Prepopulating "Print To PDF" select file dialog with a suggested filename and path.

chrome/browser/ui/webui/print_preview_handler.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/browser/ui/webui/print_preview_handler.h"
 
 #include <string>
 
+#include "base/i18n/file_util_icu.h"
 #include "base/json/json_reader.h"
+#include "base/path_service.h"
 #include "base/threading/thread.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/print_preview_ui_html_source.h"
 #include "chrome/browser/ui/webui/print_preview_ui.h"
+#include "chrome/common/chrome_paths.h"
 #include "chrome/common/print_messages.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
+#include "grit/generated_resources.h"
 #include "printing/backend/print_backend.h"
 #include "printing/metafile.h"
 #include "printing/metafile_impl.h"
 #include "printing/print_job_constants.h"
+#include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
 const bool kColorDefaultValue = false;
 const bool kLandscapeDefaultValue = false;
 
 TabContents* GetInitiatorTab(TabContents* preview_tab) {
   printing::PrintPreviewTabController* tab_controller =
       printing::PrintPreviewTabController::GetInstance();
   if (!tab_controller)
@@ skipping 99 matching lines @@
   }
 
  private:
   // The metafile holding the PDF data.
   scoped_ptr<printing::Metafile> metafile_;
 
   // The absolute path where the file will be saved.
   FilePath path_;
 };
 
+FilePath* PrintPreviewHandler::last_saved_path_ = NULL;
+
 PrintPreviewHandler::PrintPreviewHandler()
     : print_backend_(printing::PrintBackend::CreateInstance(NULL)),
       need_to_generate_preview_(true),
       color_(kColorDefaultValue),
       landscape_(kLandscapeDefaultValue) {
+  if (!last_saved_path_) {
+    last_saved_path_ = new FilePath();

[Lei Zhang, 2011/04/14 21:00:37]

I think you're going to leak the new FilePath if you do it this way.
|last_saved_path_| probably should be a FilePath and not a FilePath*.

[dpapad, 2011/04/14 21:25:32]

I did this because that is what the style guide suggests for static variables.

More specifically it states:
"If you need a static or global variable of a class type, consider initializing
a pointer (which will never be freed)..."
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Static_and_Glo...

[Lei Zhang, 2011/04/14 21:29:56]

Oh right. Have you considered using a LazyInstance instead?

+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    PathService::Get(chrome::DIR_USER_DOCUMENTS, last_saved_path_);

[Lei Zhang, 2011/04/14 21:00:37]

You can do this in later in SelectFile().

[dpapad, 2011/04/14 21:25:32]

Done.

+  }
 }
 
 PrintPreviewHandler::~PrintPreviewHandler() {
   if (select_file_dialog_.get())
     select_file_dialog_->ListenerDestroyed();
 }
 
 void PrintPreviewHandler::RegisterMessages() {
   web_ui_->RegisterMessageCallback("getPrinters",
       NewCallback(this, &PrintPreviewHandler::HandleGetPrinters));
@@ skipping 37 matching lines @@
   TabContents* initiator_tab = GetInitiatorTab(web_ui_->tab_contents());
   if (initiator_tab) {
     RenderViewHost* rvh = initiator_tab->render_view_host();
     rvh->Send(new PrintMsg_ResetScriptedPrintCount(rvh->routing_id()));
   }
 
   scoped_ptr<DictionaryValue> settings(GetSettingsDictionary(args));
   if (!settings.get())
     return;
 
-  bool print_to_pdf;
+  bool print_to_pdf = false;
   settings->GetBoolean(printing::kSettingPrintToPDF, &print_to_pdf);
 
   if (print_to_pdf) {
-    SelectFile();
+    // Pre-populating select file dialog with print job title.
+    TabContentsWrapper* wrapper =
+        TabContentsWrapper::GetCurrentWrapperForContents(
+            web_ui_->tab_contents());
+
+    string16 print_job_title_temp = wrapper->print_view_manager()
+        ->RenderSourceName();

[Lei Zhang, 2011/04/14 21:00:37]

nit: this looks kind of weird style-wise.

[dpapad, 2011/04/14 21:25:32]

Done.

+
+    if (print_job_title_temp.length() == 0)

[Lei Zhang, 2011/04/14 21:00:37]

You don't need this. PrintViewManager::RenderSourceName() should have done that
for you.

[dpapad, 2011/04/14 21:25:32]

Done.

+      print_job_title_temp = l10n_util::GetStringUTF16(
+          IDS_DEFAULT_PRINT_DOCUMENT_TITLE);
+#if defined(OS_WIN)
+    FilePath::StringType print_job_title(print_job_title_temp);
+#else

[dpapad, 2011/04/14 02:33:35]

Should this be #elif defined(OS_POSIX)?

[Lei Zhang, 2011/04/14 21:00:37]

Sure.

[dpapad, 2011/04/14 21:25:32]

Done.

+    FilePath::StringType print_job_title = UTF16ToUTF8(print_job_title_temp);
+#endif
+
+    file_util::ReplaceIllegalCharactersInPath(&print_job_title, '_');
+    FilePath default_filename(print_job_title);
+    default_filename =
+        default_filename.ReplaceExtension(FILE_PATH_LITERAL("pdf"));
+
+    SelectFile(default_filename);
   } else {
     RenderViewHost* rvh = web_ui_->GetRenderViewHost();
     rvh->Send(new PrintMsg_PrintForPrintPreview(rvh->routing_id(), *settings));
   }
 }
 
 void PrintPreviewHandler::SendPrinterList(
     const ListValue& printers,
     const FundamentalValue& default_printer_index) {
   web_ui_->CallJavascriptFunction("setPrinters", printers,
@@ skipping 13 matching lines @@
 void PrintPreviewHandler::ProcessLandscapeSetting(
     const DictionaryValue& settings) {
   bool landscape = kLandscapeDefaultValue;
   settings.GetBoolean(printing::kSettingLandscape, &landscape);
   if (landscape != landscape_) {
     landscape_ = landscape;
     need_to_generate_preview_ = true;
   }
 }
 
-void PrintPreviewHandler::SelectFile() {
+void PrintPreviewHandler::SelectFile(const FilePath& default_filename) {
   SelectFileDialog::FileTypeInfo file_type_info;
   file_type_info.extensions.resize(1);
   file_type_info.extensions[0].push_back(FILE_PATH_LITERAL("pdf"));
 
   if (!select_file_dialog_.get())
     select_file_dialog_ = SelectFileDialog::Create(this);
 
   select_file_dialog_->SelectFile(
       SelectFileDialog::SELECT_SAVEAS_FILE,
       string16(),
-      FilePath(),
+      last_saved_path_->Append(default_filename),
       &file_type_info,
       0,
       FILE_PATH_LITERAL(""),
       platform_util::GetTopLevel(
           web_ui_->tab_contents()->GetNativeView()),
       NULL);
 }
 
 void PrintPreviewHandler::FileSelected(const FilePath& path,
                                        int index, void* params) {
   PrintPreviewUIHTMLSource::PrintPreviewData data;
   PrintPreviewUI* pp_ui = reinterpret_cast<PrintPreviewUI*>(web_ui_);
   pp_ui->html_source()->GetPrintPreviewData(&data);
   DCHECK(data.first != NULL);
   DCHECK(data.second > 0);
 
   printing::PreviewMetafile* metafile = new printing::PreviewMetafile;
   metafile->InitFromData(data.first->memory(), data.second);
 
+  // Updating last_saved_path_ to the newly selected folder.
+  *last_saved_path_ = path.DirName();
+
   PrintToPdfTask* task = new PrintToPdfTask(metafile, path);
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, task);
 }