pjs/extensions/xforms/nsXFormsSwitchElement.cpp

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/* -*- Mode: C++; tab-width: 2; 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 XForms support.
*
* The Initial Developer of the Original Code is
* Olli Pettay.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Olli Pettay <Olli.Pettay@helsinki.fi> (original author)
*
* 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 "nsIDOMElement.h"
#include "nsIDOMDocument.h"
#include "nsString.h"
#include "nsIDocument.h"
#include "nsIDOMNodeList.h"
// For focus control
#include "nsPIDOMWindow.h"
#include "nsIFocusController.h"
#include "nsIXTFXMLVisualWrapper.h"
#include "nsXFormsUtils.h"
#include "nsXFormsControlStub.h"
#include "nsIModelElementPrivate.h"
#include "nsIXFormsSwitchElement.h"
#include "nsIXFormsCaseElement.h"
#include "nsXFormsDelegateStub.h"
/**
* Implementation of the XForms \<switch\> element.
*
* @see http://www.w3.org/TR/xforms/slice9.html#id2631571
*/
class nsXFormsSwitchElement : public nsIXFormsSwitchElement,
public nsXFormsDelegateStub
{
public:
nsXFormsSwitchElement() : mAddingChildren(PR_FALSE) {}
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIXFORMSSWITCHELEMENT
NS_IMETHOD OnCreated(nsIXTFBindableElementWrapper *aWrapper);
NS_IMETHOD ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex);
NS_IMETHOD ChildAppended(nsIDOMNode *aChild);
NS_IMETHOD WillRemoveChild(PRUint32 aIndex);
NS_IMETHOD BeginAddingChildren();
NS_IMETHOD DoneAddingChildren();
// nsIXFormsControl
NS_IMETHOD IsEventTarget(PRBool *aOK);
#ifdef DEBUG_smaug
virtual const char* Name() { return "switch"; }
#endif
private:
/**
* http://www.w3.org/TR/xforms/slice9.html#ui-case
* "If multiple cases within a switch are marked as
* selected="true", the first selected case remains and all
* others are deselected. If none are selected, the first becomes selected."
*
* This method returns the first selected case.
*/
already_AddRefed<nsIDOMElement>
FindFirstSelectedCase(nsIDOMElement* aDeselected = nsnull);
void Init(nsIDOMElement* aDeselected = nsnull);
/**
* This is called when a case is added or removed dynamically.
*/
void CaseChanged(nsIDOMNode* aCase, PRBool aRemoved);
/**
* Checks if any element in aDeselected has focus and if yes
* tries to focus first focusable element in aSelected.
*/
void SetFocus(nsIDOMElement* aDeselected, nsIDOMElement* aSelected);
nsCOMPtr<nsIDOMElement> mSelected;
PRBool mAddingChildren;
};
NS_IMPL_ISUPPORTS_INHERITED1(nsXFormsSwitchElement,
nsXFormsDelegateStub,
nsIXFormsSwitchElement)
NS_IMETHODIMP
nsXFormsSwitchElement::OnCreated(nsIXTFBindableElementWrapper *aWrapper)
{
nsresult rv = nsXFormsDelegateStub::OnCreated(aWrapper);
NS_ENSURE_SUCCESS(rv, rv);
aWrapper->SetNotificationMask(kStandardNotificationMask |
nsIXTFElement::NOTIFY_BEGIN_ADDING_CHILDREN |
nsIXTFElement::NOTIFY_DONE_ADDING_CHILDREN |
nsIXTFElement::NOTIFY_CHILD_APPENDED |
nsIXTFElement::NOTIFY_CHILD_INSERTED |
nsIXTFElement::NOTIFY_WILL_REMOVE_CHILD);
return NS_OK;
}
NS_IMETHODIMP
nsXFormsSwitchElement::ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex)
{
if (!mAddingChildren)
CaseChanged(aChild, PR_FALSE);
return NS_OK;
}
NS_IMETHODIMP
nsXFormsSwitchElement::ChildAppended(nsIDOMNode *aChild)
{
if (!mAddingChildren)
CaseChanged(aChild, PR_FALSE);
return NS_OK;
}
NS_IMETHODIMP
nsXFormsSwitchElement::WillRemoveChild(PRUint32 aIndex)
{
if (!mAddingChildren) {
nsCOMPtr<nsIDOMNodeList> list;
mElement->GetChildNodes(getter_AddRefs(list));
if (list) {
nsCOMPtr<nsIDOMNode> child;
list->Item(aIndex, getter_AddRefs(child));
CaseChanged(child, PR_TRUE);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsXFormsSwitchElement::BeginAddingChildren()
{
mAddingChildren = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
nsXFormsSwitchElement::DoneAddingChildren()
{
if (!mElement)
return NS_OK;
Init();
mAddingChildren = PR_FALSE;
return NS_OK;
}
// nsXFormsSwitchElement
void
nsXFormsSwitchElement::Init(nsIDOMElement* aDeselected)
{
nsCOMPtr<nsIDOMElement> firstCase = FindFirstSelectedCase(aDeselected);
mSelected = firstCase;
nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
if (selected) {
nsresult rv = selected->SetSelected(PR_TRUE);
// it is ok to fail if Init is called during the initialization phase since
// XBL might not have attached on the xf:case, yet.
// nsXFormsCaseElement::SetSelected will fail if it cannot QI the case
// element to nsIXFormsCaseElementUI.
NS_WARN_IF_FALSE(mAddingChildren || NS_SUCCEEDED(rv),
"Failed to select case");
}
}
already_AddRefed<nsIDOMElement>
nsXFormsSwitchElement::FindFirstSelectedCase(nsIDOMElement* aDeselected)
{
nsCOMPtr<nsIDOMNode> child;
mElement->GetFirstChild(getter_AddRefs(child));
nsCOMPtr<nsIDOMElement> firstCase;
while (child) {
nsCOMPtr<nsIDOMElement> childElement(do_QueryInterface(child));
if (childElement && childElement != aDeselected) {
if (nsXFormsUtils::IsXFormsElement(child, NS_LITERAL_STRING("case"))) {
if (!firstCase)
firstCase = childElement;
nsCOMPtr<nsIXFormsCaseElement> caseElem(do_QueryInterface(child));
if (caseElem) {
PRBool selected;
caseElem->GetInitialSelectedState(&selected);
if (selected) {
firstCase = childElement;
break;
}
}
}
}
nsCOMPtr<nsIDOMNode> tmp;
child->GetNextSibling(getter_AddRefs(tmp));
child.swap(tmp);
}
nsIDOMElement* result;
NS_IF_ADDREF(result = firstCase);
return result;
}
// nsIXFormsSwitchElement
NS_IMETHODIMP
nsXFormsSwitchElement::GetSelected(nsIDOMElement **aCase)
{
NS_ENSURE_ARG_POINTER(aCase);
NS_IF_ADDREF(*aCase = mSelected);
return NS_OK;
}
NS_IMETHODIMP
nsXFormsSwitchElement::SetSelected(nsIDOMElement *aCase, PRBool aValue)
{
if (!mElement)
return NS_OK;
// There is no need to change the selected case, If we are trying to select
// a case which is already selected or if deselecting a case,
// which is not selected.
if (mSelected &&
(((mSelected == aCase) && aValue) || ((mSelected != aCase) && !aValue)))
return NS_OK;
// Swapping the status of the mSelected and aCase, dispatching events.
if (aValue && mSelected) {
nsCOMPtr<nsIDOMElement> oldSel = mSelected;
mSelected = aCase;
nsCOMPtr<nsIXFormsCaseElement> deselected(do_QueryInterface(oldSel));
if (deselected)
deselected->SetSelected(PR_FALSE);
nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
if (selected)
selected->SetSelected(PR_TRUE);
SetFocus(oldSel, mSelected);
nsXFormsUtils::DispatchEvent(oldSel, eEvent_Deselect);
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
return NS_OK;
}
nsCOMPtr<nsIDOMElement> firstCase =
FindFirstSelectedCase(aValue ? nsnull : aCase);
// If a selectable case was found, bring it to front, set focus
// and dispatch events.
if (firstCase) {
mSelected = firstCase;
nsCOMPtr<nsIXFormsCaseElement> deselected(do_QueryInterface(aCase));
if (deselected)
deselected->SetSelected(PR_FALSE);
nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
if (selected)
selected->SetSelected(PR_TRUE);
SetFocus(aCase, mSelected);
nsXFormsUtils::DispatchEvent(aCase, eEvent_Deselect);
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
}
// If there is only one case, we (re)select it. No need to
// set focus.
else {
mSelected = aCase;
nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
if (selected)
selected->SetSelected(PR_TRUE);
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Deselect);
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
}
return NS_OK;
}
// nsXFormsSwitchElement
void
nsXFormsSwitchElement::SetFocus(nsIDOMElement* aDeselected,
nsIDOMElement* aSelected)
{
if (aDeselected == aSelected)
return;
nsCOMPtr<nsIDOMDocument> domDoc;
mElement->GetOwnerDocument(getter_AddRefs(domDoc));
nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
if (!doc)
return;
nsCOMPtr<nsPIDOMWindow> win = doc->GetWindow();
if (!win)
return;
nsIFocusController *focusController = win->GetRootFocusController();
if (!focusController)
return;
nsCOMPtr<nsIDOMElement> focused;
focusController->GetFocusedElement(getter_AddRefs(focused));
if (!focused)
return;
PRBool hasFocus = PR_FALSE;
nsCOMPtr<nsIDOMNode> current(do_QueryInterface(focused));
do {
nsCOMPtr<nsIDOMElement> currentElement(do_QueryInterface(current));
if (aDeselected == current) {
hasFocus = PR_TRUE;
break;
}
nsCOMPtr<nsIDOMNode> parent;
current->GetParentNode(getter_AddRefs(parent));
current.swap(parent);
} while(current);
if (hasFocus) {
// Flush layout before moving focus. Otherwise focus controller might
// (re)focus something in the deselected <case>.
doc->FlushPendingNotifications(Flush_Layout);
focusController->MoveFocus(PR_TRUE, mElement);
}
}
void
nsXFormsSwitchElement::CaseChanged(nsIDOMNode* aCase, PRBool aRemoved)
{
if (!aCase)
return;
if (aRemoved) {
if (aCase == mSelected) {
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Deselect);
nsCOMPtr<nsIDOMElement> el(do_QueryInterface(aCase));
Init(el);
if (mSelected)
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
}
return;
}
nsCOMPtr<nsIDOMElement> element(do_QueryInterface(aCase));
if (!element)
return;
if (!mSelected) {
Init();
if (mSelected)
nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
return;
}
if (!nsXFormsUtils::IsXFormsElement(aCase, NS_LITERAL_STRING("case")))
return;
nsCOMPtr<nsIXFormsCaseElement> caseElem(do_QueryInterface(element));
if (caseElem) {
PRBool selected;
caseElem->GetInitialSelectedState(&selected);
if (selected) {
SetSelected(element, PR_TRUE);
}
}
}
// nsIXFormsControl
NS_IMETHODIMP
nsXFormsSwitchElement::IsEventTarget(PRBool *aOK)
{
*aOK = PR_FALSE;
return NS_OK;
}
NS_HIDDEN_(nsresult)
NS_NewXFormsSwitchElement(nsIXTFElement **aResult)
{
*aResult = new nsXFormsSwitchElement();
if (!*aResult)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aResult);
return NS_OK;
}