JavaFX:如何正确为所选TableCell的背景着色?

时间:2019-01-30 07:43:14

标签: java javafx javafx-8

我要在选择行时将行背景色更改为绿色。但是,尽管所选行已更改颜色,但另外错误的行也已更改颜色。 我不知道为什么吗?

这是Windows 10 Intellij中的JavaFX程序代码。

TestFXML.java:

public class TestFXML implements Initializable {
    @FXML
    TableView<ItemLog> table;
    @FXML
    TableColumn<ItemLog,String> column1,column2,column4;
    @FXML
    TableColumn<ItemLog,Number> column3;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        ObservableList<ItemLog> root=FXCollections.observableArrayList();
        root.addAll(
                new ItemLog("E0001","2.5㎟ XLPE", 1.2,"m"),
                new ItemLog("E0002","4㎟ XLPE",1.5,"m"),
                new ItemLog("E0003","6㎟ XLPE",2.0,"m"),
                new ItemLog("E0004","10㎟ XLPE",4.0,"m"),
                new ItemLog("E0005","16㎟ XLPE",6.2,"m"),
                new ItemLog("E0006","25㎟ XLPE",9.1,"m"),
                new ItemLog("E0007","35㎟ XLPE",14.5,"m"),
                new ItemLog("E0008","50㎟ XLPE",20.6,"m"),
                new ItemLog("E0009","70㎟ XLPE",31.2,"m"),
                new ItemLog("E00010","120㎟ XLPE",40.5,"m"),
                new ItemLog("E00011","150㎟ XLPE",55.3,"m"),
                new ItemLog("E00012","185㎟ XLPE",78.8,"m"),
                new ItemLog("E00013","240㎟ XLPE",96.0,"m"),
                new ItemLog("E0101","2.5㎟ PVC", 1.2,"m"),
                new ItemLog("E0102","4㎟ PVC",0.8,"m"),
                new ItemLog("E0103","6㎟ PVC",1.2,"m"),
                new ItemLog("E0104","10㎟ PVC",2.1,"m"),
                new ItemLog("E0105","16㎟ PVC",4.3,"m"),
                new ItemLog("E0106","25㎟ PVC",6.8,"m"),
                new ItemLog("E0107","35㎟ PVC",9.5,"m"),
                new ItemLog("E0108","50㎟ PVC",12.8,"m"),
                new ItemLog("E0109","70㎟ PVC",16.9,"m"),
                new ItemLog("E01010","120㎟ PVC",21.5,"m"),
                new ItemLog("E01011","150㎟ PVC",27.6,"m"),
                new ItemLog("E01012","185㎟ PVC",38.4,"m"),
                new ItemLog("E01013","240㎟ PVC",52.9,"m")
                );
        table.setItems(root);
        column1.setCellValueFactory(param -> param.getValue().code);
        column2.setCellValueFactory(param -> param.getValue().description);
        column3.setCellValueFactory(param -> param.getValue().price);
        column4.setCellValueFactory(param -> param.getValue().unit);
        //To change selected row color into green
        table.getFocusModel().focusedCellProperty().addListener((observable, oldValue, newValue) -> {
            if(newValue.getTableColumn() != null){
                newValue.getTableColumn().setCellFactory(param -> new TableCell(){
                    @Override
                    protected void updateItem(Object item, boolean empty) {
                        super.updateItem(item, empty);
                        if (empty) {
                            setText(null);
                            setGraphic(null);
                        }else{
                            setText(item.toString());
                            if(this.getIndex()==newValue.getRow()){
                                this.getTableRow().setStyle("-fx-background-color:green");
                            }
                        }
                    }
                });
            }
        });
    }
    private class ItemLog {
        StringProperty code=new SimpleStringProperty();
        StringProperty description=new SimpleStringProperty();
        DoubleProperty price=new SimpleDoubleProperty();
        StringProperty unit=new SimpleStringProperty();
        ItemLog(String code, String description, Double price, String unit) {
            this.code.set(code);
            this.description.set(description);
            this.price.set(price);
            this.unit.set(unit);
        }
    }
}

TestFXML.fxml:

<Pane prefHeight="414.0" prefWidth="602.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.TestFXML">
    <children>
       <TableView fx:id="table" maxHeight="1.7976931348623157E308" prefHeight="421.0" prefWidth="602.0">
         <columns>
           <TableColumn fx:id="column1" editable="false" prefWidth="100.0" text="A" />
           <TableColumn fx:id="column2" editable="false" prefWidth="300.0" text="B" />
             <TableColumn fx:id="column3" editable="false" prefWidth="100.0" text="C" />
             <TableColumn fx:id="column4" editable="false" prefWidth="100.0" text="D" />
        </columns>
      </TableView>
    </children>
</Pane>

我希望当我选择第一行时,只有第一行变为绿色。 实际结果是当我选择第一行,第一行和第19行变为绿色时。

2 个答案:

答案 0 :(得分:1)

您的方法存在3个问题:

  1. 如果单元格为空或项目更改为其他单元格,则永远不会重置单元格的外观。
  2. 如果TableView发生更改,
  3. cellFactory通常不会重新创建单元格。每个cellFactory在创建cellFactory的创建单元格的时候都根据突出显示的单元格 选择突出显示一个单元格 。即使重新创建了单元格,您也仍然会在其他列中看到突出显示的单元格,因为您永远不会变回cellFactory而不突出显示单元格。
  4. 焦点和选定单元格可能不同。

如果使用CSS样式表,则进行这些修改要简单得多,因为TableCell会在焦点集中时分配一个伪类,从而使您只需要定义焦点单元格的样式即可,而不必担心{ {1}} s:

style.css

cellFactory

fxml

.table-cell:selected {
    -fx-background-color: green;
}

从Java代码中删除<Pane stylesheets="style.css" prefHeight="414.0" prefWidth="602.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.TestFXML"> ... </Pane> 分配,以使上述方法起作用。

要仅以这种方式设置特定的cellFactory的样式,您可以例如将样式类添加到TableView并根据TableView的样式类进行选择,例如

TableView

另外,合并不同的条件也变得更加简单,例如

.my-tableview .table-cell:selected {
    -fx-background-color: green;
}

答案 1 :(得分:0)

我自己找到了解决方案。要对此进行修改:

if(this.getIndex()==newValue.getRow()){
    this.getTableRow().setStyle("-fx-background-color:green");
}

进入:

if(this.getIndex()==newValue.getRow()){
    this.getTableRow().setStyle("-fx-background-color:green");
}else{
    this.getTableRow().setStyle("");
}