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// 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.
#ifndef CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
#define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
#include <map>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "components/sessions/session_id.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class GURL;
namespace content {
struct LoadCommittedDetails;
class RenderProcessHost;
class WebContents;
}
namespace printing {
// For print preview, the WebContents that initiates the printing operation is
// the initiator, and the constrained dialog that shows the print preview is the
// print preview dialog.
// This class manages print preview dialog creation and destruction, and keeps
// track of the 1:1 relationship between initiator tabs and print preview
// dialogs.
class PrintPreviewDialogController
: public base::RefCounted<PrintPreviewDialogController>,
public content::NotificationObserver {
public:
PrintPreviewDialogController();
static PrintPreviewDialogController* GetInstance();
// Initiate print preview for |initiator|.
// Call this instead of GetOrCreatePreviewDialog().
static void PrintPreview(content::WebContents* initiator);
// Get/Create the print preview dialog for |initiator|.
// Exposed for unit tests.
content::WebContents* GetOrCreatePreviewDialog(
content::WebContents* initiator);
// Returns the preview dialog for |contents|.
// Returns |contents| if |contents| is a preview dialog.
// Returns NULL if no preview dialog exists for |contents|.
content::WebContents* GetPrintPreviewForContents(
content::WebContents* contents) const;
// Returns the initiator for |preview_dialog|.
// Returns NULL if no initiator exists for |preview_dialog|.
content::WebContents* GetInitiator(content::WebContents* preview_dialog);
// Run |callback| on the dialog of each active print preview operation.
void ForEachPreviewDialog(
base::Callback<void(content::WebContents*)> callback);
// content::NotificationObserver implementation.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// Returns true if |contents| is a print preview dialog.
static bool IsPrintPreviewDialog(content::WebContents* contents);
// Returns true if |url| is a print preview url.
static bool IsPrintPreviewURL(const GURL& url);
// Erase the initiator info associated with |preview_dialog|.
void EraseInitiatorInfo(content::WebContents* preview_dialog);
bool is_creating_print_preview_dialog() const {
return is_creating_print_preview_dialog_;
}
private:
friend class base::RefCounted<PrintPreviewDialogController>;
// 1:1 relationship between a print preview dialog and its initiator tab.
// Key: Print preview dialog.
// Value: Initiator.
typedef std::map<content::WebContents*, content::WebContents*>
PrintPreviewDialogMap;
~PrintPreviewDialogController() override;
// Handler for the RENDERER_PROCESS_CLOSED notification. This is observed when
// the initiator renderer crashed.
void OnRendererProcessClosed(content::RenderProcessHost* rph);
// Handler for the WEB_CONTENTS_DESTROYED notification. This is observed when
// either WebContents is closed.
void OnWebContentsDestroyed(content::WebContents* contents);
// Handler for the NAV_ENTRY_COMMITTED notification. This is observed when the
// renderer is navigated to a different page.
void OnNavEntryCommitted(content::WebContents* contents,
content::LoadCommittedDetails* details);
// Creates a new print preview dialog.
content::WebContents* CreatePrintPreviewDialog(
content::WebContents* initiator);
// Helper function to store the title of the initiator associated with
// |preview_dialog| in |preview_dialog|'s PrintPreviewUI.
void SaveInitiatorTitle(content::WebContents* preview_dialog);
// Adds/Removes observers for notifications from |contents|.
void AddObservers(content::WebContents* contents);
void RemoveObservers(content::WebContents* contents);
// Removes WebContents when they close/crash/navigate.
void RemoveInitiator(content::WebContents* initiator);
void RemovePreviewDialog(content::WebContents* preview_dialog);
// Mapping between print preview dialog and the corresponding initiator.
PrintPreviewDialogMap preview_dialog_map_;
// A registrar for listening to notifications.
content::NotificationRegistrar registrar_;
// True if the controller is waiting for a new preview dialog via
// content::NAVIGATION_TYPE_NEW_PAGE.
bool waiting_for_new_preview_page_;
// Whether the PrintPreviewDialogController is in the middle of creating a
// print preview dialog.
bool is_creating_print_preview_dialog_;
DISALLOW_COPY_AND_ASSIGN(PrintPreviewDialogController);
};
} // namespace printing
#endif // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
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