chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

   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 #include <gtk/gtk.h>
   6 #include <map>
   7 #include <set>
   8 #include <vector>
   9
  10 // Xlib defines RootWindow
  11 #undef RootWindow
  12
  13 #include "base/logging.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/message_loop/message_loop.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/sys_string_conversions.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/threading/thread.h"
  20 #include "base/threading/thread_restrictions.h"
  21 #include "chrome/browser/ui/libgtk2ui/gtk2_signal.h"
  22 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
  23 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
  24 #include "ui/aura/window_observer.h"
  25 #include "ui/base/l10n/l10n_util.h"
  26 #include "ui/shell_dialogs/select_file_dialog.h"
  27 #include "ui/strings/grit/ui_strings.h"
  28 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
  29
  30 namespace {
  31
  32 // Makes sure that .jpg also shows .JPG.
  33 gboolean FileFilterCaseInsensitive(const GtkFileFilterInfo* file_info,
  34                                    std::string* file_extension) {
  35   return EndsWith(file_info->filename, *file_extension, false);
  36 }
  37
  38 // Deletes |data| when gtk_file_filter_add_custom() is done with it.
  39 void OnFileFilterDataDestroyed(std::string* file_extension) {
  40   delete file_extension;
  41 }
  42
  43 }  // namespace
  44
  45 namespace libgtk2ui {
  46
  47 // Implementation of SelectFileDialog that shows a Gtk common dialog for
  48 // choosing a file or folder. This acts as a modal dialog.
  49 class SelectFileDialogImplGTK : public SelectFileDialogImpl,
  50                                 public aura::WindowObserver {
  51  public:
  52   explicit SelectFileDialogImplGTK(Listener* listener,
  53                                    ui::SelectFilePolicy* policy);
  54
  55  protected:
  56   virtual ~SelectFileDialogImplGTK();
  57
  58   // BaseShellDialog implementation:
  59   virtual bool IsRunning(gfx::NativeWindow parent_window) const override;
  60
  61   // SelectFileDialog implementation.
  62   // |params| is user data we pass back via the Listener interface.
  63   virtual void SelectFileImpl(
  64       Type type,
  65       const base::string16& title,
  66       const base::FilePath& default_path,
  67       const FileTypeInfo* file_types,
  68       int file_type_index,
  69       const base::FilePath::StringType& default_extension,
  70       gfx::NativeWindow owning_window,
  71       void* params) override;
  72
  73  private:
  74   virtual bool HasMultipleFileTypeChoicesImpl() override;
  75
  76   // Overridden from aura::WindowObserver:
  77   virtual void OnWindowDestroying(aura::Window* window) override;
  78
  79   // Add the filters from |file_types_| to |chooser|.
  80   void AddFilters(GtkFileChooser* chooser);
  81
  82   // Notifies the listener that a single file was chosen.
  83   void FileSelected(GtkWidget* dialog, const base::FilePath& path);
  84
  85   // Notifies the listener that multiple files were chosen.
  86   void MultiFilesSelected(GtkWidget* dialog,
  87                           const std::vector<base::FilePath>& files);
  88
  89   // Notifies the listener that no file was chosen (the action was canceled).
  90   // Dialog is passed so we can find that |params| pointer that was passed to
  91   // us when we were told to show the dialog.
  92   void FileNotSelected(GtkWidget* dialog);
  93
  94   GtkWidget* CreateSelectFolderDialog(
  95       Type type,
  96       const std::string& title,
  97       const base::FilePath& default_path,
  98       gfx::NativeWindow parent);
  99
 100   GtkWidget* CreateFileOpenDialog(const std::string& title,
 101       const base::FilePath& default_path, gfx::NativeWindow parent);
 102
 103   GtkWidget* CreateMultiFileOpenDialog(const std::string& title,
 104       const base::FilePath& default_path, gfx::NativeWindow parent);
 105
 106   GtkWidget* CreateSaveAsDialog(const std::string& title,
 107       const base::FilePath& default_path, gfx::NativeWindow parent);
 108
 109   // Removes and returns the |params| associated with |dialog| from
 110   // |params_map_|.
