如何将变量从控制器代码传递到fxml视图？ [英] How to pass variable from controller code to fxml view?

问题描述

我有自定义组件，标签很少，textField很少。我需要实例化它3次，但每个版本必须有所有标签前缀为不同的字符串。

我的组件片段fxml：

 < Label text =包含类型：/> 
< Label text =inclusions size：GridPane.rowIndex =1/> 
< Label text =包含数：GridPane.rowIndex =2/> 
  

我想实现某种代码占位符，如：

 < Label text =$ variable inclusions type：/> 
< Label text =$ variable size：GridPane.rowIndex =1/> 
< Label text =$ variable number：GridPane.rowIndex =2/> 
  

我尽量避免逐个注入所有标签，因为我知道不可能全部注入像ex一样向控制器发出标签。 收集和LT;标签> allLabels;

问题：如何将String从控制器代码传递到fxml视图，避免重复和不必要的工作？

解决方案

您可以使用

inclusions.fxml

 <？xml version =1.0encoding =UTF -8\" >？; 
 
<？import javafx.scene.control.Label？> 
<？import javafx.scene.layout.VBox？> 
 
< VBox spacing =10xmlns：fx =http://javafx.com/fxml> 
< Label text =$ {name +'inclusions type'}/> 
< Label text =$ {name +'inclusions size'}/> 
< Label text =$ {name +'inclusions number'}/> 
< / VBox> 
  

NamespaceAware.java

  import javafx.application.Application; 
 import javafx.fxml.FXMLLoader; 
 import javafx.geometry.Insets; 
 import javafx.scene.Scene; 
 import javafx.scene.layout.Pane; 
 import javafx.stage.Stage; 
 
 public class NamespaceAware extends Application {
 @Override 
 public void start（final Stage stage）抛出异常{
 FXMLLoader loader = new FXMLLoader（）; 
 loader.getNamespace（）。put（name，Foobar）; 
 loader.setLocation（getClass（）。getResource（inclusions.fxml））; 
 Pane content = loader.load（）; 
 
 content.setPadding（new Insets（10））; 
 
 stage.setScene（new Scene（content））; 
 stage.show（）; 
} 
 
 public static void main（String [] args）{
 launch（args）; 
} 
} 
  

I have custom component with few labels and few textFields. I need to instantiate it 3 times, but each version must have all labels prefixed with different String.

Fragment of my component fxml:

<Label text="inclusions type:"/>
<Label text="inclusions size:" GridPane.rowIndex="1"/>
<Label text="inclusions number:" GridPane.rowIndex="2"/>

I would like to achieve some kind of code placeholder like:

<Label text="$variable inclusions type:"/>
<Label text="$variable size:" GridPane.rowIndex="1"/>
<Label text="$variable number:" GridPane.rowIndex="2"/>

I try to avoid injecting all labels one by one, as I know there is no possibility to inject all labels at once to controller like ex. Collection<Label> allLabels;

Question: How to pass String from controller code to fxml view, avoiding duplication and unnecessary work?

解决方案

You can use a binding expression in your FXML to grab variable values out of the FXML namespace.

In the following example, we successfully inject the name "Foobar".

inclusions.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.VBox?>

<VBox spacing="10" xmlns:fx="http://javafx.com/fxml">
  <Label text="${name + ' inclusions type'}"/>
  <Label text="${name + ' inclusions size'}"/>
  <Label text="${name + ' inclusions number'}"/>
</VBox>

NamespaceAware.java

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class NamespaceAware extends Application {
    @Override
    public void start(final Stage stage) throws Exception {
        FXMLLoader loader = new FXMLLoader();
        loader.getNamespace().put("name", "Foobar");
        loader.setLocation(getClass().getResource("inclusions.fxml"));
        Pane content = loader.load();

        content.setPadding(new Insets(10));

        stage.setScene(new Scene(content));
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

这篇关于如何将变量从控制器代码传递到fxml视图？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！