如何在JavaFX表视图中添加按钮
发布时间：2020-12-15 07:38:32 所属栏目：Java 来源：网络整理
导读：我在谷歌和Stackoverflow上搜索了这个,我只是没有得到给定的例子.有人可以向我解释一下. 我想在表视图的最后一列添加一个按钮,当它被单击时,它应该触发一个监听器并传递按钮行的对象.我只是没有从gist.github.com获得以下示例： 这是我目前的完整代码： publ
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我在谷歌和Stackoverflow上搜索了这个,我只是没有得到给定的例子.有人可以向我解释一下.
我想在表视图的最后一列添加一个按钮,当它被单击时,它应该触发一个监听器并传递按钮行的对象.我只是没有从gist.github.com获得以下示例： 这是我目前的完整代码： public class SchermdeelWerkplaats extends BorderPane{
//ATD moeder klasse met alle collecties etc.
private ATD $;
TableView tabel = new TableView();
Button nieuwTaak = new Button("Nieuwe taak inboeken");
final ObservableList<Task> data = FXCollections.observableArrayList();
public SchermdeelWerkplaats(ATD a) {
$= a;
data.addAll($.agenda);
tabel.setEditable(false);
tabel.setPlaceholder(new Label("Geen taken"));
TableColumn c1 = new TableColumn("datum");
c1.setMinWidth(200);
TableColumn c2 = new TableColumn("type");
c2.setMinWidth(100);
TableColumn c3 = new TableColumn("uren");
c3.setMinWidth(100);
TableColumn c4 = new TableColumn("klaar");
c4.setMinWidth(200);
TableColumn c5 = new TableColumn("Werknemer");
c5.setMinWidth(100);
TableColumn c6= new TableColumn("Auto");
c6.setMinWidth(400);
TableColumn c7= new TableColumn("Actie");
c7.setMinWidth(400);
TableColumn col_action = new TableColumn<>("Action");
col_action.setCellValueFactory(
new Callback<TableColumn.CellDataFeatures<Task,Boolean>,ObservableValue<Boolean>>() {
@Override
public ObservableValue<Boolean> call(TableColumn.CellDataFeatures<Task,Boolean> p) {
return new SimpleBooleanProperty(p.getValue() != null);
}
});
col_action.setCellFactory(
new Callback<TableColumn<Task,Task>,TableCell<Task,Task>>() {
@Override
public TableCell<Task,Task> call(TableColumn<Task,Task> p) {
return new ButtonCell();
}
}
);
c1.setCellValueFactory(
new PropertyValueFactory<Task,Date>("date")
);
c2.setCellValueFactory(
new PropertyValueFactory<Task,Task.TaskType>("type")
);
c3.setCellValueFactory(
new PropertyValueFactory<Task,Double>("hours")
);
c4.setCellValueFactory(
new PropertyValueFactory<Task,Boolean>("done")
);
c5.setCellValueFactory(
new PropertyValueFactory<Task,Employee>("employee")
);
c6.setCellValueFactory(
new PropertyValueFactory<Task,Car>("car")
);
tabel.getColumns().addAll(c1,c2,c3,c4,c5,c6,c7);
tabel.setItems(data);
setCenter(tabel);
setBottom(nieuwTaak);
}
//letterlijk van internet geplukt en datatype aangepast
private class ButtonCell extends TableCell<Task,Task> {
private Button cellButton;
ButtonCell(){
cellButton = new Button("jjhjhjh");
cellButton.setOnAction(new EventHandler<ActionEvent>(){
@Override
public void handle(ActionEvent t) {
// do something when button clicked
Task record = getItem();
// do something with record....
}
});
}
//Display button if the row is not empty
@Override
protected void updateItem(Task record,boolean empty) {
super.updateItem(record,empty);
if(!empty){
cellButton.setText("Something with "+record);
setGraphic(cellButton);
} else {
setGraphic(null);
}
}
}
}
现在,我必须创建一个ButtonCell扩展TableCell的部分是可以理解的.但是如何将其分配给列？ 我理解这个： c1.setCellValueFactory(
new PropertyValueFactory<Task,Date>("date")
);
但不是这个： TableColumn col_action = new TableColumn<>("Action");
col_action.setCellValueFactory(
new Callback<TableColumn.CellDataFeatures<Task,ObservableValue<Boolean>>() {
@Override
public ObservableValue<Boolean> call(TableColumn.CellDataFeatures<Task,Boolean> p) {
return new SimpleBooleanProperty(p.getValue() != null);
}
});
col_action.setCellFactory(
new Callback<TableColumn<Task,Task>>() {
@Override
public TableCell<Task,Task> p) {
return new ButtonCell();
}
}
);
解决方法
为了能够呈现列,TableColumn需要cellValueFactory.但是底层数据模型中不存在“action”列.在这种情况下,我只是给cellValueFactory一些虚拟值并继续：
public class JustDoIt extends Application {
private final TableView<Person> table = new TableView<>();
private final ObservableList<Person> data
= FXCollections.observableArrayList(
new Person("Jacob","Smith"),new Person("Isabella","Johnson"),new Person("Ethan","Williams"),new Person("Emma","Jones"),new Person("Michael","Brown")
);
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
stage.setWidth(450);
stage.setHeight(500);
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
TableColumn actionCol = new TableColumn("Action");
actionCol.setCellValueFactory(new PropertyValueFactory<>("DUMMY"));
Callback<TableColumn<Person,String>,TableCell<Person,String>> cellFactory
= //
new Callback<TableColumn<Person,String>>() {
@Override
public TableCell call(final TableColumn<Person,String> param) {
final TableCell<Person,String> cell = new TableCell<Person,String>() {
final Button btn = new Button("Just Do It");
@Override
public void updateItem(String item,boolean empty) {
super.updateItem(item,empty);
if (empty) {
setGraphic(null);
setText(null);
} else {
btn.setOnAction(event -> {
Person person = getTableView().getItems().get(getIndex());
System.out.println(person.getFirstName()
+ " " + person.getLastName());
});
setGraphic(btn);
setText(null);
}
}
};
return cell;
}
};
actionCol.setCellFactory(cellFactory);
table.setItems(data);
table.getColumns().addAll(firstNameCol,lastNameCol,actionCol);
Scene scene = new Scene(new Group());
((Group) scene.getRoot()).getChildren().addAll(table);
stage.setScene(scene);
stage.show();
}
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private Person(String fName,String lName) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String fName) {
lastName.set(fName);
}
}
}
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