mfc_mouse_click - 8BitsCoding/RobotMentor GitHub Wiki

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위 처럼 네모를 클릭 후 드래그 하면 이동하게 만들고 싶다.

// Dlg.h
CRect m_rect;
char m_is_clicked = 0;
CPoint m_prev_pos;

afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
afx_msg void OnMouseMove(UINT nFlags, CPoint point);

void CMFCApplication5Dlg::OnPaint()
{
	CPaintDC dc(this); // 그리기를 위한 디바이스 컨텍스트입니다.

	if (IsIconic())
	{
        // ...
	}
	else
	{
		dc.Rectangle(m_rect);
		// CDialogEx::OnPaint();
	}
}

void CMFCApplication5Dlg::OnLButtonDown(UINT nFlags, CPoint point)
{
	//if (point.x >= m_rect.left && point.y >= m_rect.top && 
	//	point.x <= m_rect.right && point.y <= m_rect.bottom)
	if(m_rect.PtInRect(point))
	{
		m_is_clicked = 1;
		m_prev_pos = point;
		SetCapture();
	}

	CDialogEx::OnLButtonDown(nFlags, point);
}

void CMFCApplication5Dlg::OnLButtonUp(UINT nFlags, CPoint point)
{
	if (m_is_clicked == 1) {
		m_is_clicked = 0;
		ReleaseCapture();
	}

	CDialogEx::OnLButtonUp(nFlags, point);
}

void CMFCApplication5Dlg::OnMouseMove(UINT nFlags, CPoint point)
{
	if (m_is_clicked == 1) {
		CPoint move_pos;
		move_pos = point - m_prev_pos;

		m_rect = m_rect + move_pos;

		/*
		m_rect.left += move_pos.x;
		m_rect.top += move_pos.y;
		m_rect.right += move_pos.x;
		m_rect.bottom += move_pos.y;
		*/

		m_prev_pos = point;

		Invalidate();
	}

	CDialogEx::OnMouseMove(nFlags, point);
}