If none of the existing methods can perform your desired task, you can add a method to a class.įor example, the MessageBox control has a method named Show, which is called in the code snippet below − The requirements of such a method depend on the class being used. If you are using a control such as one of those provided by the Toolbox, you can call any of its public methods. There are mainly two categories of methods you will use in your classes − Methods are used to access or manipulate the characteristics of an object or a variable. Control MethodsĪ method is a procedure created as a member of a class and they cause an object to do something. You can refer to Microsoft documentation for a complete list of properties associated with different controls and restrictions applied to them. Most of the properties can be set or read during application execution. You can set any of the form properties using Properties Window. Property is the characteristic you want to change. Object is the name of the object you're customizing. Properties can be set at design time by using the Properties window or at run time by using statements in the program code. A property is a value or characteristic held by a Visual Basic object, such as Caption or Fore Color. Methods cause an object to do something andĮvents are what happens when an object does something.Īll the Visual Basic Objects can be moved, resized or customized by setting their properties. Every Visual Basic control consists of three important elements − In fact, in Visual Basic, the form itself is an object. Select Ctrl as Modifier and E as the key.An object is a type of user interface element you create on a Visual Basic form by using a toolbox control. Select the Edit menu item and select its ShortcutKeys property in the properties window. For example, to set a shortcut key CTRL + E, for the Edit menu − When you set a shortcut key for a menu item, user can press the shortcut from the keyboard and it would result in occurrence of the Click event of the menu.Ī shortcut key is set for a menu item using the ShortcutKeys property. In other words, you change the text property of the file menu to &File. Setting access keys for a menu allows a user to select it from the keyboard by using the ALT key.įor example, if you want to set an access key ALT + F for the file menu, change its Text with an added & (ampersand) preceding the access key letter. When the above code is executed and run using Start button available at the Microsoft Visual Studio tool bar, it will show the following window −Ĭlicking on the Enable Project button enables the project menu − ProjectToolStripMenuItem1.Enabled = FalseĪdd a button control on the form with text 'Enable Project'. Let us disable the Project Menu on the menu bar. The Enabled property allows you to disable or gray out a menu item. When the above code is executed and run using Start button available at the Microsoft Visual Studio tool bar, it will show the following window:Ĭlicking on the Show Project button displays the project menu − Private Sub Button1_Click(sender As Object, e As EventArgs) _ ProjectToolStripMenuItem1.Visible = FalseĪdd a button control on the form with text 'Show Project'.Īdd the following code snippet to the Button1_Click event − Private Sub Form1_Load(sender As Object, e As EventArgs) _ Let us hide the Project Menu on the menu bar.Īdd the following code snippet to the Form1_Load event − The Visible property of the ToolStripMenuItem class allows you to hide or show a menu item. In this example, let us continue with the example from the chapter 'VB.Net - MenuStrip control'. Occurs when the value of the CheckState property changes. Occurs when the value of the Checked property changes. The following are some of the commonly used events of the ToolStripMenuItem control − Gets or sets a value indicating whether the shortcut keys that are associated with the ToolStripMenuItem are displayed next to the ToolStripMenuItem. Gets or sets the shortcut keys associated with the ToolStripMenuItem. Gets a value indicating whether the ToolStripMenuItem appears on a multiple document interface (MDI) window list. Gets or sets a value indicating whether the control is enabled. Gets or sets a value indicating whether a ToolStripMenuItem is in the checked, unchecked, or indeterminate state. Gets or sets a value indicating whether the ToolStripMenuItem should automatically appear checked and unchecked when clicked. Gets or sets a value indicating whether the ToolStripMenuItem is checked.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |