WebCore/rendering/RenderSVGInlineText.cpp

   1 /*
   2  * This file is part of the WebKit project.
   3  *
   4  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
   5  *           (C) 2006 Apple Computer Inc.
   6  *           (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
   7  *           (C) 2008 Rob Buis <buis@kde.org>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Library General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Library General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Library General Public License
  20  * along with this library; see the file COPYING.LIB.  If not, write to
  21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22  * Boston, MA 02110-1301, USA.
  23  *
  24  */
  25
  26 #include "config.h"
  27
  28 #if ENABLE(SVG)
  29 #include "RenderSVGInlineText.h"
  30
  31 #include "FloatConversion.h"
  32 #include "RenderBlock.h"
  33 #include "RenderSVGRoot.h"
  34 #include "SVGInlineTextBox.h"
  35 #include "SVGRootInlineBox.h"
  36
  37 namespace WebCore {
  38
  39 static inline bool isChildOfHiddenContainer(RenderObject* start)
  40 {
  41     while (start) {
  42         if (start->isSVGHiddenContainer())
  43             return true;
  44
  45         start = start->parent();
  46     }
  47
  48     return false;
  49 }
  50
  51 RenderSVGInlineText::RenderSVGInlineText(Node* n, PassRefPtr<StringImpl> str)
  52     : RenderText(n, str)
  53 {
  54 }
  55
  56 void RenderSVGInlineText::absoluteRects(Vector<IntRect>& rects, int, int, bool)
  57 {
  58     rects.append(computeAbsoluteRectForRange(0, textLength()));
  59 }
  60
  61 IntRect RenderSVGInlineText::selectionRect(bool)
  62 {
  63     ASSERT(!needsLayout());
  64
  65     IntRect rect;
  66     if (selectionState() == SelectionNone)
  67         return rect;
  68
  69     // Early exit if we're ie. a <text> within a <defs> section.
  70     if (isChildOfHiddenContainer(this))
  71         return rect;
  72
  73     // Now calculate startPos and endPos for painting selection.
  74     // We include a selection while endPos > 0
  75     int startPos, endPos;
  76     if (selectionState() == SelectionInside) {
  77         // We are fully selected.
  78         startPos = 0;
  79         endPos = textLength();
  80     } else {
  81         selectionStartEnd(startPos, endPos);
  82         if (selectionState() == SelectionStart)
  83             endPos = textLength();
  84         else if (selectionState() == SelectionEnd)
  85             startPos = 0;
  86     }
  87
  88     if (startPos == endPos)
  89         return rect;
  90
  91     return computeAbsoluteRectForRange(startPos, endPos);
  92 }
  93
  94 IntRect RenderSVGInlineText::computeAbsoluteRectForRange(int startPos, int endPos)
  95 {
  96     IntRect rect;
  97
  98     RenderBlock* cb = containingBlock();
  99     if (!cb || !cb->container())
 100         return rect;
 101
 102     RenderSVGRoot* root = findSVGRootObject(parent());
 103     if (!root)
 104         return rect;
 105
 106     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
 107         rect.unite(box->selectionRect(0, 0, startPos, endPos));
 108
 109     // Mimic RenderBox::computeAbsoluteRepaintRect() functionality. But only the subset needed for SVG and respecting SVG transformations.
 110     FloatPoint absPos = cb->container()->localToAbsolute();
 111
 112     // Remove HTML parent translation offsets here! These need to be retrieved from the RenderSVGRoot object.
 113     // But do take the containingBlocks's container position into account, ie. SVG text in scrollable <div>.
 114     AffineTransform htmlParentCtm = root->RenderContainer::absoluteTransform();
 115
 116     FloatRect fixedRect(narrowPrecisionToFloat(rect.x() + absPos.x() - xPos() - htmlParentCtm.e()),
 117                         narrowPrecisionToFloat(rect.y() + absPos.y() - yPos() - htmlParentCtm.f()), rect.width(), rect.height());
 118     return enclosingIntRect(absoluteTransform().mapRect(fixedRect));
 119 }
 120
 121 InlineTextBox* RenderSVGInlineText::createInlineTextBox()
 122 {
 123     return new (renderArena()) SVGInlineTextBox(this);
 124 }
 125
 126 IntRect RenderSVGInlineText::caretRect(InlineBox* inlineBox, int caretOffset, int* extraWidthToEndOfLine)
 127 {
 128     // SVG doesn't have any editable content where a caret rect would be needed
 129     return IntRect();
 130 }
 131
 132 VisiblePosition RenderSVGInlineText::positionForCoordinates(int x, int y)
 133 {
 134     SVGInlineTextBox* textBox = static_cast<SVGInlineTextBox*>(firstTextBox());
 135
 136     if (!textBox || textLength() == 0)
 137         return VisiblePosition(element(), 0, DOWNSTREAM);
 138
 139     SVGRootInlineBox* rootBox = textBox->svgRootInlineBox();
 140     RenderObject* object = rootBox ? rootBox->object() : 0;
 141
 142     if (!object)
 143         return VisiblePosition(element(), 0, DOWNSTREAM);
 144
 145     int offset = 0;
 146
 147     for (SVGInlineTextBox* box = textBox; box; box = static_cast<SVGInlineTextBox*>(box->nextTextBox())) {
 148         if (box->svgCharacterHitsPosition(x + object->xPos(), y + object->yPos(), offset)) {
 149             // If we're not at the end/start of the box, stop looking for other selected boxes.
 150             if (box->direction() == LTR) {
 151                 if (offset <= (int) box->end() + 1)
 152                     break;
 153             } else {
 154                 if (offset > (int) box->start())
 155                     break;
 156             }
 157         }
 158     }
 159
 160     return VisiblePosition(element(), offset, DOWNSTREAM);
 161 }
 162
 163 void RenderSVGInlineText::destroy()
 164 {
 165     if (!documentBeingDestroyed()) {
 166         setNeedsLayoutAndPrefWidthsRecalc();
 167         repaint();
 168     }
 169     RenderText::destroy();
 170 }
 171
 172 }
 173
 174 #endif // ENABLE(SVG)