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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 "third_party/blink/renderer/core/html/html_area_element.h"
#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/html/html_image_element.h"
#include "third_party/blink/renderer/core/html/html_map_element.h"
#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/core/layout/hit_test_result.h"
#include "third_party/blink/renderer/core/layout/layout_image.h"
#include "third_party/blink/renderer/platform/graphics/path.h"
#include "third_party/blink/renderer/platform/transforms/affine_transform.h"
namespace blink {
namespace {
// Adapt a double to the allowed range of a LayoutUnit and narrow it to float
// precision.
float ClampCoordinate(double value) {
return LayoutUnit(value).ToFloat();
}
}
HTMLAreaElement::HTMLAreaElement(Document& document)
: HTMLAnchorElement(html_names::kAreaTag, document), shape_(kRect) {}
// An explicit empty destructor should be in html_area_element.cc, because
// if an implicit destructor is used or an empty destructor is defined in
// html_area_element.h, when including html_area_element.h, msvc tries to expand
// the destructor and causes a compile error because of lack of blink::Path
// definition.
HTMLAreaElement::~HTMLAreaElement() = default;
void HTMLAreaElement::ParseAttribute(
const AttributeModificationParams& params) {
const AtomicString& value = params.new_value;
if (params.name == html_names::kShapeAttr) {
if (EqualIgnoringASCIICase(value, "default")) {
shape_ = kDefault;
} else if (EqualIgnoringASCIICase(value, "circle") ||
EqualIgnoringASCIICase(value, "circ")) {
shape_ = kCircle;
} else if (EqualIgnoringASCIICase(value, "polygon") ||
EqualIgnoringASCIICase(value, "poly")) {
shape_ = kPoly;
} else {
// The missing (and implicitly invalid) value default for the
// 'shape' attribute is 'rect'.
shape_ = kRect;
}
InvalidateCachedPath();
} else if (params.name == html_names::kCoordsAttr) {
coords_ = ParseHTMLListOfFloatingPointNumbers(value.GetString());
InvalidateCachedPath();
} else if (params.name == html_names::kAltAttr ||
params.name == html_names::kAccesskeyAttr) {
// Do nothing.
} else {
HTMLAnchorElement::ParseAttribute(params);
}
}
void HTMLAreaElement::InvalidateCachedPath() {
path_ = nullptr;
}
bool HTMLAreaElement::PointInArea(const PhysicalOffset& location,
const LayoutObject* container_object) const {
return GetPath(container_object).Contains(FloatPoint(location));
}
PhysicalRect HTMLAreaElement::ComputeAbsoluteRect(
const LayoutObject* container_object) const {
if (!container_object)
return PhysicalRect();
// FIXME: This doesn't work correctly with transforms.
PhysicalOffset abs_pos = container_object->LocalToAbsolutePoint(
PhysicalOffset(), kIgnoreTransforms);
Path path = GetPath(container_object);
path.Translate(FloatSize(abs_pos));
return PhysicalRect::EnclosingRect(path.BoundingRect());
}
Path HTMLAreaElement::GetPath(const LayoutObject* container_object) const {
if (!container_object)
return Path();
// Always recompute for default shape because it depends on container object's
// size and is cheap.
if (shape_ == kDefault) {
Path path;
// No need to zoom because it is already applied in
// containerObject->borderBoxRect().
if (container_object->IsBox())
path.AddRect(FloatRect(ToLayoutBox(container_object)->BorderBoxRect()));
path_ = nullptr;
return path;
}
Path path;
if (path_) {
path = *path_;
} else {
if (coords_.IsEmpty())
return path;
switch (shape_) {
case kPoly:
if (coords_.size() >= 6) {
int num_points = coords_.size() / 2;
path.MoveTo(FloatPoint(ClampCoordinate(coords_[0]),
ClampCoordinate(coords_[1])));
for (int i = 1; i < num_points; ++i)
path.AddLineTo(FloatPoint(ClampCoordinate(coords_[i * 2]),
ClampCoordinate(coords_[i * 2 + 1])));
path.CloseSubpath();
path.SetWindRule(RULE_EVENODD);
}
break;
case kCircle:
if (coords_.size() >= 3 && coords_[2] > 0) {
float r = ClampCoordinate(coords_[2]);
path.AddEllipse(FloatRect(ClampCoordinate(coords_[0]) - r,
ClampCoordinate(coords_[1]) - r, 2 * r,
2 * r));
}
break;
case kRect:
if (coords_.size() >= 4) {
float x0 = ClampCoordinate(coords_[0]);
float y0 = ClampCoordinate(coords_[1]);
float x1 = ClampCoordinate(coords_[2]);
float y1 = ClampCoordinate(coords_[3]);
path.AddRect(FloatRect(x0, y0, x1 - x0, y1 - y0));
}
break;
default:
NOTREACHED();
break;
}
// Cache the original path, not depending on containerObject.
path_ = std::make_unique<Path>(path);
}
// Zoom the path into coordinates of the container object.
float zoom_factor = container_object->StyleRef().EffectiveZoom();
if (zoom_factor != 1.0f) {
AffineTransform zoom_transform;
zoom_transform.Scale(zoom_factor);
path.Transform(zoom_transform);
}
return path;
}
HTMLImageElement* HTMLAreaElement::ImageElement() const {
if (HTMLMapElement* map_element =
Traversal<HTMLMapElement>::FirstAncestor(*this))
return map_element->ImageElement();
return nullptr;
}
bool HTMLAreaElement::IsKeyboardFocusable() const {
return IsFocusable();
}
bool HTMLAreaElement::IsMouseFocusable() const {
return IsFocusable();
}
bool HTMLAreaElement::IsFocusableStyle() const {
HTMLImageElement* image = ImageElement();
if (!image || !image->GetLayoutObject() ||
image->GetLayoutObject()->Style()->Visibility() != EVisibility::kVisible)
return false;
return SupportsFocus() && Element::tabIndex() >= 0;
}
void HTMLAreaElement::SetFocused(bool should_be_focused,
mojom::blink::FocusType focus_type) {
if (IsFocused() == should_be_focused)
return;
HTMLAnchorElement::SetFocused(should_be_focused, focus_type);
HTMLImageElement* image_element = ImageElement();
if (!image_element)
return;
LayoutObject* layout_object = image_element->GetLayoutObject();
if (!layout_object || !layout_object->IsImage())
return;
ToLayoutImage(layout_object)->AreaElementFocusChanged(this);
}
void HTMLAreaElement::UpdateFocusAppearanceWithOptions(
SelectionBehaviorOnFocus selection_behavior,
const FocusOptions* options) {
GetDocument().UpdateStyleAndLayoutTreeForNode(this);
if (!IsFocusable())
return;
if (HTMLImageElement* image_element = ImageElement()) {
image_element->UpdateFocusAppearanceWithOptions(selection_behavior,
options);
}
}
} // namespace blink
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