[WTL]Resize处理|

1. 实现自绘窗口的Resize

自绘的主窗口，往往没有WS_BORDER【特别是Win7下的Border，厚厚的~】，但是没有Border，就等于没有了WS_SIZEBOX。那么我们怎么样才能实现同等的功能呢?

接管以下三个消息：

MESSAGE_HANDLER(WM_NCHITTEST,     OnNcHitTest)
MESSAGE_HANDLER(WM_SETCURSOR,     OnSetCursor)
MESSAGE_HANDLER(WM_NCLBUTTONDOWN, OnNcLButtonDown)

第一个好说，到处都是MFC的例子，判断以下Border的位置，返回HTBOTTOMRIGHT 这些值即可。

Cursor这里，我直接给出WTL的代码好了，以后直接抄：

LRESULT OnSetCursor(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam, BOOL& /*bHandled*/)
{
        int nHitTest = LOWORD(lParam);
        if(nHitTest == HTCAPTION || nHitTest == HTSYSMENU ||
            nHitTest == HTMENU || nHitTest == HTCLIENT)
        {
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
        }
        else if(nHitTest == HTTOP || nHitTest == HTBOTTOM)
        {
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS)));
        }
        else if(nHitTest == HTLEFT || nHitTest == HTRIGHT)
        {
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZEWE)));
        }
        else if(nHitTest == HTTOPLEFT || nHitTest == HTBOTTOMRIGHT)
        {
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENWSE)));
        }
        else if(nHitTest == HTTOPRIGHT || nHitTest == HTBOTTOMLEFT)
        {
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENESW)));
        }
        else
        {
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
        }
        return S_OK;

} 

NCLBUTTONDOWN可以这么写：

    LRESULT OnNcLButtonDown(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam, BOOL& /*bHandled*/)
    {
        T* pT = static_cast<T*>(this);
        POINT point;
        point.x = HIWORD(lParam);
        point.y = LOWORD(lParam);
        int nHitTest = LOWORD(wParam);
        if(nHitTest == HTTOP)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOP, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTBOTTOM)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOM, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTLEFT)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_LEFT, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTRIGHT)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_RIGHT, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTTOPLEFT)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPLEFT, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTTOPRIGHT)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPRIGHT, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTBOTTOMLEFT)
            pT->SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMLEFT, MAKELPARAM(point.x, point.y));
        else if(nHitTest == HTBOTTOMRIGHT)
            pT->SendMessage(WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMRIGHT, MAKELPARAM(point.x, point.y));

        return 0;

    } 

 参考:

http://hi.baidu.com/bdxiong/blog/item/b7273b3031103294a9018e06.html