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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  * Copyright (C) 2004, 2005, 2006, 2009, 2011 Apple Inc. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 #include "HTMLAreaElement.h"
     24 
     25 #include "AffineTransform.h"
     26 #include "Attribute.h"
     27 #include "Frame.h"
     28 #include "HTMLImageElement.h"
     29 #include "HTMLMapElement.h"
     30 #include "HTMLNames.h"
     31 #include "HitTestResult.h"
     32 #include "Path.h"
     33 #include "RenderImage.h"
     34 
     35 using namespace std;
     36 
     37 namespace WebCore {
     38 
     39 using namespace HTMLNames;
     40 
     41 inline HTMLAreaElement::HTMLAreaElement(const QualifiedName& tagName, Document* document)
     42     : HTMLAnchorElement(tagName, document)
     43     , m_coordsLen(0)
     44     , m_lastSize(-1, -1)
     45     , m_shape(Unknown)
     46 {
     47     ASSERT(hasTagName(areaTag));
     48 }
     49 
     50 PassRefPtr<HTMLAreaElement> HTMLAreaElement::create(const QualifiedName& tagName, Document* document)
     51 {
     52     return adoptRef(new HTMLAreaElement(tagName, document));
     53 }
     54 
     55 void HTMLAreaElement::parseMappedAttribute(Attribute* attr)
     56 {
     57     if (attr->name() == shapeAttr) {
     58         if (equalIgnoringCase(attr->value(), "default"))
     59             m_shape = Default;
     60         else if (equalIgnoringCase(attr->value(), "circle"))
     61             m_shape = Circle;
     62         else if (equalIgnoringCase(attr->value(), "poly"))
     63             m_shape = Poly;
     64         else if (equalIgnoringCase(attr->value(), "rect"))
     65             m_shape = Rect;
     66     } else if (attr->name() == coordsAttr) {
     67         m_coords = newCoordsArray(attr->value().string(), m_coordsLen);
     68     } else if (attr->name() == altAttr || attr->name() == accesskeyAttr) {
     69         // Do nothing.
     70     } else
     71         HTMLAnchorElement::parseMappedAttribute(attr);
     72 }
     73 
     74 bool HTMLAreaElement::mapMouseEvent(int x, int y, const IntSize& size, HitTestResult& result)
     75 {
     76     if (m_lastSize != size) {
     77         m_region = adoptPtr(new Path(getRegion(size)));
     78         m_lastSize = size;
     79     }
     80 
     81     if (!m_region->contains(IntPoint(x, y)))
     82         return false;
     83 
     84     result.setInnerNode(this);
     85     result.setURLElement(this);
     86     return true;
     87 }
     88 
     89 Path HTMLAreaElement::computePath(RenderObject* obj) const
     90 {
     91     if (!obj)
     92         return Path();
     93 
     94     // FIXME: This doesn't work correctly with transforms.
     95     FloatPoint absPos = obj->localToAbsolute();
     96 
     97     // Default should default to the size of the containing object.
     98     IntSize size = m_lastSize;
     99     if (m_shape == Default)
    100         size = obj->absoluteOutlineBounds().size();
    101 
    102     Path p = getRegion(size);
    103     float zoomFactor = document()->frame()->pageZoomFactor();
    104     if (zoomFactor != 1.0f) {
    105         AffineTransform zoomTransform;
    106         zoomTransform.scale(zoomFactor);
    107         p.transform(zoomTransform);
    108     }
    109 
    110     p.translate(absPos - FloatPoint());
    111     return p;
    112 }
    113 
    114 IntRect HTMLAreaElement::computeRect(RenderObject* obj) const
    115 {
    116     return enclosingIntRect(computePath(obj).boundingRect());
    117 }
    118 
    119 Path HTMLAreaElement::getRegion(const IntSize& size) const
    120 {
    121     if (!m_coords && m_shape != Default)
    122         return Path();
    123 
    124     int width = size.width();
    125     int height = size.height();
    126 
    127     // If element omits the shape attribute, select shape based on number of coordinates.
