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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
// 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/zoom/zoom_controller.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/tab_contents/tab_contents.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/page_zoom.h"
ZoomController::ZoomController(TabContents* tab_contents)
: content::WebContentsObserver(tab_contents->web_contents()),
zoom_icon_state_(NONE),
zoom_percent_(100),
tab_contents_(tab_contents),
observer_(NULL) {
default_zoom_level_.Init(prefs::kDefaultZoomLevel,
tab_contents->profile()->GetPrefs(), this);
registrar_.Add(this, content::NOTIFICATION_ZOOM_LEVEL_CHANGED,
content::NotificationService::AllBrowserContextsAndSources());
UpdateState();
}
ZoomController::~ZoomController() {
default_zoom_level_.Destroy();
registrar_.RemoveAll();
}
void ZoomController::DidNavigateMainFrame(
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) {
// If the main frame's content has changed, the new page may have a different
// zoom level from the old one.
UpdateState();
}
void ZoomController::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
switch (type) {
case chrome::NOTIFICATION_PREF_CHANGED: {
std::string* pref_name = content::Details<std::string>(details).ptr();
DCHECK(pref_name && *pref_name == prefs::kDefaultZoomLevel);
}
// Fall through.
case content::NOTIFICATION_ZOOM_LEVEL_CHANGED:
UpdateState();
break;
default:
NOTREACHED();
}
}
void ZoomController::UpdateState() {
double current_zoom_level = tab_contents_->web_contents()->GetZoomLevel();
double default_zoom_level = default_zoom_level_.GetValue();
ZoomIconState state;
if (content::ZoomValuesEqual(current_zoom_level, default_zoom_level))
state = NONE;
else if (current_zoom_level > default_zoom_level)
state = ZOOM_PLUS_ICON;
else
state = ZOOM_MINUS_ICON;
bool dummy;
int zoom_percent = tab_contents_->web_contents()->
GetZoomPercent(&dummy, &dummy);
if (state != zoom_icon_state_) {
zoom_icon_state_ = state;
if (observer_)
observer_->OnZoomIconChanged(tab_contents_, state);
}
if (zoom_percent != zoom_percent_) {
zoom_percent_ = zoom_percent;
if (observer_)
observer_->OnZoomChanged(tab_contents_,
zoom_percent,
state != NONE);
}
}
|
