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積累的VC程式設計小技巧之工具條和狀态條

方法⑴.隻能在ToolBar裡建立控件:首先,在ToolBar中建立一個Button,其ID為ID_TOOL_COMBO(我們要将建立的控件放在該Button的位置上).

其次,新建立一個類CMainToolBar,要從CToolBar繼承(建立過程大概如下:選擇工程/增加到工程/新的類;也可以選擇工程的根,然後點選右鍵,選擇新的類;或者CTL+W,選擇增加類/新的類 --- 然後在class type裡選擇Generic Class,在Name欄裡輸入新類的名字,Base class裡輸入CToolBar[u1]),建立成功後在該類裡建立要增加的控件的對象,如:

CComboBox        m_wndMyCombo;

CStatic          m_wndCategory, m_wndCategoryPath;

CButton          m_wndOpenButton;

Cedit                  m_wndEdit;

然後在構造函數裡初始化如:

m_wndMyCombo.m_hWnd = NULL;

m_wndCategory.m_hWnd = NULL;

m_wndCategoryPath.m_hWnd = NULL;

m_wndOpenButton.m_hWnd = NULL;

m_wndEdit.m_hWnd = NULL;

接着在CMainframe的頭檔案裡建立CMainToolBar的一個對象m_wndToolBar,最後在.cpp檔案的OnCreate函數的最後實作如下:

       int index = 0;

       CRect rect;   // 可定義在頭檔案當中

       //  ComboBox

       {

              //找到指定的工具項

              while(m_wndToolBar.GetItemID(index)!=ID_TOOL_COMBO)

                     index++;

              //設定指定工具項的寬度并擷取新的區域  120是寬度

              m_wndToolBar.SetButtonInfo(index, ID_TOOL_COMBO, TBBS_SEPARATOR, 120);

              m_wndToolBar.GetItemRect(index, &rect);

              //設定位置

              rect.top+=1;

              rect.bottom += 200;

              // 建立并顯示控件

              if(!m_wndToolBar.m_wndMyCombo.Create(WS_CHILD|WS_VISIBLE| CBS_AUTOHSCROLL|

                     CBS_DROPDOWNLIST | CBS_HASSTRINGS , rect, &m_wndToolBar, ID_TOOL_COMBO))

              { 

                     TRACE0("Failed to create combo-box\n");

                     return FALSE;

              }

              m_wndToolBar.m_wndMyCombo.ShowWindow(SW_SHOW);

              //填充内容   

              m_wndToolBar.m_wndMyCombo.AddString("25%");

              m_wndToolBar.m_wndMyCombo.AddString("50%");

              m_wndToolBar.m_wndMyCombo.AddString("75%");

              //選擇預設項

              m_wndToolBar.m_wndMyCombo.SetCurSel(0);

              //擷取到内容并MSGBOX顯示出來

              CString strContent;

              m_wndToolBar.m_wndMyCombo.GetWindowText(strContent);

              index = 0;

       }

其他控件都類似建立(隻需要注意一下各自的Create函數的參數即可)。

方法⑵.這種方法建立不太容易控制:直接在CMainframe的頭檔案中建立要增加的控件的對象,如CButton      的對象m_wndAboutButton,然後建立CToolBar或者CstatusBar的對象,如:CstatusBar的對象_wndStatusBar;再增加幾個函數如下:

Protected:

virtual void RecalcLayout(BOOL bNotify = TRUE);

       afx_msg void CMainFrame::OnViewStatusBar();

接着在.cpp檔案中将StatusBar的ID和OnViewStatusBar 函數綁定在一起,如下所示:BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)

           //  {{AFX_MSG_MAP(CMainFrame)

           ON_COMMAND(ID_VIEW_STATUS_BAR, OnViewStatusBar)

        ON_WM_CREATE()

              //  }}AFX_MSG_MAP

              END_MESSAGE_MAP()

然後Create函數的最後(傳回值之前)實作如下代碼:

CRect rc;

       VERIFY(m_wndAboutButton.Create(_T("MyAbout"),

                 WS_VISIBLE,rc,this,ID_APP_ABOUT));

       // TODO: Remove this if you don't want tool tips or a resizeable toolbar

       m_wndToolBar.SetBarStyle(m_wndToolBar.GetBarStyle() |

       CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);

再在RecalcLayout函數裡實作:

if (m_wndStatusBar.m_hWnd)

{

              m_wndStatusBar.GetWindowRect(&rc);

              ScreenToClient(&rc);

              rc.right -= 50;

              m_wndStatusBar.SetWindowPos(NULL,rc.left,rc.top,rc.Width(),rc.Height(),

SWP_NOZORDER);

              rc.left = rc.right;

              rc.right += 50;

最後在OnViewStatusBar()裡實作:

BOOL bShow = m_wndStatusBar.GetStyle() & WS_VISIBLE;

m_wndAboutButton.SetWindowPos(NULL, 0, 0, 0, 0, SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|

(bShow ? SWP_SHOWWINDOW : SWP_HIDEWINDOW));

ToolBar中的建立與此相同,隻需更改一下句柄即可

bCheck=m_RtfEditToolBar.GetToolBarCtrl().IsButtonChecked(ID_TB_BOLD);

m_RtfEditToolBar.GetToolBarCtrl().CheckButton(ID_TB_BOLD, !bCheck);

添加如下兩個函數

隐藏:

void CMainFrame::OnHide() 

    if(m_wndToolBar.IsWindowVisible())

        m_wndToolBar.ModifyStyle(WS_VISIBLE,0);

    SendMessage(WM_SIZE);

}

顯示:

void CMainFrame::OnShow() 

    if(!m_wndToolBar.IsWindowVisible())

        m_wndToolBar.ModifyStyle(0,WS_VISIBLE);

[問題提出]

工具條也是視窗,是視窗就有标題,如何給工具條加标題?

[程式實作]

不想動态改變工具條的标題就在CMainFrame::OnCreate()中:

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)

 ......

 m_wndToolBar.SetWindowText(_T("Standdard"));

 return 0;

 }

 若想動态改變工具條的标題,如下:

 聲明一個菜單,并響應事件,如響應:OnMyToolBar()函數

 void CMainFrame::OnMyToolBar() 

 {

 // TODO: Add your command handler code here

CToolBar *pToolBar = (CToolBar *)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_TOOLBAR); 

pToolBar->SetWindowText (_T("Standdard"));

不要在TooBar懸浮時做OnMyToolBar()會出錯的. 

順便提一下如何獲得狀态條的指針:

CStatusBar * pStatusBar =(CStatusBar *)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);

顯示器的裝置坐标系的原點在客戶區的左上角,x軸向右增長,y軸向下增長。我們要設定的邏輯坐标系的原點則在客戶區的中心,x軸向右增長,y軸向上增長,如一個笛卡爾坐标系一般。

為CChildView添加一個成員函數void OnPrepareDC(CDC * pDC, CPrintInfo * pInfo = NULL);

void OnPrepareDC(CDC * pDC, CPrintInfo * pInfo){

  CRect rect;

  // 設定映射模式為LOMETRIC (0.1mm),右上為增長方向

  pDC->SetMapMode (MM_LOMETRIC);

  // 将坐标原點定在客戶區的中心

  GetClientRect(rect);

  pDC->SetViewportOrg(rect.Width()/2, rect.Height()/2);

為CChildView響應滑鼠移動消息,并在狀态條中顯示滑鼠的坐标值。m_ptMouse資料成員是原打算做十字交叉線用的,在此使用沒有實際意義。

void CChildView::OnMouseMove(UINT nFlags, CPoint point){

  CClientDC dc(this);

  CString str;

  OnPrepareDC(&dc);

  //要通路類CMainFrame,需要将mainfrm.h檔案引入

  CMainFrame * pFrame = (CMainFrame *) AfxGetApp()->m_pMainWnd;

  //要通路CMainFrame的資料成員m_wndStatusBar,需要手工修改mainfrm.h,public這個資料成員

  CStatusBar * pStatus = (CStatusBar *) &pFrame->m_wndStatusBar;

  m_ptMouse = point;

  str.Format ("裝置坐标 X=%i pixel, Y=%i pixel", m_ptMouse.x, m_ptMouse.y);

  pStatus->SetPaneText(1, str);

  dc.DPtoLP(&m_ptMouse);

  str.Format ("邏輯坐标 X=%i * 0.1mm, Y=%i * 0.1mm", m_ptMouse.x, m_ptMouse.y);

  pStatus->SetPaneText(2, str);

By default, a CStatusBar pane is not enabled when the pane is created. To activate a pane, you must call the ON_UPDATE_COMMAND_UI() macro for each pane on the status bar and update the panes. Because panes do not send WM_COMMAND messages, you cannot use ClassWizard to activate panes; you must type the code manually. For example, suppose one pane has ID_INDICATOR_PAGE as its identifier and that it contains the current page number in a document. To make the ID_INDICATOR_PAGE pane display text, add the following to a header file (probably the MAINFRM.H file):

afx_msg void OnUpdatePage(CCmdUI *pCmdUI);

Add the following to the application message map:

ON_UPDATE_COMMAND_UI(ID_INDICATOR_PAGE, OnUpdatePage)

Add the following to a source code file (probably MAINFRM.CPP):

void CMainFrame::OnUpdatePage(CCmdUI *pCmdUI)

    pCmdUI->Enable();

To display text in the panes, either call SetPaneText() or call CCmdUI::SetText() in the OnUpdate() function. For example, you might want to set up an integer variable m_nPage that contains the current page number. Then, the OnUpdatePage() function might read as follows:

    char szPage[16];

    wsprintf((LPSTR)szPage, "Page %d", m_nPage);

    pCmdUI->SetText((LPSTR)szPage);

This technique causes the page number to appear in the pane during idle processing in the same manner that the application updates other indicators.

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