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-   -   [Resolved]Odd JavaFX problem (http://www.codingforums.com/showthread.php?t=284972)

rich1051414 12-28-2012 09:36 PM
[Resolved]Odd JavaFX problem
 
So I have a listview that displays a label on a callback that checks a list if that particular item is disabled, and adjusts it display string and appearance occordingly, however, it does not update unless the form is reloaded or I scroll down and back up.

Is there a call I need to make to ensure the cell is repainted after I make a change? I have caching disabled on the listview already, doesn't seem to make a difference. This is my callback:

Code:
...
lv.setCellFactory(new Callback<ListView<String>, ListCell<String>>() {
            @Override
            public ListCell<String> call(ListView<String> list) {
                return new LabelCell();
            }
        });
...
static class LabelCell extends ListCell<String> {

        @Override
        public void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            if (item != null) {
                String s = item;
                Label l;
                if (disabledMods.contains(item)) {
                    s = "DISABLED " + s;
                    l = new Label(s);
                    l.disableProperty().setValue(Boolean.TRUE);
                } else {
                    l = new Label(item);
                    l.disableProperty().setValue(Boolean.FALSE);
                }
                setGraphic(l);
            }
        }
    }

Fou-Lu 12-28-2012 09:45 PM
Despite the similar sounding names, Java is not the same as Javascript.
Moving from javascript forum to Java forum.

I'm not familiar with the JavaFX library (which I recall looking a bit into and its a gui extension?), but what you have here looks similar to swing. Under the description you have here, it is similar to a swing component issue as well. The setGraphic is a bit different though.

Does the JavaFX have an invalidate option as a part of its base component? If so, try invalidating "this" and see if the gui forces a repaint. I often have these same issues with the swing which is why I typically reserve components that are treatable as input components as the container for anything dynamic (textboxes for example will always repaint).

rich1051414 12-28-2012 09:48 PM
Quote:
Originally Posted by Fou-Lu (Post 1302779)
Despite the similar sounding names, Java is not the same as Javascript.
Moving from javascript forum to Java forum.

I'm not familiar with the JavaFX library (which I recall looking a bit into and its a gui extension?), but what you have here looks similar to swing. Under the description you have here, it is similar to a swing component issue as well. The setGraphic is a bit different though.

Does the JavaFX have an invalidate option as a part of its base component? If so, try invalidating "this" and see if the gui forces a repaint. I often have these same issues with the swing which is why I typically reserve components that are treatable as input components as the container for anything dynamic (textboxes for example will always repaint).
I know the difference, and I thought I did post in the Java forum.
And javafx does not invalidate, nor can I find anything about repaint/redraw/paint/etc you would expect from typical java.

Fou-Lu 12-28-2012 10:12 PM
Quote:
Originally Posted by rich1051414 (Post 1302783)
I know the difference, and I thought I did post in the Java forum.
And javafx does not invalidate, nor can I find anything about repaint/redraw/paint/etc you would expect from typical java.
Hmm, is the behaviour the same as it is in swing with changing label text? If so I can try and track down something online for the JavaFX to see if there is anything in particulars.

rich1051414 12-28-2012 10:27 PM
Quote:
Originally Posted by Fou-Lu (Post 1302790)
Hmm, is the behaviour the same as it is in swing with changing label text? If so I can try and track down something online for the JavaFX to see if there is anything in particulars.
I have read many problems with javafx controls not refreshing their view, but none of these seem to work in my situation. I have also tried mapping seperate labels for each item, and setting the text, but it still does not trigger a redraw. I have also tried setting the labels invisible and visible again, but this also does not trigger a redraw, I am a bit stumped.

Edit: I fixed it by forcefully clearing and repopulating the list, forcing it to redraw all items. Not ideal, but it works.

Fou-Lu 12-29-2012 08:53 PM
Quote:
Originally Posted by rich1051414 (Post 1302793)
I have read many problems with javafx controls not refreshing their view, but none of these seem to work in my situation. I have also tried mapping seperate labels for each item, and setting the text, but it still does not trigger a redraw. I have also tried setting the labels invisible and visible again, but this also does not trigger a redraw, I am a bit stumped.

Edit: I fixed it by forcefully clearing and repopulating the list, forcing it to redraw all items. Not ideal, but it works.
Glad you found a solution to this. Swing is bad enough in you typically have to invalidate a component, but needing to force a redraw by repopulating certainly isn't ideal. I'd assume that there is a better approach to it as well, but I'm afraid I can't really help with it since I'm not versed in javafx at all. Eventually you'll stumble on the best solution though (you'd think oracle would be explicit in their documentation for stuff like this).


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