panelview dragging not smooth

HarveyKwok · Jun 30, 2012

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 · Jun 30, 2012

The code below works:

B4X:

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 · Jul 1, 2012

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 · Jul 2, 2012

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).

klaus said:
The code below works:

B4X:

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 · Jul 2, 2012

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.

Erel said:
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 · Jul 3, 2012

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 · Jul 3, 2012

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

HarveyKwok · Jul 3, 2012

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 · Jul 4, 2012

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

B4X:

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 · Jul 4, 2012

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.

panelview dragging not smooth

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