wtl界面3

不念不忘少年蓝@ 2022-10-08 05:43 107阅读 0赞

`WM_CONTEXTMENU`处理右键环境菜单.  
命令栏`CCommandBarCtrl`控件,有`TrackPopupMenu`方法,与`win32`的`TrackPopupMenuEx`一样.

BOOL CCommandBarCtrlImpl::TrackPopupMenu(HMENU hMenu, UINT uFlags, int x, int y,LPTPMPARAMS lpParams = NULL)

使用前,加载菜单资源.有`CMenu和CMenuHandle`两个类.

LRESULT CMainFrame::OnContextMenu(UINT, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    { 
        if((HWND)wParam == m_view)
        { 
            CMenu menu;//菜单.
            menu.LoadMenu(IDR_CONTEXTMENU);
            CMenuHandle menuPopup = menu.GetSubMenu(POPUP_MENU_POSITION);
            m_CmdBar.TrackPopupMenu(menuPopup, TPM_RIGHTBUTTON | TPM_VERPOSANIMATION | TPM_VERTICAL,GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));//命令栏的
        }
        else
            bHandled = FALSE;
        return 0;
    }

自己绘制窗口内容,需要写代码来支持滚动,  
两个滚动类:`CScrollImpl和CScrollWindowImpl`.从`CScrollImpl`继承,你可加`窗口类`并链入`消息映射`.`CScrollWindowImpl`从`CScrollImpl和CWindowImpl`继承,提供全部滚动窗口实现.`CMapScrollImpl和CMapScrollWindowImpl`还提供`映射`模式.为`全屏`加了消息映射.`映射模式`主要方便整合`坐标系`与最佳内容单元.  
实现滚动基两样:`置内容大小,绘画`.但你不必处理`WM_PAINT`及`相对当前滚动位置画哪部分`.而是`SetScrollSize`并实现`DoPaint`.由任意带`CScrollImpl`重载的`SetScrollSize`置大小.

void SetScrollSize(int xMin, int yMin, int xMax, int yMax, BOOL bRedraw = TRUE);
    void SetScrollSize(RECT& rcScroll, BOOL bRedraw = TRUE);
    void SetScrollSize(int cx, int cy, BOOL bRedraw = TRUE);
    void SetScrollSize(SIZE size, BOOL bRedraw = NULL);

改变内容大小时,调用`SetScrollSize`.

class CBitmapView : public CScrollWindowImpl<CBitmapView>
    { 
    ...
        void SetBitmap(HBITMAP hBitmap)
        { 
            if(!m_bmp.IsNull())
            m_bmp.DeleteObject();
            m_bmp = hBitmap;
            if(!m_bmp.IsNull())
                m_bmp.GetSize(m_size);
            else
                m_size.cx = m_size.cy = 1;
                SetScrollOffset(0, 0, FALSE);
                SetScrollSize(m_size);
        }
        ...
    };

绘制时,`CScrollWindowImpl`处理了`WM_PAINT`消息,并转向子类`DoPaint`函数.用适当`Win32视口`干`DoPaint`,允许你`在当前滚动位置绘制你的内容`.

LRESULT CScrollImpl::OnPaint(UINT, WPARAM wParam, LPARAM, BOOL&)
    { 
        T* pT = static_cast<T*>(this);
        ATLASSERT(::IsWindow(pT->m_hWnd));
        if(wParam != NULL)
        {  // HDC是这时传入的
            CDCHandle dc = (HDC)wParam;
            dc.SetViewportOrg(-m_ptOffset.x, -m_ptOffset.y);
            pT->DoPaint(dc);//T类型.
        }
        else
        { 
            CPaintDC dc(pT->m_hWnd);
            dc.SetViewportOrg(-m_ptOffset.x, -m_ptOffset.y);//原视口.
            pT->DoPaint(CDCHandle(dc));
        }
        return 0;
    }

子类:

class CBitmapView : public CScrollWindowImpl<CBitmapView>
    { 
    ...
        void DoPaint(CDCHandle dc)
        { 
            if(!m_bmp.IsNull())
            { 
            CDC dcMem;
            dcMem.CreateCompatibleDC(dc);
            HBITMAP hBmpOld = dcMem.SelectBitmap(m_bmp);
            dc.BitBlt(0, 0, m_size.cx, m_size.cy, dcMem, 0, 0, SRCCOPY);
            dcMem.SelectBitmap(hBmpOld);
            }
        }
        ...
    };
    //这是视图窗口

用缺省值填充结构,不关心是通过结构参数还是直接访问.最后`DoModal`生成对话框.  
所有通用对话框类允许你从他们简单派生类,并实现`消息映射,重载函数,或定制对话框的行为`.

