Mastering Visual Basic .NET

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838 Chapter 19 THE MULTIPLE DOCUMENT INTERFACE Figure 19.1 Using Excel in MDI mode Figure 19.2 Paint Shop Pro, one of the most popular graphics applications, uses the MDI user interface. MDI applications aren’t very common; not too many applications lend themselves to MDI implementation. Most of them are easier to implement with multiple forms, but some applications should be implemented with an MDI interface. These are the applications that can open multiple documents
MDI APPLICATIONS: THE BASICS of the same type and use a common menu structure that applies to all open documents. In the following sections, we are going to discuss the basic behavior of MDI applications, their differences from regular Single Document Interface (SDI) applications, and how to build MDI applications. MDI Applications: The <strong>Basic</strong>s MDI applications must have at least two forms, the parent form and one or more child forms. There may be many child forms contained within the parent form, but there can be only one parent form. The parent form is the MDI form, or MDI container, because it contains all child forms. The parent form may not contain any controls. While the parent form is open in design mode, the icons on the Toolbox aren’t disabled, but you can’t place any controls on the form. The parent form can, and usually does, have its own menu. While one or more child forms are displayed, the menu of the child forms takes over and it’s displayed on the MDI form’s menu bar. This is not a requirement, of course, and you can manipulate the parent form’s menu with the techniques we discussed in Chapter 4. In this chapter, you’ll learn about a feature that is specific to the menus of MDI applications, namely how to merge two different menus—the menu of the MDI form and the menu of the child forms. In the following section, we’re going to build a simple MDI application. In the process, we’ll discuss the steps that are unique to an MDI application. Building an MDI Application Building an MDI application is a fairly straightforward process, but quite a few steps are unique to MDI applications. In this section, we’re going to build a typical MDI application that demonstrates all the built-in features of the MDI. In a later section, we’re going to add more functionality to this application. As you will see, once you get the interface right and you have the skeleton of a working MDI application, adding specific functionality to it is as simple as adding functionality to an SDI application. In effect, all the code belongs to the child form, and the MDI form is simply a container with a few lines of supporting code. The application we’ll build in this section is the skeleton of an MDI text-editing application, and it’s shown in Figure 19.3. All child forms of the application are the same, and they determine the functionality of the application. The commands of the menu are placeholders, with no code behind them—we’ll add the code later. For now, we’re going to focus on the mechanics of designing MDIs. Before building the application, let’s go over the basic characteristics of an MDI application. When you start an MDI application, you see the container form. Most applications automatically display a new document of the type they can handle. Excel, for instance, opens a new XLS file when you start it. Closing this document disables most of the commands in Excel’s menus. Without an active document, these commands are meaningless. They’re activated automatically again as soon as a new document is opened on a child form. The child forms usually have more menu commands, which are merged with the initial menu of the MDI form’s menu commands. The child forms don’t display their own menus. When you design a child form, you add a menu as usual, but this menu will appear on the menu bar of the MDI form—it will either replace the initial menu of the MDI form or it will be merged with it. You may have also noticed that the menu of an MDI application changes according to the state of the document on the active child form. If you 839
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Using Your Sybex Electronic Book To
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Associate Publisher: Richard Mills
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To my family
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Contents at a Glance Introduction.
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Introduction Welcome to .NET and Vi
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INTRODUCTION How About the Advanced
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INTRODUCTION browser. Web services
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Chapter 1 Getting Started with VB.N
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Figure 1.1 This is what you’ll se
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Figure 1.3 The integrated developme
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In the Properties window, also know
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THE INTEGRATED DEVELOPMENT ENVIRONM
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Figure 1.8 A simple application tha
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Listing 1.1: Processing a User-Supp
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Figure 1.10 Displaying options on a
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THE IDE COMPONENTS As you realize,
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Figure 1.13 Viewing the possible se
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THE IDE COMPONENTS Tools Menu This
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generated by the compiler, and you
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Controls expose methods, too, which
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a new application, place a Button c
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Listing 1.4: A Console Application
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Chapter 2 Visual Basic Projects The
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value. In effect, this is the essen
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BUILDING A LOAN CALCULATOR 2. Place
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Show Payment button won’t have an
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◆ The second argument is the dura
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BUILDING A LOAN CALCULATOR Exit Sub
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The Single data type can hold much
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aligned in many ways, so don’t wo
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Listing 2.4: The Clear Button Priva
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subroutine on a form on which the v
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The result variable will most likel
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clearDisplay = True End Sub Private
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VB6 programmers used the term error
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little early in the book to discuss
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TAKING THE LOANCALCULATOR TO THE WE
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Figure 2.9 Editing the Web form’s
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created and displayed. If the varia
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WORKING WITH MULTIPLE FORMS Working
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Applications designed for the Windo
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Figure 2.15 Adding a Setup and Depl
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The Manufacturer property will beco
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you’re ready to build an installe
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Verifying the Installation You alre
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Chapter 3 Visual Basic: The Languag
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Variables in VB.NET are more than j
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When you declare variables in your
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If you want to declare multiple var
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Table 3.1: Visual Basic Numeric Dat
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In a button’s Click event handler
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of the floating point, and it’s a
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and display the variable’s value:
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This listing will generate a NaN va
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Boolean operators operate on Boolea
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Char data type exposes interesting
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If the Strict option is on, you can
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Figure 3.1 Setting the Strict and E
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This is called late binding, and it
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subtle errors, and they avoid it. I
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When the Strict option is On, VB.NE
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To declare variables of this new ty
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{ use brush object to draw with } b
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numeric value, or click the Cancel
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variable without good reason. Varia
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they’re used by a couple of funct
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The name of the constant follows th
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salary, but even this data can be h
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The first element is names(0), and
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You can think of a three-dimensiona
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Note that the ReDim statement can
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VARIABLES AS OBJECTS the meantime,
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Notice that ToString is a method, n
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Formatting Dates To format dates, u
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If…Then…Else A variation of the
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The Select Case structure tests a s
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Loop Structures Loop structures all
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To execute a block of statements un
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While…End While The While…End W
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the code automatically as you edit.
