Sorry for the length post but I wanted to share this first conversation about B4x.
I thought I'd see if ChatGPT knew anything about JavaFX so I asked it:
To which it replied:
As of my last update in September 2021, JavaFX provides a ListView class that is used to display a list of items in a scrollable vertical box. The ListView is part of the JavaFX Controls package and offers various features for displaying and interacting with lists of items. Below is an overview of the structure of a ListView in JavaFX:
This code creates a simple ListView with five items. As the data in the ObservableList changes, the ListView will automatically reflect those changes in its graphical representation. Additionally, users can interact with the ListView by selecting one or multiple items.
Please note that JavaFX might receive updates beyond my last knowledge cutoff in September 2021. Always refer to the official documentation or the latest JavaFX resources for any changes or enhancements to the ListView class.
I got an answer and more.
Then I asked:
And it replied:
Sure! B4X is a suite of cross-platform development tools that allows you to create native apps for Android, iOS, and desktop platforms. It includes B4A (Basic4Android) for Android apps, B4i for iOS apps, and B4J for desktop applications (which is the closest equivalent to JavaFX for desktop development). Below is the equivalent code for the JavaFX ListView example, but this time written in B4J:
To use this code, follow these steps:
Remember to install the B4J IDE and libraries to run and compile B4J projects successfully. Also, ensure you have the latest version of B4J since it may receive updates beyond my last knowledge cutoff in September 2021.
A valiant effort, but not quite right, so I followed up with:
And got:
Apologies for the confusion, and thank you for pointing that out. You are right; the #FullScreen and #IncludeTitle attributes are specific to B4A (Basic4Android) for Android applications, not B4J (Basic4Java) for desktop applications. Also, you are correct that when a ListView (or any View) is added to the B4J designer, it doesn't need to be initialized in code.
Here's the corrected B4J code without the unnecessary attributes and initialization of the ListView:
Again, thank you for the clarification, and I apologize for the oversight. I hope this corrected version helps you in your B4J development.
Just need to move the LoadLayout above the ListView1.add line and it works, apart from the callback, which is not correct but close.
--- End of Chat ---
I know it's simple request, but chatGPT has some knowledge of B4x, it was a fun 5 minutes. I think there could be some potential in this technology.
I thought I'd see if ChatGPT knew anything about JavaFX so I asked it:
To which it replied:
As of my last update in September 2021, JavaFX provides a ListView class that is used to display a list of items in a scrollable vertical box. The ListView is part of the JavaFX Controls package and offers various features for displaying and interacting with lists of items. Below is an overview of the structure of a ListView in JavaFX:
- ListView Class: The ListView class is the main class representing the list view component in JavaFX. It is a subclass of the javafx.scene.control.ListView<T> class, where 'T' is the type of data you want to display in the list. For example, if you want to display a list of Strings, you can create a ListView<String>.
- ObservableList: The data for the ListView is stored in an ObservableList<T> (where 'T' is the same type as used in the ListView). An ObservableList is a special type of list that allows you to observe changes to its content. It is used to dynamically update the ListView whenever the underlying data changes.
- CellFactory and Cell Rendering: The ListView uses a CellFactory to create cells for each item in the list. Cells are the visual representation of the data items in the ListView. The CellFactory is responsible for rendering the data items into a graphical format. You can customize the appearance of the cells by providing a custom cell factory.
- Selection Model: ListView has a SelectionModel, which manages the selection behavior of the ListView. You can control whether multiple items can be selected, and you can listen for changes in the selection to perform actions based on user interactions.
B4X:
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class BasicListViewExample extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
// Sample data for the ListView
ObservableList<String> items = FXCollections.observableArrayList(
"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"
);
ListView<String> listView = new ListView<>(items);
VBox root = new VBox(listView);
Scene scene = new Scene(root, 300, 200);
primaryStage.setTitle("ListView Example");
primaryStage.setScene(scene);
primaryStage.show();
}
}This code creates a simple ListView with five items. As the data in the ObservableList changes, the ListView will automatically reflect those changes in its graphical representation. Additionally, users can interact with the ListView by selecting one or multiple items.
