Dewsoft Frontpage Tutorials

Lesson - 4:Documents and Views

4.4: Other View Classes

The view classes generated by AppWizard in this Unit’s sample applications have been derived from MFC’s CView class. There are cases, however, when it is to your advantage to derive your view class from one of the other MFC view classes derived from CView. These additional classes provide your view window with special capabilities such as scrolling and text editing. Table 4.1 lists the various view classes along with their descriptions.

Table 4.1 View Classes

Class
Description

CView The base view class from which the specialized view classes are derived

CCtrlView A base class from which view classes that implement 32-bit Windows common controls (such as the ListView, TreeView, and RichEdit controls) are derived

CDaoRecordView Same as CRecordView, except used with the OLE DB database classes

CEditView A view class that provides basic text-editing features

CFormView A view class that implements a form-like window using a dialog box resource

CHtmlView A view class that can display HTML, with all the capabilities of Microsoft Internet Explorer

CListView A view class that displays a ListView control in its window

COleDBRecordView Same as CRecordView, except used with the DAO database classes

CRecordView A view class that can display database records along with controls for navigating the database

CRichEditView A view class that provides more sophisticated text-editing capabilities by using the RichEdit control

CScrollView A view class that provides scrolling capabilities

CTreeView A view class that displays a TreeView control in its window

To use one of these classes, substitute the desired class for the CView class in the application’s project. When using AppWizard to generate your project, you can specify the view class you want in the wizard’s Step 6 of 6 dialog box, as shown in Figure 4.3. When you have the desired class installed as the project’s view class, you can use the specific class’s member functions to control the view window.

A CEditView object, on the other hand, gives you all the features of a Windows edit control in your view window. Using this class, you can handle various editing and printing tasks, including find-and-replace. You can retrieve or set the current printer font by calling the GetPrinterFont() or SetPrinterFont() member function or get the currently selected text by calling GetSelectedText(). Moreover, the FindText() member function locates a given text string, and OnReplaceAll() replaces all occurrences of a given text string with another string.

FIG. 4.3 You can use AppWizard to select your application’s base view class.

The CRichEditView class adds many features to an edit view, including paragraph formatting (such as centered, right-aligned, and bulleted text), character attributes (including underlined, bold, and italic), and the capability to set margins, fonts, and paper size. As you might have guessed, the CRichEditView class features a rich set of methods you can use to control your application’s view object.

Figure 4.4 shows how the view classes fit into MFC’s class hierarchy. Describing these various view classes fully is beyond the scope of this Unit.

FIG. 4.4 The view classes all trace their ancestry back to CView.

Next>>