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      1 /**
      2  * Copyright (C) 2003, 2006 Apple Computer, Inc.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #include "config.h"
     21 #include "core/rendering/EllipsisBox.h"
     22 
     23 #include "core/platform/graphics/DrawLooper.h"
     24 #include "core/platform/graphics/Font.h"
     25 #include "core/platform/graphics/GraphicsContextStateSaver.h"
     26 #include "core/platform/graphics/TextRun.h"
     27 #include "core/rendering/HitTestResult.h"
     28 #include "core/rendering/InlineTextBox.h"
     29 #include "core/rendering/PaintInfo.h"
     30 #include "core/rendering/RenderBlock.h"
     31 #include "core/rendering/RootInlineBox.h"
     32 #include "core/rendering/style/ShadowData.h"
     33 
     34 namespace WebCore {
     35 
     36 void EllipsisBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
     37 {
     38     GraphicsContext* context = paintInfo.context;
     39     RenderStyle* style = m_renderer->style(isFirstLineStyle());
     40     Color styleTextColor = m_renderer->resolveColor(style, CSSPropertyWebkitTextFillColor);
     41     if (styleTextColor != context->fillColor())
     42         context->setFillColor(styleTextColor);
     43 
     44     Color textColor = styleTextColor;
     45     const Font& font = style->font();
     46     if (selectionState() != RenderObject::SelectionNone) {
     47         paintSelection(context, paintOffset, style, font);
     48 
     49         // Select the correct color for painting the text.
     50         Color foreground = paintInfo.forceBlackText() ? Color::black : renderer()->selectionForegroundColor();
     51         if (foreground != Color::transparent && foreground != styleTextColor)
     52             context->setFillColor(foreground);
     53     }
     54 
     55     // Text shadows are disabled when printing. http://crbug.com/258321
     56     const ShadowData* shadow = context->printing() ? 0 : style->textShadow();
     57     bool hasShadow = shadow;
     58     if (hasShadow) {
     59         DrawLooper drawLooper;
     60         do {
     61             int shadowX = isHorizontal() ? shadow->x() : shadow->y();
     62             int shadowY = isHorizontal() ? shadow->y() : -shadow->x();
     63             FloatSize offset(shadowX, shadowY);
     64             drawLooper.addShadow(offset, shadow->blur(),
     65                 m_renderer->resolveColor(shadow->color(), Color::stdShadowColor),
     66                 DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
     67         } while ((shadow = shadow->next()));
     68         drawLooper.addUnmodifiedContent();
     69         context->setDrawLooper(drawLooper);
     70     }
     71 
     72     // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
     73     FloatPoint boxOrigin(paintOffset);
     74     boxOrigin.move(x(), y());
     75     FloatRect boxRect(boxOrigin, LayoutSize(logicalWidth(), logicalHeight()));
     76     FloatPoint textOrigin(boxOrigin.x(), boxOrigin.y() + style->fontMetrics().ascent());
     77     TextRun textRun = RenderBlock::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion);
     78     TextRunPaintInfo textRunPaintInfo(textRun);
     79     textRunPaintInfo.bounds = boxRect;
     80     context->drawText(font, textRunPaintInfo, textOrigin);
     81 
     82     // Restore the regular fill color.
     83     if (styleTextColor != context->fillColor())
     84         context->setFillColor(styleTextColor);
     85 
     86     if (hasShadow)
     87         context->clearDrawLooper();
     88 
     89     paintMarkupBox(paintInfo, paintOffset, lineTop, lineBottom, style);
     90 }
     91 
     92 InlineBox* EllipsisBox::markupBox() const
     93 {
     94     if (!m_shouldPaintMarkupBox || !m_renderer->isRenderBlock())
     95         return 0;
     96 
     97     RenderBlock* block = toRenderBlock(m_renderer);
     98     RootInlineBox* lastLine = block->lineAtIndex(block->lineCount() - 1);
     99     if (!lastLine)
    100         return 0;
    101 
    102     // If the last line-box on the last line of a block is a link, -webkit-line-clamp paints that box after the ellipsis.
