Win32 C/C++ setting window position, http://johnmhsheep.pixnet.net/blog, https://johnmhsieh.blogspot.com/

WindowPosition.cpp

#include "WindowPosition.h"
//
CWndPos::CWndPos()
{
	InitStruct(&this->m_pos, SWndPos);
	InitStruct(&this->m_wndSize, SWndSize);
	this->m_sysSize.width = GetSystemMetrics(SM_CXSCREEN);
	this->m_sysSize.height = GetSystemMetrics(SM_CYSCREEN);
}
CWndPos::CWndPos(HWND hWnd)
{
	RECT r;
	InitStruct(&r, RECT);
	InitStruct(&this->m_pos, SWndPos);
	this->m_sysSize.width = GetSystemMetrics(SM_CXSCREEN);
	this->m_sysSize.height = GetSystemMetrics(SM_CYSCREEN);
	//
	// get size of a window or a dialog box
	GetWindowRect(hWnd, &r);
	this->m_wndSize.width = r.right - r.left;
	this->m_wndSize.height = r.bottom - r.top;
}
CWndPos::CWndPos(const SWndSize& ws)
{
	InitStruct(&this->m_pos, SWndPos);
	CopyStruct(&this->m_wndSize, &ws, SWndSize);
	this->m_sysSize.width = GetSystemMetrics(SM_CXSCREEN);
	this->m_sysSize.height = GetSystemMetrics(SM_CYSCREEN);
}
CWndPos::CWndPos(const CWndPos& wndpos)
{
	if (this == &wndpos)
	{
		return;
	}
	CopyStruct(&this->m_pos, &wndpos.m_pos, SWndPos);
	CopyStruct(&this->m_sysSize, &wndpos.m_sysSize, SWndSize);
	CopyStruct(&this->m_wndSize, &wndpos.m_wndSize, SWndSize);
}
CWndPos& CWndPos::operator=(const CWndPos& wndpos)
{
	if (this != &wndpos)
	{
		CopyStruct(&this->m_pos, &wndpos.m_pos, SWndPos);
		CopyStruct(&this->m_sysSize, &wndpos.m_sysSize, SWndSize);
		CopyStruct(&this->m_wndSize, &wndpos.m_wndSize, SWndSize);
	}
	return (*this);
}
CWndPos::~CWndPos()
{
	InitStruct(&this->m_pos, SWndPos);
	InitStruct(&this->m_sysSize, SWndPos);
	InitStruct(&this->m_wndSize, SWndSize);
}
void CWndPos::setWndSize(const SWndSize& ws)
{
	CopyStruct(&this->m_wndSize, &ws, SWndSize);
}
void CWndPos::setDefWndSize(HWND hWnd)
{
	RECT r;
	InitStruct(&r, RECT);
	//
	// get size of a window or a dialog box
	GetWindowRect(hWnd, &r);
	this->m_wndSize.width = r.right - r.left;
	this->m_wndSize.height = r.bottom - r.top;
}
void CWndPos::getWndSize(SWndSize& ws)
{
	ws.width = this->m_wndSize.width;
	ws.height = this->m_wndSize.height;
}
void CWndPos::getSysRes(SWndSize& ws)
{
	ws.width = this->m_sysSize.width;
	ws.height = this->m_sysSize.height;
}
void CWndPos::getPosCenterBoth(SWndPos& wp)
{
	this->m_pos.pos_x = (this->m_sysSize.width - this->m_wndSize.width) / 2;
	this->m_pos.pos_y = (this->m_sysSize.height - this->m_wndSize.height) / 2;
	wp.pos_x = this->m_pos.pos_x;
	wp.pos_y = this->m_pos.pos_y;
}
void CWndPos::getPosCenterTop(SWndPos& wp)
{
	this->m_pos.pos_x = (this->m_sysSize.width - this->m_wndSize.width) / 2;
	wp.pos_x = this->m_pos.pos_x;
	wp.pos_y = 0;
}
void CWndPos::getPosCenterBottom(SWndPos& wp)
{
	this->m_pos.pos_x = (this->m_sysSize.width - this->m_wndSize.width) / 2;
	this->m_pos.pos_y = this->m_sysSize.height - this->m_wndSize.height;
	wp.pos_x = this->m_pos.pos_x;
	wp.pos_y = this->m_pos.pos_y;
}
void CWndPos::getPosRightTop(SWndPos& wp)
{
	this->m_pos.pos_x = this->m_sysSize.width - this->m_wndSize.width;
	wp.pos_x = this->m_pos.pos_x;
	wp.pos_y = 0;
}
void CWndPos::getPosRightCenter(SWndPos& wp)
{
	this->m_pos.pos_x = this->m_sysSize.width - this->m_wndSize.width;
	this->m_pos.pos_y = (this->m_sysSize.height - this->m_wndSize.height) / 2;
	wp.pos_x = this->m_pos.pos_x;
	wp.pos_y = this->m_pos.pos_y;
}
void CWndPos::getPosRightBottom(SWndPos& wp)
{
	this->m_pos.pos_x = this->m_sysSize.width - this->m_wndSize.width;
	this->m_pos.pos_y = this->m_sysSize.height - this->m_wndSize.height;
	wp.pos_x = this->m_pos.pos_x;
	wp.pos_y = this->m_pos.pos_y;
}
void CWndPos::getPosLeftTop(SWndPos& wp)
{
	wp.pos_x = 0;
	wp.pos_y = 0;
}
void CWndPos::getPosLeftCenter(SWndPos& wp)
{
	this->m_pos.pos_y = (this->m_sysSize.height - this->m_wndSize.height) / 2;
	wp.pos_x = 0;
	wp.pos_y = this->m_pos.pos_y;
}
void CWndPos::getPosLeftBottom(SWndPos& wp)
{
	this->m_pos.pos_y = this->m_sysSize.height - this->m_wndSize.height;
	wp.pos_x = 0;
	wp.pos_y = this->m_pos.pos_y;
}

WindowPosition.h

#ifndef _WINDOWPOSITION_H_
#define _WINDOWPOSITION_H_
//
#include <Windows.h>
//
// initialize struct
#define InitStruct(s, t) memset((void*) s, 0x0, sizeof(t))
//
// copy struct
#define CopyStruct(s_dst, s_src, t) memcpy((void*) s_dst, (void*) s_src, sizeof(t))
//
// Window(or Dialog box) position APIs:
// 1. SetWindowPos(HWND hWnd, HWND hWndInsertAfter, int X, int Y, int cx, int cy, UINT uFlags)
// 2. CreateWindow(LPCTSTR lpClassName, LPCTSTR lpWindowName, DWORD dwStyle, int x, int y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance LPVOID lpParam)
//
// struct position
typedef struct
{
	int pos_x;
	int pos_y;
}SWndPos;
//
// struct window size
typedef struct
{
	int width;
	int height;
}SWndSize;
//
// class window position
class CWndPos
{
public:
	CWndPos();
	CWndPos(__in HWND hWnd);
	CWndPos(__in const SWndSize& ws);
	CWndPos(__in const CWndPos& wndpos);
	CWndPos& operator=(__in const CWndPos& wndpos);
	~CWndPos();
	//
	// set window size
	void setWndSize(__in const SWndSize& ws);
	//
	// set Default window size(or get dialog box size from RC file)
	void setDefWndSize(__in HWND hWnd);
	//
	// get window size (or default size)
	void getWndSize(__out SWndSize& ws);
	//
	// get system resolution
	void getSysRes(__out SWndSize& ws);
	//
	// get Center position both(horizontal and vertical)
	void getPosCenterBoth(__out SWndPos& wp);
	//
	void getPosCenterTop(__out SWndPos& wp);
	void getPosCenterBottom(__out SWndPos& wp);
	//
	void getPosRightTop(__out SWndPos& wp);
	void getPosRightCenter(__out SWndPos& wp);
	void getPosRightBottom(__out SWndPos& wp);
	void getPosLeftTop(__out SWndPos& wp);
	void getPosLeftCenter(__out SWndPos& wp);
	void getPosLeftBottom(__out SWndPos& wp);
private:
	//
	// new position of the window
	SWndPos m_pos;
	//
	// system resolution
	SWndSize m_sysSize;
	//
	// window size
	SWndSize m_wndSize;
};
//
#endif