java 如何在 HBox 左、中和右对齐子项
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How to align children in a HBox Left, Center and Right
提问by Program-Me-Rev
I have a HBoxwith children set up as follows:
我有一个带孩子的HBox，设置如下：
HBox h = new HBox();
h.setMinWidth(555);
Label leftLabel = new Label("Left");
Label centerLabel = new Label("Center");
HBox rightContent = new HBox();
Label r1 = new Label("2");
Label r2 = new Label("3");
rightContent.getChildren().addAll(r1, r2);
h.getChildren().addAll(leftLabel, centerLabel, rightContent);
This will create a HBox with all the children floated on the left. I would like leftLabelto be on the left, centerLabelat the center, and rightContentto the extreme right.
这将创建一个 HBox，所有子项都浮动在左侧。我希望leftLabel位于左侧，centerLabel位于中心，而rightContent位于最右侧。
How can I achieve this?
我怎样才能做到这一点？
Thank you all in advance.
谢谢大家。
回答by Maxim
You can use the following trick:
您可以使用以下技巧：
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.Region;
import javafx.stage.Stage;
public class Main23 extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
Label label1 = new Label("Left");
label1.setStyle("-fx-background-color: red; -fx-text-fill: white;");
Label label2 = new Label("Center");
label2.setStyle("-fx-background-color: green; -fx-text-fill: white;");
Label label3 = new Label("Right");
label3.setStyle("-fx-background-color: blue; -fx-text-fill: white;");
Region region1 = new Region();
HBox.setHgrow(region1, Priority.ALWAYS);
Region region2 = new Region();
HBox.setHgrow(region2, Priority.ALWAYS);
HBox hBox = new HBox(label1, region1, label2, region2, label3);
primaryStage.setScene(new Scene(hBox, 640, 240));
primaryStage.show();
}
}
As you can see I just add several Regioncontrols for fill space between labels and set Hgrowproperty to ALWAYS.
如您所见，我只是添加了几个Region控件来填充标签之间的空间并将Hgrow属性设置为ALWAYS.
This trick is appropriate in some cases because sometimes you can't use other layouts i.e. if you want to align buttons inside of ToolBar.
这个技巧在某些情况下是合适的，因为有时你不能使用其他布局，即如果你想在ToolBar.
