C++ nsRenderingContext::SetColor方法代码示例

void
nsTableCellFrame::DecorateForSelection(nsRenderingContext& aRenderingContext,
                                       nsPoint aPt)
{
  NS_ASSERTION(GetStateBits() & NS_FRAME_SELECTED_CONTENT,
               "Should only be called for selected cells");
  PRInt16 displaySelection;
  nsPresContext* presContext = PresContext();
  displaySelection = DisplaySelection(presContext);
  if (displaySelection) {
    nsRefPtr<nsFrameSelection> frameSelection =
      presContext->PresShell()->FrameSelection();

    if (frameSelection->GetTableCellSelection()) {
      nscolor       bordercolor;
      if (displaySelection == nsISelectionController::SELECTION_DISABLED) {
        bordercolor = NS_RGB(176,176,176);// disabled color
      }
      else {
        bordercolor =
          LookAndFeel::GetColor(LookAndFeel::eColorID_TextSelectBackground);
      }
      nscoord threePx = nsPresContext::CSSPixelsToAppUnits(3);
      if ((mRect.width > threePx) && (mRect.height > threePx))
      {
        //compare bordercolor to ((nsStyleColor *)myColor)->mBackgroundColor)
        bordercolor = EnsureDifferentColors(bordercolor,
                                            GetStyleBackground()->mBackgroundColor);
        nsRenderingContext::AutoPushTranslation
            translate(&aRenderingContext, aPt);
        nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);

        aRenderingContext.SetColor(bordercolor);
        aRenderingContext.DrawLine(onePixel, 0, mRect.width, 0);
        aRenderingContext.DrawLine(0, onePixel, 0, mRect.height);
        aRenderingContext.DrawLine(onePixel, mRect.height, mRect.width, mRect.height);
        aRenderingContext.DrawLine(mRect.width, onePixel, mRect.width, mRect.height);
        //middle
        aRenderingContext.DrawRect(onePixel, onePixel, mRect.width-onePixel,
                                   mRect.height-onePixel);
        //shading
        aRenderingContext.DrawLine(2*onePixel, mRect.height-2*onePixel,
                                   mRect.width-onePixel, mRect.height- (2*onePixel));
        aRenderingContext.DrawLine(mRect.width - (2*onePixel), 2*onePixel,
                                   mRect.width - (2*onePixel), mRect.height-onePixel);
      }
    }
  }
}

void
nsPageFrame::PaintHeaderFooter(nsRenderingContext& aRenderingContext,
                               nsPoint aPt)
{
  nsPresContext* pc = PresContext();

  if (!mPD->mPrintSettings) {
    if (pc->Type() == nsPresContext::eContext_PrintPreview || pc->IsDynamic())
      mPD->mPrintSettings = pc->GetPrintSettings();
    if (!mPD->mPrintSettings)
      return;
  }

  nsRect rect(aPt, mRect.Size());
  aRenderingContext.SetColor(NS_RGB(0,0,0));

  // Get the FontMetrics to determine width.height of strings
  nsRefPtr<nsFontMetrics> fontMet;
  pc->DeviceContext()->GetMetricsFor(*mPD->mHeadFootFont, nullptr,
                                     pc->GetUserFontSet(),
                                     *getter_AddRefs(fontMet));

  aRenderingContext.SetFont(fontMet);

  nscoord ascent = 0;
  nscoord visibleHeight = 0;
  if (fontMet) {
    visibleHeight = fontMet->MaxHeight();
    ascent = fontMet->MaxAscent();
  }

  // print document headers and footers
  nsXPIDLString headerLeft, headerCenter, headerRight;
  mPD->mPrintSettings->GetHeaderStrLeft(getter_Copies(headerLeft));
  mPD->mPrintSettings->GetHeaderStrCenter(getter_Copies(headerCenter));
  mPD->mPrintSettings->GetHeaderStrRight(getter_Copies(headerRight));
  DrawHeaderFooter(aRenderingContext, eHeader,
                   headerLeft, headerCenter, headerRight,
                   rect, ascent, visibleHeight);

  nsXPIDLString footerLeft, footerCenter, footerRight;
  mPD->mPrintSettings->GetFooterStrLeft(getter_Copies(footerLeft));
  mPD->mPrintSettings->GetFooterStrCenter(getter_Copies(footerCenter));
  mPD->mPrintSettings->GetFooterStrRight(getter_Copies(footerRight));
  DrawHeaderFooter(aRenderingContext, eFooter,
                   footerLeft, footerCenter, footerRight,
                   rect, ascent, visibleHeight);
}

// Draw a header or footer string
// @param aRenderingContext - rendering context to draw into
// @param aHeaderFooter - indicates whether it is a header or footer
// @param aJust - indicates where the string is located within the header/footer
// @param aStr - the string to be drawn
// @param aRect - the rect of the page
// @param aHeight - the height of the font
// @param aAscent - the ascent of the font
// @param aWidth - available width for the string
void
nsPageFrame::DrawHeaderFooter(nsRenderingContext& aRenderingContext,
                              nsHeaderFooterEnum   aHeaderFooter,
                              int32_t              aJust,
                              const nsString&      aStr,
                              const nsRect&        aRect,
                              nscoord              aAscent,
                              nscoord              aHeight,
                              nscoord              aWidth)
{

  nscoord contentWidth = aWidth - (mPD->mEdgePaperMargin.left + mPD->mEdgePaperMargin.right);

  if ((aHeaderFooter == eHeader && aHeight < mPD->mReflowMargin.top) ||
      (aHeaderFooter == eFooter && aHeight < mPD->mReflowMargin.bottom)) {
    nsAutoString str;
    ProcessSpecialCodes(aStr, str);

    int32_t indx;
    int32_t textWidth = 0;
    const PRUnichar* text = str.get();

    int32_t len = (int32_t)str.Length();
    if (len == 0) {
      return; // bail is empty string
    }
    // find how much text fits, the "position" is the size of the available area
    if (nsLayoutUtils::BinarySearchForPosition(&aRenderingContext, text, 0, 0, 0, len,
                                int32_t(contentWidth), indx, textWidth)) {
      if (indx < len-1 ) {
        // we can't fit in all the text
        if (indx > 3) {
          // But we can fit in at least 4 chars.  Show all but 3 of them, then
          // an ellipsis.
          // XXXbz for non-plane0 text, this may be cutting things in the
          // middle of a codepoint!  Also, we have no guarantees that the three
          // dots will fit in the space the three chars we removed took up with
          // these font metrics!
          str.Truncate(indx-3);
          str.AppendLiteral("...");
        } else {
          // We can only fit 3 or fewer chars.  Just show nothing
          str.Truncate();
        }
      }
    } else { 
      return; // bail if couldn't find the correct length
    }
    
    if (HasRTLChars(str)) {
      PresContext()->SetBidiEnabled();
    }

    // cacl the x and y positions of the text
    nscoord x = GetXPosition(aRenderingContext, aRect, aJust, str);
    nscoord y;
    if (aHeaderFooter == eHeader) {
      y = aRect.y + mPD->mExtraMargin.top + mPD->mEdgePaperMargin.top;
    } else {
      y = aRect.YMost() - aHeight - mPD->mExtraMargin.bottom - mPD->mEdgePaperMargin.bottom;
    }

    // set up new clip and draw the text
    aRenderingContext.PushState();
    aRenderingContext.SetColor(NS_RGB(0,0,0));
    aRenderingContext.IntersectClip(aRect);
    nsLayoutUtils::DrawString(this, &aRenderingContext, str.get(), str.Length(), nsPoint(x, y + aAscent));
    aRenderingContext.PopState();
  }
}