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// Copyright 2012 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/tabs/hover_tab_selector.h"
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/task/single_thread_task_runner.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/browser/ui/tabs/tab_strip_user_gesture_details.h"
HoverTabSelector::HoverTabSelector(TabStripModel* tab_strip_model)
: tab_strip_model_(tab_strip_model), tab_transition_tab_index_(-1) {
DCHECK(tab_strip_model_);
}
HoverTabSelector::~HoverTabSelector() = default;
void HoverTabSelector::StartTabTransition(int index) {
// If there is a transition underway already, only start a new
// transition (canceling the old one) if the target tab differs.
if (weak_factory_.HasWeakPtrs()) {
if (index == tab_transition_tab_index_) {
return;
}
CancelTabTransition();
}
// Start a new transition if the target isn't active already.
if (index != tab_strip_model_->active_index()) {
// The delay between beginning to hover over a tab and the transition
// to that tab taking place.
const base::TimeDelta kHoverTransitionDelay = base::Milliseconds(500);
tab_transition_tab_index_ = index;
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&HoverTabSelector::PerformTabTransition,
weak_factory_.GetWeakPtr()),
kHoverTransitionDelay);
}
}
void HoverTabSelector::CancelTabTransition() {
weak_factory_.InvalidateWeakPtrs();
}
void HoverTabSelector::PerformTabTransition() {
DCHECK(tab_transition_tab_index_ >= 0 &&
tab_transition_tab_index_ < tab_strip_model_->count());
tab_strip_model_->ActivateTabAt(
tab_transition_tab_index_,
TabStripUserGestureDetails(
TabStripUserGestureDetails::GestureType::kOther));
}
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