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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 "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/graphics/Path.h"
     32 #include "platform/transforms/AffineTransform.h"
     33 
     34 using namespace std;
     35 
     36 namespace WebCore {
     37 
     38 using namespace HTMLNames;
     39 
     40 inline HTMLAreaElement::HTMLAreaElement(Document& document)
     41     : HTMLAnchorElement(areaTag, document)
     42     , m_lastSize(-1, -1)
     43     , m_shape(Unknown)
     44 {
     45     ScriptWrappable::init(this);
     46 }
     47 
     48 PassRefPtr<HTMLAreaElement> HTMLAreaElement::create(Document& document)
     49 {
     50     return adoptRef(new HTMLAreaElement(document));
     51 }
     52 
     53 void HTMLAreaElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     54 {
     55     if (name == shapeAttr) {
     56         if (equalIgnoringCase(value, "default"))
     57             m_shape = Default;
     58         else if (equalIgnoringCase(value, "circle"))
     59             m_shape = Circle;
     60         else if (equalIgnoringCase(value, "poly"))
     61             m_shape = Poly;
     62         else if (equalIgnoringCase(value, "rect"))
     63             m_shape = Rect;
     64         invalidateCachedRegion();
     65     } else if (name == coordsAttr) {
     66         m_coords = parseHTMLAreaElementCoords(value.string());
     67         invalidateCachedRegion();
     68     } else if (name == altAttr || name == accesskeyAttr) {
     69         // Do nothing.
     70     } else
     71         HTMLAnchorElement::parseAttribute(name, value);
     72 }
     73 
     74 void HTMLAreaElement::invalidateCachedRegion()
     75 {
     76     m_lastSize = LayoutSize(-1, -1);
     77 }
     78 
     79 bool HTMLAreaElement::mapMouseEvent(LayoutPoint location, const LayoutSize& size, HitTestResult& result)
     80 {
     81     if (m_lastSize != size) {
     82         m_region = adoptPtr(new Path(getRegion(size)));
     83         m_lastSize = size;
     84     }
     85 
     86     if (!m_region->contains(location))
     87         return false;
     88 
     89     result.setInnerNode(this);
     90     result.setURLElement(this);
     91     return true;
     92 }
     93 
     94 Path HTMLAreaElement::computePath(RenderObject* obj) const
     95 {
     96     if (!obj)
     97         return Path();
     98 
     99     // FIXME: This doesn't work correctly with transforms.
    100     FloatPoint absPos = obj->localToAbsolute();
    101 
    102     // Default should default to the size of the containing object.
    103     LayoutSize size = m_lastSize;
    104     if (m_shape == Default)
    105         size = obj->absoluteOutlineBounds().size();
    106 
    107     Path p = getRegion(size);
    108     float zoomFactor = obj->style()->effectiveZoom();
    109     if (zoomFactor != 1.0f) {
    110         AffineTransform zoomTransform;
    111         zoomTransform.scale(zoomFactor);
    112         p.transform(zoomTransform);
    113     }
    114 
    115     p.translate(toFloatSize(absPos));
    116     return p;
    117 }
    118 
    119 LayoutRect HTMLAreaElement::computeRect(RenderObject* obj) const
    120 {
    121     return enclosingLayoutRect(computePath(obj).boundingRect());
    122 }
    123 
    124 Path HTMLAreaElement::getRegion(const LayoutSize& size) const
    125 {
    126     if (m_coords.isEmpty() && m_shape != Default)
    127         return Path();
    128 
    129     LayoutUnit width = size.width();
    130     LayoutUnit height = size.height();
    131 
    132     // If element omits the shape attribute, select shape based on number of coordinates.
