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Mozilla/mozilla/accessible/src/html/nsHTMLSelectAccessible.cpp
aaronleventhal%moonset.net 5671b624b1 Bug 312792. Crash exposing dynamically changing <option> lists. r=parente, sr=bz 
git-svn-id: svn://10.0.0.236/trunk@182478 18797224-902f-48f8-a5cc-f745e15eee43
2005-10-18 19:17:07 +00:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Kyle Yuan (kyle.yuan@sun.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsHTMLSelectAccessible.h"
#include "nsIAccessibilityService.h"
#include "nsIAccessibleEvent.h"
#include "nsIFrame.h"
#include "nsIComboboxControlFrame.h"
#include "nsIDocument.h"
#include "nsIDOMHTMLInputElement.h"
#include "nsIDOMHTMLOptGroupElement.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIListControlFrame.h"
#include "nsIServiceManager.h"
#include "nsITextContent.h"
#include "nsArray.h"
/**
* Selects, Listboxes and Comboboxes, are made up of a number of different
* widgets, some of which are shared between the two. This file contains
* all of the widgets for both of the Selects, for HTML only.
*
* Listbox:
* - nsHTMLSelectListAccessible
* - nsHTMLSelectOptionAccessible
*
* Comboboxes:
* - nsHTMLComboboxAccessible
* - nsHTMLComboboxTextFieldAccessible
* - nsHTMLComboboxButtonAccessible
* - nsHTMLComboboxListAccessible [ inserted in accessible tree ]
* - nsHTMLSelectOptionAccessible(s)
*/
/** ------------------------------------------------------ */
/** Impl. of nsHTMLSelectableAccessible */
/** ------------------------------------------------------ */
// Helper class
nsHTMLSelectableAccessible::iterator::iterator(nsHTMLSelectableAccessible *aParent, nsIWeakReference *aWeakShell):
mWeakShell(aWeakShell), mParentSelect(aParent)
{
mLength = mIndex = 0;
mSelCount = 0;
nsCOMPtr<nsIDOMHTMLSelectElement> htmlSelect(do_QueryInterface(mParentSelect->mDOMNode));
if (htmlSelect) {
htmlSelect->GetOptions(getter_AddRefs(mOptions));
if (mOptions)
mOptions->GetLength(&mLength);
}
}
PRBool nsHTMLSelectableAccessible::iterator::Advance()
{
if (mIndex < mLength) {
nsCOMPtr<nsIDOMNode> tempNode;
if (mOptions) {
mOptions->Item(mIndex, getter_AddRefs(tempNode));
mOption = do_QueryInterface(tempNode);
}
mIndex++;
return PR_TRUE;
}
return PR_FALSE;
}
void nsHTMLSelectableAccessible::iterator::CalcSelectionCount(PRInt32 *aSelectionCount)
{
PRBool isSelected = PR_FALSE;
if (mOption)
mOption->GetSelected(&isSelected);
if (isSelected)
(*aSelectionCount)++;
}
void nsHTMLSelectableAccessible::iterator::AddAccessibleIfSelected(nsIAccessibilityService *aAccService,
nsIMutableArray *aSelectedAccessibles,
nsPresContext *aContext)
{
PRBool isSelected = PR_FALSE;
nsCOMPtr<nsIAccessible> tempAccess;
if (mOption) {
mOption->GetSelected(&isSelected);
if (isSelected) {
nsCOMPtr<nsIDOMNode> optionNode(do_QueryInterface(mOption));
aAccService->GetAccessibleInWeakShell(optionNode, mWeakShell, getter_AddRefs(tempAccess));
}
}
if (tempAccess)
aSelectedAccessibles->AppendElement(NS_STATIC_CAST(nsISupports*, tempAccess), PR_FALSE);
}
PRBool nsHTMLSelectableAccessible::iterator::GetAccessibleIfSelected(PRInt32 aIndex,
nsIAccessibilityService *aAccService,
nsPresContext *aContext,
nsIAccessible **aAccessible)
{
PRBool isSelected = PR_FALSE;
*aAccessible = nsnull;
if (mOption) {
mOption->GetSelected(&isSelected);
if (isSelected) {
if (mSelCount == aIndex) {
nsCOMPtr<nsIDOMNode> optionNode(do_QueryInterface(mOption));
aAccService->GetAccessibleInWeakShell(optionNode, mWeakShell, aAccessible);
return PR_TRUE;
}
mSelCount++;
}
}
return PR_FALSE;
}
void nsHTMLSelectableAccessible::iterator::Select(PRBool aSelect)
{
if (mOption)
mOption->SetSelected(aSelect);
}
nsHTMLSelectableAccessible::nsHTMLSelectableAccessible(nsIDOMNode* aDOMNode,
nsIWeakReference* aShell):
nsAccessibleWrap(aDOMNode, aShell)
{
}
NS_IMPL_ISUPPORTS_INHERITED1(nsHTMLSelectableAccessible, nsAccessible, nsIAccessibleSelectable)
// Helper methods
NS_IMETHODIMP nsHTMLSelectableAccessible::ChangeSelection(PRInt32 aIndex, PRUint8 aMethod, PRBool *aSelState)
{
*aSelState = PR_FALSE;
nsCOMPtr<nsIDOMHTMLSelectElement> htmlSelect(do_QueryInterface(mDOMNode));
if (!htmlSelect)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMHTMLOptionsCollection> options;
htmlSelect->GetOptions(getter_AddRefs(options));
if (!options)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMNode> tempNode;
options->Item(aIndex, getter_AddRefs(tempNode));
nsCOMPtr<nsIDOMHTMLOptionElement> tempOption(do_QueryInterface(tempNode));
if (!tempOption)
return NS_ERROR_FAILURE;
tempOption->GetSelected(aSelState);
nsresult rv = NS_OK;
if (eSelection_Add == aMethod && !(*aSelState))
rv = tempOption->SetSelected(PR_TRUE);
else if (eSelection_Remove == aMethod && (*aSelState))
rv = tempOption->SetSelected(PR_FALSE);
return rv;
}
// Interface methods
NS_IMETHODIMP nsHTMLSelectableAccessible::GetSelectedChildren(nsIArray **_retval)
{
*_retval = nsnull;
nsCOMPtr<nsIAccessibilityService> accService(do_GetService("@mozilla.org/accessibilityService;1"));
if (!accService)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIMutableArray> selectedAccessibles;
NS_NewArray(getter_AddRefs(selectedAccessibles));
if (!selectedAccessibles)
return NS_ERROR_OUT_OF_MEMORY;
nsPresContext *context = GetPresContext();
if (!context)
return NS_ERROR_FAILURE;
nsHTMLSelectableAccessible::iterator iter(this, mWeakShell);
while (iter.Advance())
iter.AddAccessibleIfSelected(accService, selectedAccessibles, context);
PRUint32 uLength = 0;
selectedAccessibles->GetLength(&uLength);
if (uLength != 0) { // length of nsIArray containing selected options
*_retval = selectedAccessibles;
NS_ADDREF(*_retval);
}
return NS_OK;
}
// return the nth selected child's nsIAccessible object
NS_IMETHODIMP nsHTMLSelectableAccessible::RefSelection(PRInt32 aIndex, nsIAccessible **_retval)
{
*_retval = nsnull;
nsCOMPtr<nsIAccessibilityService> accService(do_GetService("@mozilla.org/accessibilityService;1"));
if (!accService)
return NS_ERROR_FAILURE;
nsPresContext *context = GetPresContext();
if (!context)
return NS_ERROR_FAILURE;
nsHTMLSelectableAccessible::iterator iter(this, mWeakShell);
while (iter.Advance())
if (iter.GetAccessibleIfSelected(aIndex, accService, context, _retval))
return NS_OK;
// No matched item found
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP nsHTMLSelectableAccessible::GetSelectionCount(PRInt32 *aSelectionCount)
{
*aSelectionCount = 0;
nsHTMLSelectableAccessible::iterator iter(this, mWeakShell);
while (iter.Advance())
iter.CalcSelectionCount(aSelectionCount);
return NS_OK;
}
NS_IMETHODIMP nsHTMLSelectableAccessible::AddChildToSelection(PRInt32 aIndex)
{
PRBool isSelected;
return ChangeSelection(aIndex, eSelection_Add, &isSelected);
}
NS_IMETHODIMP nsHTMLSelectableAccessible::RemoveChildFromSelection(PRInt32 aIndex)
{
PRBool isSelected;
return ChangeSelection(aIndex, eSelection_Remove, &isSelected);
}
NS_IMETHODIMP nsHTMLSelectableAccessible::IsChildSelected(PRInt32 aIndex, PRBool *_retval)
{
*_retval = PR_FALSE;
return ChangeSelection(aIndex, eSelection_GetState, _retval);
}
NS_IMETHODIMP nsHTMLSelectableAccessible::ClearSelection()
{
nsHTMLSelectableAccessible::iterator iter(this, mWeakShell);
while (iter.Advance())
iter.Select(PR_FALSE);
return NS_OK;
}
NS_IMETHODIMP nsHTMLSelectableAccessible::SelectAllSelection(PRBool *_retval)
{
*_retval = PR_FALSE;
nsCOMPtr<nsIDOMHTMLSelectElement> htmlSelect(do_QueryInterface(mDOMNode));
if (!htmlSelect)
return NS_ERROR_FAILURE;
htmlSelect->GetMultiple(_retval);
if (*_retval) {
nsHTMLSelectableAccessible::iterator iter(this, mWeakShell);
while (iter.Advance())
iter.Select(PR_TRUE);
}
return NS_OK;
}
/** ------------------------------------------------------ */
/** First, the common widgets */
/** ------------------------------------------------------ */
/** ----- nsHTMLSelectListAccessible ----- */
/** Default Constructor */
nsHTMLSelectListAccessible::nsHTMLSelectListAccessible(nsIDOMNode* aDOMNode,
nsIWeakReference* aShell)
:nsHTMLSelectableAccessible(aDOMNode, aShell)
{
}
/**
* As a nsHTMLSelectListAccessible we can have the following states:
* STATE_MULTISELECTABLE
* STATE_EXTSELECTABLE
*/
NS_IMETHODIMP nsHTMLSelectListAccessible::GetState(PRUint32 *_retval)
{
nsHTMLSelectableAccessible::GetState(_retval);
nsCOMPtr<nsIDOMHTMLSelectElement> select (do_QueryInterface(mDOMNode));
if ( select ) {
PRBool multiple;
select->GetMultiple(&multiple);
if ( multiple )
*_retval |= STATE_MULTISELECTABLE | STATE_EXTSELECTABLE;
}
return NS_OK;
}
NS_IMETHODIMP nsHTMLSelectListAccessible::GetRole(PRUint32 *_retval)
{
*_retval = ROLE_LIST;
return NS_OK;
}
already_AddRefed<nsIAccessible>
nsHTMLSelectListAccessible::AccessibleForOption(nsIAccessibilityService *aAccService,
nsIContent *aContent,
nsIAccessible *aLastGoodAccessible)
{
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(aContent));
NS_ASSERTION(domNode, "DOM node is null");
// Accessibility service will initialize & cache any accessibles created
nsCOMPtr<nsIAccessible> accessible;
aAccService->GetAccessibleInWeakShell(domNode, mWeakShell, getter_AddRefs(accessible));
nsCOMPtr<nsPIAccessible> privateAccessible(do_QueryInterface(accessible));
if (!privateAccessible) {
return nsnull;
}
++ mAccChildCount;
privateAccessible->SetParent(this);
nsCOMPtr<nsPIAccessible> privatePrevAccessible(do_QueryInterface(aLastGoodAccessible));
if (privatePrevAccessible) {
privatePrevAccessible->SetNextSibling(accessible);
}
if (!mFirstChild) {
mFirstChild = accessible;
}
nsIAccessible *returnAccessible = accessible;
NS_ADDREF(returnAccessible);
return returnAccessible;
}
already_AddRefed<nsIAccessible>
nsHTMLSelectListAccessible::CacheOptSiblings(nsIAccessibilityService *aAccService,
nsIContent *aParentContent,
nsIAccessible *aLastGoodAccessible)
{
// Recursive helper for CacheChildren()
PRUint32 numChildren = aParentContent->GetChildCount();
nsCOMPtr<nsIAccessible> lastGoodAccessible(aLastGoodAccessible);
for (PRUint32 count = 0; count < numChildren; count ++) {
nsIContent *childContent = aParentContent->GetChildAt(count);
if (!childContent->IsContentOfType(nsIContent::eHTML)) {
continue;
}
nsCOMPtr<nsIAtom> tag = childContent->Tag();
if (tag == nsAccessibilityAtoms::option || tag == nsAccessibilityAtoms::optgroup) {
lastGoodAccessible = AccessibleForOption(aAccService,
childContent,
lastGoodAccessible);
if (tag == nsAccessibilityAtoms::optgroup) {
lastGoodAccessible = CacheOptSiblings(aAccService, childContent,
lastGoodAccessible);
}
}
}
if (lastGoodAccessible) {
nsCOMPtr<nsPIAccessible> privateLastAcc =
do_QueryInterface(lastGoodAccessible);
privateLastAcc->SetNextSibling(nsnull);
NS_ADDREF(aLastGoodAccessible = lastGoodAccessible);
}
return aLastGoodAccessible;
}
/**
* Cache the children and child count of a Select List Accessible. We want to count
* all the <optgroup>s and <option>s as children because we want a
* flat tree under the Select List.
*/
void nsHTMLSelectListAccessible::CacheChildren(PRBool aWalkAnonContent)
{
// Cache the number of <optgroup> and <option> DOM decendents,
// as well as the accessibles for them. Avoid whitespace text nodes.
nsCOMPtr<nsIContent> selectContent(do_QueryInterface(mDOMNode));
nsCOMPtr<nsIAccessibilityService> accService(do_GetService("@mozilla.org/accessibilityService;1"));
if (!selectContent || !accService) {
mAccChildCount = eChildCountUninitialized;
return;
}
mAccChildCount = 0;
nsCOMPtr<nsIAccessible> lastGoodAccessible =
CacheOptSiblings(accService, selectContent, nsnull);
}
/** ----- nsHTMLSelectOptionAccessible ----- */
/** Default Constructor */
nsHTMLSelectOptionAccessible::nsHTMLSelectOptionAccessible(nsIDOMNode* aDOMNode, nsIWeakReference* aShell):
nsLeafAccessible(aDOMNode, aShell)
{
nsCOMPtr<nsIAccessibilityService> accService(do_GetService("@mozilla.org/accessibilityService;1"));
nsCOMPtr<nsIDOMNode> parentNode;
aDOMNode->GetParentNode(getter_AddRefs(parentNode));
nsCOMPtr<nsIAccessible> parentAccessible;
if (parentNode) {
// If the parent node is a Combobox, then the option's accessible parent
// is nsHTMLComboboxListAccessible, not the nsHTMLComboboxAccessible that
// GetParent would normally return. This is because the
// nsHTMLComboboxListAccessible is inserted into the accessible hierarchy
// where there is no DOM node for it.
accService->GetAccessibleInWeakShell(parentNode, mWeakShell, getter_AddRefs(parentAccessible));
if (parentAccessible) {
PRUint32 role;
parentAccessible->GetRole(&role);
if (role == ROLE_COMBOBOX) {
nsCOMPtr<nsIAccessible> comboAccessible(parentAccessible);
comboAccessible->GetLastChild(getter_AddRefs(parentAccessible));
}
}
}
SetParent(parentAccessible);
}
/** We are a ListItem */
NS_IMETHODIMP nsHTMLSelectOptionAccessible::GetRole(PRUint32 *aRole)
{
*aRole = ROLE_LISTITEM;
return NS_OK;
}
/**
* Get our Name from our Content's subtree
*/
NS_IMETHODIMP nsHTMLSelectOptionAccessible::GetName(nsAString& aName)
{
// CASE #1 -- great majority of the cases
// find the label attribute - this is what the W3C says we should use
nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(mDOMNode));
NS_ASSERTION(domElement, "No domElement for accessible DOM node!");
nsresult rv = domElement->GetAttribute(NS_LITERAL_STRING("label"), aName) ;
if (NS_SUCCEEDED(rv) && !aName.IsEmpty() ) {
return NS_OK;
}
// CASE #2 -- no label parameter, get the first child,
// use it if it is a text node
nsCOMPtr<nsIDOMNode> child;
mDOMNode->GetFirstChild(getter_AddRefs(child));
if (child) {
nsCOMPtr<nsITextContent> text(do_QueryInterface(child));
if (text) {
nsAutoString txtValue;
rv = AppendFlatStringFromContentNode(text, &txtValue);
if (NS_SUCCEEDED(rv)) {
// Temp var (txtValue) needed until CompressWhitespace built for nsAString
txtValue.CompressWhitespace();
aName.Assign(txtValue);
return NS_OK;
}
}
}
return NS_ERROR_FAILURE;
}
nsIFrame* nsHTMLSelectOptionAccessible::GetBoundsFrame()
{
nsCOMPtr<nsIContent> selectContent(do_QueryInterface(mDOMNode));
while (selectContent && selectContent->Tag() != nsAccessibilityAtoms::select) {
selectContent = selectContent->GetParent();
}
nsCOMPtr<nsIDOMNode> selectNode(do_QueryInterface(selectContent));
if (selectNode) {
nsCOMPtr<nsIAccessibilityService> accService(do_GetService("@mozilla.org/accessibilityService;1"));
nsCOMPtr<nsIAccessible> selAcc;
if (NS_SUCCEEDED(accService->GetAccessibleFor(selectNode,
getter_AddRefs(selAcc)))) {
PRUint32 state;
selAcc->GetFinalState(&state);
if (state & STATE_COLLAPSED) {
nsCOMPtr<nsIPresShell> presShell(GetPresShell());
if (!presShell) {
return nsnull;
}
return presShell->GetPrimaryFrameFor(selectContent);
}
}
}
return nsAccessible::GetBoundsFrame();
}
/**
* As a nsHTMLSelectOptionAccessible we can have the following states:
* STATE_SELECTABLE
* STATE_SELECTED
* STATE_FOCUSED
* STATE_FOCUSABLE
* STATE_INVISIBLE -- not implemented yet
*/
NS_IMETHODIMP nsHTMLSelectOptionAccessible::GetState(PRUint32 *_retval)
{
*_retval = 0;
nsCOMPtr<nsIDOMNode> focusedOptionNode, parentNode;
// Go up to parent <select> element
nsCOMPtr<nsIDOMNode> thisNode(do_QueryInterface(mDOMNode));
do {
thisNode->GetParentNode(getter_AddRefs(parentNode));
nsCOMPtr<nsIDOMHTMLSelectElement> selectControl(do_QueryInterface(parentNode));
if (selectControl) {
break;
}
thisNode = parentNode;
} while (parentNode);
if (!parentNode) {
return NS_ERROR_FAILURE;
}
// find out if we are the focused node
GetFocusedOptionNode(parentNode, getter_AddRefs(focusedOptionNode));
if (focusedOptionNode == mDOMNode)
*_retval |= STATE_FOCUSED;
// Are we selected?
nsCOMPtr<nsIDOMHTMLOptionElement> option (do_QueryInterface(mDOMNode));
if ( option ) {
PRBool isSelected = PR_FALSE;
option->GetSelected(&isSelected);
if ( isSelected )
*_retval |= STATE_SELECTED;
}
*_retval |= STATE_SELECTABLE | STATE_FOCUSABLE;
return NS_OK;
}
/** select us! close combo box if necessary*/
NS_IMETHODIMP nsHTMLSelectOptionAccessible::GetActionName(PRUint8 index, nsAString& _retval)
{
if (index == eAction_Select) {
nsAccessible::GetTranslatedString(NS_LITERAL_STRING("select"), _retval);
return NS_OK;
}
return NS_ERROR_INVALID_ARG;
}
NS_IMETHODIMP nsHTMLSelectOptionAccessible::GetNumActions(PRUint8 *_retval)
{
*_retval = eSingle_Action;
return NS_OK;
}
NS_IMETHODIMP nsHTMLSelectOptionAccessible::DoAction(PRUint8 index)
{
if (index == eAction_Select) { // default action
nsCOMPtr<nsIDOMHTMLOptionElement> newHTMLOption(do_QueryInterface(mDOMNode));
if (!newHTMLOption)
return NS_ERROR_FAILURE;
// Clear old selection
nsCOMPtr<nsIDOMNode> oldHTMLOptionNode, selectNode;
nsCOMPtr<nsIAccessible> parent;
GetParent(getter_AddRefs(parent));
nsCOMPtr<nsIAccessNode> accessNode(do_QueryInterface(parent));
NS_ASSERTION(accessNode, "Unable to QI to nsIAccessNode");
accessNode->GetDOMNode(getter_AddRefs(selectNode));
GetFocusedOptionNode(selectNode, getter_AddRefs(oldHTMLOptionNode));
nsCOMPtr<nsIDOMHTMLOptionElement> oldHTMLOption(do_QueryInterface(oldHTMLOptionNode));
if (oldHTMLOption)
oldHTMLOption->SetSelected(PR_FALSE);
// Set new selection
newHTMLOption->SetSelected(PR_TRUE);
// If combo box, and open, close it
// First, get the <select> widgets list control frame
nsCOMPtr<nsIDOMNode> testSelectNode;
nsCOMPtr<nsIDOMNode> thisNode(do_QueryInterface(mDOMNode));
do {
thisNode->GetParentNode(getter_AddRefs(testSelectNode));
nsCOMPtr<nsIDOMHTMLSelectElement> selectControl(do_QueryInterface(testSelectNode));