 111   void* PopParamsForDialog(GtkWidget* dialog);
 112
 113   // Take care of internal data structures when a file dialog is destroyed.
 114   void FileDialogDestroyed(GtkWidget* dialog);
 115
 116   // Check whether response_id corresponds to the user cancelling/closing the
 117   // dialog. Used as a helper for the below callbacks.
 118   bool IsCancelResponse(gint response_id);
 119
 120   // Common function for OnSelectSingleFileDialogResponse and
 121   // OnSelectSingleFolderDialogResponse.
 122   void SelectSingleFileHelper(GtkWidget* dialog,
 123                               gint response_id,
 124                               bool allow_folder);
 125
 126   // Common function for CreateFileOpenDialog and CreateMultiFileOpenDialog.
 127   GtkWidget* CreateFileOpenHelper(const std::string& title,
 128                                   const base::FilePath& default_path,
 129                                   gfx::NativeWindow parent);
 130
 131   // Callback for when the user responds to a Save As or Open File dialog.
 132   CHROMEGTK_CALLBACK_1(SelectFileDialogImplGTK, void,
 133                        OnSelectSingleFileDialogResponse, int);
 134
 135   // Callback for when the user responds to a Select Folder dialog.
 136   CHROMEGTK_CALLBACK_1(SelectFileDialogImplGTK, void,
 137                        OnSelectSingleFolderDialogResponse, int);
 138
 139   // Callback for when the user responds to a Open Multiple Files dialog.
 140   CHROMEGTK_CALLBACK_1(SelectFileDialogImplGTK, void,
 141                        OnSelectMultiFileDialogResponse, int);
 142
 143   // Callback for when the file chooser gets destroyed.
 144   CHROMEGTK_CALLBACK_0(SelectFileDialogImplGTK, void, OnFileChooserDestroy);
 145
 146   // Callback for when we update the preview for the selection.
 147   CHROMEGTK_CALLBACK_0(SelectFileDialogImplGTK, void, OnUpdatePreview);
 148
 149   // A map from dialog windows to the |params| user data associated with them.
 150   std::map<GtkWidget*, void*> params_map_;
 151
 152   // The GtkImage widget for showing previews of selected images.
 153   GtkWidget* preview_;
 154
 155   // All our dialogs.
 156   std::set<GtkWidget*> dialogs_;
 157
 158   // The set of all parent windows for which we are currently running dialogs.
 159   std::set<aura::Window*> parents_;
 160
 161   DISALLOW_COPY_AND_ASSIGN(SelectFileDialogImplGTK);
 162 };
 163
 164 // The size of the preview we display for selected image files. We set height
 165 // larger than width because generally there is more free space vertically
 166 // than horiztonally (setting the preview image will alway expand the width of
 167 // the dialog, but usually not the height). The image's aspect ratio will always
 168 // be preserved.
 169 static const int kPreviewWidth = 256;
 170 static const int kPreviewHeight = 512;
 171
 172 SelectFileDialogImpl* SelectFileDialogImpl::NewSelectFileDialogImplGTK(
 173     Listener* listener, ui::SelectFilePolicy* policy) {
 174   return new SelectFileDialogImplGTK(listener, policy);
 175 }
 176
 177 SelectFileDialogImplGTK::SelectFileDialogImplGTK(Listener* listener,
 178                                                  ui::SelectFilePolicy* policy)
 179     : SelectFileDialogImpl(listener, policy),
 180       preview_(NULL) {
 181 }
 182
 183 SelectFileDialogImplGTK::~SelectFileDialogImplGTK() {
 184   for (std::set<aura::Window*>::iterator iter = parents_.begin();
 185        iter != parents_.end(); ++iter) {
 186     (*iter)->RemoveObserver(this);
 187   }
 188   while (dialogs_.begin() != dialogs_.end()) {
 189     gtk_widget_destroy(*(dialogs_.begin()));
 190   }
 191 }
 192
 193 bool SelectFileDialogImplGTK::IsRunning(gfx::NativeWindow parent_window) const {
 194   return parents_.find(parent_window) != parents_.end();
 195 }
 196
 197 bool SelectFileDialogImplGTK::HasMultipleFileTypeChoicesImpl() {
 198   return file_types_.extensions.size() > 1;
 199 }
 200
 201 void SelectFileDialogImplGTK::OnWindowDestroying(aura::Window* window) {
 202   // Remove the |parent| property associated with the |dialog|.
 203   for (std::set<GtkWidget*>::iterator it = dialogs_.begin();
 204        it != dialogs_.end(); ++it) {
 205     aura::Window* parent = GetAuraTransientParent(*it);
 206     if (parent == window)
 207       ClearAuraTransientParent(*it);
 208   }
 209
 210   std::set<aura::Window*>::iterator iter = parents_.find(window);
 211   if (iter != parents_.end()) {
 212     (*iter)->RemoveObserver(this);
 213     parents_.erase(iter);
 214   }
 215 }
 216
 217 // We ignore |default_extension|.
 218 void SelectFileDialogImplGTK::SelectFileImpl(
 219     Type type,
 220     const base::string16& title,
 221     const base::FilePath& default_path,
 222     const FileTypeInfo* file_types,
 223     int file_type_index,
 224     const base::FilePath::StringType& default_extension,
 225     gfx::NativeWindow owning_window,
 226     void* params) {
 227   type_ = type;
 228   // |owning_window| can be null when user right-clicks on a downloadable item
 229   // and chooses 'Open Link in New Tab' when 'Ask where to save each file
 230   // before downloading.' preference is turned on. (http://crbug.com/29213)
 231   if (owning_window) {
 232     owning_window->AddObserver(this);
 233     parents_.insert(owning_window);
 234   }
 235
 236   std::string title_string = base::UTF16ToUTF8(title);
 237
 238   file_type_index_ = file_type_index;
 239   if (file_types)
 240     file_types_ = *file_types;
 241
 242   GtkWidget* dialog = NULL;
 243   switch (type) {
 244     case SELECT_FOLDER:
 245     case SELECT_UPLOAD_FOLDER:
 246       dialog = CreateSelectFolderDialog(type, title_string, default_path,
 247                                         owning_window);
 248       break;
 249     case SELECT_OPEN_FILE:
 250       dialog = CreateFileOpenDialog(title_string, default_path, owning_window);
 251       break;
 252     case SELECT_OPEN_MULTI_FILE:
 253       dialog = CreateMultiFileOpenDialog(title_string, default_path,
 254                                          owning_window);
 255       break;
 256     case SELECT_SAVEAS_FILE:
 257       dialog = CreateSaveAsDialog(title_string, default_path, owning_window);
 258       break;
 259     default:
 260       NOTREACHED();
 261       return;
 262   }
 263   g_signal_connect(dialog, "delete-event",
 264                    G_CALLBACK(gtk_widget_hide_on_delete), NULL);
 265   dialogs_.insert(dialog);
 266
 267   preview_ = gtk_image_new();
 268   g_signal_connect(dialog, "destroy",
 269                    G_CALLBACK(OnFileChooserDestroyThunk), this);
 270   g_signal_connect(dialog, "update-preview",
 271                    G_CALLBACK(OnUpdatePreviewThunk), this);
 272   gtk_file_chooser_set_preview_widget(GTK_FILE_CHOOSER(dialog), preview_);
 273
 274   params_map_[dialog] = params;
 275
 276   // TODO(erg): Figure out how to fake GTK window-to-parent modality without
 277   // having the parent be a real GtkWindow.
 278   gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
 279
 280   gtk_widget_show_all(dialog);
 281
 282   // We need to call gtk_window_present after making the widgets visible to make
 283   // sure window gets correctly raised and gets focus.
