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148 Day 5 TIP You can center components visually, but for a more exact method you can use the Alignment Palette. Choose View | Alignment Palette from the main menu and then click the Center horizontally in window button on the Alignment Palette to center a component horizontally on the form. We will use this button to alternately show and hide the memo component. Now we need to write some code so that the button does something when clicked. Be sure the button component is selected and then click on the Events tab in the Object Inspector. A list of the events that a button component is designed to handle is presented. The top event should be the OnClick event. Double-click on the value column of the OnClick event. What happens next is one of the great things about visual programming. The Code Editor comes to the top and displays the OnClick function, ready for you to type code. Figure 5.3 shows the Code Editor with the OnClick handler displayed. Figure 5.3. The C++Builder Code Editor with the OnClick handler displayed. NOTE This function looks like the class member functions I discussed on Day 3 and, in fact, that’s exactly what it is. The only difference is that C++Builder functions use the __fastcall keyword (note that two
C++ Class Frameworks and the Visual Component Model underscores proceed the fastcall keyword). It’s not important that you understand what __fastcall does, but just that every C++Builder function uses this calling convention. You’ll probably want to make the Code Editor window a little wider so you can see all of the text that is displayed. Before you go on, save the project. Choose File | Save from the main menu. The first thing you are prompted for is the name of the unit (source file). Type PMEMain and click OK. Next you are prompted for a filename for the project. Type PMETest and press Enter or click OK. Now on to the good stuff…. Notice that the function is already set up for you and all you have to do is type the code. If you take a good look at the function, you will see that the function is called ButtonClick, that it is a member function of the TPMEForm class, that it returns void, and that it takes a pointer to a TObject called Sender as a parameter. (I’ll talk about the Sender parameter in just a bit.) All that is left to do now is type code that alternately shows or hides the button each time the button is clicked. We’ll borrow a little code from our earlier discussion of methods. Edit the ButtonClick function until it looks like this: void __fastcall TPMEForm::ButtonClick(TObject *Sender) { static bool isVisible; isVisible = !isVisible; if (isVisible) Memo->Hide(); else Memo->Show(); } This code sets up a static variable named isVisible. NEW TERM A static variable is one that retains its value between function calls. Static variables are the exception to the rule regarding uninitialized variables—static variables are initially set to 0. In this case, isVisible is a bool variable, so it is initially set to false. The second line of code in this function flips the bool variable between true and false by applying a logical NOT to the present value of the variable. It works like this: Initially the static variable is set to false. The first time the function executes, the variable is assigned NOT false, which is, of course, true. The next time the function executes, the variable is assigned NOT true, and so on. So each time the function executes, isVisible contains the opposite value it had on the previous function call. After that, the if/else pair calls either Show() or Hide() depending on the value of isVisible. 149 5
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At a Glance At A Glance WEEK 1 In W
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Day 1 Getting Your Feet Wet Week Ge
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Getting Your Feet Wet are divided i
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NOTE Getting Your Feet Wet As you m
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Getting Your Feet Wet but you need
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NOTE Getting Your Feet Wet In order
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NOTE Getting Your Feet Wet In C++,
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Getting Your Feet Wet An object, li
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Getting Your Feet Wet In some progr
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Listing 1.3. WRAPME.CPP. Getting Yo
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Getting Your Feet Wet Operator Desc
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NEW TERM Figure 1.5. Anatomy of a f
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SYNTAX ▼ ▲ Getting Your Feet We
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Getting Your Feet Wet Let’s prove
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Getting Your Feet Wet There is a sh
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Getting Your Feet Wet When the prog
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NOTE Function Description Getting Y
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NOTE Getting Your Feet Wet numbers
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Quiz Getting Your Feet Wet Windows
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Day 2 Wading In Deeper Wading In De
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NOTE Wading In Deeper If the condit
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SYNTAX ▼ ▼ TIP TIP Wading In De
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SYNTAX Wading In Deeper immediately
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Listing 2.1. FORLOOP.CPP. Wading In
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SYNTAX ▼ ▲ SYNTAX ▼ ▲ The w
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Wading In Deeper for (int i=0;i
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▲ default: dflt_statements; break
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Wading In Deeper This code generate
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NOTE Wading In Deeper You can creat
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Wading In Deeper So how do the sour
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Wading In Deeper 20: sizeof(listArr
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NOTE Wading In Deeper The displayRe
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Workshop Wading In Deeper The Works
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Day 3 Up to Your Neck in C++ Up to
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Up to Your Neck in C++ In this case
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Up to Your Neck in C++ Figure 3.1.
