Advanced Topics in Windows Forms in Visual Studio .NET

Creation QR-Code in Visual Studio .NET Advanced Topics in Windows Forms

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Advanced Topics in Windows Forms
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8. Add a second form to the project. 9. In Form1, double-click AddChildFormToolStripMenuItem to open the default event handler for its Click event. 10. In the Code Editor, outside of any method, add the following line of code:
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' VB Dim Forms As Integer // C# int forms;
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11. In the AddChildFormToolStripMenuItem_Click event handler, add the following code:
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' VB forms += 1
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Dim aform As New Form2
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aform.MdiParent = Me
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aform.Text = "Form copy " & Forms.ToString
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aform.Show()
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// C# forms++;
Form2 aform = new Form2();
aform.MdiParent = this;
aform.Text = "Form copy " + forms.ToString();
aform.Show();
12. Double-click CascadeToolStripMenuItem to open the default Click event han dler for this item. Add the following code:
' VB Me.LayoutMdi(MdiLayout.Cascade) // C# this.LayoutMdi(MdiLayout.Cascade);
13. Double-click HorizontalToolStripMenuItem to open the default Click event han dler for this item. Add the following code:
' VB Me.LayoutMdi(MdiLayout.TileHorizontal) // C# this.LayoutMdi(MdiLayout.TileHorizontal);
14. Double-click VerticalToolStripMenuItem to open the default Click event handler for this item. Add the following code:
' VB Me.LayoutMdi(MdiLayout.TileVertical)
Lesson 3: Implementing MDI Forms
// C# this.LayoutMdi(MdiLayout.TileVertical);
15. Press F5 to build and run the application. Add new child forms by selecting the Add Child Form menu item. After you have added several, arrange them by choosing an option from the Arrange menu. Note that as new windows are added, they are automatically added to the Windows menu and can be brought to the front by selecting the appropriate menu item.
Lesson Summary
MDI applications follow a parent/child form model. A parent form contains and organizes multiple child forms. You can create a parent form by setting the Form.IsMdiContainer property to True. MDI child forms are created by assigning the MdiParent property to an appropriate MDI parent form. The MDI parent form exposes methods and properties that enable the organiza tion of its contained child forms. A reference to the active child form can be retrieved by using the ActiveMDIChild property of the parent form. Child forms can be arranged in the parent form by using the LayoutMdi method of the parent form. You can create a menu list of the current MDI child forms by setting the MdiWin dowListItem property of a MenuStrip control to a top-level ToolStripMenuItem. At run time, the menu will automatically be populated with the active child forms.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each choice is right or wrong are located in the Answers section at the end of the book.
1. Which of the following is necessary to create an MDI child form and host it in a parent form (Choose all that apply.) A. Set the IsMdiParent property of the parent form to True. B. Set the ActiveMdiForm property of the parent form to the child form. C. Set the MdiParent property of the child form to the parent form.
11
Advanced Topics in Windows Forms
D. Set the MdiWindowListItem property of the MenuStrip control on the parent form to an appropriate ToolStripMenuItem. 2. Which of the following lines of code can be used to obtain a reference to the active MDI child form A.
' VB Me.ActivateMdiChild(activeForm) // C# this.ActivateMdiChild(activeForm);
' VB Me.AddOwnedForm(activeForm) // C# this.AddOwnedForm(activeForm);
' VB activeForm.IsMdiChild // C# activeForm.IsMdiChild;
' VB Me.ActiveMdiChild // C# this.ActiveMdiChild;
11 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involv ing the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
The drag-and-drop operation is initiated by calling the DoDragDrop method on the source control. The DoDragDrop method takes two parameters: an Object parameter that contains the data to be dragged and dropped and a DragDropEf fects enumeration parameter that represents the effect or effects that are allowed for this operation. The DragEnter event on the target control is used to set the allowed effects for the target control. The drag-and-drop operation is completed in the DragDrop event on the target control. You must write code to complete the appropriate operation in this event. Globalization refers to the process of formatting application data in formats appropriate for the locale. Localization refers to the process of loading and dis playing localized strings in the user interface. The CurrentCulture setting for the thread determines the culture that will be used to format application data. The CurrentUICulture setting for the thread determines the culture that will be used to load localized resources. Localized forms can be created by setting the Local izable property of a form to True and then setting the Language property to a lan guage other than (Default). You can implement right-to-left display in a control by setting the RightToLeft property to True. You can reverse the control layout of an entire form by setting the RightToLeftLayout and RightToLeft properties of a form to True. MDI applications follow a parent form/child form model. A parent form con tains and organizes multiple child forms. You can create a parent form by setting the Form.IsMdiContainer property to True. MDI child forms are created by assign ing the MdiParent property to an appropriate MDI parent form. A reference to the
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