DirectUI界面编程（五）WindowImplBase的使用

痛定思痛。 2022-08-02 15:54 154阅读 0赞

上节笔者向大家介绍了Duilib的界面布局并在最后编写了一个仿QQ旋风的界面，但是由于我们屏蔽了系统的标题栏，读者可能已经发现，我们的窗口没办法移动，同样也不能通过拖动来改变窗口的大小。

这就需要我们对WM\_NCHITTEST消息进行处理，该消息的LPARAM参数存放鼠标的x坐标和y坐标，在程序中需要对x/y坐标位置进行判断，当坐标落在下图红色线框位置时，我们向窗口过程函数返回HTCAPTION，这样操作系统就会把红色线框区域当成系统的标题栏。  
![这里写图片描述][20150726212047347]

我们可以使用类似的方法告诉Windows操作系统哪里是窗口的右下角，哪里是窗口的边框等等，关于这个消息的更多介绍读者可以参考MSDN。对该消息进行处理算是比较麻烦的，而且对于初学者来说不太好理解，幸运的是Duilib官方为我们封装好了一个WindowImplBase类，该类已经对一些Window消息进行了处理，我们只需要继承这个类就可以了。

笔者对该类稍微进行了修改，类的声明写在win\_impl\_base.hpp文件中：

#ifndef WIN_IMPL_BASE_HPP
    #define WIN_IMPL_BASE_HPP
    #include "../DuiLib/StdAfx.h" 
    #include <Windows.h>
    #include <string>
    typedef std::basic_string<TCHAR> tString;
    
    using namespace DuiLib;
    
    namespace DuiLib {
     class CWindowWnd; class INotifyUI; class IMessageFilterUI; class IDialogBuilderCallback; } class WindowImplBase : public CWindowWnd, public INotifyUI, public IMessageFilterUI, public IDialogBuilderCallback { public: WindowImplBase(); virtual ~WindowImplBase(); virtual void OnFinalMessage(HWND hWnd); virtual UINT GetClassStyle() const; virtual void Init(); virtual CControlUI* CreateControl(LPCTSTR pstrClass); virtual LRESULT MessageHandler(UINT uMsg, WPARAM wParam, LPARAM lParam, bool& bHandled); virtual LRESULT OnClose(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnDestroy(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); #if defined(WIN32) && !defined(UNDER_CE) virtual LRESULT OnNcActivate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnNcCalcSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnNcPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnNcHitTest(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnGetMinMaxInfo(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnMouseWheel(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); #endif virtual LRESULT OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnSysCommand(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnKeyDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnKillFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnSetFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnLButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnLButtonUp(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); virtual LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam); virtual LRESULT HandleCustomMessage(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled); protected: virtual tString GetSkinFolder(); virtual tString GetSkinFile() = 0; virtual LRESULT ResponseDefaultKeyEvent(WPARAM wParam); protected: CPaintManagerUI paint_manager_; }; #endif // WIN_IMPL_BASE_HPP

下面是一些成员函数的实现部分，写在win\_impl\_base.cpp文件中：

#include "win_impl_base.hpp"
    
    WindowImplBase::WindowImplBase()
    {}
    
    WindowImplBase::~WindowImplBase()
    {}
    
    UINT WindowImplBase::GetClassStyle() const
    {
        return CS_DBLCLKS;
    }
    
    CControlUI* WindowImplBase::CreateControl(LPCTSTR pstrClass)
    {
        return NULL;
    }
    
    void WindowImplBase::OnFinalMessage(HWND /*hWnd*/)
    {
        paint_manager_.RemovePreMessageFilter(this);
        paint_manager_.RemoveNotifier(this);
        paint_manager_.ReapObjects(paint_manager_.GetRoot());
    }
    
    void WindowImplBase::Init()
    {}
    
    LRESULT WindowImplBase::OnClose(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnDestroy(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    #if defined(WIN32) && !defined(UNDER_CE)
    LRESULT WindowImplBase::OnNcActivate(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& bHandled)
    {
        if( ::IsIconic(*this) ) bHandled = FALSE;
        return (wParam == 0) ? TRUE : FALSE;
    }
    
    LRESULT WindowImplBase::OnNcCalcSize(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        return 0;
    }
    
    LRESULT WindowImplBase::OnNcPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        return 0;
    }
    
    LRESULT WindowImplBase::OnNcHitTest(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        POINT pt; pt.x = GET_X_LPARAM(lParam); pt.y = GET_Y_LPARAM(lParam);
        ::ScreenToClient(*this, &pt);
    
        RECT rcClient;
        ::GetClientRect(*this, &rcClient);
    
        if( !::IsZoomed(*this) ) {
            RECT rcSizeBox = paint_manager_.GetSizeBox();
            if( pt.y < rcClient.top + rcSizeBox.top ) {
                if( pt.x < rcClient.left + rcSizeBox.left ) return HTTOPLEFT;
                if( pt.x > rcClient.right - rcSizeBox.right ) return HTTOPRIGHT;
                return HTTOP;
            }
            else if( pt.y > rcClient.bottom - rcSizeBox.bottom ) {
                if( pt.x < rcClient.left + rcSizeBox.left ) return HTBOTTOMLEFT;
                if( pt.x > rcClient.right - rcSizeBox.right ) return HTBOTTOMRIGHT;
                return HTBOTTOM;
            }
            if( pt.x < rcClient.left + rcSizeBox.left ) return HTLEFT;
            if( pt.x > rcClient.right - rcSizeBox.right ) return HTRIGHT;
        }
    
        RECT rcCaption = paint_manager_.GetCaptionRect();
        if( pt.x >= rcClient.left + rcCaption.left && pt.x < rcClient.right - rcCaption.right \
            && pt.y >= rcCaption.top && pt.y < rcCaption.bottom ) {
                CControlUI* pControl = static_cast<CControlUI*>(paint_manager_.FindControl(pt));
                if( pControl && _tcsicmp(pControl->GetClass(), _T("ButtonUI")) != 0 && 
                    _tcsicmp(pControl->GetClass(), _T("OptionUI")) != 0 /*&& _tcsicmp(pControl->GetClass(), _T("TextUI")) != 0 */)
                    return HTCAPTION;
        }
    
        return HTCLIENT;
    }
    
    LRESULT WindowImplBase::OnGetMinMaxInfo(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        MONITORINFO oMonitor = {};
        oMonitor.cbSize = sizeof(oMonitor);
        ::GetMonitorInfo(::MonitorFromWindow(*this, MONITOR_DEFAULTTOPRIMARY), &oMonitor);
        CRect rcWork = oMonitor.rcWork;
        rcWork.Offset(-rcWork.left, -rcWork.top);
    
        LPMINMAXINFO lpMMI = (LPMINMAXINFO) lParam;
        lpMMI->ptMaxPosition.x  = rcWork.left;
        lpMMI->ptMaxPosition.y  = rcWork.top;
        lpMMI->ptMaxSize.x      = rcWork.right;
        lpMMI->ptMaxSize.y      = rcWork.bottom;
    
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnMouseWheel(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    #endif
    
    
    LRESULT WindowImplBase::OnSetFocus(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnLButtonDown(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnMouseMove(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnLButtonUp(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnKeyDown(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnKillFocus(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        SIZE szRoundCorner = paint_manager_.GetRoundCorner();
    #if defined(WIN32) && !defined(UNDER_CE)
        if( !::IsIconic(*this) && (szRoundCorner.cx != 0 || szRoundCorner.cy != 0) ) {
            CRect rcWnd;
            ::GetWindowRect(*this, &rcWnd);
            rcWnd.Offset(-rcWnd.left, -rcWnd.top);
            rcWnd.right++; rcWnd.bottom++;
            HRGN hRgn = ::CreateRoundRectRgn(rcWnd.left, rcWnd.top, rcWnd.right, rcWnd.bottom, szRoundCorner.cx, szRoundCorner.cy);
            ::SetWindowRgn(*this, hRgn, TRUE);
            ::DeleteObject(hRgn);
        }
    #endif
        bHandled = FALSE;
        return 0;
    }
    
