer/core/dom/mutation_record.h"
#include "third_party/blink/renderer/core/dom/node_computed_style.h"
#include "third_party/blink/renderer/core/dom/node_lists_node_data.h"
#include "third_party/blink/renderer/core/dom/node_traversal.h"
#include "third_party/blink/renderer/core/events/gesture_event.h"
#include "third_party/blink/renderer/core/events/keyboard_event.h"
#include "third_party/blink/renderer/core/events/mouse_event.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/html/forms/form_controller.h"
#include "third_party/blink/renderer/core/html/forms/form_data.h"
#include "third_party/blink/renderer/core/html/forms/html_form_element.h"
#include "third_party/blink/renderer/core/html/forms/html_opt_group_element.h"
#include "third_party/blink/renderer/core/html/forms/html_option_element.h"
#include "third_party/blink/renderer/core/html/forms/popup_menu.h"
#include "third_party/blink/renderer/core/html/html_hr_element.h"
#include "third_party/blink/renderer/core/html/html_slot_element.h"
#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/core/input/event_handler.h"
#include "third_party/blink/renderer/core/input/input_device_capabilities.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/layout/hit_test_request.h"
#include "third_party/blink/renderer/core/layout/hit_test_result.h"
#include "third_party/blink/renderer/core/layout/layout_list_box.h"
#include "third_party/blink/renderer/core/layout/layout_menu_list.h"
#include "third_party/blink/renderer/core/layout/layout_theme.h"
#include "third_party/blink/renderer/core/page/autoscroll_controller.h"
#include "third_party/blink/renderer/core/page/chrome_client.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/page/spatial_navigation.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
#include "third_party/blink/renderer/platform/text/platform_locale.h"
namespace blink {
using namespace HTMLNames;
// Upper limit of m_listItems. According to the HTML standard, options larger
// than this limit doesn't work well because |selectedIndex| IDL attribute is
// signed.
static const unsigned kMaxListItems = INT_MAX;
HTMLSelectElement::HTMLSelectElement(Document& document)
: HTMLFormControlElementWithState(selectTag, document),
type_ahead_(this),
size_(0),
last_on_change_option_(nullptr),
is_multiple_(false),
active_selection_state_(false),
should_recalc_list_items_(false),
is_autofilled_by_preview_(false),
index_to_select_on_cancel_(-1),
popup_is_visible_(false) {
SetHasCustomStyleCallbacks();
}
HTMLSelectElement* HTMLSelectElement::Create(Document& document) {
HTMLSelectElement* select = new HTMLSelectElement(document);
select->EnsureUserAgentShadowRoot();
return select;
}
HTMLSelectElement::~HTMLSelectElement() = default;
// static
bool HTMLSelectElement::CanAssignToSelectSlot(const Node& node) {
return node.HasTagName(optionTag) || node.HasTagName(optgroupTag) ||
node.HasTagName(hrTag);
}
const AtomicString& HTMLSelectElement::FormControlType() const {
DEFINE_STATIC_LOCAL(const AtomicString, select_multiple, ("select-multiple"));
DEFINE_STATIC_LOCAL(const AtomicString, select_one, ("select-one"));
return is_multiple_ ? select_multiple : select_one;
}
bool HTMLSelectElement::HasPlaceholderLabelOption() const {
// The select element has no placeholder label option if it has an attribute
// "multiple" specified or a display size of non-1.
//
// The condition "size() > 1" is not compliant with the HTML5 spec as of Dec
// 3, 2010. "size() != 1" is correct. Using "size() > 1" here because
// size() may be 0 in WebKit. See the discussion at
// https://bugs.webkit.org/show_bug.cgi?id=43887
//
// "0 size()" happens when an attribute "size" is absent or an invalid size
// attribute is specified. In this case, the display size should be assumed
// as the default. The default display size is 1 for non-multiple select
// elements, and 4 for multiple select elements.
//
// Finally, if size() == 0 and non-multiple, the display size can be assumed
// as 1.
if (IsMultiple() || size() > 1)
return false;
// TODO(tkent): This function is called in CSS selector matching. Using
// listItems() might have performance impact.
if (GetListItems().size() == 0 || !IsHTMLOptionElement(GetListItems()[0]))
return false;
return ToHTMLOptionElement(GetListItems()[0])->value().IsEmpty();
}
String HTMLSelectElement::validationMessage() const {
if (!willValidate())
return String();
if (CustomError())
return CustomValidationMessage();
if (ValueMissing()) {
return GetLocale().QueryString(
WebLocalizedString::kValidationValueMissingForSelect);
}
return String();
}
bool HTMLSelectElement::ValueMissing() const {
if (!willValidate())
return false;
if (!IsRequired())
return false;
int first_selection_index = selectedIndex();
// If a non-placeholer label option is selected (firstSelectionIndex > 0),
// it's not value-missing.
return first_selection_index < 0 ||
(!first_selection_index && HasPlaceholderLabelOption());
}
String HTMLSelectElement::DefaultToolTip() const {
if (Form() && Form()->NoValidate())
return String();
return validationMessage();
}
void HTMLSelectElement::SelectMultipleOptionsByPopup(
const Vector<int>& list_indices) {
DCHECK(UsesMenuList());
DCHECK(IsMultiple());
for (size_t i = 0; i < list_indices.size(); ++i) {
bool add_selection_if_not_first = i > 0;
if (HTMLOptionElement* option = OptionAtListIndex(list_indices[i]))
UpdateSelectedState(option, add_selection_if_not_first, false);
}
SetNeedsValidityCheck();
// TODO(tkent): Using listBoxOnChange() is very confusing.
ListBoxOnChange();
}
bool HTMLSelectElement::UsesMenuList() const {
if (LayoutTheme::GetTheme().DelegatesMenuListRendering())
return true;
return !is_multiple_ && size_ <= 1;
}
int HTMLSelectElement::ActiveSelectionEndListIndex() const {
HTMLOptionElement* option = ActiveSelectionEnd();
return option ? option->ListIndex() : -1;
}
HTMLOptionElement* HTMLSelectElement::ActiveSelectionEnd() const {
if (active_selection_end_)
return active_selection_end_.Get();
return LastSelectedOption();
}
void HTMLSelectElement::add(
const HTMLOptionElementOrHTMLOptGroupElement& element,
const HTMLElementOrLong& before,
ExceptionState& exception_state) {
HTMLElement* element_to_insert;
DCHECK(!element.IsNull());
if (element.IsHTMLOptionElement())
element_to_insert = element.GetAsHTMLOptionElement();
else
element_to_insert = element.GetAsHTMLOptGroupElement();
HTMLElement* before_element;
if (before.IsHTMLElement())
before_element = before.GetAsHTMLElement();
else if (before.IsLong())
before_element = options()->item(before.GetAsLong());
else
before_element = nullptr;
InsertBefore(element_to_insert, before_element, exception_state);
SetNeedsValidityCheck();
}
void HTMLSelectElement::remove(int option_index) {
if (HTMLOptionElement* option = item(option_index))
option->remove(IGNORE_EXCEPTION_FOR_TESTING);
}
String HTMLSelectElement::value() const {
if (HTMLOptionElement* option = SelectedOption())
return option->value();
return "";
}
void HTMLSelectElement::setValue(const String& value, bool send_events) {
HTMLOptionElement* option = nullptr;
// Find the option with value() matching the given parameter and make it the
// current selection.
for (auto* const item : GetOptionList()) {
if (item->value() == value) {
option = item;
break;
}
}
HTMLOptionElement* previous_selected_option = SelectedOption();
SetSuggestedOption(nullptr);
if (is_autofilled_by_preview_)
SetAutofillState(WebAutofillState::kNotFilled);
SelectOptionFlags flags = kDeselectOtherOptions | kMakeOptionDirty;
if (send_events)
flags |= kDispatchInputAndChangeEvent;
SelectOption(option, flags);
if (send_events && previous_selected_option != option && !UsesMenuList())
ListBoxOnChange();
}
String HTMLSelectElement::SuggestedValue() const {
return suggested_option_ ? suggested_option_->value() : "";
}
void HTMLSelectElement::SetSuggestedValue(const String& value) {
if (value.IsNull()) {
SetSuggestedOption(nullptr);
return;
}
for (auto* const option : GetOptionList()) {
if (option->value() == value) {
SetSuggestedOption(option);
is_autofilled_by_preview_ = true;
return;
}
}
SetSuggestedOption(nullptr);
}
bool HTMLSelectElement::IsPresentationAttribute(
const QualifiedName& name) const {
if (name == alignAttr) {
// Don't map 'align' attribute. This matches what Firefox, Opera and IE do.
