panelview dragging not smooth

[HarveyKwok]

Could anyone help to solve the following problem:
Attached is a panel for dragging, when I drag/move it , sometime it will vibrate itself abnormally , why it be happen?
(sorry for my bad in English)

 

[klaus]

The code below works:

Sub Activity_Touch (Action As Int, X As Float, Y As Float)
    Select Action
    Case Activity.ACTION_DOWN
        dx = X
        dy = Y
        pnlLeft = p.Left
        pnlTop = p.Top
    Case Activity.ACTION_MOVE
        p.Left =  (pnlLeft + X - dx)
        p.top     =  (pnlTop + Y - dy)
        Activity.Title = p.Left & " | " &p.top
    Case Activity.ACTION_UP
    End Select
End Sub

The problem in your code is that you modify the Left and Top properties insides the p_Touch even and the reference is modified every time you move.

Best regards.

 

[Erel]

Please use File - Export as zip when uploading files to the forum.

A working example is available here: http://www.b4x.com/forum/basic4android-updates-questions/18395-classes-soon-coming.html#post105519

It is important to use Reflector.SetOnTouchListener instead of the standard Touch event.

 

[HarveyKwok]

Klaus,
Thanks so much for you help, maybe my coding logic is wrong at initially
I am just want to move the panel follow my point (dragging).

The code below works:

Sub Activity_Touch (Action As Int, X As Float, Y As Float)
    Select Action
    Case Activity.ACTION_DOWN
        dx = X
        dy = Y
        pnlLeft = p.Left
        pnlTop = p.Top
    Case Activity.ACTION_MOVE
        p.Left =  (pnlLeft + X - dx)
        p.top     =  (pnlTop + Y - dy)
        Activity.Title = p.Left & " | " &p.top
    Case Activity.ACTION_UP
    End Select
End Sub

The problem in your code is that you modify the Left and Top properties insides the p_Touch even and the reference is modified every time you move.

Best regards.

 

[HarveyKwok]

Erel,

Thanks for your help,
In fact, you let us in a rapid and easy way to code for android apps,
and the greatest thing is that, you improve this tool constantly.

Please use File - Export as zip when uploading files to the forum.

A working example is available here: http://www.b4x.com/forum/basic4android-updates-questions/18395-classes-soon-coming.html#post105519

It is important to use Reflector.SetOnTouchListener instead of the standard Touch event.

 

[HarveyKwok]

klaus or anyone,
Could you show me more that
1. how to drag when I touch the panelview only; your code makes dragging anywhere on screen where I touch it

2. if there are 2 panelviews on the screen , how could drag the one which I touch it.

 

[Erel]

Try the example I posted. It lets you drag any view you like.

 

[HarveyKwok]

Erel,
I had tried the code from your post, It had run perfectly.
In fact, I want to trap the position when stop move, and run my sub, how can it do it in the Main - Activity, (not inside the your class)
I can do it, if use panel_touch with "Action" trapping

 

[HarveyKwok]

Problem code here

Please help to exam the following code, when I dragging the Square, I hope to show the Left position of the Square on the title bar, but it seems doesn't work correctly

Sub Globals
  Dim Button1 As Button
  Dim Button2 As Button
  Dim dv(2) As DraggableView   
End Sub

Sub Activity_Create(FirstTime As Boolean)
  Activity.LoadLayout("1")
  dv(0).Initialize(Activity, Button1)
  dv(1).Initialize(Activity, Button2
End Sub

Sub Activity_Touch (Action As Int, X As Float, Y As Float)
  Activity.Title = dv(0).left
End Sub

 

[Erel]

In fact, I want to trap the position when stop move, and run my sub, how can it do it in the Main - Activity, (not inside the your class)

You can use CallSub to call a sub in your activity.