Javafx：更新TableCell [英] Javafx: update TableCell

问题描述

我有一个 TableView 和一个自定义 MyTableCell扩展CheckBoxTreeTableCell< MyRow，Boolean> ，在这个单元格中 @Overridden updateItem 方法：

I have a TableView and a custom MyTableCell extends CheckBoxTreeTableCell<MyRow, Boolean>, In this cell is @Overridden the updateItem method:

@Override
public void updateItem(Boolean item, boolean empty) {
    super.updateItem(item, empty);
    if(!empty){
        MyRow currentRow = geTableRow().getItem();
        Boolean available = currentRow.isAvailable();
        if (!available) {
            setGraphic(null);
        }else{
            setGraphic(super.getGraphic())
        }
    } else {
        setText(null);
        setGraphic(null);
    }
}

我有一个 ComboBox<字符串> 我有一些项目，当我更改该组合框的值时，我想根据所选值设置复选框的可见性。所以我有一个听众：

I have a ComboBox<String> where I have some items, and when I change the value of that combobox I want to set the visibility of the checkboxes depending on selected value. So I have a listener:

comboBox.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
        if (newValue.equals("A") || newValue.equals("S")) {
            data.stream().filter(row -> row.getName().startsWith(newValue)).forEach(row -> row.setAvailable(false));
        }
    });

• 数据是 ObservableList< MyRow>


• 这只是我的代码的一个示例和简化版本



当我更改comboBox中的值时，表格的chekbox不会消失，直到我滚动或点击该单元格。有一个sollution来调用 table.refresh（）; 但是当我想刷新一个单元格时，我不想刷新整个表。所以我尝试添加一些侦听器来触发updateItem，但是每次尝试都失败了。您是否知道如何触发一个单元格的更新机制，而不是整个表格？

When I change the value in comboBox the table's the chekboxes don't disappear until I scroll or click on that cell. There is a "sollution" to call table.refresh(); but I don't want to refresh the whole table, when I want to refresh just one cell. So I tried to adding some listeners to trigger the updateItem, but I failed at every attempt. Do you have any idea how can I trigger the update mechanism for one cell, not for the whole table?

推荐答案

绑定单元格图形，而不仅仅是设置它：

Bind the cell's graphic, instead of just setting it:

private Binding<Node> graphicBinding ;

@Override
protected void updateItem(Boolean item, boolean empty) {
    graphicProperty().unbind();
    super.updateItem(item, empty) ;

    MyRow currentRow = getTableRow().getItem();

    if (empty) {
        graphicBinding = null ;
        setGraphic(null);
    } else {
        graphicBinding = Bindings
            .when(currentRow.availableProperty())
            .then(super.getGraphic())
            .otherwise((Node)null);
        graphicProperty.bind(graphicBinding);
    }
}

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