Scroll Help nifty Gui

[void256]

It won't work correctly. Just add enough text so that the text does use more space then your 220px. text added after the 220px will not show and you won't be able to scroll to it.

[renegadeandy]

Aha - you are correct. Darn.

I have a funny feeling I wont be able to make the appropriate change - because I dont understand quite what needs to be done - still learning how to use the predefined controls in nifty gui.

I will make a feature request - but assume it will be a fair bit of time before it gets looked at

[renegadeandy]

I have created a feature request:

http://sourceforge.net/tracker/?func=detail&aid=3034175&group_id=223898&atid=1059825

[void256]

what about using the listbox control for your chat history?

you can add elements there:

Code:

LabelCreator createLabel = new LabelCreator("show off element add");
createLabel.setStyle("nifty-listbox-item");

listbox.addElement(createLabel.create(...

the controls demo in the nifty-examples project shows how to use this in details and it already contains code how to populate the listbox.

[renegadeandy]

Hmm that may just be ideal!

Am trying but not quite got it working, so when a new chat message is received I run the following code:

Code:

   System.out.println("CHAT MESSAGE RECEIVED:" + msgreceived);
            // you can add elements too :)
            LabelCreator createLabel = new LabelCreator(msgreceived);
            createLabel.setStyle("nifty-listbox-item");

            ControlEffectAttributes effectParam = new ControlEffectAttributes();
            effectParam.setName("updateScrollpanelPositionToDisplayElement");
            effectParam.setAttribute("target", "listBoxDynamic");
            effectParam.setAttribute("oneShot", "true");
            createLabel.addEffectsOnCustom(effectParam);
            Element listBoxDataParent = SnowReference.getScreen().findElementByName("chatfieldpanel");
            chatField.addElement(createLabel.create(SnowReference.getNifty(), SnowReference.getScreen(), listBoxDataParent));

And now the relevant section from my XML file looks like this

Code:

        <panel id="ae" childLayout="horizontal" height="100%">
              <label id="af" text="Chat:" align="left" width="25%" textHAlign="left"/>
            <control id="chatfield" name="listBox" horizontal="false" width="*" height="100%" childLayout="vertical" visibleToMouse="true">
              <panel id="chatfieldpanel" width="75%" childLayout="vertical" visibleToMouse="true">
                <label text="Static Item I" style="my-listbox-item-style" />
                <label text="Fo Shizzle" style="my-listbox-item-style" />
                <label text="Static Item III" style="my-listbox-item-style" />
                <label text="Static Items ftw" style="my-listbox-item-style" />
              </panel>
            </control>
          </panel>

When i run the code i get this funny system out message :

CHAT MESSAGE RECEIVED:21:lol
A listener was NOT BEST PLEASED about the message I just gave it.

[void256]

you are a bit unlucky with Nifty aren't you

I'm sorry, I should have told you before that there are two ways to add new listbox items to a listbox:

a) the addItem(String) method to add a simple string
b) the addElement(Element) method to add any element, like images or so to the listbox

in your case method a) would be easier I suppose. can you try this one instead?

in case of method b) there is a little tricky thing you need to know that is not obvious. any element you add to the listbox needs to be a parent of a special element with the listbox id and "Data" appended. In your case you should create the label with the parent (last parameter of createLabel.create call) "chatfieldData". if you look closely to the example then it is using this cumbersome way correctly.

so and now you really can be angry and bitch about nifty! this time I'll understand you!  because this really sucks bad I know this must be changed but hasn't been a top priority yet.

I'm sorry about that specific method  

edit: "A listener was NOT BEST PLEASED about the message I just gave it." <-- was this the error message you received or did you forget to append a stacktrace or so? I can't remember that message and I couldn't find it o_O

[renegadeandy]

Haha ok it was something somebody else in my project committed which was making that sysout!

So i tried chatfield.addItem(msgreceived) however i get a nasty set of null pointers:

Code:

