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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/resize_observer/resize_observation.h"
#include "third_party/blink/renderer/core/layout/layout_box.h"
#include "third_party/blink/renderer/core/resize_observer/resize_observer.h"
#include "third_party/blink/renderer/core/svg/svg_element.h"
#include "third_party/blink/renderer/core/svg/svg_graphics_element.h"
namespace blink {
ResizeObservation::ResizeObservation(Element* target, ResizeObserver* observer)
: target_(target),
observer_(observer),
observation_size_(0, 0),
element_size_changed_(true) {
DCHECK(target_);
observer_->ElementSizeChanged();
}
bool ResizeObservation::ObservationSizeOutOfSync() {
return element_size_changed_ && observation_size_ != ComputeTargetSize();
}
void ResizeObservation::SetObservationSize(const LayoutSize& observation_size) {
observation_size_ = observation_size;
element_size_changed_ = false;
}
size_t ResizeObservation::TargetDepth() {
unsigned depth = 0;
for (Element* parent = target_; parent; parent = parent->parentElement())
++depth;
return depth;
}
LayoutSize ResizeObservation::ComputeTargetSize() const {
if (target_) {
if (LayoutObject* layout_object = target_->GetLayoutObject()) {
if (auto* svg_graphics_element =
DynamicTo<SVGGraphicsElement>(target_.Get())) {
return LayoutSize(svg_graphics_element->GetBBox().Size());
}
if (layout_object->IsBox())
return ToLayoutBox(layout_object)->ContentSize();
}
}
return LayoutSize();
}
LayoutPoint ResizeObservation::ComputeTargetLocation() const {
if (target_ && !target_->IsSVGElement()) {
if (LayoutBox* layout = target_->GetLayoutBox())
return LayoutPoint(layout->PaddingLeft(), layout->PaddingTop());
}
return LayoutPoint();
}
void ResizeObservation::ElementSizeChanged() {
element_size_changed_ = true;
observer_->ElementSizeChanged();
}
void ResizeObservation::Trace(blink::Visitor* visitor) {
visitor->Trace(target_);
visitor->Trace(observer_);
}
} // namespace blink
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