chrome/browser/ui/app_modal_dialogs/app_modal_dialog_queue.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 "chrome/browser/ui/app_modal_dialogs/app_modal_dialog_queue.h"
   6
   7 #include "base/memory/singleton.h"
   8 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
   9
  10 // static
  11 AppModalDialogQueue* AppModalDialogQueue::GetInstance() {
  12   return Singleton<AppModalDialogQueue>::get();
  13 }
  14
  15 void AppModalDialogQueue::AddDialog(AppModalDialog* dialog) {
  16   if (!active_dialog_) {
  17     ShowModalDialog(dialog);
  18     return;
  19   }
  20   app_modal_dialog_queue_.push_back(dialog);
  21 }
  22
  23 void AppModalDialogQueue::ShowNextDialog() {
  24   AppModalDialog* dialog = GetNextDialog();
  25   if (dialog)
  26     ShowModalDialog(dialog);
  27   else
  28     active_dialog_ = NULL;
  29 }
  30
  31 void AppModalDialogQueue::ActivateModalDialog() {
  32   if (showing_modal_dialog_) {
  33     // As part of showing a modal dialog we may end up back in this method
  34     // (showing a dialog activates the WebContents, which can trigger a call
  35     // to ActivateModalDialog). We ignore such a request as after the call to
  36     // activate the tab contents the dialog is shown.
  37     return;
  38   }
  39   if (active_dialog_)
  40     active_dialog_->ActivateModalDialog();
  41 }
  42
  43 bool AppModalDialogQueue::HasActiveDialog() const {
  44   return active_dialog_ != NULL;
  45 }
  46
  47 AppModalDialogQueue::AppModalDialogQueue()
  48     : active_dialog_(NULL),
  49       showing_modal_dialog_(false) {
  50 }
  51
  52 AppModalDialogQueue::~AppModalDialogQueue() {
  53 }
  54
  55 void AppModalDialogQueue::ShowModalDialog(AppModalDialog* dialog) {
  56   // Be sure and set the active_dialog_ field first, otherwise if
  57   // ShowModalDialog triggers a call back to the queue they'll get the old
  58   // dialog. Also, if the dialog calls |ShowNextDialog()| before returning, that
  59   // would write NULL into |active_dialog_| and this function would then undo
  60   // that.
  61   active_dialog_ = dialog;
  62   showing_modal_dialog_ = true;
  63   dialog->ShowModalDialog();
  64   showing_modal_dialog_ = false;
  65 }
  66
  67 AppModalDialog* AppModalDialogQueue::GetNextDialog() {
  68   while (!app_modal_dialog_queue_.empty()) {
  69     AppModalDialog* dialog = app_modal_dialog_queue_.front();
  70     app_modal_dialog_queue_.pop_front();
  71     if (dialog->IsValid())
  72       return dialog;
  73     delete dialog;
  74   }
  75   return NULL;
  76 }