java.lang.NullPointerException
        at de.lessvoid.nifty.controls.dynamic.attributes.ControlAttributes.buildControl(ControlAttributes.java:333)
        at de.lessvoid.nifty.controls.dynamic.attributes.ControlAttributes.createLabel(ControlAttributes.java:286)
        at de.lessvoid.nifty.controls.dynamic.LabelCreator.access$000(LabelCreator.java:10)
        at de.lessvoid.nifty.controls.dynamic.LabelCreator$1.createControl(LabelCreator.java:27)
        at de.lessvoid.nifty.Nifty$ControlToAdd.createControl(Nifty.java:734)
        at de.lessvoid.nifty.Nifty.addControlsWithoutStartScreen(Nifty.java:274)
        at de.lessvoid.nifty.controls.dynamic.LabelCreator.create(LabelCreator.java:30)
        at de.lessvoid.nifty.controls.listbox.controller.ListBoxControl.addItem(ListBoxControl.java:172)
        at org.whiterush.networking.ClientNetworkHandler.messageReceived(ClientNetworkHandler.java:93)
        at snow.network.api.client.connections.ClientConnection._acceptData(ClientConnection.java:113)
        at snow.network.api.client.connections.ClientConnection.run(ClientConnection.java:64)
        at java.lang.Thread.run(Thread.java:619)
java.lang.NullPointerException
        at de.lessvoid.nifty.controls.dynamic.attributes.ControlAttributes.buildControl(ControlAttributes.java:333)
        at de.lessvoid.nifty.controls.dynamic.attributes.ControlAttributes.createLabel(ControlAttributes.java:286)
        at de.lessvoid.nifty.controls.dynamic.LabelCreator.access$000(LabelCreator.java:10)
        at de.lessvoid.nifty.controls.dynamic.LabelCreator$1.createControl(LabelCreator.java:27)
        at de.lessvoid.nifty.Nifty$ControlToAdd.createControl(Nifty.java:734)
        at de.lessvoid.nifty.Nifty.addControls(Nifty.java:257)
        at de.lessvoid.nifty.Nifty.handleDynamicElements(Nifty.java:216)
        at de.lessvoid.nifty.Nifty.render(Nifty.java:177)
        at com.jme3.niftygui.NiftyJmeDisplay.postQueue(NiftyJmeDisplay.java:99)
        at com.jme3.renderer.RenderManager.renderViewPort(RenderManager.java:541)
        at com.jme3.renderer.RenderManager.render(RenderManager.java:562)
        at org.whiterush.main.WhiteRushBase.update(WhiteRushBase.java:322)
        at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:112)
        at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:162)
        at java.lang.Thread.run(Thread.java:619)
25-Jul-2010 18:44:25 com.jme3.app.Application handleError
SEVERE: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at de.lessvoid.nifty.Nifty.addControls(Nifty.java:255)
        at de.lessvoid.nifty.Nifty.handleDynamicElements(Nifty.java:216)
        at de.lessvoid.nifty.Nifty.render(Nifty.java:177)
        at com.jme3.niftygui.NiftyJmeDisplay.postQueue(NiftyJmeDisplay.java:99)
        at com.jme3.renderer.RenderManager.renderViewPort(RenderManager.java:541)
        at com.jme3.renderer.RenderManager.render(RenderManager.java:562)
        at org.whiterush.main.WhiteRushBase.update(WhiteRushBase.java:322)
        at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:112)
        at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:162)
        at java.lang.Thread.run(Thread.java:619)

[void256]

Well, you need to copy everything. Here is the listBox from the nifty-examples project:

Code:

<control id="listBoxStatic" name="listBox" horizontal="false" width="*" height="100%" childLayout="vertical" visibleToMouse="true">
  <panel id="listBoxStaticData" width="100%" childLayout="vertical" visibleToMouse="true">
    <label text="Static Item I" style="my-listbox-item-style" />
    <label text="Fo Shizzle" style="my-listbox-item-style" />
    <label text="Static Item III" style="my-listbox-item-style" />
    <label text="Static Items ftw" style="my-listbox-item-style" />
  </panel>
</control>

You see the panel with the id "listBoxStaticData"? You'll need this one too. EDIT: It's just an element with the same id as the control with "Data" appended.

[renegadeandy]

Ahh right didnt realise that was important...

so now it doesnt error - but it also doesnt append any new strings to the list box?

[void256]

dude, then you need to check if you are missing something else I suppose. It works in the controls example and it worked in a test I've done for you yesterday. Maybe take another look at the example?

[renegadeandy]

The test isnt doing exactly what im doing though - its dynamically creating a listbox and appending to it.

I want to define the listbox in xml and append to it ....

Ill have a further play but not finding this easy.

[void256]

dude, I seriously think you are making fun of me!

let's take that step my step. I've attached a screenshot of the controls example. the example uses two listboxes. one that is static and created in the xml and another that is dynamically created from java. just to show people how to use both mechanism.

then there is the ControlsDemoStartScreen and it's bind() method. at line 158 it says:

Code:

// select first item on the static listbox too
ListBoxControl listBoxStatic = screen.findControl("listBoxStatic", ListBoxControl.class);
listBoxStatic.changeSelection(0);

when you just add a one line:

Code:

// select first item on the static listbox too
ListBoxControl listBoxStatic = screen.findControl("listBoxStatic", ListBoxControl.class);

// add a new item to the listbox
listBoxStatic.addItem("a new item");

you get the result as shown in the screenshot!

what's the problem? <-- I wanted to write f*cking somewhere in there but I don't want to be rude

[renegadeandy]

Ahh i see - this is different to the TestNifty test bundled within jME.

Cheers.

[Tags:]

jMonkey Forum > Troubleshooting > GUI (Moderators: standtrooper, Trussell) > Topic: Scroll Help nifty Gui