week 2 basic windows programming

8/7/2019 Week 2 Basic Windows Programming

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Week 2:

WINDOWS PROGRAMMING

Chapter 15 in Beginning Visual C# 2010 ebook

Chapter 4 in MCTS_Self-Paced_Training_Kit

ebook

Week 2:

WINDOWS PROGRAMMING

Working with Windows Forms

CONTROLS

When you work with Windows Forms, youare working with the

System.Windows.Forms namespace

Most controls in .NET derive from theSystem.Windows.Forms.Controlclass

Many of these classes are themselves baseclasses for other controls, as is the case with

the Label and TextBoxBase classes

Windows Programming 1 Basic Windows Programming Slide 3


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CONTROLS


PropertiesCommon Control Class Properties


PropertiesCommon Control Class Properties



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Adding Controls to a Windows

Form

Adding Controls by Using the WindowsForms Designer

Adding Controls Programmatically


Adding Controls

Programmatically

1. Create a private variable to represent eachof the controls you want to place on the form

2. In the form, place code to instantiate each

control and to customize each control, using

its properties, methods, or events.

3. Add each control to the forms control

collection.


Exam (page 113)



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Handling Control Events Add controls to a Windows form.

Set properties on controls.

Load controls dynamically. Write code to handle control events and add the code

to a control.


Handling Control Events_Ex


HANDLING CONTROL EVENTS



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HANDLING CONTROL EVENTS


COMMON WINDOWS FORMS

CONTROLS

Control DescriptionLabel An area in which icons or uneditable text can be

displayed.

TextBox An area in which the user inputs da ta from the keyboard.The area also can display information.

Button An area that triggers an event when clicked.

CheckBox A GUI control that is either selected or not selected.

ComboBox A drop-down list of items from which the user can makea selection, by clicking an i tem in the list or by typinginto the box, if permitted.

ListBox An area in which a list of items is displayed from whichthe user can make a selection by cli cking once on any

element. Multiple elements can be selected.

Panel A container in which components can be placed.

ScrollBar Allows the user to access a range of values that cannotnormally fit in its container.


Naming Rules

Always use standard names for objects

No spaces or punctuation marks

3 letter lowercase prefix identifies control type

Button-btn

Label-lbl

Form-frm

If multiple words capitalize 1st letter of each word

Each object name is an identifier

Can contain letters, digits, and underscores (_)

Cannot start with digits

Can start with the at symbol (@)



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Recommended Naming

Object Class Pref ix Example

Form frm frmDataEntry

Button btn btnExit

TextBox txt txtPaymentAmount

Label lbl lblTotal

Radio Button rad radBold

CheckBox chk chkPrintSummary

PictureBox pic picLandscape

ComboBox cbo cboBookList

ListBox lst lstIndegredients

GroupBox grb grbColor


Windows Forms

Windows Forms is the basic building block ofthe UI

It provides a container that hosts controls and

menus and enables you to present an

application in a familiar and consistent

fashion

You can add and configure additional formsat design time, or you can create instances of

predesigned forms in code at run time.


Windows Forms

Some Properties of the Form Class



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Windows Forms



Windows Forms



Setting the Title of the Form

To change the title of a form at run time, setthe Text property of the form in code, as

shown in the following code:



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Setting the Border Style of the

Form


Specifying the Startup Location of

the Form


Keeping a Form on Top of the

User Interface

TopMost = True

FormBorderStyle = False;

StartPosition = CenterToScreen;



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Opacity and Transparency in

Forms

The Opacityproperty to create striking visualeffects in your form

Values between 0 percent and 100 percent

result in a partially transparent form


Setting the Startup Form

1. In Solution Explorer, double-click

Program.cs to view the code. The code

window opens.

2. Locate the Main method and then locatethe line that reads:

Application.Run(new Form());

where Form represents the name of the

form that is currently the startup form.

3. Change Form to the name of the form you

want to set as the startup form.


Control Properties and Layout

Common properties

Derive from class Control

Text property

Specifies the text that appears on a control

Focus method

Transfers the focus to a control

Becomes active control

Enable property

Indicate a controls accessibility



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Visibility control

Hide control from user

Anchor property

Anchoring control to specific location (corner)

Unanchored control moves relative to the position

Docking allows control to spread itself along and

entire side

Both options refer to the parent container



Fig. 12.11 Anchoring demonstration.

Constant distance

to left and top sides

Before resize After resize



Fig. 12.12 Manipulating the Anchorproperty of a control.

Darkened bar indicates

to which wall control

is anchored

Click down-arrow

in Anchor property

to display

anchoring window



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Fig. 12.13 Docking demonstration.

Control expands along

top portion of the form



Common Layout Properties Description

Common Properties

Anchor Side of parent container at which to anchor control

values can be combined, such as Top,Left.

Dock Side of parent container to dock controlvalues cannot

be combined.

Location Location of the upper-left corner of the control, relative to

its container.

Size Size of the control. Takes a Size structure, which has

properties Height andWidth.

MinimumSize,

MaximumSize (for

Windows Forms)

The minimum and maximum size of the form.

Fig. 12.14 ClassControl layout properties.


Week 2:

WINDOWS PROGRAMMING

Controls for displaying

information to the user


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Labels and LinkLabel controls

Labels : The standard Windows label

LinkLabel: A label similar to the standard one

but that presents itself as an Internet link (ahyperlink)

You dont need to add event handling code for a

standard Label

Some extra code is needed to enable users clicking i t to

go to the target of the LinkLabel


Common Label Control Properties


Common Label Control Properties



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Week 2:

WINDOWS PROGRAMMING

Controls that enable users of

your application to enter text,

TextBoxes and RichTextBox

The .NET Framework comes with two basiccontrols to take text input from users:

TextBox and RichTextBox.

Both controls are derived from a base class called

TextBoxBase, which itself is derived from Control.


Common TextBox Control

Properties



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Common TextBox Control

Properties


THE RICHTEXTBOX CONTROL

Like the normal TextBox, the RichTextBoxcontrol is derived from TextBoxBase

Whereas a TextBox is commonly used for the

purpose of obtaining short text strings from

the user

The RichTextBox is used to display and enter

formatted text (e.g., bold, underline, and

italic). It does so using a standard for

formatted text called Rich Text Format, or

RTF.Windows Programming 1 Basic Windows Programming Slide 41

Common RichTextBox Control

Properties



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Common RichTextBox Control

Properties


Week 2:

WINDOWS PROGRAMMING

Controls for displaying pictures

The PictureBox Control

The PictureBox control is the basic controlused for displaying images in the user

interface, and it can display pictures in avariety of formats, including .bmp, .jpg, .gif,

metafiles, and icons.



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week 2 basic windows programming

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