// See http://bugs.webkit.org/show_bug.cgi?id=12072
return false;
}
return HTMLFormControlElementWithState::IsPresentationAttribute(name);
}
void HTMLSelectElement::ParseAttribute(
const AttributeModificationParams& params) {
if (params.name == sizeAttr) {
unsigned old_size = size_;
if (!ParseHTMLNonNegativeInteger(params.new_value, size_))
size_ = 0;
SetNeedsValidityCheck();
if (size_ != old_size) {
if (InActiveDocument())
LazyReattachIfAttached();
ResetToDefaultSelection();
if (!UsesMenuList())
SaveListboxActiveSelection();
}
} else if (params.name == multipleAttr) {
ParseMultipleAttribute(params.new_value);
} else if (params.name == accesskeyAttr) {
// FIXME: ignore for the moment.
//
} else {
HTMLFormControlElementWithState::ParseAttribute(params);
}
}
bool HTMLSelectElement::MayTriggerVirtualKeyboard() const {
return true;
}
bool HTMLSelectElement::CanSelectAll() const {
return !UsesMenuList();
}
LayoutObject* HTMLSelectElement::CreateLayoutObject(const ComputedStyle&) {
if (UsesMenuList())
return new LayoutMenuList(this);
return new LayoutListBox(this);
}
HTMLCollection* HTMLSelectElement::selectedOptions() {
return EnsureCachedCollection<HTMLCollection>(kSelectedOptions);
}
HTMLOptionsCollection* HTMLSelectElement::options() {
return EnsureCachedCollection<HTMLOptionsCollection>(kSelectOptions);
}
void HTMLSelectElement::OptionElementChildrenChanged(
const HTMLOptionElement& option) {
SetNeedsValidityCheck();
if (GetLayoutObject()) {
if (option.Selected() && UsesMenuList())
GetLayoutObject()->UpdateFromElement();
if (AXObjectCache* cache =
GetLayoutObject()->GetDocument().ExistingAXObjectCache())
cache->ChildrenChanged(this);
}
}
void HTMLSelectElement::AccessKeyAction(bool send_mouse_events) {
focus();
DispatchSimulatedClick(
nullptr, send_mouse_events ? kSendMouseUpDownEvents : kSendNoEvents);
}
Element* HTMLSelectElement::namedItem(const AtomicString& name) {
return options()->namedItem(name);
}
HTMLOptionElement* HTMLSelectElement::item(unsigned index) {
return options()->item(index);
}
void HTMLSelectElement::SetOption(unsigned index,
HTMLOptionElement* option,
ExceptionState& exception_state) {
int diff = index - length();
// We should check |index >= maxListItems| first to avoid integer overflow.
if (index >= kMaxListItems ||
GetListItems().size() + diff + 1 > kMaxListItems) {
GetDocument().AddConsoleMessage(ConsoleMessage::Create(
kJSMessageSource, kWarningMessageLevel,
String::Format("Blocked to expand the option list and set an option at "
"index=%u. The maximum list length is %u.",
index, kMaxListItems)));
return;
}
HTMLOptionElementOrHTMLOptGroupElement element;
element.SetHTMLOptionElement(option);
HTMLElementOrLong before;
// Out of array bounds? First insert empty dummies.
if (diff > 0) {
setLength(index, exception_state);
// Replace an existing entry?
} else if (diff < 0) {
before.SetHTMLElement(options()->item(index + 1));
remove(index);
}
if (exception_state.HadException())
return;
// Finally add the new element.
EventQueueScope scope;
add(element, before, exception_state);
if (diff >= 0 && option->Selected())
OptionSelectionStateChanged(option, true);
}
void HTMLSelectElement::setLength(unsigned new_len,
ExceptionState& exception_state) {
// We should check |newLen > maxListItems| first to avoid integer overflow.
if (new_len > kMaxListItems ||
GetListItems().size() + new_len - length() > kMaxListItems) {
GetDocument().AddConsoleMessage(ConsoleMessage::Create(
kJSMessageSource, kWarningMessageLevel,
String::Format("Blocked to expand the option list to %u items. The "
"maximum list length is %u.",
new_len, kMaxListItems)));
return;
}
int diff = length() - new_len;
if (diff < 0) { // Add dummy elements.
do {
AppendChild(HTMLOptionElement::Create(GetDocument()), exception_state);
if (exception_state.HadException())
break;
} while (++diff);
} else {
// Removing children fires mutation events, which might mutate the DOM
// further, so we first copy out a list of elements that we intend to
// remove then attempt to remove them one at a time.
HeapVector<Member<HTMLOptionElement>> items_to_remove;
size_t option_index = 0;
for (auto* const option : GetOptionList()) {
if (option_index++ >= new_len) {
DCHECK(option->parentNode());
items_to_remove.push_back(option);
}
}
for (auto& item : items_to_remove) {
if (item->parentNode())
item->parentNode()->RemoveChild(item.Get(), exception_state);
}
}
SetNeedsValidityCheck();
}
bool HTMLSelectElement::IsRequiredFormControl() const {
return IsRequired();
}
HTMLOptionElement* HTMLSelectElement::OptionAtListIndex(int list_index) const {
if (list_index < 0)
return nullptr;
const ListItems& items = GetListItems();
if (static_cast<size_t>(list_index) >= items.size())
return nullptr;
return ToHTMLOptionElementOrNull(items[list_index]);
}
// Returns the 1st valid OPTION |skip| items from |listIndex| in direction
// |direction| if there is one.
// Otherwise, it returns the valid OPTION closest to that boundary which is past
// |listIndex| if there is one.
// Otherwise, it returns nullptr.
// Valid means that it is enabled and visible.
HTMLOptionElement* HTMLSelectElement::NextValidOption(int list_index,
SkipDirection direction,
int skip) const {
DCHECK(direction == kSkipBackwards || direction == kSkipForwards);
const ListItems& list_items = GetListItems();
HTMLOptionElement* last_good_option = nullptr;
int size = list_items.size();
for (list_index += direction; list_index >= 0 && list_index < size;
list_index += direction) {
--skip;
HTMLElement* element = list_items[list_index];
if (!IsHTMLOptionElement(*element))
continue;
if (ToHTMLOptionElement(*element).IsDisplayNone())
continue;
if (element->IsDisabledFormControl())
continue;
if (!UsesMenuList() && !element->GetLayoutObject())
continue;
last_good_option = ToHTMLOptionElement(element);
if (skip <= 0)
break;
}
return last_good_option;
}
HTMLOptionElement* HTMLSelectElement::NextSelectableOption(
HTMLOptionElement* start_option) const {
return NextValidOption(start_option ? start_option->ListIndex() : -1,
kSkipForwards, 1);
}
HTMLOptionElement* HTMLSelectElement::PreviousSelectableOption(
HTMLOptionElement* start_option) const {
return NextValidOption(
start_option ? start_option->ListIndex() : GetListItems().size(),
kSkipBackwards, 1);
}
HTMLOptionElement* HTMLSelectElement::FirstSelectableOption() const {
// TODO(tkent): This is not efficient. nextSlectableOption(nullptr) is
// faster.
return NextValidOption(GetListItems().size(), kSkipBackwards, INT_MAX);
}
HTMLOptionElement* HTMLSelectElement::LastSelectableOption() const {
// TODO(tkent): This is not efficient. previousSlectableOption(nullptr) is
// faster.
return NextValidOption(-1, kSkipForwards, INT_MAX);
}
// Returns the index of the next valid item one page away from |startIndex| in
// direction |direction|.
HTMLOptionElement* HTMLSelectElement::NextSelectableOptionPageAway(
HTMLOptionElement* start_option,
SkipDirection direction) const {
const ListItems& items = GetListItems();
// Can't use m_size because layoutObject forces a minimum size.
int page_size = 0;
if (GetLayoutObject()->IsListBox()) {
// -1 so we still show context.
page_size = ToLayoutListBox(GetLayoutObject())->size() - 1;
}
// One page away, but not outside valid bounds.
// If there is a valid option item one page away, the index is chosen.
// If there is no exact one page away valid option, returns startIndex or
// the most far index.
int start_index = start_option ? start_option->ListIndex() : -1;
int edge_index = (direction == kSkipForwards) ? 0 : (items.size() - 1);
int skip_amount =
page_size +
((direction == kSkipForwards) ? start_index : (edge_index - start_index));
return NextValidOption(edge_index, direction, skip_amount);
}
void HTMLSelectElement::SelectAll() {
DCHECK(!UsesMenuList());
if (!GetLayoutObject() || !is_multiple_)
return;
// Save the selection so it can be compared to the new selectAll selection
// when dispatching change events.
SaveLastSelection();
active_selection_state_ = true;
SetActiveSelectionAnchor(NextSelectableOption(nullptr));
SetActiveSelectionEnd(PreviousSelectableOption(nullptr));
UpdateListBoxSelection(false, false);
ListBoxOnChange();
SetNeedsValidityCheck();
}
void HTMLSelectElement::SaveLastSelection() {
if (UsesMenuList()) {
last_on_change_option_ = SelectedOption();
return;
}
last_on_change_selection_.clear();
for (auto& element : GetListItems()) {
last_on_change_selection_.push_back(
IsHTMLOptionElement(*element) &&
ToHTMLOptionElement(element)->Selected());
}
}
void HTMLSelectElement::SetActiveSelectionAnchor(HTMLOptionElement* option) {
active_selection_anchor_ = option;
if (!UsesMenuList())
SaveListboxActiveSelection();
}
void HTMLSelectElement::SaveListboxActiveSelection() {
// Cache the selection state so we can restore the old selection as the new
// selection pivots around this anchor index.
// Example:
// 1. Press the mouse button on the second OPTION
// m_activeSelectionAnchorIndex = 1
// 2. Drag the mouse pointer onto the fifth OPTION
// m_activeSelectionEndIndex = 4, options at 1-4 indices are selected.
// 3. Drag the mouse pointer onto the fourth OPTION
// m_activeSelectionEndIndex = 3, options at 1-3 indices are selected.
// updateListBoxSelection needs to clear selection of the fifth OPTION.
cached_state_for_active_selection_.resize(0);
for (auto* const option : GetOptionList()) {
cached_state_for_active_selection_.push_back(option->Selected());
}
}
void HTMLSelectElement::SetActiveSelectionEnd(HTMLOptionElement* option) {
active_selection_end_ = option;
}
void HTMLSelectElement::UpdateListBoxSelection(bool deselect_other_options,
bool scroll) {
DCHECK(GetLayoutObject());
DCHECK(GetLayoutObject()->IsListBox() || is_multiple_);
int active_selection_anchor_index =
active_selection_anchor_ ? active_selection_anchor_->index() : -1;
int active_selection_end_index =
active_selection_end_ ? active_selection_end_->index() : -1;
int start =
std::min(active_selection_anchor_index, active_selection_end_index);
int end = std::max(active_selection_anchor_index, active_selection_end_index);
int i = 0;
for (auto* const option : GetOptionList()) {
if (option->IsDisabledFormControl() || !option->GetLayoutObject()) {
++i;
continue;
}
if (i >= start && i <= end) {
option->SetSelectedState(active_selection_state_);
option->SetDirty(true);
} else if (deselect_other_options ||
i >= static_cast<int>(
cached_state_for_active_selection_.size())) {
option->SetSelectedState(false);
option->SetDirty(true);
} else {
option->SetSelectedState(cached_state_for_active_selection_[i]);
}
++i;
}
SetNeedsValidityCheck();
if (scroll)
ScrollToSelection();
NotifyFormStateChanged();
}
void HTMLSelectElement::ListBoxOnChange() {
DCHECK(!UsesMenuList() || is_multiple_);
const ListItems& items = GetListItems();
// If the cached selection list is empty, or the size has changed, then fire
// dispatchFormControlChangeEvent, and return early.
// FIXME: Why? This looks unreasonable.
if (last_on_change_selection_.IsEmpty() ||
last_on_change_selection_.size() != items.size()) {
DispatchChangeEvent();
return;
}
// Update m_lastOnChangeSelection and fire dispatchFormControlChangeEvent.
bool fire_on_change = false;
for (unsigned i = 0; i < items.size(); ++i) {
HTMLElement* element = items[i];
bool selected = IsHTMLOptionElement(*element) &&
ToHTMLOptionElement(element)->Selected();
if (selected != last_on_change_selection_[i])
fire_on_change = true;
last_on_change_selection_[i] = selected;
}
if (fire_on_change) {
DispatchInputEvent();
DispatchChangeEvent();
}
}
void HTMLSelectElement::DispatchInputAndChangeEventForMenuList() {
DCHECK(UsesMenuList());
HTMLOptionElement* selected_option = SelectedOption();
if (last_on_change_option_.Get() != selected_option) {
last_on_change_option_ = selected_option;
DispatchInputEvent();
DispatchChangeEvent();
}
}
void HTMLSelectElement::ScrollToSelection() {
if (!IsFinishedParsingChildren())
return;
if (UsesMenuList())
return;
ScrollToOption(ActiveSelectionEnd());
if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache())
cache->ListboxActiveIndexChanged(this);
}
void HTMLSelectElement::SetOptionsChangedOnLayoutObject() {
if (LayoutObject* layout_object = GetLayoutObject()) {
if (!UsesMenuList())
return;
ToLayoutMenuList(layout_object)
->SetNeedsLayoutAndPrefWidthsRecalc(
LayoutInvalidationReason::kMenuOptionsChanged);
}
}
const HTMLSelectElement::ListItems& HTMLSelectElement::GetListItems() const {
if (should_recalc_list_items_) {
RecalcListItems();
} else {
#if DCHECK_IS_ON()
HeapVector<Member<HTMLElement>> items = list_items_;
RecalcListItems();
DCHECK(items == list_items_);
#endif
}
return list_items_;
}
void HTMLSelectElement::InvalidateSelectedItems() {
if (HTMLCollection* collection =
CachedCollection<HTMLCollection>(kSelectedOptions))
collection->InvalidateCache();
}
void HTMLSelectElement::SetRecalcListItems() {
// FIXME: This function does a bunch of confusing things depending on if it
// is in the document or not.
should_recalc_list_items_ = true;
SetOptionsChangedOnLayoutObject();
if (!isConnected()) {
if (HTMLOptionsCollection* collection =
CachedCollection<HTMLOptionsCollection>(kSelectOptions))
collection->InvalidateCache();
InvalidateSelectedItems();
}
if (GetLayoutObject()) {
if (AXObjectCache* cache =
GetLayoutObject()->GetDocument().ExistingAXObjectCache())
cache->ChildrenChanged(this);
}
}
void HTMLSelectElement::RecalcListItems() const {
TRACE_EVENT0("blink", "HTMLSelectElement::recalcListItems");
list_items_.resize(0);
should_recalc_list_items_ = false;
for (Element* current_element = ElementTraversal::FirstWithin(*this);
current_element && list_items_.size() < kMaxListItems;) {
if (!current_element->IsHTMLElement()) {
current_element =
ElementTraversal::NextSkippingChildren(*current_element, this);
continue;
}
HTMLElement& current = ToHTMLElement(*current_element);
// We should ignore nested optgroup elements. The HTML parser flatten
// them. However we need to ignore nested optgroups built by DOM APIs.
// This behavior matches to IE and Firefox.
if (IsHTMLOptGroupElement(current)) {
if (current.parentNode() != this) {
current_element = ElementTraversal::NextSkippingChildren(current, this);
continue;
}
list_items_.push_back(&current);
if (Element* next_element = ElementTraversal::FirstWithin(current)) {
current_element = next_element;
continue;
}
}
if (IsHTMLOptionElement(current))
list_items_.push_back(&current);
if (IsHTMLHRElement(current))
list_items_.push_back(&current);
// In conforming HTML code, only <optgroup> and <option> will be found
// within a <select>. We call NodeTraversal::nextSkippingChildren so
// that we only step into those tags that we choose to. For web-compat,
// we should cope with the case where odd tags like a <div> have been
// added but we handle this because such tags have already been removed
// from the <select>'s subtree at this point.
current_element =
ElementTraversal::NextSkippingChildren(*current_element, this);
}
}
void HTMLSelectElement::ResetToDefaultSelection(ResetReason reason) {
// https://html.spec.whatwg.org/multipage/forms.html#ask-for-a-reset
if (IsMultiple())
return;
HTMLOptionElement* first_enabled_option = nullptr;
HTMLOptionElement* last_selected_option = nullptr;
bool did_change = false;
int option_index = 0;
// We can't use HTMLSelectElement::options here because this function is
// called in Node::insertedInto and Node::removedFrom before invalidating
// node collections.