    
    LRESULT WindowImplBase::OnSysCommand(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        if (wParam == SC_CLOSE){
            bHandled = TRUE;
            return 0;
        }
    #if defined(WIN32) && !defined(UNDER_CE)
        BOOL bZoomed = ::IsZoomed(*this);
        LRESULT lRes = CWindowWnd::HandleMessage(uMsg, wParam, lParam);
        if( ::IsZoomed(*this) != bZoomed ){
        }
    #else
        LRESULT lRes = CWindowWnd::HandleMessage(uMsg, wParam, lParam);
    #endif
        return lRes;
    }
    
    
    tString WindowImplBase::GetSkinFolder()
    {
        return tString(CPaintManagerUI::GetInstancePath()); //+ _T("skin\\");
    }
    
    LRESULT WindowImplBase::OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        LONG styleValue = ::GetWindowLong(*this, GWL_STYLE);
        styleValue &= ~WS_CAPTION;
        ::SetWindowLong(*this, GWL_STYLE, styleValue | WS_CLIPSIBLINGS | WS_CLIPCHILDREN);
        RECT rcClient;
        ::GetClientRect(*this, &rcClient);
        ::SetWindowPos(*this, NULL, rcClient.left, rcClient.top, rcClient.right - rcClient.left, \
            rcClient.bottom - rcClient.top, SWP_FRAMECHANGED);
    
        paint_manager_.Init(m_hWnd);
        paint_manager_.AddPreMessageFilter(this);
    
        CDialogBuilder builder; 
        //paint_manager_.SetResourcePath(GetSkinFolder().c_str()); 
        //tString tstrSkin = paint_manager_.GetResourcePath();
        tString tstrSkin = GetSkinFile(); 
        CControlUI* pRoot = builder.Create(tstrSkin.c_str(), (UINT)0, this, &paint_manager_);
        paint_manager_.AttachDialog(pRoot);
        paint_manager_.AddNotifier(this);
    
        Init();
        return 0;
    }
    
    LRESULT WindowImplBase::HandleCustomMessage(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        bHandled = FALSE;
        return 0;
    }
    
    LRESULT WindowImplBase::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
    {
        LRESULT lRes = 0;
        BOOL bHandled = TRUE;
        switch (uMsg)
        {
        case WM_CREATE:         lRes = OnCreate(uMsg, wParam, lParam, bHandled); break;
        case WM_CLOSE:          lRes = OnClose(uMsg, wParam, lParam, bHandled); break;
        case WM_DESTROY:        lRes = OnDestroy(uMsg, wParam, lParam, bHandled); break;
    #if defined(WIN32) && !defined(UNDER_CE)
        case WM_NCACTIVATE:     lRes = OnNcActivate(uMsg, wParam, lParam, bHandled); break;
        case WM_NCCALCSIZE:     lRes = OnNcCalcSize(uMsg, wParam, lParam, bHandled); break;
        case WM_NCPAINT:        lRes = OnNcPaint(uMsg, wParam, lParam, bHandled); break;
        case WM_NCHITTEST:      lRes = OnNcHitTest(uMsg, wParam, lParam, bHandled); break;
        case WM_GETMINMAXINFO:  lRes = OnGetMinMaxInfo(uMsg, wParam, lParam, bHandled); break;
        case WM_MOUSEWHEEL:     lRes = OnMouseWheel(uMsg, wParam, lParam, bHandled); break;
    #endif
        case WM_SIZE:           lRes = OnSize(uMsg, wParam, lParam, bHandled); break;   
        case WM_SYSCOMMAND:     lRes = OnSysCommand(uMsg, wParam, lParam, bHandled); break;
        case WM_KEYDOWN:        lRes = OnKeyDown(uMsg, wParam, lParam, bHandled); break;
        case WM_KILLFOCUS:      lRes = OnKillFocus(uMsg, wParam, lParam, bHandled); break;
        case WM_SETFOCUS:       lRes = OnSetFocus(uMsg, wParam, lParam, bHandled); break;
        case WM_LBUTTONUP:      lRes = OnLButtonUp(uMsg, wParam, lParam, bHandled); break;
        case WM_LBUTTONDOWN:    lRes = OnLButtonDown(uMsg, wParam, lParam, bHandled); break;
        case WM_MOUSEMOVE:      lRes = OnMouseMove(uMsg, wParam, lParam, bHandled); break;
        default:                bHandled = FALSE; break;
        }
        if (bHandled) return lRes;
    
        lRes = HandleCustomMessage(uMsg, wParam, lParam, bHandled);
        if (bHandled) return lRes;
    
        if (paint_manager_.MessageHandler(uMsg, wParam, lParam, lRes)) return lRes;
        return CWindowWnd::HandleMessage(uMsg, wParam, lParam);
    }
    
    LRESULT WindowImplBase::MessageHandler(UINT uMsg, WPARAM wParam, LPARAM /*lParam*/, bool& /*bHandled*/)
    {
        if (uMsg == WM_KEYDOWN)
        {
            switch (wParam)
            {
            case VK_RETURN:
            case VK_ESCAPE:
                return ResponseDefaultKeyEvent(wParam);
            default:
                break;
            }
        }
        return FALSE;
    }
    
    LRESULT WindowImplBase::ResponseDefaultKeyEvent(WPARAM wParam)
    {
        if (wParam == VK_RETURN)
        {
            return FALSE;
        }
        else if (wParam == VK_ESCAPE)
        {
            Close();
            return TRUE;
        }
    
        return FALSE;
    }

我们需要將这两个文件添加到自己的工程中，项目结构如下图所示：  
![这里写图片描述][20150726213258661]

在我们的程序中不再继承CWindowWnd和INotifyUI这两个类，而是直接继承WindowImplBase，重写父类的GetWindowClassName、GetClassStyle、GetSkinFile、Notify四个函数即可：

#include "win_impl_base.hpp"
    #include <Windows.h>
    class MyWnd : public WindowImplBase
    {
        LPCTSTR GetWindowClassName() const
        {
            return L"MyWnd";
        }
        UINT GetClassStyle() const{
            return UI_CLASSSTYLE_FRAME|CS_DBLCLKS;
        }
        tString GetSkinFile(){
            return L"tutorial5.xml";
        }
        void Notify(TNotifyUI& msg)
        {
            if(msg.sType == L"click")
            {
                if(msg.pSender->GetName() == L"CloseBtn")
                {
                    ::PostQuitMessage(0);
    
                }else if(msg.pSender->GetName() == L"MinBtn")
                {
                    ::SendMessage(m_hWnd,WM_SYSCOMMAND, SC_MINIMIZE, 0);
                }
            }
        } 
    
    
    };
    INT WinMain(HINSTANCE hInst,HINSTANCE hPreInst,LPSTR lpCmdLine,INT Show)
    {
        CPaintManagerUI::SetInstance(hInst);
        CPaintManagerUI::SetResourcePath(CPaintManagerUI::GetResourcePath());
        //创建主窗口
        MyWnd* pFrame = new MyWnd();
        pFrame->Create(NULL,L"Tutorial5",UI_WNDSTYLE_FRAME^WS_THICKFRAME,WS_EX_WINDOWEDGE);
        pFrame->CenterWindow(); 
        pFrame->ShowWindow(true);
        CPaintManagerUI::MessageLoop();
    
        return 0;
    }

我们只需要在GetSkinFile方法中返回一个界面布局文件名称，比上节简单多了吧，编译运行看到上节的界面能够成功加载而且已经可以拖动了。  
![这里写图片描述][20150726214936002]

博文源码：[https://github.com/rongbo-j/duilib-tutorial][https_github.com_rongbo-j_duilib-tutorial]

[20150726212047347]: /images/20220731/f9aba4d3ada44b5b9af18946b499ed15.png
[20150726213258661]: /images/20220731/d2fab7a637f74f70af521e09ff913490.png
[20150726214936002]: /images/20220731/e1048e52090746ab9c93c447e3816c18.png
[https_github.com_rongbo-j_duilib-tutorial]: https://github.com/rongbo-j/duilib-tutorial