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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
      6 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
      7 
      8 #include "base/callback.h"
      9 #include "ui/shell_dialogs/select_file_dialog.h"
     10 
     11 namespace base {
     12 class FilePath;
     13 }
     14 
     15 namespace content {
     16 class DownloadItem;
     17 class DownloadManager;
     18 class WebContents;
     19 }
     20 
     21 // Handles showing a dialog to the user to ask for the filename for a download.
     22 class DownloadFilePicker : public ui::SelectFileDialog::Listener {
     23  public:
     24   // Callback used to pass the user selection back to the owner of this
     25   // object.
     26   // |virtual_path|: The path chosen by the user. If the user cancels the file
     27   //    selection, then this parameter will be the empty path. On Chrome OS,
     28   //    this path may contain virtual mount points if the user chose a virtual
     29   //    path (e.g. Google Drive).
     30   typedef base::Callback<void(const base::FilePath& virtual_path)>
     31       FileSelectedCallback;
     32 
     33   // Display a file picker dialog for |item|. The |suggested_path| will be used
     34   // as the initial path displayed to the user. |callback| will always be
     35   // invoked even if |item| is destroyed prior to the file picker completing.
     36   static void ShowFilePicker(content::DownloadItem* item,
     37                              const base::FilePath& suggested_path,
     38                              const FileSelectedCallback& callback);
     39 
     40  private:
     41   DownloadFilePicker(content::DownloadItem* item,
     42                      const base::FilePath& suggested_path,
     43                      const FileSelectedCallback& callback);
     44   virtual ~DownloadFilePicker();
     45 
     46   // Runs |file_selected_callback_| with |virtual_path| and then deletes this
     47   // object.
     48   void OnFileSelected(const base::FilePath& virtual_path);
     49 
     50   // SelectFileDialog::Listener implementation.
     51   virtual void FileSelected(const base::FilePath& path,
     52                             int index,
     53                             void* params) OVERRIDE;
     54   virtual void FileSelectionCanceled(void* params) OVERRIDE;
     55 
     56   // Initially suggested path.
     57   base::FilePath suggested_path_;
     58 
     59   // Callback invoked when a file selection is complete.
     60   FileSelectedCallback file_selected_callback_;
     61 
     62   // For managing select file dialogs.
     63   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
     64 
     65   // True if UMA regarding on the result of the file selection should be
     66   // recorded.
     67   bool should_record_file_picker_result_;
     68 
     69   DISALLOW_COPY_AND_ASSIGN(DownloadFilePicker);
     70 };
     71 
     72 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
     73