if (selectControl)
break;
thisNode = testSelectNode;
} while (testSelectNode);
nsCOMPtr<nsIPresShell> presShell(do_QueryReferent(mWeakShell));
nsCOMPtr<nsIContent> selectContent(do_QueryInterface(testSelectNode));
nsCOMPtr<nsIDOMHTMLOptionElement> option(do_QueryInterface(mDOMNode));
if (!testSelectNode || !selectContent || !presShell || !option)
return NS_ERROR_FAILURE;
nsIFrame *selectFrame = presShell->GetPrimaryFrameFor(selectContent);
nsIComboboxControlFrame *comboBoxFrame = nsnull;
CallQueryInterface(selectFrame, &comboBoxFrame);
if (comboBoxFrame) {
nsIFrame *listFrame = nsnull;
comboBoxFrame->GetDropDown(&listFrame);
PRBool isDroppedDown;
comboBoxFrame->IsDroppedDown(&isDroppedDown);
if (isDroppedDown && listFrame) {
// use this list control frame to roll up the list
nsIListControlFrame *listControlFrame = nsnull;
listFrame->QueryInterface(NS_GET_IID(nsIListControlFrame), (void**)&listControlFrame);
if (listControlFrame) {
PRInt32 newIndex = 0;
option->GetIndex(&newIndex);
listControlFrame->ComboboxFinish(newIndex);
}
}
}
return NS_OK;
}
return NS_ERROR_INVALID_ARG;
}
/**
* Helper method for getting the focused DOM Node from our parent(list) node. We
* need to use the frame to get the focused option because for some reason we
* weren't getting the proper notification when the focus changed using the DOM
*/
nsresult nsHTMLSelectOptionAccessible::GetFocusedOptionNode(nsIDOMNode *aListNode,
nsIDOMNode **aFocusedOptionNode)
{
*aFocusedOptionNode = nsnull;
NS_ASSERTION(aListNode, "Called GetFocusedOptionNode without a valid list node");
nsCOMPtr<nsIContent> content(do_QueryInterface(aListNode));
nsCOMPtr<nsIDocument> document = content->GetDocument();
nsIPresShell *shell = nsnull;
if (document)
shell = document->GetShellAt(0);
if (!shell)
return NS_ERROR_FAILURE;
nsIFrame *frame = shell->GetPrimaryFrameFor(content);
if (!frame)
return NS_ERROR_FAILURE;
PRInt32 focusedOptionIndex = 0;
// Get options
nsCOMPtr<nsIDOMHTMLSelectElement> selectElement(do_QueryInterface(aListNode));
NS_ASSERTION(selectElement, "No select element where it should be");
nsCOMPtr<nsIDOMHTMLOptionsCollection> options;
nsresult rv = selectElement->GetOptions(getter_AddRefs(options));
if (NS_SUCCEEDED(rv)) {
nsIListControlFrame *listFrame = nsnull;
frame->QueryInterface(NS_GET_IID(nsIListControlFrame), (void**)&listFrame);
if (listFrame) {
// Get what's focused in listbox by asking frame for "selected item".
// Can't use dom interface for this, because it will always return the first selected item
// when there is more than 1 item selected. We need the focused item, not
// the first selected item.
rv = listFrame->GetSelectedIndex(&focusedOptionIndex);
}
else // Combo boxes can only have 1 selected option, so they can use the dom interface for this
rv = selectElement->GetSelectedIndex(&focusedOptionIndex);
}
// Either use options and focused index, or default to list node itself
if (NS_SUCCEEDED(rv) && options && focusedOptionIndex >= 0) // Something is focused
rv = options->Item(focusedOptionIndex, aFocusedOptionNode);
else { // If no options in list or focusedOptionIndex <0, then we are not focused on an item
NS_ADDREF(*aFocusedOptionNode = aListNode); // return normal target content
rv = NS_OK;
}
return rv;
}
void nsHTMLSelectOptionAccessible::SelectionChangedIfOption(nsIContent *aPossibleOption)
{
if (!aPossibleOption || aPossibleOption->Tag() != nsAccessibilityAtoms::option ||
!aPossibleOption->IsContentOfType(nsIContent::eHTML)) {
return;
}
nsCOMPtr<nsIDOMNode> optionNode(do_QueryInterface(aPossibleOption));
NS_ASSERTION(optionNode, "No option node for nsIContent with option tag!");
nsCOMPtr<nsIAccessible> multiSelect = GetMultiSelectFor(optionNode);
nsCOMPtr<nsPIAccessible> privateMultiSelect = do_QueryInterface(multiSelect);
if (!privateMultiSelect) {
return;
}
nsCOMPtr<nsIAccessibilityService> accService =
do_GetService("@mozilla.org/accessibilityService;1");
nsCOMPtr<nsIAccessible> optionAccessible;
accService->GetAccessibleFor(optionNode, getter_AddRefs(optionAccessible));
if (!optionAccessible) {
return;
}
privateMultiSelect->FireToolkitEvent(nsIAccessibleEvent::EVENT_SELECTION_WITHIN,
multiSelect, nsnull);
PRUint32 state;
optionAccessible->GetFinalState(&state);
PRUint32 eventType = (state & STATE_SELECTED) ?
