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#ifndef DRAG_H
#define DRAG_H
#include <windows.h>
/* Dragger objects implement draggable portions of the client area,
* such as the split between two list views. HandleLButtonDown and
* HandleSetCursor are called by relevant window procedures upon
* WM_(NC)LBUTTONDOWN and WM_SETCURSOR. */
struct Window;
struct Dragger
{
Window& parent;
bool HandleLButtonDown();
bool HandleSetCursor();
inline Dragger(Window& parent) : parent(parent) {}
protected:
bool IsDown() const;
bool IsDouble(const long time, const POINT& pt);
virtual bool InDragArea(int x, int y) const = 0;
/* Perform drag, resizing relevant windows. */
virtual void Drag(int x, int y) const = 0;
/* Reset dragger to automatic position. */
virtual void Reset() const = 0;
/* Called after drag, when mouse button is released. */
virtual void Done() const = 0;
private:
bool m_bActive = false;
long m_time0 = 0;
POINT m_pt0 = {0, 0};
};
/* DlvDragger implements the draggable split between the data list
* view and the episode list view. */
struct DlvDragger : public Dragger
{
inline DlvDragger(Window& parent) : Dragger(parent) {}
private:
bool InDragArea(int x, int y) const override;
void Drag(int x, int y) const override;
void Reset() const override;
void Done() const override;
};
#endif
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