    128     Shape shape = m_shape;
    129     if (shape == Unknown) {
    130         if (m_coordsLen == 3)
    131             shape = Circle;
    132         else if (m_coordsLen == 4)
    133             shape = Rect;
    134         else if (m_coordsLen >= 6)
    135             shape = Poly;
    136     }
    137 
    138     Path path;
    139     switch (shape) {
    140         case Poly:
    141             if (m_coordsLen >= 6) {
    142                 int numPoints = m_coordsLen / 2;
    143                 path.moveTo(FloatPoint(m_coords[0].calcMinValue(width), m_coords[1].calcMinValue(height)));
    144                 for (int i = 1; i < numPoints; ++i)
    145                     path.addLineTo(FloatPoint(m_coords[i * 2].calcMinValue(width), m_coords[i * 2 + 1].calcMinValue(height)));
    146                 path.closeSubpath();
    147             }
    148             break;
    149         case Circle:
    150             if (m_coordsLen >= 3) {
    151                 Length radius = m_coords[2];
    152                 int r = min(radius.calcMinValue(width), radius.calcMinValue(height));
    153                 path.addEllipse(FloatRect(m_coords[0].calcMinValue(width) - r, m_coords[1].calcMinValue(height) - r, 2 * r, 2 * r));
    154             }
    155             break;
    156         case Rect:
    157             if (m_coordsLen >= 4) {
    158                 int x0 = m_coords[0].calcMinValue(width);
    159                 int y0 = m_coords[1].calcMinValue(height);
    160                 int x1 = m_coords[2].calcMinValue(width);
    161                 int y1 = m_coords[3].calcMinValue(height);
    162                 path.addRect(FloatRect(x0, y0, x1 - x0, y1 - y0));
    163             }
    164             break;
    165         case Default:
    166             path.addRect(FloatRect(0, 0, width, height));
    167             break;
    168         case Unknown:
    169             break;
    170     }
    171 
    172     return path;
    173 }
    174 
    175 HTMLImageElement* HTMLAreaElement::imageElement() const
    176 {
    177     Node* mapElement = parentNode();
    178     if (!mapElement || !mapElement->hasTagName(mapTag))
    179         return 0;
    180 
    181     return static_cast<HTMLMapElement*>(mapElement)->imageElement();
    182 }
    183 
    184 bool HTMLAreaElement::isKeyboardFocusable(KeyboardEvent*) const
    185 {
    186     return isFocusable();
    187 }
    188 
    189 bool HTMLAreaElement::isMouseFocusable() const
    190 {
    191     return isFocusable();
    192 }
    193 
    194 bool HTMLAreaElement::isFocusable() const
    195 {
    196     return supportsFocus() && Element::tabIndex() >= 0;
    197 }
    198 
    199 void HTMLAreaElement::setFocus(bool shouldBeFocused)
    200 {
    201     if (focused() == shouldBeFocused)
    202         return;
    203 
    204     HTMLAnchorElement::setFocus(shouldBeFocused);
    205 
    206     HTMLImageElement* imageElement = this->imageElement();
    207     if (!imageElement)
    208         return;
    209 
    210     RenderObject* renderer = imageElement->renderer();
    211     if (!renderer || !renderer->isImage())
    212         return;
    213 
    214     toRenderImage(renderer)->areaElementFocusChanged(this);
    215 }
    216 
    217 void HTMLAreaElement::updateFocusAppearance(bool restorePreviousSelection)
    218 {
    219     if (!isFocusable())
    220         return;
    221 
    222     HTMLImageElement* imageElement = this->imageElement();
    223     if (!imageElement)
    224         return;
    225 
    226     imageElement->updateFocusAppearance(restorePreviousSelection);
    227 }
    228 
    229 bool HTMLAreaElement::supportsFocus() const
    230 {
    231     // If the AREA element was a link, it should support focus.
    232     // The inherited method is not used because it assumes that a render object must exist
    233     // for the element to support focus. AREA elements do not have render objects.
    234     return isLink();
    235 }
    236 
    237 String HTMLAreaElement::target() const
    238 {
    239     return getAttribute(targetAttr);
    240 }
    241 
    242 }
    243