Emilie Meyer
JavaFX is a package in Java that provides a simple and coherent method for creating graphical user interfaces (GUIs). It includes a variety of layout panes, such as BorderPane, StackPane, GridPane, FlowPane, and TilePane, that enable developers to easily manage the user interface of their JavaFX application. These layout panes can be nested within each other to create more complex GUIs, and JavaFX will automatically reposition and resize the nodes within the layout pane as the window is resized. While nesting panes is possible, it is important to consider the performance implications, especially when dealing with a large number of rows and updates.
| Characteristics | Values |
|---|---|
| Number of panes in one scene | One root pane |
| Layout containers | AnchorPane, VBox, HBox, BorderPane, Stack Pane, Text Flow, Title Pane, Grid Pane, Flow Panel |
| Layout positioning | Vertical and horizontal |
| Layout properties | Padding, spacing, margins, background color |
| Layout management | Automatic repositioning and resizing of nodes when window is resized |
| Performance implications | Poor performance when adding custom-made (fxml) panels to GridPane dynamically |
| Continuous layout | Default is off, but can be set to true to improve user experience |
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JavaFX layout panes
There are several layout panes available in JavaFX:
- BorderPane: This layout pane provides five regions to place nodes: top, bottom, left, right, and center. The regions can be of any size, and if your application does not need one of the regions, you don't need to define it, and no space will be allocated. A border pane is useful for creating a classic layout with a toolbar at the top, a status bar at the bottom, a navigation panel on the left, additional information on the right, and a working area in the center.
- HBox: This layout pane arranges its content nodes horizontally in a single row. The padding, spacing, and style properties can be set to manage the distance between nodes and change the background color.
- VBox: This layout pane arranges its content nodes vertically in a single column. Similar to HBox, the padding, spacing, and margin properties can be set to manage the distance between nodes and add additional space.
- AnchorPane: This layout pane allows you to anchor nodes to the top, bottom, left side, or center of the pane.
- GridPane: This layout pane is suitable for more complex layouts and provides a grid structure to arrange nodes.
- MigPane: This is a third-party layout manager that uses the MigLayout manager. It offers flexibility with different layout modes and constraints for positioning nodes.
It is possible to nest different containers within a JavaFX application to create more complex layouts. However, built-in layout managers, except for GridPane, are basic and may not suit intricate designs. When using nested panes, it is recommended to create a simple prototype to assess performance, as nested panes can impact the GUI's responsiveness.
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SceneBuilder application
Scene Builder is a visual layout tool that allows users to design JavaFX application user interfaces without coding. It is a part of the JavaFX ecosystem and works with official controls, community projects, and Gluon offerings such as Gluon Mobile, Gluon Desktop, and Gluon CloudLink. Scene Builder is free and open-source, and the latest version, Scene Builder 23.0.1, can be used with Java 21 and higher.
One of the key features of Scene Builder is its drag-and-drop functionality, which enables users to quickly create user interfaces by dragging UI components to a work area, modifying their properties, and applying style sheets. This results in the automatic generation of FXML code for the layout in the background. FXML is an XML-based markup language that allows for the separate definition of an application's user interface and logic.
Scene Builder also offers seamless integration with Java projects. The FXML file created in Scene Builder can be combined with a Java project by binding the UI to the application's logic. This integration provides a straightforward method for prototyping user interfaces and applying animations and effects for more advanced designs.
Additionally, Scene Builder can be used in conjunction with any Java IDE, particularly NetBeans IDE, which offers tighter integration. This integration with NetBeans allows for a seamless workflow where changes made to the FXML code in NetBeans are reflected in the Scene Builder project, and vice versa. At any stage of the project, users can preview the user interface as it will appear when deployed, providing a clear and uninterrupted view.
Scene Builder is a self-contained application, bundled with its own copy of the JRE, and is supported on Windows, Mac OS X, and Linux. It empowers developers to design and build sophisticated JavaFX user interfaces efficiently, making it a valuable tool in the Java development landscape.
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Split panes
JavaFX provides several layout panes for the easy setup and management of classic layouts such as rows, columns, stacks, and tiles. The layout container classes, or panes, are available with the JavaFX SDK. Layout panes can be used to easily manage the user interface for a JavaFX application.
The JavaFX application can manually lay out the UI by setting the position and size properties for each UI element. However, an easier option is to make use of layout panes. As a window is resized, the layout pane automatically repositions and resizes the nodes that it contains according to the properties for the nodes.
