Lecture Windows programming: Chapter 3(2) - Châu Thị Bảo Hà

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Chapter 3 (Cont’d) introduction to the Windows programming. In this chapter present the some common controls as: Button; label, LinkLabel; TextBox ( + ErrorProvider component), RichTextBox; GroupBox, panel; CheckBox, RadioButton; PictureBox, ImageList;... Inviting you to refer.

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Nội dung Text: Lecture Windows programming: Chapter 3(2) - Châu Thị Bảo Hà

Chapter 3 Windows Programming Cont’d 1
Contents • Introduction to Windows Form Application • Introduction to Form • Introduction to Control • Events • Some common Controls • Some advanced Controls Slide 2
Naming rules • Each control has an identifier (Name property) – can contain letters, digits, and underscores (_) – cannot start with digits – can start with the @ symbol – no spaces or punctuation marks • If multiple words capitalize 1st letter of each word • 3 letter lowercase prefix identifies control type Slide 3
Recommended naming Object Class Prefix Example Form frm frmDataEntry Button btn btnExit TextBox txt txtPaymentAmount Label lbl lblTotal RadioButton rad radBold CheckBox chk chkPrintSummary PictureBox pic picLandscape ComboBox cbo cboBookList ListBox lst lstIndegredients GroupBox grb grbColor Slide 4
Some common Controls 1. Button 2. Label, LinkLabel 3. TextBox ( + ErrorProvider component), RichTextBox 4. GroupBox, Panel 5. CheckBox, RadioButton 6. PictureBox, ImageList 7. ListBox, CheckedListBox 8. ComboBox Slide 5
Button (p.453) • Allows the user to click it to perform an action – some properties: • FlatStyle • Image • ImageAlign • Text • TextAlign – default event: • Click event: happens whenever a user clicks the button Slide 6
Label (p.456) • To display text or images that cannot be edited by the user – some properties: • AutoSize • BorderStyle • Font • Image • ImageAlign • Text • TextAlign Slide 7
LinkLabel (p.456) • To add Web-style links to applications – some properties: • ActiveLinkColor • LinkArea • LinkColor • LinkVisited • VisitedLinkColor Slide 8
TextBox (p.457) • To enter text or display information – some properties: • CausesValidation: true/false • CharacterCasing: Normal/Upper/Lower • MaxLength • Multiline: true/false • PasswordChar • ReadOnly: true/false • ScrollBars • WordWrap: true/false Slide 9
TextBox (cont.) – some events: • TextChanged • Enter • Leave These events occur in this order • Validating • Validated KeyDown and KeyUp receive the key code • KeyDown corresponding to the key that was pressed. KeyPress receives the character corresponding to a • KeyPress keyboard key. • KeyUp • Try it out - Working with a TextBox Slide Control 10
The ErrorProvider component • You can display an error to alert the user about invalid data input by using ErrorProvider component • BlinkRate property • BlinkStyle property • ContainerControl property • GetError() method • Icon property • SetError() method • SetIconAlignment() method • SetIconPadding() method Slide 11
Demo: Validating and Validated event • Example: private void txtNumber1_Validating(object sender, CancelEventArgs e) { if (Convert.ToInt32(txtNumber1.Text) < 0) { e.Cancel = true; // cancel the event errorProvider1.SetError(txtNumber1, “this is not a valid number"); txtNumber1.SelectAll(); } }private void txtNumber1_Validated(object sender, EventArgs e) { errorProvider1.SetError(txtNumber1, ""); Slide 12
Demo: Validating and Validated event Slide 13
Demo: KeyPress event Slide 14
RichTextBox (p.470) • Used for displaying, entering, and manipulating text with more formatting (display fonts, colors, and links; load text and embedded images from a file; undo and redo editing operations; and find specified characters) – some properties (p.471): • SelectedText • SelectionAlignment • SelectionColor • SelectionFont Slide 15
GroupBox, Panel • Arrange components on a GUI – GroupBox can display a caption (p.466) • Text property: determines its caption – Panel can have scrollbar • AutoScroll property • BorderStyle property Slide 16
RadioButton • RadioButton (p.465): – is used to give users a choice between two or more mutually exclusive options – use a GroupBox control or some other container to group radio buttons together • if radio buttons are placed within a form, Slide 17
RadioButton (cont.) – some properties: • Appearance: Normal/Button • AutoCheck: When false, the radio button must be manually checked in code from the Click event handler • Checked: True/False • CheckAlign – some events: • CheckedChanged: occurs when the check of the RadioButton changes (default) • Click: occurs every time the RadioButton is clicked Slide 18
CheckBox • CheckBox (p.466) – is used to enable users to choose one or more options – a check box can have three states: Checked, Indeterminate and Unchecked – some properties: • CheckState: Checked/Indeterminate/Unchecked • Checked: True/False • ThreeState: When false, the user will not be able to change the CheckState state Try to Indeterminate it out p.467 (except by coding) Slide 19
PictureBox • To display graphics in bitmap, GIF, JPEG, metafile, or icon format – Image property – SizeMode property – Click event • To load image from file by coding, using: – pictureBox1.Image = Image.FromFile("path"); Example: pictureBox1.Image = Image.FromFile("d:\\Hinh\\myPic.jpg"); • Slide 20