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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "DocAccessible.h"
#include "nsObjCExceptions.h"
#include "Accessible-inl.h"
#include "nsAccUtils.h"
#include "Role.h"
#import "mozAccessible.h"
#import "mozActionElements.h"
#import "mozHTMLAccessible.h"
#import "mozTextAccessible.h"
using namespace mozilla::a11y;
AccessibleWrap::
AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc) :
Accessible(aContent, aDoc), mNativeObject(nil),
mNativeInited(false)
{
}
AccessibleWrap::~AccessibleWrap()
{
}
mozAccessible*
AccessibleWrap::GetNativeObject()
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if (!mNativeInited && !mNativeObject && !IsDefunct() && !AncestorIsFlat())
mNativeObject = [[GetNativeType() alloc] initWithAccessible:this];
mNativeInited = true;
return mNativeObject;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
NS_IMETHODIMP
AccessibleWrap::GetNativeInterface (void **aOutInterface)
{
NS_ENSURE_ARG_POINTER(aOutInterface);
*aOutInterface = static_cast<void*>(GetNativeObject());
return *aOutInterface ? NS_OK : NS_ERROR_FAILURE;
}
// overridden in subclasses to create the right kind of object. by default we create a generic
// 'mozAccessible' node.
Class
AccessibleWrap::GetNativeType ()
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if (IsXULTabpanels())
return [mozPaneAccessible class];
roles::Role role = Role();
switch (role) {
case roles::PUSHBUTTON:
case roles::SPLITBUTTON:
case roles::TOGGLE_BUTTON:
{
// if this button may show a popup, let's make it of the popupbutton type.
return HasPopup() ? [mozPopupButtonAccessible class] :
[mozButtonAccessible class];
}
case roles::PAGETAB:
return [mozButtonAccessible class];
case roles::CHECKBUTTON:
return [mozCheckboxAccessible class];
case roles::HEADING:
return [mozHeadingAccessible class];
case roles::PAGETABLIST:
return [mozTabsAccessible class];
case roles::ENTRY:
case roles::STATICTEXT:
case roles::CAPTION:
case roles::ACCEL_LABEL:
case roles::PASSWORD_TEXT:
// normal textfield (static or editable)
return [mozTextAccessible class];
case roles::TEXT_LEAF:
return [mozTextLeafAccessible class];
case roles::LINK:
return [mozLinkAccessible class];
case roles::COMBOBOX:
return [mozPopupButtonAccessible class];
default:
return [mozAccessible class];
}
return nil;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
// this method is very important. it is fired when an accessible object "dies". after this point
// the object might still be around (because some 3rd party still has a ref to it), but it is
// in fact 'dead'.
void
AccessibleWrap::Shutdown ()
{
// this ensure we will not try to re-create the native object.
mNativeInited = true;
// we really intend to access the member directly.
if (mNativeObject) {
[mNativeObject expire];
[mNativeObject release];
mNativeObject = nil;
}
Accessible::Shutdown();
}
nsresult
AccessibleWrap::HandleAccEvent(AccEvent* aEvent)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
nsresult rv = Accessible::HandleAccEvent(aEvent);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t eventType = aEvent->GetEventType();
// ignore everything but focus-changed, value-changed, caret and selection
// events for now.
if (eventType != nsIAccessibleEvent::EVENT_FOCUS &&
eventType != nsIAccessibleEvent::EVENT_VALUE_CHANGE &&
eventType != nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED &&
eventType != nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED)
return NS_OK;
Accessible* accessible = aEvent->GetAccessible();
NS_ENSURE_STATE(accessible);
mozAccessible *nativeAcc = nil;
accessible->GetNativeInterface((void**)&nativeAcc);
if (!nativeAcc)
return NS_ERROR_FAILURE;
switch (eventType) {
case nsIAccessibleEvent::EVENT_FOCUS:
[nativeAcc didReceiveFocus];
break;
case nsIAccessibleEvent::EVENT_VALUE_CHANGE:
[nativeAcc valueDidChange];
break;
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED:
case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED:
[nativeAcc selectedTextDidChange];
break;
}
return NS_OK;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
void
AccessibleWrap::InvalidateChildren()
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
[GetNativeObject() invalidateChildren];
Accessible::InvalidateChildren();
NS_OBJC_END_TRY_ABORT_BLOCK;
}
bool
AccessibleWrap::InsertChildAt(uint32_t aIdx, Accessible* aAccessible)
{
bool inserted = Accessible::InsertChildAt(aIdx, aAccessible);
if (inserted && mNativeObject)
[mNativeObject appendChild:aAccessible];
return inserted;
}
bool
AccessibleWrap::RemoveChild(Accessible* aAccessible)
{
bool removed = Accessible::RemoveChild(aAccessible);
if (removed && mNativeObject)
[mNativeObject invalidateChildren];
return removed;
}
// if we for some reason have no native accessible, we should be skipped over (and traversed)
// when fetching all unignored children, etc. when counting unignored children, we will not be counted.
bool
AccessibleWrap::IsIgnored()
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
mozAccessible* nativeObject = GetNativeObject();
return (!nativeObject) || [nativeObject accessibilityIsIgnored];
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(false);
}
void
AccessibleWrap::GetUnignoredChildren(nsTArray<Accessible*>* aChildrenArray)
{
// we're flat; there are no children.
if (nsAccUtils::MustPrune(this))
return;
uint32_t childCount = ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
AccessibleWrap* childAcc =
static_cast<AccessibleWrap*>(GetChildAt(childIdx));
// If element is ignored, then add its children as substitutes.
if (childAcc->IsIgnored()) {
childAcc->GetUnignoredChildren(aChildrenArray);
continue;
}
aChildrenArray->AppendElement(childAcc);
}
}
Accessible*
AccessibleWrap::GetUnignoredParent() const
{
// Go up the chain to find a parent that is not ignored.
AccessibleWrap* parentWrap = static_cast<AccessibleWrap*>(Parent());
while (parentWrap && parentWrap->IsIgnored())
parentWrap = static_cast<AccessibleWrap*>(parentWrap->Parent());
return parentWrap;
}
////////////////////////////////////////////////////////////////////////////////
// AccessibleWrap protected
bool
AccessibleWrap::AncestorIsFlat()
{
// We don't create a native object if we're child of a "flat" accessible;
// for example, on OS X buttons shouldn't have any children, because that
// makes the OS confused.
//
// To maintain a scripting environment where the XPCOM accessible hierarchy
// look the same on all platforms, we still let the C++ objects be created
// though.
Accessible* parent = Parent();
while (parent) {
if (nsAccUtils::MustPrune(parent))
return true;
parent = parent->Parent();
}
// no parent was flat
return false;
}

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