nsIAccessibleEvent::EVENT_SELECTION_ADD :
nsIAccessibleEvent::EVENT_SELECTION_REMOVE;
privateMultiSelect->FireToolkitEvent(eventType, optionAccessible, nsnull);
}
/** ----- nsHTMLSelectOptGroupAccessible ----- */
/** Default Constructor */
nsHTMLSelectOptGroupAccessible::nsHTMLSelectOptGroupAccessible(nsIDOMNode* aDOMNode, nsIWeakReference* aShell):
nsHTMLSelectOptionAccessible(aDOMNode, aShell)
{
}
/**
* As a nsHTMLSelectOptGroupAccessible we can have the following states:
* STATE_SELECTABLE
*/
NS_IMETHODIMP nsHTMLSelectOptGroupAccessible::GetState(PRUint32 *_retval)
{
nsHTMLSelectOptionAccessible::GetState(_retval);
*_retval &= ~(STATE_FOCUSABLE|STATE_SELECTABLE);
return NS_OK;
}
NS_IMETHODIMP nsHTMLSelectOptGroupAccessible::DoAction(PRUint8 index)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsHTMLSelectOptGroupAccessible::GetActionName(PRUint8 index, nsAString& _retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsHTMLSelectOptGroupAccessible::GetNumActions(PRUint8 *_retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
/** ------------------------------------------------------ */
/** Finally, the Combobox widgets */
/** ------------------------------------------------------ */
/** ----- nsHTMLComboboxAccessible ----- */
nsHTMLComboboxAccessible::nsHTMLComboboxAccessible(nsIDOMNode* aDOMNode, nsIWeakReference* aShell):
nsHTMLSelectableAccessible(aDOMNode, aShell)
{
}
/** We are a combobox */
NS_IMETHODIMP nsHTMLComboboxAccessible::GetRole(PRUint32 *_retval)
{
*_retval = ROLE_COMBOBOX;
return NS_OK;
}
NS_IMETHODIMP nsHTMLComboboxAccessible::Shutdown()
{
nsHTMLSelectableAccessible::Shutdown();
mComboboxTextFieldAccessible = nsnull;
mComboboxButtonAccessible = nsnull;
mComboboxListAccessible = nsnull;
return NS_OK;
}
NS_IMETHODIMP nsHTMLComboboxAccessible::Init()
{
// Hold references
GetFirstChild(getter_AddRefs(mComboboxTextFieldAccessible));
if (mComboboxTextFieldAccessible) {
mComboboxTextFieldAccessible->GetNextSibling(getter_AddRefs(mComboboxButtonAccessible));
}
if (mComboboxButtonAccessible) {
mComboboxButtonAccessible->GetNextSibling(getter_AddRefs(mComboboxListAccessible));
}
nsHTMLSelectableAccessible::Init();
return NS_OK;
}
/**
* We always have 3 children: TextField, Button, Window. In that order
*/
NS_IMETHODIMP nsHTMLComboboxAccessible::GetChildCount(PRInt32 *_retval)
{
*_retval = 3;
return NS_OK;
}
/**
* As a nsHTMLComboboxAccessible we can have the following states:
* STATE_FOCUSED
* STATE_READONLY
* STATE_FOCUSABLE
* STATE_HASPOPUP
* STATE_EXPANDED
* STATE_COLLAPSED
*/
NS_IMETHODIMP nsHTMLComboboxAccessible::GetState(PRUint32 *_retval)
{
// Get focus status from base class
nsAccessible::GetState(_retval);
// we are open or closed
PRBool isOpen = PR_FALSE;
nsIFrame *frame = GetBoundsFrame();
nsIComboboxControlFrame *comboFrame = nsnull;
frame->QueryInterface(NS_GET_IID(nsIComboboxControlFrame), (void**)&comboFrame);
if (comboFrame)
comboFrame->IsDroppedDown(&isOpen);
if (isOpen)
*_retval |= STATE_EXPANDED;
else
*_retval |= STATE_COLLAPSED;
*_retval |= STATE_HASPOPUP | STATE_READONLY | STATE_FOCUSABLE;
return NS_OK;
}
/**
* Our last child is an nsHTMLComboboxListAccessible object, is also the third child
*/
NS_IMETHODIMP nsHTMLComboboxAccessible::GetLastChild(nsIAccessible **aLastChild)
{
// It goes: textfield, button, list. We're returning the list.
return GetChildAt(2, aLastChild);
}
/**
* Our first child is an nsHTMLComboboxTextFieldAccessible object
*/
NS_IMETHODIMP nsHTMLComboboxAccessible::GetFirstChild(nsIAccessible **aFirstChild)
{
if (mFirstChild) {
*aFirstChild = mFirstChild;
}
else {
nsHTMLComboboxTextFieldAccessible* accessible =
new nsHTMLComboboxTextFieldAccessible(this, mDOMNode, mWeakShell);
*aFirstChild = accessible;
if (! *aFirstChild)
return NS_ERROR_FAILURE;
accessible->Init();
SetFirstChild(*aFirstChild);
}
NS_ADDREF(*aFirstChild);
return NS_OK;
}
NS_IMETHODIMP nsHTMLComboboxAccessible::GetDescription(nsAString& aDescription)
{
// Use description of currently focused option
aDescription.Truncate();
nsCOMPtr<nsIAccessible> optionAccessible = GetFocusedOptionAccessible();
NS_ENSURE_TRUE(optionAccessible, NS_ERROR_FAILURE);
return optionAccessible->GetDescription(aDescription);
}
already_AddRefed<nsIAccessible>
nsHTMLComboboxAccessible::GetFocusedOptionAccessible()
{
if (!mWeakShell) {
return nsnull; // Shut down
}
nsCOMPtr<nsIComboboxControlFrame> cbxFrame = do_QueryInterface(GetFrame());
if (!cbxFrame) {
return nsnull;
}
nsIFrame *listFrame = nsnull;
cbxFrame->GetDropDown(&listFrame);
if (!listFrame) {
return nsnull;
}
nsCOMPtr<nsIDOMNode> listNode = do_QueryInterface(listFrame->GetContent());
nsCOMPtr<nsIDOMNode> focusedOptionNode;
nsHTMLSelectOptionAccessible::GetFocusedOptionNode(listNode, getter_AddRefs(focusedOptionNode));
nsCOMPtr<nsIAccessibilityService> accService =
do_GetService("@mozilla.org/accessibilityService;1");
if (!focusedOptionNode || !accService) {
return nsnull;
}
nsIAccessible *optionAccessible;
accService->GetAccessibleInWeakShell(focusedOptionNode, mWeakShell,
&optionAccessible);
return optionAccessible;
}
/**
* MSAA/ATK accessible value != HTML value, especially not in combo boxes.
* Our accessible value is the text label for of our ( first ) selected child.
* The easiest way to get this is from the first child which is the readonly textfield.
*/
NS_IMETHODIMP nsHTMLComboboxAccessible::GetValue(nsAString& aValue)
{
// Use label of currently focused option
nsCOMPtr<nsIAccessible> optionAccessible = GetFocusedOptionAccessible();
NS_ENSURE_TRUE(optionAccessible, NS_ERROR_FAILURE);
return optionAccessible->GetName(aValue);
}
/** ----- nsHTMLComboboxTextFieldAccessible ----- */
/** Constructor */
nsHTMLComboboxTextFieldAccessible::nsHTMLComboboxTextFieldAccessible(nsIAccessible* aParent,
nsIDOMNode* aDOMNode,
nsIWeakReference* aShell):
nsLeafAccessible(aDOMNode, aShell)
{
// There is no cache entry for this item.
// It's generated and ref'd by nsHTMLComboboxAccessible
SetParent(aParent);
}
/**
* Our next sibling is an nsHTMLComboboxButtonAccessible object
*/
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetNextSibling(nsIAccessible **aNextSibling)
{
if (mNextSibling) {
*aNextSibling = mNextSibling;
}
else {
nsHTMLComboboxButtonAccessible* accessible =
new nsHTMLComboboxButtonAccessible(mParent, mDOMNode, mWeakShell);
*aNextSibling = accessible;
if (!*aNextSibling)
return NS_ERROR_FAILURE;
accessible->Init();
}
NS_ADDREF(*aNextSibling);
return NS_OK;
}
/**
* Currently gets the text from the first option, needs to check for selection
* and then return that text.
* Walks the Frame tree and checks for proper frames.
*/
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetValue(nsAString& _retval)
{
nsIFrame* frame = nsAccessible::GetBoundsFrame();
if (!frame)
return NS_ERROR_FAILURE;
frame = frame->GetFirstChild(nsnull)->GetFirstChild(nsnull);
nsIContent* content = frame->GetContent();
if (!content)
return NS_ERROR_FAILURE;
AppendFlatStringFromSubtree(content, &_retval);
return NS_OK;
}
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetUniqueID(void **aUniqueID)
{
// Since mDOMNode is same for all tree item, use |this| pointer as the unique Id
*aUniqueID = NS_STATIC_CAST(void*, this);
return NS_OK;
}
/**
* Gets the bounds for the BlockFrame.
* Walks the Frame tree and checks for proper frames.
*/
void nsHTMLComboboxTextFieldAccessible::GetBoundsRect(nsRect& aBounds, nsIFrame** aBoundingFrame)
{
// get our first child's frame
nsIFrame* frame = nsAccessible::GetBoundsFrame();
if (!frame)
return;
frame = frame->GetFirstChild(nsnull);
*aBoundingFrame = frame;
aBounds = frame->GetRect();
}
/** Return our cached parent */
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetParent(nsIAccessible **_retval)
{
*_retval = mParent;
NS_IF_ADDREF(*_retval);
return NS_OK;
}
/**
* We are the first child of our parent, no previous sibling
*/
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetPreviousSibling(nsIAccessible **_retval)
{
*_retval = nsnull;
return NS_OK;
}
/**
* Our role is currently only static text, but we should be able to have
* editable text here and we need to check that case.
*/
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetRole(PRUint32 *_retval)
{
*_retval = ROLE_STATICTEXT;
return NS_OK;
}
/**
* As a nsHTMLComboboxTextFieldAccessible we can have the following states:
* STATE_READONLY
* STATE_FOCUSED
* STATE_FOCUSABLE
*/
NS_IMETHODIMP nsHTMLComboboxTextFieldAccessible::GetState(PRUint32 *_retval)
{
// Get focus status from base class
nsAccessible::GetState(_retval);
*_retval |= STATE_READONLY | STATE_FOCUSABLE;
return NS_OK;
}
/** -----ComboboxButtonAccessible ----- */
/** Constructor -- cache our parent */
nsHTMLComboboxButtonAccessible::nsHTMLComboboxButtonAccessible(nsIAccessible* aParent,
nsIDOMNode* aDOMNode,
nsIWeakReference* aShell):
nsLeafAccessible(aDOMNode, aShell)
{
// There is no cache entry for this item.
// It's generated and ref'd by nsHTMLComboboxAccessible
SetParent(aParent);
}
/** Just one action ( click ). */
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetNumActions(PRUint8 *aNumActions)
{
*aNumActions = eSingle_Action;
return NS_OK;
}
/**
* Programmaticaly click on the button, causing either the display or
* the hiding of the drop down box ( window ).
* Walks the Frame tree and checks for proper frames.
*/
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::DoAction(PRUint8 aIndex)
{
nsIFrame* frame = nsAccessible::GetBoundsFrame();
nsPresContext *context = GetPresContext();
if (!frame || !context)
return NS_ERROR_FAILURE;
frame = frame->GetFirstChild(nsnull)->GetNextSibling();
// We only have one action, click. Any other index is meaningless(wrong)
if (aIndex == eAction_Click) {
nsCOMPtr<nsIDOMHTMLInputElement>
element(do_QueryInterface(frame->GetContent()));
if (element)
{
element->Click();
return NS_OK;
}
return NS_ERROR_FAILURE;
}
return NS_ERROR_INVALID_ARG;
}
/**
* Our action name is the reverse of our state:
* if we are closed -> open is our name.
* if we are open -> closed is our name.
* Uses the frame to get the state, updated on every click
*/
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetActionName(PRUint8 aIndex, nsAString& _retval)
{
PRBool isOpen = PR_FALSE;
nsIFrame *boundsFrame = GetBoundsFrame();
nsIComboboxControlFrame* comboFrame;
boundsFrame->QueryInterface(NS_GET_IID(nsIComboboxControlFrame), (void**)&comboFrame);
if (!comboFrame)
return NS_ERROR_FAILURE;
comboFrame->IsDroppedDown(&isOpen);
if (isOpen)
nsAccessible::GetTranslatedString(NS_LITERAL_STRING("close"), _retval);
else
nsAccessible::GetTranslatedString(NS_LITERAL_STRING("open"), _retval);
return NS_OK;
}
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetUniqueID(void **aUniqueID)
{
// Since mDOMNode is same for all tree item, use |this| pointer as the unique Id
*aUniqueID = NS_STATIC_CAST(void*, this);
return NS_OK;
}
/**
* Gets the bounds for the gfxButtonControlFrame.
* Walks the Frame tree and checks for proper frames.