for (auto* const option : GetOptionList()) {
if (option->Selected()) {
if (last_selected_option) {
last_selected_option->SetSelectedState(false);
did_change = true;
}
last_selected_option = option;
}
if (!first_enabled_option && !option->IsDisabledFormControl()) {
first_enabled_option = option;
if (reason == kResetReasonSelectedOptionRemoved) {
// There must be no selected OPTIONs.
break;
}
}
++option_index;
}
if (!last_selected_option && size_ <= 1 &&
(!first_enabled_option ||
(first_enabled_option && !first_enabled_option->Selected()))) {
SelectOption(first_enabled_option,
reason == kResetReasonSelectedOptionRemoved
? 0
: kDeselectOtherOptions);
last_selected_option = first_enabled_option;
did_change = true;
}
if (did_change)
SetNeedsValidityCheck();
last_on_change_option_ = last_selected_option;
}
HTMLOptionElement* HTMLSelectElement::SelectedOption() const {
for (auto* const option : GetOptionList()) {
if (option->Selected())
return option;
}
return nullptr;
}
int HTMLSelectElement::selectedIndex() const {
unsigned index = 0;
// Return the number of the first option selected.
for (auto* const option : GetOptionList()) {
if (option->Selected())
return index;
++index;
}
return -1;
}
void HTMLSelectElement::setSelectedIndex(int index) {
SelectOption(item(index), kDeselectOtherOptions | kMakeOptionDirty);
}
int HTMLSelectElement::SelectedListIndex() const {
int index = 0;
for (const auto& item : GetListItems()) {
if (IsHTMLOptionElement(item) && ToHTMLOptionElement(item)->Selected())
return index;
++index;
}
return -1;
}
void HTMLSelectElement::SetSuggestedOption(HTMLOptionElement* option) {
if (suggested_option_ == option)
return;
suggested_option_ = option;
if (LayoutObject* layout_object = GetLayoutObject()) {
layout_object->UpdateFromElement();
ScrollToOption(option);
}
if (PopupIsVisible())
popup_->UpdateFromElement(PopupMenu::kBySelectionChange);
}
void HTMLSelectElement::ScrollToOption(HTMLOptionElement* option) {
if (!option)
return;
if (UsesMenuList())
return;
bool has_pending_task = option_to_scroll_to_;
// We'd like to keep an HTMLOptionElement reference rather than the index of
// the option because the task should work even if unselected option is
// inserted before executing scrollToOptionTask().
option_to_scroll_to_ = option;
if (!has_pending_task) {
GetDocument()
.GetTaskRunner(TaskType::kUserInteraction)
->PostTask(FROM_HERE, WTF::Bind(&HTMLSelectElement::ScrollToOptionTask,
WrapPersistent(this)));
}
}
void HTMLSelectElement::ScrollToOptionTask() {
HTMLOptionElement* option = option_to_scroll_to_.Release();
if (!option || !isConnected())
return;
// optionRemoved() makes sure m_optionToScrollTo doesn't have an option with
// another owner.
DCHECK_EQ(option->OwnerSelectElement(), this);
GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
if (!GetLayoutObject() || !GetLayoutObject()->IsListBox())
return;
LayoutRect bounds = option->BoundingBoxForScrollIntoView();
ToLayoutListBox(GetLayoutObject())->ScrollToRect(bounds);
}
void HTMLSelectElement::OptionSelectionStateChanged(HTMLOptionElement* option,
bool option_is_selected) {
DCHECK_EQ(option->OwnerSelectElement(), this);
if (option_is_selected)
SelectOption(option, IsMultiple() ? 0 : kDeselectOtherOptions);
else if (!UsesMenuList() || IsMultiple())
SelectOption(nullptr, IsMultiple() ? 0 : kDeselectOtherOptions);
else
ResetToDefaultSelection();
}
void HTMLSelectElement::OptionInserted(HTMLOptionElement& option,
bool option_is_selected) {
DCHECK_EQ(option.OwnerSelectElement(), this);
SetRecalcListItems();
if (option_is_selected) {
SelectOption(&option, IsMultiple() ? 0 : kDeselectOtherOptions);
} else {
// No need to reset if we already have a selected option.
if (!last_on_change_option_)
ResetToDefaultSelection();
}
SetNeedsValidityCheck();
last_on_change_selection_.clear();
if (!GetDocument().IsActive())
return;
GetDocument()
.GetFrame()
->GetPage()
->GetChromeClient()
.SelectFieldOptionsChanged(*this);
}
void HTMLSelectElement::OptionRemoved(HTMLOptionElement& option) {
SetRecalcListItems();
if (option.Selected())
ResetToDefaultSelection(kResetReasonSelectedOptionRemoved);
else if (!last_on_change_option_)
ResetToDefaultSelection();
if (last_on_change_option_ == &option)
last_on_change_option_.Clear();
if (option_to_scroll_to_ == &option)
option_to_scroll_to_.Clear();
if (active_selection_anchor_ == &option)
active_selection_anchor_.Clear();
if (active_selection_end_ == &option)
active_selection_end_.Clear();
if (suggested_option_ == &option)
SetSuggestedOption(nullptr);
if (option.Selected())
SetAutofillState(WebAutofillState::kNotFilled);
SetNeedsValidityCheck();
last_on_change_selection_.clear();
if (!GetDocument().IsActive())
return;
GetDocument()
.GetFrame()
->GetPage()
->GetChromeClient()
.SelectFieldOptionsChanged(*this);
}
void HTMLSelectElement::OptGroupInsertedOrRemoved(
HTMLOptGroupElement& optgroup) {
SetRecalcListItems();
SetNeedsValidityCheck();
last_on_change_selection_.clear();
}
void HTMLSelectElement::HrInsertedOrRemoved(HTMLHRElement& hr) {
SetRecalcListItems();
last_on_change_selection_.clear();
}
// TODO(tkent): This function is not efficient. It contains multiple O(N)
// operations. crbug.com/577989.
void HTMLSelectElement::SelectOption(HTMLOptionElement* element,
SelectOptionFlags flags) {
TRACE_EVENT0("blink", "HTMLSelectElement::selectOption");
bool should_update_popup = false;
// selectedOption() is O(N).
if (IsAutofilled() && SelectedOption() != element)
SetAutofillState(WebAutofillState::kNotFilled);
if (element) {
if (!element->Selected())
should_update_popup = true;
element->SetSelectedState(true);
if (flags & kMakeOptionDirty)
element->SetDirty(true);
}
// deselectItemsWithoutValidation() is O(N).
if (flags & kDeselectOtherOptions)
should_update_popup |= DeselectItemsWithoutValidation(element);
// We should update active selection after finishing OPTION state change
// because setActiveSelectionAnchorIndex() stores OPTION's selection state.
if (element) {
// setActiveSelectionAnchor is O(N).
if (!active_selection_anchor_ || !IsMultiple() ||
flags & kDeselectOtherOptions)
SetActiveSelectionAnchor(element);
if (!active_selection_end_ || !IsMultiple() ||
flags & kDeselectOtherOptions)
SetActiveSelectionEnd(element);
}
// Need to update m_lastOnChangeOption before
// LayoutMenuList::updateFromElement.
bool should_dispatch_events = false;
if (UsesMenuList()) {
should_dispatch_events = (flags & kDispatchInputAndChangeEvent) &&
last_on_change_option_ != element;
last_on_change_option_ = element;
}
// For the menu list case, this is what makes the selected element appear.
if (LayoutObject* layout_object = GetLayoutObject())
layout_object->UpdateFromElement();
// PopupMenu::updateFromElement() posts an O(N) task.
if (PopupIsVisible() && should_update_popup)
popup_->UpdateFromElement(PopupMenu::kBySelectionChange);
ScrollToSelection();
SetNeedsValidityCheck();
if (UsesMenuList()) {
if (should_dispatch_events) {
DispatchInputEvent();
DispatchChangeEvent();
}
if (LayoutObject* layout_object = GetLayoutObject()) {
// Need to check usesMenuList() again because event handlers might
// change the status.
if (UsesMenuList()) {
// didSelectOption() is O(N) because of HTMLOptionElement::index().
