gecko-dev/layout/forms/nsButtonFrameRenderer.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
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 *
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#include "nsButtonFrameRenderer.h"
#include "nsIRenderingContext.h"
#include "nsCSSRendering.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsCSSPseudoElements.h"
#include "nsINameSpaceManager.h"
#include "nsStyleSet.h"
#include "nsDisplayList.h"
#include "nsITheme.h"
#include "nsThemeConstants.h"

#define ACTIVE   "active"
#define HOVER    "hover"
#define FOCUS    "focus"

nsButtonFrameRenderer::nsButtonFrameRenderer()
{
  MOZ_COUNT_CTOR(nsButtonFrameRenderer);
}

nsButtonFrameRenderer::~nsButtonFrameRenderer()
{
  MOZ_COUNT_DTOR(nsButtonFrameRenderer);
}

void
nsButtonFrameRenderer::SetFrame(nsFrame* aFrame, nsPresContext* aPresContext)
{
  mFrame = aFrame;
  ReResolveStyles(aPresContext);
}

nsIFrame*
nsButtonFrameRenderer::GetFrame()
{
  return mFrame;
}

void
nsButtonFrameRenderer::SetDisabled(PRBool aDisabled, PRBool notify)
{
  if (aDisabled)
    mFrame->GetContent()->SetAttr(kNameSpaceID_None, nsGkAtoms::disabled, EmptyString(),
                                  notify);
  else
    mFrame->GetContent()->UnsetAttr(kNameSpaceID_None, nsGkAtoms::disabled, notify);
}

PRBool
nsButtonFrameRenderer::isDisabled() 
{
  // get the content
  return mFrame->GetContent()->HasAttr(kNameSpaceID_None,
                                       nsGkAtoms::disabled);
}

class nsDisplayButtonBorderBackground : public nsDisplayItem {
public:
  nsDisplayButtonBorderBackground(nsButtonFrameRenderer* aRenderer)
    : nsDisplayItem(aRenderer->GetFrame()), mBFR(aRenderer) {
    MOZ_COUNT_CTOR(nsDisplayButtonBorderBackground);
  }
#ifdef NS_BUILD_REFCNT_LOGGING
  virtual ~nsDisplayButtonBorderBackground() {
    MOZ_COUNT_DTOR(nsDisplayButtonBorderBackground);
  }
#endif  
  
  virtual nsIFrame* HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt,
                            HitTestState* aState) {
    return mFrame;
  }
  virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
     const nsRect& aDirtyRect);
  NS_DISPLAY_DECL_NAME("ButtonBorderBackground")
private:
  nsButtonFrameRenderer* mBFR;
};

class nsDisplayButtonForeground : public nsDisplayItem {
public:
  nsDisplayButtonForeground(nsButtonFrameRenderer* aRenderer)
    : nsDisplayItem(aRenderer->GetFrame()), mBFR(aRenderer) {
    MOZ_COUNT_CTOR(nsDisplayButtonForeground);
  }
#ifdef NS_BUILD_REFCNT_LOGGING
  virtual ~nsDisplayButtonForeground() {
    MOZ_COUNT_DTOR(nsDisplayButtonForeground);
  }
#endif  

  virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
     const nsRect& aDirtyRect);
  NS_DISPLAY_DECL_NAME("ButtonForeground")
private:
  nsButtonFrameRenderer* mBFR;
};

void nsDisplayButtonBorderBackground::Paint(nsDisplayListBuilder* aBuilder,
                                            nsIRenderingContext* aCtx,
                                            const nsRect& aDirtyRect)
{
  NS_ASSERTION(mFrame, "No frame?");
  nsPresContext* pc = mFrame->PresContext();
  nsRect r = nsRect(aBuilder->ToReferenceFrame(mFrame), mFrame->GetSize());
  