 284   int time = views::X11DesktopHandler::get()->wm_user_time_ms();
 285   gtk_window_present_with_time(GTK_WINDOW(dialog), time);
 286 }
 287
 288 void SelectFileDialogImplGTK::AddFilters(GtkFileChooser* chooser) {
 289   for (size_t i = 0; i < file_types_.extensions.size(); ++i) {
 290     GtkFileFilter* filter = NULL;
 291     std::set<std::string> fallback_labels;
 292
 293     for (size_t j = 0; j < file_types_.extensions[i].size(); ++j) {
 294       const std::string& current_extension = file_types_.extensions[i][j];
 295       if (!current_extension.empty()) {
 296         if (!filter)
 297           filter = gtk_file_filter_new();
 298         scoped_ptr<std::string> file_extension(
 299             new std::string("." + current_extension));
 300         fallback_labels.insert(std::string("*").append(*file_extension));
 301         gtk_file_filter_add_custom(
 302             filter,
 303             GTK_FILE_FILTER_FILENAME,
 304             reinterpret_cast<GtkFileFilterFunc>(FileFilterCaseInsensitive),
 305             file_extension.release(),
 306             reinterpret_cast<GDestroyNotify>(OnFileFilterDataDestroyed));
 307       }
 308     }
 309     // We didn't find any non-empty extensions to filter on.
 310     if (!filter)
 311       continue;
 312
 313     // The description vector may be blank, in which case we are supposed to
 314     // use some sort of default description based on the filter.
 315     if (i < file_types_.extension_description_overrides.size()) {
 316       gtk_file_filter_set_name(filter, base::UTF16ToUTF8(
 317           file_types_.extension_description_overrides[i]).c_str());
 318     } else {
 319       // There is no system default filter description so we use
 320       // the extensions themselves if the description is blank.
 321       std::vector<std::string> fallback_labels_vector(fallback_labels.begin(),
 322                                                       fallback_labels.end());
 323       std::string fallback_label = JoinString(fallback_labels_vector, ',');
 324       gtk_file_filter_set_name(filter, fallback_label.c_str());
 325     }
 326
 327     gtk_file_chooser_add_filter(chooser, filter);
 328     if (i == file_type_index_ - 1)
 329       gtk_file_chooser_set_filter(chooser, filter);
 330   }
 331
 332   // Add the *.* filter, but only if we have added other filters (otherwise it
 333   // is implied).
 334   if (file_types_.include_all_files && !file_types_.extensions.empty()) {
 335     GtkFileFilter* filter = gtk_file_filter_new();
 336     gtk_file_filter_add_pattern(filter, "*");
 337     gtk_file_filter_set_name(filter,
 338         l10n_util::GetStringUTF8(IDS_SAVEAS_ALL_FILES).c_str());
 339     gtk_file_chooser_add_filter(chooser, filter);
 340   }
 341 }
 342
 343 void SelectFileDialogImplGTK::FileSelected(GtkWidget* dialog,
 344                                            const base::FilePath& path) {
 345   if (type_ == SELECT_SAVEAS_FILE) {
 346     *last_saved_path_ = path.DirName();
 347   } else if (type_ == SELECT_OPEN_FILE || type_ == SELECT_FOLDER ||
 348              type_ == SELECT_UPLOAD_FOLDER) {
 349     *last_opened_path_ = path.DirName();
 350   } else {
 351     NOTREACHED();
 352   }
 353
 354   if (listener_) {
 355     GtkFileFilter* selected_filter =
 356         gtk_file_chooser_get_filter(GTK_FILE_CHOOSER(dialog));
 357     GSList* filters = gtk_file_chooser_list_filters(GTK_FILE_CHOOSER(dialog));
 358     int idx = g_slist_index(filters, selected_filter);
 359     g_slist_free(filters);
 360     listener_->FileSelected(path, idx + 1, PopParamsForDialog(dialog));
 361   }
 362   gtk_widget_destroy(dialog);
 363 }
 364
 365 void SelectFileDialogImplGTK::MultiFilesSelected(GtkWidget* dialog,
 366     const std::vector<base::FilePath>& files) {
 367     *last_opened_path_ = files[0].DirName();
 368
 369   if (listener_)
 370     listener_->MultiFilesSelected(files, PopParamsForDialog(dialog));
 371   gtk_widget_destroy(dialog);
 372 }
 373
 374 void SelectFileDialogImplGTK::FileNotSelected(GtkWidget* dialog) {
 375   void* params = PopParamsForDialog(dialog);
 376   if (listener_)
 377     listener_->FileSelectionCanceled(params);
 378   gtk_widget_destroy(dialog);
 379 }
 380
 381 GtkWidget* SelectFileDialogImplGTK::CreateFileOpenHelper(
 382     const std::string& title,
 383     const base::FilePath& default_path,
 384     gfx::NativeWindow parent) {
 385   GtkWidget* dialog =
 386       gtk_file_chooser_dialog_new(title.c_str(), NULL,
 387                                   GTK_FILE_CHOOSER_ACTION_OPEN,
 388                                   GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
 389                                   GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
 390                                   NULL);
 391   SetGtkTransientForAura(dialog, parent);
 392   AddFilters(GTK_FILE_CHOOSER(dialog));
 393
 394   if (!default_path.empty()) {
 395     if (CallDirectoryExistsOnUIThread(default_path)) {
 396       gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog),
 397                                           default_path.value().c_str());
 398     } else {
 399       // If the file doesn't exist, this will just switch to the correct
 400       // directory. That's good enough.
 401       gtk_file_chooser_set_filename(GTK_FILE_CHOOSER(dialog),
 402                                     default_path.value().c_str());
 403     }
 404   } else if (!last_opened_path_->empty()) {
 405     gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog),
 406                                         last_opened_path_->value().c_str());
 407   }
 408   return dialog;
 409 }
 410
 411 GtkWidget* SelectFileDialogImplGTK::CreateSelectFolderDialog(
 412     Type type,
 413     const std::string& title,
 414     const base::FilePath& default_path,
 415     gfx::NativeWindow parent) {
 416   std::string title_string = title;
 417   if (title_string.empty()) {
 418     title_string = (type == SELECT_UPLOAD_FOLDER) ?
 419         l10n_util::GetStringUTF8(IDS_SELECT_UPLOAD_FOLDER_DIALOG_TITLE) :
 420         l10n_util::GetStringUTF8(IDS_SELECT_FOLDER_DIALOG_TITLE);
 421   }
 422   std::string accept_button_label = (type == SELECT_UPLOAD_FOLDER) ?
 423       l10n_util::GetStringUTF8(IDS_SELECT_UPLOAD_FOLDER_DIALOG_UPLOAD_BUTTON) :
 424       GTK_STOCK_OPEN;
 425
 426   GtkWidget* dialog =
 427       gtk_file_chooser_dialog_new(title_string.c_str(), NULL,
 428                                   GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER,
 429                                   GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
 430                                   accept_button_label.c_str(),
 431                                   GTK_RESPONSE_ACCEPT,
 432                                   NULL);
 433   SetGtkTransientForAura(dialog, parent);
 434
 435   if (!default_path.empty()) {
 436     gtk_file_chooser_set_filename(GTK_FILE_CHOOSER(dialog),
 437                                   default_path.value().c_str());
 438   } else if (!last_opened_path_->empty()) {
 439     gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog),
 440                                         last_opened_path_->value().c_str());
 441   }
 442   gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dialog), FALSE);
 443   g_signal_connect(dialog, "response",
 444                    G_CALLBACK(OnSelectSingleFolderDialogResponseThunk), this);
 445   return dialog;
 446 }
 447
 448 GtkWidget* SelectFileDialogImplGTK::CreateFileOpenDialog(
