text: //
  // Copyright (c) 2008-2015 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.
  //
  
  #pragma once
  
  #include "../UI/Menu.h"
  
  namespace Urho3D
  {
  
  class ListView;
  
  /// %Menu %UI element that displays a popup list view.
  class URHO3D_API DropDownList : public Menu
  {
      OBJECT(DropDownList)
  
  public:
      /// Construct.
      DropDownList(Context* context);
      /// Destruct.
      ~DropDownList();
      /// Register object factory.
      static void RegisterObject(Context* context);
  
      /// Apply attribute changes that can not be applied immediately.
      virtual void ApplyAttributes();
      /// Return UI rendering batches.
      virtual void GetBatches(PODVector<UIBatch>& batches, PODVector<float>& vertexData, const IntRect& currentScissor);
      /// React to the popup being shown.
      virtual void OnShowPopup();
      /// React to the popup being hidden.
      virtual void OnHidePopup();
      /// React to editable status change.
      virtual void OnSetEditable();
  
      /// Add item to the end of the list.
      void AddItem(UIElement* item);
      /// Insert item to a specific position.
      void InsertItem(unsigned index, UIElement* item);
      /// Remove specific item.
      void RemoveItem(UIElement* item);
      /// Remove item at index.
      void RemoveItem(unsigned index);
      /// Remove all items.
      void RemoveAllItems();
      /// Set selection.
      void SetSelection(unsigned index);
      /// Set place holder text. This is the text shown when there is no selection in drop down list.
      void SetPlaceholderText(const String& text);
      /// Set whether popup should be automatically resized to match the dropdown button width.
      void SetResizePopup(bool enable);
  
      /// Return number of items.
      unsigned GetNumItems() const;
      /// Return item at index.
      UIElement* GetItem(unsigned index) const;
      /// Return all items.
      PODVector<UIElement*> GetItems() const;
      /// Return selection index, or M_MAX_UNSIGNED if none selected.
      unsigned GetSelection() const;
      /// Return selected item, or null if none selected.
      UIElement* GetSelectedItem() const;
  
      /// Return listview element.
      ListView* GetListView() const { return listView_; }
  
      /// Return selected item placeholder element.
      UIElement* GetPlaceholder() const { return placeholder_; }
  
      /// Return place holder text.
      const String& GetPlaceholderText() const;
  
      /// Return whether popup should be automatically resized.
      bool GetResizePopup() const { return resizePopup_; }
  
      /// Set selection attribute.
      void SetSelectionAttr(unsigned index);
  
  protected:
      /// Filter implicit attributes in serialization process.
      virtual bool FilterImplicitAttributes(XMLElement& dest) const;
      /// Filter implicit attributes in serialization process.
      virtual bool FilterPopupImplicitAttributes(XMLElement& dest) const;
  
      /// Listview element.
      SharedPtr<ListView> listView_;
      /// Selected item placeholder element.
      SharedPtr<UIElement> placeholder_;
      /// Resize popup flag.
      bool resizePopup_;
  
  private:
      /// Handle listview item click event.
      void HandleItemClicked(StringHash eventType, VariantMap& eventData);
      /// Handle a key press from the listview
      void HandleListViewKey(StringHash eventType, VariantMap& eventData);
  
      /// Selected item index attribute.
      unsigned selectionAttr_;
  };
  
  }
  