JavaFX 2 ComboBox setValue()不设置CB文本 [英] JavaFX 2 ComboBox setValue() does not set CB text
问题描述
我的问题是,所选的ComboBox项目文本在用setValue()选择后在屏幕上不可见。
以下是一些细节:
向我的CB添加项目:
combo.getItems (一个);
combo.getItems()。add(b);
combo.getItems()。add(c);
combo.getItems()。add(d);
之后,当按钮A被按下时:
combo.setValue(null);
按下按钮B时:
combo.setValue(a);
现在,如果我先按下Button B,会显示a
之后,如果我按下按钮A,没有文本显示在ComboBox上,那就OK了。
然后我按B,并且值没有在屏幕上更改。但是,如果我点击CB,a的行被突出显示,combo.getValue()返回a。
任何建议如何处理?
我有同样的问题。它看起来像一个错误。这是一个包含 Locale
的 ComboBox
的完整工作示例:
package org.example;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.util.StringConverter;
public final class ComboBoxTest extends应用程序{
@Override
public void start(final Stage stage)throws Exception {
//初始化UI
阶段。 setTitle(ComboBox Test);
final HBox root = new HBox(5.0f);
final Combobox< Locale> cbLocales = new ComboBox<>();
cbLocales.setConverter(new StringConverter< Locale>(){
@Override
public String toString(final Locale locale){
return locale.getDisplayName();
}
@Override
public Locale fromString(String string){
throw new UnsupportedOperationException();
}
});
cbLocales.setPrefWidth(250);
HBox.setMargin(cbLocales,new Insets(10));
root.getChildren()。add(cbLocales);
final Button btnFill = new Button(Fill);
HBox.setMargin(btnFill,new Insets(10));
root.getChildren()。add(btnFill);
final scene scene = new Scene(root);
stage.setScene(scene);
btnFill.setOnMouseClicked(new EventHandler< MouseEvent>(){
@Override
public void handle(final MouseEvent event){
//填写内容
final list< Locale> locales = Arrays.asList(Locale.ENGLISH,
Locale.GERMAN,Locale.FRENCH);
final Locale defaultLocale = locales.get(1);
/ / cbLocales.getItems.setAll(locales)不工作
cbLocales.getItems()。clear();
cbLocales.getItems()。addAll(locales);
//设置默认locale
cbLocales.setValue(defaultLocale);
cbLocales.setPromptText(cbLocales.getConverter()。toString(
cbLocales.getValue()));
}
} );
stage.show();
}
public static void main(String [] args){
launch(args);
}
}
$ b ComboBox
第一次填充,所有工作正常:
ComboBox
包含所有3 Locale
s和第二区域设置
已设置。
ComboxBox.setValue
<不工作:
ComboBox
包含所有3 Locale
s,但第二个 Locale 是不设置。未选择任何项目,不显示任何提示。
我修复了
的提示问题
//设置默认语言环境
cbLocales.setValue(defaultLocale);
cbLocales.setPromptText(cbLocales.getConverter()。toString(
cbLocales.getValue()));
但不选择列表中的项目:
>
一个解决方法是:
cbLocales.getSelectionModel()。select(defaultLocale);
cbLocales.setPromptText(cbLocales.getConverter()。toString(cbLocales.getValue()));
选择项目并设置提示。但我不知道,如果有运动员的问题(工具提示或类似)
My problem is that the selected ComboBox item text is not visible on the screen after selecting it with setValue().
Here are some details:
Adding items to my CB:
combo.getItems().add("a");
combo.getItems().add("b");
combo.getItems().add("c");
combo.getItems().add("d");
Afterwards, when Button A is pushed:
combo.setValue(null);
When Button B is pushed:
combo.setValue("a");
Now, if I push Button B first, "a" is shown, thats OK.
After that if I push Button A, no text is shown on the ComboBox, thats OK.
Then I push B, and the value did not change on the screen. However, if I click on the CB, the row for "a" is highlighted, and combo.getValue() returns "a".
Any suggestions how to handle this?
解决方案 I have the same problem. It looks like a bug. Here is a full working example with a ComboBox
that contains Locale
s:
package org.example;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.util.StringConverter;
public final class ComboBoxTest extends Application {
@Override
public void start(final Stage stage) throws Exception {
// Initialize UI
stage.setTitle("ComboBox Test");
final HBox root = new HBox(5.0f);
final ComboBox<Locale> cbLocales = new ComboBox<>();
cbLocales.setConverter(new StringConverter<Locale>() {
@Override
public String toString(final Locale locale) {
return locale.getDisplayName();
}
@Override
public Locale fromString(String string) {
throw new UnsupportedOperationException();
}
});
cbLocales.setPrefWidth(250);
HBox.setMargin(cbLocales, new Insets(10));
root.getChildren().add(cbLocales);
final Button btnFill = new Button("Fill");
HBox.setMargin(btnFill, new Insets(10));
root.getChildren().add(btnFill);
final Scene scene = new Scene(root);
stage.setScene(scene);
btnFill.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(final MouseEvent event) {
// Fill with content
final List<Locale> locales = Arrays.asList(Locale.ENGLISH,
Locale.GERMAN, Locale.FRENCH);
final Locale defaultLocale = locales.get(1);
// cbLocales.getItems.setAll(locales) doesn't work
cbLocales.getItems().clear();
cbLocales.getItems().addAll(locales);
// Set default locale
cbLocales.setValue(defaultLocale);
cbLocales.setPromptText(cbLocales.getConverter().toString(
cbLocales.getValue()));
}
});
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
When the ComboBox
filled for the first time, all works fine: The ComboBox
contains all 3 Locale
s and the second Locale
is set.
After filling a second time, ComboxBox.setValue
doesn't work: The ComboBox
contains all 3 Locale
s but the second Locale
is not set. No item is selected an no prompt is shown.
I fixed the prompt problem with
// Set default locale
cbLocales.setValue(defaultLocale);
cbLocales.setPromptText(cbLocales.getConverter().toString(
cbLocales.getValue()));
but it doesn't select the item in the list:
A work around is that:
cbLocales.getSelectionModel().select(defaultLocale);
cbLocales.setPromptText(cbLocales.getConverter().toString(cbLocales.getValue()));
To select the item and set the prompt. But I don't know, if there are athor problems with that (tool tips or similar)
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