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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/accessibility/ax_radio_input.h"
#include "third_party/blink/renderer/core/aom/accessible_node.h"
#include "third_party/blink/renderer/core/html/forms/html_input_element.h"
#include "third_party/blink/renderer/core/html/forms/radio_input_type.h"
#include "third_party/blink/renderer/core/input_type_names.h"
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/modules/accessibility/ax_object_cache_impl.h"
namespace blink {
AXRadioInput::AXRadioInput(LayoutObject* layout_object,
AXObjectCacheImpl& ax_object_cache)
: AXLayoutObject(layout_object, ax_object_cache) {
// Updates posInSet and setSize for the current object and the next objects.
if (!CalculatePosInSet())
return;
// When a new object is inserted, it needs to update setSize for the previous
// objects.
RequestUpdateToNextNode(false);
}
void AXRadioInput::UpdatePosAndSetSize(int position) {
if (position)
pos_in_set_ = position;
set_size_ = SizeOfRadioGroup();
}
void AXRadioInput::RequestUpdateToNextNode(bool forward) {
HTMLInputElement* next_element =
RadioInputType::NextRadioButtonInGroup(GetInputElement(), forward);
AXObject* next_axobject = AXObjectCache().Get(next_element);
if (!next_axobject || !next_axobject->IsAXRadioInput())
return;
int position = 0;
if (forward)
position = PosInSet() + 1;
// If it is backward, it keeps position as positions are already assigned for
// previous objects. updatePosAndSetSize() is called with '0' and it doesn't
// modify m_posInSet and updates m_setSize as size is increased.
ToAXRadioInput(next_axobject)->UpdatePosAndSetSize(position);
AXObjectCache().PostNotification(next_axobject,
ax::mojom::Event::kAriaAttributeChanged);
ToAXRadioInput(next_axobject)->RequestUpdateToNextNode(forward);
}
HTMLInputElement* AXRadioInput::FindFirstRadioButtonInGroup(
HTMLInputElement* current) const {
while (HTMLInputElement* prev_element =
RadioInputType::NextRadioButtonInGroup(current, false))
current = prev_element;
return current;
}
int AXRadioInput::PosInSet() const {
uint32_t pos_in_set;
if (HasAOMPropertyOrARIAAttribute(AOMUIntProperty::kPosInSet, pos_in_set))
return pos_in_set;
return pos_in_set_;
}
int AXRadioInput::SetSize() const {
int32_t set_size;
if (HasAOMPropertyOrARIAAttribute(AOMIntProperty::kSetSize, set_size))
return set_size;
return set_size_;
}
bool AXRadioInput::CalculatePosInSet() {
// Calculate 'posInSet' attribute when AXRadioInputs need to be updated
// as a new AXRadioInput Object is added or one of objects from RadioGroup is
// removed.
bool need_to_update_prev = false;
int position = 1;
HTMLInputElement* prev_element =
RadioInputType::NextRadioButtonInGroup(GetInputElement(), false);
if (prev_element) {
AXObject* object = AXObjectCache().Get(prev_element);
// If the previous element doesn't have AXObject yet, caculate position
// from the first element. Otherwise, get position from the previous
// AXObject.
if (!object || !object->IsAXRadioInput()) {
position = CountFromFirstElement();
} else {
position = object->PosInSet() + 1;
// It returns true if previous objects need to be updated.
// When AX tree exists already and a new node is inserted,
// as updating is started from the inserted node,
// we need to update setSize for previous nodes.
if (SetSize() != object->SetSize())
need_to_update_prev = true;
}
}
UpdatePosAndSetSize(position);
// If it is not the last element, request update to the next node.
if (position != SetSize())
RequestUpdateToNextNode(true);
return need_to_update_prev;
}
int AXRadioInput::CountFromFirstElement() const {
int count = 1;
HTMLInputElement* current = GetInputElement();
while (HTMLInputElement* prev_element =
RadioInputType::NextRadioButtonInGroup(current, false)) {
current = prev_element;
count++;
}
return count;
}
HTMLInputElement* AXRadioInput::GetInputElement() const {
return To<HTMLInputElement>(layout_object_->GetNode());
}
int AXRadioInput::SizeOfRadioGroup() const {
int size = GetInputElement()->SizeOfRadioGroup();
// If it has no size in Group, it means that there is only itself.
if (!size)
return 1;
return size;
}
} // namespace blink
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