ListBox.h

#pragma once
 
#include "ItemsControl.h"
#include "ObservableCollection.h"
 
namespace sw
{
    class ListBox : public ItemsControl
    {
    private:
        using TBase = ItemsControl;
 
        ObservableCollection<std::wstring> _items;
 
        double _itemHeight = -1;
 
        Color _selectedItemBackColor{GetSysColor(COLOR_HIGHLIGHT)};
 
        Color _selectedItemTextColor{GetSysColor(COLOR_HIGHLIGHTTEXT)};
 
    public:
        const ReadOnlyProperty<ObservableCollection<std::wstring> *> Items;
 
        const Property<double> ItemHeight;
 
        const Property<int> TopIndex;
 
        const Property<Color> SelectedItemBackColor;
 
        const Property<Color> SelectedItemTextColor;
 
    public:
        ListBox();
 
        void Refresh();
 
        int GetItemIndexFromPoint(const Point &point);
 
    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 void FontChanged(HFONT hfont) override;
 
        virtual void OnCommand(int code) override;
 
        virtual bool OnContextMenu(bool isKeyboardMsg, const Point &mousePosition) override;
 
        virtual bool OnDrawItemSelf(DRAWITEMSTRUCT *pDrawItem) override;
 
        virtual std::wstring GetDisplayText(int index, const Variant &item);
 
    private:
        void _SetCount(int count);
 
        void _UpdateCount();
 
        void _UpdateItemHeight();
    };
}