gecko/layout/forms/nsGfxRadioControlFrame.cpp

/* -*- 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.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):
 *
 * 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 "nsGfxRadioControlFrame.h"
#include "nsIContent.h"
#include "nsCOMPtr.h"
#include "nsCSSRendering.h"
#include "nsRenderingContext.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
#include "nsIServiceManager.h"
#include "nsITheme.h"
#include "nsDisplayList.h"
#include "nsCSSAnonBoxes.h"

nsIFrame*
NS_NewGfxRadioControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsGfxRadioControlFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsGfxRadioControlFrame)

nsGfxRadioControlFrame::nsGfxRadioControlFrame(nsStyleContext* aContext):
  nsFormControlFrame(aContext)
{
}

nsGfxRadioControlFrame::~nsGfxRadioControlFrame()
{
}

#ifdef ACCESSIBILITY
already_AddRefed<nsAccessible>
nsGfxRadioControlFrame::CreateAccessible()
{
  nsAccessibilityService* accService = nsIPresShell::AccService();
  if (accService) {
    return accService->CreateHTMLRadioButtonAccessible(mContent,
                                                       PresContext()->PresShell());
  }

  return nsnull;
}
#endif

//--------------------------------------------------------------
// Draw the dot for a non-native radio button in the checked state.
static void
PaintCheckedRadioButton(nsIFrame* aFrame,
                        nsRenderingContext* aCtx,
                        const nsRect& aDirtyRect,
                        nsPoint aPt)
{
  // The dot is an ellipse 2px on all sides smaller than the content-box,
  // drawn in the foreground color.
  nsRect rect(aPt, aFrame->GetSize());
  rect.Deflate(aFrame->GetUsedBorderAndPadding());
  rect.Deflate(nsPresContext::CSSPixelsToAppUnits(2),
               nsPresContext::CSSPixelsToAppUnits(2));

  aCtx->SetColor(aFrame->GetStyleColor()->mColor);
  aCtx->FillEllipse(rect);
}

NS_IMETHODIMP
nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                         const nsRect&           aDirtyRect,
                                         const nsDisplayListSet& aLists)
{
  nsresult rv = nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect,
                                                     aLists);
  NS_ENSURE_SUCCESS(rv, rv);
  
  if (!IsVisibleForPainting(aBuilder))
    return NS_OK;
  
  if (IsThemed())
    return NS_OK; // The theme will paint the check, if any.

  PRBool checked = PR_TRUE;
  GetCurrentCheckState(&checked); // Get check state from the content model
  if (!checked)
    return NS_OK;
    
  return aLists.Content()->AppendNewToTop(new (aBuilder)
    nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
                     "CheckedRadioButton",
                     nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
}