如何設置和獲取JavaFX Table的單元格值（如swing JTable）

Question

我是JavaFX新手，並且想知道如何設置和獲取JavaFX Table之類的Swing JTable的單元格值。 即JavaFX表中Swing JTable的setValueAt()和getValueAt的替代方法。

//would like to get the index of column by Name    
int index_RunnableQueueItem = tableQueue.getColumns().indexOf("RunnableQueueItem");
//would like to get the selected row
int row = tableQueue.getSelectionModel().getSelectedIndex();
if (index_RunnableQueueItem != -1 && row != -1) {
// would like to get the value at index of row and column.

//Update that value and set back to cell. 

}     

Answer 1

TableView確實不支持此方法。

這是使用反射來做您想要的事的一種較脆弱的方法。 它完全取決於您在單元格值工廠中使用PropertyValueFactory，因此它可以查找屬性名稱。

class MyItem
{
    SimpleStringProperty nameProperty = new SimpleStringProperty("name");
    public MyItem(String name) {
        nameProperty.set(name);
    }
    public String getName() { return nameProperty.get(); }
    public void setName(String name) { nameProperty.set(name); }
    public SimpleStringProperty getNameProperty() { return nameProperty; }
}

...

TableView<MyItem> t = new TableView<MyItem>();
TableColumn col = new TableColumn("Name Header");
col.setCellValueFactory(new PropertyValueFactory<MyItem, String>("name"));
t.getColumns().addAll(t);

...

public void setValue(int row, int col, Object val)
{
    final MyItem selectedRow = t.getItems().get(row);
    final TableColumn<MyItem,?> selectedColumn = t.getColumns().get(col);
    // Lookup the propery name for this column
    final String propertyName =   ((PropertyValueFactory)selectedColumn.getCellValueFactory()).getProperty();
    try 
    {
        // Use reflection to get the property
        final Field f = MyItem.class.getField(propertyName);
        final Object o = f.get(selectedRow);

        // Modify the value based on the type of property
        if (o instanceof SimpleStringProperty)
        {
            ((SimpleStringProperty)o).setValue(val.toString());
        }
        else if (o instanceof SimpleIntegerProperty)
        {
            ...
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

Answer 2

從JavaFx TableView單元中檢索簡單值

您可以使用其他文章中列出的偵聽器，但是如果您希望從單元格中獲取簡單值，則可以使用更簡單的方法

Example:

// Get the row index where your value is stored
    int rowIndex = tableView.getSelectionModel().getSelectedIndex();

// Since you can't get the value directly from the table like the 
// getValueAt method in JTable, you need to retrieve the entire row in
// FXCollections ObservableList object
    ObservableList rowList = 
        (ObservableList) tableViewModelos.getItems().get(rowIndex);

// Now you have an ObservableList object where you can retrieve any value
// you have stored using the columnIndex you now your value is, starting
// indexes at 0;

// In my case, I want to retrieve the first value corresponding to the first column           //index, and I know it is an Integer Value so I'll cast the object.
int columnIndex = 0;
int value = Integer.parseInt(rowList.get(columnIndex).toString());

希望本示例對您有所幫助。