1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "chrome/browser/ui/zoom/zoom_controller.h"
7 #include "chrome/browser/ui/sad_tab.h"
8 #include "chrome/browser/ui/zoom/zoom_event_manager.h"
9 #include "chrome/browser/ui/zoom/zoom_observer.h"
10 #include "content/public/browser/host_zoom_map.h"
11 #include "content/public/browser/navigation_details.h"
12 #include "content/public/browser/navigation_entry.h"
13 #include "content/public/browser/render_process_host.h"
14 #include "content/public/browser/render_view_host.h"
15 #include "content/public/browser/web_contents.h"
16 #include "content/public/common/page_type.h"
17 #include "content/public/common/page_zoom.h"
18 #include "extensions/common/extension.h"
19 #include "grit/theme_resources.h"
20 #include "net/base/net_util.h"
22 DEFINE_WEB_CONTENTS_USER_DATA_KEY(ZoomController);
24 ZoomController::ZoomController(content::WebContents* web_contents)
25 : content::WebContentsObserver(web_contents),
26 can_show_bubble_(true),
27 zoom_mode_(ZOOM_MODE_DEFAULT),
29 browser_context_(web_contents->GetBrowserContext()) {
30 // TODO(wjmaclean) Make calls to HostZoomMap::GetDefaultForBrowserContext()
31 // refer to the webcontents-specific HostZoomMap when that becomes available.
32 content::HostZoomMap* host_zoom_map =
33 content::HostZoomMap::GetDefaultForBrowserContext(browser_context_);
34 zoom_level_ = host_zoom_map->GetDefaultZoomLevel();
36 zoom_subscription_ = host_zoom_map->AddZoomLevelChangedCallback(
37 base::Bind(&ZoomController::OnZoomLevelChanged, base::Unretained(this)));
39 UpdateState(std::string());
42 ZoomController::~ZoomController() {}
44 bool ZoomController::IsAtDefaultZoom() const {
45 return content::ZoomValuesEqual(GetZoomLevel(), GetDefaultZoomLevel());
48 int ZoomController::GetResourceForZoomLevel() const {
49 if (IsAtDefaultZoom())
50 return IDR_ZOOM_NORMAL;
51 return GetZoomLevel() > GetDefaultZoomLevel() ? IDR_ZOOM_PLUS
55 void ZoomController::AddObserver(ZoomObserver* observer) {
56 observers_.AddObserver(observer);
59 void ZoomController::RemoveObserver(ZoomObserver* observer) {
60 observers_.RemoveObserver(observer);
63 double ZoomController::GetZoomLevel() const {
64 return zoom_mode_ == ZOOM_MODE_MANUAL ?
66 content::HostZoomMap::GetZoomLevel(web_contents());
69 int ZoomController::GetZoomPercent() const {
70 double zoom_factor = content::ZoomLevelToZoomFactor(GetZoomLevel());
71 // Round double for return.
72 return static_cast<int>(zoom_factor * 100 + 0.5);
75 bool ZoomController::SetZoomLevel(double zoom_level) {
76 // An extension did not initiate this zoom change.
77 return SetZoomLevelByExtension(zoom_level, NULL);
80 bool ZoomController::SetZoomLevelByExtension(
82 const scoped_refptr<const extensions::Extension>& extension) {
83 content::NavigationEntry* entry =
84 web_contents()->GetController().GetLastCommittedEntry();
85 // Cannot zoom in disabled mode. Also, don't allow changing zoom level on
86 // a crashed tab, an error page or an interstitial page.
87 if (zoom_mode_ == ZOOM_MODE_DISABLED ||
88 !web_contents()->GetRenderViewHost()->IsRenderViewLive())
91 // Store extension data so that |extension| can be attributed when the zoom
92 // change completes. We expect that by the time this function returns that
93 // any observers that require this information will have requested it.
94 last_extension_ = extension;
96 // Do not actually rescale the page in manual mode.
97 if (zoom_mode_ == ZOOM_MODE_MANUAL) {
98 double old_zoom_level = zoom_level_;
99 zoom_level_ = zoom_level;
101 // TODO(wjmaclean) Do we care about filling in host/scheme here?
102 content::HostZoomMap::ZoomLevelChange change;
103 change.mode = content::HostZoomMap::ZOOM_CHANGED_TEMPORARY_ZOOM;
104 change.zoom_level = zoom_level;
105 ZoomEventManager::GetForBrowserContext(browser_context_)->
106 OnZoomLevelChanged(change);
108 ZoomChangedEventData zoom_change_data(web_contents(),
112 false /* can_show_bubble */);
114 ZoomObserver, observers_, OnZoomChanged(zoom_change_data));
116 last_extension_ = NULL;
120 content::HostZoomMap* zoom_map =
121 content::HostZoomMap::GetDefaultForBrowserContext(browser_context_);
123 DCHECK(!event_data_);
124 event_data_.reset(new ZoomChangedEventData(web_contents(),
128 false /* can_show_bubble */));
129 int render_process_id = web_contents()->GetRenderProcessHost()->GetID();
130 int render_view_id = web_contents()->GetRenderViewHost()->GetRoutingID();
131 if (zoom_mode_ == ZOOM_MODE_ISOLATED ||
132 zoom_map->UsesTemporaryZoomLevel(render_process_id, render_view_id)) {
133 zoom_map->SetTemporaryZoomLevel(
134 render_process_id, render_view_id, zoom_level);
137 last_extension_ = NULL;
141 net::GetHostOrSpecFromURL(content::HostZoomMap::GetURLFromEntry(entry));
142 zoom_map->SetZoomLevelForHost(host, zoom_level);
145 DCHECK(!event_data_);
146 last_extension_ = NULL;
150 void ZoomController::SetZoomMode(ZoomMode new_mode) {
151 if (new_mode == zoom_mode_)
154 content::HostZoomMap* zoom_map =
155 content::HostZoomMap::GetDefaultForBrowserContext(browser_context_);
157 int render_process_id = web_contents()->GetRenderProcessHost()->GetID();
158 int render_view_id = web_contents()->GetRenderViewHost()->GetRoutingID();
159 double original_zoom_level = GetZoomLevel();
161 DCHECK(!event_data_);
162 event_data_.reset(new ZoomChangedEventData(web_contents(),
166 new_mode != ZOOM_MODE_DEFAULT));
169 case ZOOM_MODE_DEFAULT: {
170 content::NavigationEntry* entry =
171 web_contents()->GetController().GetLastCommittedEntry();
174 GURL url = content::HostZoomMap::GetURLFromEntry(entry);
175 std::string host = net::GetHostOrSpecFromURL(url);
177 if (zoom_map->HasZoomLevel(url.scheme(), host)) {
178 // If there are other tabs with the same origin, then set this tab's
179 // zoom level to match theirs. The temporary zoom level will be
180 // cleared below, but this call will make sure this tab re-draws at
181 // the correct zoom level.