 449     const std::string& title,
 450     const base::FilePath& default_path,
 451     gfx::NativeWindow parent) {
 452   std::string title_string = !title.empty() ? title :
 453         l10n_util::GetStringUTF8(IDS_OPEN_FILE_DIALOG_TITLE);
 454
 455   GtkWidget* dialog = CreateFileOpenHelper(title_string, default_path, parent);
 456   gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dialog), FALSE);
 457   g_signal_connect(dialog, "response",
 458                    G_CALLBACK(OnSelectSingleFileDialogResponseThunk), this);
 459   return dialog;
 460 }
 461
 462 GtkWidget* SelectFileDialogImplGTK::CreateMultiFileOpenDialog(
 463     const std::string& title,
 464     const base::FilePath& default_path,
 465     gfx::NativeWindow parent) {
 466   std::string title_string = !title.empty() ? title :
 467         l10n_util::GetStringUTF8(IDS_OPEN_FILES_DIALOG_TITLE);
 468
 469   GtkWidget* dialog = CreateFileOpenHelper(title_string, default_path, parent);
 470   gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dialog), TRUE);
 471   g_signal_connect(dialog, "response",
 472                    G_CALLBACK(OnSelectMultiFileDialogResponseThunk), this);
 473   return dialog;
 474 }
 475
 476 GtkWidget* SelectFileDialogImplGTK::CreateSaveAsDialog(const std::string& title,
 477     const base::FilePath& default_path, gfx::NativeWindow parent) {
 478   std::string title_string = !title.empty() ? title :
 479         l10n_util::GetStringUTF8(IDS_SAVE_AS_DIALOG_TITLE);
 480
 481   GtkWidget* dialog =
 482       gtk_file_chooser_dialog_new(title_string.c_str(), NULL,
 483                                   GTK_FILE_CHOOSER_ACTION_SAVE,
 484                                   GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
 485                                   GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
 486                                   NULL);
 487   SetGtkTransientForAura(dialog, parent);
 488
 489   AddFilters(GTK_FILE_CHOOSER(dialog));
 490   if (!default_path.empty()) {
 491     // Since the file may not already exist, we use
 492     // set_current_folder() followed by set_current_name(), as per the
 493     // recommendation of the GTK docs.
 494     gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog),
 495         default_path.DirName().value().c_str());
 496     gtk_file_chooser_set_current_name(GTK_FILE_CHOOSER(dialog),
 497         default_path.BaseName().value().c_str());
 498   } else if (!last_saved_path_->empty()) {
 499     gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog),
 500                                         last_saved_path_->value().c_str());
 501   }
 502   gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dialog), FALSE);
 503   gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(dialog),
 504                                                  TRUE);
 505   g_signal_connect(dialog, "response",
 506                    G_CALLBACK(OnSelectSingleFileDialogResponseThunk), this);
 507   return dialog;
 508 }
 509
 510 void* SelectFileDialogImplGTK::PopParamsForDialog(GtkWidget* dialog) {
 511   std::map<GtkWidget*, void*>::iterator iter = params_map_.find(dialog);
 512   DCHECK(iter != params_map_.end());
 513   void* params = iter->second;
 514   params_map_.erase(iter);
 515   return params;
 516 }
 517
 518 void SelectFileDialogImplGTK::FileDialogDestroyed(GtkWidget* dialog) {
 519   dialogs_.erase(dialog);
 520
 521   // Parent may be NULL in a few cases: 1) on shutdown when
 522   // AllBrowsersClosed() trigger this handler after all the browser
 523   // windows got destroyed, or 2) when the parent tab has been opened by
 524   // 'Open Link in New Tab' context menu on a downloadable item and
 525   // the tab has no content (see the comment in SelectFile as well).