ToLayoutMenuList(layout_object)->DidSelectOption(element);
}
}
}
NotifyFormStateChanged();
if (Frame::HasTransientUserActivation(GetDocument().GetFrame()) &&
GetDocument().IsActive()) {
GetDocument()
.GetPage()
->GetChromeClient()
.DidChangeSelectionInSelectControl(*this);
}
}
void HTMLSelectElement::DispatchFocusEvent(
Element* old_focused_element,
WebFocusType type,
InputDeviceCapabilities* source_capabilities) {
// Save the selection so it can be compared to the new selection when
// dispatching change events during blur event dispatch.
if (UsesMenuList())
SaveLastSelection();
HTMLFormControlElementWithState::DispatchFocusEvent(old_focused_element, type,
source_capabilities);
}
void HTMLSelectElement::DispatchBlurEvent(
Element* new_focused_element,
WebFocusType type,
InputDeviceCapabilities* source_capabilities) {
type_ahead_.ResetSession();
// We only need to fire change events here for menu lists, because we fire
// change events for list boxes whenever the selection change is actually
// made. This matches other browsers' behavior.
if (UsesMenuList())
DispatchInputAndChangeEventForMenuList();
last_on_change_selection_.clear();
if (PopupIsVisible())
HidePopup();
HTMLFormControlElementWithState::DispatchBlurEvent(new_focused_element, type,
source_capabilities);
}
// Returns true if selection state of any OPTIONs is changed.
bool HTMLSelectElement::DeselectItemsWithoutValidation(
HTMLOptionElement* exclude_element) {
if (!IsMultiple() && UsesMenuList() && last_on_change_option_ &&
last_on_change_option_ != exclude_element) {
last_on_change_option_->SetSelectedState(false);
return true;
}
bool did_update_selection = false;
for (auto* const option : GetOptionList()) {
if (option != exclude_element) {
if (option->Selected())
did_update_selection = true;
option->SetSelectedState(false);
}
}
return did_update_selection;
}
FormControlState HTMLSelectElement::SaveFormControlState() const {
const ListItems& items = GetListItems();
size_t length = items.size();
FormControlState state;
for (unsigned i = 0; i < length; ++i) {
if (!IsHTMLOptionElement(*items[i]))
continue;
HTMLOptionElement* option = ToHTMLOptionElement(items[i]);
if (!option->Selected())
continue;
state.Append(option->value());
state.Append(String::Number(i));
if (!IsMultiple())
break;
}
return state;
}
size_t HTMLSelectElement::SearchOptionsForValue(const String& value,
size_t list_index_start,
size_t list_index_end) const {
const ListItems& items = GetListItems();
size_t loop_end_index =
std::min(static_cast<size_t>(items.size()), list_index_end);
for (size_t i = list_index_start; i < loop_end_index; ++i) {
if (!IsHTMLOptionElement(items[i]))
continue;
if (ToHTMLOptionElement(items[i])->value() == value)
return i;
}
return kNotFound;
}
void HTMLSelectElement::RestoreFormControlState(const FormControlState& state) {
RecalcListItems();
const ListItems& items = GetListItems();
size_t items_size = items.size();
if (items_size == 0)
return;
SelectOption(nullptr, kDeselectOtherOptions);
// The saved state should have at least one value and an index.
DCHECK_GE(state.ValueSize(), 2u);
if (!IsMultiple()) {
size_t index = state[1].ToUInt();
if (index < items_size && IsHTMLOptionElement(items[index]) &&
ToHTMLOptionElement(items[index])->value() == state[0]) {
ToHTMLOptionElement(items[index])->SetSelectedState(true);
ToHTMLOptionElement(items[index])->SetDirty(true);
last_on_change_option_ = ToHTMLOptionElement(items[index]);
} else {
size_t found_index = SearchOptionsForValue(state[0], 0, items_size);
if (found_index != kNotFound) {
ToHTMLOptionElement(items[found_index])->SetSelectedState(true);
ToHTMLOptionElement(items[found_index])->SetDirty(true);
last_on_change_option_ = ToHTMLOptionElement(items[found_index]);
}
}
} else {
size_t start_index = 0;
for (size_t i = 0; i < state.ValueSize(); i += 2) {
const String& value = state[i];
const size_t index = state[i + 1].ToUInt();
if (index < items_size && IsHTMLOptionElement(items[index]) &&
ToHTMLOptionElement(items[index])->value() == value) {
ToHTMLOptionElement(items[index])->SetSelectedState(true);
ToHTMLOptionElement(items[index])->SetDirty(true);
start_index = index + 1;
} else {
size_t found_index =
SearchOptionsForValue(value, start_index, items_size);
if (found_index == kNotFound)
found_index = SearchOptionsForValue(value, 0, start_index);
if (found_index == kNotFound)
continue;
ToHTMLOptionElement(items[found_index])->SetSelectedState(true);
ToHTMLOptionElement(items[found_index])->SetDirty(true);
start_index = found_index + 1;
}
}
}
SetNeedsValidityCheck();
}
void HTMLSelectElement::ParseMultipleAttribute(const AtomicString& value) {
bool old_multiple = is_multiple_;
HTMLOptionElement* old_selected_option = SelectedOption();
is_multiple_ = !value.IsNull();
SetNeedsValidityCheck();
LazyReattachIfAttached();
// Restore selectedIndex after changing the multiple flag to preserve
// selection as single-line and multi-line has different defaults.
if (old_multiple != is_multiple_) {
// Preserving the first selection is compatible with Firefox and
// WebKit. However Edge seems to "ask for a reset" simply. As of 2016
// March, the HTML specification says nothing about this.
if (old_selected_option)
SelectOption(old_selected_option, kDeselectOtherOptions);
else
ResetToDefaultSelection();
}
}
void HTMLSelectElement::AppendToFormData(FormData& form_data) {
const AtomicString& name = GetName();
if (name.IsEmpty())
return;
for (auto* const option : GetOptionList()) {
if (option->Selected() && !option->IsDisabledFormControl())
form_data.AppendFromElement(name, option->value());
}
}
void HTMLSelectElement::ResetImpl() {
for (auto* const option : GetOptionList()) {
option->SetSelectedState(option->FastHasAttribute(selectedAttr));
option->SetDirty(false);
}
ResetToDefaultSelection();
SetNeedsValidityCheck();
}
void HTMLSelectElement::HandlePopupOpenKeyboardEvent(Event& event) {
focus();
// Calling focus() may cause us to lose our layoutObject. Return true so
// that our caller doesn't process the event further, but don't set
// the event as handled.
if (!GetLayoutObject() || !GetLayoutObject()->IsMenuList() ||
IsDisabledFormControl())
return;
// Save the selection so it can be compared to the new selection when
// dispatching change events during selectOption, which gets called from
// selectOptionByPopup, which gets called after the user makes a selection
// from the menu.
SaveLastSelection();
ShowPopup();
event.SetDefaultHandled();
return;
}
bool HTMLSelectElement::ShouldOpenPopupForKeyDownEvent(
const KeyboardEvent& key_event) {
const String& key = key_event.key();
LayoutTheme& layout_theme = LayoutTheme::GetTheme();
if (IsSpatialNavigationEnabled(GetDocument().GetFrame()))
return false;
return ((layout_theme.PopsMenuByArrowKeys() &&
(key == "ArrowDown" || key == "ArrowUp")) ||
(layout_theme.PopsMenuByAltDownUpOrF4Key() &&
(key == "ArrowDown" || key == "ArrowUp") && key_event.altKey()) ||
(layout_theme.PopsMenuByAltDownUpOrF4Key() &&
(!key_event.altKey() && !key_event.ctrlKey() && key == "F4")));
}
bool HTMLSelectElement::ShouldOpenPopupForKeyPressEvent(
const KeyboardEvent& event) {
LayoutTheme& layout_theme = LayoutTheme::GetTheme();
int key_code = event.keyCode();
return ((layout_theme.PopsMenuBySpaceKey() && key_code == ' ' &&
!type_ahead_.HasActiveSession(event)) ||
(layout_theme.PopsMenuByReturnKey() && key_code == '\r'));
}
void HTMLSelectElement::MenuListDefaultEventHandler(Event& event) {
if (event.type() == EventTypeNames::keydown) {
if (!GetLayoutObject() || !event.IsKeyboardEvent())
return;
auto& key_event = ToKeyboardEvent(event);
if (ShouldOpenPopupForKeyDownEvent(key_event)) {
HandlePopupOpenKeyboardEvent(event);
return;
}
// When using spatial navigation, we want to be able to navigate away
// from the select element when the user hits any of the arrow keys,
// instead of changing the selection.