  // draw the border and background inside the focus and outline borders
  mBFR->PaintBorderAndBackground(pc, *aCtx, aDirtyRect, r);
}

void nsDisplayButtonForeground::Paint(nsDisplayListBuilder* aBuilder,
                                      nsIRenderingContext* aCtx,
                                      const nsRect& aDirtyRect)
{
  nsPresContext *presContext = mFrame->PresContext();
  const nsStyleDisplay *disp = mFrame->GetStyleDisplay();
  if (!mFrame->IsThemed(disp) ||
      !presContext->GetTheme()->ThemeDrawsFocusForWidget(presContext, mFrame, disp->mAppearance)) {
    // draw the focus and outline borders
    nsRect r = nsRect(aBuilder->ToReferenceFrame(mFrame), mFrame->GetSize());
    mBFR->PaintOutlineAndFocusBorders(presContext, *aCtx, aDirtyRect, r);
  }
}

nsresult
nsButtonFrameRenderer::DisplayButton(nsDisplayListBuilder* aBuilder,
                                     nsDisplayList* aBackground,
                                     nsDisplayList* aForeground)
{
  nsresult rv = aBackground->AppendNewToTop(new (aBuilder)
      nsDisplayButtonBorderBackground(this));
  NS_ENSURE_SUCCESS(rv, rv);

  return aForeground->AppendNewToTop(new (aBuilder)
      nsDisplayButtonForeground(this));
}

void
nsButtonFrameRenderer::PaintOutlineAndFocusBorders(nsPresContext* aPresContext,
          nsIRenderingContext& aRenderingContext,
          const nsRect& aDirtyRect,
          const nsRect& aRect)
{
  // once we have all that we'll draw the focus if we have it. We will need to draw 2 focuses,
  // the inner and the outer. This is so we can do any kind of look and feel some buttons have
  // focus on the outside like mac and motif. While others like windows have it inside (dotted line).
  // Usually only one will be specifed. But I guess you could have both if you wanted to.

  nsRect rect;

  if (mOuterFocusStyle) {
    // ---------- paint the outer focus border -------------

    GetButtonOuterFocusRect(aRect, rect);

    const nsStyleBorder* border = mOuterFocusStyle->GetStyleBorder();
    nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, mFrame,
                                aDirtyRect, rect, *border, mOuterFocusStyle, 0);
  }

  if (mInnerFocusStyle) { 
    // ---------- paint the inner focus border -------------

    GetButtonInnerFocusRect(aRect, rect);

    const nsStyleBorder* border = mInnerFocusStyle->GetStyleBorder();
    nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, mFrame,
                                aDirtyRect, rect, *border, mInnerFocusStyle, 0);
  }
}


void
nsButtonFrameRenderer::PaintBorderAndBackground(nsPresContext* aPresContext,
          nsIRenderingContext& aRenderingContext,
          const nsRect& aDirtyRect,
          const nsRect& aRect)

{
  // get the button rect this is inside the focus and outline rects
  nsRect buttonRect;
  GetButtonRect(aRect, buttonRect);

  nsStyleContext* context = mFrame->GetStyleContext();

  const nsStyleBorder* border = context->GetStyleBorder();
  const nsStylePadding* padding = context->GetStylePadding();

  nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, mFrame,
                                  aDirtyRect, buttonRect, *border, *padding,
                                  PR_FALSE);
  nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, mFrame,
                              aDirtyRect, buttonRect, *border, context, 0);
}


void
nsButtonFrameRenderer::GetButtonOuterFocusRect(const nsRect& aRect, nsRect& focusRect)
{
  focusRect = aRect;
}

void
nsButtonFrameRenderer::GetButtonRect(const nsRect& aRect, nsRect& r)
{
  r = aRect;
  r.Deflate(GetButtonOuterFocusBorderAndPadding());
}


void
nsButtonFrameRenderer::GetButtonInnerFocusRect(const nsRect& aRect, nsRect& focusRect)
{
  GetButtonRect(aRect, focusRect);
  focusRect.Deflate(GetButtonBorderAndPadding());
  focusRect.Deflate(GetButtonInnerFocusMargin());
}


nsMargin
nsButtonFrameRenderer::GetButtonOuterFocusBorderAndPadding()
{
  nsMargin result(0,0,0,0);

  if (mOuterFocusStyle) {
    if (!mOuterFocusStyle->GetStylePadding()->GetPadding(result)) {
      NS_NOTYETIMPLEMENTED("percentage padding");
    }
    result += mOuterFocusStyle->GetStyleBorder()->GetBorder();
  }

  return result;
}

nsMargin
nsButtonFrameRenderer::GetButtonBorderAndPadding()
{
  return mFrame->GetUsedBorderAndPadding();
}

