我正在尝试使用鼠标滚轮进行缩放。放大效果完美。但是当我滚动得更小时，它不会无限缩小。这意味着，在 Pane 达到特定大小后，它不会继续缩小。这是我的方法:
package application;
import javafx.application.Application;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.shape.SVGPath;
import javafx.scene.transform.Affine;
import javafx.stage.Stage;
public class fab extends Application {
private Stage stage;
private Pane pane;
private BorderPane borderPane;
private Scene scene;
private Affine affine = new Affine();
private ScrollPane scrollPane;
private String coords = "M545.296,92.562c-1.399-1.758-2.823-3.852-4.732-4.777c-8.87-4.309-17.83-8.47-26.933-12.256 c-4.268-1.775-7.49-4.035-8.735-8.65c-0.269-1-0.755-2.084-1.473-2.799c-4.492-4.455-4.533-4.447,0.808-7.854 c0.698-0.445,1.567-0.624,1.73-0.685c-0.412-2.179-0.637-3.901-1.102-5.557c-0.225-0.804-0.755-1.681-1.408-2.179 c-3.211-2.419-7.021-4.264-9.629-7.193c-2.566-2.885-5.186-2.742-8.307-2.448c-1.044,0.098-2.513,0.13-3.146-0.473 c-3.672-3.55-8.731-1.82-13.031-3.321c-3.75-1.31-8.928,1.493-13.477,2.448c-0.633,0.13-1.399,0.293-1.946,0.065 c-7.797-3.284-14.378-1.281-19.689,4.859c-0.262,1.359-0.625,2.905-1.596,3.66c-3.696,2.864-7.854,5.182-11.326,8.274 c-2.424,2.158-4.981,5.01-5.708,7.984c-0.73,2.995-2.171,4.023-4.521,4.77c-2.529,0.8-4.859,1.579-4.949,4.953 c-0.024,0.841-1.562,1.55-1.885,2.497c-0.682,1.995-1.098,4.096-1.473,6.177c-0.208,1.154,0.253,2.554-0.241,3.505 c-1.758,3.415-3.888,6.638-5.699,10.024c-1.588,2.958-4.48,6.328-3.995,9.004c0.588,3.231-0.216,6.389,0.531,9.335 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@Override
public void start(Stage stage) throws Exception {
this.stage = stage;
Button button = new Button("Button");
pane = new Pane();
pane.getChildren().add(button);
borderPane = new BorderPane();
stage.setTitle("Circle");
scrollPane = new ScrollPane(new Group(pane));
borderPane.setCenter(scrollPane);
SVGPath camel = new SVGPath();
camel.setContent(coords);
pane.getChildren().add(camel);
pane.getTransforms().add(affine);
scene = new Scene(borderPane, 640, 640);
this.zoom(pane);
stage.setScene(scene);
stage.show();
}
public void zoom( Pane pane) {
pane.setOnScroll(
new EventHandler<ScrollEvent>() {
@Override
public void handle(ScrollEvent event) {
double zoomFactor = 1.05;
double deltaY = event.getDeltaY();
if (deltaY < 0){
zoomFactor = 0.95;
}
pane.setScaleX(pane.getScaleX() * zoomFactor);
pane.setScaleY(pane.getScaleY() * zoomFactor);
event.consume();
}
});
}
public static void main(String[] args) {
launch(args);
}
你能解释一下我做错了什么吗？
形状在 Pane 上。当 Pane 达到其原来大小的 25% 左右时，缩放功能停止工作，我不知道为什么。
最佳答案
你的问题看起来很简单，但具有欺骗性。我添加了行
pane.setBackground(new Background(new BackgroundFill(Color.AQUAMARINE, null, null)));
到你的代码，现在一切都应该清楚了:
But when I scroll smaller, it doesn't shrinks indefinitly.
您猜对了:您正在缩小注册为监听鼠标点击的面板，直到鼠标不再位于面板上，因此缩放停止。
修复很简单——注册场景而不是面板来监听事件:
scene.setOnScroll(new EventHandler<ScrollEvent>() { /*...*/ });
正如我在另一个 answer 中指出的那样，在生产阶段为组件着色确实有助于解决这些问题。
关于java - 在 JavaFX 中使用鼠标滚轮缩放，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47608516/