Implement window.print() on Android

chrome/renderer/printing/print_web_view_helper.cc

Index: chrome/renderer/printing/print_web_view_helper.cc
diff --git a/chrome/renderer/printing/print_web_view_helper.cc b/chrome/renderer/printing/print_web_view_helper.cc
index 494ab7ea024d962eb649c50843cba6b281fa2fb8..eeab5d9093b64373470128d0aa989cbe7acaebd4 100644
--- a/chrome/renderer/printing/print_web_view_helper.cc
+++ b/chrome/renderer/printing/print_web_view_helper.cc
@@ -794,9 +794,6 @@ void PrintWebViewHelper::DisablePreview() {
 
 bool PrintWebViewHelper::IsScriptInitiatedPrintAllowed(
     blink::WebFrame* frame, bool user_initiated) {
-#if defined(OS_ANDROID)
-  return false;

[dgn, 2014/11/20 12:26:16]

That's how window.print() was disabled

-#endif  // defined(OS_ANDROID)
   // If preview is enabled, then the print dialog is tab modal, and the user
   // can always close the tab on a mis-behaving page (the system print dialog
   // is app modal). If the print was initiated through user action, don't
@@ -821,6 +818,9 @@ void PrintWebViewHelper::DidStopLoading() {
 // Prints |frame| which called window.print().
 void PrintWebViewHelper::PrintPage(blink::WebLocalFrame* frame,
                                    bool user_initiated) {
+
+  DLOG(INFO) << "DGN PrintPage - From Script - routing_id: " << routing_id();
+
   DCHECK(frame);
 
   // Allow Prerendering to cancel this print request if necessary.
@@ -830,15 +830,33 @@ void PrintWebViewHelper::PrintPage(blink::WebLocalFrame* frame,
     return;
   }
 
-  if (!IsScriptInitiatedPrintAllowed(frame, user_initiated))
+  if (!IsScriptInitiatedPrintAllowed(frame, user_initiated)) {
+    DLOG(INFO) << "DGN PrintPage - Script printing not allowed";
     return;
+  }
 
+#if defined(OS_ANDROID)
+  int cookie = 0;
+  if (!print_pages_params_) {
+    DLOG(INFO) << "DGN PrintPage - no print_pages_params_";
+  } else {
+    cookie = print_pages_params_->params.document_cookie;

[dgn, 2014/11/20 12:26:16]

how to properly initialize params? I currently always have 0 for cookie

+    DLOG(INFO) << "DGN PrintPage - print_pages_params_->params.document_cookie is " << cookie;
+  }
+
+  DLOG(INFO) << "DGN PrintPage - Sending InitiateAndroidPrint";
+  IPC::SyncMessage* msg = new PrintHostMsg_InitiateAndroidPrint(routing_id(), cookie);
+  msg->EnableMessagePumping();
+  Send(msg);

[dgn, 2014/11/20 12:26:16]

This is the where the renderer should wait until printing is completely done.
Currently it returns once android's printingmanager's initialization is done,
right before the dialog is shown

+  DLOG(INFO) << "DGN PrintPage - InitiateAndroidPrint returned";
+#else
   if (!g_is_preview_enabled_) {
     Print(frame, blink::WebNode());

[Vitaly Buka (NO REVIEWS), 2014/11/21 17:05:13]

it should go into Print(frame, blink::WebNode());

   } else {
     print_preview_context_.InitWithFrame(frame);
     RequestPrintPreview(PRINT_PREVIEW_SCRIPTED);
   }
+#endif
 }
 
 bool PrintWebViewHelper::OnMessageReceived(const IPC::Message& message) {
@@ -946,6 +964,7 @@ bool PrintWebViewHelper::GetPrintFrame(blink::WebLocalFrame** frame) {
 
 #if defined(ENABLE_BASIC_PRINTING)
 void PrintWebViewHelper::OnPrintPages() {
+  DLOG(INFO) << "DGN - OnPrintPages - Call from PrintManager";
   blink::WebLocalFrame* frame;
   if (GetPrintFrame(&frame))
     Print(frame, blink::WebNode());
@@ -1244,8 +1263,12 @@ void PrintWebViewHelper::PrintNode(const blink::WebNode& node) {
 void PrintWebViewHelper::Print(blink::WebLocalFrame* frame,
                                const blink::WebNode& node) {
   // If still not finished with earlier print request simply ignore.
-  if (prep_frame_view_)
+  DLOG(INFO) << "DGN Print";
+
+  if (prep_frame_view_) {
+    DLOG(INFO) << "DGN Print request ignored";
     return;
+  }
 
   FrameReference frame_ref(frame);
 
@@ -1255,6 +1278,8 @@ void PrintWebViewHelper::Print(blink::WebLocalFrame* frame,
     return;  // Failed to init print page settings.
   }
 
+  DLOG(INFO) << "DGN CalculateNumberOfPages OK";
+
   // Some full screen plugins can say they don't want to print.
   if (!expected_page_count) {
     DidFinishPrinting(FAIL_PRINT);
@@ -1268,6 +1293,8 @@ void PrintWebViewHelper::Print(blink::WebLocalFrame* frame,
     return;
   }
 
+  DLOG(INFO) << "DGN GetPrintSettingsFromUser OK";
+
   // Render Pages for printing.
   if (!RenderPagesForPrint(frame_ref.GetFrame(), node)) {
     LOG(ERROR) << "RenderPagesForPrint failed";
@@ -1277,6 +1304,9 @@ void PrintWebViewHelper::Print(blink::WebLocalFrame* frame,
 }
 
 void PrintWebViewHelper::DidFinishPrinting(PrintingResult result) {
+  if (result == OK) DLOG(INFO) << "DGN DidFinishPrinting";
+  else DLOG(INFO) << "DGN DidFinishPrinting - Failure: " << result;
+
   switch (result) {
     case OK:
       break;
@@ -1567,6 +1597,7 @@ bool PrintWebViewHelper::RenderPagesForPrint(blink::WebLocalFrame* frame,
                                              const blink::WebNode& node) {
   if (!frame || prep_frame_view_)
     return false;
+
   const PrintMsg_PrintPages_Params& params = *print_pages_params_;
   const PrintMsg_Print_Params& print_params = params.params;
   prep_frame_view_.reset(new PrepareFrameAndViewForPrint(