// ChildFrm.cpp: CChildFrame 类的实现
//

#include "pch.h"
#include "framework.h"
#include "MFCApplication1.h"

#include "ChildFrm.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// CChildFrame

IMPLEMENT_DYNCREATE(CChildFrame, CMDIChildWnd)

BEGIN_MESSAGE_MAP(CChildFrame, CMDIChildWnd)
	ON_COMMAND(ID_FILE_CLOSE, &CChildFrame::OnFileClose)
	ON_WM_SETFOCUS()
	ON_WM_CREATE()
END_MESSAGE_MAP()

// CChildFrame 构造/析构

CChildFrame::CChildFrame() noexcept
{
	// TODO: 在此添加成员初始化代码
}

CChildFrame::~CChildFrame()
{
}


BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: 在此处通过修改 CREATESTRUCT cs 来修改窗口类或样式
	if( !CMDIChildWnd::PreCreateWindow(cs) )
		return FALSE;

	cs.dwExStyle &= ~WS_EX_CLIENTEDGE;
	cs.lpszClass = AfxRegisterWndClass(0);
	return TRUE;
}

// CChildFrame 诊断

#ifdef _DEBUG
void CChildFrame::AssertValid() const
{
	CMDIChildWnd::AssertValid();
}

void CChildFrame::Dump(CDumpContext& dc) const
{
	CMDIChildWnd::Dump(dc);
}
#endif //_DEBUG

// CChildFrame 消息处理程序
void CChildFrame::OnFileClose() 
{
	// 若要关闭框架，只需发送 WM_CLOSE，
	// 这相当于从系统菜单中选择关闭。
	SendMessage(WM_CLOSE);
}

int CChildFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CMDIChildWnd::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// 创建一个视图以占用框架的工作区
	if (!m_wndView.Create(nullptr, nullptr, AFX_WS_DEFAULT_VIEW, 
		CRect(0, 0, 0, 0), this, AFX_IDW_PANE_FIRST, nullptr))
	{
		TRACE0("未能创建视图窗口\n");
		return -1;
	}

	return 0;
}

void CChildFrame::OnSetFocus(CWnd* pOldWnd) 
{
	CMDIChildWnd::OnSetFocus(pOldWnd);

	m_wndView.SetFocus();
}

BOOL CChildFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo) 
{
	// 让视图第一次尝试该命令
	if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;
	
	// 否则，执行默认处理
	return CMDIChildWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}