182 double origin_zoom_level =
183 zoom_map->GetZoomLevelForHostAndScheme(url.scheme(), host);
184 event_data_->new_zoom_level = origin_zoom_level;
185 zoom_map->SetTemporaryZoomLevel(
186 render_process_id, render_view_id, origin_zoom_level);
188 // The host will need a level prior to removing the temporary level.
189 // We don't want the zoom level to change just because we entered
191 zoom_map->SetZoomLevelForHost(host, original_zoom_level);
194 // Remove per-tab zoom data for this tab. No event callback expected.
195 zoom_map->ClearTemporaryZoomLevel(render_process_id, render_view_id);
198 case ZOOM_MODE_ISOLATED: {
199 // Unless the zoom mode was |ZOOM_MODE_DISABLED| before this call, the
200 // page needs an initial isolated zoom back to the same level it was at
201 // in the other mode.
202 if (zoom_mode_ != ZOOM_MODE_DISABLED) {
203 zoom_map->SetTemporaryZoomLevel(
204 render_process_id, render_view_id, original_zoom_level);
206 // When we don't call any HostZoomMap set functions, we send the event
209 ZoomObserver, observers_, OnZoomChanged(*event_data_));
214 case ZOOM_MODE_MANUAL: {
215 // Unless the zoom mode was |ZOOM_MODE_DISABLED| before this call, the
216 // page needs to be resized to the default zoom. While in manual mode,
217 // the zoom level is handled independently.
218 if (zoom_mode_ != ZOOM_MODE_DISABLED) {
219 zoom_map->SetTemporaryZoomLevel(
220 render_process_id, render_view_id, GetDefaultZoomLevel());
221 zoom_level_ = original_zoom_level;
223 // When we don't call any HostZoomMap set functions, we send the event
226 ZoomObserver, observers_, OnZoomChanged(*event_data_));
231 case ZOOM_MODE_DISABLED: {
232 // The page needs to be zoomed back to default before disabling the zoom
233 zoom_map->SetTemporaryZoomLevel(
234 render_process_id, render_view_id, GetDefaultZoomLevel());
238 // Any event data we've stored should have been consumed by this point.
239 DCHECK(!event_data_);
241 zoom_mode_ = new_mode;
244 void ZoomController::DidNavigateMainFrame(
245 const content::LoadCommittedDetails& details,
246 const content::FrameNavigateParams& params) {
247 if (details.entry && details.entry->GetPageType() == content::PAGE_TYPE_ERROR)
248 content::HostZoomMap::SendErrorPageZoomLevelRefresh(web_contents());
250 // If the main frame's content has changed, the new page may have a different
251 // zoom level from the old one.
252 UpdateState(std::string());
255 void ZoomController::WebContentsDestroyed() {
256 // At this point we should no longer be sending any zoom events with this
261 void ZoomController::OnZoomLevelChanged(
262 const content::HostZoomMap::ZoomLevelChange& change) {
263 UpdateState(change.host);
266 void ZoomController::UpdateState(const std::string& host) {
267 // If |host| is empty, all observers should be updated.
269 // Use the navigation entry's URL instead of the WebContents' so virtual
270 // URLs work (e.g. chrome://settings). http://crbug.com/153950
271 content::NavigationEntry* entry =
272 web_contents()->GetController().GetLastCommittedEntry();
274 host != net::GetHostOrSpecFromURL(
275 content::HostZoomMap::GetURLFromEntry(entry))) {
280 // The zoom bubble should not be shown for zoom changes where the host is
282 bool can_show_bubble = can_show_bubble_ && !host.empty();
285 // For state changes initiated within the ZoomController, information about
286 // the change should be sent.
287 ZoomChangedEventData zoom_change_data = *event_data_;
289 zoom_change_data.can_show_bubble = can_show_bubble;
291 ZoomObserver, observers_, OnZoomChanged(zoom_change_data));
293 // TODO(wjmaclean) Should we consider having HostZoomMap send both old and
294 // new zoom levels here?
295 double zoom_level = GetZoomLevel();
296 ZoomChangedEventData zoom_change_data(
297 web_contents(), zoom_level, zoom_level, zoom_mode_, can_show_bubble);
299 ZoomObserver, observers_, OnZoomChanged(zoom_change_data));