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post #21 of 49
In order for the right print method to get called, you need to make the base print method virtual:

class Panel
{
public virtual void print()
{
Console.Write("Im base Panel");
}
}

and then in your subclasses (the classes that inherit from panel) override this method with one specific to the subclass:

class PicturePanel : Panel
{
public override void print()
{
Console.Write("Im Picture Panel");
base.Print();
}
}

Also, since you want to call print from other classes, you need to make the methods public, not protected. Protected is for methods only called by the same class or subclasses of the same class.
post #22 of 49
Quote:
Originally Posted by 3930K View Post

Not very clean... see my post, should work better.

Take a look at my quote - possibly even cleaner. All that is needed is a virtual method and an overridden method - generics is one way to do it but it's a bit more complicated.
post #23 of 49
Thread Starter 
ok so I have a question. I have an abstract class called component. Every UI class has to inherit from this class. example Button, DropMenu, ViewList, MenuStrip etc...

All of these classes have common methods like Initialize()), LoadContent(), Update(), Draw().
Code:
class Button : Component
    {
        public Button()
        {
        }

        public new void Initialize(GraphicsDeviceManager Graphics)
        {

            base.Initialize(Graphics);
        }

        public void LoadContent(ContentManager Content, string StyleFilePath)
        {

            base.LoadContent(Content, StyleFilePath, "ButtonStyle");
        }

        public new void Update()
        {

            base.Update();
        }

        public void Draw(SpriteBatch spriteBatch)
        {

            base.Draw(spriteBatch, Color.White);
        }

        public void DrawString(SpriteBatch spriteBatch)
        {

            base.DrawString(spriteBatch, Font);
        }

Do you think I should use an interface or just leave it this way?
    
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post #24 of 49
Quote:
Originally Posted by Fantasy View Post

ok so I have a question. I have an abstract class called component. Every UI class has to inherit from this class. example Button, DropMenu, ViewList, MenuStrip etc...

All of these classes have common methods like Initialize()), LoadContent(), Update(), Draw().
Code:
class Button : Component
    {
        public Button()
        {
        }

        public new void Initialize(GraphicsDeviceManager Graphics)
        {

            base.Initialize(Graphics);
        }

        public void LoadContent(ContentManager Content, string StyleFilePath)
        {

            base.LoadContent(Content, StyleFilePath, "ButtonStyle");
        }

        public new void Update()
        {

            base.Update();
        }

        public void Draw(SpriteBatch spriteBatch)
        {

            base.Draw(spriteBatch, Color.White);
        }

        public void DrawString(SpriteBatch spriteBatch)
        {

            base.DrawString(spriteBatch, Font);
        }

Do you think I should use an interface or just leave it this way?


You should be using virtual methods or an abstract class for that. When I see "new" used, its usually not for the right purpose. Each of those methods should be declared virtual in the Component class, then you override them with "override".
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post #25 of 49
Thread Starter 
Quote:
Originally Posted by voidsstr View Post

In order for the right print method to get called, you need to make the base print method virtual:

class Panel
{
public virtual void print()
{
Console.Write("Im base Panel");
}
}

and then in your subclasses (the classes that inherit from panel) override this method with one specific to the subclass:

class PicturePanel : Panel
{
public override void print()
{
Console.Write("Im Picture Panel");
base.Print();
}
}

Also, since you want to call print from other classes, you need to make the methods public, not protected. Protected is for methods only called by the same class or subclasses of the same class.

I thought when you override a method then you can't use it's contents. hmm.... let me try and see if that works.
    
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post #26 of 49
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

You should be using virtual methods or an abstract class for that. When I see "new" used, its usually not for the right purpose. Each of those methods should be declared virtual in the Component class, then you override them with "override".

ok. but does it make any difference if I leave it that way or use virtual? I mean it's the same thing. Isn't it?
    
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post #27 of 49
Quote:
Originally Posted by Fantasy View Post

I thought when you override a method then you can't use it's contents. hmm.... let me try and see if that works.

If you mean you can't give the method a body - then no. This is only the case for PURE virtual methods (i.e. abstract).
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post #28 of 49
Quote:
Originally Posted by Fantasy View Post

ok. but does it make any difference if I leave it that way or use virtual? I mean it's the same thing. Isn't it?

No it really isn't. You've never actually overriden the Base version of Initialize(). You've only hidden it with a separate virtual method (named the same).

When you use the new keyword on a method signature - you are telling the compiler that this is a method that happens to have the same name as a method of one of your base classes - but has no other relation. You can make this new method virtual but that's not the same as overriding the base class method.

Please see:
http://stackoverflow.com/questions/1508350/why-does-this-polymorphic-c-code-print-what-it-does/1510702#1510702
http://msdn.microsoft.com/en-us/library/6fawty39%28VS.80%29.aspx
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post #29 of 49
Quote:
Originally Posted by Fantasy View Post

ok so I have a question. I have an abstract class called component. Every UI class has to inherit from this class. example Button, DropMenu, ViewList, MenuStrip etc...

All of these classes have common methods like Initialize()), LoadContent(), Update(), Draw().
Code:
class Button : Component
    {
        public Button()
        {
        }

        public new void Initialize(GraphicsDeviceManager Graphics)
        {

            base.Initialize(Graphics);
        }

        public void LoadContent(ContentManager Content, string StyleFilePath)
        {

            base.LoadContent(Content, StyleFilePath, "ButtonStyle");
        }

        public new void Update()
        {

            base.Update();
        }

        public void Draw(SpriteBatch spriteBatch)
        {

            base.Draw(spriteBatch, Color.White);
        }

        public void DrawString(SpriteBatch spriteBatch)
        {

            base.DrawString(spriteBatch, Font);
        }

Do you think I should use an interface or just leave it this way?

Interfaces are usually used if you plan on completely replacing this implementation at some point with new code, but you don't want to affect the code that calls it or uses it in some way.

I would probably stick with virtual methods, and override them in your subclasses.
post #30 of 49
Quote:
Originally Posted by Fantasy View Post

ok. but does it make any difference if I leave it that way or use virtual? I mean it's the same thing. Isn't it?

Virtual means you have a base implementation, but you need to override it or provide a new version for classes that inherit from this class. If you don't use virtual, you cannot override the method in subclasses.
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