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 "nsRenderingContext.h"
   8 #include "nsDisplayList.h"
   9
  10 using namespace mozilla;
  11
  12 nsIFrame*
  13 NS_NewGfxRadioControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  14 {
  15   return new (aPresShell) nsGfxRadioControlFrame(aContext);
  16 }
  17
  18 NS_IMPL_FRAMEARENA_HELPERS(nsGfxRadioControlFrame)
  19
  20 nsGfxRadioControlFrame::nsGfxRadioControlFrame(nsStyleContext* aContext):
  21   nsFormControlFrame(aContext)
  22 {
  23 }
  24
  25 nsGfxRadioControlFrame::~nsGfxRadioControlFrame()
  26 {
  27 }
  28
  29 #ifdef ACCESSIBILITY
  30 a11y::AccType
  31 nsGfxRadioControlFrame::AccessibleType()
  32 {
  33   return a11y::eHTMLRadioButtonType;
  34 }
  35 #endif
  36
  37 //--------------------------------------------------------------
  38 // Draw the dot for a non-native radio button in the checked state.
  39 static void
  40 PaintCheckedRadioButton(nsIFrame* aFrame,
  41                         nsRenderingContext* aCtx,
  42                         const nsRect& aDirtyRect,
  43                         nsPoint aPt)
  44 {
  45   // The dot is an ellipse 2px on all sides smaller than the content-box,
  46   // drawn in the foreground color.
  47   nsRect rect(aPt, aFrame->GetSize());
  48   rect.Deflate(aFrame->GetUsedBorderAndPadding());
  49   rect.Deflate(nsPresContext::CSSPixelsToAppUnits(2),
  50                nsPresContext::CSSPixelsToAppUnits(2));
  51
  52   aCtx->SetColor(aFrame->StyleColor()->mColor);
  53   aCtx->FillEllipse(rect);
  54 }
  55
  56 void
  57 nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  58                                          const nsRect&           aDirtyRect,
  59                                          const nsDisplayListSet& aLists)
  60 {
  61   nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
  62
  63   if (!IsVisibleForPainting(aBuilder))
  64     return;
  65
  66   if (IsThemed())
  67     return; // The theme will paint the check, if any.
  68
  69   bool checked = true;
  70   GetCurrentCheckState(&checked); // Get check state from the content model
  71   if (!checked)
  72     return;
  73
  74   aLists.Content()->AppendNewToTop(new (aBuilder)
  75     nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
  76                      "CheckedRadioButton",
  77                      nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
  78 }