如果不需要如图所示的时序控制here,您只需安装Tooltip在封闭的Canvas和杠杆Shape::contains如下所示调整文本。
node.setOnMouseMoved(e -> {
tooltips.forEach((color, bounds) -> {
if (bounds.contains(e.getX(), e.getY())) {
tooltip.setText(color.toString());
}
});
});
按照建议here,Java 9 及更高版本提供了对Tooltip通过属性计时showDelay
and showDuration
.
说明了类似的方法here对于摇摆。
import javafx.application.Application;
import javafx.scene.shape.Rectangle;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.control.Tooltip;
import javafx.scene.layout.StackPane;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.stage.Stage;
import java.util.HashMap;
import java.util.Map;
/**
* @see https://stackoverflow.com/a/53785468/230513
* @see https://stackoverflow.com/a/53753537/230513
*/
public class CanvasTooltipDemo extends Application {
@Override
public void start(Stage stage) throws Exception {
StackPane root = new StackPane();
Scene sc = new Scene(root, 400, 400);
stage.setScene(sc);
Canvas canvas = new Canvas(200, 200);
root.getChildren().add(canvas);
Map<Color, Rectangle> tooltips = new HashMap<>();
tooltips.put(Color.RED, new Rectangle(0, 0, 100, 100));
tooltips.put(Color.BLUE, new Rectangle(100, 0, 100, 100));
tooltips.put(Color.YELLOW, new Rectangle(0, 100, 100, 100));
tooltips.put(Color.GREEN, new Rectangle(100, 100, 100, 100));
GraphicsContext gc = canvas.getGraphicsContext2D();
tooltips.forEach((color, bounds) -> {
gc.setFill(color);
gc.fillRect(bounds.getX(), bounds.getY(), bounds.getWidth(), bounds.getHeight());
});
setToolTips(canvas, tooltips);
stage.show();
}
private void setToolTips(Node node, Map<Color, Rectangle> tooltips) {
Tooltip tooltip = new Tooltip();
Tooltip.install(node, tooltip);
node.setOnMouseMoved(e -> {
tooltips.forEach((color, bounds) -> {
if (bounds.contains(e.getX(), e.getY())) {
tooltip.setText(color.toString());
}
});
});
node.setOnMouseExited(e -> {
tooltip.hide();
});
}
public static void main(String[] args) {
Application.launch(args);
}
}