layout/forms/nsGfxRadioControlFrame.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsGfxRadioControlFrame.h"
   7 #include "nsIContent.h"
   8 #include "nsCOMPtr.h"
   9 #include "nsCSSRendering.h"
  10 #include "nsRenderingContext.h"
  11 #include "nsIServiceManager.h"
  12 #include "nsITheme.h"
  13 #include "nsDisplayList.h"
  14 #include "nsCSSAnonBoxes.h"
  15
  16 using namespace mozilla;
  17
  18 nsIFrame*
  19 NS_NewGfxRadioControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  20 {
  21   return new (aPresShell) nsGfxRadioControlFrame(aContext);
  22 }
  23
  24 NS_IMPL_FRAMEARENA_HELPERS(nsGfxRadioControlFrame)
  25
  26 nsGfxRadioControlFrame::nsGfxRadioControlFrame(nsStyleContext* aContext):
  27   nsFormControlFrame(aContext)
  28 {
  29 }
  30
  31 nsGfxRadioControlFrame::~nsGfxRadioControlFrame()
  32 {
  33 }
  34
  35 #ifdef ACCESSIBILITY
  36 a11y::AccType
  37 nsGfxRadioControlFrame::AccessibleType()
  38 {
  39   return a11y::eHTMLRadioButtonType;
  40 }
  41 #endif
  42
  43 //--------------------------------------------------------------
  44 // Draw the dot for a non-native radio button in the checked state.
  45 static void
  46 PaintCheckedRadioButton(nsIFrame* aFrame,
  47                         nsRenderingContext* aCtx,
  48                         const nsRect& aDirtyRect,
  49                         nsPoint aPt)
  50 {
  51   // The dot is an ellipse 2px on all sides smaller than the content-box,
  52   // drawn in the foreground color.
  53   nsRect rect(aPt, aFrame->GetSize());
  54   rect.Deflate(aFrame->GetUsedBorderAndPadding());
  55   rect.Deflate(nsPresContext::CSSPixelsToAppUnits(2),
  56                nsPresContext::CSSPixelsToAppUnits(2));
  57
  58   aCtx->SetColor(aFrame->StyleColor()->mColor);
  59   aCtx->FillEllipse(rect);
  60 }
  61
  62 void
  63 nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  64                                          const nsRect&           aDirtyRect,
  65                                          const nsDisplayListSet& aLists)
  66 {
  67   nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
  68
  69   if (!IsVisibleForPainting(aBuilder))
  70     return;
  71
  72   if (IsThemed())
  73     return; // The theme will paint the check, if any.
  74
  75   bool checked = true;
  76   GetCurrentCheckState(&checked); // Get check state from the content model
  77   if (!checked)
  78     return;
  79
  80   aLists.Content()->AppendNewToTop(new (aBuilder)
  81     nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
  82                      "CheckedRadioButton",
  83                      nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
  84 }