    133     Shape shape = m_shape;
    134     if (shape == Unknown) {
    135         if (m_coords.size() == 3)
    136             shape = Circle;
    137         else if (m_coords.size() == 4)
    138             shape = Rect;
    139         else if (m_coords.size() >= 6)
    140             shape = Poly;
    141     }
    142 
    143     Path path;
    144     RenderView* renderView = document().renderView();
    145     switch (shape) {
    146         case Poly:
    147             if (m_coords.size() >= 6) {
    148                 int numPoints = m_coords.size() / 2;
    149                 path.moveTo(FloatPoint(minimumValueForLength(m_coords[0], width, renderView), minimumValueForLength(m_coords[1], height, renderView)));
    150                 for (int i = 1; i < numPoints; ++i)
    151                     path.addLineTo(FloatPoint(minimumValueForLength(m_coords[i * 2], width, renderView), minimumValueForLength(m_coords[i * 2 + 1], height, renderView)));
    152                 path.closeSubpath();
    153             }
    154             break;
    155         case Circle:
    156             if (m_coords.size() >= 3) {
    157                 Length radius = m_coords[2];
    158                 int r = min(minimumValueForLength(radius, width, renderView), minimumValueForLength(radius, height, renderView));
    159                 path.addEllipse(FloatRect(minimumValueForLength(m_coords[0], width, renderView) - r, minimumValueForLength(m_coords[1], height, renderView) - r, 2 * r, 2 * r));
    160             }
    161             break;
    162         case Rect:
    163             if (m_coords.size() >= 4) {
    164                 int x0 = minimumValueForLength(m_coords[0], width, renderView);
    165                 int y0 = minimumValueForLength(m_coords[1], height, renderView);
    166                 int x1 = minimumValueForLength(m_coords[2], width, renderView);
    167                 int y1 = minimumValueForLength(m_coords[3], height, renderView);
    168                 path.addRect(FloatRect(x0, y0, x1 - x0, y1 - y0));
    169             }
    170             break;
    171         case Default:
    172             path.addRect(FloatRect(0, 0, width, height));
    173             break;
    174         case Unknown:
    175             break;
    176     }
    177 
    178     return path;
    179 }
    180 
    181 HTMLImageElement* HTMLAreaElement::imageElement() const
    182 {
    183     Element* mapElement = parentElement();
    184     while (mapElement && !mapElement->hasTagName(mapTag))
    185         mapElement = mapElement->parentElement();
    186 
    187     if (!mapElement)
    188         return 0;
    189 
    190     return toHTMLMapElement(mapElement)->imageElement();
    191 }
    192 
    193 bool HTMLAreaElement::isKeyboardFocusable() const
    194 {
    195     return isFocusable();
    196 }
    197 
    198 bool HTMLAreaElement::isMouseFocusable() const
    199 {
    200     return isFocusable();
    201 }
    202 
    203 bool HTMLAreaElement::rendererIsFocusable() const
    204 {
    205     HTMLImageElement* image = imageElement();
    206     if (!image || !image->renderer() || image->renderer()->style()->visibility() != VISIBLE)
    207         return false;
    208 
    209     return supportsFocus() && Element::tabIndex() >= 0;
    210 }
    211 
    212 void HTMLAreaElement::setFocus(bool shouldBeFocused)
    213 {
    214     if (focused() == shouldBeFocused)
    215         return;
    216 
    217     HTMLAnchorElement::setFocus(shouldBeFocused);
    218 
    219     HTMLImageElement* imageElement = this->imageElement();
    220     if (!imageElement)
    221         return;
    222 
    223     RenderObject* renderer = imageElement->renderer();
    224     if (!renderer || !renderer->isImage())
    225         return;
    226 
    227     toRenderImage(renderer)->areaElementFocusChanged(this);
    228 }
    229 
    230 void HTMLAreaElement::updateFocusAppearance(bool restorePreviousSelection)
    231 {
    232     if (!isFocusable())
    233         return;
    234 
    235     HTMLImageElement* imageElement = this->imageElement();
    236     if (!imageElement)
    237         return;
    238 
    239     imageElement->updateFocusAppearance(restorePreviousSelection);
    240 }
    241 
    242 bool HTMLAreaElement::supportsFocus() const
    243 {
    244     // If the AREA element was a link, it should support focus.
    245     // FIXME: This means that an AREA that is not a link cannot be made focusable through contenteditable or tabindex. Is it correct?
    246     return isLink();
    247 }
    248 
    249 String HTMLAreaElement::target() const
    250 {
    251     return getAttribute(targetAttr);
    252 }
    253 
    254 }
    255