components/app_modal/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 "components/app_modal/app_modal_dialog_queue.h"
   6
   7 #include "base/memory/singleton.h"
   8 #include "components/app_modal/app_modal_dialog.h"
   9
  10 namespace app_modal {
  11
  12 // static
  13 AppModalDialogQueue* AppModalDialogQueue::GetInstance() {
  14   return Singleton<AppModalDialogQueue>::get();
  15 }
  16
  17 void AppModalDialogQueue::AddDialog(AppModalDialog* dialog) {
  18   if (!active_dialog_) {
  19     ShowModalDialog(dialog);
  20     return;
  21   }
  22   app_modal_dialog_queue_.push_back(dialog);
  23 }
  24
  25 void AppModalDialogQueue::ShowNextDialog() {
  26   AppModalDialog* dialog = GetNextDialog();
  27   if (dialog)
  28     ShowModalDialog(dialog);
  29   else
  30     active_dialog_ = NULL;
  31 }
  32
  33 void AppModalDialogQueue::ActivateModalDialog() {
  34   if (showing_modal_dialog_) {
  35     // As part of showing a modal dialog we may end up back in this method
  36     // (showing a dialog activates the WebContents, which can trigger a call
  37     // to ActivateModalDialog). We ignore such a request as after the call to
  38     // activate the tab contents the dialog is shown.
  39     return;
  40   }
  41   if (active_dialog_)
  42     active_dialog_->ActivateModalDialog();
  43 }
  44
  45 bool AppModalDialogQueue::HasActiveDialog() const {
  46   return active_dialog_ != NULL;
  47 }
  48
  49 AppModalDialogQueue::AppModalDialogQueue()
  50     : active_dialog_(NULL),
  51       showing_modal_dialog_(false) {
  52 }
  53
  54 AppModalDialogQueue::~AppModalDialogQueue() {
  55 }
  56
  57 void AppModalDialogQueue::ShowModalDialog(AppModalDialog* dialog) {
  58   // Be sure and set the active_dialog_ field first, otherwise if
  59   // ShowModalDialog triggers a call back to the queue they'll get the old
  60   // dialog. Also, if the dialog calls |ShowNextDialog()| before returning, that
  61   // would write NULL into |active_dialog_| and this function would then undo
  62   // that.
  63   active_dialog_ = dialog;
  64   showing_modal_dialog_ = true;
  65   dialog->ShowModalDialog();
  66   showing_modal_dialog_ = false;
  67 }
  68
  69 AppModalDialog* AppModalDialogQueue::GetNextDialog() {
  70   while (!app_modal_dialog_queue_.empty()) {
  71     AppModalDialog* dialog = app_modal_dialog_queue_.front();
  72     app_modal_dialog_queue_.pop_front();
  73     if (dialog->IsValid())
  74       return dialog;
  75     delete dialog;
  76   }
  77   return NULL;
  78 }
  79
  80 }  // namespace app_modal