    103     // It does not actually move the link.
    104     InlineBox* anchorBox = lastLine->lastChild();
    105     if (!anchorBox || !anchorBox->renderer()->style()->isLink())
    106         return 0;
    107 
    108     return anchorBox;
    109 }
    110 
    111 void EllipsisBox::paintMarkupBox(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, RenderStyle* style)
    112 {
    113     InlineBox* markupBox = this->markupBox();
    114     if (!markupBox)
    115         return;
    116 
    117     LayoutPoint adjustedPaintOffset = paintOffset;
    118     adjustedPaintOffset.move(x() + m_logicalWidth - markupBox->x(),
    119         y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer()->style(isFirstLineStyle())->fontMetrics().ascent()));
    120     markupBox->paint(paintInfo, adjustedPaintOffset, lineTop, lineBottom);
    121 }
    122 
    123 IntRect EllipsisBox::selectionRect()
    124 {
    125     RenderStyle* style = m_renderer->style(isFirstLineStyle());
    126     const Font& font = style->font();
    127     // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
    128     return enclosingIntRect(font.selectionRectForText(RenderBlock::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), IntPoint(x(), y() + root()->selectionTopAdjustedForPrecedingBlock()), root()->selectionHeightAdjustedForPrecedingBlock()));
    129 }
    130 
    131 void EllipsisBox::paintSelection(GraphicsContext* context, const LayoutPoint& paintOffset, RenderStyle* style, const Font& font)
    132 {
    133     Color textColor = m_renderer->resolveColor(style, CSSPropertyColor);
    134     Color c = m_renderer->selectionBackgroundColor();
    135     if (!c.alpha())
    136         return;
    137 
    138     // If the text color ends up being the same as the selection background, invert the selection
    139     // background.
    140     if (textColor == c)
    141         c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());
    142 
    143     GraphicsContextStateSaver stateSaver(*context);
    144     LayoutUnit top = root()->selectionTop();
    145     LayoutUnit h = root()->selectionHeight();
    146     FloatRect clipRect(x() + paintOffset.x(), top + paintOffset.y(), m_logicalWidth, h);
    147     alignSelectionRectToDevicePixels(clipRect);
    148     context->clip(clipRect);
    149     // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
    150     context->drawHighlightForText(font, RenderBlock::constructTextRun(renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), roundedIntPoint(LayoutPoint(x() + paintOffset.x(), y() + paintOffset.y() + top)), h, c);
    151 }
    152 
    153 bool EllipsisBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
    154 {
    155     LayoutPoint adjustedLocation = accumulatedOffset + roundedLayoutPoint(topLeft());
    156 
    157     // Hit test the markup box.
    158     if (InlineBox* markupBox = this->markupBox()) {
    159         RenderStyle* style = m_renderer->style(isFirstLineStyle());
    160         LayoutUnit mtx = adjustedLocation.x() + m_logicalWidth - markupBox->x();
    161         LayoutUnit mty = adjustedLocation.y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer()->style(isFirstLineStyle())->fontMetrics().ascent());
    162         if (markupBox->nodeAtPoint(request, result, locationInContainer, LayoutPoint(mtx, mty), lineTop, lineBottom)) {
    163             renderer()->updateHitTestResult(result, locationInContainer.point() - LayoutSize(mtx, mty));
    164             return true;
    165         }
    166     }
    167 
    168     LayoutRect boundsRect(adjustedLocation, LayoutSize(m_logicalWidth, m_height));
    169     if (visibleToHitTestRequest(request) && boundsRect.intersects(HitTestLocation::rectForPoint(locationInContainer.point(), 0, 0, 0, 0))) {
    170         renderer()->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
    171         if (!result.addNodeToRectBasedTestResult(renderer()->node(), request, locationInContainer, boundsRect))
    172             return true;
    173     }
    174 
    175     return false;
    176 }
    177 
    178 } // namespace WebCore
    179