Question

当检查JFXListView中的所有JFXCheckBox并且未选中所有JFXCheckBox时，如何触发事件？

这是我的代码：

@FXML
private JFXListView li_se;

private void Services(ActionEvent e) {
        li_se.getItems().clear();
        for (int i = 0; i < R.OffrirService().size(); i++) {
            JFXCheckBox s = new JFXCheckBox(R.OffrirService().get(i));
            s.selectedProperty().addListener((obs, wasOn, isNowOn) -> {
                if (wasOn == false) {
                         //if checked do something                       
                } else {
                         //if unchecked do something
                }
                //System.out.println(s.getText() + " changed on state from " + wasOn + " to " + isNowOn);
            });
            li_se.getItems().add(s);
    }
}

Answer 1

@FXML
private JFXListView li_se;

int d;

@FXML
private void Services(ActionEvent e) {
    try {
        li_se.getItems().clear();
        for (int i = 0; i < R.OffrirService().size(); i++) {
            JFXCheckBox s = new JFXCheckBox(R.OffrirService().get(i));
            s.selectedProperty().addListener((obs, wasOn, isNowOn) -> {
                if (wasOn == false) {
                    //if checked do something
                    d++;
                        if (d == R.OffrirService().size()) {
                            //if all checked do something
                        }
                } else {
                    //if unchecked do something
                    d--;
                        if (d == 0) {
                            //if all unchecked do something
                        }
                //System.out.println(s.getText() + " changed on state from " + wasOn + " to " + isNowOn);
            });
            li_se.getItems().add(s);
    }
}

Answer 2

您可以探索Bindings。

选择了2个复选框的示例：

BooleanProperty bp = new SimpleBooleanProperty(false);
CheckBox cb1 = new CheckBox();
CheckBox cb2 = new CheckBox();
bp.bind(Bindings.and(cb1.selectedProperty(), cb2.selectedProperty()));
bp.addListener(new ChangeListener<Boolean>() {
    @Override
    public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {

    }
});

对于多个CheckBox，一些奇怪的想法到了。我希望可以解释一下。像unix chmod 000这样的主要想法 - 无法访问，777 - 所有访问权限。例如，你有五个CBox。让我们为每个增加一些价值。 CB1值1
CB2值2
CB3值3
CB4值4
CB5值5

并使用someVariable存储所有选定CBox的总值。未选中时：someVariable == 0。全部选中时：someVariable ==（1 + 2 + 3 + 4 + 5）

  IntegerProperty checkedNumbers = new SimpleIntegerProperty(0);
    checkedNumbers.addListener(new javafx.beans.value.ChangeListener<Number>() {
        @Override
        public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
            if (newValue == 0) {
                //doSomething
            } else if (newValue == (1 + 2 + 3 + 4 + 5)) {
                //doSomethingElse
            }
        }
    });
    int cBoxNumbers = 5;

    //Implement same ChangeListener for every CBoxes based on different UserData.
    //When CB selected, add its value to checkedNumbers
    //When unselected - subtract
    ChangeListener changeListener;

    for (int i = 1; i <= cBoxNumbers; i++) {
        CheckBox cb1 = new CheckBox();
        cb1.setUserData(i);
        cb1.selectedProperty().addListener(changeListener);
    }

如何在选中所有ListView CheckBox时触发JavaFX事件？

2 个答案: