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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 #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 }
     77