While FXML is a convenient way to define the structure of an application's user interface, it does not provide a way to implement an application's behavior. The HBox pane has one child, a Button with text property set to Sign in and an onAction property set to handleSubmitButtonAction(). The HBox pane is added to the grid in column 1, row 4. The alignment property is set to bottom_right, which positions a node at the bottom of the space vertically and at the right edge of the space horizontally. Then, when you run the application, you see the lines for the grid columns and rows as well as the gap properties, as shown in Figure 4-2.Īn HBox pane is needed to set an alignment for the button that is different from the default alignment applied to the other controls in the GridPane layout. In this case, set the gridLinesVisible property to true by adding the statement true right after the statement. When working with a grid layout, you can display the grid lines, which is useful for debugging purposes. Another Label and PasswordField object are created and added to the grid in a similar fashion. The next lines create a Label object with text User Name at column 0, row 1 and a TextField object to the right of it at column 1, row 1. You will need this extra width later in the tutorial when you add a style sheet to increase the font size of the text to 32 points. The lumnSpan attribute is set to 2, making the Welcome title span two columns in the grid. The numbering for rows and columns in the grid starts at zero, and the location of the Text control is set to (0,0), meaning it is in the first column of the first row. The lumnIndex and GridPane.rowIndex attributes correspond to the placement of the Text control in the grid. The first line creates a Text object and sets its text value to Welcome. The padding properties ensure there is a padding around the grid when you make the window smaller.Įxample 4-4 Text, Label, TextField, and Password Field Controls In this example, the grid remains in the center when you grow or shrink the window. The gap properties manage the spacing between the rows and columns, while the padding property manages the space around the edges of the grid pane.Īs the window is resized, the nodes within the grid pane are resized according to their layout constraints. The alignment property changes the default position of the grid from the top left of the scene to the center. The remainder of the code controls the alignment and spacing of the grid pane. The xmlns:fx attribute is always required and specifies the fx namespace. The fx:controller attribute is required when you specify controller-based event handlers in your markup. In this application, the GridPane layout is the root element of the FXML document and as such has two attributes. Right-click Sample.fxml and choose Rename. In the Projects window, right-click SampleController.java and choose Refactor then Rename.Įnter FXMLExampleController, and click Refactor. Rename SampleController.java to FXMLExampleController.java so that the name is more meaningful for this application. This is the controller file for handling the mouse and keyboard input. This is the FXML source file in which you define the user interface. This file takes care of the standard Java code required for an FXML application. The application includes three files:įXMLExample.java. NetBeans IDE opens an FXML project that includes the code for a basic Hello World application. Name the project FXMLExample and click Finish. In the JavaFX application category, choose JavaFX FXML Application. Your first task is to set up a JavaFX FXML project in NetBeans IDE:
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