Mastering Visual Basic .NET

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768 Chapter 16 THE TREEVIEW AND LISTVIEW CONTROLS is positive, then we scan all the items of the Node.Nodes collection. To do this, the ScanNode() subroutine must call itself by passing a different argument. If you’re familiar with recursive procedures, you’ll find the code quite simple. If not, this coding probably will raise many questions. You can use the ScanNode() subroutine as is to scan any TreeView control. All you need is a reference to the root node (or the node you want to scan recursively), which you must pass to the ScanNode() subroutine as an argument. The subroutine will scan the entire subtree and display its nodes on a ListBox control. The nodes will be printed one after the other. To make the list easier to read, indent the names of the nodes by an amount that’s proportional to the levels of nesting. Nodes of the first level aren’t indented at all. Nodes on the first level can be indented by 5 spaces, nodes on the second level can be indented by 10 spaces, and so on. The variable IndentLevel keeps track of the level of nesting and is used to specify the indentation of the corresponding node. It’s increased by 5 when we start scanning a new subordinate node and decreased by the same amount when we return to the next level up. The IndentLevel variable is declared as Static so that it maintains its value between calls. Run the TreeViewScan project and expand all nodes. Then click the Scan Tree button to populate the list on the right with the names of the continents/countries/cities. Obviously, the ListBox control is not a substitute for the TreeView control. The data have no particular structure; even when they’re indented, there are no tree lines connecting its nodes, and users can’t expand and collapse the control’s contents. So why bother to map the contents of the TreeView control to a ListBox control? The goal was to demonstrate how to scan a tree structure and extract all the nodes along with their structure. You can use the ScanNode() subroutine to store the nodes of a TreeView control to a disk file or transfer them to a database or another control. The ScanNode() subroutine is the core of the subroutine you need and can be adjusted to accommodate any of the operations just mentioned. The ListView Control The ListView control is similar to the ListBox control except that it can display its items in many forms, along with any number of subitems for each item. To use the ListView control in your project, place an instance of the control on a form and then sets its basic properties, which are described in the following sections. The View and Arrange properties There are two properties that determine how the various items will be displayed on the control: the View property, which determines how the items will appear, and the Arrange property, which determines how the items will be aligned on the control’s surface. The View property can have one of the values shown in Table 16.1. Table 16.1: Settings of the View Property Setting Description LargeIcon (Default) Each item is represented by an icon and a caption below the icon. SmallIcon Each item is represented by a small icon and a caption that appears to the right of the icon. List Each item is represented by a caption. Report Each item is displayed in a column with its subitems in adjacent columns.
The Arrange property determines how the items will be arranged on the control, and its possible settings are show in Table 16.2. Table 16.2: Settings of the Arrange Property Setting Description Default When an item is moved on the control, it remains where it is dropped. Left Items are aligned to the left side of the control. SnapToGrid Items are aligned to an invisible grid on the control. When the user moves an item, the item moves to the closest grid point on the control. Top Items are aligned to the top of the control. HeaderStyle This property determines the style of the headers in Report view. It has no meaning when the View property is set to something else, because only the Report view has columns. The possible settings for the HeaderStyle property are shown in Table 16.3. Table 16.3: Settings of the HeaderStyle Property Setting Description Clickable Visible column header that responds to clicking Nonclickable Visible column header that does not respond to clicking None No visible column header AllowColumnReorder This property is a True/False value that determines whether the user can reorder the columns at runtime. If this property is set to True, then the user can move a column to a new location by dragging its header with the mouse and dropping it in the place of another column. This property is also meaningful only in Report view. Activation This property specifies the action that will activate an item on the control, and it can have one of the values shown in Table 16.4. Table 16.4: Settings of the Activation Property Setting Description OneClick Items are activated with a single click. When the cursor is over an item, it changes shape and the color of the item’s text changes. Standard Items are activated with a double-click. No change in the selected item’s text color takes place. TwoClick Items are activated with a double-click and their text changes color as well. THE LISTVIEW CONTROL 769
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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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820 Chapter 18 RECURSIVE PROGRAMMIN
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Chapter 19 The Multiple Document In
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MDI APPLICATIONS: THE BASICS of the
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New command. Before we can open a c
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The other four options of the Windo
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and ends with a separator. The top
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Figure 19.5 The parent menu (top le
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To access the contents of a TextBox
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Programming the New Command The New
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Listing 19.6: The Save Command Priv
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If Me.ActiveMdiChild Is Nothing The
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ttnFindNext.Enabled = True bttnRepl
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may have to maintain a list of True
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2. Rename the form to MDIImage and
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The code resizes the PictureBox con
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SUMMARY Summary In this, the last c
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Chapter 20 Databases: Architecture
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how to extract data from your datab
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Suppliers Table Each product has a
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WHAT IS A DATABASE? Exploring the P
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WHAT IS A DATABASE? is the foreign
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(basically, the driver you’ll use
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Figure 20.7 Editing the Customers t
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THE SERVER EXPLORER in the U.S., yo
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THE SERVER EXPLORER Enforce relatio
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THE SERVER EXPLORER Indexes/Keys Ta
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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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