B4J Question Trying to position a button by code, its not moving?

[aidymp]

I wrote a big sub to do this but nothing happened.

so I just tried this line

Button2.Left=250

but still the button fails to move? am I missing something?

Thanks

Aidy

 

[LucaMs]

It should work.

Can you post the project? (or part of it)

 

[aidymp]

Here is a blank project, opened designer, added a button, tried some basic code

Button1.Left=130
Button1.PrefHeight=66

nothing happens to the button?

project attached

Seems like its ignoring me! lol

 

[LucaMs]

Uhm...

If you move the code (those 2 lines) to Sub Button1_Action, for example, it works.

B4j does not have commands like DoEvents, Invalidate, Refresh... I'm searching for a solution, but If someone (Erel? )...

 

[aidymp]

Uhm...

If you move the code (those 2 lines) to Sub Button1_Action, for example, it works.

B4j does not have commands like DoEvents, Invalidate, Refresh... I'm searching for a solution, but If someone (Erel? )...

Very strange, I have a sub called Scheme, i put the code in there like

#Region  Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 400
#End Region

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private Button1 As Button
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.SetFormStyle("UNIFIED")
    MainForm.RootPane.LoadLayout("form") 'Load the layout file.
    MainForm.Show
    scheme
End Sub

Sub scheme
    Button1.Left=130
    Button1.PrefHeight=66
End Sub

Still nothing happens, lol

 

[LucaMs]

It's the same. We need a refresh (doevents) after MainForm.Show

 

[LucaMs]

Found this statement:

You don't need to invalidate the view. The drawing will appear immediately.

But, as you know...!

 

[LucaMs]

There is no DoEvents method in B4J (due to technical reasons).

You can split the task into several tasks and then use CallSubDelayed to start each task. Another option is to use the threading library and run this task with a background thread.

 

[Erel]

It has nothing to do with DoEvents.

1. You should manage the layout with the visual designer.
2. To change the layout of a designer view in your code then:
a. Make the change in Panel_Resize event.
b. Or prevent the layout from handling the resize event.

 

[LucaMs]

I was writing:
If you create a "scene builder layout" (fxml) and load it (MainForm.RootPane.LoadLayout("MySecondLayout"), then ...



It works but you need to create a fxml layout.
Probably Erel's solution is a little better

 

[aidymp]

So simply removing the tick, fixes the problem! Thanks to both of you. I was beginning to think SHOUTING AT IT MAY HELP! lol

Thanks Guys as always awesome!

 

[LucaMs]

It has nothing to do with DoEvents.

1. You should manage the layout with the visual designer.
2. To change the layout of a designer view in your code then:
a. Make the change in Panel_Resize event.
b. Or prevent the layout from handling the resize event.

Ehm... I tried (before your post, then I'm not so stupid, lol) searching for some form/pane event (thank to the very useful "help of tab"), but I don't know the panel name, so I don't know the full event name.

 

[LucaMs]

Ehm... I tried (before your post, then I'm not so stupid, lol) searching for some form/pane event (thank to the very useful "help of tab"), but I don't know the panel name, so I don't know the full event name.

MainForm_Resize

!!!

(not too much intuitive )

 

[LucaMs]

So simply removing the tick, fixes the problem!

?