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      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.
      4 
      5 #ifndef CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
      6 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "content/public/browser/web_contents_observer.h"
     10 #include "content/public/browser/web_contents_user_data.h"
     11 
     12 class PrintPreviewUI;
     13 struct PrintHostMsg_DidGetPreviewPageCount_Params;
     14 struct PrintHostMsg_DidPreviewDocument_Params;
     15 struct PrintHostMsg_DidPreviewPage_Params;
     16 struct PrintHostMsg_RequestPrintPreview_Params;
     17 
     18 namespace content {
     19 class WebContents;
     20 }
     21 
     22 namespace gfx {
     23 class Rect;
     24 }
     25 
     26 namespace printing {
     27 
     28 struct PageSizeMargins;
     29 
     30 // Manages the print preview handling for a WebContents.
     31 class PrintPreviewMessageHandler
     32     : public content::WebContentsObserver,
     33       public content::WebContentsUserData<PrintPreviewMessageHandler> {
     34  public:
     35   virtual ~PrintPreviewMessageHandler();
     36 
     37   // content::WebContentsObserver implementation.
     38   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     39 
     40  private:
     41   explicit PrintPreviewMessageHandler(content::WebContents* web_contents);
     42   friend class content::WebContentsUserData<PrintPreviewMessageHandler>;
     43 
     44   // Gets the print preview dialog associated with the WebContents being
     45   // observed.
     46   content::WebContents* GetPrintPreviewDialog();
     47 
     48   // Gets the PrintPreviewUI associated with the WebContents being observed.
     49   PrintPreviewUI* GetPrintPreviewUI();
     50 
     51   // Message handlers.
     52   void OnRequestPrintPreview(
     53       const PrintHostMsg_RequestPrintPreview_Params& params);
     54   void OnDidGetDefaultPageLayout(
     55       const printing::PageSizeMargins& page_layout_in_points,
     56       const gfx::Rect& printable_area_in_points,
     57       bool has_custom_page_size_style);
     58   void OnDidGetPreviewPageCount(
     59       const PrintHostMsg_DidGetPreviewPageCount_Params& params);
     60   void OnDidPreviewPage(const PrintHostMsg_DidPreviewPage_Params& params);
     61   void OnMetafileReadyForPrinting(
     62       const PrintHostMsg_DidPreviewDocument_Params& params);
     63   void OnPrintPreviewFailed(int document_cookie);
     64   void OnPrintPreviewCancelled(int document_cookie);
     65   void OnInvalidPrinterSettings(int document_cookie);
     66   void OnPrintPreviewScalingDisabled();
     67 
     68   DISALLOW_COPY_AND_ASSIGN(PrintPreviewMessageHandler);
     69 };
     70 
     71 }  // namespace printing
     72 
     73 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
     74