java JavaFx：如何将 ImageView 放入 ListView
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/33592308/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
JavaFx : How to put ImageView inside ListView
提问by Justine Mackay
I've been searching some threads about JavaFx ListView still it's hard to look for a simple yet easy solution for putting a JavaFx ImageView inside JavaFx ListView. I am trying to create a chat application using JavaFx framework. at the photo it should look like that.This is not duplicate because the other thread is vague for a beginner like me. ListView with imageview inside
我一直在搜索有关 JavaFx ListView 的一些线程，但仍然很难找到一个简单而简单的解决方案来将 JavaFx ImageView 放入 JavaFx ListView。我正在尝试使用 JavaFx 框架创建聊天应用程序。在照片上它应该看起来像那样。这不是重复的，因为另一个线程对于像我这样的初学者来说是模糊的。里面有 imageview 的 ListView
I tried something like this. I'm totally noob to this thanks in advance!
我试过这样的事情。我完全是菜鸟，提前致谢！
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class Main extends Application {
ImageView imageView = new ImageView();
Image image = new Image(Main.class.getResourceAsStream("bell.jpg"));
ListView<String> list = new ListView<String>();
ObservableList<String> data = FXCollections.observableArrayList(
"chocolate", "salmon", "gold", "coral", "darkorchid",
"darkgoldenrod", "lightsalmon", "black", "rosybrown", "blue",
"blueviolet", "brown");
Image pic;
@Override
public void start(Stage stage) {
VBox box = new VBox();
Scene scene = new Scene(box, 200, 200);
stage.setScene(scene);
stage.setTitle("ListViewSample");
box.getChildren().addAll(list);
VBox.setVgrow(list, Priority.ALWAYS);
list.setItems(data);
list.setCellFactory(listView -> new ListCell<String>() {
public void updateItem(String friend, boolean empty) {
super.updateItem(friend, empty);
if (empty) {
setText(null);
setGraphic(null);
} else {
imageView.setImage(image);
setText(friend);
setGraphic(imageView);
}
}
});
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}`
回答by ItachiUchiha
You do not need to create a new HBox every time you want to set an image inside a ListView. You can directly use the setCellFactory()of the ListView to achieve the same result.
每次要在 ListView 中设置图像时，您都不需要创建新的 HBox。您可以直接使用setCellFactory()ListView 的 来实现相同的结果。
This example is just an extension of the answer Image in JavaFX ListView and contains a Minimal, Complete, and Verifiable examplewhich can be tried and tested. If you want to understand how this works, I suggest you to go through the linked question first.
此示例只是JavaFX ListView 中答案图像的扩展，包含一个可以尝试和测试的最小、完整和可验证示例。如果您想了解这是如何工作的，我建议您先阅读链接的问题。
Update- How to resize Images
更新- 如何调整图像大小
To resize images to fit the size you want, make use of fitWidth()and fitHeight()methods of the ImageView. There are other methods like setSmooth()and setPreserveRatio()which can come in handy as well.
要调整图像以适合您想要的大小，请使用ImageView 的 fitWidth()和fitHeight()方法。还有其他方法，如setSmooth()和setPreserveRatio()也可以派上用场。
MCVE
MCVE
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class ListViewWithImages extends Application {
private final Image IMAGE_RUBY = new Image("https://upload.wikimedia.org/wikipedia/commons/f/f1/Ruby_logo_64x64.png");
private final Image IMAGE_APPLE = new Image("http://findicons.com/files/icons/832/social_and_web/64/apple.png");
private final Image IMAGE_VISTA = new Image("http://antaki.ca/bloom/img/windows_64x64.png");
private final Image IMAGE_TWITTER = new Image("http://files.softicons.com/download/social-media-icons/fresh-social-media-icons-by-creative-nerds/png/64x64/twitter-bird.png");
private Image[] listOfImages = {IMAGE_RUBY, IMAGE_APPLE, IMAGE_VISTA, IMAGE_TWITTER};
@Override
public void start(Stage primaryStage) throws Exception {
ListView<String> listView = new ListView<String>();
ObservableList<String> items =FXCollections.observableArrayList (
"RUBY", "APPLE", "VISTA", "TWITTER");
listView.setItems(items);
listView.setCellFactory(param -> new ListCell<String>() {
private ImageView imageView = new ImageView();
@Override
public void updateItem(String name, boolean empty) {
super.updateItem(name, empty);
if (empty) {
setText(null);
setGraphic(null);
} else {
if(name.equals("RUBY"))
imageView.setImage(listOfImages[0]);
else if(name.equals("APPLE"))
imageView.setImage(listOfImages[1]);
else if(name.equals("VISTA"))
imageView.setImage(listOfImages[2]);
else if(name.equals("TWITTER"))
imageView.setImage(listOfImages[3]);
setText(name);
setGraphic(imageView);
}
}
});
VBox box = new VBox(listView);
box.setAlignment(Pos.CENTER);
Scene scene = new Scene(box, 200, 200);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
OUTPUT
输出
回答by Martin Pfeffer
In addition to my comment I will show here some code, that is working for me:
除了我的评论之外，我还会在这里展示一些对我有用的代码：
private void setListEntry(ListCell<Label> listCell, Label label) {
Image img = loadLableIcon(label);
GridPane row = new GridPane();
row.setHgap(15);
row.setVgap(15);
ColumnConstraints col1 = new ColumnConstraints();
col1.setPercentWidth(90);
ColumnConstraints col2 = new ColumnConstraints();
col2.setPercentWidth(10);
ImageView icon = new ImageView(img);
javafx.scene.control.Label name = new javafx.scene.control.Label(label.getName());
name.setMinWidth(120d);
javafx.scene.control.Label amount = new javafx.scene.control.Label("" + label.getSize());
HBox iconAndName = new HBox(10);
iconAndName.setAlignment(Pos.CENTER_LEFT);
iconAndName.getChildren().addAll(icon, name);
row.add(iconAndName, 0, 0);
row.add(amount, 1, 0);
row.getColumnConstraints().addAll(col1, col2);
listCell.setGraphic(row);
}
Please note: I'm not an expert in JavaFX, so I am not sure if it's best practise or not.
请注意：我不是 JavaFX 的专家，所以我不确定这是否是最佳实践。
