javafx listview and treeview controls are not repainted correctly


Question

i am trying to put elements on a listview and treeview with javafx, but both controls wont refresh theyre content. i am using an obvservable list to control the items and every time i delete one item, the listview or treeview removes it from the datasource. but the view is not updating. i am still seeing all the items. the only difference is, the removed item can not be selected any more. for example link 2 shows the collaped item list. image 1 shows the items before they are collaped. the items are collapsed but the old entry is still visible. does anybody know a solution for this problem. thank you all for helping me

link 1: treeview is not collapsed link 2: treeview is collapsed but not updating old view

this is the custom cell factory i use to display a listview:

public ListCell<T> call(final ListView<T> param) {
        ListCell<T> cell = new ListCell<T>(){
            @Override
            protected void updateItem(final T persistentObject, final boolean empty) {
                super.updateItem(persistentObject, empty);
                if(persistentObject instanceof POProcessStep){
                    POProcessStep poProcessStep = (POProcessStep) persistentObject;
                    if (persistentObject != null) {
                        super.setText(poProcessStep.getId() + " - " + poProcessStep.getTitle());
                    }
                }else if(persistentObject instanceof POProcess){
                    POProcess poProcess = (POProcess) persistentObject; 
                    if (persistentObject != null) {
                        super.setText(poProcess.getId() + " - " + poProcess.getTitle());
                    }
                }else if(persistentObject instanceof POCategory){
                    POCategory poCategory = (POCategory) persistentObject;
                    if(persistentObject != null){
                        super.setText(poCategory.getId() + " - " + poCategory.getTitle());
                    }
                }else if(persistentObject instanceof String){
                    if(persistentObject != null){
                        super.setText(String.valueOf(persistentObject));
                    }
                }
                super.setGraphic(null);
            }
        };
        return cell;
    }
1
4
11/8/2014 9:20:27 PM

Accepted Answer

Your cell factory's updateItem(...) needs to handle the case where the cell is empty. This will be exactly the scenario when an item is removed (or becomes empty because a node in the TreeView was collapsed) and the cell that previously showed an item is reused as an empty cell:

public ListCell<T> call(final ListView<T> param) {
    ListCell<T> cell = new ListCell<T>(){
        @Override
        protected void updateItem(final T persistentObject, final boolean empty) {
            super.updateItem(persistentObject, empty);
            if (empty) {
                setText(null);
                setGraphic(null);
            } else {
                // ... rest of your code.
            }
       }
    }
    return cell ;
}
15
5/3/2018 3:17:40 PM

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