Library tutorials & articles
Creating Classes & ActiveX Controls
James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...
- Introduction
- Using classes and controls
- Creating a class
- Creating a control
- Variables and Properties
- Mapping your controls' properties onto other contr
- Specifying when properties can be set and read
- Specifying default values for properties
- Saving and reading properties
- Hiding Properties at Design Time
- Methods
- Constants and Enums
- Adding Descriptions
- Conclusion
Mapping your controls' properties onto other contr
If you want to have a property for your control, that you want to map directly to another controls property (ie if you have a text box in your control, and when the user changes your controls Text property, you want it to automattically change the Textbox's text property), then you can do the following:
'// the back color property. This is called when the client requests
the value of BackColor
Public Property Get Text() As String
BackColor = txtMain.Text '// return the textbox.text
property
End Property
'// this is called when the client requests to change the value of BackColor.
Public Property Let Text(ByVal Text As String)
'// if the property is read only (ie the client cannot change
its value), you do not need this procedure.
'// before you assign the new value, you could check to see
if it is empty etc:
'// If New_Text = Empty Then Exit Property
txtMain.Text = New_Text '// set the textbox.text property
to the new value
PropertyChanged "Text" '// property has changed
End Property
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thanks!!! a great help for developers.
--all glory to my great provider...--
Of all the books and tutorials I've read on classes & activeX,this should be the best.Thanx to the author.
I am fairly new at coding in VB and love diving in. I am working on a project on reading binary files, parsing bit data information and creating a display from some function of bits. The first couple of words will tell me how to set up a window and other parameters. Since my first run at creating this program, I have since discovered the use of classes as separate modules. I'm trying to create a couple of classes, one for setting of the parameters and the other for program settings. Using the Property of Let & Get has worked great and makes the management of what I am doing easier. But I have a couple of questions regarding of how to try to pass arrays like I would the other values.
For example, recalling a list of last opened file names and making them available to other modules, I had wanted to try to put it in a class like the other properties, but when I don't know if and how many how do I do that?
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