16.對話框自動停靠在屏幕邊
const int DETASTEP = 50;
BOOL AdjustPos(CWnd *pWnd, CRect* lpRect)
{
//自動靠邊
int iSX = GetSystemMetrics(SM_CXFULLSCREEN);
int iSY = GetSystemMetrics(SM_CYFULLSCREEN);
RECT rWorkArea;
BOOL bResult = SystemParametersInfo(SPI_GETWORKAREA, sizeof(RECT), &rWorkArea, 0);
CRect rcWA;
if ( !bResult )
{
//如果調用不成功就利用GetSystemMetrics獲取屏幕面積
rcWA = CRect(0,0,iSX,iSY);
}
else
rcWA = rWorkArea;
int iX = lpRect->left;
int iY = lpRect->top;
if ( iX < rcWA.left + DETASTEP && iX!=rcWA.left )
{
//調整左
pWnd->SetWindowPos(NULL,rcWA.left,iY,0,0,SWP_NOSIZE);
lpRect->OffsetRect(rcWA.left-iX,0);
AdjustPos(lpRect);
return TRUE;
}
if ( iY < rcWA.top + DETASTEP && iY!=rcWA.top )
{
//調整上
pWnd->SetWindowPos(NULL ,iX,rcWA.top,0,0,SWP_NOSIZE);
lpRect->OffsetRect(0,rcWA.top-iY);
AdjustPos(lpRect);
return TRUE;
}
if ( iX + lpRect->Width() > rcWA.right - DETASTEP && iX !=rcWA.right-lpRect->Width() )
{
//調整右
pWnd->SetWindowPos(NULL ,rcWA.right-rcW.Width(),iY,0,0,SWP_NOSIZE);
lpRect->OffsetRect(rcWA.right-lpRect->right,0);
AdjustPos(lpRect);
return TRUE;
}
if ( iY + lpRect->Height() > rcWA.bottom - DETASTEP && iY !=rcWA.bottom-lpRect->Height() )
{
//調整下
pWnd->SetWindowPos(NULL ,iX,rcWA.bottom-rcW.Height(),0,0,SWP_NOSIZE);
lpRect->OffsetRect(0,rcWA.bottom-lpRect->bottom);
return TRUE;
}
return FALSE;
}
//然后在ONMOVEING事件中使用如下過程調用
CRect r=*pRect;
AdjustPos(this, &r);
*pRect=(RECT)r;
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17.單擊窗口任意位置都可拖動窗口
方法一：
添加 WM_LBUTTONDOWN 的消息映射
void CTest6Dlg::OnLButtonDown(UINT nFlags, CPoint point)
{
PostMessage(WM_NCLBUTTONDOWN, HTCAPTION, 0);
CDialog::OnLButtonDown(nFlags, point);
}
方法二：
添加 WM_NCHITTEST 的消息映射
注意：在classwizard->message中找不到WM_NCHITTEST的，需要在選項卡class info->message filter中選擇window后該消息才會出現在message中。
void CTest6Dlg::OnNCHitTest(CPoint point)
{
return HTCAPTION;
// return CDialog::OnNCHitTest(point);
}
或者參考
http://msdn.microsoft.com/msdnmag/issues/02/12/CQA/default.aspx
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18.用Enter鍵替換Tab鍵實現焦點切換
BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)
{
if ( pMsg->message == WM_KEYDOWN )
{
if ( pMsg->wParam == VK_RETURN )
pMsg->wParam = VK_TAB;
}
return CDialog::PreTranslateMessage(pMsg);
}
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19.在對話框添加快捷鍵
(1) 在CXXXApp中類中添加聲明
HACCEL m_haccel;
(2) 在resource view中右鍵點擊樹的根目錄，選擇insert，添加一個新的Accelerator，默認ID為IDR_ACCELERATOR1。
在其中添加相應菜單的快捷鍵。
(3) 在BOOL CXXXApp::InitInstance()中添加代碼
m_haccel = LoadAccelerators(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_ACCELERATOR1));
(4) 添加CXXXApp類的 ProcessMessageFilter 消息映射函數
BOOL CTest6App::ProcessMessageFilter(int code, LPMSG lpMsg)
{
if ( m_haccel )
{
if ( ::TranslateAccelerator(m_pMainWnd->m_hWnd, m_haccel, lpMsg) )
return TRUE;
}
return CWinApp::ProcessMessageFilter(code, lpMsg);
