DockSplitter.h

#pragma once
 
#include "DockLayout.h"
#include "Splitter.h"
 
namespace sw
{
    class DockSplitter : public Splitter
    {
    private:
        using TBase = Splitter;
 
        HCURSOR _hCurHorz = NULL;
 
        HCURSOR _hCurVert = NULL;
 
        UIElement *_relatedElement = nullptr;
 
        sw::Point _initialMousePos{};
 
        sw::Size _initialRelatedElementSize{};
 
    public:
        DockSplitter();
 
        void CancelDrag(bool restoreSize = false);
 
    protected:
        virtual bool OnMouseLeftButtonDown(const Point &mousePosition, MouseKey keyState) override;
 
        virtual bool OnMouseLeftButtonUp(const Point &mousePosition, MouseKey keyState) override;
 
        virtual bool OnMouseMove(const Point &mousePosition, MouseKey keyState) override;
 
        virtual bool OnKillFocus(HWND hNextFocus) override;
 
        virtual bool OnKeyDown(VirtualKey key, const KeyFlags &flags) override;
 
        virtual bool OnSetCursor(HWND hwnd, HitTestResult hitTest, int message, bool &result) override;
 
    private:
        void _OnStartDrag();
 
        void _OnEndDrag(bool restoreSize);
 
        void _OnDragMove();
 
        void _UpdateRelatedElement();
 
        UIElement *_FindPreviousElement(UIElement *parent, int startIndex, sw::DockLayoutTag tag);
    };
}