From: Debayan Sutradhar <debayansutradhar3@gmail.com>
Date: Tue, 22 Dec 2020 01:43:59 +0530
Subject: Implemented Custom combo box
---
Implemented Custom combo box
---


--- 'a/src/main/java/com/StreamPi/Util/ComboBox/StreamPiComboBox.java'
+++ b/src/main/java/com/StreamPi/Util/ComboBox/StreamPiComboBox.java
@@ -1,14 +1,24 @@
 package com.StreamPi.Util.ComboBox;
 
+import java.util.ArrayList;
 import java.util.List;
 
+import com.StreamPi.Util.FormHelper.SpaceFiller;
+import com.StreamPi.Util.FormHelper.SpaceFiller.FillerType;
+
+import org.kordamp.ikonli.javafx.FontIcon;
+
 import javafx.scene.control.Label;
+import javafx.scene.control.ScrollPane;
+import javafx.scene.control.ToggleButton;
+import javafx.scene.control.ScrollPane.ScrollBarPolicy;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.StackPane;
+import javafx.scene.layout.VBox;
 
-public class StreamPiComboBox extends HBox
+public class StreamPiComboBox<T> extends HBox
 {
-    private List options;
+    private List<T> options;
 
     private static StackPane stackPaneParent;
 
@@ -18,10 +28,11 @@ public class StreamPiComboBox extends HB
         stackPaneParent.getStyleClass().add("combobox_pane_parent");
     }
     
-    public StreamPiComboBox(List options)
+    public StreamPiComboBox(List<T> options)
     {
         setup();
-        this.options = options;
+
+        setOptions(options);
     }
 
     public StreamPiComboBox()
@@ -29,23 +40,127 @@ public class StreamPiComboBox extends HB
         setup();
     }
 
-    private Label currentSelected;
+    private Label currentSelectedLabel;
     private void setup()
     {
-        getStyleClass().add("streampi_combo_box");
+        buttons = new ArrayList<>();
+
+        getStyleClass().add("combo_box");
+        setOnMouseClicked(event->show());
+
+        currentSelectedLabel = new Label();
 
-        getChildren().add()
+        FontIcon fontIcon = new FontIcon();
+        fontIcon.getStyleClass().add("combo_box_drop_down_icon");
+
+        getChildren().addAll(
+            currentSelectedLabel,
+            new SpaceFiller(FillerType.HBox),
+            fontIcon
+        );
     }
 
-    public void setOptions(List options)
+    public void setOptions(List<T> options)
     {
         this.options = options;
+        setCurrentSelectedItemIndex(0);
+    }
+
+
+    private int currentIndex = 0;
+    private List<ToggleButton> buttons;
+
+    public ScrollPane getPopupScrollPane()
+    {
+        buttons.clear();
+
+        ScrollPane scrollPane = new ScrollPane();
+        scrollPane.setHbarPolicy(ScrollBarPolicy.NEVER);
+        scrollPane.setVbarPolicy(ScrollBarPolicy.AS_NEEDED);
+
+        scrollPane.getStyleClass().add("combo_box_popup");
+
+        VBox vBox = new VBox();
+        vBox.getStyleClass().add("combo_box_popup_vbox");
+        vBox.prefWidthProperty().bind(scrollPane.widthProperty().subtract(10));
+    
+        scrollPane.setContent(vBox);
+
+        for(int i = 0;i<options.size();i++)
+        {
+            T eachOptionObj = options.get(i);
+            String displayText = streamPiComboBoxFactory.getOptionDisplayText(eachOptionObj);
+
+            ToggleButton optionButton = new ToggleButton(displayText);
+            optionButton.setSelected(i == currentIndex);
+            optionButton.setUserData(i);
+            optionButton.setOnAction(event->
+            {
+                setCurrentSelectedItemIndex((int) optionButton.getUserData());
+
+                if(streamPiComboBoxListener != null)
+                    streamPiComboBoxListener.onNewItemSelected(options.get(currentIndex));
+                
+                destroy();
+            });
+            vBox.getChildren().addAll(optionButton);
+            buttons.add(optionButton);
+        }
+
+        return scrollPane;
+    }
+
+    public int getCurrentIndex()
+    {
+        return currentIndex;
     }
 
-    public void popup()
+    public T getCurrentSelectedItem()
     {
+        return options.get(currentIndex);
+    }
+
+    public void setCurrentSelectedItemIndex(int index)
+    {
+        this.currentIndex = index;
 
+        setCurrentSelectedLabelText(streamPiComboBoxFactory.getOptionDisplayText(options.get(index)));
+    }
+
+    public void setCurrentSelectedItem(T object)
+    {
+        setCurrentSelectedItemIndex(options.indexOf(object));
     }
 
-    public void 
+    private void setCurrentSelectedLabelText(String text)
+    {
+        currentSelectedLabel.setText(text);
+    }
+
+    private StreamPiComboBoxListener<T> streamPiComboBoxListener = null;
+
+    public void setStreamPiComboBoxListener(StreamPiComboBoxListener<T> streamPiComboBoxListener)
+    {
+        this.streamPiComboBoxListener = streamPiComboBoxListener;
+    }
+
+    public void show()
+    {
+        stackPaneParent.getChildren().add(getPopupScrollPane());
+        stackPaneParent.toFront();
+        stackPaneParent.setVisible(true);
+    }
+
+    public void destroy()
+    {
+        stackPaneParent.getChildren().clear();
+        stackPaneParent.toBack();
+        stackPaneParent.setVisible(false);
+    }
+
+    private StreamPiComboBoxFactory<T> streamPiComboBoxFactory;
+    public void setStreamPiComboBoxFactory(StreamPiComboBoxFactory<T> streamPiComboBoxFactory)
+    {
+        this.streamPiComboBoxFactory = streamPiComboBoxFactory;
+    }
 }
\ No newline at end of file

--- 'a/src/main/java/com/StreamPi/Util/ComboBox/StreamPiComboBoxFactory.java'
+++ b/src/main/java/com/StreamPi/Util/ComboBox/StreamPiComboBoxFactory.java
@@ -1,6 +1,6 @@
 package com.StreamPi.Util.ComboBox;
 
-public abstract class StreamPiComboBoxFactory
+public abstract class StreamPiComboBoxFactory<T>
 {
-    public abstra
+    public abstract String getOptionDisplayText(T object);
 }
\ No newline at end of file

--- /dev/null
+++ b/src/main/java/com/StreamPi/Util/ComboBox/StreamPiComboBoxListener.java
@@ -0,0 +1,5 @@
+package com.StreamPi.Util.ComboBox;
+
+public abstract class StreamPiComboBoxListener<T> {
+    public abstract void onNewItemSelected(T selectedItem);
+}

--- 'a/src/main/java/module-info.java'
+++ b/src/main/java/module-info.java
@@ -1,9 +1,9 @@
 module com.StreamPi.Util {
 
-    requires org.kordamp.ikonli.javafx;
-    requires org.kordamp.ikonli.fontawesome5;
-    requires javafx.base;
-    requires javafx.controls;
+    requires transitive org.kordamp.ikonli.javafx;
+    requires transitive org.kordamp.ikonli.fontawesome5;
+    requires transitive javafx.base;
+    requires transitive javafx.controls;
 
     exports com.StreamPi.Util.Version;
     exports com.StreamPi.Util.Exception;
@@ -11,4 +11,5 @@ module com.StreamPi.Util {
     exports com.StreamPi.Util.FormHelper;
     exports com.StreamPi.Util.StartAtBoot;
     exports com.StreamPi.Util.Alert;
+    exports com.StreamPi.Util.ComboBox;
 }
\ No newline at end of file