}
或者參考
Q100770：
How to use accelerator keys and a main menu on the dialog box in Visual C++
http://support.microsoft.com/kb/100770/en-us
Adding Hot Keys to your Application
http://msdn.microsoft.com/msdnmag/issues/1200/c/default.aspx
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20.對話框全屏
int cx, cy;
HDC dc = ::GetDC(NULL);
cx = GetDeviceCaps(dc,HORZRES) + GetSystemMetrics(SM_CXBORDER);
cy = GetDeviceCaps(dc,VERTRES) + GetSystemMetrics(SM_CYBORDER);
::ReleaseDC(0,dc);
// Remove caption and border
SetWindowLong(m_hWnd, GWL_STYLE,
GetWindowLong(m_hWnd, GWL_STYLE) & (~(WS_CAPTION | WS_BORDER)));
// Put window on top and expand it to fill screen
::SetWindowPos(m_hWnd, HWND_TOPMOST,
-(GetSystemMetrics(SM_CXBORDER)+1),
-(GetSystemMetrics(SM_CYBORDER)+1),
cx+1,cy+1, SWP_NOZORDER);
或參考
http://www.codeguru.com/cpp/w-d/dislog/dialog-basedapplications/article.php/c1837/
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21.控制對話框最大最小尺寸
(1) 對話框的屬性的必須是resizing的
(2) 打開classwizard->class info標簽頁->message filter中選擇window
(3) 添加 WM_GETMINMAXINFO 消息映射
void CTest6Dlg::OnGetMinMaxInfo(MINMAXINFO *lpMMI)
{
lpMMI->ptMinTrackSize = CPoint(200, 200);
}
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22. 創建無模式對話框
Q103788：
Creating a Modeless Dialog Box with MFC Libraries
http://support.microsoft.com/kb/103788/EN-US/
Visual C++ MFC Samples
MODELESS Sample: Uses a CDialog Object as a Modeless Dialog Box
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample/html/_sample_mfc_MODELESS.asp
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23.在對話框中改變菜單項狀態(enable/disable, check/uncheck, change text)
Q242577：
You cannot change the state of a menu item from its command user-interface handler if the menu is attached to a dialog box in Visual C++
http://support.microsoft.com/kb/242577/en-us
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24. 按下F1出現幫助
Q141724：
Context-Sensitive Help in a CDialog Object
http://support.microsoft.com/kb/141724/en-us
msdn中的介紹
http://msdn2.microsoft.com/en-us/library/dyd1yfww.aspx
或者如果你要屏蔽按下F1后出現的“找不到*.hlp文件”的提示對話框
添加 WM_HELPINFO 消息映射
BOOL CTest6Dlg::OnHelpInfo(HELPINFO* pHelpInfo)
{
return TRUE;
//return CDialog::OnHelpInfo(pHelpInfo);//屏蔽該句
}
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25. 對話框初始化設置輸入焦點的問題
默認情況下，對話框初始化顯示的焦點按照在對話框編輯期間設置的tab order的第一個控件來設置的。（設置tab order可在對話框的resource view中用Ctrl+D顯示出來，點鼠標進行順序設置）。如果想人為的改變初始化時的輸入焦點，可在對話框的OnInitDialog中把return TRUE; 改為 return FALSE;
MSDN上的解釋如下：
Return Value
Specifies whether the application has set the input focus to one of the controls in the dialog box. If OnInitDialog returns nonzero, Windows sets the input focus to the first control in the dialog box. The application can return 0 only if it has explicitly set the input focus to one of the controls in the dialog box.
