Nsryjdtyk

Can anyone tell me why some items from a dropdown list are not visible when running the jar application? It seems to happen randomly. I create an ObservableList, then recursively create a Line, assign it a stroke type from the observable list through a String as line.setStyle("-fx-stroke-dash-array:" + dashString + ";"). Finally, everything works fine and the ComboBox gets the whole list of line and a certain selection. But it sometimes fail to display lines in the dropdown list. The code is:

package test;    

import java.util.ArrayList;

import javafx.application.Application;

import javafx.collections.FXCollections;

import javafx.collections.ObservableList;

import javafx.scene.Scene;

import javafx.scene.control.ComboBox;

import javafx.scene.layout.StackPane;

import javafx.scene.paint.Color;

import javafx.scene.shape.Line;

import javafx.stage.Stage;



public class ComboLines extends Application {

    public static void main(String args) {

        launch(args);

    }



    @Override

    public void start(Stage primaryStage) {



        ComboBox<Line> dashCombo = new ComboBox<>(); 

        initDashLineCombo(dashCombo, dashUnit, 2);

        dashCombo.getStylesheets().add("test/style.css");                                                                                                      

        dashCombo.setStyle("-fx-min-width: 100; -fx-max-width: 100; -fx-pref-width: 100; -fx-min-height: 15; -fx-pref-height: 15; -fx-max-height: 15;");  

        StackPane root = new StackPane();

        root.getChildren().add(dashCombo);

        primaryStage.setScene(new Scene(root, 150, 300));

        primaryStage.show();

    }



    public static void initDashLineCombo(ComboBox<Line> cb, ObservableList<int> list, int i)

    {        

        ArrayList<Line> LinesList = new ArrayList<>(); // to store lines        

        // cycle over the list and generate a line with dashing defined by list

        for(int j = 0; j < list.size(); j++)

        {

            int sum = 0;

            int dash = list.get(j);

            String dashString = " ";

            for(int k : dash) // cycle over an int array which defines the dashing

                {   dashString += k + " ";

                    sum += k; }

            System.out.println("sum = " + sum);

            Line line = new Line(15, 0, 1*(15+sum), 0);

            System.out.print("ndashString :" + dashString);

            // apply style

            line.setStrokeWidth(2);// line width

            line.setStroke(Color.BLACK);

            line.setStyle("-fx-stroke-dash-array:" + dashString + ";"); // line dashing

            LinesList.add(line); // collect the line          

        }

        // create the observable list

        final ObservableList<Line> LinesObs = FXCollections.observableArrayList(LinesList); 

        // set all line items in the combo box

        cb.setItems(LinesObs);         

        // select an item ion the combo box

        cb.setValue(LinesObs.get(i-1)); 

    }

        // ... dashing ...

        int s10 = {1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3,}; 

        int s9 = {1,3,1,3,1,4,5,4,5,4, 1,3,1,3,1,4,5,4,5,4};

        int s8 = {6,3,6,3,6,5,1,5, 6,3,6,3,6,5,1,5}; 

        int s7 = {1,3,1,3,1,6,6,6, 1,3,1,3,1,6,6,6};

        int s6 = {5, 3, 5, 3, 5, 3, 5, 3, 5, 3, 5, 3, 5, 3, 5, 3}; 

        int s5 = {5, 4, 5, 4, 1, 3, 1, 4, 5, 4, 5, 4, 1, 3, 1, 4}; 

        int s4 = {5, 4, 1, 3, 1, 4, 5, 4, 1, 3, 1, 4, 5, 4, 1, 3, 1, 4}; 

        int s3 = {5, 3, 1, 3, 5, 3, 1, 3, 5, 3, 1, 3, 5, 3, 1, 3}; 

        int s2 = {15, 3, 15, 3, 15, 3}; 

        int s1 = {60}; 

        final ObservableList<int> dashUnit = FXCollections.observableArrayList(s1, s2, s3, s4, s5, s6, s7, s8, s9, s10);



}



     /* style.css */



     .combo-box {

      -fx-min-width: 35;

      -fx-pref-width: 35;

      -fx-max-width: 35;

      -fx-min-height: 20;

      -fx-pref-height: 20; 

      -fx-max-height: 20; 

      -fx-padding: -2 -8 -2 -5;

       }

     .combo-box-base > .arrow-button { 

     -fx-background-radius: 0 3 3 0, 0 2 2 0, 0 1 1 0; 

