Print Preview: Hook up the print button to initiate printing without displaying a print dialog.

chrome/renderer/print_web_view_helper.cc

 // 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.
 
 #include "chrome/renderer/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/process_util.h"
@@ skipping 121 matching lines @@
     IPC_MESSAGE_HANDLER(ViewMsg_PrintPages, OnPrintPages)
     IPC_MESSAGE_HANDLER(ViewMsg_PrintingDone, OnPrintingDone)
     IPC_MESSAGE_HANDLER(ViewMsg_PrintPreview, OnPrintPreview)
     IPC_MESSAGE_HANDLER(ViewMsg_PrintNodeUnderContextMenu,
                         OnPrintNodeUnderContextMenu)
     IPC_MESSAGE_UNHANDLED(handled = false)
     IPC_END_MESSAGE_MAP()
   return handled;
 }
 
-void PrintWebViewHelper::OnPrintForPrintPreview() {
+void PrintWebViewHelper::OnPrintForPrintPreview(
+    const DictionaryValue& job_settings) {
+#if defined(OS_MACOSX)
+  // If still not finished with earlier print request simply ignore.
+  if (print_web_view_)
+    return;
+
   if (!render_view()->webview())
     return;
   WebFrame* main_frame = render_view()->webview()->mainFrame();
   if (!main_frame)
     return;
 
   WebDocument document = main_frame->document();
   // <object> with id="pdf-viewer" is created in
   // chrome/browser/resources/print_preview.js
   WebElement element = document.getElementById("pdf-viewer");
   if (element.isNull()) {
     NOTREACHED();
     return;
   }
 
-  PrintNode(&element, false, false);
+  if (!InitPrintSettings(element.document().frame(), &element)) {
+    NOTREACHED() << "Failed to initialize print page settings";
+    return;
+  }
+
+  if (!UpdatePrintSettings(job_settings)) {
+    NOTREACHED() << "Failed to update print page settings";
+    DidFinishPrinting(true); // Release all printing resources.
+    return;
+  }
+
+  // Render Pages for printing.
+  RenderPagesForPrint(element.document().frame(), &element);
+#endif
 }
 
 void PrintWebViewHelper::OnPrint(bool is_preview) {
   DCHECK(render_view()->webview());
   if (!render_view()->webview())
     return;
 
   // If the user has selected text in the currently focused frame we print
   // only that frame (this makes print selection work for multiple frames).
   if (render_view()->webview()->focusedFrame()->hasSelection())
@@ skipping 323 matching lines @@
                                            WebNode* node) {
   ViewMsg_PrintPages_Params settings;
   if (GetDefaultPrintSettings(frame, node, &settings.params)) {
     print_pages_params_.reset(new ViewMsg_PrintPages_Params(settings));
     print_pages_params_->pages.clear();
     return true;
   }
   return false;
 }
 
-bool PrintWebViewHelper::GetDefaultPrintSettings(
-    WebFrame* frame,
-    WebNode* node,
-    ViewMsg_Print_Params* params) {
+bool PrintWebViewHelper::UpdatePrintSettings(
+    const DictionaryValue& job_settings) {
+  ViewMsg_PrintPages_Params settings;
+  if (!render_view()->Send(new ViewHostMsg_UpdatePrintSettings(
+          render_view()->routing_id(),
+          (*print_pages_params_).params.document_cookie,

[Lei Zhang, 2011/03/04 20:01:56]

nit: isn't this print_pages_params->params.document_cookie?

[kmadhusu, 2011/03/04 21:20:03]

Done.

+          job_settings, &settings.params))) {
+    NOTREACHED();
+    return false;
+  }
+  print_pages_params_.reset(new ViewMsg_PrintPages_Params(settings));
+  return true;
+}
+
+bool PrintWebViewHelper::GetDefaultPrintSettings(WebFrame* frame,
+                                                 WebNode* node,
+                                                 ViewMsg_Print_Params* params) {
   if (!render_view()->Send(new ViewHostMsg_GetDefaultPrintSettings(
           render_view()->routing_id(), params))) {
     NOTREACHED();
     return false;
   }
   // Check if the printer returned any settings, if the settings is empty, we
   // can safely assume there are no printer drivers configured. So we safely
   // terminate.
   if (params->IsEmpty()) {
     render_view()->runModalAlertDialog(
@@ skipping 75 matching lines @@
         shared_buf.GiveToProcess(base::GetCurrentProcessHandle(),
                                  shared_mem_handle);
         return true;
       }
     }
   }
   NOTREACHED();
   return false;
 }
 #endif  // defined(OS_POSIX)