if (IsSpatialNavigationEnabled(GetDocument().GetFrame())) {
if (!active_selection_state_)
return;
}
// The key handling below shouldn't be used for non spatial navigation
// mode Mac
if (LayoutTheme::GetTheme().PopsMenuByArrowKeys() &&
!IsSpatialNavigationEnabled(GetDocument().GetFrame()))
return;
int ignore_modifiers = WebInputEvent::kShiftKey |
WebInputEvent::kControlKey | WebInputEvent::kAltKey |
WebInputEvent::kMetaKey;
if (key_event.GetModifiers() & ignore_modifiers)
return;
const String& key = key_event.key();
bool handled = true;
const ListItems& list_items = GetListItems();
HTMLOptionElement* option = SelectedOption();
int list_index = option ? option->ListIndex() : -1;
if (key == "ArrowDown" || key == "ArrowRight")
option = NextValidOption(list_index, kSkipForwards, 1);
else if (key == "ArrowUp" || key == "ArrowLeft")
option = NextValidOption(list_index, kSkipBackwards, 1);
else if (key == "PageDown")
option = NextValidOption(list_index, kSkipForwards, 3);
else if (key == "PageUp")
option = NextValidOption(list_index, kSkipBackwards, 3);
else if (key == "Home")
option = NextValidOption(-1, kSkipForwards, 1);
else if (key == "End")
option = NextValidOption(list_items.size(), kSkipBackwards, 1);
else
handled = false;
if (handled && option) {
SelectOption(option, kDeselectOtherOptions | kMakeOptionDirty |
kDispatchInputAndChangeEvent);
}
if (handled)
event.SetDefaultHandled();
}
if (event.type() == EventTypeNames::keypress) {
if (!GetLayoutObject() || !event.IsKeyboardEvent())
return;
int key_code = ToKeyboardEvent(event).keyCode();
if (key_code == ' ' &&
IsSpatialNavigationEnabled(GetDocument().GetFrame())) {
// Use space to toggle arrow key handling for selection change or
// spatial navigation.
active_selection_state_ = !active_selection_state_;
event.SetDefaultHandled();
return;
}
auto& key_event = ToKeyboardEvent(event);
if (ShouldOpenPopupForKeyPressEvent(key_event)) {
HandlePopupOpenKeyboardEvent(event);
return;
}
if (!LayoutTheme::GetTheme().PopsMenuByReturnKey() && key_code == '\r') {
if (Form())
Form()->SubmitImplicitly(event, false);
DispatchInputAndChangeEventForMenuList();
event.SetDefaultHandled();
}
}
if (event.type() == EventTypeNames::mousedown && event.IsMouseEvent() &&
ToMouseEvent(event).button() ==
static_cast<short>(WebPointerProperties::Button::kLeft)) {
InputDeviceCapabilities* source_capabilities =
GetDocument()
.domWindow()
->GetInputDeviceCapabilities()
->FiresTouchEvents(ToMouseEvent(event).FromTouch());
focus(FocusParams(SelectionBehaviorOnFocus::kRestore, kWebFocusTypeNone,
source_capabilities));
if (GetLayoutObject() && GetLayoutObject()->IsMenuList() &&
!IsDisabledFormControl()) {
if (PopupIsVisible()) {
HidePopup();
} else {
// Save the selection so it can be compared to the new selection
// when we call onChange during selectOption, which gets called
// from selectOptionByPopup, which gets called after the user
// makes a selection from the menu.
SaveLastSelection();
// TODO(lanwei): Will check if we need to add
// InputDeviceCapabilities here when select menu list gets
// focus, see https://crbug.com/476530.
ShowPopup();
}
}
event.SetDefaultHandled();
}
}
void HTMLSelectElement::UpdateSelectedState(HTMLOptionElement* clicked_option,
bool multi,
bool shift) {
DCHECK(clicked_option);
// Save the selection so it can be compared to the new selection when
// dispatching change events during mouseup, or after autoscroll finishes.
SaveLastSelection();
active_selection_state_ = true;
bool shift_select = is_multiple_ && shift;
bool multi_select = is_multiple_ && multi && !shift;
// Keep track of whether an active selection (like during drag selection),
// should select or deselect.
if (clicked_option->Selected() && multi_select) {
active_selection_state_ = false;
clicked_option->SetSelectedState(false);
clicked_option->SetDirty(true);
}
// If we're not in any special multiple selection mode, then deselect all
// other items, excluding the clicked option. If no option was clicked, then
// this will deselect all items in the list.
if (!shift_select && !multi_select)
DeselectItemsWithoutValidation(clicked_option);
// If the anchor hasn't been set, and we're doing a single selection or a
// shift selection, then initialize the anchor to the first selected index.
if (!active_selection_anchor_ && !multi_select)
SetActiveSelectionAnchor(SelectedOption());
// Set the selection state of the clicked option.
if (!clicked_option->IsDisabledFormControl()) {
clicked_option->SetSelectedState(true);
clicked_option->SetDirty(true);
}
// If there was no selectedIndex() for the previous initialization, or If
// we're doing a single selection, or a multiple selection (using cmd or
// ctrl), then initialize the anchor index to the listIndex that just got
// clicked.
if (!active_selection_anchor_ || !shift_select)
SetActiveSelectionAnchor(clicked_option);
SetActiveSelectionEnd(clicked_option);
UpdateListBoxSelection(!multi_select);
}
HTMLOptionElement* HTMLSelectElement::EventTargetOption(const Event& event) {
Node* target_node = event.target()->ToNode();
if (!target_node || !IsHTMLOptionElement(*target_node))
return nullptr;
return ToHTMLOptionElement(target_node);
}
int HTMLSelectElement::ListIndexForOption(const HTMLOptionElement& option) {
const ListItems& items = GetListItems();
size_t length = items.size();
for (size_t i = 0; i < length; ++i) {
if (items[i].Get() == &option)
return i;
}
return -1;
}
AutoscrollController* HTMLSelectElement::GetAutoscrollController() const {
if (Page* page = GetDocument().GetPage())
return &page->GetAutoscrollController();
return nullptr;
}
void HTMLSelectElement::HandleMouseRelease() {
// We didn't start this click/drag on any options.
if (last_on_change_selection_.IsEmpty())
return;
ListBoxOnChange();
}
void HTMLSelectElement::ListBoxDefaultEventHandler(Event& event) {
if (event.type() == EventTypeNames::gesturetap && event.IsGestureEvent()) {
focus();
// Calling focus() may cause us to lose our layoutObject or change the
// layoutObject type, in which case do not want to handle the event.
if (!GetLayoutObject() || !GetLayoutObject()->IsListBox())
return;
// Convert to coords relative to the list box if needed.
auto& gesture_event = ToGestureEvent(event);
if (HTMLOptionElement* option = EventTargetOption(gesture_event)) {
if (!IsDisabledFormControl()) {
UpdateSelectedState(option, true, gesture_event.shiftKey());
ListBoxOnChange();
}
event.SetDefaultHandled();
}
} else if (event.type() == EventTypeNames::mousedown &&
event.IsMouseEvent() &&
ToMouseEvent(event).button() ==
static_cast<short>(WebPointerProperties::Button::kLeft)) {
focus();
// Calling focus() may cause us to lose our layoutObject, in which case
// do not want to handle the event.
if (!GetLayoutObject() || !GetLayoutObject()->IsListBox() ||
IsDisabledFormControl())
return;
// Convert to coords relative to the list box if needed.
auto& mouse_event = ToMouseEvent(event);
if (HTMLOptionElement* option = EventTargetOption(mouse_event)) {
if (!option->IsDisabledFormControl()) {
#if defined(OS_MACOSX)
UpdateSelectedState(option, mouse_event.metaKey(),
mouse_event.shiftKey());
#else
UpdateSelectedState(option, mouse_event.ctrlKey(),
mouse_event.shiftKey());
#endif
}
if (LocalFrame* frame = GetDocument().GetFrame())
frame->GetEventHandler().SetMouseDownMayStartAutoscroll();
event.SetDefaultHandled();
}
} else if (event.type() == EventTypeNames::mousemove &&
event.IsMouseEvent()) {
auto& mouse_event = ToMouseEvent(event);
if (mouse_event.button() !=
static_cast<short>(WebPointerProperties::Button::kLeft) ||
!mouse_event.ButtonDown())
return;
if (LayoutObject* object = GetLayoutObject())
object->GetFrameView()->UpdateAllLifecyclePhasesExceptPaint();
if (Page* page = GetDocument().GetPage()) {
page->GetAutoscrollController().StartAutoscrollForSelection(
GetLayoutObject());
}
// Mousedown didn't happen in this element.
if (last_on_change_selection_.IsEmpty())
return;
if (HTMLOptionElement* option = EventTargetOption(mouse_event)) {
if (!IsDisabledFormControl()) {
if (is_multiple_) {
// Only extend selection if there is something selected.
