1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Copyright (c) 2012 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 "chrome/browser/ui/tabs/hover_tab_selector.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
HoverTabSelector::HoverTabSelector(
TabStripModel* tab_strip_model)
: tab_strip_model_(tab_strip_model),
tab_transition_tab_index_(-1),
weak_factory_(this) {
DCHECK(tab_strip_model_);
}
HoverTabSelector::~HoverTabSelector() {
}
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::TimeDelta::FromMilliseconds(500);
tab_transition_tab_index_ = index;
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE, base::Bind(&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_, true);
}
|
