Added Header and Footer support using Skia

chrome/renderer/print_web_view_helper.h

 // Copyright (c) 2011 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_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #define CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/time.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
 #include "content/renderer/render_view_observer.h"
 #include "content/renderer/render_view_observer_tracker.h"
 #include "printing/metafile.h"
+#include "skia/ext/vector_canvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/core/SkScalar.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
 
 struct PrintMsg_Print_Params;
 struct PrintMsg_PrintPage_Params;
 struct PrintMsg_PrintPages_Params;
 
 namespace base {
 class DictionaryValue;
@@ skipping 77 matching lines @@
 
   // Message handlers ---------------------------------------------------------
 
   // Print the document.
   void OnPrintPages();
 
   // Initiate print preview.
   void OnInitiatePrintPreview();
 
   // Generate a print preview using |settings|.
-  void OnPrintPreview(const base::DictionaryValue& settings);
+  // |header_footer_info| contains the necessary strings generated by the
+  // browser process to be printed as headers and footers if requested by the
+  // user.
+  void OnPrintPreview(const base::DictionaryValue& settings,
+                      const DictionaryValue& header_footer_info);
 
   // Print / preview the node under the context menu.
   void OnPrintNodeUnderContextMenu();
 
   // Print the pages for print preview. Do not display the native print dialog
   // for user settings. |job_settings| has new print job settings values.
   void OnPrintForPrintPreview(const base::DictionaryValue& job_settings);
 
   void OnPrintingDone(bool success);
 
@@ skipping 47 matching lines @@
   // It will implicitly revert the document to display CSS media type.
   bool PrintPages(const PrintMsg_PrintPages_Params& params,
                   WebKit::WebFrame* frame,
                   WebKit::WebNode* node);
 
   // Prints the page listed in |params|.
 #if defined(USE_X11)
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame,
-                         printing::Metafile* metafile);
+                         printing::Metafile* metafile,
+                         bool is_preview,
+                         int total_pages);
 #else
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame);
 #endif
 
   // Render the frame for printing.
   bool RenderPagesForPrint(WebKit::WebFrame* frame, WebKit::WebNode* node);
 
   // Render the frame for preview.
@@ skipping 27 matching lines @@
   // Helper methods -----------------------------------------------------------
 
   bool CopyAndPrint(WebKit::WebFrame* web_frame);
 
   bool CopyMetafileDataToSharedMem(printing::Metafile* metafile,
                                    base::SharedMemoryHandle* shared_mem_handle);
 
   void GetPageSizeAndMarginsInPoints(
       WebKit::WebFrame* frame,
       int page_index,
-      const PrintMsg_Print_Params& default_params,
-      double* content_width_in_points,
-      double* content_height_in_points,
-      double* margin_top_in_points,
-      double* margin_right_in_points,
-      double* margin_bottom_in_points,
-      double* margin_left_in_points);
+      const PrintMsg_Print_Params& default_params);
 
   bool IsModifiable(WebKit::WebFrame* frame, WebKit::WebNode* node);
 
   void UpdatePrintableSizeInPrintParameters(WebKit::WebFrame* frame,
                                             WebKit::WebNode* node,
                                             PrintMsg_Print_Params* params);
 
   bool GetPrintFrame(WebKit::WebFrame** frame);
 
   // This reports the current time - |start_time| as the time to render
@@ skipping 43 matching lines @@
   base::Time last_cancelled_script_print_;
   int user_cancelled_scripted_print_count_;
 
   // Let the browser process know of a printing failure. Only set to false when
   // the failure came from the browser in the first place.
   bool notify_browser_of_print_failure_;
 
   int preview_page_count_;
   scoped_ptr<PrintMsg_PrintPages_Params> old_print_pages_params_;
 
+  // Contains strings generated by the browser process to be printed as headers
+  // and footers if requested by the user.
+  const DictionaryValue* header_footer_info_;
+
+  // Specifies the horizontal alignment of the Headers and Footers.
+  enum HorizontalHeaderFooterPosition {
+    LEFT,
+    CENTER,
+    RIGHT
+  };
+
+  // Specifies the vertical alignment of the Headers and Footers.
+  enum VerticalHeaderFooterPosition {
+    TOP,
+    BOTTOM
+  };
+
+  // Gets the x-coordinate from where we want to start printing the current text
+  // depending on the alignment (LEFT, RIGHT, CENTER).
+  SkScalar GetHorizontalCoordinate(
+    string16 text,
+    SkPaint paint,
+    HorizontalHeaderFooterPosition pos);
+
+  // Gets the y-coordinate from where we want to start printing based on if we
+  // are printing the Header or the Footer (TOP or BOTTOM).
+  SkScalar GetVerticalCoordinate(
+    SkPaint paint,
+    VerticalHeaderFooterPosition pos);
+
+  // Interstice or gap between different Header and Footer components.
+  // Hardcoded to 0.25cm = 1/10" = 7.2 points
+  const SkScalar header_footer_interstice;
+
+  // Given a text, the positions and the paint object, this method calculates
+  // the coordinates and prints the text at those co-ordinates.
+  void PrintHeaderFooterText(
+      string16 text,
+      SkPaint paint,
+      const SkRefPtr<skia::VectorCanvas>& canvas,
+      HorizontalHeaderFooterPosition hor_pos,
+      VerticalHeaderFooterPosition ver_pos,
+      float webkit_scale_factor);
+
+  // Given the device and canvas to draw on, prints the appropriate headers
+  // and footers on to the canvas.
+  void PrintHeaderAndFooter(SkDevice *device,
+                            const SkRefPtr<skia::VectorCanvas>& canvas,
+                            int page_number, int total_pages,
+                            float webkit_scale_factor);
+
+  double content_width_in_points;
+  double content_height_in_points;
+  double margin_top_in_points;
+  double margin_right_in_points;
+  double margin_bottom_in_points;
+  double margin_left_in_points;
+
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 #endif  // CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_