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26. 在對話框間傳遞數據
CDlg1::OnButton1()
{
CDlg2 dlg2;
dlg2.m_str = _T("你好"; )
dlg2.m_bJudge = TRUE;
dlg2.DoModal();
}
//Dlg2.h
public:
CString m_str;
BOOL m_bJudge;
//Dlg2.cpp
CDlg2::OnInitDialog()
{
if (m_bJudge)
GetDlgItem(IDC_EDIT1)->SetWindowText(m_str);
}
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27. 在 dlg1 中打開 dlg2 時，dlg2 能修改 dlg1 中的成員變量
//dlg1.cpp
#include "dlg2.h"
CDlg1::OnButton1()
{
CDlg2 dlg2;
dlg2.m_pDlg1 = this;
dlg2.DoModal();
}
//dlg2.h
class CDlg1;//添加dlg1類的聲明
class CDlg2 : public CDialog
{
...
public:
CDlg1 *m_pDlg1;
}
//dlg2.cpp
#include "dlg1.h"
至此，你可以在dlg2.cpp中通過m_pDlg1操作CDlg1類中的成員變量了。
--------------------------------------------------------------------------------
28. 改變對話框字體，對話框大小改變的問題
Q145994：
How to calculate dialog box units based on the current font in Visual C++
http://support.microsoft.com/kb/q145994/
Q125681：
How To Calculate Dialog Base Units with Non-System-Based Font
http://support.microsoft.com/kb/125681/en-us
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29. 進行大數據量計算的時候，導致界面掛起無響應的問題
當在程序中需要進行大數據量計算的時候(比如搜索磁盤，大數據量傳輸等)，由于這些計算過程是在界面線程(UI Process)中，由此引發了界面線程的消息阻塞。我們創建一個工作線程(worker thread)來處理計算過程，以解決該問題。
下面是一個簡單的創建一個工作線程的實現:
//xxxdlg.h
static UINT MyThread(LPVOID pParam);
CWinThread* pMyThread;
//xxxdlg.cpp
CXXXDlg::OnButton1()
{
pMyThread = AfxBeginThread(MyThread, this);
pMyThread = NULL;
}
UINT CXXXDlg::MyThread(LPVOID pParam)
{
CXXXDlg *pDlg = (CXXXDlg *)pParam;
//這里添加計算過程
return 0;
}
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30. 工程資源的合并
以把B對話框的資源插入到A對話框為例：
(1) 生成一個*.ogx文件
打開B工程，在ClassView中鼠標右鍵點擊所需的對話框類，單擊"Add to Gallery"。
這時，會在 " C:\Program Files\Microsoft Visual Studio\Common\MSDev98\Gallery\工程B " 的目錄下產生一個ogx文件。
(2) 插入該*.ogx文件
打開A工程，選擇菜單Project->Add To Project->components and controls... ，選擇剛生成的ogx文件，然后Insert。
這時B對話框資源和對話框類就插入到A中了。。
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31. 在網上可以找到很多有用的代碼,我只是把一些常用的功能列出鏈接，方便查看
http://support.microsoft.com
http://www.codeproject.com/dialog/
http://www.codeguru.com/Cpp/W-D/dislog/
改變對話框大小時同時改變控件大小
http://www.codeproject.com/dialog/easysize.asp
http://www.codeproject.com/dialog/resizabledialog.asp
http://www.vchelp.net/vchelp/archive.asp?type_id=5&class_id=1&cata_id=1&article_id=548&search_term=
http://www.vchelp.net/vchelp/archive.asp?type_id=5&class_id=1&cata_id=1&article_id=538&search_term=
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如何在可變大小（resizing）的對話框中實現滾動窗口
Q262954：
How to create a resizeable dialog box with scroll bars in Visual C++
http://support.microsoft.com/default.aspx?scid=kb;en-us;262954
http://www.codeproject.com/dialog/scrollablechilddialog.asp
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從某一點或某一邊逐漸變大顯示對話框
http://www.codeproject.com/dialog/canidialog.asp
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一個重載的MessageBox類
http://www.codeproject.com/dialog/xmessagebox.asp
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option設置對話框(左邊是樹，右邊是子對話框)
實現原理：create多個child類型的對話框，然后全部hide，點擊左邊樹的item時，顯示相應子對話框。
Q103375：
MultiDlg.exe Demonstrates Dynamic Child Dialog Boxes
http://support.microsoft.com/kb/103375/en-us
http://www.codeproject.com/dialog/ezoptionsdlg.asp
http://www.codeproject.com/dialog/csettingsdlg.asp
http://www.codeguru.com/cpp/w-d/dislog/optionsdialogs/article.php/c1953/
http://www.codeguru.com/cpp/w-d/dislog/optionsdialogs/article.php/c2015/
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實現MSN的右下角的消息彈出提示窗口
http://www.codeproject.com/dialog/statusbarmsgwnd.asp
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Tip of the day(每日一貼)功能的實現
http://www.codeproject.com/dialog/XHTMLTipOfTheDay.asp
http://www.codeguru.com/cpp/w-d/dislog/tipoftheday/article.php/c4993/
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不規則對話框
http://www.codeproject.com/dialog/SimpleIrregular.asp
--------------------------------------------------------------------------------
擴展和收縮對話框
http://www.codeproject.com/dialog/dlgexpand.asp
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對話框漸變色
http://www.codeproject.com/dialog/WinMakeInactive.asp
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屏幕捕捉
http://www.codeproject.com/dialog/screencap.asp
--------------------------------------------------------------------------------
對話框菜單添加“最近使用文件列表”功能
http://www.codeproject.com/dialog/rfldlg.asp
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關閉對話框時，逐漸消失
http://www.codeguru.com/cpp/w-d/dislog/animation/article.php/c5063/
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對話框背景bitmap
http://www.codeguru.com/cpp/w-d/dislog/bitmapsimages/article.php/c1877/
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透明對話框
http://www.codeguru.com/cpp/w-d/dislog/miscellaneous/article.php/c5065/
http://www.codeguru.com/cpp/w-d/dislog/miscellaneous/article.php/c5019/
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在對話框中創建view
http://www.codeguru.com/cpp/w-d/dislog/article.php/c5009/
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Splash Screen
Q817372：
How to insert a splash screen in a dialog-based application by using Visual C++ .NET or Visual C++ 2005
http://support.microsoft.com/kb/817372/en-us
Q815376：
How to create and insert a splash screen in an SDI application or in an MDI application by using Visual C++ .NET or Visual C++ 2005
http://support.microsoft.com/kb/815376/en-us
http://www.codeguru.com/cpp/w-d/dislog/splashscreens/article.php/c2011/
http://www.codeguru.com/cpp/w-d/dislog/miscellaneous/article.php/c5019/
http://www.codeguru.com/cpp/w-d/dislog/splashscreens/article.php/c5029/
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分割對話框
http://www.codeguru.com/cpp/w-d/dislog/splitterwindowswithingdialogs/article.php/c4973/
http://www.codeguru.com/cpp/w-d/dislog/splitterwindowswithingdialogs/article.php/c2031/
http://www.codeguru.com/cpp/w-d/dislog/splitterwindowswithingdialogs/article.php/c1979/
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標題欄Title Bar
http://www.codeguru.com/cpp/w-d/dislog/titlebar/article.php/c1897/
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添加狀態欄statusbar和工具欄toolbar
Q123158：
Adding Control Bars to Foundation Classes Dialogs
http://support.microsoft.com/kb/123158/en-us
Visual C++ MFC Samples
DLGCBR32 Sample: Demonstrates Adding a Status Bar and Toolbar to Dialog Boxes
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample/html/_sample_mfc_DLGCBR32.asp
http://www.codeguru.com/cpp/w-d/dislog/toolbarsandstatusbars/article.php/c1955/
http://www.codeguru.com/cpp/w-d/dislog/toolbarsandstatusbars/article.php/c1939/
http://www.codeguru.com/cpp/w-d/dislog/toolbarsandstatusbars/article.php/c1949/
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Tooltip
Q141758：
How to add tooltips for controls to an MFC modal dialog box
http://support.microsoft.com/kb/141758/en-us
http://www.codeguru.com/cpp/w-d/dislog/tooltipsfordialogcontrols/article.php/c2017/
http://www.codeguru.com/cpp/w-d/dislog/tooltipsfordialogcontrols/article.php/c1843/
http://www.codeguru.com/cpp/w-d/dislog/tooltipsfordialogcontrols/article.php/c1839/
http://www.codeproject.com/miscctrl/pptooltip.asp
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從對話框邊緣平滑彈出對話框
http://www.codeguru.com/cpp/w-d/dislog/miscellaneous/article.php/c5061/