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It is tempting to use our own terminology and establish our own conventions here. For example, why not use an Album main menu instead of the File menu, or have Ctrl+N as the shortcut for View-Next rather than File-New. The short answer: don t do it. Computer users appreciate familiarity and resist change (so do most consumers and small children, but I digress). The File menu is standard in most Windows applications, and Ctrl+N is used for creating a new object (be it a document in Microsoft Word, or an image in Adobe PhotoDeluxe). Unless you are intending your application to be somewhat contrary, use existing standards where possible. So even though Ctrl+N and Ctrl+P would make nice shortcuts for Next and Previous, we will stick with Ctrl+N for New and save Ctrl+P for when we add printing in part 3 of the book. We have already looked at menus in chapter 3, so this section will remove the existing Load menu and add our new menu structure.
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Set the version number of the MyPhotos application to 6.1. REMOVE THE LOAD MENU Action 1 In the MainForm.cs [Designer] window, remove the Load menu from the File menu.
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Results The menu and its properties are removed from the program. Note: The menuLoad_Click method remains in the source file. We will make use of this code when we handle the Add menu later in this chapter.
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a. Right-click the menu item. b. Select Delete.
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Click the menu item and press the Delete key.
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DESIGN ISSUES
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The creation of our menu requires the procedures we saw in chapter 3. The following table creates and positions the new menu items required in our application. The subsequent sections will look at the required event handlers for these menu items.
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CREATE OUR NEW MENU Action 2 Create the new File menu structure, as shown in the following table.
Settings MenuItem New Property (Name) Shortcut Text Open (Name) Shortcut Text separator Save (Name) Shortcut Text Save As separator Exit as before (Name) Text menuSave CtrlS &Save menuSaveAs Save &As... Value menuNew CtrlN &New menuOpen CtrlO &Open
Result The new settings appear in the window and are reflected in the MainForm.cs file.
Note: Recall that a menu separator is added by creating a MenuItem with the Text property set to a single dash - . 3 Define a new Edit menu between the existing File and View menus.
How to
Note: This space intentionally left blank.
a. Click the Type Here entry on the menu bar, to the right of the existing View menu. b. Enter the name &Edit in this space and press Enter. c. Using the mouse, click on the new Edit menu and drag it left to appear between the File and View menus.
Settings Property (Name) Text Value menuEdit &Edit
Note: If you are not using Visual Studio, create the new menu manually, and set the Index property for each of the File, Edit, and View menus to 0, 1, and 2 respectively.
CHA PTE R 6
COMMON FILE DIALOGS
CREATE OUR NEW MENU (continued) Action 4 Add the dropdown menu for the Edit menu.
Settings MenuItem Add Property (Name) Shortcut Text Remove (Name) Shortcut Text Value menuAdd CtrlA &Add menuRemove CtrlR &Remove
Result
Create the View menu structure:
Settings MenuItem Image separator Next (Name) Shortcut Text Previous (Name) Shortcut Text menuNext CtrlShiftN &Next menuPrevious CtrlShiftP &Previous Property as before Value
The source code generated here does not use anything we have not already seen and discussed in chapter 3, so we will move right along and start processing our new menus. 6.1.2 ADDING CLASS VARIABLES Before we can implement any event handlers for our menus, and in particular before we can open and save album files, we must have a PhotoAlbum at our disposal in the MainForm class. In chapter 5 we added a reference to the MyPhotoAlbum library in the MyPhotos project, so this library is already available to our application. Here we will add some protected variables to hold the displayed album and whether the user has made any changes to this album.
CREATE SOME CLASS VARIABLES Action 1 At the top of the MainForm.cs file, indicate that we are using the MyPhotoAlbum namespace. Result
using Manning.MyPhotoAlbum;
Note: Since we already reference the library (remember, no header files required), we could write the fully qualified name every time we reference an object from the library. Typing Manning.MyPhotoAlbum.PhotoAlbum repeatedly is not my idea of fun, so adding a using directive here makes sense.
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