#ifndef LAYOUT_H
#define LAYOUT_H

#include <windows.h>

#include "common.h"
#include "datalistview.h"

void UpdateLayout(int w = 0, int h = 0);

struct Dragger
{
	bool HandleDown();
	bool HandleMove();
private:
	bool InDragArea(int x, int y);
	bool IsDown();
	bool IsDouble();
	void Drag(int x, int y);
	bool m_bActive = false;
	long m_time = 0;
};

inline bool Dragger::IsDouble()
{
	const long time = GetMessageTime();
	const bool dbl = time-m_time <= static_cast<long>(GetDoubleClickTime());
	m_time = time;
	return dbl;
}

inline bool Dragger::IsDown()
{
	return GetKeyState(VK_LBUTTON) & 0x8000;
}

inline bool Dragger::HandleDown()
{
	extern HWND g_hWnd;
	POINT pt;
	require(GetRelativeCursorPos(g_hWnd, &pt));
	if (!InDragArea(pt.x, pt.y)) return false;

	if (IsDouble()) {
		extern DataListView* g_dlv;
		g_dlv->SetHeight(0);
		UpdateLayout();
		return false;
	} else
		return m_bActive = true;
}

inline bool Dragger::HandleMove()
{
	extern HWND g_hWnd;
	POINT pt;
	require(GetRelativeCursorPos(g_hWnd, &pt));

	extern HCURSOR g_hcSizeNs;
	bool r = true;
	if (InDragArea(pt.x, pt.y))
		SetCursor(g_hcSizeNs);
	else
		r = false;
	if (m_bActive)
		Drag(pt.x, pt.y);
	if (!IsDown())
		m_bActive = false;
	return r;
}

#endif