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

chrome/renderer/print_web_view_helper.cc

Index: chrome/renderer/print_web_view_helper.cc
diff --git a/chrome/renderer/print_web_view_helper.cc b/chrome/renderer/print_web_view_helper.cc
index 4c059afc97c281cdbab259efe3b2b736ba9fe905..c82bdc2bf1f28d9b582e7dc71f3e86399cb3834e 100644
--- a/chrome/renderer/print_web_view_helper.cc
+++ b/chrome/renderer/print_web_view_helper.cc
@@ -116,8 +116,12 @@ void PrintWebViewHelper::PrintFrame(WebFrame* frame,
 
 void PrintWebViewHelper::PrintNode(WebNode* node,
                                    bool script_initiated,
-                                   bool is_preview) {
-  Print(node->document().frame(), node, script_initiated, is_preview);
+                                   bool is_preview,
+                                   bool is_print_for_print_preview) {
+  if (is_print_for_print_preview)
+    PrintForPrintPreview(node->document().frame(), node);
+  else
+    Print(node->document().frame(), node, script_initiated, is_preview);
 }
 
 bool PrintWebViewHelper::OnMessageReceived(const IPC::Message& message) {
@@ -135,7 +139,9 @@ bool PrintWebViewHelper::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
-void PrintWebViewHelper::OnPrintForPrintPreview() {
+void PrintWebViewHelper::OnPrintForPrintPreview(
+    const std::string& job_settings) {
+#if defined(OS_MACOSX)
   if (!render_view()->webview())
     return;
   WebFrame* main_frame = render_view()->webview()->mainFrame();
@@ -151,7 +157,11 @@ void PrintWebViewHelper::OnPrintForPrintPreview() {
     return;
   }
 
-  PrintNode(&element, false, false);
+  InitPrintSettings(element.document().frame(), &element,
+                    PrintWebViewHelper::DEFAULT);
+  UpdatePrintSettings(job_settings);
+  PrintNode(&element, false, false, true);

[Lei Zhang, 2011/02/18 05:21:42]

Why change PrintNode()? Why not just call PrintForPrintPreview() directly?

[kmadhusu, 2011/02/21 01:30:26]

Fixed.

+#endif
 }
 
 void PrintWebViewHelper::OnPrint(bool is_preview) {
@@ -190,7 +200,24 @@ void PrintWebViewHelper::OnPrintNodeUnderContextMenu() {
   // Make a copy of the node, since we will do a sync call to the browser and
   // during that time OnContextMenuClosed might reset context_menu_node_.
   WebNode context_menu_node(render_view()->context_menu_node());
-  PrintNode(&context_menu_node, false, false);
+  PrintNode(&context_menu_node, false, false, false);
+}
+
+void PrintWebViewHelper::PrintForPrintPreview(WebKit::WebFrame* frame,
+                                              WebNode* node) {
+  // If still not finished with earlier print request simply ignore.
+  if (print_web_view_)
+    return;
+
+  // Initialize print params with current print settings.
+  if (!InitPrintSettings(frame, node, PrintWebViewHelper::CURRENT)) {
+    NOTREACHED();
+    DidFinishPrinting(true); // Release all printing resources.
+    return;  // Failed to init print page settings.
+  }
+
+  // Render Pages for printing.
+  RenderPagesForPrint(frame, node);
 }
 
 void PrintWebViewHelper::Print(WebKit::WebFrame* frame,
@@ -229,7 +256,7 @@ void PrintWebViewHelper::Print(WebKit::WebFrame* frame,
   is_preview_ = is_preview;
 
   // Initialize print settings.
-  if (!InitPrintSettings(frame, node))
+  if (!InitPrintSettings(frame, node, PrintWebViewHelper::DEFAULT))
     return;  // Failed to init print page settings.
 
   int expected_pages_count = 0;
@@ -485,9 +512,10 @@ void PrintWebViewHelper::UpdatePrintableSizeInPrintParameters(
 }
 
 bool PrintWebViewHelper::InitPrintSettings(WebFrame* frame,
-                                           WebNode* node) {
+                                           WebNode* node,
+                                           GetSettingsParam setting_type) {
   ViewMsg_PrintPages_Params settings;
-  if (GetDefaultPrintSettings(frame, node, &settings.params)) {
+  if (GetPrintSettings(frame, node, setting_type, &settings.params)) {
     print_pages_params_.reset(new ViewMsg_PrintPages_Params(settings));
     print_pages_params_->pages.clear();
     return true;
@@ -495,12 +523,32 @@ bool PrintWebViewHelper::InitPrintSettings(WebFrame* frame,
   return false;
 }
 
-bool PrintWebViewHelper::GetDefaultPrintSettings(
-    WebFrame* frame,
-    WebNode* node,
-    ViewMsg_Print_Params* params) {
-  if (!render_view()->Send(new ViewHostMsg_GetDefaultPrintSettings(
-          render_view()->routing_id(), params))) {
+bool PrintWebViewHelper::UpdatePrintSettings(const std::string& job_settings) {
+  ViewMsg_PrintPages_Params settings;
+  IPC::SyncMessage* msg = new ViewHostMsg_UpdatePrintSettings(
+      render_view()->routing_id(),
+      (*print_pages_params_).params.document_cookie,
+      job_settings, &settings.params);
+  if (!render_view()->Send(msg)) {
+    NOTREACHED();
+    return false;
+  }
+  print_pages_params_.reset(new ViewMsg_PrintPages_Params(settings));
+  return true;
+}
+
+bool PrintWebViewHelper::GetPrintSettings(WebFrame* frame, WebNode* node,
+    GetSettingsParam setting_type, ViewMsg_Print_Params* params) {
+  IPC::SyncMessage* msg = NULL;
+  if (setting_type == CURRENT) {
+    msg = new ViewHostMsg_GetCurrentPrintSettings(render_view()->routing_id(),
+              (*print_pages_params_).params.document_cookie,
+              params);
+  } else {
+    msg = new ViewHostMsg_GetDefaultPrintSettings(render_view()->routing_id(),
+                                                  params);
+  }
+  if (!render_view()->Send(msg)) {
     NOTREACHED();
     return false;
   }