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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_observer_controller.h"
#include "third_party/blink/renderer/core/resize_observer/resize_observer.h"
namespace blink {
ResizeObserverController::ResizeObserverController()
: observers_changed_(false) {}
void ResizeObserverController::AddObserver(ResizeObserver& observer) {
observers_.insert(&observer);
}
size_t ResizeObserverController::GatherObservations(size_t deeper_than) {
size_t shallowest = ResizeObserverController::kDepthBottom;
if (!observers_changed_)
return shallowest;
for (auto& observer : observers_) {
size_t depth = observer->GatherObservations(deeper_than);
if (depth < shallowest)
shallowest = depth;
}
return shallowest;
}
void ResizeObserverController::SetNeedsForcedResizeObservations() {
for (auto& observer : observers_) {
// Set ElementSizeChanged as a way of forcing the observer to check all
// observations.
observer->ElementSizeChanged();
}
}
bool ResizeObserverController::SkippedObservations() {
for (auto& observer : observers_) {
if (observer->SkippedObservations())
return true;
}
return false;
}
void ResizeObserverController::DeliverObservations() {
observers_changed_ = false;
// Copy is needed because m_observers might get modified during
// deliverObservations.
HeapVector<Member<ResizeObserver>> observers;
CopyToVector(observers_, observers);
for (auto& observer : observers) {
if (observer) {
observer->DeliverObservations();
observers_changed_ =
observers_changed_ || observer->HasElementSizeChanged();
}
}
}
void ResizeObserverController::ClearObservations() {
for (auto& observer : observers_)
observer->ClearObservations();
}
void ResizeObserverController::Trace(blink::Visitor* visitor) {
visitor->Trace(observers_);
}
} // namespace blink
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