MFC中对话框上控件随着界面变化而变化的实现

首先说明一下缩放实现步骤：先在OnInitDialog()中获取当前客户区的大小，然后调用WM_SIZE事件处理函数OnSize()，然后就是具体的实现过程，见下图代码实现。

1、先在头文件中添加以下代码：

protected:
	CRect m_rect;
	void ReSize(void);
	POINT old;

2、然后再OnInitDialog()中添加如下代码：

// TODO: 在此添加额外的初始化代码
	GetClientRect(&m_rect);
	old.x = m_rect.right - m_rect.left;
	old.y = m_rect.bottom - m_rect.top;

3、然后实现ReSize()函数，如下：

float fsp[2];
	POINT NewP;		//获取现在对话框的大小
	CRect new_rect;
	GetClientRect(&new_rect);
	NewP.x = new_rect.right - new_rect.left;
	NewP.y = new_rect.bottom - new_rect.top;

	fsp[0] = (float)NewP.x / old.x;
	fsp[1] = (float)NewP.y / old.y;

	CRect m_Rect;
	int woc;
	CPoint OldTLPoint, TLPoint;//左上角
	CPoint OldBRPoint, BRPoint;//右下角

	HWND hWndChild = ::GetWindow(m_hWnd, GW_CHILD);	//列出所有控件
	while(hWndChild)
	{
		woc = ::GetDlgCtrlID(hWndChild);	//取得ID
		GetDlgItem(woc)->GetWindowRect(m_Rect);
		ScreenToClient(m_Rect);

		OldTLPoint = m_Rect.TopLeft();
		TLPoint.x = (long)(OldTLPoint.x*fsp[0]);
		TLPoint.y = (long)(OldTLPoint.y*fsp[1]);

		OldBRPoint = m_Rect.BottomRight();
		BRPoint.x = (long)(OldBRPoint.x*fsp[0]);
		BRPoint.y = (long)(OldBRPoint.y*fsp[1]);

		m_Rect.SetRect(TLPoint, BRPoint);
		GetDlgItem(woc)->MoveWindow(m_Rect, TRUE);
		hWndChild = ::GetWindow(hWndChild, GW_HWNDNEXT);
	}
	old = NewP;

4、最后在事件函数中调用：

// TODO: 在此处添加消息处理程序代码
	if (nType != SIZE_MINIMIZED)	//判断窗口是不是最小化了，因为窗口最小化之后，窗口的长和宽会变为0，这样造成除以0的错误
	{
		ReSize();
	}