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Walkthrough: Updating the MFC Scribble Application (Part 1)

  • Articolo

This walkthrough demonstrates how to modify an existing MFC application to use the Ribbon user interface. Visual Studio supports both the Office 2007 Ribbon and the Windows 7 Scenic Ribbon. For more information about the Ribbon user interface, see Ribbons on the MSDN Web site.

This walkthrough modifies the classic Scribble 1.0 MFC sample that lets you use the mouse to create line drawings. This part of the walkthrough shows how to modify the Scribble sample so that it displays a ribbon bar. Part 2 adds more buttons to the ribbon bar.

Prerequisites

SCRIBBLE Sample: MFC MDI Drawing Application

RibbonGadgets Sample: Ribbon Gadgets Application

Sections

This part of the walkthrough has the following sections:

  • Replacing the Base Classes

  • Adding Bitmaps to the Project

  • Adding a Ribbon Resource to the Project

  • Creating an Instance of the Ribbon Bar

  • Adding a Ribbon Category

  • Setting the Look of the Application

Replacing the Base Classes

To convert an application that supports a menu to an application that supports a ribbon, you must derive the application, frame window, and toolbar classes from updated base classes. (We suggest that you do not modify the original Scribble sample; instead, clean the Scribble project, copy it to another directory, and then modify the copy.)

To replace the base classes in the Scribble application

  1. In scribble.cpp, verify that CScribbleApp::InitInstance includes a call to AfxOleInit.

  2. Add the following code to the stdafx.h file.

    #include <afxcontrolbars.h>

  3. In scribble.h, modify the definition for the CScribbleApp class so that it is derived from CWinAppEx Class.

    class CScribbleApp: public CWinAppEx

  4. Scribble 1.0 was written when Windows applications used an initialization (.ini) file to save user preference data. Instead of an initialization file, modify Scribble to store user preferences in the registry. To set the registry key and base, type the following code in CScribbleApp::InitInstance after the LoadStdProfileSettings() statement.

    SetRegistryKey(_T("MFCNext\\Samples\\Scribble2"));
SetRegistryBase(_T("Settings"));

  5. The main frame for a multiple document interface (MDI) application is no longer derived from the CMDIFrameWnd class. Instead, it is derived from the CMDIFrameWndEx class.

    In the mainfrm.h and mainfrm.cpp files, replace all references to CMDIFrameWnd with CMDIFrameWndEx.

  6. In the childfrm.h and childfrm.cpp files, replace CMDIChildWnd with CMDIChildWndEx.

    In the childfrm. h file, replace CSplitterWnd with CSplitterWndEx.

  7. Modify toolbars and status bars to use the new MFC classes.

    In the mainfrm.h file:

    1. Replace CToolBar with CMFCToolBar.

    2. Replace CStatusBar with CMFCStatusBar.

  8. In the mainfrm.cpp file:

    1. Replace m_wndToolBar.SetBarStyle with m_wndToolBar.SetPaneStyle

    2. Replace m_wndToolBar.GetBarStyle with m_wndToolBar.GetPaneStyle

    3. Replace DockControlBar(&m_wndToolBar) with DockPane(&m_wndToolBar)

  9. In the ipframe.cpp file, comment out the following three lines of code.

    m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
pWndFrame->EnableDocking(CBRS_ALIGN_ANY);
pWndFrame->DockPane(&m_wndToolBar);

  10. If you intend to link your application statically, add the following code to the start of the project resource (.rc) file.

    #include "afxribbon.rc"

    The afxribbon.rc file contains resources that are required at run time. The MFC Application Wizard includes this file automatically when you create an application.

  11. Save the changes and then build and run the application.

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Adding Bitmaps to the Project

The next four steps of this walkthrough require bitmap resources. You can obtain appropriate bitmaps in various ways:

  • Use the Resource Editors to invent your own bitmaps. Or use the resource editors to assemble bitmaps from the portable network graphics (.png) images that are included with Visual Studio. These images are in the VS2008ImageLibrary directory. 

    However, the Ribbon user interface requires that certain bitmaps support transparent images. Transparent bitmaps use 32-bit pixels, where 24 bits specify the red, green, and blue components of the color, and 8 bits define an alpha channel that specifies the transparency of the color. The current resource editors can view, but not modify bitmaps with 32-bit pixels. Consequently, use an external image editor instead of the resource editors to manipulate transparent bitmaps.

  • Copy an appropriate resource file from another application to your project and then import bitmaps from that file.

This walkthrough copies resource files from an application in the Samples directory.

