JavaFX从不同的类更改窗格颜色 [英] JavaFX change Pane color from a different class
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问题描述
我有一个问题。
我想从另一个控制器类更改窗格的颜色。
我正在使用此代码：
I have a question. I want to change the color of a pane from another controller class. I am using this code:
FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/Menu.fxml"));
try {
Parent loaded = (Parent) loader.load();
} catch (IOException e) {
e.printStackTrace();
}
MenuController controller = (MenuController) loader.getController();
Platform.runLater(new Runnable() {
@Override
public void run() {
Pane pane = controller.getRedPane();
pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
}
});
加载的控制器和窗格不为空。
但是窗格的颜色没有变化，有人可以帮我解决这个问题吗？
非常感谢。
The loaded, controller and pane aren't null. But the pane's color doesn't change, can someone help me with this problem? Thank you very much.
public class MenuController implements Initializable
{
@FXML
private GridPane MenuRoot;
@FXML
private Pane redPane;
@Override
public void initialize(URL location, ResourceBundle resources)
{
}
@FXML
private void changeGridSize(ActionEvent event){
new ChangeSizes();
}
public GridPane getMenuRoot(){
return this.MenuRoot;
}
public Pane getRedPane(){
return this.redPane;
}
}
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<GridPane fx:id="MenuRoot" gridLinesVisible="true" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="nl.voxworks.homeserver.client.MenuController">
<columnConstraints>
<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
<RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
</rowConstraints>
<children>
<Pane fx:id="redPane" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: red;" GridPane.rowIndex="1" />
<Pane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: black;" GridPane.columnIndex="1" GridPane.rowIndex="1" />
</children>
</GridPane>
（包含所有文件的不同项目）
package javafxapplication16;
(different project all files included) package javafxapplication16;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Platform;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Insets;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
public class ChangeSize {
public ChangeSize(){
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
try {
loader.load();
} catch (IOException ex) {
Logger.getLogger(ChangeSize.class.getName()).log(Level.SEVERE, null, ex);
}
FXMLDocumentController controller = (FXMLDocumentController) loader.getController();
Platform.runLater(new Runnable() {
@Override
public void run() {
Pane pane = controller.getPane();
pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
}
});
}
}
FXMLDocumentController。
FXMLDocumentController.
package javafxapplication16;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.layout.Pane;
public class FXMLDocumentController implements Initializable {
@FXML
private Pane redPane;
@FXML
private void changeGridSize(ActionEvent event){
new ChangeSize();
}
@Override
public void initialize(URL url, ResourceBundle rb) {
}
public Pane getPane(){
return this.redPane;
}
}
JavaFXApplication16
JavaFXApplication16
package javafxapplication16;
import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class JavaFXApplication16 extends Application {
@Override
public void start(Stage stage) throws Exception {
// Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
// FXMLLoader loader
Parent loaded=null;
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
try {
loaded = (Parent) loader.load();
} catch (IOException e) {
e.printStackTrace();
}
Scene scene = new Scene(loaded);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
FXML
FXML
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<GridPane fx:id="MenuRoot" gridLinesVisible="true" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication16.FXMLDocumentController">
<columnConstraints>
<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
<RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
</rowConstraints>
<children>
<Pane fx:id="redPane" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: red;" GridPane.rowIndex="1" />
<Pane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: black;" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<Button mnemonicParsing="false" onAction="#changeGridSize" text="Button" />
</children>
</GridPane>
推荐答案
这是我的代码：我希望能帮到你
This is my code: I hope helped you
FXMLDocumentController.class
FXMLDocumentController.class
public class FXMLDocumentController implements Initializable {
@FXML
private Pane redPane;
@FXML
private void changeGridSize(ActionEvent event){
// new ChangeSizes();
}
@Override
public void initialize(URL url, ResourceBundle rb) {
}
public Pane getPane(){
return this.redPane;
}
}
JavaFXMLApplication3.class
JavaFXMLApplication3.class
public class JavaFXMLApplication3 extends Application {
@Override
public void start(Stage stage) throws Exception {
// Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
// FXMLLoader loader
Parent loaded=null;
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
try {
loaded = (Parent) loader.load();
} catch (IOException e) {
e.printStackTrace();
}
Scene scene = new Scene(loaded);
stage.setScene(scene);
stage.show();
FXMLDocumentController controller = (FXMLDocumentController) loader.getController();
Platform.runLater(new Runnable() {
@Override
public void run() {
Pane pane = controller.getPane();
pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
}
});
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
FXMLDocument.fxml
FXMLDocument.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<GridPane fx:id="MenuRoot" gridLinesVisible="true" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxmlapplication3.FXMLDocumentController">
<columnConstraints>
<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
<RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
</rowConstraints>
<children>
<Pane fx:id="redPane" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: red;" GridPane.rowIndex="1" />
<Pane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: black;" GridPane.columnIndex="1" GridPane.rowIndex="1" />
</children>
</GridPane>
我测试你的代码，问题是你创建了另一个没有显示的Pane redPane：
当你调用FXMLLoader时你创建了一个未在舞台上显示的新加载器。
I test your code and the problem is that you create another Pane redPane that isn't show: when you call FXMLLoader you create a new loader that isn't show in stage.
我建议你一个可能的解决方案：创建一个静态舞台......例子代码：
I suggested you a possible solution : create a static Stage ... example code:
public class JavaFXMLApplication3 extends Application {
static Stage staticstage;
// Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
// FXMLLoader loader
@Override
public void start(Stage stage) throws Exception {
// Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
// FXMLLoader loader
staticstage=stage;
Parent loaded=null;
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
try {
loaded = (Parent) loader.load();
} catch (IOException e) {
e.printStackTrace();
}
Scene scene = new Scene(loaded);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
并更改类ChangeSize
and change class ChangeSize
public class ChangeSize {
public ChangeSize() {
Parent loaded=null;
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
try {
loaded = (Parent) loader.load();
} catch (IOException e) {
e.printStackTrace();
}
Scene scene = new Scene(loaded);
JavaFXMLApplication3.staticstage.setScene(scene);
JavaFXMLApplication3.staticstage.show();
FXMLDocumentController controller = (FXMLDocumentController) loader.getController();
Platform.runLater(new Runnable() {
@Override
public void run() {
Pane pane = controller.getPane();
pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
}
});
}
}
另一个解决方案是将FXMLDocumentController传递给类ChangeSize ...示例代码：
another solution is to pass FXMLDocumentController to class ChangeSize ... example code :
public class ChangeSize {
public ChangeSize(FXMLDocumentController controller) {
Platform.runLater(new Runnable() {
@Override
public void run() {
Pane pane = controller.getPane();
pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
}
});
}
和FXMLDocumentController类更改changeGridSize
and in FXMLDocumentController class change the changeGridSize
@FXML
private void changeGridSize(ActionEvent event){
new ChangeSize(this);
}
这篇关于JavaFX从不同的类更改窗格颜色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！
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