Dynamically remove elements (Nifty GUI)

Troubleshooting gui
1

I have been searching the forums for how to dynamically update my GUI during run time. I have found good info on how to add elements dynamically, but I haven’t found things about how to remove elements or possibly make them not visible any longer.



The scenario is that I have a status panel in my GUI and if I select a tile in my game I want to draw various elements(buttons, labels…ect) based on the type of tile the user selects.



This means I would like to remove all current existing elements in the panel and build up a new one.



Anyone have any suggestions about if this is possible?



Short questions:

  1. Can you remove elements dynamically
  2. Can you make existing elements no longer visible or disable them somehow.



    Thanks
2
  1. The Element class has a markForRemoval() method. Maybe this will help you.
  2. The same class also has a setVisible() method.
3

As myamo said you can remove them. If your layout makes trouble, navigate to the parent-element of the element you have removed and call a method that should be something like “layoutElements” or “refreshLayout”. Then the elements of this particular parent-element are rearranged.

4

You can do setVisible to remove things temporarily or markForRemove to remove them permanently.

5

Hi guys,
A wierd issue I am facing while removing elements and adding elements.
I have a panel with 20 elements and I want to remove them all and another 20 elements.
I have written an Controller implementation for this panel. Below is the code from that class

public void removeChildren(){
for(int i=0; i<element.getElements().size(); i++){ ///this has 20 size
element…getElements().get(i).markForRemoval();
}
//call to layout elements
element.layoutElements();
}

Now that panel is empty.
However later when I add another 20 items to that panel. It never shows on the screen
However, printing its getElements().size() gives 20 elements.
I am not sure where I am missing something to get this working.

6

Post your code to add them too.

Do you ever call both the add and the remove in the same frame?

1 Like
7

Well, the addition is immediately after I delete the elements.
Also, I implemented the EndNotify interface and actually added the new elements only after all the elements have been removed by nifty, which we get in the following method

public void perfor() — of the EndNotify interface.

Still, in this case also the new elements are not visible, though they are actually there in the panel.
Sorry, i m at office now, I will post the code once I get home, Thanks

8

Cool, got it working.
Actually have to wait till nifty clears all the elements
in the EndNotify interface implementation.

Then added new elements, Violla

Thanks for same frame hint, it clicked :slight_smile:

9

You can use this code:

[java]private void cleanActivities(){
for(Element tempElement : screen.findElementByName(“winPrC_Parent”).getElements()){
nifty.removeElement(screen, tempElement);
}
nifty.executeEndOfFrameElementActions();
}[/java]

it acts immediatly!!! because you are ending the “frame”.
with “markForRemoval” you have to wait for ending frame…

:wink: good luck