我有一个JavaFX应用程序。主窗口包含一个TabPane(P1)。 P1包含4个不同的Tab控件(T11,T12,T13,T14)。 T11包含一个TabPane(P2),它包含两个Tab控件(T21,T22)。
我正在寻找一种简单的方法来检测然后任何Tab控件获取或失去可见性。使用SelectionModel事件是不够的。
// LG
答案 0 :(得分:0)
您可以观察每个标签selectedProperty
。对于T21和T22,我想你真的想知道T21和T11是否都被选中以知道T21是否可见;为此您只需观察t11.selectedProperty().and(t21.selectedProperty())
:即您可以执行类似
t11.selectedProperty().and(t21.selectedProperty()).addListener(...);
并提供ChangeListener<Boolean>
。当且仅当选择了t11和t12时,这将是true
,并且如果收件人从false
更改为true
或反之亦然,则会通知收听者。
这是使用FXML的完整示例。
import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class TabSelectionDemo extends Application {
@Override
public void start(Stage primaryStage) throws IOException {
primaryStage.setScene(new Scene(FXMLLoader.load(getClass().getResource("TabSelectionDemo.fxml")), 600, 400));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
TabSelectionDemo.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.TabPane?>
<?import javafx.scene.control.Tab?>
<?import javafx.scene.control.Label?>
<TabPane xmlns:fx="http://javafx.com/fxml/1" fx:controller="TabSelectionDemoController" fx:id="p1">
<Tab fx:id="t11" text="T11">
<TabPane fx:id="p2">
<Tab fx:id="t21" text="T21">
<Label text="This is T21"/>
</Tab>
<Tab fx:id="t22" text="T22">
<Label text="This is T22"/>
</Tab>
</TabPane>
</Tab>
<Tab fx:id="t12" text="T12">
<Label text="This is T12"/>
</Tab>
<Tab fx:id="t13" text="T13">
<Label text="This is T13"/>
</Tab>
<Tab fx:id="t14" text="T14">
<Label text="This is T14"/>
</Tab>
</TabPane>
TabSelectionDemoController.java:
import javafx.beans.binding.BooleanBinding;
import javafx.beans.value.ChangeListener;
import javafx.fxml.FXML;
import javafx.scene.control.Tab;
public class TabSelectionDemoController {
@FXML
private Tab t11 ;
@FXML
private Tab t12 ;
@FXML
private Tab t13 ;
@FXML
private Tab t14 ;
@FXML
private Tab t21 ;
@FXML
private Tab t22 ;
private BooleanBinding t21Selected ;
private BooleanBinding t22Selected ;
public void initialize() {
t11.selectedProperty().addListener(createListener("t11"));
t12.selectedProperty().addListener(createListener("t12"));
t13.selectedProperty().addListener(createListener("t13"));
t14.selectedProperty().addListener(createListener("t14"));
t21Selected = t21.selectedProperty().and(t11.selectedProperty()) ;
t22Selected = t22.selectedProperty().and(t11.selectedProperty()) ;
t21Selected.addListener(createListener("t21"));
t22Selected.addListener(createListener("t22"));
}
private ChangeListener<Boolean> createListener(String tabName) {
return (obs, wasSelected, isNowSelected) -> {
if (isNowSelected) {
System.out.println(tabName + " gained visible selection");
} else {
System.out.println(tabName + " lost visible selection");
}
};
}
}