*/
void nsHTMLComboboxButtonAccessible::GetBoundsRect(nsRect& aBounds, nsIFrame** aBoundingFrame)
{
// get our second child's frame
// bounding frame is the ComboboxControlFrame
nsIFrame *frame = nsAccessible::GetBoundsFrame();
*aBoundingFrame = frame;
nsPresContext *context = GetPresContext();
if (!frame || !context)
return;
aBounds = frame->GetFirstChild(nsnull)->GetNextSibling()->GetRect();
// sibling frame is for the button
}
/** We are a button. */
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetRole(PRUint32 *_retval)
{
*_retval = ROLE_PUSHBUTTON;
return NS_OK;
}
/** Return our cached parent */
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetParent(nsIAccessible **aParent)
{
NS_IF_ADDREF(*aParent = mParent);
return NS_OK;
}
/**
* Gets the name from GetActionName()
*/
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetName(nsAString& _retval)
{
return GetActionName(eAction_Click, _retval);
}
/**
* As a nsHTMLComboboxButtonAccessible we can have the following states:
* STATE_PRESSED
* STATE_FOCUSED
* STATE_FOCUSABLE
*/
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetState(PRUint32 *_retval)
{
// Get focus status from base class
nsAccessible::GetState(_retval);
// we are open or closed --> pressed or not
PRBool isOpen = PR_FALSE;
nsIFrame *boundsFrame = GetBoundsFrame();
nsIComboboxControlFrame* comboFrame;
boundsFrame->QueryInterface(NS_GET_IID(nsIComboboxControlFrame), (void**)&comboFrame);
if (!comboFrame)
return NS_ERROR_FAILURE;
comboFrame->IsDroppedDown(&isOpen);
if (isOpen)
*_retval |= STATE_PRESSED;
*_retval |= STATE_FOCUSABLE;
return NS_OK;
}
/**
* Our next sibling is an nsHTMLComboboxListAccessible object
*/
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetNextSibling(nsIAccessible **aNextSibling)
{
if (mNextSibling) {
*aNextSibling = mNextSibling;
}
else {
nsHTMLComboboxListAccessible* accessible =
new nsHTMLComboboxListAccessible(mParent, mDOMNode, mWeakShell);
*aNextSibling = accessible;
if (!*aNextSibling)
return NS_ERROR_OUT_OF_MEMORY;
accessible->Init();
}
NS_ADDREF(*aNextSibling);
return NS_OK;
}
/**
* Our prev sibling is an nsHTMLComboboxTextFieldAccessible object
*/
NS_IMETHODIMP nsHTMLComboboxButtonAccessible::GetPreviousSibling(nsIAccessible **aAccPrevSibling)
{
return mParent->GetFirstChild(aAccPrevSibling);
}
/** ----- nsHTMLComboboxListAccessible ----- */
nsHTMLComboboxListAccessible::nsHTMLComboboxListAccessible(nsIAccessible *aParent,
nsIDOMNode* aDOMNode,
nsIWeakReference* aShell):
nsHTMLSelectListAccessible(aDOMNode, aShell)
{
// There is no cache entry for this item.
// It's generated and ref'd by nsHTMLComboboxAccessible
SetParent(aParent);
}
/**
* As a nsHTMLComboboxListAccessible we can have the following states:
* STATE_FOCUSED
* STATE_FOCUSABLE
* STATE_INVISIBLE
* STATE_FLOATING
*/
NS_IMETHODIMP nsHTMLComboboxListAccessible::GetState(PRUint32 *aState)
{
// Get focus status from base class
nsAccessible::GetState(aState);
// we are open or closed
PRBool isOpen = PR_FALSE;
nsIFrame *boundsFrame = GetBoundsFrame();
nsIComboboxControlFrame* comboFrame = nsnull;
boundsFrame->QueryInterface(NS_GET_IID(nsIComboboxControlFrame), (void**)&comboFrame);
if (!comboFrame)
return NS_ERROR_FAILURE;
comboFrame->IsDroppedDown(&isOpen);
if (isOpen)
*aState |= STATE_FLOATING | STATE_FOCUSABLE;
else
*aState |= STATE_INVISIBLE | STATE_FOCUSABLE;
return NS_OK;
}
/** Return our cached parent */
NS_IMETHODIMP nsHTMLComboboxListAccessible::GetParent(nsIAccessible **aParent)
{
NS_IF_ADDREF(*aParent = mParent);
return NS_OK;
}
NS_IMETHODIMP nsHTMLComboboxListAccessible::GetPreviousSibling(nsIAccessible **aAccPrevSibling)
{
return mParent->GetChildAt(1, aAccPrevSibling);
}
NS_IMETHODIMP nsHTMLComboboxListAccessible::GetUniqueID(void **aUniqueID)
{
// Since mDOMNode is same for all tree item, use |this| pointer as the unique Id
*aUniqueID = NS_STATIC_CAST(void*, this);
return NS_OK;
}
/**
* Gets the bounds for the areaFrame.
* Walks the Frame tree and checks for proper frames.
*/
void nsHTMLComboboxListAccessible::GetBoundsRect(nsRect& aBounds, nsIFrame** aBoundingFrame)
{
// get our first option
nsCOMPtr<nsIDOMNode> child;
mDOMNode->GetFirstChild(getter_AddRefs(child));
// now get its frame
nsCOMPtr<nsIPresShell> shell(do_QueryReferent(mWeakShell));
if (!shell) {
*aBoundingFrame = nsnull;
return;
}
nsCOMPtr<nsIContent> content(do_QueryInterface(child));
nsIFrame* frame = shell->GetPrimaryFrameFor(content);
if (!frame) {
*aBoundingFrame = nsnull;
return;
}
*aBoundingFrame = frame->GetParent();
aBounds = (*aBoundingFrame)->GetRect();
}
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