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CSettingsDialog, a Dialog Customizing Your Project Settings and More

9loong >《用戶界面》

2009.11.30

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Introduction

This article extends Chris Losinger's work on CSAPrefsDlg.

CSettingsDialog is an MFC class which enables to customize the project settings. The settings of a project are categorized as pages based on their nature of those pages. If you are familiar with the Netscape preferences-dialog, you will have no problem understanding the interfaces of CSettingsDialog

Unlike those similar dialogs posted in CodeProject and CodeGuru, which only allow one type of Window (e.g.,CPropertyPage or CDialog), CSettingsDialog allows any CWnd derived windows to be used as setting pages (Look at the demo figures above, a property page, a form view and a generic CWnd Windows are used for different settings.I believe that this design extend the applicability of the class to meet the need of various situations. Furthermore, each tree node does not have to have a setting page to be associated, it can be a generic tree node, e.g., a label used as a category index.

New features are added to this newest version. CHtmlView is supported (take a look at the first demo picture). However, in order to use the CHtmlView (or derived) class, you need to override the OnMouseActive virtual function to avoid the ASSERTion error in your CHtmlView (or derived) class. Another new feature of CSettingsDialog is that it support both modal and modaless state of display. There are some rules need to be followed. For the modeless dialog, the dialog variable must be declared as a pointer and be instantiated using new operator. You need to create the dialog using member function CSettingsDialog::Create() and using ShowWindow(SW_SHOW) to diaplay the dialog. The Apply button in the dialog is disabled in the modal state and is enabled in the modeless state.

How to use `CSettingsDialog`

Use of the class is pretty simple. Just follow the following steps:

Add the following files to your project :
- SettingsDialog.cpp, SettingsDialog.h
- CSAPrefsStatic.cpp,.h
Copy the IDD_SETTINGS_DLG dialog resource from the sample project to your project.
Create your Settings "pages" in the resource editor. If the page is a dialog, make sure that the dialog has the following settings:
- Style - Child
- Border - None
- No OK or Cancel buttons!
Use Class Wizard to create the dialog classes for the pages.

If used as a modal dialog: Create and initialize the CSettingsDialog as demonstrated in the demo project: CSettingsDialog dlg;

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CSettingsDialog dlg;    dlg.AddPage(RUNTIME_CLASS(CMyHtmlView), _T("Project Setting"), 0);    CPropPage1 *pModelPage = (CPropPage1*) dlg.AddPage(RUNTIME_CLASS(CPropPage1),    _T("Model"), IDD_PROPERTY_PAGE1,    _T("Project Setting"));    dlg.AddPage(RUNTIME_CLASS(CPropPage2), _T("Visibility"),    IDD_PROPERTY_PAGE2, pModelPage);    dlg.AddPage(RUNTIME_CLASS(CMyFormView),    _T("Form View"), IDD_FORMVIEW, pModelPage);    dlg.AddPage(RUNTIME_CLASS(CMyView), _T("Generic View Page"), 0);    dlg.AddPage(NULL, _T("Generic Tree Item"), 0);    dlg.SetTitle("Project Settings");    dlg.SetLogoText("CSettingsDialog 1.0");    int nResponse = dlg.DoModal();    if (nResponse == IDOK)    {    // TODO: Place code here to handle when the dialog is        //  dismissed with OK    }    else if (nResponse == IDCANCEL)    {    // TODO: Place code here to handle when the dialog is        //  dismissed with Cancel    }

If used as a modaless dialog:

Declare a CSettingsDialog variable as a pointer in your parent window class, eg.,m_pDlg in CMainFrame.

Instantiate an object of CSettingsDialog:

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        CSettingsDialog *m_pDlg = new CSettingsDialog(this) ;

create, initialize, and display the settings pages and dialog, e.g.,

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if (!m_pDlg)        {        m_pDlg = new CSettingsDialog(this);        m_pDlg->AddPage(RUNTIME_CLASS(CMyHtmlView),        _T("Project Setting"), 0);        CPropPage1 *pModelPage        = (CPropPage1*) m_pDlg->AddPage(RUNTIME_CLASS(CPropPage1),        _T("Model (PropertyPage)"), IDD_PROPERTY_PAGE1,        _T("Project Setting"));        m_pDlg->AddPage(RUNTIME_CLASS(CPropPage2),        _T("Visibility (PropertyPage)"), IDD_PROPERTY_PAGE2,        pModelPage);        m_pDlg->AddPage(RUNTIME_CLASS(CMyFormView), _T("Form View"),        IDD_FORMVIEW, pModelPage);        m_pDlg->AddPage(RUNTIME_CLASS(CMyView), _T("Generic View Page"), 0);        m_pDlg->AddPage(NULL, _T("Generic Tree Item"), 0);        m_pDlg->SetTitle("Project Settings");        m_pDlg->SetLogoText("CSettingsDialog 1.0");        m_pDlg->Create();        }        m_pDlg->ShowWindow(SW_SHOW);

Add a message handler of CSettingsDialog in your parent window which "owns" the dialog.
Finally do not forget to free the dialog memory in the parent window's destructor.
If you are not sure exactly how to do it, take a look at the attached demo project,

Acknowledgments

Chris Losinger for his CSAPrefsDialog (I modified from) and CSAPrefsStatic (I used directly) classes

History

V1.0 02/12/02 First version of the class
V1.1 03/01/02
- Memory leak bug fixed.
- Thick frame style of CView type class (including CFormView) is removed to make it look more industrial standard.
- Html view supported.
V1.2 03/08/02 Both modal and modaless states supported. The demo project shows the CSettingsDialog in both modal and modaless way.