LRESULT CMainFrame::OnFileOpen(WORD, WORD, HWND, BOOL&)
    { 
        // 传入TRUE 作为特定参数来指示这是文件打开对话框,而文件保存对话框
        CFileDialog dlg(TRUE, _T("bmp"), NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
        _T("Bitmap Files (*.bmp)\0*.bmp\0All Files (*.*)\0*.*\0"), m_hWnd);//从指定类型.
        // 所有模式通用对话框封装类都有DoModal方法
        if(dlg.DoModal() == IDOK)
        { 
            HBITMAP hBmp = (HBITMAP)::LoadImage(NULL, dlg.m_szFileName, IMAGE_BITMAP, 0, 0,
            LR_DEFAULTCOLOR | LR_LOADFROMFILE);
            m_view.SetBitmap(hBmp);//加载位图
        }
        return 0;
    }
    //封装列表框
    class CListBox : CWindow
    { 
    public:
        void ResetContent()
        { 
            ::SendMessage(m_hWnd, LB_RESETCONTENT, 0, 0L);
        }
        int InsertString(int nIndex, LPCTSTR lpszItem)
        { 
            return (int)::SendMessage(m_hWnd, LB_INSERTSTRING, nIndex, (LPARAM)lpszItem);
        }
        int SetCurSel(int nSelect)
        { 
            return (int)::SendMessage(m_hWnd, LB_SETCURSEL, nSelect, 0L);
        }
        int SetTopIndex(int nIndex)
        { 
            return (int)::SendMessage(m_hWnd, LB_SETTOPINDEX, nIndex, 0L);
        }
        ...
    };
    //构建
    BOOL CMainFrame::BuildList(HWND hwndLB, CRecentDocumentList& mru)
    { 
        CListBox lb(hwndLB);
        lb.ResetContent();
        int nSize = mru.m_arrDocs.GetSize();
        for(int i = 0; i < nSize; i++)
            lb.InsertString(-1, mru.m_arrDocs[i].szDocName);//列表框
        if(nSize > 0)
        { 
            lb.SetCurSel(0);
            lb.SetTopIndex(0);//置索引
        }
        return TRUE;
    }

选中时,发送`WM_COMMAND`消息.

template <class T, class TBase = CWindow, class TWinTraits = CControlWinTraits>
    class ATL_NO_VTABLE CWindowImpl : public CWindowImplBaseT< TBase, TWinTraits > { ...};
    //实现

`TBase`可从`无为的CWindow`类改为任意我们喜欢的类.`C++继承`也能有效`父类化win32`,允许我们在`列表框`处理前`处理/替换`列表框类消息.

class CMruList : public CWindowImpl<CMruList, CListBox>//这里继承mru与列表框.
    { //CWindow基类不做任何事
    public:
        SIZE m_size;
        CMruList(){ 
            m_size.cx = 200;
            m_size.cy = 150;
        }
        HWND Create(HWND hWndParent)
        { 
            CWindowImpl<CMruList, CListBox>::Create(hWndParent, rcDefault, NULL,WS_POPUP | WS_THICKFRAME | WS_CLIPCHILDREN | WS_CLIPSIBLINGS |WS_VSCROLL | LBS_NOINTEGRALHEIGHT, WS_EX_CLIENTEDGE);
            if(IsWindow())
                SetFont(AtlGetStockFont(DEFAULT_GUI_FONT));
            return m_hWnd;
        }
        BOOL BuildList(CRecentDocumentList& mru)
        { 
            ATLASSERT(IsWindow());
            ResetContent();
            int nSize = mru.m_arrDocs.GetSize();
            for(int i = 0; i < nSize; i++)
                InsertString(0, mru.m_arrDocs[i].szDocName); // 文档名以相反的顺序存放在数组中
            if(nSize > 0)
            { 
                SetCurSel(0);
                SetTopIndex(0);
            }
            return TRUE;
        }
        BOOL ShowList(int x, int y)
        { 
            return SetWindowPos(NULL, x, y, m_size.cx, m_size.cy, SWP_NOZORDER | SWP_SHOWWINDOW);
        }
        void HideList()
        { 
            RECT rect;
            GetWindowRect(&rect);
            m_size.cx = rect.right - rect.left;
            m_size.cy = rect.bottom - rect.top;
            ShowWindow(SW_HIDE);
        }
        void FireCommand()
        { 
            int nSel = GetCurSel();
            if(nSel != LB_ERR)
            { 
                ::SetFocus(GetParent()); // 将隐藏该窗口
                ::SendMessage(GetParent(), WM_COMMAND,
                MAKEWPARAM((WORD)(ID_FILE_MRU_FIRST + nSel), LBN_DBLCLK), (LPARAM)m_hWnd);
            }
        }
        BEGIN_MSG_MAP(CMruList)
            MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown)
            MESSAGE_HANDLER(WM_LBUTTONDBLCLK, OnLButtonDblClk)
            MESSAGE_HANDLER(WM_KILLFOCUS, OnKillFocus)
            MESSAGE_HANDLER(WM_NCHITTEST, OnNcHitTest)
        END_MSG_MAP()
        LRESULT OnKeyDown(UINT, WPARAM wParam, LPARAM, BOOL& bHandled)
        { 
            if(wParam == VK_RETURN)
                FireCommand();
            else
                bHandled = FALSE;
            return 0;
        }
        LRESULT OnLButtonDblClk(UINT, WPARAM, LPARAM, BOOL&)
        { 
            FireCommand();
            return 0;
        }
        LRESULT OnKillFocus(UINT, WPARAM, LPARAM, BOOL&)
        { 
            HideList();
            return 0;
        }
        LRESULT OnNcHitTest(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL&)
        { 
            LRESULT lRet = DefWindowProc(uMsg, wParam, lParam);
            switch(lRet)
            { 
                case HTLEFT:
                case HTTOP:
                case HTTOPLEFT:
                case HTTOPRIGHT:
                case HTBOTTOMLEFT:
                lRet = HTCLIENT; //这里不允许重新调整大小
                break;
                default:
                break;
            }
            return lRet;
        }
    };

