Nifty gui popups

Troubleshooting gui
1

I can’t get nifty gui popups to work.



This is the xml code of the popup:[java] <popup id=“popup” width=“50%” height=“50%”>

<layer id=“layer” backgroundcolor="#0000" childlayout=“center”>

<panel width=“50%” height=“50%” childLayout=“vertical” backgroundColor="#00FF">

<control name=“label” text=“test” />

</panel>

</layer>

</popup>[/java]This is between the and tags.



and when I use this code, AFTER nifty is initialized and when a screen is displayed, nothing happens:[java]nifty.showPopup(nifty.getCurrentScreen(), “popup”, null);[/java]I have already put a System.out.printline right behind that to see if it was getting called, which does happen.

2

Are you defining the popup inside the screen tags? It needs to be inside the screen definition.



Be aware if using popups that trying to change screen with a popup open does nasty things at the moment.

3

now I have this popup xml code, inside the screen that should have the popup. And now as soon as I switch to that screen, nifty.getcurrentscreen() becomes 0, which trows a nullpointerexception in the simpleupdate method because I check that. And that is before opening the popup.

4

I finally got the popup to work, and I tried converting one of my screens into a popup, but this gives a nullpointerException:[java] nifty.createPopup("Winkel");

nifty.findPopupByName("Winkel").findControl("geld", LabelControl.class).setText("Geld: " + app.geld);

lbc = nifty.findPopupByName("Winkel").findControl("Voorwerpen", ListBoxControl.class);[/java]This is in the MenuController.bind method, and this gets executed right after the screen the popup should overlay is initialized.



This is the code for the popup:[java]<popup id="Winkel" controller="mygame.MenuController" childLayout="center">

<panel width="100%" height="100%" backgroundColor="#0000" childLayout="center">

<control name="window" title="Winkel" width="500px" height="300px" align="center" valign="center" closeable="false">

<panel width="100%" height="100%" childLayout="vertical" backgroundColor="#00FF">

<control name="label" text="Geld: ###################################" id="geld" />

<control id="Voorwerpen" name="listBox" vertical="optional" horizontal="optional" displayItems="4" selection="Single" ForceSelection="true" />

<control name="label" text="Prijs: (selecteer een item)" id="prijs" width="100%" align="left" textHAlign="left" />

<control name="label" text="Beschrijving: (selecteer een item)" id="beschrijving" width="100%" align="left" textHAlign="left" textVAlign="top" height="80px" />

<control name="button" label="Koop item" align="left" visibleToMouse="true">

<interact onClick="koop()" />

</control>

<control name="button" label="Terug" align="left" visibleToMouse="true">

<interact onClick="closeShop()" />

</control>

</panel>

</control>

</panel>

</popup>[/java]



What am I doing wrong?

5

[java]nifty.createPopup(“Winkel”);[/java] … will create a new element with a new generated id! The findPopupByName() call will not find this popup instance. A better approach would be to simply keep the return value of the nifty.createPopup() call:



[java]Element popup = nifty.createPopup(“Winkel”);

popup.findControl …[/java]



The manual covers that in the chapter “POPUP LAYERS” on page 41-43. And yeah, I know that this is a bit weird but it is what it is (at the moment at least).