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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 "core/html/HTMLAreaElement.h"
     24 
     25 #include "core/HTMLNames.h"
     26 #include "core/html/HTMLImageElement.h"
     27 #include "core/html/HTMLMapElement.h"
     28 #include "core/rendering/HitTestResult.h"
     29 #include "core/rendering/RenderImage.h"
     30 #include "core/rendering/RenderView.h"
     31 #include "platform/LengthFunctions.h"
     32 #include "platform/graphics/Path.h"
     33 #include "platform/transforms/AffineTransform.h"
     34 
     35 namespace WebCore {
     36 
     37 using namespace HTMLNames;
     38 
     39 inline HTMLAreaElement::HTMLAreaElement(Document& document)
     40     : HTMLAnchorElement(areaTag, document)
     41     , m_lastSize(-1, -1)
     42     , m_shape(Unknown)
     43 {
     44     ScriptWrappable::init(this);
     45 }
     46 
     47 DEFINE_NODE_FACTORY(HTMLAreaElement)
     48 
     49 void HTMLAreaElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     50 {
     51     if (name == shapeAttr) {
     52         if (equalIgnoringCase(value, "default"))
     53             m_shape = Default;
     54         else if (equalIgnoringCase(value, "circle"))
     55             m_shape = Circle;
     56         else if (equalIgnoringCase(value, "poly"))
     57             m_shape = Poly;
     58         else if (equalIgnoringCase(value, "rect"))
     59             m_shape = Rect;
     60         invalidateCachedRegion();
     61     } else if (name == coordsAttr) {
     62         m_coords = parseHTMLAreaElementCoords(value.string());
     63         invalidateCachedRegion();
     64     } else if (name == altAttr || name == accesskeyAttr) {
     65         // Do nothing.
     66     } else
     67         HTMLAnchorElement::parseAttribute(name, value);
     68 }
     69 
     70 void HTMLAreaElement::invalidateCachedRegion()
     71 {
     72     m_lastSize = LayoutSize(-1, -1);
     73 }
     74 
     75 bool HTMLAreaElement::mapMouseEvent(LayoutPoint location, const LayoutSize& size, HitTestResult& result)
     76 {
     77     if (m_lastSize != size) {
     78         m_region = adoptPtr(new Path(getRegion(size)));
     79         m_lastSize = size;
     80     }
     81 
     82     if (!m_region->contains(location))
     83         return false;
     84 
     85     result.setInnerNode(this);
     86     result.setURLElement(this);
     87     return true;
     88 }
     89 
     90 Path HTMLAreaElement::computePath(RenderObject* obj) const
     91 {
     92     if (!obj)
     93         return Path();
     94 
     95     // FIXME: This doesn't work correctly with transforms.
     96     FloatPoint absPos = obj->localToAbsolute();
     97 
     98     // Default should default to the size of the containing object.
     99     LayoutSize size = m_lastSize;
    100     if (m_shape == Default)
    101         size = obj->absoluteClippedOverflowRect().size();
    102 
    103     Path p = getRegion(size);
    104     float zoomFactor = obj->style()->effectiveZoom();
    105     if (zoomFactor != 1.0f) {
    106         AffineTransform zoomTransform;
    107         zoomTransform.scale(zoomFactor);
    108         p.transform(zoomTransform);
    109     }
    110 
    111     p.translate(toFloatSize(absPos));
    112     return p;
    113 }
    114 
    115 LayoutRect HTMLAreaElement::computeRect(RenderObject* obj) const
    116 {
    117     return enclosingLayoutRect(computePath(obj).boundingRect());
    118 }
    119 
    120 Path HTMLAreaElement::getRegion(const LayoutSize& size) const
    121 {
    122     if (m_coords.isEmpty() && m_shape != Default)
    123         return Path();
    124 
    125     LayoutUnit width = size.width();
    126     LayoutUnit height = size.height();
    127 
    128     // If element omits the shape attribute, select shape based on number of coordinates.
