ItemsControl.h

#pragma once
 
#include "Control.h"
#include "IList.h"
#include "INotifyCollectionChanged.h"
 
namespace sw
{
    class ItemsControl : public Control
    {
    private:
        IList *_itemsSource = nullptr;
 
        struct {
            IList *itemsSource = nullptr;
 
            INotifyCollectionChanged *notifyCollectionChanged = nullptr;
        } _current;
 
    public:
        const Property<IList *> ItemsSource;
 
        const ReadOnlyProperty<int> ItemsCount;
 
        const Property<int> SelectedIndex;
 
        const ReadOnlyProperty<Variant> SelectedItem;
 
    public:
        ItemsControl();
 
    protected:
        IList *GetCurrentItemsSource();
 
        void UpdateCurrentItemsSource();
 
        virtual void OnSelectionChanged();
 
    private:
        void _CollectionChangedEventHandler(
            INotifyCollectionChanged &sender, NotifyCollectionChangedEventArgs &args);
 
    protected:
        virtual IList *GetDefaultItemsSource() = 0;
 
        virtual void OnCurrentItemsSourceChanged(IList *oldItemsSource, IList *newItemsSource) = 0;
 
        virtual void OnCurrentItemsSourceCollectionChanged(const NotifyCollectionChangedEventArgs &args) = 0;
 
        virtual int GetSelectedIndex() = 0;
 
        virtual void SetSelectedIndex(int index) = 0;
    };
}