要在JFX的表格中顯示自定義的單元(TableCell), 必須實現一個繼承於javafx.scene.control.TableCell的自定義單元.  JFX官方沒有為TableView提供像列表/選項按鈕/文字框這樣的常用控制元件, 如果你需要這些控制元件, 可以在另外一個專案中下載這些控制元件. 參見:http://www.javafxdata.org .(以下程式碼的實現參考了www.javafxdata.org)

首先定義一個TableCell來顯示CheckBox.

/* CheckBoxTableCell.java 1.0 2010-2-2
 * 
 * Copyright (c) 2012 by Chen Zhiwu
 * All rights reserved.
 * 
 * The copyright of this software is own by the authors.
 * You may not use, copy or modify this software, except
 * in accordance with the license agreement you entered into 
 * with the copyright holders. For details see accompanying license
 * terms.
 */
public class CheckBoxTableCell<S, T> extends TableCell<S, T> {
	private final CheckBox checkBox;
	private final boolean showText;
	private final Callback<T, String> toString;
	private final Callback<Integer, ObservableValue<Boolean>> getSelectedProperty;
	private ObservableValue<Boolean> booleanProperty;


	public CheckBoxTableCell() {
		this(null, null);
	}

	public CheckBoxTableCell(
			Callback<Integer, ObservableValue<Boolean>> toString) {
		this(toString, null);
	}

	public CheckBoxTableCell(
			Callback<Integer, ObservableValue<Boolean>> getSelectedProperty,
			Callback<T, String> toString) {
		this.getSelectedProperty = getSelectedProperty;
		this.toString = toString;
		this.showText = toString != null;
		this.checkBox = new CheckBox();
		setAlignment(Pos.CENTER);
		setGraphic(checkBox);
		
		if (showText) {
			checkBox.setAlignment(Pos.CENTER_LEFT);
		}
	}
	
	public CheckBoxTableCell(
			Callback<T, ObservableValue<Boolean>> callback,
			Callback<Integer, ObservableValue<Boolean>> getSelectedProperty,
			Callback<T, String> toString) {
		this.getSelectedProperty = getSelectedProperty;
		this.toString = toString;
		this.showText = toString != null;
		this.checkBox = new CheckBox();
		setAlignment(Pos.CENTER);
		setGraphic(checkBox);
		
		if (showText) {
			checkBox.setAlignment(Pos.CENTER_LEFT);
		}
	}
	
	
	@Override
	protected void updateItem(T item, boolean empty) {
		super.updateItem(item, empty);
		if (empty) {
			setText(null);
			setGraphic(null);
			return;
		} 
		if (this.showText) {
			setText(this.toString.call(item));
		}
		setGraphic(this.checkBox);
		if (this.booleanProperty instanceof BooleanProperty)
			this.checkBox.selectedProperty().unbindBidirectional(
					(BooleanProperty) this.booleanProperty);
		ObservableValue localObservableValue = getSelectedProperty();
		if (localObservableValue instanceof BooleanProperty) {
			this.booleanProperty = localObservableValue;
			this.checkBox.selectedProperty().bindBidirectional(
					(BooleanProperty) this.booleanProperty);
		}
		this.checkBox.visibleProperty().bind(getTableView().editableProperty()
				.and(getTableColumn().editableProperty())
				.and(editableProperty()));
	};

	private ObservableValue getSelectedProperty() {
		return ((this.getSelectedProperty != null) ? (ObservableValue) this.getSelectedProperty
				.call(Integer.valueOf(getIndex())) : getTableColumn()
				.getCellObservableValue(getIndex()));
	}
}
 

CellFactory作為便利方法, 方便外部使用CheckBoxTableCell.

