layout/forms/nsGfxRadioControlFrame.cpp

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  37
  38 #include "nsGfxRadioControlFrame.h"
  39 #include "nsIContent.h"
  40 #include "nsCOMPtr.h"
  41 #include "nsCSSRendering.h"
  42 #ifdef ACCESSIBILITY
  43 #include "nsAccessibilityService.h"
  44 #endif
  45 #include "nsIServiceManager.h"
  46 #include "nsITheme.h"
  47 #include "nsDisplayList.h"
  48 #include "nsCSSAnonBoxes.h"
  49
  50 nsIFrame*
  51 NS_NewGfxRadioControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  52 {
  53   return new (aPresShell) nsGfxRadioControlFrame(aContext);
  54 }
  55
  56 NS_IMPL_FRAMEARENA_HELPERS(nsGfxRadioControlFrame)
  57
  58 nsGfxRadioControlFrame::nsGfxRadioControlFrame(nsStyleContext* aContext):
  59   nsFormControlFrame(aContext)
  60 {
  61 }
  62
  63 nsGfxRadioControlFrame::~nsGfxRadioControlFrame()
  64 {
  65 }
  66
  67 #ifdef ACCESSIBILITY
  68 already_AddRefed<nsAccessible>
  69 nsGfxRadioControlFrame::CreateAccessible()
  70 {
  71   nsAccessibilityService* accService = nsIPresShell::AccService();
  72   if (accService) {
  73     return accService->CreateHTMLRadioButtonAccessible(mContent,
  74                                                        PresContext()->PresShell());
  75   }
  76
  77   return nsnull;
  78 }
  79 #endif
  80
  81 //--------------------------------------------------------------
  82 // Draw the dot for a non-native radio button in the checked state.
  83 static void
  84 PaintCheckedRadioButton(nsIFrame* aFrame,
  85                         nsIRenderingContext* aCtx,
  86                         const nsRect& aDirtyRect,
  87                         nsPoint aPt)
  88 {
  89   // The dot is an ellipse 2px on all sides smaller than the content-box,
  90   // drawn in the foreground color.
  91   nsRect rect(aPt, aFrame->GetSize());
  92   rect.Deflate(aFrame->GetUsedBorderAndPadding());
  93   rect.Deflate(nsPresContext::CSSPixelsToAppUnits(2),
  94                nsPresContext::CSSPixelsToAppUnits(2));
  95
  96   aCtx->SetColor(aFrame->GetStyleColor()->mColor);
  97   aCtx->FillEllipse(rect);
  98 }
  99
 100 NS_IMETHODIMP
 101 nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
 102                                          const nsRect&           aDirtyRect,
 103                                          const nsDisplayListSet& aLists)
 104 {
 105   nsresult rv = nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect,
 106                                                      aLists);
 107   NS_ENSURE_SUCCESS(rv, rv);
 108
 109   if (!IsVisibleForPainting(aBuilder))
 110     return NS_OK;
 111
 112   if (IsThemed())
 113     return NS_OK; // The theme will paint the check, if any.
 114
 115   PRBool checked = PR_TRUE;
 116   GetCurrentCheckState(&checked); // Get check state from the content model
 117   if (!checked)
 118     return NS_OK;
 119
 120   return aLists.Content()->AppendNewToTop(new (aBuilder)
 121     nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
 122                      "CheckedRadioButton",
 123                      nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
 124 }