1/**
2 * Copyright (C) 2003, 2006 Apple 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 "EllipsisBox.h"
22
23#include "Document.h"
24#include "Font.h"
25#include "GraphicsContext.h"
26#include "HitTestResult.h"
27#include "InlineTextBox.h"
28#include "PaintInfo.h"
29#include "RootInlineBox.h"
30#include "TextRun.h"
31
32namespace WebCore {
33
34EllipsisBox::EllipsisBox(RenderBlockFlow& renderer, const AtomicString& ellipsisStr, InlineFlowBox* parent, int width, int height, int y, bool firstLine, bool isVertical, InlineBox* markupBox)
35    : InlineElementBox(renderer, FloatPoint(0, y), width, firstLine, true, false, false, isVertical, 0, 0, parent)
36    , m_shouldPaintMarkupBox(markupBox)
37    , m_height(height)
38    , m_str(ellipsisStr)
39    , m_selectionState(RenderObject::SelectionNone)
40{
41}
42
43void EllipsisBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
44{
45    GraphicsContext* context = paintInfo.context;
46    const RenderStyle& lineStyle = this->lineStyle();
47    Color textColor = lineStyle.visitedDependentColor(CSSPropertyWebkitTextFillColor);
48    if (textColor != context->fillColor())
49        context->setFillColor(textColor, lineStyle.colorSpace());
50    bool setShadow = false;
51    if (lineStyle.textShadow()) {
52        context->setShadow(LayoutSize(lineStyle.textShadow()->x(), lineStyle.textShadow()->y()),
53            lineStyle.textShadow()->radius(), lineStyle.textShadow()->color(), lineStyle.colorSpace());
54        setShadow = true;
55    }
56
57    const Font& font = lineStyle.font();
58    if (selectionState() != RenderObject::SelectionNone) {
59        paintSelection(context, paintOffset, lineStyle, font);
60
61        // Select the correct color for painting the text.
62        Color foreground = paintInfo.forceBlackText() ? Color::black : blockFlow().selectionForegroundColor();
63        if (foreground.isValid() && foreground != textColor)
64            context->setFillColor(foreground, lineStyle.colorSpace());
65    }
66
67    // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
68    context->drawText(font, RenderBlock::constructTextRun(&blockFlow(), font, m_str, lineStyle, TextRun::AllowTrailingExpansion), LayoutPoint(x() + paintOffset.x(), y() + paintOffset.y() + lineStyle.fontMetrics().ascent()));
69
70    // Restore the regular fill color.
71    if (textColor != context->fillColor())
72        context->setFillColor(textColor, lineStyle.colorSpace());
73
74    if (setShadow)
75        context->clearShadow();
76
77    paintMarkupBox(paintInfo, paintOffset, lineTop, lineBottom, lineStyle);
78}
79
80InlineBox* EllipsisBox::markupBox() const
81{
82    if (!m_shouldPaintMarkupBox)
83        return 0;
84
85    RootInlineBox* lastLine = blockFlow().lineAtIndex(blockFlow().lineCount() - 1);
86    if (!lastLine)
87        return 0;
88
89    // If the last line-box on the last line of a block is a link, -webkit-line-clamp paints that box after the ellipsis.
90    // It does not actually move the link.
91    InlineBox* anchorBox = lastLine->lastChild();
92    if (!anchorBox || !anchorBox->renderer().style().isLink())
93        return 0;
94
95    return anchorBox;
96}
97
98void EllipsisBox::paintMarkupBox(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, const RenderStyle& style)
99{
100    InlineBox* markupBox = this->markupBox();
101    if (!markupBox)
102        return;
103
104    LayoutPoint adjustedPaintOffset = paintOffset;
105    adjustedPaintOffset.move(x() + m_logicalWidth - markupBox->x(),
106        y() + style.fontMetrics().ascent() - (markupBox->y() + markupBox->lineStyle().fontMetrics().ascent()));
107    markupBox->paint(paintInfo, adjustedPaintOffset, lineTop, lineBottom);
108}
109
110IntRect EllipsisBox::selectionRect()
111{
112    const RenderStyle& lineStyle = this->lineStyle();
113    const Font& font = lineStyle.font();
114    const RootInlineBox& rootBox = root();
115    // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
116    LayoutRect selectionRect = LayoutRect(x(), y() + rootBox.selectionTopAdjustedForPrecedingBlock(), 0, rootBox.selectionHeightAdjustedForPrecedingBlock());
117    font.adjustSelectionRectForText(RenderBlock::constructTextRun(&blockFlow(), font, m_str, lineStyle, TextRun::AllowTrailingExpansion), selectionRect);
118    // FIXME: use directional pixel snapping instead.
119    return enclosingIntRect(selectionRect);
120}
121
122void EllipsisBox::paintSelection(GraphicsContext* context, const LayoutPoint& paintOffset, const RenderStyle& style, const Font& font)
123{
124    Color textColor = style.visitedDependentColor(CSSPropertyColor);
125    Color c = blockFlow().selectionBackgroundColor();
126    if (!c.isValid() || !c.alpha())
127        return;
128
129    // If the text color ends up being the same as the selection background, invert the selection
130    // background.
131    if (textColor == c)
132        c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());
133
134    const RootInlineBox& rootBox = root();
135    GraphicsContextStateSaver stateSaver(*context);
136    // FIXME: Why is this always LTR? Fix by passing correct text run flags below.
137    LayoutRect selectionRect = LayoutRect(x() + paintOffset.x(), y() + paintOffset.y() + rootBox.selectionTop(), 0, rootBox.selectionHeight());
138    TextRun run = RenderBlock::constructTextRun(&blockFlow(), font, m_str, style, TextRun::AllowTrailingExpansion);
139    font.adjustSelectionRectForText(run, selectionRect, 0, -1);
140    context->fillRect(directionalPixelSnappedForPainting(selectionRect, renderer().document().deviceScaleFactor(), run.ltr()), c, style.colorSpace());
141}
142
143bool EllipsisBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
144{
145    LayoutPoint adjustedLocation = accumulatedOffset + roundedLayoutPoint(topLeft());
146
147    // Hit test the markup box.
148    if (InlineBox* markupBox = this->markupBox()) {
149        const RenderStyle& lineStyle = this->lineStyle();
150        LayoutUnit mtx = adjustedLocation.x() + m_logicalWidth - markupBox->x();
151        LayoutUnit mty = adjustedLocation.y() + lineStyle.fontMetrics().ascent() - (markupBox->y() + markupBox->lineStyle().fontMetrics().ascent());
152        if (markupBox->nodeAtPoint(request, result, locationInContainer, LayoutPoint(mtx, mty), lineTop, lineBottom)) {
153            blockFlow().updateHitTestResult(result, locationInContainer.point() - LayoutSize(mtx, mty));
154            return true;
155        }
156    }
157
158    LayoutRect boundsRect(adjustedLocation, LayoutSize(m_logicalWidth, m_height));
159    if (visibleToHitTesting() && boundsRect.intersects(HitTestLocation::rectForPoint(locationInContainer.point(), 0, 0, 0, 0))) {
160        blockFlow().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
161        if (!result.addNodeToRectBasedTestResult(blockFlow().element(), request, locationInContainer, boundsRect))
162            return true;
163    }
164
165    return false;
166}
167
168} // namespace WebCore
169