     -fx-background-color: transparent; 

     -fx-alignment: center-left; 

       }

     .combo-box .cell {

     -fx-font-size: 8.75pt; 

     -fx-font-family: "Arial";

     -fx-text-fill: BLACK;

     -fx-alignment: BASELINE_RIGHT;

     -fx-padding: 0 3 0 -5;

      }

invisible lines

UPDATE: Using cell factory a simplified version (no CSS and no dashing applied) is like this. The same problem persists and further I cannot get the initial selection applied.

 package test;    

 import javafx.application.Application;

 import javafx.collections.FXCollections;

 import javafx.collections.ObservableList;

 import javafx.scene.Scene;

 import javafx.scene.control.ComboBox;

 import javafx.scene.control.ListCell;

 import javafx.scene.control.ListView;

 import javafx.scene.layout.StackPane;

 import javafx.scene.shape.Line;

 import javafx.stage.Stage;

 import javafx.util.Callback;



 public class ComboLines extends Application 

 {

     public static void main(String args) { launch(args); }   

     ComboBox<Line> dashCombo = new ComboBox<>();     

     @Override

     public void start(Stage primaryStage) 

     {    

         StackPane root = new StackPane();

         root.getChildren().add(dashCombo);

         dashCombo.setItems(FXCollections.observableList(DASHUNIT));

         dashCombo.getSelectionModel().selectFirst();

         dashCombo.setCellFactory(new Callback<ListView<Line>, ListCell<Line>>()

    {

    @Override

        public ListCell<Line> call(ListView<Line> newLine)

        {

            return new ListCell<Line>()

            {

                @Override

                protected void updateItem(Line item, boolean y) 

                    {

                        super.updateItem(item, false);

                        setGraphic(item); 



                    } // end updateItem

            } ; // end new ListCell

        } // end call()

    }); // end setCellFactory



    primaryStage.setScene(new Scene(root, 150, 300));

    primaryStage.show();

    }



    Line line1 = new Line(15, 0, 50, 0), line2 = new Line(15, 0, 50, 0), line3 = new Line(15, 0, 50, 0); 

    final ObservableList<Line> DASHUNIT = FXCollections.observableArrayList(line1, line2, line3);

}

Finally, I got it working with the code below. Following kleopatra's comments, the insipartion came from the official Oracle page https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/ComboBox.html

ComboBox<Line> dashCombo = new ComboBox<>(); 

dashCombo.getStylesheets().add("style.css");                                                                                                      

dashCombo.setStyle("-fx-min-width: 100; -fx-max-width: 100; -fx-pref-width: 100; "

        + "-fx-min-height: 15; -fx-pref-height: 15; -fx-max-height: 15;"); 

initDashLineCombo(dashCombo, common.General.DASHUNIT, (numberCoils - i), colCombo); 





public static void initDashLineCombo(ComboBox<Line> cb, ObservableList<int> list, int i, ColorPicker cp)

{        



    for(int j = 0; j < list.size(); j++) // cycle over the list and generate a line with dashing defined by list

    {     

    int dash = list.get(j);   

    String dashString = " ";

        for(int k : dash) 

        dashString += k + " "; 

        Line line = new Line(25, 0, 95, 0);

        line.setStrokeWidth(2); line.strokeProperty().bind(cp.valueProperty());

        line.setStyle("-fx-stroke-dash-array:" + dashString + ";");    

    cb.getItems().add(line);    

    }     

    cb.getSelectionModel().clearAndSelect(i-1);



        cb.setCellFactory(new Callback<ListView<Line>, ListCell<Line>>() 

        {

        @Override public ListCell<Line> call(ListView<Line> p) 

        {

            return new ListCell<Line>() {

                private final Line line;

                    { 

                        setContentDisplay(ContentDisplay.GRAPHIC_ONLY); 

                        line = new Line(0, 0, 70, 0);

                        line.setStrokeWidth(2);

                        line.strokeProperty().bind(cp.valueProperty());

                    } // end Line

                @Override protected void updateItem(Line item, boolean empty) 

                    {   

                        super.updateItem(item, empty);

                        if (item == null || empty) {   

                                setGraphic(null);

                            }

                        else {

                            line.setStyle(item.getStyle());

                            setGraphic(line); 

                            setItem(line);

                        }

                    }  // end updateItem()

                  }; // end ListCell

            } // end call()

        }); // end setCellFactory

}

enter image description here

enter image description here