 526   aura::Window* parent = GetAuraTransientParent(dialog);
 527   if (!parent)
 528     return;
 529   std::set<aura::Window*>::iterator iter = parents_.find(parent);
 530   if (iter != parents_.end()) {
 531     (*iter)->RemoveObserver(this);
 532     parents_.erase(iter);
 533   } else {
 534     NOTREACHED();
 535   }
 536 }
 537
 538 bool SelectFileDialogImplGTK::IsCancelResponse(gint response_id) {
 539   bool is_cancel = response_id == GTK_RESPONSE_CANCEL ||
 540                    response_id == GTK_RESPONSE_DELETE_EVENT;
 541   if (is_cancel)
 542     return true;
 543
 544   DCHECK(response_id == GTK_RESPONSE_ACCEPT);
 545   return false;
 546 }
 547
 548 void SelectFileDialogImplGTK::SelectSingleFileHelper(GtkWidget* dialog,
 549     gint response_id,
 550     bool allow_folder) {
 551   if (IsCancelResponse(response_id)) {
 552     FileNotSelected(dialog);
 553     return;
 554   }
 555
 556   gchar* filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
 557   if (!filename) {
 558     FileNotSelected(dialog);
 559     return;
 560   }
 561
 562   base::FilePath path(filename);
 563   g_free(filename);
 564
 565   if (allow_folder) {
 566     FileSelected(dialog, path);
 567     return;
 568   }
 569
 570   if (CallDirectoryExistsOnUIThread(path))
 571     FileNotSelected(dialog);
 572   else
 573     FileSelected(dialog, path);
 574 }
 575
 576 void SelectFileDialogImplGTK::OnSelectSingleFileDialogResponse(
 577     GtkWidget* dialog, int response_id) {
 578   SelectSingleFileHelper(dialog, response_id, false);
 579 }
 580
 581 void SelectFileDialogImplGTK::OnSelectSingleFolderDialogResponse(
 582     GtkWidget* dialog, int response_id) {
 583   SelectSingleFileHelper(dialog, response_id, true);
 584 }
 585
 586 void SelectFileDialogImplGTK::OnSelectMultiFileDialogResponse(GtkWidget* dialog,
 587                                                               int response_id) {
 588   if (IsCancelResponse(response_id)) {
 589     FileNotSelected(dialog);
 590     return;
 591   }
 592
 593   GSList* filenames = gtk_file_chooser_get_filenames(GTK_FILE_CHOOSER(dialog));
 594   if (!filenames) {
 595     FileNotSelected(dialog);
 596     return;
 597   }
 598
 599   std::vector<base::FilePath> filenames_fp;
 600   for (GSList* iter = filenames; iter != NULL; iter = g_slist_next(iter)) {
 601     base::FilePath path(static_cast<char*>(iter->data));
 602     g_free(iter->data);
 603     if (CallDirectoryExistsOnUIThread(path))
 604       continue;
 605     filenames_fp.push_back(path);
 606   }
 607   g_slist_free(filenames);
 608
 609   if (filenames_fp.empty()) {
 610     FileNotSelected(dialog);
 611     return;
 612   }
 613   MultiFilesSelected(dialog, filenames_fp);
 614 }
 615
 616 void SelectFileDialogImplGTK::OnFileChooserDestroy(GtkWidget* dialog) {
 617   FileDialogDestroyed(dialog);
 618 }
 619
 620 void SelectFileDialogImplGTK::OnUpdatePreview(GtkWidget* chooser) {
 621   gchar* filename = gtk_file_chooser_get_preview_filename(
 622       GTK_FILE_CHOOSER(chooser));
 623   if (!filename)
 624     return;
 625   // This will preserve the image's aspect ratio.
 626   GdkPixbuf* pixbuf = gdk_pixbuf_new_from_file_at_size(filename, kPreviewWidth,
 627                                                        kPreviewHeight, NULL);
 628   g_free(filename);
 629   if (pixbuf) {
 630     gtk_image_set_from_pixbuf(GTK_IMAGE(preview_), pixbuf);
 631     g_object_unref(pixbuf);
 632   }
 633   gtk_file_chooser_set_preview_widget_active(GTK_FILE_CHOOSER(chooser),
 634                                              pixbuf ? TRUE : FALSE);
 635 }
 636
 637 }  // namespace libgtk2ui