mirror of
https://github.com/rn10950/RetroZilla.git
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419 lines
12 KiB
C++
419 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla XForms support.
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*
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* The Initial Developer of the Original Code is
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* Olli Pettay.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Olli Pettay <Olli.Pettay@helsinki.fi> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMDocument.h"
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#include "nsString.h"
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#include "nsIDocument.h"
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#include "nsIDOMNodeList.h"
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// For focus control
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#include "nsPIDOMWindow.h"
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#include "nsIFocusController.h"
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#include "nsXFormsUtils.h"
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#include "nsXFormsControlStub.h"
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#include "nsIModelElementPrivate.h"
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#include "nsIXFormsSwitchElement.h"
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#include "nsIXFormsCaseElement.h"
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#include "nsXFormsDelegateStub.h"
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/**
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* Implementation of the XForms \<switch\> element.
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*
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* @see http://www.w3.org/TR/xforms/slice9.html#id2631571
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*/
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class nsXFormsSwitchElement : public nsIXFormsSwitchElement,
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public nsXFormsDelegateStub
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{
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public:
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nsXFormsSwitchElement() : mAddingChildren(PR_FALSE) {}
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIXFORMSSWITCHELEMENT
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NS_IMETHOD OnCreated(nsIXTFBindableElementWrapper *aWrapper);
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NS_IMETHOD ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex);
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NS_IMETHOD ChildAppended(nsIDOMNode *aChild);
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NS_IMETHOD WillRemoveChild(PRUint32 aIndex);
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NS_IMETHOD BeginAddingChildren();
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NS_IMETHOD DoneAddingChildren();
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// nsIXFormsControl
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NS_IMETHOD IsEventTarget(PRBool *aOK);
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#ifdef DEBUG_smaug
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virtual const char* Name() { return "switch"; }
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#endif
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private:
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/**
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* http://www.w3.org/TR/xforms/slice9.html#ui-case
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* "If multiple cases within a switch are marked as
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* selected="true", the first selected case remains and all
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* others are deselected. If none are selected, the first becomes selected."
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*
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* This method returns the first selected case.
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*/
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already_AddRefed<nsIDOMElement>
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FindFirstSelectedCase(nsIDOMElement* aDeselected = nsnull);
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void Init(nsIDOMElement* aDeselected = nsnull);
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/**
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* This is called when a case is added or removed dynamically.
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*/
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void CaseChanged(nsIDOMNode* aCase, PRBool aRemoved);
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/**
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* Checks if any element in aDeselected has focus and if yes
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* tries to focus first focusable element in aSelected.
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*/
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void SetFocus(nsIDOMElement* aDeselected, nsIDOMElement* aSelected);
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nsCOMPtr<nsIDOMElement> mSelected;
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PRBool mAddingChildren;
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};
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NS_IMPL_ISUPPORTS_INHERITED1(nsXFormsSwitchElement,
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nsXFormsDelegateStub,
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nsIXFormsSwitchElement)
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NS_IMETHODIMP
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nsXFormsSwitchElement::OnCreated(nsIXTFBindableElementWrapper *aWrapper)
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{
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nsresult rv = nsXFormsDelegateStub::OnCreated(aWrapper);
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NS_ENSURE_SUCCESS(rv, rv);
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aWrapper->SetNotificationMask(kStandardNotificationMask |
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nsIXTFElement::NOTIFY_BEGIN_ADDING_CHILDREN |
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nsIXTFElement::NOTIFY_DONE_ADDING_CHILDREN |
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nsIXTFElement::NOTIFY_CHILD_APPENDED |
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nsIXTFElement::NOTIFY_CHILD_INSERTED |
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nsIXTFElement::NOTIFY_WILL_REMOVE_CHILD);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsSwitchElement::ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex)
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{
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if (!mAddingChildren)
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CaseChanged(aChild, PR_FALSE);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsSwitchElement::ChildAppended(nsIDOMNode *aChild)
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{
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if (!mAddingChildren)
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CaseChanged(aChild, PR_FALSE);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsSwitchElement::WillRemoveChild(PRUint32 aIndex)
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{
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if (!mAddingChildren) {
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nsCOMPtr<nsIDOMNodeList> list;
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mElement->GetChildNodes(getter_AddRefs(list));
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if (list) {
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nsCOMPtr<nsIDOMNode> child;
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list->Item(aIndex, getter_AddRefs(child));
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CaseChanged(child, PR_TRUE);
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsSwitchElement::BeginAddingChildren()
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{
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mAddingChildren = PR_TRUE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsSwitchElement::DoneAddingChildren()
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{
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if (!mElement)
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return NS_OK;
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Init();
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mAddingChildren = PR_FALSE;
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return NS_OK;
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}
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// nsXFormsSwitchElement
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void
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nsXFormsSwitchElement::Init(nsIDOMElement* aDeselected)
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{
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nsCOMPtr<nsIDOMElement> firstCase = FindFirstSelectedCase(aDeselected);
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mSelected = firstCase;
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nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
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if (selected) {
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nsresult rv = selected->SetSelected(PR_TRUE);
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// it is ok to fail if Init is called during the initialization phase since
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// XBL might not have attached on the xf:case, yet.