`wtl`支持`打印`是`CPrintJob`的`StartPrintJob`方法.必须传递支持实现打印每一页的`IPrintJobInfo`接口对象.

// CPrintJob 使用的缺省回调
    // 这不是一个COM接口
    class ATL_NO_VTABLE IPrintJobInfo
    { 
    public:
    virtual void BeginPrintJob(HDC hDC)=0;
    virtual void EndPrintJob(HDC hDC, bool bAborted)=0;
    virtual void PrePrintPage(UINT nPage, HDC hDC)=0;
    virtual bool PrintPage(UINT nPage, HDC hDC)=0;
    virtual void PostPrintPage(UINT nPage, HDC hDC)=0;
    virtual DEVMODE* GetNewDevModeForPage(UINT nLastPage, UINT nPage)=0;
    virtual bool IsValidPage(UINT nPage);
    };

`CPrintJobInfo`重载了除`PrintPage`外方法,你必须实现它.重载其他方法,来定制.然后调用重载的`CPrintJobInfo`方法来打印.  
如框架:

class CMainFrame : ..., public CPrintJobInfo
    { 
    ...
        CPrinter m_printer;
        CDevMode m_devmode;
        RECT m_rcMargin;
    };
    //两个回调
    bool CMainFrame::IsValidPage(UINT nPage)
    { 
        return (nPage == 0); // 我们只有一页
    }
    bool CMainFrame::PrintPage(UINT nPage, HDC hDC)
    { 
        if (nPage >= 1)
        return false; // 我们只有一页
        ATLASSERT(!m_view.m_bmp.IsNull());
        ...
        // 打印
        dc.StretchBlt(xOff, yOff, cxBlt, cyBlt, dcMem, 0, 0, cx, cy, SRCCOPY);
        return true;
    }

`IsValidPage`是否有效,`PrintPage`实际打印,`拉伸位图`,最好允许用户`指定打印机/页面布局`,`CPrintDialog和CPageSetup`,先构造,再调用`DoModal`见前面.`CPrintPreview`基类,提供`SetPrintPreviewInfo`方法.  
`CPrintPreview`为打印预览基类.其创建增强型`元文件`.窗口中调用`DoPaint`来显示.  
`CPrintPreviewWindow`为完整实现.

LRESULT CMainFrame::OnFilePrintPreview(WORD, WORD, HWND, BOOL&)
    { 
        TogglePrintPreview();
        return 0;
    }
    void CMainFrame::TogglePrintPreview()
    { 
        if(m_bPrintPreview) // 关闭打印预览窗口
        { 
            ATLASSERT(m_hWndClient == m_wndPreview.m_hWnd);//切换视图就完了.
            m_hWndClient = m_view;
            m_view.ShowWindow(SW_SHOW);
            m_wndPreview.DestroyWindow();//消灭
        }
        else // 显示打印预览窗口
        { 
            ATLASSERT(m_hWndClient == m_view.m_hWnd);
            m_wndPreview.SetPrintPreviewInfo(m_printer, m_devmode.m_pDevMode,this, 0, 0);
            m_wndPreview.SetPage(0);//设置
            m_wndPreview.Create(m_hWnd, rcDefault, NULL, 0, WS_EX_CLIENTEDGE);//创建
            m_view.ShowWindow(SW_HIDE);//显示
            m_hWndClient = m_wndPreview;//客户区
        }//一个时候只一个客户区
        m_bPrintPreview = !m_bPrintPreview;
        UpdateLayout();
    }

