JavaFX：设置控件的Tooltip

╰半夏微凉° 2024-02-28 02:25 18阅读 0赞

package javafx8.ch06;
    
    import javafx.application.Application;
    import javafx.geometry.Bounds;
    import javafx.geometry.Insets;
    import javafx.geometry.Point2D;
    import javafx.geometry.Pos;
    import javafx.scene.Node;
    import javafx.scene.Scene;
    import javafx.scene.control.Label;
    import javafx.scene.control.Tooltip;
    import javafx.scene.layout.HBox;
    import javafx.stage.Stage;
    import javafx.util.Duration;
    
    /**
     * @copyright 2023-2022
     * @package   javafx8.ch06
     * @file      TooltipAnchoringDemo.java
     * @date      2023-08-24 13:32
     * @author    qiao wei
     * @version   1.0
     * @brief     
     * @history
     */
    public class TooltipAnchoringDemo extends Application {
        
        public TooltipAnchoringDemo() {}
        
        @Override
        public void start(Stage stage) {
            // Initialize tooltip controls
            Label label1 = new Label("TEST1\nTEST1\nTEST1");
            label1.setStyle("-fx-background-color: red;");
            Label label2 = new Label("TEST2\nTEST2\nTEST2");
            label2.setStyle("-fx-background-color: green;");
            Label label3 = new Label("TEST3\nTEST3\nTEST3");
            label3.setStyle("-fx-background-color: blue;");
            
            // Associates the given Tooltip with the given Node.
            CustomTooltip tooltip = CustomTooltip.install("TOOLTIP 1", label1);
            tooltip.setShowDelay(Duration.seconds(0.01));
            CustomTooltip.install("TOOLTIP 2", label2);
            CustomTooltip.install("TOOLTIP 3", label3);
            
            // Set 15px is the amount of horizontal space between each child controls.
            HBox root = new HBox(15, label1, label2, label3);
            
            // 设置容器内控件距离容器边框距离。
            root.setPadding(new Insets(10));
            root.setAlignment(Pos.BOTTOM_RIGHT);
    
            Scene scene = new Scene(root, 300, 180);
            stage.setScene(scene);
            stage.setTitle("Tooltip Demo");
    
            stage.show();
        }
    
        public static void main(String[] args) {
            Application.launch(TooltipAnchoringDemo.class, args);
        }
    }
    
    /**
     * @copyright 2023-2022
     * @package   javafx8.ch06
     * @file      TooltipAnchoringDemo.java
     * @date      2023-08-24 14:38
     * @author    qiao wei
     * @version   1.0
     * @brief     Custom tooltip
     * @history
     */
    class CustomTooltip extends Tooltip {
        
        public CustomTooltip(final String s) {
            super(s);
        }
        
        /**
         * @class   CustomTooltip
         * @date    2023-08-24 14:09
         * @author  qiao wei
         * @version 1.0
         * @brief   Binds control and tooltip
         * @param   message tooltip's message
         * @param   node Binded control
         * @return  
         * @throws
         */
        public static CustomTooltip install(String message, Node node) {
            CustomTooltip tooltip = new CustomTooltip(message);
            tooltip.node = node;
            install(node, tooltip);
            
            return tooltip;
        }
        
        @Override
        protected void show() {
            // Set the new position before showing.
            Point2D anchor = anchor(node);
            setAnchorX(anchor.getX());
            setAnchorY(anchor.getY());
    
            super.show();
        }
        
        /**
         * @class   CustomTooltip
         * @date    2023-08-24 13:42
         * @author  qiao wei
         * @version 1.0
         * @brief   Calculates the anchor point for the tooltip.
         * @param   node The owner of tooltip
         * @return  The anchor position.
         * @throws
         */
        private Point2D anchor(final Node node) {
            // Get the node bounds on the screen.
            final Bounds bounds = node.localToScreen(node.getBoundsInLocal());
            
            // Calculate the opening position based on node bounds for screen bounds.
            final Point2D openPosition = new Point2D(bounds.getMaxX(), bounds.getMaxY() + Y_OFFSET);
            
            return openPosition;
        }
        
        private Node node;
        
        /**
         * Pixel offset from the node in the y-axis to display the tooltip.
         * You can keep it to 0. Normally I don't want to keep it very near to the node.
         */
        private static final int Y_OFFSET = 2;
    }