To add bitmaps to the Project

  1. Use the Windows Explorer to copy the following .bmp files from the resources directory (res) of the RibbonGadgets sample:

    1. Copy main.bmp to your Scribble project.

    2. Copy filesmall.bmp and filelarge.bmp to your Scribble project.

    3. Make new copies of the filelarge.bmp and filesmall.bmp files, but save the copies in the RibbonGadgets sample. Rename the copies homesmall.bmp and homelarge.bmp and then move the copies to your Scribble project.

    4. Make a copy of the toolbar.bmp file, but save the copy in the RibbonGadgets sample. Rename the copy panelicons.bmp and then move the copy to your Scribble project.

  2. Import the bitmap for an MFC application. In Resource View, double-click the scribble.rc node, double-click the Bitmap node, and then click Add resource. On the dialog box that appears, click Import. Browse to the res directory, select the main.bmp file, and then click Open.

    The main.bmp bitmap contains a 26x26 image. Change the ID of the bitmap to IDB_RIBBON_MAIN.

  3. Import the bitmaps for the file menu that is attached to the Application button.

    1. Import the filesmall.bmp file, which contains ten 16x16 (16x160) images. Because we need only eight 16x16 images (16x128), use the Resource View to change the width of that bitmap from 160 to 128. Change the ID of the bitmap to IDB_RIBBON_FILESMALL.

    2. Import the filelarge.bmp, which contains eight 32x32 (32x256) images. Change the ID of the bitmap to IDB_RIBBON_FILELARGE.

  4. Import the bitmaps for the ribbon categories and panels. Each tab on the ribbon bar is a category, and consists of a text label and an optional image.

    1. Import the homesmall.bmp bitmap, which contains eight 16x16 images for small button bitmaps. Change the ID of the bitmap to IDB_RIBBON_HOMESMALL.

    2. Import the homelarge.bmp bitmap, which contains eight 32x32 images for large button bitmaps. Change the ID of the bitmap to IDB_RIBBON_HOMELARGE.

  5. Import bitmaps for the resized ribbon panels. These bitmaps, or panel icons, are used after a resize operation if the ribbon is too small to display the entire panel.

    1. Import the panelicons.bmp bitmap, which contains eight 16x16 images. In the Properties window of the Bitmap Editor, adjust the width of the bitmap to 64 (16x64). Change the ID of the bitmap to IDB_PANEL_ICONS.

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Adding a Ribbon Resource to the Project

When you convert an application that uses menus to an application that uses a ribbon, you do not have to remove or disable the existing menus. Instead, you create a ribbon resource, add ribbon buttons, and then associate the new buttons with the existing menu items. Although the menus are no longer visible, messages from the ribbon bar are routed through the menus. In addition, menu shortcuts continue to work.

A ribbon consists of the Application button, which is the large button on the upper-left side of the ribbon, and one or more category tabs. Each category tab contains one or more panels that act as containers for ribbon buttons and controls. The following procedure shows how to create a ribbon resource and then customize the Application button.

To add a ribbon resource to the project

  1. On the Project menu, click Add Resource.

  2. In the Add Resource dialog box, select Ribbon and then click New.

    Visual Studio creates a ribbon resource and opens it in the design view. The ribbon resource ID is IDR_RIBBON1, which is displayed in Resource View. The ribbon contains one category and one panel.

  3. You can customize the Application button by modifying its properties. The message IDs that are used in this code are already defined in the menu for Scribble 1.0.

  4. In the design view, click the Application Button to display its properties. Change property values as follows: Image to IDB_RIBBON_MAIN, Prompt to File, Keys to f, Large Images to IDB_RIBBON_FILELARGE, and Small Images to IDB_RIBBON_FILESMALL.

  5. The following modifications create the menu that appears when the user clicks the Application button. Click the ellipsis (...) next to Main Items to open the Items Editor.

    1. Click Add to add a button. Change Caption to &New, ID to ID_FILE_NEW, Image to 0, Image Large to 0.

    2. Click Add to add a second button. Change Caption to &Save, ID to ID_FILE_SAVE, Image to 2, and Image Large to 2.

    3. Click Add to add a third button. Change Caption to Save &As, ID to ID_FILE_SAVE_AS, Image to 3, and Image Large to 3.

    4. Click Add to add a fourth button. Change Caption to &Print, ID to ID_FILE_PRINT, Image to 4, and Image Large to 4.

    5. Change the Item type to Separator and then click Add.

    6. Change the Item type to Button. Click Add to add a fifth button. Change Caption to &Close, ID to ID_FILE_CLOSE, Image to 5, and Image Large to 5.