`CPrintJob`类允许`不同线程后台打印`,处理`打印中取消`.属性页

class CPageOne : public CPropertyPageImpl<CPageOne>
    { 
    public:
        enum {  IDD = IDD_PROP_PAGE1 }; // 要求的,跟CDialogImpl一样
        LPCTSTR m_lpstrFilePath;
        CFileName m_filename;
        CPageOne() : m_lpstrFilePath(NULL) {  }
        BEGIN_MSG_MAP(CPageOne)
            MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
            CHAIN_MSG_MAP(CPropertyPageImpl<CPageOne>)
        END_MSG_MAP()
        LRESULT OnInitDialog(UINT, WPARAM, LPARAM, BOOL&);
    };
    class CPageTwo : public CPropertyPageImpl<CPageTwo>
    { 
    public:
        enum {  IDD = IDD_PROP_PAGE2 };
        LPCTSTR m_lpstrFilePath;
        CBitmapHandle m_bmp;
        CPageTwo() : m_lpstrFilePath(NULL){  }
        BEGIN_MSG_MAP(CPageTwo)
            MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
            CHAIN_MSG_MAP(CPropertyPageImpl<CPageTwo>)
        END_MSG_MAP()
        LRESULT OnInitDialog(UINT, WPARAM, LPARAM, BOOL&);
    };
    class CPageThree : public CPropertyPageImpl<CPageThree>
    { 
    public:
        enum {  IDD = IDD_PROP_PAGE3 };
        BEGIN_MSG_MAP(CPageThree)
            MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
            CHAIN_MSG_MAP(CPropertyPageImpl<CPageThree>)
        END_MSG_MAP()
        LRESULT OnInitDialog(UINT, WPARAM, LPARAM, BOOL&);
    };
    class CBmpProperties : public CPropertySheetImpl<CBmpProperties>
    { 
    public:
        CPageOne m_page1;
        CPageTwo m_page2;
        CPageThree m_page3;
        CBmpProperties()
        { 
            m_psh.dwFlags |= PSH_NOAPPLYNOW;//关闭应用,在此操作属性表标记
            AddPage(m_page1);
            AddPage(m_page2);
            AddPage(m_page3);//加至页列表
            SetActivePage(1);//首页
            SetTitle(_T("位图属性"));//属性表标题
        }
        void SetFileInfo(LPCTSTR lpstrFilePath, HBITMAP hBitmap);
        BEGIN_MSG_MAP(CBmpProperties)
            CHAIN_MSG_MAP(CPropertySheetImpl<CBmpProperties>)//基类
        END_MSG_MAP()
    };
    LRESULT CMainFrame::OnViewProperties(WORD, WORD, HWND, BOOL&)
    { 
        CBmpProperties prop;
        if(lstrlen(m_szFilePath) > 0) // 我们有一个文件名
            prop.SetFileInfo(m_szFilePath, NULL);
        else // 然后必须是剪切板
            prop.SetFileInfo(NULL, m_view.m_bmp.m_hBitmap);
        prop.DoModal();//查看属性表时.
        return 0;
    }

显示位图,好界面,更新界面.消息过滤,是像流水线一个挨个处理.

int Run(LPTSTR = NULL, int nCmdShow = SW_SHOWDEFAULT)
    { 
        CMessageLoop theLoop;
        _Module.AddMessageLoop(&theLoop);//主模块
        CMainFrame wndMain;
        if(wndMain.CreateEx() == NULL)
            return 0;
        wndMain.ShowWindow(nCmdShow);
        int nRet = theLoop.Run();//跑
        _Module.RemoveMessageLoop();
        return nRet;
    }//消息循环
    int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE, LPTSTR lpstrCmdLine, int nCmdShow)
    { //主程序
        INITCOMMONCONTROLSEX iccx;
        iccx.dwSize = sizeof(iccx);
        iccx.dwICC = ICC_COOL_CLASSES | ICC_BAR_CLASSES;
        BOOL bRet = ::InitCommonControlsEx(&iccx);
        bRet;//常见控件
        ATLASSERT(bRet);
        HRESULT hRes = _Module.Init(NULL, hInstance);
        hRes;
        ATLASSERT(SUCCEEDED(hRes));
        int nRet = Run(lpstrCmdLine, nCmdShow);
        _Module.Term();
        return nRet;
    }