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SUMMARY Summary It’s been a long
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152 Chapter 4 WRITING AND USING PRO
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Chapter 5 Working with Forms In Vis
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Clicking the icon on the left end o
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AutoScrollMinSize This property let
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Or, you can set the width and heigh
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“Building Dynamic Forms at Runtim
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Figure 5.4 A simple data-entry scre
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compares the key pressed to the F10
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Figure 5.5 The settings of the Anch
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Figure 5.8 Filling a form with two
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Figure 5.10 An elaborate form with
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There’s a better approach to impo
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As mentioned earlier, the Paint eve
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Figure 5.12 In the Properties windo
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Another technique for exposing the
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Here, PasswordForm is the name of t
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Listing 5.5: Prompting the User for
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MsgBox(MainForm.strProperty, MsgBox
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The DLG variable is declared on the
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Table 5.6: The Captions and Names o
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Programming Menu Commands Menu comm
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DESIGNING MENUS Using Access and Sh
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Table 5.7: LongMenu Command Structu
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Listing 5.11: Programming Dynamic M
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The code behind the Map Menu button
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ttn.Text = “New Button” bttn.Le
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control type. The following stateme
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Next Else For i = Me.Controls.Count
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Creating Event Handlers at Runtime
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Chapter 6 Basic Windows Controls In
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THE TEXTBOX CONTROL Basic Propertie
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THE TEXTBOX CONTROL The AcceptsTab
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Listing 6.1: Locating a String in a
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SelectedText property. To convert t
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THE TEXTBOX CONTROL Undoing Edits A
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Table 6.1: The Menu of the TextPad
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The Process and Customize Menus The
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the control to be shared. In our ca
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The code of the Find Again button i
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some custom preprocessing of the da
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With a little additional effort, yo
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Items The Items property is a colle
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Each member of the Items collection
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where item is the object to be adde
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Figure 6.7 ListDemo demonstrates mo
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The second arrow button transfers i
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If you search for “SAC”, for ex
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There’s one aspect worth mentioni
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You can also add new items at runti
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VB.NET at Work: The Colors Project
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Listing 6.17: Programming the Scrol
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The Label controls below the tick m
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Listing 6.19: SelectionChanged Even
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290 Chapter 7 MORE WINDOWS CONTROLS
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Chapter 8 Building Custom Classes C
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BUILDING THE MINIMAL CLASS you must
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The following lines will be printed
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Every time you create a new variabl
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Throw AgeException Else tAge = Valu
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Now we must do something about the
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The last two statements will print
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Note Note that the custom Equals me
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First, you must change the type of
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provide a handler for the event, th
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After this declaration, the TimerOb
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done is out of the question, so thi
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When an application initiates an op
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class’s type. If the class has al
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Note You can use the Split method o
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strNum = strNum & “ And “ & For
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openFileDialog1.ShowDialog() Consol
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Get ContactName = _contactName End
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method, so we must provide our own
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contact.EMail = txtEMail.Text conta
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So, how can we update a class that
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Original List After Elimination of
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Polymorphism This is another powerf
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If there are properties common to a
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Testing the Shape Class To test the
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Let’s start with the Triangle cla
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the month that was passed to the me
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WHO CAN INHERIT WHAT? Derived Class
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Get Property2 = “Original Propert
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Is it reasonable for a method of th
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The result of a matrix operation is
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Chapter 9 Building Custom Windows C
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ENHANCING EXISTING CONTROLS Designe
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Then save the project by selecting
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add some visual indication when a m
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Figure 9.3 The custom properties of
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Building Compound Controls A compou
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You can also specify a color value
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Building User-Drawn Controls This i
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Table 9.2: The Settings of the Effe
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The current settings of the two pro
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This subroutine calls for a few exp
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The Changed Events The UserControl
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Then, declare the following event i
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Listing 9.12: Setting Up the Two Al
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The procedures for implementing the
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The code also compares the current
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Listing 9.19: The RoundButton Contr
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ackground of each item, draw the te
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technique—for example, you can pl
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To test the enhanced ListBox contro
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Listing 9.25: Navigating to a URL w
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Chapter 10 Automating Microsoft Off
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The New keyword tells VB to create
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Objects That Represent Text The mos
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As with the Print method, the argum
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You can then apply the Range object
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of the members of the WDSelectionTy
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.Font.Size = WordApp.Selection.Font
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MsgBox(“The document contains “
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upon Word’s spell-checking routin
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Dim SpellCollection As Word.Proofre
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ListBox2.Items.Add(ListBox1.Items(w
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To access an individual worksheet,
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The Clear method resets all the cel
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Listing 10.9: Preparing a New Sprea
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Figure 10.5 This spreadsheet was cr
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to the cell, and if you read back t
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Figure 10.6 The properties of the C
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For cnt = 1 To allContacts.Items.Co
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Figure 10.8 Demonstrating how to re
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In the Messages project, you use th
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the case for users with a small num
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newNode = parentNode.Nodes.Add(subF
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Part III Basic Framework Classes In
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480 Chapter 11 STORING DATA IN COLL
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530 Chapter 12 HANDLING STRINGS, CH
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570 Chapter 13 WORKING WITH FOLDERS
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Part IV Intermediate Programming In
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620 Chapter 14 DRAWING AND PAINTING
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Chapter 15 Printing with VB.NET The
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This is same object we used in the
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dialog box was discussed in Chapter
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PrintPreviewDialog This is another
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The PrinterSettings object is a pro
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These statements will produce outpu
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e.Graphics object represents the dr
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VB.NET at Work: The PageSettings Pr
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e.Graphics.TranslateTransform(X, Y)
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X = (LMargin - strHeight) / 2 Y = T
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e.Graphics.ResetTransform() e.Graph
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each row depends on the height of t
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a line for each author. The followi
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W1 = X2 - X1 W2 = X3 - X2 W3 = page
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VB.NET at Work: The PrintText Proje
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start a new line with the last word
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on the previous page. This method i
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ectangle as possible, even if the l
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End If If PictHeight < .Height Then
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Listing 15.14: Printing a Simple Do
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SUMMARY Summary Printing is a major
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742 Chapter 16 THE TREEVIEW AND LIS
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Page 816 and 817: SUMMARY Note There are many more ad
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To make a constraint part of the da
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Alternatively, you can prefix the S
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the WHERE clause to specify how the
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names from the Customers table, you
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This statement will calculate the s
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FROM [Order Details] WHERE ProductI
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You can retrieve the same rows usin
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Limiting Groups with HAVING The HAV
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If you want to specify values for a
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operations, instead of typing compl
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If you paste this statement in the
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field in the Orders table. A new li
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dbo.Products.ProductID = dbo.[Order
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TitleAuthor, and Authors. Then chec
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This time the Query Builder will ge
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The first statement alters the proc
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Select all the text on the editor a
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it would be replaced by the second
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Chapter 21 Building Database Applic
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THE ARCHITECTURE OF ADO.NET the mod
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The first object, SqlConnection1, i
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Figure 21.2 To generate a DataSet,
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The first statement clears the curr
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to the parent table, select another
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CREATING A DATASET By default, the
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on the Data Adapter Configuration W
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Listing 21.1: Populating a DataSet
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and the Tag property to the table
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The PositionChanged() subroutine di
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and rename it to LookupCustomers. T
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DataSet. You can select a few field
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Listing 21.8: Navigating via the Li
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PROGRAMMING THE DATAADAPTER OBJECT
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Listing 21.9: Selecting Customer’
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THE COMMAND AND DATAREADER OBJECTS
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at all, and it’s certainly more e
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While SQLReader.Read txtOrders.Text
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964 Chapter 22 PROGRAMMING THE ADO.
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VB.NET on the Web Part VI In this s
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1000 Chapter 23 INTRODUCTION TO WEB
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1048 Chapter 24 ACCESSING DATA ON T
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Chapter 25 XML Web Services The las
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Building a Web Service In all previ
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The two methods are hyperlinks. Cli
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As you can see, each Web service is
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that appears (Figure 25.5), enter t
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original error message is embedded
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This is a good point to change the
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Figure 25.11 Binding a DataGrid Web
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