javafx2.0 在表格(TableView)中显示选择按钮(CheckBox)

 

 

要在JFX的表格中显示自定义的单元(TableCell), 必须实现一个继承于javafx.scene.control.TableCell的自定义单元.  JFX官方没有为TableView提供像列表/选项按钮/文本框这样的常用控件, 如果你需要这些控件, 可以在另外一个项目中下载这些控件. 参见:http://www.javafxdata.org .(以下代码的实现参考了www.javafxdata.org)

 

首先定义一个TableCell来显示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作为便利方法, 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);
			}
		};
	}

	
	
	
}

 

 

定义一个用于测试的实体类. 

 

public class Goods{//商品类
        private boolean available;//是否有效   用原子类型表示
        private BooleanProperty  hotSaleProperty;//是否热销 用可绑定属性表示

        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>("是否热销");
col.setCellValueFactory(new PropertyValueFactory<Goods,Boolean>("hotSale");
col.setCellFactory(CellFactory.tableCheckBoxColumn());

 

 

上面两个列使用不同的绑定方法. 第一列"是否有效"对应Goods中的boolean属性available. 该属性不支持JFX的动态绑定, 所以在定义列的时候建立一个Callback来动态更新属性.

第二个列"是否热销"对应Goods的boolean属性hotSaleProperty. 该属性支持JFX的动态绑定, 在定义列时无需做任何修改就可以实现实体与表格的绑定.

从上面的例子也可以看到, 在新版的JFX中, 如果实体类原生支持JFX的绑定类型在实现数据绑定会方便很多.

 

以上是JFX中自定义单选框的实现. 关于列表(ListView)和树(TreeView)的实现也类似.

 

参考阅读:

JFX的数据绑定:http://docs.oracle.com/javafx/2.0/binding/jfxpub-binding.htm

用于数据绑定的JFX框架: http://www.javafxdata.org