Android Question object base class

[Kiran Raotole]

Hii experts,
I have to create an application by custom components class.
in which I want all same property of default object.
like Button class, I want to create my custom components button which contains all property and event of buttons. like in other software, there is option of base class, to take all similar property to this class.

I created a new custom components custbutton
I add it in my designer trying to generate button_click event, but it not show.

 

[Erel]

Your class will never be a button. You can however implement custom views with buttons or any other view you like.

[B4X] Custom Views with Enhanced Designer Support

 

[Kiran Raotole]

ok. but in custom view I cant to take all events and properties of base class.

 

[Erel]

You should handle them inside your class.

 

[Kiran Raotole]

I try it. I create my custom view. In designercreateview my code is :

Public Sub DesignerCreateView (Base As Panel, Lbl As Label, Props As Map)
   mBase = Base
   Dim label As Label
   label.Initialize("label1")
   mBase.AddView(label,0,0,mBase.Width,mBase.Height)
   label.Color = Colors.Transparent
   Log(label.Text)
   'label.TextColor = Colors.Black
End Sub

in designer view I assigned property text, but It not show in my application.

 

[Erel]

Of course it will not work like this. The text property goes to Lbl.Text.

 

[Kiran Raotole]

So, How to do it?

[B4X] Custom Views with Enhanced Designer Support
I check this, but its not satisfactual.

 

[Erel]

How to do what?

 

[Kiran Raotole]

Create custom object with one of base class.
ex. create custom object of button including all button property and event

 

[Erel]

You will need to create a custom view and add all the properties and events. It will not happen automatically.

 

[Kiran Raotole]

any other option for this.

 

[OliverA]

Are you looking for inheritance? Then see this: https://www.b4x.com/android/forum/t...x-inheritance-polymorphism.64453/#post-408114

Polymorphism? See above link and https://en.wikipedia.org/wiki/Duck_typing (Also mentioned here https://www.b4x.com/android/forum/threads/classes-are-soon-coming.18395/)

Recommended: Composition. See https://www.b4x.com/android/forum/threads/inheritance.47900/#post-297179. https://www.b4x.com/android/forum/threads/how-i-will-extend-a-b4j-or-b4a-class.48055/#post-315405

 

[Kiran Raotole]

yes inheritance, Is it possible.how?

 

[OliverA]

As my first link shows, Inheritance will (most likely) not be implemented in the B4X products. The recommended approach is Composition (https://en.wikipedia.org/wiki/Composition_over_inheritance) as mentioned in the last two links of my post.

 

[Kiran Raotole]

I need to get default value of my custom property.

#DesignerProperty: Key: BackgroundColor, DisplayName: BackgroundColor,FieldType: Color, DefaultValue: #00E650

this is my property. I'm trying mBase.Color = Props.Get("BackgroundColor")

How does I get defaultvalue of property of my custom view ?
and how those I get know whether a property default value is changed

 

[Kiran Raotole]

I need to get default value of my custom property.

#DesignerProperty: Key: BackgroundColor, DisplayName: BackgroundColor,FieldType: Color, DefaultValue: #00E650

this is my property. I'm trying mBase.Color = Props.Get("BackgroundColor")

How does I get defaultvalue of property of my custom view ?
and how those I get know whether a property default value is changed

I got this.

I have issue that, I created default property of color, then I insert object in activity, if then I change the color default property then activity color does not change.

 

[Kiran Raotole]

Also I want to give it round and button click hot tracking like effect, how can I do it?

 

[Cableguy]

You should use set/get to retrieve and to set values.

Example:

Public Sub setColor(value as int)
Myview.color=value
End sub

Public Sub getColor as it
Return Myview.color
End sub

Please not the lowercasing of the words get/set

Then in your app you can

MyView=25865 (this sets the value)

Dim myColor=Myview.color as int


Remember this is pseudo-code
You should also read the booklets as they cover extensively the custom views and their properties

 

[Kiran Raotole]

OK thanks.

 

[Kiran Raotole]

Now, I create a EditText custom view .In activity I change text property.
but it not change anything.

Does there is any command for this or I have to add all my property?