/* CellFactory.java 1.0 2010-2-2
 * 
 * Copyright (c) 2012 by Chen Zhiwu
 * All rights reserved.
 * 
 * The copyright of this software is own by the authors.
 * You may not use, copy or modify this software, except
 * in accordance with the license agreement you entered into 
 * with the copyright holders. For details see accompanying license
 * terms.
 */

public class CellFactory {
	
	//////         table check box

	
	public static <S> Callback<TableColumn<S, Boolean>, TableCell<S, Boolean>> tableCheckBoxColumn() {
		return tableCheckBoxColumn(null, null);
	}

	public static <S, T> Callback<TableColumn<S, T>, TableCell<S, T>> tableCheckBoxColumn(
			Callback<Integer, ObservableValue<Boolean>> paramCallback) {
		return tableCheckBoxColumn(paramCallback, null);
	}

	public static <S, T> Callback<TableColumn<S, T>, TableCell<S, T>> tableCheckBoxColumn(
			Callback<Integer, ObservableValue<Boolean>> paramCallback,
			boolean paramBoolean) {
		Callback<T, String> callback = new Callback<T, String>() {
			@Override
			public String call(T t) {
				return ((t == null) ? "" : t.toString());
			}
		};
		return tableCheckBoxColumn(paramCallback, callback);
	}

	public static <S, T> Callback<TableColumn<S, T>, TableCell<S, T>> tableCheckBoxColumn(
			final Callback<Integer, ObservableValue<Boolean>> getSelectedProperty,
			final Callback<T, String> toString) {
		return new Callback<TableColumn<S, T>, TableCell<S, T>>() {
			@Override
			public TableCell<S, T> call(TableColumn<S, T> paramTableColumn) {
				return new CheckBoxTableCell<S,T>(getSelectedProperty,toString);
			}
		};
	}

	
	
	
}
 

定義一個用於測試的實體類. 

public class Goods{//商品類
        private boolean available;//是否有效   用原子型別表示
        private BooleanProperty  hotSaleProperty;//是否熱銷 用可繫結屬性表示

        public boolean getAvailable(){
                return avaliable;
        }

        public void setAvailable(boolean newValue){
                this.available=newValue;
        }

        public boolean getHotSale(){
                return hotSaleProperty.get();
        }
        public boolean setHotSale(boolean newValue){
                hotSaleProperty.set(newValue);
        }
}
 

外部使用CheckBoxTableCell.

TableColumn<Goods, Boolean>  availableColumn=new TableColumn<Goods, Boolean>("是否有效");
col.setCellValueFactory(new PropertyValueFactory<Goods,Boolean>("available");
col.setCellFactory(CellFactory.tableCheckBoxColumn(new Callback<Integer, ObservableValue<Boolean>>() {
	@Override
	public ObservableValue<Boolean> call(Integer index) {
							final Goods g= table.getItems().get(index);
							ObservableValue<Boolean> retval = new SimpleBooleanProperty(g,"available",g.getAvailable());
							retval.addListener(new ChangeListener<Boolean>() {
								@Override
								public void changed(
										ObservableValue<? extends Boolean> observable,
										Boolean oldValue, Boolean newValue) {
									g.setAvailable(newValue);
								}
							});
							return retval;	
						}
	}));

TableColumn<Goods, Boolean>  hotSaleColumn=new TableColumn<Goods, Boolean>("是否熱銷");
col.setCellValueFactory(new PropertyValueFactory<Goods,Boolean>("hotSale");
col.setCellFactory(CellFactory.tableCheckBoxColumn());

上面兩個列使用不同的繫結方法. 第一列"是否有效"對應Goods中的boolean屬性available. 該屬性不支援JFX的動態繫結, 所以在定義列的時候建立一個Callback來動態更新屬性.

第二個列"是否熱銷"對應Goods的boolean屬性hotSaleProperty. 該屬性支援JFX的動態繫結, 在定義列時無需做任何修改就可以實現實體與表格的繫結.

從上面的例子也可以看到, 在新版的JFX中, 如果實體類原生支援JFX的繫結型別在實現資料繫結會方便很多.

以上是JFX中自定義單選框的實現. 關於列表(ListView)和樹(TreeView)的實現也類似.

參考閱讀: