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// Copyright 2024 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/renderer/web_link_preview_triggerer_impl.h"
#include "base/functional/bind.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/input/web_input_event.h"
#include "third_party/blink/public/platform/web_url.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_element.h"
namespace {
constexpr base::TimeDelta kHoverThreshold = base::Milliseconds(800);
// TODO(crbug.com/330196622):
// Use ui::GestureConfiguration()->long_press_time_ms() here.
constexpr base::TimeDelta kLongPressThreshold = base::Milliseconds(800);
blink::WebURL GetURL(blink::WebElement& anchor_element) {
if (anchor_element.IsNull()) {
return blink::WebURL();
}
blink::WebString href = anchor_element.GetAttribute("href");
if (href.IsNull()) {
return blink::WebURL();
}
// TODO(b:325558426): Mimic HTMLAnchorElement::Href and
// StripLeadingAndTrailingHTMLSpaces.
blink::WebURL url = anchor_element.GetDocument().CompleteURL(href);
if (!url.IsValid()) {
return blink::WebURL();
}
return url;
}
blink::WebElement GetMostInnerAnchorElement(blink::WebElement element) {
blink::WebElement most_inner_anchor_element;
for (blink::WebNode curr = element; !curr.IsNull() && curr.IsElementNode();
curr = curr.ParentNode()) {
blink::WebElement curr_as_element = curr.To<blink::WebElement>();
if (curr_as_element.HasHTMLTagName("a")) {
most_inner_anchor_element = curr_as_element;
break;
}
}
return most_inner_anchor_element;
}
} // namespace
std::unique_ptr<blink::WebLinkPreviewTriggerer>
CreateWebLinkPreviewTriggerer() {
if (!base::FeatureList::IsEnabled(blink::features::kLinkPreview)) {
return nullptr;
}
switch (blink::features::kLinkPreviewTriggerType.Get()) {
// Alt+click is handled by navigation policy.
case blink::features::LinkPreviewTriggerType::kAltClick:
return nullptr;
case blink::features::LinkPreviewTriggerType::kAltHover:
return std::make_unique<WebLinkPreviewTriggererAltHover>();
case blink::features::LinkPreviewTriggerType::kLongPress:
return std::make_unique<WebLinkPreviewTriggererLongPress>();
}
}
WebLinkPreviewTriggererAltHover::WebLinkPreviewTriggererAltHover()
: timer_(std::make_unique<base::OneShotTimer>()) {}
WebLinkPreviewTriggererAltHover::~WebLinkPreviewTriggererAltHover() = default;
WebLinkPreviewTriggererAltHover::WebLinkPreviewTriggererAltHover(
WebLinkPreviewTriggererAltHover&& other) = default;
WebLinkPreviewTriggererAltHover& WebLinkPreviewTriggererAltHover::operator=(
WebLinkPreviewTriggererAltHover&& other) = default;
void WebLinkPreviewTriggererAltHover::MaybeChangedKeyEventModifier(
int modifiers) {
bool is_alt_on = (modifiers & blink::WebInputEvent::kAltKey) != 0;
UpdateState(is_alt_on, anchor_element_);
}
void WebLinkPreviewTriggererAltHover::DidChangeHoverElement(
blink::WebElement element) {
UpdateState(is_alt_on_, GetMostInnerAnchorElement(element));
}
void WebLinkPreviewTriggererAltHover::UpdateState(
bool is_alt_on,
blink::WebElement anchor_element) {
if (is_alt_on_ == is_alt_on && anchor_element_ == anchor_element) {
return;
}
is_alt_on_ = is_alt_on;
anchor_element_ = anchor_element;
if (is_alt_on_ && !GetURL(anchor_element).IsNull()) {
timer_->Start(
FROM_HERE, kHoverThreshold,
base::BindOnce(&WebLinkPreviewTriggererAltHover::InitiatePreview,
// base::Unretained() is safe since `this` owns `timer_`.
base::Unretained(this)));
} else {
timer_->Stop();
}
}
void WebLinkPreviewTriggererAltHover::InitiatePreview() {
blink::WebDocument document = anchor_element_.GetDocument();
if (document.IsNull()) {
return;
}
blink::WebURL url = GetURL(anchor_element_);
if (url.IsNull()) {
return;
}
document.InitiatePreview(url);
}
WebLinkPreviewTriggererLongPress::WebLinkPreviewTriggererLongPress()
: timer_(std::make_unique<base::OneShotTimer>()) {}
WebLinkPreviewTriggererLongPress::~WebLinkPreviewTriggererLongPress() = default;
WebLinkPreviewTriggererLongPress::WebLinkPreviewTriggererLongPress(
WebLinkPreviewTriggererLongPress&& other) = default;
WebLinkPreviewTriggererLongPress& WebLinkPreviewTriggererLongPress::operator=(
WebLinkPreviewTriggererLongPress&& other) = default;
void WebLinkPreviewTriggererLongPress::DidChangeHoverElement(
blink::WebElement element) {
CHECK(!timer_->IsRunning() || !anchor_element_.IsNull());
if (GetMostInnerAnchorElement(element) != anchor_element_) {
timer_->Stop();
anchor_element_.Reset();
}
}
void WebLinkPreviewTriggererLongPress::DidAnchorElementReceiveMouseDownEvent(
blink::WebElement anchor_element,
blink::WebMouseEvent::Button button,
int click_count) {
CHECK(!timer_->IsRunning() || !anchor_element_.IsNull());
timer_->Stop();
anchor_element_.Reset();
if (button == blink::WebMouseEvent::Button::kLeft && click_count == 1) {
anchor_element_ = anchor_element;
timer_->Start(
FROM_HERE, kLongPressThreshold,
base::BindOnce(&WebLinkPreviewTriggererLongPress::InitiatePreview,
// base::Unretained() is safe since `this` owns `timer_`.
base::Unretained(this)));
}
}
void WebLinkPreviewTriggererLongPress::DidAnchorElementReceiveMouseUpEvent(
blink::WebElement anchor_element,
blink::WebMouseEvent::Button button,
int click_count) {
CHECK(!timer_->IsRunning() || !anchor_element_.IsNull());
timer_->Stop();
anchor_element_.Reset();
}
void WebLinkPreviewTriggererLongPress::InitiatePreview() {
blink::WebDocument document = anchor_element_.GetDocument();
blink::WebURL url = GetURL(anchor_element_);
anchor_element_.Reset();
if (document.IsNull() || url.IsNull()) {
return;
}
document.InitiatePreview(url);
}
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