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Up to Your Neck in C++ That won’t
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Up to Your Neck in C++ 42: cin.getl
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Listing 3.2. REFERENC.CPP. Up to Yo
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Up to Your Neck in C++ Although it
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NOTE Up to Your Neck in C++ Now you
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Up to Your Neck in C++ If you are a
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NOTE Up to Your Neck in C++ If you
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NOTE NOTE Up to Your Neck in C++ ca
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Up to Your Neck in C++ Now the comp
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NOTE Up to Your Neck in C++ int Air
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Quiz Up to Your Neck in C++ Day 5,
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Totally Immersed: C++ Classes and O
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The C++Builder IDE Explored: Projec
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NOTE The C++Builder IDE Explored: P
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Figure 6.18. The About box for the
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Figure 6.20. The Project Options di
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Quiz The C++Builder IDE Explored: P
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Working with the Form Designer and
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NOTE Working with the Form Designer
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NOTE TIP TIP Working with the Form
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NOTE Figure 7.10. The Alignment Pal
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Quiz Working with the Form Designer
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In Review In Review WEEK 1 You cove
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In Review displayed based on user i
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At a Glance At A Glance WEEK 2 Are
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Day 8 VCL Components VCL Components
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VCL Components C++Builder displays
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VCL Components Important Common Pro
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Cursors VCL Components The Cursor p
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Figure 8.2. The Object Inspector sh
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VCL Components You can set this pro
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VCL Components Method Description I
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VCL Components Similarly, when the
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NOTE TIP VCL Components There may b
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VCL Components or load the Memo wit
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VCL Components Item Applies To Desc
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VCL Components You can use owner-dr
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VCL Components Property Applies To
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VCL Components for buttons that are
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VCL Components property set to true
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NOTE VCL Components To set the glyp
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VCL Components The GroupIndex Prope
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NOTE VCL Components form. Like the
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VCL Components As such, they go wit
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VCL Components The File Open and Fi
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VCL Components The InitialDir Prope
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VCL Components The Font dialog box
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Quiz VCL Components Q I’m respond
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Day 9 Creating Applications in C++B
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Figure 9.1. The Object Repository w
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Creating Applications in C++Builder
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TIP Creating Applications in C++Bui
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NOTE NOTE Creating Applications in
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Figure 9.4. The Object Repository c
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NOTE Creating Applications in C++Bu
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TIP Creating Applications in C++Bui
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Summary Creating Applications in C+
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More on Projects Day 10 More on Pro
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More on Projects The only time this
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TIP More on Projects You can add mo
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More on Projects Table 10.1. The Pr
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Figure 10.6. The Project Explorer s
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■ Forms ■ Application ■ C++
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NOTE NOTE More on Projects if (!Abo
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Figure 10.9. The C++ page of the Pr
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NOTE TIP More on Projects To avoid
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NOTE More on Projects Compiler and
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More on Projects The Show warnings
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More on Projects The C++Builder Cod
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NOTE More on Projects If you open a
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More on Projects menu or press Ctrl
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Figure 10.13. The Code Editor with
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More on Projects find a matching br
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More on Projects The Editor Page Th
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NOTE More on Projects I usually get
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Quiz More on Projects Q When I star
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More on Projects 8. Continuing with
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Using the Debugger Day 11 Using the
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Using the Debugger Item Shortcut De
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NOTE Using the Debugger is highligh
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NOTE Using the Debugger any conditi
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Using the Debugger Conditional Brea
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Using the Debugger The variable nam
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Using the Debugger The fastest way
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Using the Debugger The Watch List i
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NOTE Using the Debugger When you us
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NOTE Using the Debugger The Methods
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NOTE Using the Debugger in the Eval
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CPU View Using the Debugger The CPU
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NOTE Using the Debugger builds. Rem
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Using the Debugger macros, TRACE an
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Using the Debugger The diagnostic m
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Using the Debugger ■ Ordinarily y
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Quiz Using the Debugger 1. How do y
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C++Builder Database Architecture Da
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C++Builder Database Architecture Te
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C++Builder Database Architecture an
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C++Builder Database Architecture
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C++Builder Database Architecture Pr
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C++Builder Database Architecture Th
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C++Builder Database Architecture To
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Event Catalyst C++Builder Database
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WARNING C++Builder Database Archite
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C++Builder Database Architecture Lo
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C++Builder Database Architecture A
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C++Builder Database Architecture da
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Method Function C++Builder Database
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C++Builder Database Architecture St
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C++Builder Database Architecture Ta
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C++Builder Database Architecture Ta
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C++Builder Database Architecture Up
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C++Builder Database Architecture Ke
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TIP C++Builder Database Architectur
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Building Internet Applications Day
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Building Internet Applications Tabl
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Building Internet Applications prop
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Building Internet Applications Noti
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Building Internet Applications 20:
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Building Internet Applications 65:
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Quiz Building Internet Applications
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C++Builder Extensions to C++ Day 14
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C++Builder Extensions to C++ compil
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C++Builder Extensions to C++ Anothe
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C++Builder Extensions to C++ __int8
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C++Builder Extensions to C++ value
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C++Builder Extensions to C++ you ca
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In Review In Review WEEK 2 Wow, tha
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Answers to Quiz Questions APPENDIX
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Day 3 Day 4 Answers to Quiz Questio
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Answers to Quiz Questions 4. Hold d
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Day 10 Answers to Quiz Questions 1.
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Symbols & (ampersands), 246 © (cop
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C C (programming language), 132 C c
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File Save, 309-312 Find/Replace, 31
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Insert Template, 248 Object Reposit
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Cascade( ), 198 Close( ), 198 Close
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Layout property (BitBtn component),
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object-oriented programming, see OO
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protected member functions, 106 pro
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structures arrays, 58 C vs. C++, 64
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A V I A C O M S E R V I C E The Inf
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Component Palette Quick Reference S
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Add to Your Sams Library Today with
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Overview Introduction Introduction
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Introduction VCL Explored .........
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