    129     Shape shape = m_shape;
    130     if (shape == Unknown) {
    131         if (m_coords.size() == 3)
    132             shape = Circle;
    133         else if (m_coords.size() == 4)
    134             shape = Rect;
    135         else if (m_coords.size() >= 6)
    136             shape = Poly;
    137     }
    138 
    139     Path path;
    140     switch (shape) {
    141         case Poly:
    142             if (m_coords.size() >= 6) {
    143                 int numPoints = m_coords.size() / 2;
    144                 path.moveTo(FloatPoint(minimumValueForLength(m_coords[0], width).toFloat(), minimumValueForLength(m_coords[1], height).toFloat()));
    145                 for (int i = 1; i < numPoints; ++i)
    146                     path.addLineTo(FloatPoint(minimumValueForLength(m_coords[i * 2], width).toFloat(), minimumValueForLength(m_coords[i * 2 + 1], height).toFloat()));
    147                 path.closeSubpath();
    148             }
    149             break;
    150         case Circle:
    151             if (m_coords.size() >= 3) {
    152                 Length radius = m_coords[2];
    153                 float r = std::min(minimumValueForLength(radius, width).toFloat(), minimumValueForLength(radius, height).toFloat());
    154                 path.addEllipse(FloatRect(minimumValueForLength(m_coords[0], width).toFloat() - r, minimumValueForLength(m_coords[1], height).toFloat() - r, 2 * r, 2 * r));
    155             }
    156             break;
    157         case Rect:
    158             if (m_coords.size() >= 4) {
    159                 float x0 = minimumValueForLength(m_coords[0], width).toFloat();
    160                 float y0 = minimumValueForLength(m_coords[1], height).toFloat();
    161                 float x1 = minimumValueForLength(m_coords[2], width).toFloat();
    162                 float y1 = minimumValueForLength(m_coords[3], height).toFloat();
    163                 path.addRect(FloatRect(x0, y0, x1 - x0, y1 - y0));
    164             }
    165             break;
    166         case Default:
    167             path.addRect(FloatRect(0, 0, width.toFloat(), height.toFloat()));
    168             break;
    169         case Unknown:
    170             break;
    171     }
    172 
    173     return path;
    174 }
    175 
    176 HTMLImageElement* HTMLAreaElement::imageElement() const
    177 {
    178     Element* mapElement = parentElement();
    179     while (mapElement && !isHTMLMapElement(*mapElement))
    180         mapElement = mapElement->parentElement();
    181 
    182     if (!mapElement)
    183         return 0;
    184 
    185     return toHTMLMapElement(*mapElement).imageElement();
    186 }
    187 
    188 bool HTMLAreaElement::isKeyboardFocusable() const
    189 {
    190     return isFocusable();
    191 }
    192 
    193 bool HTMLAreaElement::isMouseFocusable() const
    194 {
    195     return isFocusable();
    196 }
    197 
    198 bool HTMLAreaElement::rendererIsFocusable() const
    199 {
    200     HTMLImageElement* image = imageElement();
    201     if (!image || !image->renderer() || image->renderer()->style()->visibility() != VISIBLE)
    202         return false;
    203 
    204     return supportsFocus() && Element::tabIndex() >= 0;
    205 }
    206 
    207 void HTMLAreaElement::setFocus(bool shouldBeFocused)
    208 {
    209     if (focused() == shouldBeFocused)
    210         return;
    211 
    212     HTMLAnchorElement::setFocus(shouldBeFocused);
    213 
    214     HTMLImageElement* imageElement = this->imageElement();
    215     if (!imageElement)
    216         return;
    217 
    218     RenderObject* renderer = imageElement->renderer();
    219     if (!renderer || !renderer->isImage())
    220         return;
    221 
    222     toRenderImage(renderer)->areaElementFocusChanged(this);
    223 }
    224 
    225 void HTMLAreaElement::updateFocusAppearance(bool restorePreviousSelection)
    226 {
    227     if (!isFocusable())
    228         return;
    229 
    230     HTMLImageElement* imageElement = this->imageElement();
    231     if (!imageElement)
    232         return;
    233 
    234     imageElement->updateFocusAppearance(restorePreviousSelection);
    235 }
    236 
    237 }
    238