ComboBox.h

#pragma once
 
#include "ItemsControl.h"
#include "ObservableCollection.h"
 
namespace sw
{
    class ComboBox : public ItemsControl
    {
    private:
        using TBase = ItemsControl;
 
        bool _isTextChanged = false;
 
        ObservableCollection<std::wstring> _items;
 
    public:
        const ReadOnlyProperty<ObservableCollection<std::wstring> *> Items;
 
        const Property<bool> IsEditable;
 
    public:
        ComboBox();
 
        void Refresh();
 
        void ShowDropDown();
 
        void CloseDropDown();
 
    protected:
        virtual IList *GetDefaultItemsSource() override final;
 
        virtual void OnCurrentItemsSourceChanged(IList *oldItemsSource, IList *newItemsSource) override;
 
        virtual void OnCurrentItemsSourceCollectionChanged(const NotifyCollectionChangedEventArgs &args) override;
 
        virtual int GetSelectedIndex() override;
 
        virtual void SetSelectedIndex(int index) override;
 
        virtual std::wstring &GetInternalText() override;
 
        virtual void OnCommand(int code) override;
 
        virtual void OnSelectionChanged() override;
 
        virtual std::wstring GetDisplayText(int index, const Variant &item);
 
    private:
        void _UpdateSelectedText();
 
        void _UpdateItems();
 
        void _AddString(const std::wstring &str);
 
        void _InsertString(int index, const std::wstring &str);
 
        void _DeleteString(int index);
    };
}