Please note that JavaFX might receive updates beyond my last knowledge cutoff in September 2021. Always refer to the official documentation or the latest JavaFX resources for any changes or enhancements to the ListView class.
I got an answer and more.
Then I asked:
And it replied:
Sure! B4X is a suite of cross-platform development tools that allows you to create native apps for Android, iOS, and desktop platforms. It includes B4A (Basic4Android) for Android apps, B4i for iOS apps, and B4J for desktop applications (which is the closest equivalent to JavaFX for desktop development). Below is the equivalent code for the JavaFX ListView example, but this time written in B4J:
B4X:
#Region Project Attributes
#MainFormWidth: 600
#MainFormHeight: 400
#End Region
#Region Activity Attributes
#FullScreen: False
#IncludeTitle: True
#End Region
Sub Process_Globals
Private fx As JFX
Private MainForm As Form
Private ListView1 As ListView
End Sub
Sub AppStart (Form1 As Form, Args() As String)
MainForm = Form1
MainForm.SetFormStyle("UNIFIED")
MainForm.Title = "ListView Example"
ListView1.Initialize("ListView1")
ListView1.Items.AddAll(Array("Item 1", "Item 2", "Item 3", "Item 4", "Item 5"))
MainForm.RootPane.LoadLayout("Layout1") ' Load the layout from the designer.
MainForm.Show
End Sub
Sub ListView1_ItemClick (Index As Int, Value As Object)
' Handle the item click event here.
Log($"Clicked item at index: ${Index}, Value: ${Value}"$)
End SubTo use this code, follow these steps:
- Create a new B4J project.
- In the designer, add a ListView control (named ListView1) to the layout.
- Set the FullScreen and IncludeTitle attributes to match those in the code above.
- Load the code provided in the "Sub AppStart" and "Sub ListView1_ItemClick" into your B4J project.
- Run the project to see the ListView with the sample items.
Remember to install the B4J IDE and libraries to run and compile B4J projects successfully. Also, ensure you have the latest version of B4J since it may receive updates beyond my last knowledge cutoff in September 2021.
A valiant effort, but not quite right, so I followed up with:
And got:
Apologies for the confusion, and thank you for pointing that out. You are right; the #FullScreen and #IncludeTitle attributes are specific to B4A (Basic4Android) for Android applications, not B4J (Basic4Java) for desktop applications. Also, you are correct that when a ListView (or any View) is added to the B4J designer, it doesn't need to be initialized in code.
Here's the corrected B4J code without the unnecessary attributes and initialization of the ListView:
B4X:
#Region Project Attributes
#MainFormWidth: 600
#MainFormHeight: 400
#End Region
Sub Process_Globals
Private fx As JFX
Private MainForm As Form
Private ListView1 As ListView
End Sub
Sub AppStart (Form1 As Form, Args() As String)
MainForm = Form1
MainForm.Title = "ListView Example"
ListView1.Items.AddAll(Array As Object("Item 1", "Item 2", "Item 3", "Item 4", "Item 5"))
MainForm.RootPane.LoadLayout("Layout1") ' Load the layout from the designer.
MainForm.Show
End Sub
Sub ListView1_ItemClick (Index As Int, Value As Object)
' Handle the item click event here.
Log($"Clicked item at index: ${Index}, Value: ${Value}"$)
End SubAgain, thank you for the clarification, and I apologize for the oversight. I hope this corrected version helps you in your B4J development.
Just need to move the LoadLayout above the ListView1.add line and it works, apart from the callback, which is not correct but close.
--- End of Chat ---
I know it's simple request, but chatGPT has some knowledge of B4x, it was a fun 5 minutes. I think there could be some potential in this technology.
Last edited:
