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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2004, 2005, 2006, 2009, 2011 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "core/html/HTMLAreaElement.h"
#include "HTMLNames.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/HTMLMapElement.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/RenderImage.h"
#include "core/rendering/RenderView.h"
#include "platform/graphics/Path.h"
#include "platform/transforms/AffineTransform.h"
using namespace std;
namespace WebCore {
using namespace HTMLNames;
inline HTMLAreaElement::HTMLAreaElement(Document& document)
: HTMLAnchorElement(areaTag, document)
, m_lastSize(-1, -1)
, m_shape(Unknown)
{
ScriptWrappable::init(this);
}
PassRefPtr<HTMLAreaElement> HTMLAreaElement::create(Document& document)
{
return adoptRef(new HTMLAreaElement(document));
}
void HTMLAreaElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == shapeAttr) {
if (equalIgnoringCase(value, "default"))
m_shape = Default;
else if (equalIgnoringCase(value, "circle"))
m_shape = Circle;
else if (equalIgnoringCase(value, "poly"))
m_shape = Poly;
else if (equalIgnoringCase(value, "rect"))
m_shape = Rect;
invalidateCachedRegion();
} else if (name == coordsAttr) {
m_coords = parseHTMLAreaElementCoords(value.string());
invalidateCachedRegion();
} else if (name == altAttr || name == accesskeyAttr) {
// Do nothing.
} else
HTMLAnchorElement::parseAttribute(name, value);
}
void HTMLAreaElement::invalidateCachedRegion()
{
m_lastSize = LayoutSize(-1, -1);
}
bool HTMLAreaElement::mapMouseEvent(LayoutPoint location, const LayoutSize& size, HitTestResult& result)
{
if (m_lastSize != size) {
m_region = adoptPtr(new Path(getRegion(size)));
m_lastSize = size;
}
if (!m_region->contains(location))
return false;
result.setInnerNode(this);
result.setURLElement(this);
return true;
}
Path HTMLAreaElement::computePath(RenderObject* obj) const
{
if (!obj)
return Path();
// FIXME: This doesn't work correctly with transforms.
FloatPoint absPos = obj->localToAbsolute();
// Default should default to the size of the containing object.
LayoutSize size = m_lastSize;
if (m_shape == Default)
size = obj->absoluteOutlineBounds().size();
Path p = getRegion(size);
float zoomFactor = obj->style()->effectiveZoom();
if (zoomFactor != 1.0f) {
AffineTransform zoomTransform;
zoomTransform.scale(zoomFactor);
p.transform(zoomTransform);
}
p.translate(toFloatSize(absPos));
return p;
}
LayoutRect HTMLAreaElement::computeRect(RenderObject* obj) const
{
return enclosingLayoutRect(computePath(obj).boundingRect());
}
Path HTMLAreaElement::getRegion(const LayoutSize& size) const
{
if (m_coords.isEmpty() && m_shape != Default)
return Path();
LayoutUnit width = size.width();
LayoutUnit height = size.height();
// If element omits the shape attribute, select shape based on number of coordinates.
Shape shape = m_shape;
if (shape == Unknown) {
if (m_coords.size() == 3)
shape = Circle;
else if (m_coords.size() == 4)
shape = Rect;
else if (m_coords.size() >= 6)
shape = Poly;
}
Path path;
RenderView* renderView = document().renderView();
switch (shape) {
case Poly:
if (m_coords.size() >= 6) {
int numPoints = m_coords.size() / 2;
path.moveTo(FloatPoint(minimumValueForLength(m_coords[0], width, renderView), minimumValueForLength(m_coords[1], height, renderView)));
for (int i = 1; i < numPoints; ++i)
path.addLineTo(FloatPoint(minimumValueForLength(m_coords[i * 2], width, renderView), minimumValueForLength(m_coords[i * 2 + 1], height, renderView)));
path.closeSubpath();
}
break;
case Circle:
if (m_coords.size() >= 3) {
Length radius = m_coords[2];
int r = min(minimumValueForLength(radius, width, renderView), minimumValueForLength(radius, height, renderView));
path.addEllipse(FloatRect(minimumValueForLength(m_coords[0], width, renderView) - r, minimumValueForLength(m_coords[1], height, renderView) - r, 2 * r, 2 * r));
}
break;
case Rect:
if (m_coords.size() >= 4) {
int x0 = minimumValueForLength(m_coords[0], width, renderView);
int y0 = minimumValueForLength(m_coords[1], height, renderView);
int x1 = minimumValueForLength(m_coords[2], width, renderView);
int y1 = minimumValueForLength(m_coords[3], height, renderView);
path.addRect(FloatRect(x0, y0, x1 - x0, y1 - y0));
}
break;
case Default:
path.addRect(FloatRect(0, 0, width, height));
break;
case Unknown:
break;
}
return path;
}
HTMLImageElement* HTMLAreaElement::imageElement() const
{
Element* mapElement = parentElement();
while (mapElement && !mapElement->hasTagName(mapTag))
mapElement = mapElement->parentElement();
if (!mapElement)
return 0;
return toHTMLMapElement(mapElement)->imageElement();
}
bool HTMLAreaElement::isKeyboardFocusable() const
{
return isFocusable();
}
bool HTMLAreaElement::isMouseFocusable() const
{
return isFocusable();
}
bool HTMLAreaElement::rendererIsFocusable() const
{
HTMLImageElement* image = imageElement();
if (!image || !image->renderer() || image->renderer()->style()->visibility() != VISIBLE)
return false;
return supportsFocus() && Element::tabIndex() >= 0;
}
void HTMLAreaElement::setFocus(bool shouldBeFocused)
{
if (focused() == shouldBeFocused)
return;
HTMLAnchorElement::setFocus(shouldBeFocused);
HTMLImageElement* imageElement = this->imageElement();
if (!imageElement)
return;
RenderObject* renderer = imageElement->renderer();
if (!renderer || !renderer->isImage())
return;
toRenderImage(renderer)->areaElementFocusChanged(this);
}
void HTMLAreaElement::updateFocusAppearance(bool restorePreviousSelection)
{
if (!isFocusable())
return;
HTMLImageElement* imageElement = this->imageElement();
if (!imageElement)
return;
imageElement->updateFocusAppearance(restorePreviousSelection);
}
bool HTMLAreaElement::supportsFocus() const
{
// If the AREA element was a link, it should support focus.
// FIXME: This means that an AREA that is not a link cannot be made focusable through contenteditable or tabindex. Is it correct?
return isLink();
}
String HTMLAreaElement::target() const
{
return getAttribute(targetAttr);
}
}
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