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// nsXFormsCaseElement::SetSelected will fail if it cannot QI the case
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// element to nsIXFormsCaseElementUI.
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NS_WARN_IF_FALSE(mAddingChildren || NS_SUCCEEDED(rv),
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"Failed to select case");
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}
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}
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already_AddRefed<nsIDOMElement>
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nsXFormsSwitchElement::FindFirstSelectedCase(nsIDOMElement* aDeselected)
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{
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nsCOMPtr<nsIDOMNode> child;
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mElement->GetFirstChild(getter_AddRefs(child));
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nsCOMPtr<nsIDOMElement> firstCase;
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while (child) {
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nsCOMPtr<nsIDOMElement> childElement(do_QueryInterface(child));
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if (childElement && childElement != aDeselected) {
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if (nsXFormsUtils::IsXFormsElement(child, NS_LITERAL_STRING("case"))) {
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if (!firstCase)
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firstCase = childElement;
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nsCOMPtr<nsIXFormsCaseElement> caseElem(do_QueryInterface(child));
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if (caseElem) {
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PRBool selected;
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caseElem->GetInitialSelectedState(&selected);
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if (selected) {
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firstCase = childElement;
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break;
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}
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}
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}
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}
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nsCOMPtr<nsIDOMNode> tmp;
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child->GetNextSibling(getter_AddRefs(tmp));
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child.swap(tmp);
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}
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nsIDOMElement* result;
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NS_IF_ADDREF(result = firstCase);
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return result;
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}
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// nsIXFormsSwitchElement
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NS_IMETHODIMP
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nsXFormsSwitchElement::GetSelected(nsIDOMElement **aCase)
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{
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NS_ENSURE_ARG_POINTER(aCase);
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NS_IF_ADDREF(*aCase = mSelected);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsSwitchElement::SetSelected(nsIDOMElement *aCase, PRBool aValue)
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{
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if (!mElement)
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return NS_OK;
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// There is no need to change the selected case, If we are trying to select
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// a case which is already selected or if deselecting a case,
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// which is not selected.
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if (mSelected &&
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(((mSelected == aCase) && aValue) || ((mSelected != aCase) && !aValue)))
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return NS_OK;
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// Swapping the status of the mSelected and aCase, dispatching events.
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if (aValue && mSelected) {
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nsCOMPtr<nsIDOMElement> oldSel = mSelected;
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mSelected = aCase;
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nsCOMPtr<nsIXFormsCaseElement> deselected(do_QueryInterface(oldSel));
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if (deselected)
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deselected->SetSelected(PR_FALSE);
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nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
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if (selected)
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selected->SetSelected(PR_TRUE);
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SetFocus(oldSel, mSelected);
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nsXFormsUtils::DispatchEvent(oldSel, eEvent_Deselect);
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
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return NS_OK;
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}
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nsCOMPtr<nsIDOMElement> firstCase =
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FindFirstSelectedCase(aValue ? nsnull : aCase);
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// If a selectable case was found, bring it to front, set focus
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// and dispatch events.
