/* Make sure the accordion can never be completely collapsed */
accordeon.expandedPaneProperty().addListener((ObservableValue<? extends TitledPane> observable, TitledPane oldPane, TitledPane newPane) -> {
Boolean expand = true; // This value will change to false if there's (at least) one pane that is in "expanded" state, so we don't have to expand anything manually
for(TitledPane pane: accordeon.getPanes()) {
if(pane.isExpanded()) {
expand = false;
}
}
/* Here we already know whether we need to expand the old pane again */
if((expand == true) && (oldPane != null)) {
Platform.runLater(() -> {
accordeon.setExpandedPane(oldPane);
});
}
});
4
将侦听器添加到当前展开的折叠式窗格，并通过修改其可折叠属性来防止用户折叠它 .
这是一个示例应用程序：
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
public class AccordionSample extends Application {
public static void main(String[] args) { launch(args); }
@Override public void start(Stage primaryStage) {
// create some titled panes to go in an accordion.
TitledPane adminPane = new TitledPane("Animals",
VBoxBuilder.create().style("-fx-padding: 10").spacing(10).children(
ButtonBuilder.create().text("Zebra").maxWidth(Double.MAX_VALUE).build(),
ButtonBuilder.create().text("Shrew").maxWidth(Double.MAX_VALUE).build()
).build()
);
TitledPane viewPane = new TitledPane("Vegetables",
VBoxBuilder.create().style("-fx-padding: 10").spacing(10).children(
ButtonBuilder.create().text("Eggplant").maxWidth(Double.MAX_VALUE).build(),
ButtonBuilder.create().text("Carrot").maxWidth(Double.MAX_VALUE).build()
).build()
);
// create an accordion, ensuring the currently expanded pane can not be clicked on to collapse.
Accordion accordion = new Accordion();
accordion.getPanes().addAll(adminPane, viewPane);
accordion.expandedPaneProperty().addListener(new ChangeListener<TitledPane>() {
@Override public void changed(ObservableValue<? extends TitledPane> property, final TitledPane oldPane, final TitledPane newPane) {
if (oldPane != null) oldPane.setCollapsible(true);
if (newPane != null) Platform.runLater(new Runnable() { @Override public void run() {
newPane.setCollapsible(false);
}});
}
});
for (TitledPane pane: accordion.getPanes()) pane.setAnimated(false);
accordion.setExpandedPane(accordion.getPanes().get(0));
// layout the scene.
StackPane layout = new StackPane();
layout.setStyle("-fx-padding: 10; -fx-background-color: cornsilk;");
layout.getChildren().add(accordion);
primaryStage.setScene(new Scene(layout));
primaryStage.show();
}
}
2 回答
这是确保手风琴永远不会彻底崩溃的另一种解决方案 . 与@jewelsea的原始答案的区别很小 - 我不喜欢这样一个事实，即默认的向下箭头正从开放的手风琴TitledPane脸上消失，因为它的“可折叠”属性被设置为假 . 我玩了一下，为我的界面带来了更“自然”的感觉 .
将侦听器添加到当前展开的折叠式窗格，并通过修改其可折叠属性来防止用户折叠它 .
这是一个示例应用程序：