Question

在javafx-2 ListView中，我注意到getSelectedIndices中有一个奇怪的（但仍可解决方法）行为。
getSelectedIndices属性（SelectionModel）是一个可观察的列表，如果允许多个选择，它应该包含所选项目或所选项目。
但是，如果我添加一个项目，选择它然后将其删除，您可能会认为选择不包含任何项目，但实际上它确实包含一个项目并且精确为-1。以下是显示这一事实的最简单的代码。

public class T01 extends Application {

public static void main (String [] args) { launch(args);}

ListView<String> listView;

//just create the controls, that is a BorderPane with a ListView in its center
@Override
public void start(Stage primaryStage) throws Exception {

    BorderPane borderPane = new BorderPane();

    listView = new ListView();

    borderPane.setCenter(listView);

    primaryStage.setScene(new Scene(borderPane));

    primaryStage.show();

    doTest();

}

//doTest: add an item, select it, remove it and inspect the selection model again
public void doTest() {

    System.out.println("A) before adding items");
    printSelectedItem(listView);

    listView.getItems().add("first");

    listView.getSelectionModel().select(0);

    System.out.println("B) added an item and selected");
    printSelectedItem(listView);


    listView.getItems().remove(0);

    System.out.println("C) removed the item");
    printSelectedItem(listView);

}

public void printSelectedItem(ListView listView) {
    ObservableList<Integer> list = listView.getSelectionModel().getSelectedIndices();
    System.out.println("The selectedIndices property contains: " + list.size() + " element(s):");
    for(int i=0; i<list.size(); i++) { System.out.println(i + ")" + list.get(i)); }
}

}

这是我的输出：

run:
A) before adding items
The selectedIndices property contains: 0 element(s):
B) added an item and selected
The selectedIndices property contains: 1 element(s):
0)0
C) removed the item
The selectedIndices property contains: 1 element(s):
0)-1

案例“C”表示“意外”行为。也许在某处记录？

环境信息： javafx.runtime.version：2.2.3-b05 java.runtime.version：1.6.0_29-b11 os.name:Windows 7 os.version：6.1

javafx-2，ListView selectedIndices属性的selectionModel在删除项目时不一致

0 个答案: