text: //
  // Copyright (c) 2008-2020 the Urho3D project.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #include "../Precompiled.h"
  
  #include "../Core/Context.h"
  #include "../IO/Log.h"
  #include "../Resource/ResourceCache.h"
  #include "../Resource/XMLFile.h"
  #include "../UI/Button.h"
  #include "../UI/MessageBox.h"
  #include "../UI/Text.h"
  #include "../UI/UI.h"
  #include "../UI/UIEvents.h"
  #include "../UI/Window.h"
  
  namespace Urho3D
  {
  
  MessageBox::MessageBox(Context* context, const ea::string& messageString, const ea::string& titleString, XMLFile* layoutFile,
      XMLFile* styleFile) :
      Object(context),
      window_(nullptr),
      titleText_(nullptr),
      messageText_(nullptr),
      okButton_(nullptr)
  {
      // If layout file is not given, use the default message box layout
      if (!layoutFile)
      {
          auto* cache = GetSubsystem<ResourceCache>();
          layoutFile = cache->GetResource<XMLFile>("UI/MessageBox.xml");
          if (!layoutFile)    // Error is already logged
              return;         // Note: windowless MessageBox should not be used!
      }
  
      auto* ui = GetSubsystem<UI>();
      UIElement* root = ui->GetRoot();
      {
          SharedPtr<UIElement> holder = ui->LoadLayout(layoutFile, styleFile);
          if (!holder)    // Error is already logged
              return;
          window_ = holder;
          root->AddChild(window_);    // Take ownership of the object before SharedPtr goes out of scope
      }
  
      // Set the title and message strings if they are given
      titleText_ = window_->GetChildDynamicCast<Text>("TitleText", true);
      if (titleText_ && !titleString.empty())
          titleText_->SetText(titleString);
      messageText_ = window_->GetChildDynamicCast<Text>("MessageText", true);
      if (messageText_ && !messageString.empty())
          messageText_->SetText(messageString);
  
      // Center window after the message is set
      auto* window = dynamic_cast<Window*>(window_);
      if (window)
      {
          const IntVector2& size = window->GetSize();
          window->SetPosition((root->GetWidth() - size.x_) / 2, (root->GetHeight() - size.y_) / 2);
          window->SetModal(true);
          SubscribeToEvent(window, E_MODALCHANGED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
      }
  
      // Bind the buttons (if any in the loaded UI layout) to event handlers
      okButton_ = window_->GetChildDynamicCast<Button>("OkButton", true);
      if (okButton_)
      {
          ui->SetFocusElement(okButton_);
          SubscribeToEvent(okButton_, E_RELEASED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
      }
      auto* cancelButton = window_->GetChildDynamicCast<Button>("CancelButton", true);
      if (cancelButton)
          SubscribeToEvent(cancelButton, E_RELEASED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
      auto* closeButton = window_->GetChildDynamicCast<Button>("CloseButton", true);
      if (closeButton)
          SubscribeToEvent(closeButton, E_RELEASED, URHO3D_HANDLER(MessageBox, HandleMessageAcknowledged));
  
      // Increase reference count to keep Self alive
      AddRef();
  }
  
  MessageBox::~MessageBox()
  {
      // This would remove the UI-element regardless of whether it is parented to UI's root or UI's modal-root
      if (window_)
          window_->Remove();
  }
  
  void MessageBox::RegisterObject(Context* context)
  {
      context->RegisterFactory<MessageBox>();
  }
  
  void MessageBox::SetTitle(const ea::string& text)
  {
      if (titleText_)
          titleText_->SetText(text);
  }
  
  void MessageBox::SetMessage(const ea::string& text)
  {
      if (messageText_)
          messageText_->SetText(text);
  }
  
  const ea::string& MessageBox::GetTitle() const
  {
      return titleText_ ? titleText_->GetText() : EMPTY_STRING;
  }
  
  const ea::string& MessageBox::GetMessage() const
  {
      return messageText_ ? messageText_->GetText() : EMPTY_STRING;
  }
  
  void MessageBox::HandleMessageAcknowledged(StringHash eventType, VariantMap& eventData)
  {
      using namespace MessageACK;
  
      VariantMap& newEventData = GetEventDataMap();
      newEventData[P_OK] = eventData[Released::P_ELEMENT] == okButton_;
      SendEvent(E_MESSAGEACK, newEventData);
  
      // Explicitly remove from UI. Releasing reference will not destroy object immediately if it is used from C#.
      window_->Remove();
  
      // Self destruct
      ReleaseRef();
  }
  
  }
  