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      1 // Copyright (c) 2011 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 
      9 void AppModalDialogQueue::AddDialog(AppModalDialog* dialog) {
     10   if (!active_dialog_) {
     11     ShowModalDialog(dialog);
     12     return;
     13   }
     14   app_modal_dialog_queue_.push(dialog);
     15 }
     16 
     17 void AppModalDialogQueue::ShowNextDialog() {
     18   AppModalDialog* dialog = GetNextDialog();
     19   if (dialog)
     20     ShowModalDialog(dialog);
     21   else
     22     active_dialog_ = NULL;
     23 }
     24 
     25 void AppModalDialogQueue::ActivateModalDialog() {
     26   if (showing_modal_dialog_) {
     27     // As part of showing a modal dialog we may end up back in this method
     28     // (showing a dialog activates the TabContents, which can trigger a call
     29     // to ActivateModalDialog). We ignore such a request as after the call to
     30     // activate the tab contents the dialog is shown.
     31     return;
     32   }
     33   if (active_dialog_)
     34     active_dialog_->ActivateModalDialog();
     35 }
     36 
     37 AppModalDialogQueue::AppModalDialogQueue()
     38     : active_dialog_(NULL), showing_modal_dialog_(false) {
     39 }
     40 
     41 AppModalDialogQueue::~AppModalDialogQueue() {}
     42 
     43 // static
     44 AppModalDialogQueue* AppModalDialogQueue::GetInstance() {
     45   return Singleton<AppModalDialogQueue>::get();
     46 }
     47 
     48 void AppModalDialogQueue::ShowModalDialog(AppModalDialog* dialog) {
     49   // Be sure and set the active_dialog_ field first, otherwise if
     50   // ShowModalDialog triggers a call back to the queue they'll get the old
     51   // dialog. Also, if the dialog calls |ShowNextDialog()| before returning, that
     52   // would write NULL into |active_dialog_| and this function would then undo
     53   // that.
     54   active_dialog_ = dialog;
     55   showing_modal_dialog_ = true;
     56   dialog->ShowModalDialog();
     57   showing_modal_dialog_ = false;
     58 }
     59 
     60 AppModalDialog* AppModalDialogQueue::GetNextDialog() {
     61   while (!app_modal_dialog_queue_.empty()) {
     62     AppModalDialog* dialog = app_modal_dialog_queue_.front();
     63     app_modal_dialog_queue_.pop();
     64     if (dialog->IsValid())
     65       return dialog;
     66     delete dialog;
     67   }
     68   return NULL;
     69 }
     70