  6. The following modifications create a submenu under the Print button that you created in the previous step.

    1. Click the Print button, change the Item type to Label, and then click Insert. Change Caption to Preview and print the document.

    2. Click the Print button, change the Item type to Button, and click Insert. Change Caption to &Print, ID to ID_FILE_PRINT, Image to 4, and Image Large to 4.

    3. Click the Print button and then click Insert to add a button. Change Caption to &Quick Print, ID to ID_FILE_PRINT_DIRECT, Image to 7, and Image Large to 7.

    4. Click the Print button and then click Insert to add another button. Change Caption to Print Pre&view, ID to ID_FILE_PRINT_PREVIEW, Image to 6, and Image Large to6.

    5. You have now modified the Main Items. Click Close to exit the Items Editor.

  7. The following modification creates an exit button that appears at the bottom of the Application button menu.

    1. In the Properties window, click the ellipsis (...) next to Button to open the Items Editor.

    2. Click Add to add a button. Change Caption to E&xit, ID to ID_APP_EXIT, Image to8.

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Creating an Instance of the Ribbon Bar

The following steps show how to create an instance of the ribbon bar when your application starts. To add a ribbon bar to an application, declare the ribbon bar in the mainfrm.h file. Then, in the mainfrm.cpp file, write code to load the ribbon resource.

To create an instance of the ribbon bar

  1. In the mainfrm.h file, add a data member to the protected section of CMainFrame, the class definition for the main frame. This member represents the ribbon bar.

    // Ribbon bar for the application
CMFCRibbonBar  m_wndRibbonBar;

  2. In the mainfrm.cpp file, add the following code before the final return statement at the end of the CMainFrame::OnCreate function. This creates an instance of the ribbon bar.

    // Create the ribbon bar
if (!m_wndRibbonBar.Create(this))
{
return -1;   //Failed to create ribbon bar
}
m_wndRibbonBar.LoadFromResource(IDR_RIBBON1);

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Customizing the Ribbon Resource

Now that you have created the Application button, you can add elements to the ribbon.

Nota

This walkthrough uses the same panel icon for all panels. However, you can use other image list indexes to display other icons.

To add a Home category and Edit panel

  1. The Scribble program requires only one category. In the design view, click Category to display its properties. Change property values as follows: Caption to &Home, Large Images to IDB_RIBBON_HOMELARGE, Small Images to IDB_RIBBON_HOMESMALL.

  2. Each ribbon category is organized into named panels. Each panel contains a set of controls that perform related operations. This category has one panel. Click Panel, and then change Caption to Edit and Image Index to 0.

  3. To the Edit panel, add a button that is responsible for clearing the contents of the document. The message ID for this button has already been defined in the IDR_SCRIBBTYPE menu resource. Specify Clear All as the button text and the index of the bitmap that decorates the button. Open the Toolbox, and then drag a Button to the Edit panel. Click the button and then change Caption to Clear All, ID to ID_EDIT_CLEAR_ALL, Image Index to 0, Large Image Index to 0.

  4. Save the changes, and then build and run the application. The Scribble application should be displayed, and it should have a ribbon bar at the top of the window instead of a menu bar. The ribbon bar should have one category, Home, and Home should have one panel, Edit. The ribbon buttons that you added should be associated with the existing event handlers, and the Open, Close, Save, Print, and Clear All buttons should work as expected.

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Setting the Look of the Application

A visual manager is a global object that controls all drawing for an application. Because the original Scribble application uses the Office 2000 user interface (UI) style, the application may look old-fashioned. You can reset the application to use the Office 2007 visual manager so that it resembles an Office 2007 application.

To set the look of the application

  1. In the CMainFrame::OnCreate function, type the following code to change the default visual manager and style.

    // Set the default manager to Office 2007 
CMFCVisualManager::SetDefaultManager(RUNTIME_CLASS(CMFCVisualManagerOffice2007));
CMFCVisualManagerOffice2007::SetStyle(CMFCVisualManagerOffice2007::Office2007_LunaBlue);

  2. Save the changes, and then build and run the application. The application UI should resemble the Office 2007 UI.

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Next Steps

You have modified the classic Scribble 1.0 MFC sample to use the Ribbon Designer. Now go to Part 2.

See Also

Tasks

Walkthrough: Updating the MFC Scribble Application (Part 2)

Other Resources

Walkthroughs (MFC)

Scribble Sample: MFC MDI Drawing Application