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Today, I will talk to you about how JavaFX adds ContextMenu menus to objects. Many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

When developing desktop programs in JavaFX, we will inevitably encounter the situation of adding right-click menus. Today, we will introduce a general way to add right-click menus.

Right-click menus in JavaFX are all implemented through ContextMenu. First, define GlobalMenu, inherit ContextMenu, and display these functional options. The code looks like this:

Package org.crawler.ui.layout.left;import javafx.scene.control.ContextMenu;import javafx.scene.control.MenuItem;@SuppressWarnings ("restriction") public class GlobalMenu extends ContextMenu {/ * * singleton * / private static GlobalMenu INSTANCE = null; / * Private Constructor * / private GlobalMenu () {MenuItem settingMenuItem = new MenuItem ("set"); MenuItem updateMenuItem = new MenuItem ("update") MenuItem feedbackMenuItem = new MenuItem ("help"); MenuItem aboutMenuItem = new MenuItem ("File"); MenuItem companyMenuItem = new MenuItem ("about"); getItems (). Add (settingMenuItem); getItems (). Add (updateMenuItem); getItems (). Add (companyMenuItem); getItems (). Add (feedbackMenuItem); getItems (). Add (aboutMenuItem) } / * obtain instance * @ return GlobalMenu * / public static GlobalMenu getInstance () {if (INSTANCE = = null) {INSTANCE = new GlobalMenu ();} return INSTANCE;}}

Suppose we need to add a button click event to each Node node of a TreeView. After clicking the button, the menu is displayed, and we can set it as follows.

Public void addRightMenu (TreeView treeView) {treeView.addEventFilter (MouseEvent.MOUSE_CLICKED, new EventHandler () {public void handle (MouseEvent event) {Node node = event.getPickResult () .getIntersectedNode (); / / add a menu to the node object GlobalMenu.getInstance () .show (node, javafx.geometry.Side.BOTTOM, 0,0); String name = (String) ((TreeItem) treeView.getSelectionModel () .getSelectedItem ()) .getValue (); System.out.println ("Node click:" + name);}});}

Well, when we click TreeView, each node will appear the menu shown in the following figure.

After reading the above, do you have any further understanding of how JavaFX adds ContextMenu menus to objects? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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