/**
 * Gets the size of the buttons border this is the union of the normal and disabled borders.
 */
nsMargin
nsButtonFrameRenderer::GetButtonInnerFocusMargin()
{
  nsMargin innerFocusMargin(0,0,0,0);

  if (mInnerFocusStyle) {
    const nsStyleMargin* margin = mInnerFocusStyle->GetStyleMargin();
    if (!margin->GetMargin(innerFocusMargin)) {
      NS_NOTYETIMPLEMENTED("percentage margin");
    }
  }

  return innerFocusMargin;
}

nsMargin
nsButtonFrameRenderer::GetButtonInnerFocusBorderAndPadding()
{
  nsMargin result(0,0,0,0);

  if (mInnerFocusStyle) {
    if (!mInnerFocusStyle->GetStylePadding()->GetPadding(result)) {
      NS_NOTYETIMPLEMENTED("percentage padding");
    }
    result += mInnerFocusStyle->GetStyleBorder()->GetBorder();
  }

  return result;
}

nsMargin
nsButtonFrameRenderer::GetButtonOutlineBorderAndPadding()
{
  nsMargin borderAndPadding(0,0,0,0);
  return borderAndPadding;
}

// gets the full size of our border with all the focus borders
nsMargin
nsButtonFrameRenderer::GetFullButtonBorderAndPadding()
{
  return GetAddedButtonBorderAndPadding() + GetButtonBorderAndPadding();
}

// gets all the focus borders and padding that will be added to the regular border
nsMargin
nsButtonFrameRenderer::GetAddedButtonBorderAndPadding()
{
  return GetButtonOuterFocusBorderAndPadding() + GetButtonInnerFocusMargin() + GetButtonInnerFocusBorderAndPadding();
}

/**
 * Call this when styles change
 */
void
nsButtonFrameRenderer::ReResolveStyles(nsPresContext* aPresContext)
{
  // get all the styles
  nsStyleContext* context = mFrame->GetStyleContext();
  nsStyleSet *styleSet = aPresContext->StyleSet();

  // style for the inner such as a dotted line (Windows)
  mInnerFocusStyle = styleSet->ProbePseudoStyleFor(mFrame->GetContent(),
                                                   nsCSSPseudoElements::mozFocusInner,
                                                   context);

  // style for outer focus like a ridged border (MAC).
  mOuterFocusStyle = styleSet->ProbePseudoStyleFor(mFrame->GetContent(),
                                                   nsCSSPseudoElements::mozFocusOuter,
                                                   context);
}

nsStyleContext*
nsButtonFrameRenderer::GetStyleContext(PRInt32 aIndex) const
{
  switch (aIndex) {
  case NS_BUTTON_RENDERER_FOCUS_INNER_CONTEXT_INDEX:
    return mInnerFocusStyle;
  case NS_BUTTON_RENDERER_FOCUS_OUTER_CONTEXT_INDEX:
    return mOuterFocusStyle;
  default:
    return nsnull;
  }
}

void 
nsButtonFrameRenderer::SetStyleContext(PRInt32 aIndex, nsStyleContext* aStyleContext)
{
  switch (aIndex) {
  case NS_BUTTON_RENDERER_FOCUS_INNER_CONTEXT_INDEX:
    mInnerFocusStyle = aStyleContext;
    break;
  case NS_BUTTON_RENDERER_FOCUS_OUTER_CONTEXT_INDEX:
    mOuterFocusStyle = aStyleContext;
    break;
  }
}