The BorderPane layout pane provides five regions in which to place nodes: top, bottom, left, right, and center. The regions can be any size, and if your application does not need one of the regions, you do not need to define it and no space is allocated for it. A border pane is useful for the classic look of a toolbar at the top, a status bar at the bottom, a navigation panel on the left, additional information on the right, and a working area in the center.
The HBox and VBox panes allow you to manage the distance between the nodes and the edges of the pane. Spacing can be set to manage the distance between the nodes. Margins can be set to add additional space around individual controls.
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BorderPane
JavaFX is a software platform for creating and delivering desktop applications, and it includes a media engine and a web engine for handling audio, video, and web content. JavaFX applications can be created using the JavaFX SDK, which provides several layout panes for easy setup and management of classic layouts such as rows, columns, stacks, and tiles. One of these layout panes is the BorderPane.
The BorderPane class is a part of JavaFX and is used to lay out its children in top, bottom, center, left, and right positions. The BorderPane layout pane provides five regions in which to place nodes: top, bottom, left, right, and center. The regions can be any size, and if your application does not need one of the regions, you do not need to define it, and no space will be allocated for it.
The BorderPane class contains five properties: bottom, center, left, right, and top. Each of these properties is of Node type and represents the node placed at that position in the BorderPane. For example, the bottom property represents the node placed at the bottom of the BorderPane, and you can set the value to this property using the setter method setBottom().
The BorderPane can be useful for creating a classic look with a toolbar at the top, a status bar at the bottom, a navigation panel on the left, additional information on the right, and a working area in the center.
Java
Import javafx.application.Application;
Import javafx.scene.Scene;
Import javafx.scene.layout.BorderPane;
Import javafx.stage.Stage;
Public class BorderPaneExample extends Application {
@Override
Public void start(Stage stage) {
// Instantiating the BorderPane class
// Setting the top, bottom, center, right, and left nodes to the pane
BPane.setTop(new TextField("Top"));
BPane.setBottom(new TextField("Bottom"));
BPane.setCenter(new TextField("Center"));
BPane.setRight(new TextField("Right"));
BPane.setLeft(new TextField("Left"));
// Creating a scene object
Scene scene = new Scene(bPane);
// Setting the title to the Stage
Stage.setTitle("BorderPane Example");
// Adding the scene to the stage
Stage.setScene(scene);
// Displaying the contents of the stage
Stage.show();
}
Public static void main(String[] args) {
Launch(args);
}
}
In this example, we first import the necessary classes from the JavaFX library. We then define a class named `BorderPaneExample` that extends the "Application" class. In the `start` method, we instantiate a "BorderPane" object and set the top, bottom, center, right, and left nodes using the respective setter methods. We then create a "Scene" object and set the "BorderPane" as its root node. Next, we set the title of the "Stage" and add the "Scene" to it. Finally, we display the contents of the "Stage" by calling the "show" method.
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Stack panes
JavaFX provides several layout panes for the easy setup and management of classic layouts such as rows, columns, stacks, and tiles. The StackPane class is a part of JavaFX and lays out its children in the form of a stack. The new node is placed on top of the previous node in a StackPane. The z-order of the children is defined by the order of the children's list, with the 0th child being at the bottom and the last child on top. StackPane will attempt to resize each child to fill its content area. If the child cannot be sized to fill the StackPane, it will be aligned within the area using the alignment property, which defaults to Pos.CENTER.
A StackPane's parent will resize the StackPane within the StackPane's resizable range during the layout. By default, the StackPane computes this range based on its content. A StackPane's unbounded maximum width and height indicate to the parent that it may be resized beyond its preferred size to fill the assigned space. StackPane provides properties for setting the size range directly.
StackPane creates a StackPane layout with default CENTER alignment. The parameters are the initial set of children for this pane. StackPane lays out each managed child regardless of the child's visible property value. Unmanaged children are ignored. StackPane may be styled with backgrounds and borders using CSS.
StackPane stack = new StackPane();
Stack.getChildren().addAll(new Rectangle(100,100,Color.BLUE), new Label("Go!"));
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Frequently asked questions
Yes, panes can be nested in Java. JavaFX, for example, offers various layout panes for the easy setup and management of classic layouts such as rows, columns, stacks, and tiles.
The scene itself can only have one root pane. So, if you want two panes in the scene, you need three: a root pane and two child panes.
Some layout panes in JavaFX include BorderPane, StackPane, GridPane, FlowPane, TilePane, and AnchorPane.
When using nested panes in Java, it is important to consider the performance implications. While JavaFX handles nested panes better than Swing, creating a prototype can help address specific concerns. Additionally, proper use of layout panes, such as GridPane, can improve performance.
