gecko-dev/layout/forms/nsSelectsAreaFrame.cpp

134 lines
4.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsSelectsAreaFrame.h"
#include "nsCOMPtr.h"
#include "nsIDOMHTMLOptionElement.h"
#include "nsIContent.h"
#include "nsIStyleContext.h"
nsresult
NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsIFrame** aNewFrame, PRUint32 aFlags)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsSelectsAreaFrame* it = new (aShell) nsSelectsAreaFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
it->SetFlags(aFlags);
*aNewFrame = it;
return NS_OK;
}
/*NS_IMETHODIMP
nsSelectsAreaFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kAreaFrameIID)) {
nsIAreaFrame* tmp = (nsIAreaFrame*)this;
*aInstancePtr = (void*)tmp;
return NS_OK;
}
return nsAreaFrame::QueryInterface(aIID, aInstancePtr);
}
*/
//---------------------------------------------------------
PRBool
nsSelectsAreaFrame::IsOptionElement(nsIContent* aContent)
{
PRBool result = PR_FALSE;
nsCOMPtr<nsIDOMHTMLOptionElement> optElem;
if (NS_SUCCEEDED(aContent->QueryInterface(NS_GET_IID(nsIDOMHTMLOptionElement),(void**) getter_AddRefs(optElem)))) {
if (optElem != nsnull) {
result = PR_TRUE;
}
}
return result;
}
//---------------------------------------------------------
PRBool
nsSelectsAreaFrame::IsOptionElementFrame(nsIFrame *aFrame)
{
nsIContent *content = nsnull;
aFrame->GetContent(&content);
PRBool result = PR_FALSE;
if (nsnull != content) {
result = IsOptionElement(content);
NS_RELEASE(content);
}
return(result);
}
//---------------------------------------------------------
NS_IMETHODIMP
nsSelectsAreaFrame::GetFrameForPoint(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsFramePaintLayer aWhichLayer,
nsIFrame** aFrame)
{
PRBool inThisFrame = mRect.Contains(aPoint);
if (!((mState & NS_FRAME_OUTSIDE_CHILDREN) || inThisFrame )) {
return NS_ERROR_FAILURE;
}
nsresult result = nsAreaFrame::GetFrameForPoint(aPresContext, aPoint, aWhichLayer, aFrame);
if (result == NS_OK) {
nsIFrame* selectedFrame = *aFrame;
while ((nsnull != selectedFrame) && (PR_FALSE == IsOptionElementFrame(selectedFrame))) {
selectedFrame->GetParent(&selectedFrame);
}
if (nsnull != selectedFrame) {
*aFrame = selectedFrame;
}
// else, keep the original result as *aFrame, which could be this frame
}
return result;
}