PrintPreview: Hide/Show the header footer option based on print frame margins.

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 
 #include <map>
 
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/synchronization/lock.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/printing/print_preview_data_service.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/html_dialog_ui.h"
 #include "chrome/browser/ui/webui/print_preview/print_preview_data_source.h"
 #include "chrome/browser/ui/webui/print_preview/print_preview_handler.h"
 #include "chrome/common/print_messages.h"
 #include "content/public/browser/web_contents.h"
 #include "printing/page_size_margins.h"
 #include "printing/print_job_constants.h"
+#include "ui/gfx/rect.h"
 
 using content::WebContents;
 using printing::PageSizeMargins;
 
 namespace {
 
 // Thread-safe wrapper around a std::map to keep track of mappings from
 // PrintPreviewUI addresses to most recent print preview request ids.
 class PrintPreviewRequestIdMapWithLock {
  public:
@@ skipping 162 matching lines @@
     const PrintHostMsg_DidGetPreviewPageCount_Params& params) {
   DCHECK_GT(params.page_count, 0);
   base::FundamentalValue count(params.page_count);
   base::FundamentalValue request_id(params.preview_request_id);
   web_ui()->CallJavascriptFunction("onDidGetPreviewPageCount",
                                    count,
                                    request_id);
 }
 
 void PrintPreviewUI::OnDidGetDefaultPageLayout(
-    const PageSizeMargins& page_layout, bool has_custom_page_size_style) {
+    const PageSizeMargins& page_layout, const gfx::Rect& printable_area,
+    bool has_custom_page_size_style) {
   if (page_layout.margin_top < 0 || page_layout.margin_left < 0 ||
       page_layout.margin_bottom < 0 || page_layout.margin_right < 0 ||
-      page_layout.content_width < 0 || page_layout.content_height < 0) {
+      page_layout.content_width < 0 || page_layout.content_height < 0 ||
+      printable_area.width() <= 0 || printable_area.height() <= 0) {
     NOTREACHED();
     return;
   }
 
   base::DictionaryValue layout;
   layout.SetDouble(printing::kSettingMarginTop, page_layout.margin_top);
   layout.SetDouble(printing::kSettingMarginLeft, page_layout.margin_left);
   layout.SetDouble(printing::kSettingMarginBottom, page_layout.margin_bottom);
   layout.SetDouble(printing::kSettingMarginRight, page_layout.margin_right);
   layout.SetDouble(printing::kSettingContentWidth, page_layout.content_width);
   layout.SetDouble(printing::kSettingContentHeight, page_layout.content_height);
 
+  base::DictionaryValue printable_area_info;

[vandebo (ex-Chrome), 2012/03/19 17:11:30]

Seems like you could put this in the layout dictionary.  Is there any advantage
to putting it in a separate dictionary?

[kmadhusu, 2012/03/19 18:45:31]

Added printable area details in page layout dictionary.

+  printable_area_info.SetInteger(printing::kSettingPrintableAreaX,
+                                 printable_area.x());
+  printable_area_info.SetInteger(printing::kSettingPrintableAreaY,
+                                 printable_area.y());
+  printable_area_info.SetInteger(printing::kSettingPrintableAreaWidth,
+                                 printable_area.width());
+  printable_area_info.SetInteger(printing::kSettingPrintableAreaHeight,
+                                 printable_area.height());
+
   base::FundamentalValue has_page_size_style(has_custom_page_size_style);
   web_ui()->CallJavascriptFunction("onDidGetDefaultPageLayout", layout,
+                                   printable_area_info,
                                    has_page_size_style);
 }
 
 void PrintPreviewUI::OnDidPreviewPage(int page_number,
                                       int preview_request_id) {
   DCHECK_GE(page_number, 0);
   base::FundamentalValue number(page_number);
   StringValue ui_identifier(preview_ui_addr_str_);
   base::FundamentalValue request_id(preview_request_id);
   web_ui()->CallJavascriptFunction(
@@ skipping 74 matching lines @@
   ConstrainedHtmlUIDelegate* delegate = GetConstrainedDelegate();
   if (!delegate)
     return;
   delegate->GetHtmlDialogUIDelegate()->OnDialogClosed("");
   delegate->OnDialogCloseFromWebUI();
 }
 
 void PrintPreviewUI::OnReloadPrintersList() {
   web_ui()->CallJavascriptFunction("reloadPrintersList");
 }