Question

我正在寻找一种基于某些全局属性动态控制JavaFX应用程序中工具提示显示的方法。假设在我的应用程序中有1000个安装了工具提示的节点。我有一个布尔属性来设置工具提示打开/关闭。如何以更可行的方式实现这一目标？只是让您知道，我知道工具提示的安装/卸载功能。我不想每次用户切换设置属性时都对所有1000个节点执行此操作。

我最初的想法是扩展Tooltip控件，并为“ onShowing”设置一些事件过滤器，如果设置属性为false，它将消耗事件。但这并没有停止显示工具提示。即使我消费了事件，也会显示工具提示。

或者，我也尝试设置事件调度程序。但这也没有用。下面是我尝试处理的代码。

非常感谢您提供任何帮助。

import javafx.event.Event;
import javafx.event.EventDispatcher;
import javafx.scene.control.Tooltip;
import javafx.stage.WindowEvent;

public class CustomTooltip extends Tooltip {

    public static boolean SHOW_TOOLTIP = false;

    public CustomTooltip(String txt){
        super(txt);

        // Approach #1
        addEventFilter(WindowEvent.WINDOW_SHOWING, e->{
            if (!SHOW_TOOLTIP) {
                e.consume();
            }
        });

        // Approach #2
        //setEventDispatcher();
    }

    private void setEventDispatcher() {
        final EventDispatcher oed = getEventDispatcher();
        final EventDispatcher ned = (event, tail) -> {
            Event r = null;
            if (!SHOW_TOOLTIP) {
                event.consume();
            } else{
                r = oed.dispatchEvent(event, tail);
            }
            return r;
        };
        setEventDispatcher(ned);
    }
}

下面是演示我的要求的完整示例/演示。

import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventDispatcher;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;

public class TooltipDisableDemo extends Application {
    public static boolean SHOW_TOOLTIP = false;


    @Override
    public void start(Stage stage) throws Exception {
        StackPane root = new StackPane();
        Scene sc = new Scene(root, 700, 700);
        stage.setScene(sc);
        stage.setTitle("Tooltips Disable Demo");
        stage.show();

        CheckBox showToolTip = new CheckBox("Enable tooltip displaying");
        showToolTip.selectedProperty().addListener((obs, old, show) -> SHOW_TOOLTIP = show);
        showToolTip.setSelected(true);

        TabPane tabPane = new TabPane();
        for (int i = 1; i < 11; i++) {
            Tab tab = new Tab("Tab " + i);
            tab.setClosable(false);
            FlowPane fp = new FlowPane();
            fp.setPadding(new Insets(10));
            fp.setHgap(15);
            fp.setVgap(15);
            for (int j = 1; j < 51; j++) {
                StackPane sp = new StackPane();
                sp.setStyle("-fx-background-color: gray");
                sp.setPadding(new Insets(0,5,0,5));
                sp.getChildren().add(new Label("SP T"+i+" - "+j));
                Tooltip.install(sp, new CustomTooltip("This is stack pane " + j + " in Tab " + i));

                Button btn = new Button("Button T"+i+" - "+j);
                btn.setTooltip(new CustomTooltip("This is button " + j + " in Tab " + i));
                fp.getChildren().addAll(sp, btn);
            }
            tab.setContent(fp);
            tabPane.getTabs().add(tab);
        }
        VBox.setVgrow(tabPane, Priority.ALWAYS);

        VBox vb = new VBox();
        vb.setSpacing(10);
        vb.setPadding(new Insets(10));
        vb.getChildren().addAll(showToolTip,tabPane);
        root.getChildren().add(vb);
    }

    public static void main(String[] args) {
        Application.launch(args);
    }

    /**
     * Custom tooltip implementation.
     */
    class CustomTooltip extends Tooltip {

        public CustomTooltip(String txt){
            super(txt);

            // Approach #1
            addEventFilter(WindowEvent.WINDOW_SHOWING, e->{
                if (!SHOW_TOOLTIP) {
                    e.consume();
                }
            });

            // Approach #2
            //setEventDispatcher();
        }

        private void setEventDispatcher() {
            final EventDispatcher oed = getEventDispatcher();
            final EventDispatcher ned = (event, tail) -> {
                Event r = null;
                if (!SHOW_TOOLTIP) {
                    event.consume();
                } else{
                    r = oed.dispatchEvent(event, tail);
                }
                return r;
            };
            setEventDispatcher(ned);
        }
    }
}

Answer 1

如果要将Tooltip安装在控件上，则始终可以进行绑定（例如，不能将其用于Pane）。

public final class ToolTipManager {
    public ToolTipManager INSTANCE; // Some singleton implementation
    public final ReadOnlyBooleanProperty enabledProperty() { return enabled.getReadOnlyProperty(); }

   // ...
}

public class MyController {
    @FXML private Button button;
    private Tooltip myTooltip;

    @FXML private void initialize() {
        button.tooltipProperty().bind(
            Bindings.when(ToolTipManager.INSTANCE.enabledProperty())
                    .then(myTooltip)
                    .otherwise((Tooltip)null));
    }
}

Answer 2

根据kleopatra的建议，以下是最终的工作演示。我将覆盖受保护的方法show（），并有条件地调用super方法以显示工具提示。

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TooltipDisableDemo extends Application {
    public static boolean SHOW_TOOLTIP = false;


    @Override
    public void start(Stage stage) throws Exception {
        StackPane root = new StackPane();
        Scene sc = new Scene(root, 700, 700);
        stage.setScene(sc);
        stage.setTitle("Tooltips Disable Demo");
        stage.show();

        CheckBox showToolTip = new CheckBox("Enable tooltip displaying");
        showToolTip.selectedProperty().addListener((obs, old, show) -> SHOW_TOOLTIP = show);
        showToolTip.setSelected(true);

        TabPane tabPane = new TabPane();
        for (int i = 1; i < 11; i++) {
            Tab tab = new Tab("Tab " + i);
            tab.setClosable(false);
            FlowPane fp = new FlowPane();
            fp.setPadding(new Insets(10));
            fp.setHgap(15);
            fp.setVgap(15);
            for (int j = 1; j < 51; j++) {
                StackPane sp = new StackPane();
                sp.setStyle("-fx-background-color: gray");
                sp.setPadding(new Insets(0, 5, 0, 5));
                sp.getChildren().add(new Label("SP T" + i + " - " + j));
                Tooltip.install(sp, new CustomTooltip("This is stack pane " + j + " in Tab " + i));

                Button btn = new Button("Button T" + i + " - " + j);
                btn.setTooltip(new CustomTooltip("This is button " + j + " in Tab " + i));
                fp.getChildren().addAll(sp, btn);
            }
            tab.setContent(fp);
            tabPane.getTabs().add(tab);
        }
        VBox.setVgrow(tabPane, Priority.ALWAYS);

        VBox vb = new VBox();
        vb.setSpacing(10);
        vb.setPadding(new Insets(10));
        vb.getChildren().addAll(showToolTip, tabPane);
        root.getChildren().add(vb);
    }

    public static void main(String[] args) {
        Application.launch(args);
    }

    /**
     * Custom tooltip implementation.
     */
    class CustomTooltip extends Tooltip {
        public CustomTooltip() {
            super();
        }

        public CustomTooltip(String txt) {
            super(txt);
        }

        @Override
        protected void show() {
            if (SHOW_TOOLTIP) {
                super.show();
            }
        }
    }
}

如何在JavaFX应用程序中动态控制工具提示显示

2 个答案: