How to address a control

[mhc]

Hi,

in B4PPC we can use the control keyword to access a control using a string instead of its name. i.e. Control("name",Panel).Width

How can we do this with B4A?

mhc

 

[Erel]

There are several ways to do it in Basic4android.
In B4A all objects can be passed as parameters to other subs. So instead of passing the control name, you can now pass the control.
If you describe your use case I can give you an example.

 

[mhc]

Erel,

thanks for your answer.
I have have a Timer-Sub which checks if there is a collision between a ball and a pad:

Sub tmBall_Tick
...

'check collision ball and pad
'1. check collision ball and players pad   
If (imgBall.Top<=pnlPlayer.Top+pnlPlayer.Height) AND (imgBall.Left>=pnlPlayer.Left-imgBall.Width-1 AND imgBall.Left<=pnlPlayer.Left+pnlPlayer.Width+1) Then
collision(pnlPlayer)      [COLOR="Green"]'we call the sub with the name of the pad[/COLOR]
End If
'2. check collision ball and computers pad  
If (imgBall.Top+imgBall.Height>=pnlComputer.Top) AND (imgBall.Left>=pnlComputer.Left-imgBall.Width-1 AND imgBall.Left<=pnlComputer.Left+pnlComputer.Width+1) Then 
collision(pnlComputer)
End If
...   
End Sub

The Sub Collision control the ongoing game depending on which kind of pad has the collision:

Sub Collision(pad)
'we detect the position where the pad hit the ball

pos=imgBall.Left-pad.Left+imgBall.Width  [COLOR="Red"]<== doesn't work cause pad is a String[/COLOR]
If pad="pnlComputer" Then
  [COLOR="DarkOrange"] do something[/COLOR]
  [COLOR="darkorange"]... and so on[/COLOR]

End Sub

I know that I can write to subs Collision (i.e. coll1, coll2) and call them depending on the kind of pad. But how can I realize it with only one sub using parameters?

mhc

 

[Erel]

The pad is a panel?
You can use the very useful Tag property of views to add whatever you need to each pad (like the "name").
Then change the sub to:

Sub Collision (pad As Panel)
... 
If pad.Tag = "pnlComputer" Then

End Sub

 

[peacemaker]

in B4PPC we can use the control keyword to access a control using a string instead of its name. i.e. Control("name",Panel).Width
How can we do this with B4A?
mhc

Seems, no reply to this question, how to address the existing views, if we know a name common part ?
Say, check states of "CheckBox1", "CheckBox2", "CheckBox3"....in a loop, addressing views like "CheckBox" + i.

Oops, EDIT: found reason