主应用:

class CAppModule : public CComModule
    { 
    public:
        DWORD m_dwMainThreadID;
        CSimpleMap<DWORD, CMessageLoop*>* m_pMsgLoopMap;//消息循环.
        CSimpleArray<HWND>* m_pSettingChangeNotify;//设置通知
        // 重载CComModule::Init 和Term
        HRESULT Init(_ATL_OBJMAP_ENTRY* pObjMap, HINSTANCE hInstance, const GUID* pLibID = NULL);
        void Term();
        // 消息循环映射方法
        BOOL AddMessageLoop(CMessageLoop* pMsgLoop);
        BOOL RemoveMessageLoop();
        CMessageLoop* GetMessageLoop(DWORD dwThreadID) const;
        // 设置改变通知方法
        BOOL AddSettingChangeNotify(HWND hWnd);
        BOOL RemoveSettingChangeNotify(HWND hWnd);
    //加设置改变/删设置改变通知
        ...
    };

消息循环的`跑`

int CMessageLoop::Run()
    { 
        BOOL bDoIdle = TRUE;
        int nIdleCount = 0;
        BOOL bRet;
        for(;;)
        { 
            while(!::PeekMessage(&m_msg, NULL, 0, 0, PM_NOREMOVE) && bDoIdle)
            { 
                if(!OnIdle(nIdleCount++))
                bDoIdle = FALSE;
            }
            bRet = ::GetMessage(&m_msg, NULL, 0, 0);
            if(bRet == -1)
                continue; // error, don't process
            else if(!bRet)break; // WM_QUIT,退出
            if(!PreTranslateMessage(&m_msg))
            { //遍历登记在本线程CMessageFilter类的实现列表
                ::TranslateMessage(&m_msg);
                ::DispatchMessage(&m_msg);
            }//分发
            if(IsIdleMessage(&m_msg))
            { 
                bDoIdle = TRUE;
                nIdleCount = 0;
            }
        }
        return (int)m_msg.wParam;
    }//消息循环

`CMessageFilter`接口:

class CMessageFilter
    { 
    public:
        virtual BOOL PreTranslateMessage(MSG* pMsg) = 0;
    };

向导生成:

class CMainFrame : ..., public CMessageFilter
    { 
    ...
        virtual BOOL PreTranslateMessage(MSG* pMsg)
        { 
            if(CFrameWindowImpl<CMainFrame>::PreTranslateMessage(pMsg))return TRUE;
            return m_view.PreTranslateMessage(pMsg);
        }//先基类处理,再本视图处理.
    };

空闲处理器:

class CIdleHandler
    { 
        public:
        virtual BOOL OnIdle() = 0;
    };
    BOOL CMessageLoop::AddIdleHandler(CIdleHandler* pIdleHandler)
    { 
        return m_aIdleHandler.Add(pIdleHandler);
    }
    BOOL CMessageLoop::RemoveIdleHandler(CIdleHandler* pIdleHandler)
    { 
        return m_aIdleHandler.Remove(pIdleHandler);
    }

更新界面:

class CMainFrame : ..., public CUpdateUI<CMainFrame>
    { 
    ...
    BEGIN_UPDATE_UI_MAP(CMainFrame)
        UPDATE_ELEMENT(ID_FILE_PRINT, UPDUI_MENUPOPUP | UPDUI_TOOLBAR)
        UPDATE_ELEMENT(ID_FILE_PRINT_PREVIEW, UPDUI_MENUPOPUP | UPDUI_TOOLBAR)
        UPDATE_ELEMENT(ID_EDIT_COPY, UPDUI_MENUPOPUP | UPDUI_TOOLBAR)
        UPDATE_ELEMENT(ID_EDIT_PASTE, UPDUI_MENUPOPUP | UPDUI_TOOLBAR)
        UPDATE_ELEMENT(ID_EDIT_CLEAR, UPDUI_MENUPOPUP | UPDUI_TOOLBAR)
        UPDATE_ELEMENT(ID_VIEW_TOOLBAR, UPDUI_MENUPOPUP)
        UPDATE_ELEMENT(ID_VIEW_STATUS_BAR, UPDUI_MENUPOPUP)
        UPDATE_ELEMENT(ID_VIEW_PROPERTIES, UPDUI_MENUPOPUP | UPDUI_TOOLBAR)
        UPDATE_ELEMENT(ID_RECENT_BTN, UPDUI_TOOLBAR)
    END_UPDATE_UI_MAP()
    };