Programming Based on Events

1. 10 Programming Based on Events C# Programming: From Problem Analysis to Program Design 3rd Edition C# Programming: From Problem Analysis to Program Design

2. Part II C# Programming: From Problem Analysis to Program Design

3. MenuStrip Controls • Offers advantage of taking up minimal space • Drag and drop MenuStrip object from toolbox to your form • Icon representing MenuStrip placed in Component Tray • Select MenuStrip objectto set its properties • To add the text for a menu option, select the MenuStrip icon and then click in the upper-left corner of the form C# Programming: From Problem Analysis to Program Design

4. Adding Menus Drag MenuStrip control to form, then click here to display Menu structure Figure 10-9 First step to creating a menu C# Programming: From Problem Analysis to Program Design

5. MenuStrip Control Objects • Ampersand (&) is typed between the F and o for the Format option to make Alt+o shortcut for Format Figure 10-10 Creating a shortcut for a menu item C# Programming: From Problem Analysis to Program Design

6. MenuStrip Control Objects (continued) • To create separators, right-click on the text label (below the needed separator) • Select Insert Separator Figure 10-11 Adding a separator C# Programming: From Problem Analysis to Program Design

7. MenuStrip Control Objects (continued) Set the text to be displayed when the cursor is rested on top of the control Figure 10-12 Setting the Property for the ToolTip control C# Programming: From Problem Analysis to Program Design

8. Wire Methods to Menu Option Event • Set the Name property for each menu option • Do this first, then wire the event • Click events are registered by double-clicking on the Menu option • When the menu option is clicked, the event triggers, happens, or is fired C# Programming: From Problem Analysis to Program Design

9. Adding Predefined Standard Windows Dialog Boxes • Included as part of .NET • Dialog boxes that look like standard Windows dialog boxes • File Open, File Save, File Print, and File Print Preview • Format Font • Format Color dialogs C# Programming: From Problem Analysis to Program Design

10. Adding Predefined Standard Windows Dialog Boxes– Color Retrieves the current ForeColor property setting for the Label object privatevoid menuColor_Click(object sender, System.EventArgs e) { colorDialog1.Color = lblOutput.ForeColor; if (colorDialog1.ShowDialog( ) != DialogResult.Cancel ) { lblOutput.ForeColor = colorDialog1.Color; } } Checks to see if Cancel button clicked Set to selection made C# Programming: From Problem Analysis to Program Design

11. Adding Predefined Standard Windows Dialog Boxes– Color (continued) Figure 10-14 Color dialog box menu option C# Programming: From Problem Analysis to Program Design

12. Adding Predefined Standard Windows Dialog Boxes– Font privatevoid menuFont_Click (object sender, System.EventArgs e) { fontDialog1.Font = lblOutput.Font; if (fontDialog1.ShowDialog( ) != DialogResult.Cancel ) { lblOutput.Font = fontDialog1.Font ; } } Figure 10-15 Font dialog box menu option C# Programming: From Problem Analysis to Program Design

13. CheckBox Objects • Appear as small boxes • Allow users to make a yes/no or true/false selection • Checked property set to either true or false depending on whether a check mark appears or not • Default false value • CheckChanged( )– default event-handler method • Fired when CheckBox object states change • Can wire one event handler to multiple objects C# Programming: From Problem Analysis to Program Design

14. Wiring One Event Handler to Multiple Objects • Using Properties window, click on the Events Icon • Click the down arrow associated with that event • Select method to handle the event • Follow the same steps for other objects C# Programming: From Problem Analysis to Program Design

15. Wiring One Event Handler to Multiple Objects (continued) Figure 10-16 Wiring the event-handler method C# Programming: From Problem Analysis to Program Design

16. CheckBox Object Figure 10-17 ComputeCost_CheckedChanged( ) method raised C# Programming: From Problem Analysis to Program Design

17. GroupBox Objects • CheckBox objects may be grouped together for visual appearance • Can move or set properties that impact the entire group • A GroupBox control should be placed on the form before you add objects • GroupBox control adds functionality to RadioButton objects • Allow only one selection C# Programming: From Problem Analysis to Program Design

18. RadioButton Objects • Appear as small circles • Give users a choice between two or more options • Not appropriate to select more than one CheckBox objectwith RadioButton objects • Group RadioButton objects by placing them on a Panel or GroupBox control • Setting the Text property for the GroupBox adds a labeled heading over the group C# Programming: From Problem Analysis to Program Design

19. Adding RadioButton Objects Figure 10-18 GroupBox and RadioButton objects added C# Programming: From Problem Analysis to Program Design

20. RadioButton Objects (continued) • Turn selection on this.radInterm.Checked = true; • Raise a number of events, including Click( ) and CheckedChanged( ) events • Wire the event-handler methods for RadioButton objects, just like CheckBox C# Programming: From Problem Analysis to Program Design

21. Registering RadioButton Object Events • Register ComputeCost_CheckedChanged( ) method Figure 10-19 Wired Click event C# Programming: From Problem Analysis to Program Design

22. RadioButton Objects (continued) • ComputeCost_CheckedChanged( ) method if (this.radBeginner.Checked) { cost +=10; this.lblMsg.Text = "Beginner “ + “-- Extra $10 charge"; } else // more statements C# Programming: From Problem Analysis to Program Design

23. ComputeCost_CheckChanged( ) and Click( ) Events Raised Figure 10-20 ComputeCost_CheckedChanged( ) and Click( ) events raised C# Programming: From Problem Analysis to Program Design

24. Windows Presentation Foundation • WPF • Interface for Visual Studio 2010 was built using WPF • Vector-based and resolution-independent ->sharp graphics • As with WinForms, drag and drop controls from the Toolbox onto the window C# Programming: From Problem Analysis to Program Design

25. Windows Presentation Foundation (WPF) Figure 10-19 WPF design C# Programming: From Problem Analysis to Program Design

26. TabControl Controls • Sometime an application requires too many controls for a single screen • TabControl objectdisplays multiple tabs, like dividers in a notebook • Each separate tab can be clicked to display other options • Add a TabControl objectto the page by dragging the control from the Containersection of the Toolbox C# Programming: From Problem Analysis to Program Design

27. TabControl Controls (continued) Figure 10-21 Tabbed controlled application C# Programming: From Problem Analysis to Program Design

28. TabControl Controls (continued) Figure 10-22 TabControl object stretched to fill form C# Programming: From Problem Analysis to Program Design

29. TabControl Controls (continued) • TabPage property enables you to format individual tabs • Clicking the ellipsis beside the Collection value displays the TabPage Collection Editor Figure 10-23 TabControl's TabPage Collection Editor C# Programming: From Problem Analysis to Program Design

30. DinerGui Application Example Figure 10-24 Problem specification for DinerGUI example C# Programming: From Problem Analysis to Program Design

31. DinerGui Application Example (continued) C# Programming: From Problem Analysis to Program Design

32. DinerGui Application Example (continued) Figure 10-25 Prototype for DinerGUI example C# Programming: From Problem Analysis to Program Design

33. DinerGui Application Example (continued) Figure 10-26 Class diagrams C# Programming: From Problem Analysis to Program Design

34. DinerGui Application Example (continued) Figure 10-33 Message displayed from Current Order menu option C# Programming: From Problem Analysis to Program Design

35. Coding Standards • Follow a consistent naming standard for controls • Before you register events, such as button click events, name the associated control C# Programming: From Problem Analysis to Program Design

36. Chapter Summary • Delegates • Event-handling procedures • Registering an event • ListBox control for multiple selections • ComboBox versus ListBox objects C# Programming: From Problem Analysis to Program Design

37. Chapter Summary (continued) • Adding controls to save space • MenuStrip controls • TabControl • Use of GroupBox controls • RadioButton versus CheckBox objects C# Programming: From Problem Analysis to Program Design