示例解决方案
运行下面的程序并滚动或向上滑动以显示玻璃窗格。
该程序的目的只是对所涉及的技术进行采样,而不是充当霜冻效果的通用库。
import javafx.animation.*;
import javafx.application.Application;
import javafx.beans.property.*;
import javafx.geometry.Rectangle2D;
import javafx.scene.*;
import javafx.scene.Node;
import javafx.scene.control.Label;
import javafx.scene.effect.*;
import javafx.scene.image.*;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;
// slides a frost pane in on scroll or swipe up; slides it out on scroll or swipe down.
public class Frosty extends Application {
private static final double W = 330;
private static final double H = 590;
private static final double BLUR_AMOUNT = 60;
private static final Duration SLIDE_DURATION = Duration.seconds(0.4);
private static final double UPPER_SLIDE_POSITION = 100;
private static final Effect frostEffect =
new BoxBlur(BLUR_AMOUNT, BLUR_AMOUNT, 3);
@Override public void start(Stage stage) {
DoubleProperty y = new SimpleDoubleProperty(H);
Node background = createBackground();
Node frost = freeze(background, y);
Node content = createContent();
content.setVisible(false);
Scene scene = new Scene(
new StackPane(
background,
frost,
content
)
);
stage.setScene(scene);
stage.show();
addSlideHandlers(y, content, scene);
}
// create a background node to be frozen over.
private Node createBackground() {
Image backgroundImage = new Image(
getClass().getResourceAsStream("ios-screenshot.png")
);
ImageView background = new ImageView(backgroundImage);
Rectangle2D viewport = new Rectangle2D(0, 0, W, H);
background.setViewport(viewport);
return background;
}
// create some content to be displayed on top of the frozen glass panel.
private Label createContent() {
Label label = new Label("The overlaid text is clear and the background below is frosty.");
label.setStyle("-fx-font-size: 25px; -fx-text-fill: midnightblue;");
label.setEffect(new Glow());
label.setMaxWidth(W - 20);
label.setWrapText(true);
return label;
}
// add handlers to slide the glass panel in and out.
private void addSlideHandlers(DoubleProperty y, Node content, Scene scene) {
Timeline slideIn = new Timeline(
new KeyFrame(
SLIDE_DURATION,
new KeyValue(
y,
UPPER_SLIDE_POSITION
)
)
);
slideIn.setOnFinished(e -> content.setVisible(true));
Timeline slideOut = new Timeline(
new KeyFrame(
SLIDE_DURATION,
new KeyValue(
y,
H
)
)
);
scene.setOnSwipeUp(e -> {
slideOut.stop();
slideIn.play();
});
scene.setOnSwipeDown(e -> {
slideIn.stop();
slideOut.play();
content.setVisible(false);
});
// scroll handler isn't necessary if you have a touch screen.
scene.setOnScroll((ScrollEvent e) -> {
if (e.getDeltaY() < 0) {
slideOut.stop();
slideIn.play();
} else {
slideIn.stop();
slideOut.play();
content.setVisible(false);
}
});
}
// create a frosty pane from a background node.
private StackPane freeze(Node background, DoubleProperty y) {
Image frostImage = background.snapshot(
new SnapshotParameters(),
null
);
ImageView frost = new ImageView(frostImage);
Rectangle filler = new Rectangle(0, 0, W, H);
filler.setFill(Color.AZURE);
Pane frostPane = new Pane(frost);
frostPane.setEffect(frostEffect);
StackPane frostView = new StackPane(
filler,
frostPane
);
Rectangle clipShape = new Rectangle(0, y.get(), W, H);
frostView.setClip(clipShape);
clipShape.yProperty().bind(y);
return frostView;
}
public static void main(String[] args) { launch(args); }
}
源图片
将此图像与 Java 源并行保存为名为的文件ios-screenshot.png
并让您的构建系统将其复制到构建的二进制输出的目标目录。
附加问题的答案
“JDK 8”,这会是这个的要求吗?
上面的示例代码是针对 JDK 8 编写的。通过用匿名内部类替换 lambda 调用将其移植回 JDK 7 非常简单。
一般来说,Java 7 对于 JavaFX 工作来说已经相当过时了。我建议您尽早升级以使用 Java 8 最低版本。
用参数启动你的窗格
对于大多数父节点来说更方便的构造函数是Java 8 功能 http://docs.oracle.com/javase/8/javafx/api/javafx/scene/layout/StackPane.html#StackPane-javafx.scene.Node...-。您可以轻松转换 Java 8 格式:
StackPane stack = new StackPane(child1, child2);
对于 Java 7:
StackPane stack = new StackPane();
stack.getChildren().setAll(child1, child2);
如果桌面位于结霜的窗格后面,这会起作用吗?
不直接,您可以为此创建一个新问题。
更新:相关问题
用户创建:JavaFX 对背景的影响 https://stackoverflow.com/questions/22663681/javafx-effect-on-background允许磨砂效果应用于桌面背景上的窗口。
另一位用户创建了:如何创建仅在边框上有阴影的 JavaFX 透明舞台? https://stackoverflow.com/questions/25534204/how-do-i-create-a-javafx-transparent-stage-with-shadows-on-only-the-border在此窗口周围应用光晕阴影效果。