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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/thumbnails/thumbnail_readiness_tracker.h"
#include <utility>
#include "content/public/browser/navigation_handle.h"
namespace {
bool NavigationShouldInvalidateThumbnail(
content::NavigationHandle* navigation) {
// Ignore subframe navigations.
if (!navigation->IsInPrimaryMainFrame()) {
return false;
}
// Some navigations change the tab URL but don't create a new
// document. They aren't considered loading; onload is never triggered
// after they complete. They shouldn't affect the thumbnail.
//
// See crbug.com/1120940 for why this is necessary.
if (navigation->IsSameDocument()) {
return false;
}
return true;
}
} // namespace
ThumbnailReadinessTracker::ThumbnailReadinessTracker(
content::WebContents* web_contents,
ReadinessChangeCallback callback)
: content::WebContentsObserver(web_contents),
callback_(std::move(callback)) {
DCHECK(callback_);
}
ThumbnailReadinessTracker::~ThumbnailReadinessTracker() = default;
void ThumbnailReadinessTracker::DidStartNavigation(
content::NavigationHandle* navigation_handle) {
if (!NavigationShouldInvalidateThumbnail(navigation_handle)) {
return;
}
pending_navigation_ = navigation_handle;
UpdateReadiness(Readiness::kNotReady);
}
void ThumbnailReadinessTracker::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
// Only respond to the last navigation handled by DidStartNavigation.
// Others may be unimportant or outdated.
if (navigation_handle != pending_navigation_) {
return;
}
pending_navigation_ = nullptr;
UpdateReadiness(Readiness::kReadyForInitialCapture);
if (last_readiness_ > Readiness::kReadyForInitialCapture) {
return;
}
UpdateReadiness(Readiness::kReadyForInitialCapture);
}
void ThumbnailReadinessTracker::DocumentOnLoadCompletedInPrimaryMainFrame() {
UpdateReadiness(Readiness::kReadyForFinalCapture);
}
void ThumbnailReadinessTracker::WebContentsDestroyed() {
pending_navigation_ = nullptr;
UpdateReadiness(Readiness::kNotReady);
}
void ThumbnailReadinessTracker::WasDiscarded() {
// A new ThumbnailTabHelper and its associated tracker is created every time
// a new tab WebContents is created. A new tracker starts at the kNotReady
// state. Set this explicitly during discard to reset readiness for the new
// discard implementation that retains the tab's WebContents (and consequently
// does not recreate the tab helper).
UpdateReadiness(Readiness::kNotReady);
}
void ThumbnailReadinessTracker::UpdateReadiness(Readiness readiness) {
if (readiness == last_readiness_) {
return;
}
// If the WebContents is closing, it shouldn't be captured.
if (web_contents()->IsBeingDestroyed()) {
readiness = Readiness::kNotReady;
}
last_readiness_ = readiness;
callback_.Run(readiness);
}
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