我試圖在一個(gè)ListView可以選擇多個(gè)項(xiàng)目的地方和一個(gè)ObjectProperty. 當(dāng)一個(gè)項(xiàng)目被選中時(shí)，我想相應(yīng)地過濾一TableView列：使用兩個(gè)較低的過濾器（組件、詳細(xì)信息），我進(jìn)行如下綁定：ObjectProperty<Predicate<Log>> detailsSearchFilter = new SimpleObjectProperty<>();TextField detailsSearchField = new TextField();detailsSearchField.setPromptText("e.g. finished initializing");detailsSearchFilter.bind(Bindings.createObjectBinding(() -> log -> log.getDetails().toLowerCase().contains(detailsSearchField.getText().toLowerCase()), detailsSearchField.textProperty() ));然后稍后添加邏輯運(yùn)算符方法and()以便能夠組合所有過濾器：logFilteredList.predicateProperty().bind(Bindings.createObjectBinding(() -> detailsSearchFilter.get().and(componentSearchFilter.get()).and(sourceFilter.get()), detailsSearchFilter, componentSearchFilter, sourceFilter ));對(duì)于其他兩個(gè)ListView過濾器，我正在考慮做這樣的事情：private final static String[] sources = new String[]{"ECS","IISNode","PrismWebServer"};ListView<String> sourceList = new ListView<>();ObservableList sourceItems = FXCollections.observableArrayList(sources);sourceList.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);sourceList.getItems().addAll(sources);ListView<String> selected = new ListView<>();sourceList.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> { selected.setItems(sourceList.getSelectionModel().getSelectedItems()); System.out.println(Arrays.toString(selected.getItems().toArray())); });因此該selected列表現(xiàn)在包括當(dāng)前選擇的所有值。如何將sourceFilter與selected列表的所有值綁定？我正在考慮遍歷列表中的每個(gè)值并以這種方式綁定： sourceFilter.bind(Bindings.createObjectBinding(() -> log -> log.getSource().toLowerCase().contains(selected.getItems().get(i).toLowerCase()), sourceList.selectionModelProperty() ));但這似乎不是很優(yōu)雅，我不確定我是否selectionModelProperty以正確的方式使用。
1 回答
郎朗坤
TA貢獻(xiàn)1921條經(jīng)驗(yàn) 獲得超9個(gè)贊
的selectionModelProperty時(shí)候才會(huì)觸發(fā)改變selectionModel被替換這通常不會(huì)發(fā)生。依賴關(guān)系應(yīng)該是sourceList.getSelectionModel().getSelectedItems().
此外，按照我的理解，您應(yīng)該查詢Log'ssource是否在所選項(xiàng)目中，而不是該source字符串是否在所選項(xiàng)目列表中的某個(gè)位置包含字符串的某些部分。
另請(qǐng)注意，ListView應(yīng)避免僅使用 a來存儲(chǔ)數(shù)據(jù)，對(duì)于大型列表，contains對(duì) aSet而不是 a進(jìn)行檢查效率更高List。
你可以使用這樣的代碼：
ObjectBinding<Predicate<Log>> binding = new ObjectBinding<Predicate<String>>() {
private final Set<String> strings = new HashSet<>();
{
sourceList.getSelectionModel().getSelectedItems().addListener(new ListChangeListener<String>() {
@Override
public void onChanged(ListChangeListener.Change<? extends String> c) {
boolean changed = false;
// modify set on selection change
while (c.next()) {
if (c.wasRemoved()) {
changed = true;
c.getRemoved().stream().map(String::toLowerCase).forEach(strings::remove);
}
if (c.wasAdded()) {
changed = true;
c.getAddedSubList().stream().map(String::toLowerCase).forEach(strings::add);
}
}
if (changed) {
invalidate();
}
}
});
}
@Override
protected Predicate<Log> computeValue() {
return log -> strings.contains(log.getSource().toLowerCase());
}
};
sourceFilter.bind(binding);
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