if (!active_selection_anchor_)
return;
SetActiveSelectionEnd(option);
UpdateListBoxSelection(false);
} else {
SetActiveSelectionAnchor(option);
SetActiveSelectionEnd(option);
UpdateListBoxSelection(true);
}
}
}
} else if (event.type() == EventTypeNames::mouseup && event.IsMouseEvent() &&
ToMouseEvent(event).button() ==
static_cast<short>(WebPointerProperties::Button::kLeft) &&
GetLayoutObject()) {
if (GetDocument().GetPage() &&
GetDocument()
.GetPage()
->GetAutoscrollController()
.AutoscrollInProgressFor(ToLayoutBox(GetLayoutObject())))
GetDocument().GetPage()->GetAutoscrollController().StopAutoscroll();
else
HandleMouseRelease();
} else if (event.type() == EventTypeNames::keydown) {
if (!event.IsKeyboardEvent())
return;
const String& key = ToKeyboardEvent(event).key();
bool handled = false;
HTMLOptionElement* end_option = nullptr;
if (!active_selection_end_) {
// Initialize the end index
if (key == "ArrowDown" || key == "PageDown") {
HTMLOptionElement* start_option = LastSelectedOption();
handled = true;
if (key == "ArrowDown") {
end_option = NextSelectableOption(start_option);
} else {
end_option =
NextSelectableOptionPageAway(start_option, kSkipForwards);
}
} else if (key == "ArrowUp" || key == "PageUp") {
HTMLOptionElement* start_option = SelectedOption();
handled = true;
if (key == "ArrowUp") {
end_option = PreviousSelectableOption(start_option);
} else {
end_option =
NextSelectableOptionPageAway(start_option, kSkipBackwards);
}
}
} else {
// Set the end index based on the current end index.
if (key == "ArrowDown") {
end_option = NextSelectableOption(active_selection_end_.Get());
handled = true;
} else if (key == "ArrowUp") {
end_option = PreviousSelectableOption(active_selection_end_.Get());
handled = true;
} else if (key == "PageDown") {
end_option = NextSelectableOptionPageAway(active_selection_end_.Get(),
kSkipForwards);
handled = true;
} else if (key == "PageUp") {
end_option = NextSelectableOptionPageAway(active_selection_end_.Get(),
kSkipBackwards);
handled = true;
}
}
if (key == "Home") {
end_option = FirstSelectableOption();
handled = true;
} else if (key == "End") {
end_option = LastSelectableOption();
handled = true;
}
if (IsSpatialNavigationEnabled(GetDocument().GetFrame())) {
// Check if the selection moves to the boundary.
if (key == "ArrowLeft" || key == "ArrowRight" ||
((key == "ArrowDown" || key == "ArrowUp") &&
end_option == active_selection_end_))
return;
}
if (end_option && handled) {
// Save the selection so it can be compared to the new selection
// when dispatching change events immediately after making the new
// selection.
SaveLastSelection();
SetActiveSelectionEnd(end_option);
bool select_new_item =
!is_multiple_ || ToKeyboardEvent(event).shiftKey() ||
!IsSpatialNavigationEnabled(GetDocument().GetFrame());
if (select_new_item)
active_selection_state_ = true;
// If the anchor is unitialized, or if we're going to deselect all
// other options, then set the anchor index equal to the end index.
bool deselect_others =
!is_multiple_ ||
(!ToKeyboardEvent(event).shiftKey() && select_new_item);
if (!active_selection_anchor_ || deselect_others) {
if (deselect_others)
DeselectItemsWithoutValidation();
SetActiveSelectionAnchor(active_selection_end_.Get());
}
ScrollToOption(end_option);
if (select_new_item) {
UpdateListBoxSelection(deselect_others);
ListBoxOnChange();
} else {
ScrollToSelection();
}
event.SetDefaultHandled();
}
} else if (event.type() == EventTypeNames::keypress) {
if (!event.IsKeyboardEvent())
return;
int key_code = ToKeyboardEvent(event).keyCode();
if (key_code == '\r') {
if (Form())
Form()->SubmitImplicitly(event, false);
event.SetDefaultHandled();
} else if (is_multiple_ && key_code == ' ' &&
IsSpatialNavigationEnabled(GetDocument().GetFrame())) {
// Use space to toggle selection change.
active_selection_state_ = !active_selection_state_;
UpdateSelectedState(active_selection_end_.Get(), true /*multi*/,
false /*shift*/);
ListBoxOnChange();
event.SetDefaultHandled();
}
}
}
void HTMLSelectElement::DefaultEventHandler(Event& event) {
if (!GetLayoutObject())
return;
if (event.type() == EventTypeNames::click ||
event.type() == EventTypeNames::change) {
user_has_edited_the_field_ = true;
}
if (IsDisabledFormControl()) {
HTMLFormControlElementWithState::DefaultEventHandler(event);
return;
}
if (UsesMenuList())
MenuListDefaultEventHandler(event);
else
ListBoxDefaultEventHandler(event);
if (event.DefaultHandled())
return;
if (event.type() == EventTypeNames::keypress && event.IsKeyboardEvent()) {
auto& keyboard_event = ToKeyboardEvent(event);
if (!keyboard_event.ctrlKey() && !keyboard_event.altKey() &&
!keyboard_event.metaKey() &&
WTF::Unicode::IsPrintableChar(keyboard_event.charCode())) {
TypeAheadFind(keyboard_event);
event.SetDefaultHandled();
return;
}
}
HTMLFormControlElementWithState::DefaultEventHandler(event);
}
HTMLOptionElement* HTMLSelectElement::LastSelectedOption() const {
const ListItems& items = GetListItems();
for (size_t i = items.size(); i;) {
if (HTMLOptionElement* option = OptionAtListIndex(--i)) {
if (option->Selected())
return option;
}
}
return nullptr;
}
int HTMLSelectElement::IndexOfSelectedOption() const {
return SelectedListIndex();
}
int HTMLSelectElement::OptionCount() const {
return GetListItems().size();
}
String HTMLSelectElement::OptionAtIndex(int index) const {
if (HTMLOptionElement* option = OptionAtListIndex(index)) {
if (!option->IsDisabledFormControl())
return option->DisplayLabel();
}
return String();
}
void HTMLSelectElement::TypeAheadFind(const KeyboardEvent& event) {
int index = type_ahead_.HandleEvent(
event, TypeAhead::kMatchPrefix | TypeAhead::kCycleFirstChar);
if (index < 0)
return;
SelectOption(OptionAtListIndex(index), kDeselectOtherOptions |
kMakeOptionDirty |
kDispatchInputAndChangeEvent);
if (!UsesMenuList())
ListBoxOnChange();
}
void HTMLSelectElement::SelectOptionByAccessKey(HTMLOptionElement* option) {
// First bring into focus the list box.
if (!IsFocused())
AccessKeyAction(false);
if (!option || option->OwnerSelectElement() != this)
return;
EventQueueScope scope;
// If this index is already selected, unselect. otherwise update the
// selected index.
SelectOptionFlags flags =
kDispatchInputAndChangeEvent | (IsMultiple() ? 0 : kDeselectOtherOptions);
if (option->Selected()) {
if (UsesMenuList())
SelectOption(nullptr, flags);
else
option->SetSelectedState(false);
} else {
SelectOption(option, flags);
}
option->SetDirty(true);
if (UsesMenuList())
return;
ListBoxOnChange();
ScrollToSelection();
}
unsigned HTMLSelectElement::length() const {
unsigned options = 0;
for (auto* const option : GetOptionList()) {
ALLOW_UNUSED_LOCAL(option);
++options;
}
return options;
}
void HTMLSelectElement::FinishParsingChildren() {
HTMLFormControlElementWithState::FinishParsingChildren();
if (UsesMenuList())
return;
ScrollToOption(SelectedOption());
if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache())
cache->ListboxActiveIndexChanged(this);
}
bool HTMLSelectElement::AnonymousIndexedSetter(
unsigned index,
HTMLOptionElement* value,
ExceptionState& exception_state) {
if (!value) { // undefined or null
remove(index);
return true;
}
SetOption(index, value, exception_state);
return true;
}
bool HTMLSelectElement::IsInteractiveContent() const {
return true;
}
bool HTMLSelectElement::SupportsAutofocus() const {
return true;
}
void HTMLSelectElement::Trace(blink::Visitor* visitor) {
visitor->Trace(list_items_);
visitor->Trace(last_on_change_option_);
visitor->Trace(active_selection_anchor_);
visitor->Trace(active_selection_end_);
visitor->Trace(option_to_scroll_to_);
visitor->Trace(suggested_option_);
visitor->Trace(popup_);
visitor->Trace(popup_updater_);
HTMLFormControlElementWithState::Trace(visitor);
}
void HTMLSelectElement::DidAddUserAgentShadowRoot(ShadowRoot& root) {
root.AppendChild(
HTMLSlotElement::CreateUserAgentCustomAssignSlot(GetDocument()));
}
HTMLOptionElement* HTMLSelectElement::SpatialNavigationFocusedOption() {
if (!IsSpatialNavigationEnabled(GetDocument().GetFrame()))
return nullptr;
HTMLOptionElement* focused_option = ActiveSelectionEnd();
if (!focused_option)
focused_option = FirstSelectableOption();
return focused_option;
}
String HTMLSelectElement::ItemText(const Element& element) const {
String item_string;
if (auto* optgroup = ToHTMLOptGroupElementOrNull(element))
item_string = optgroup->GroupLabelText();
else if (auto* option = ToHTMLOptionElementOrNull(element))
item_string = option->TextIndentedToRespectGroupLabel();
if (GetLayoutObject() && GetLayoutObject()->Style())
GetLayoutObject()->Style()->ApplyTextTransform(&item_string);
return item_string;
}
bool HTMLSelectElement::ItemIsDisplayNone(Element& element) const {
if (auto* option = ToHTMLOptionElementOrNull(element))
return option->IsDisplayNone();
const ComputedStyle* style = ItemComputedStyle(element);
return !style || style->Display() == EDisplay::kNone;
}
const ComputedStyle* HTMLSelectElement::ItemComputedStyle(
Element& element) const {
return element.GetComputedStyle() ? element.GetComputedStyle()
: element.EnsureComputedStyle();
}
LayoutUnit HTMLSelectElement::ClientPaddingLeft() const {
if (GetLayoutObject() && GetLayoutObject()->IsMenuList())
return ToLayoutMenuList(GetLayoutObject())->ClientPaddingLeft();
return LayoutUnit();
}
LayoutUnit HTMLSelectElement::ClientPaddingRight() const {
if (GetLayoutObject() && GetLayoutObject()->IsMenuList())
return ToLayoutMenuList(GetLayoutObject())->ClientPaddingRight();
return LayoutUnit();
}
void HTMLSelectElement::PopupDidHide() {
popup_is_visible_ = false;
UnobserveTreeMutation();
if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache()) {
if (GetLayoutObject() && GetLayoutObject()->IsMenuList())
cache->DidHideMenuListPopup(ToLayoutMenuList(GetLayoutObject()));
}
}
void HTMLSelectElement::SetIndexToSelectOnCancel(int list_index) {
index_to_select_on_cancel_ = list_index;
if (GetLayoutObject())
GetLayoutObject()->UpdateFromElement();
}
HTMLOptionElement* HTMLSelectElement::OptionToBeShown() const {
if (HTMLOptionElement* option = OptionAtListIndex(index_to_select_on_cancel_))
return option;
if (suggested_option_)
return suggested_option_;
// TODO(tkent): We should not call optionToBeShown() in isMultiple() case.
if (IsMultiple())
return SelectedOption();
DCHECK_EQ(SelectedOption(), last_on_change_option_);
return last_on_change_option_;
}
void HTMLSelectElement::SelectOptionByPopup(int list_index) {
DCHECK(UsesMenuList());
// Check to ensure a page navigation has not occurred while the popup was
// up.
Document& doc = GetDocument();
if (&doc != doc.GetFrame()->GetDocument())
return;
SetIndexToSelectOnCancel(-1);
HTMLOptionElement* option = OptionAtListIndex(list_index);
// Bail out if this index is already the selected one, to avoid running
// unnecessary JavaScript that can mess up autofill when there is no actual
// change (see https://bugs.webkit.org/show_bug.cgi?id=35256 and
// <rdar://7467917>). The selectOption function does not behave this way,
// possibly because other callers need a change event even in cases where
// the selected option is not change.
if (option == SelectedOption())
return;
SelectOption(option, kDeselectOtherOptions | kMakeOptionDirty |
kDispatchInputAndChangeEvent);
}
void HTMLSelectElement::PopupDidCancel() {
if (index_to_select_on_cancel_ >= 0)
SelectOptionByPopup(index_to_select_on_cancel_);
}
void HTMLSelectElement::ProvisionalSelectionChanged(unsigned list_index) {
SetIndexToSelectOnCancel(list_index);
}
void HTMLSelectElement::ShowPopup() {
if (PopupIsVisible())
return;
if (GetDocument().GetPage()->GetChromeClient().HasOpenedPopup())
return;
if (!GetLayoutObject() || !GetLayoutObject()->IsMenuList())
return;
if (VisibleBoundsInVisualViewport().IsEmpty())
return;
if (!popup_) {
popup_ = GetDocument().GetPage()->GetChromeClient().OpenPopupMenu(
*GetDocument().GetFrame(), *this);
}
if (!popup_)
return;
popup_is_visible_ = true;
ObserveTreeMutation();
LayoutMenuList* menu_list = ToLayoutMenuList(GetLayoutObject());
popup_->Show();
if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache())
cache->DidShowMenuListPopup(menu_list);
}
void HTMLSelectElement::HidePopup() {
if (popup_)
popup_->Hide();
}
void HTMLSelectElement::DidRecalcStyle(StyleRecalcChange change) {
HTMLFormControlElementWithState::DidRecalcStyle(change);
if (PopupIsVisible())
popup_->UpdateFromElement(PopupMenu::kByStyleChange);
}
void HTMLSelectElement::DetachLayoutTree(const AttachContext& context) {
HTMLFormControlElementWithState::DetachLayoutTree(context);
if (popup_)
popup_->DisconnectClient();
popup_is_visible_ = false;
popup_ = nullptr;
UnobserveTreeMutation();
}
void HTMLSelectElement::ResetTypeAheadSessionForTesting() {
type_ahead_.ResetSession();
}
// PopupUpdater notifies updates of the specified SELECT element subtree to
// a PopupMenu object.
class HTMLSelectElement::PopupUpdater : public MutationObserver::Delegate {
public:
explicit PopupUpdater(HTMLSelectElement& select)
: select_(select), observer_(MutationObserver::Create(this)) {
MutationObserverInit init;
init.setAttributeOldValue(true);
init.setAttributes(true);
// Observe only attributes which affect popup content.
init.setAttributeFilter({"disabled", "label", "selected", "value"});
init.setCharacterData(true);
init.setCharacterDataOldValue(true);
init.setChildList(true);
init.setSubtree(true);
observer_->observe(select_, init, ASSERT_NO_EXCEPTION);
}
ExecutionContext* GetExecutionContext() const override {
return &select_->GetDocument();
}
void Deliver(const MutationRecordVector& records,
MutationObserver&) override {
// We disconnect the MutationObserver when a popup is closed. However
// MutationObserver can call back after disconnection.
if (!select_->PopupIsVisible())
return;
for (const auto& record : records) {
if (record->type() == "attributes") {
const Element& element = *ToElement(record->target());
if (record->oldValue() == element.getAttribute(record->attributeName()))
continue;
} else if (record->type() == "characterData") {
if (record->oldValue() == record->target()->nodeValue())
continue;
}
select_->DidMutateSubtree();
return;
}
}
void Dispose() { observer_->disconnect(); }
void Trace(blink::Visitor* visitor) override {
visitor->Trace(select_);
visitor->Trace(observer_);
MutationObserver::Delegate::Trace(visitor);
}
private:
Member<HTMLSelectElement> select_;
Member<MutationObserver> observer_;
};
void HTMLSelectElement::ObserveTreeMutation() {
DCHECK(!popup_updater_);
popup_updater_ = new PopupUpdater(*this);
}
void HTMLSelectElement::UnobserveTreeMutation() {
if (!popup_updater_)
return;
popup_updater_->Dispose();
popup_updater_ = nullptr;
}
void HTMLSelectElement::DidMutateSubtree() {
DCHECK(PopupIsVisible());
DCHECK(popup_);
popup_->UpdateFromElement(PopupMenu::kByDOMChange);
}
void HTMLSelectElement::CloneNonAttributePropertiesFrom(
const Element& source,
CloneChildrenFlag flag) {
const auto& source_element = static_cast<const HTMLSelectElement&>(source);
user_has_edited_the_field_ = source_element.user_has_edited_the_field_;
HTMLFormControlElement::CloneNonAttributePropertiesFrom(source, flag);
}
} // namespace blink