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
   8 #include "gfx2DGlue.h"
   9 #include "gfxUtils.h"
  10 #include "mozilla/gfx/2D.h"
  11 #include "mozilla/gfx/PathHelpers.h"
  12 #include "nsLayoutUtils.h"
  13 #include "nsRenderingContext.h"
  14 #include "nsDisplayList.h"
  15
  16 using namespace mozilla;
  17 using namespace mozilla::gfx;
  18
  19 nsIFrame*
  20 NS_NewGfxRadioControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  21 {
  22   return new (aPresShell) nsGfxRadioControlFrame(aContext);
  23 }
  24
  25 NS_IMPL_FRAMEARENA_HELPERS(nsGfxRadioControlFrame)
  26
  27 nsGfxRadioControlFrame::nsGfxRadioControlFrame(nsStyleContext* aContext):
  28   nsFormControlFrame(aContext)
  29 {
  30 }
  31
  32 nsGfxRadioControlFrame::~nsGfxRadioControlFrame()
  33 {
  34 }
  35
  36 #ifdef ACCESSIBILITY
  37 a11y::AccType
  38 nsGfxRadioControlFrame::AccessibleType()
  39 {
  40   return a11y::eHTMLRadioButtonType;
  41 }
  42 #endif
  43
  44 //--------------------------------------------------------------
  45 // Draw the dot for a non-native radio button in the checked state.
  46 static void
  47 PaintCheckedRadioButton(nsIFrame* aFrame,
  48                         nsRenderingContext* aCtx,
  49                         const nsRect& aDirtyRect,
  50                         nsPoint aPt)
  51 {
  52   // The dot is an ellipse 2px on all sides smaller than the content-box,
  53   // drawn in the foreground color.
  54   nsRect rect(aPt, aFrame->GetSize());
  55   rect.Deflate(aFrame->GetUsedBorderAndPadding());
  56   rect.Deflate(nsPresContext::CSSPixelsToAppUnits(2),
  57                nsPresContext::CSSPixelsToAppUnits(2));
  58
  59   Rect devPxRect =
  60     ToRect(nsLayoutUtils::RectToGfxRect(rect,
  61                                         aFrame->PresContext()->AppUnitsPerDevPixel()));
  62
  63   ColorPattern color(ToDeviceColor(aFrame->StyleColor()->mColor));
  64
  65   DrawTarget* drawTarget = aCtx->GetDrawTarget();
  66   RefPtr<PathBuilder> builder = drawTarget->CreatePathBuilder();
  67   AppendEllipseToPath(builder, devPxRect.Center(), devPxRect.Size());
  68   RefPtr<Path> ellipse = builder->Finish();
  69   drawTarget->Fill(ellipse, color);
  70 }
  71
  72 void
  73 nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  74                                          const nsRect&           aDirtyRect,
  75                                          const nsDisplayListSet& aLists)
  76 {
  77   nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
  78
  79   if (!IsVisibleForPainting(aBuilder))
  80     return;
  81
  82   if (IsThemed())
  83     return; // The theme will paint the check, if any.
  84
  85   bool checked = true;
  86   GetCurrentCheckState(&checked); // Get check state from the content model
  87   if (!checked)
  88     return;
  89
  90   aLists.Content()->AppendNewToTop(new (aBuilder)
  91     nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
  92                      "CheckedRadioButton",
  93                      nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
  94 }