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// Copyright (c) 2010 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/printing/print_preview_tab_controller.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/tabs/tab_strip_model.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_navigator.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/url_constants.h"
namespace printing {
// static
PrintPreviewTabController* PrintPreviewTabController::GetInstance() {
if (!g_browser_process)
return NULL;
return g_browser_process->print_preview_tab_controller();
}
PrintPreviewTabController::PrintPreviewTabController()
: waiting_for_new_preview_page_(false) {
}
PrintPreviewTabController::~PrintPreviewTabController() {
preview_tab_map_.clear();
}
TabContents* PrintPreviewTabController::GetOrCreatePreviewTab(
TabContents* initiator_tab, int browser_window_id ) {
DCHECK(initiator_tab);
if (IsPrintPreviewTab(initiator_tab))
return initiator_tab;
// Get the print preview tab for |initiator_tab|.
TabContents* preview_tab = GetPrintPreviewForTab(initiator_tab);
if (preview_tab) {
// Show current preview tab.
preview_tab->Activate();
return preview_tab;
}
return CreatePrintPreviewTab(initiator_tab, browser_window_id);
}
bool PrintPreviewTabController::IsPrintPreviewTab(TabContents* tab) {
const GURL& url = tab->GetURL();
return (url.SchemeIs(chrome::kChromeUIScheme) &&
url.host() == chrome::kChromeUIPrintHost);
}
TabContents* PrintPreviewTabController::GetInitiatorTab(
TabContents* preview_tab) {
PrintPreviewTabMap::iterator it = preview_tab_map_.find(preview_tab);
if (it != preview_tab_map_.end())
return preview_tab_map_[preview_tab];
return NULL;
}
TabContents* PrintPreviewTabController::GetPrintPreviewForTab(
TabContents* tab) {
PrintPreviewTabMap::iterator it = preview_tab_map_.find(tab);
if (it != preview_tab_map_.end())
return tab;
for (it = preview_tab_map_.begin(); it != preview_tab_map_.end(); ++it) {
if (it->second == tab)
return it->first;
}
return NULL;
}
void PrintPreviewTabController::AddObservers(TabContents* tab) {
registrar_.Add(this, NotificationType::TAB_CONTENTS_DESTROYED,
Source<TabContents>(tab));
registrar_.Add(this, NotificationType::NAV_ENTRY_COMMITTED,
Source<NavigationController>(&tab->controller()));
}
void PrintPreviewTabController::RemoveObservers(TabContents* tab) {
registrar_.Remove(this, NotificationType::TAB_CONTENTS_DESTROYED,
Source<TabContents>(tab));
registrar_.Remove(this, NotificationType::NAV_ENTRY_COMMITTED,
Source<NavigationController>(&tab->controller()));
}
TabContents* PrintPreviewTabController::CreatePrintPreviewTab(
TabContents* initiator_tab, int browser_window_id) {
Browser* current_browser = BrowserList::FindBrowserWithID(browser_window_id);
// Add a new tab next to initiator tab.
browser::NavigateParams params(current_browser,
GURL(chrome::kChromeUIPrintURL),
PageTransition::LINK);
params.disposition = NEW_FOREGROUND_TAB;
params.tabstrip_index = current_browser->tabstrip_model()->
GetIndexOfTabContents(initiator_tab) + 1;
browser::Navigate(¶ms);
TabContents* preview_tab = params.target_contents;
preview_tab->Activate();
// Add an entry to the map.
preview_tab_map_[preview_tab] = initiator_tab;
waiting_for_new_preview_page_ = true;
AddObservers(initiator_tab);
AddObservers(preview_tab);
return preview_tab;
}
void PrintPreviewTabController::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
TabContents* initiator_tab = NULL;
TabContents* preview_tab = NULL;
TabContents* source_tab = NULL;
NavigationController::LoadCommittedDetails* detail_info = NULL;
switch (type.value) {
case NotificationType::TAB_CONTENTS_DESTROYED: {
source_tab = Source<TabContents>(source).ptr();
break;
}
case NotificationType::NAV_ENTRY_COMMITTED: {
NavigationController* controller =
Source<NavigationController>(source).ptr();
source_tab = controller->tab_contents();
detail_info =
Details<NavigationController::LoadCommittedDetails>(details).ptr();
break;
}
default: {
NOTREACHED();
return;
}
}
DCHECK(source_tab);
preview_tab = GetPrintPreviewForTab(source_tab);
// |source_tab| is preview tab.
if (preview_tab == source_tab)
initiator_tab = GetInitiatorTab(source_tab);
else
initiator_tab = source_tab;
if (detail_info) {
PageTransition::Type transition_type =
detail_info->entry->transition_type();
NavigationType::Type nav_type = detail_info->type;
// Don't update/erase the map entry if the page has not changed.
if (transition_type == PageTransition::RELOAD ||
nav_type == NavigationType::SAME_PAGE) {
return;
}
// New |preview_tab| is created. Don't update/erase map entry.
if (waiting_for_new_preview_page_ &&
transition_type == PageTransition::LINK &&
nav_type == NavigationType::NEW_PAGE &&
source_tab == preview_tab) {
waiting_for_new_preview_page_ = false;
return;
}
// User navigated to a preview tab using forward/back button.
if (IsPrintPreviewTab(source_tab) &&
transition_type == PageTransition::FORWARD_BACK &&
nav_type == NavigationType::EXISTING_PAGE) {
return;
}
}
// If |source_tab| is |initiator_tab|, update the map entry.
if (source_tab == initiator_tab) {
preview_tab_map_[preview_tab] = NULL;
}
// If |source_tab| is |preview_tab|, erase the map entry.
if (source_tab == preview_tab) {
preview_tab_map_.erase(preview_tab);
RemoveObservers(preview_tab);
}
if (initiator_tab)
RemoveObservers(initiator_tab);
}
} // namespace printing
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