VBA is an Object-Oriented language whether we agree or not.Object-Oriented Programming (OOP) is really all about 4 little things:. Abstraction. Encapsulation.
In this article you will find some Excel VBA ListView control examples with our analysis of their drawbacks and serious problems. Adding the ListView control in VBA. Before you can add ListView control in VBA, you need to have the MS Windows common controls pack (MSCOMCTL.OCX) installed and registered in your system.
Polymorphism. Inheritance.To make things clear: there’s no inheritance in VBA. But it doesn’t matter, because we can easily compensate with composition, which is often a better design decision, even in languages that support class inheritance.The key to OOP, is classes. Because classes are a blueprint for objects, which are kinda the whole point of OOP.AbstractionIf you’ve been writing code, you’ve been making abstractions. A procedure is abstracting a series of executable operations; a module abstracts a group of related operations, even variables are an abstraction, abstracting the result of an operation.Or is that too abstract?
Levels of abstractionIf you think of the steps required to, say, make coffee, you might think of something like this:. Make sure there’s water in the coffee maker. Make sure there’s coffee in the coffee maker. Start the coffee makerThat would certainly make coffee, right?What sub-steps could there be to make sure there’s water in the coffee maker?
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And to make sure there’s coffee in the coffee maker? Or even to start the coffee maker?
I have been struggling with this myself recently.It basically means that if I have an object, and I create a class that is based on that object, I still have to define all the properties and methods that I want to use for my new class. Ie VBA doesn't help much with the inheritance of anything.You can set a property Implements but to me it does not really help with anything.But if you design your class, say you want a textbox that only allows number input, then you set a member of the class as a textbox, and then within the class procedures and methods you can refer to the properties of the textbox. Implements in VBA simply says that your class exposes all the properties/methods/events of a specific interface class. As you say, you still have to write the code for those yourself, but it means that you can declare a variable as the interface class type and then assign any object that implements that interface to it.Much like you can declare a variable as MSForms.Control and then loop through all the different controls on a form using that variable, even though they are different classes (TextBox, CheckBox, CommandButton etc).
With your own classes, if you don't use Implements you would need a separate variable for each class.Of course, whether or not this is of use will depend on what you are doing. (19 responses) Trying to do something like this If 'Yards' is in column A then copy and paste all the rows to a new book If 'Grass' is in Column A the.(9 responses) I have a user from that is the first part of a mass email script that I am trying to write. What I would like is select one or several checkb.(7 responses) I want to enter information on to the first worksheet, then the code to copy and paste the data to the selected hospital and ward entered in.(24 responses) I have figured out some code to copy all the data from a table, create a new workbook, paste the data and then save the workbook as a CSV as.(10 responses) I have a series of columns for orders on my spreadsheet. The furthest left column contains item numbers, the second column contains the quan.The Holy Grail of Excel Tips $12.60.