JavaFX 从 ToggleGroup 取消切换单选按钮
JavaFX untoggle a radio button from a ToggleGroup
我在 ToggleGroup 中有 2 个 RadioButton。我希望能够在单击时取消选择 单选按钮(如果它已被选中)。
SampleController.java(控制器class)
public class SampleController {
@FXML
private RadioButton button1;
@FXML
private RadioButton button2;
public void initializeButtons() {
ToggleGroup toggles = new ToggleGroup();
button1.setToggleGroup(toggles);
button2.setToggleGroup(toggles);
toggles.selectedToggleProperty().addListener(new ChangeListener<Toggle>(){
public void changed(ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) {
System.out.println("curently : " + toggles.getSelectedToggle().isSelected());
}
});
}
}
如果我保留上面显示的代码,如果我切换一个按钮,那么另一个按钮将取消切换,反之亦然,但我无法取消两个按钮。我希望能够取消选择一个RadioButton
,也就是说,移除它的焦点并return它回到原来的状态。
我正在寻找等同于
的东西
buttonGroup.clearSelection()
来自 class ButtonGroup
in Swing.
在 Whosebug 上看类似的问题,看来我必须这样做
(...)
public void changed(ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) {
if(toggles.getSelectedToggle() != null) {
if(toggles.getSelectedToggle().isSelected()){
toggles.getSelectedToggle().setSelected(false);
} else {
toggles.getSelectedToggle().setSelected(true);
}
}
System.out.println("curently : " + toggles.getSelectedToggle().isSelected());
}
(...)
但是添加这段代码 return 每当我单击任何单选按钮时都会出现以下堆栈跟踪错误
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at SampleController.changed(SampleController.java:32)
at SampleController.changed(SampleController.java:1)
at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.base/javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)
at javafx.base/javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)
at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
at javafx.controls/javafx.scene.control.ToggleGroup.set(ToggleGroup.java:138)
at javafx.controls/javafx.scene.control.ToggleGroup.set(ToggleGroup.java:120)
at javafx.controls/javafx.scene.control.ToggleGroup.selectToggle(ToggleGroup.java:150)
at javafx.controls/javafx.scene.control.ToggleButton.invalidated(ToggleButton.java:169)
at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
at javafx.controls/javafx.scene.control.ToggleButton.setSelected(ToggleButton.java:150)
at javafx.controls/javafx.scene.control.ToggleButton.fire(ToggleButton.java:256)
at javafx.controls/javafx.scene.control.RadioButton.fire(RadioButton.java:113)
at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3851)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access00(Scene.java:3579)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop(GtkApplication.java:277)
at java.base/java.lang.Thread.run(Thread.java:829)
清除切换组中选择的内置方法是
toggles.selectToggle(null);
弄清楚何时调用它来实现你想要的有点棘手。真的,您可能应该使用 ToggleButton
s 并重新设置它们的样式,使其看起来像 RadioButton
s,或者使用 RadioButton
s 和自定义皮肤,将行为重新定义为您想要的.这两个都是相当多的工作(尤其是后者)。
尽管以下快速技巧似乎有效:
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.ButtonBase;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class App extends Application {
private final ToggleGroup toggles = new ToggleGroup();
@Override
public void start(Stage stage) {
VBox root = new VBox(5);
root.setPadding(new Insets(20));
root.getChildren().add(createToggle("Option 1"));
root.getChildren().add(createToggle("Option 2"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
private ButtonBase createToggle(String name) {
RadioButton toggle = new RadioButton(name);
toggle.addEventFilter(MouseEvent.MOUSE_PRESSED, e -> {
if (toggle.isSelected()) {
toggles.selectToggle(null);
e.consume();
}
});
toggle.setToggleGroup(toggles);
return toggle;
}
public static void main(String[] args) {
launch();
}
}
我在 ToggleGroup 中有 2 个 RadioButton。我希望能够在单击时取消选择 单选按钮(如果它已被选中)。
SampleController.java(控制器class)
public class SampleController {
@FXML
private RadioButton button1;
@FXML
private RadioButton button2;
public void initializeButtons() {
ToggleGroup toggles = new ToggleGroup();
button1.setToggleGroup(toggles);
button2.setToggleGroup(toggles);
toggles.selectedToggleProperty().addListener(new ChangeListener<Toggle>(){
public void changed(ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) {
System.out.println("curently : " + toggles.getSelectedToggle().isSelected());
}
});
}
}
如果我保留上面显示的代码,如果我切换一个按钮,那么另一个按钮将取消切换,反之亦然,但我无法取消两个按钮。我希望能够取消选择一个RadioButton
,也就是说,移除它的焦点并return它回到原来的状态。
我正在寻找等同于
的东西buttonGroup.clearSelection()
来自 class ButtonGroup
in Swing.
在 Whosebug 上看类似的问题,看来我必须这样做
(...)
public void changed(ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) {
if(toggles.getSelectedToggle() != null) {
if(toggles.getSelectedToggle().isSelected()){
toggles.getSelectedToggle().setSelected(false);
} else {
toggles.getSelectedToggle().setSelected(true);
}
}
System.out.println("curently : " + toggles.getSelectedToggle().isSelected());
}
(...)
但是添加这段代码 return 每当我单击任何单选按钮时都会出现以下堆栈跟踪错误
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at SampleController.changed(SampleController.java:32)
at SampleController.changed(SampleController.java:1)
at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.base/javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)
at javafx.base/javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)
at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
at javafx.controls/javafx.scene.control.ToggleGroup.set(ToggleGroup.java:138)
at javafx.controls/javafx.scene.control.ToggleGroup.set(ToggleGroup.java:120)
at javafx.controls/javafx.scene.control.ToggleGroup.selectToggle(ToggleGroup.java:150)
at javafx.controls/javafx.scene.control.ToggleButton.invalidated(ToggleButton.java:169)
at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
at javafx.controls/javafx.scene.control.ToggleButton.setSelected(ToggleButton.java:150)
at javafx.controls/javafx.scene.control.ToggleButton.fire(ToggleButton.java:256)
at javafx.controls/javafx.scene.control.RadioButton.fire(RadioButton.java:113)
at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3851)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access00(Scene.java:3579)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop(GtkApplication.java:277)
at java.base/java.lang.Thread.run(Thread.java:829)
清除切换组中选择的内置方法是
toggles.selectToggle(null);
弄清楚何时调用它来实现你想要的有点棘手。真的,您可能应该使用 ToggleButton
s 并重新设置它们的样式,使其看起来像 RadioButton
s,或者使用 RadioButton
s 和自定义皮肤,将行为重新定义为您想要的.这两个都是相当多的工作(尤其是后者)。
尽管以下快速技巧似乎有效:
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.ButtonBase;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class App extends Application {
private final ToggleGroup toggles = new ToggleGroup();
@Override
public void start(Stage stage) {
VBox root = new VBox(5);
root.setPadding(new Insets(20));
root.getChildren().add(createToggle("Option 1"));
root.getChildren().add(createToggle("Option 2"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
private ButtonBase createToggle(String name) {
RadioButton toggle = new RadioButton(name);
toggle.addEventFilter(MouseEvent.MOUSE_PRESSED, e -> {
if (toggle.isSelected()) {
toggles.selectToggle(null);
e.consume();
}
});
toggle.setToggleGroup(toggles);
return toggle;
}
public static void main(String[] args) {
launch();
}
}