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if (firstCase) {
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mSelected = firstCase;
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nsCOMPtr<nsIXFormsCaseElement> deselected(do_QueryInterface(aCase));
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if (deselected)
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deselected->SetSelected(PR_FALSE);
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nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
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if (selected)
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selected->SetSelected(PR_TRUE);
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SetFocus(aCase, mSelected);
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nsXFormsUtils::DispatchEvent(aCase, eEvent_Deselect);
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
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}
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// If there is only one case, we (re)select it. No need to
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// set focus.
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else {
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mSelected = aCase;
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nsCOMPtr<nsIXFormsCaseElement> selected(do_QueryInterface(mSelected));
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if (selected)
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selected->SetSelected(PR_TRUE);
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Deselect);
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
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}
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return NS_OK;
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}
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// nsXFormsSwitchElement
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void
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nsXFormsSwitchElement::SetFocus(nsIDOMElement* aDeselected,
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nsIDOMElement* aSelected)
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{
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if (aDeselected == aSelected)
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return;
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nsCOMPtr<nsIDOMDocument> domDoc;
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mElement->GetOwnerDocument(getter_AddRefs(domDoc));
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nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
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if (!doc)
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return;
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nsCOMPtr<nsPIDOMWindow> win = doc->GetWindow();
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if (!win)
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return;
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nsIFocusController *focusController = win->GetRootFocusController();
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if (!focusController)
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return;
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nsCOMPtr<nsIDOMElement> focused;
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focusController->GetFocusedElement(getter_AddRefs(focused));
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if (!focused)
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return;
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PRBool hasFocus = PR_FALSE;
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nsCOMPtr<nsIDOMNode> current(do_QueryInterface(focused));
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do {
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nsCOMPtr<nsIDOMElement> currentElement(do_QueryInterface(current));
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if (aDeselected == current) {
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hasFocus = PR_TRUE;
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break;
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}
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nsCOMPtr<nsIDOMNode> parent;
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current->GetParentNode(getter_AddRefs(parent));
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current.swap(parent);
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} while(current);
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if (hasFocus) {
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// Flush layout before moving focus. Otherwise focus controller might
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// (re)focus something in the deselected <case>.
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doc->FlushPendingNotifications(Flush_Layout);
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focusController->MoveFocus(PR_TRUE, mElement);
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}
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}
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void
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nsXFormsSwitchElement::CaseChanged(nsIDOMNode* aCase, PRBool aRemoved)
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{
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if (!aCase)
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return;
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if (aRemoved) {
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if (aCase == mSelected) {
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Deselect);
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nsCOMPtr<nsIDOMElement> el(do_QueryInterface(aCase));
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Init(el);
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if (mSelected)
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
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}
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return;
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}
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nsCOMPtr<nsIDOMElement> element(do_QueryInterface(aCase));
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if (!element)
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return;
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if (!mSelected) {
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Init();
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if (mSelected)
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nsXFormsUtils::DispatchEvent(mSelected, eEvent_Select);
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return;
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}
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if (!nsXFormsUtils::IsXFormsElement(aCase, NS_LITERAL_STRING("case")))
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return;
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nsCOMPtr<nsIXFormsCaseElement> caseElem(do_QueryInterface(element));
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if (caseElem) {
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PRBool selected;
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caseElem->GetInitialSelectedState(&selected);
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if (selected) {
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SetSelected(element, PR_TRUE);
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}
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}
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}
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// nsIXFormsControl
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NS_IMETHODIMP
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nsXFormsSwitchElement::IsEventTarget(PRBool *aOK)
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{
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*aOK = PR_FALSE;
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return NS_OK;
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}
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NS_HIDDEN_(nsresult)
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NS_NewXFormsSwitchElement(nsIXTFElement **aResult)
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{
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*aResult = new nsXFormsSwitchElement();
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if (!*aResult)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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