在检查或取消某些项目时如何检查和取消检查所有项目 [英] How to check and uncheck all items when checking or unckeck some of the items

问题描述

JavaFX CheckComboBox 选中或取消选中某些项目时如何检查和取消选中所有项目.

JavaFX CheckComboBox How to check and uncheck all items when checking or unckeck some of the items.

选中所有项目时全部选中

取消选中所有项目时取消选中所有

ObservableList<String> list = FXCollections.observableArrayList("All","Item 1", "Item 2", "Item 3", "Item 4");

checkBoxCombo.getItems().addAll(list);  

checkBoxCombo.getCheckModel().getCheckedItems().addListener(new ListChangeListener<String>() {      

public void onChanged(ListChangeListener.Change<? extends String> c) {

            if(checkBoxCombo.getCheckModel().isChecked(0))                  
                    checkBoxCombo.getCheckModel().checkAll();                
             }
         });

推荐答案

向侦听器添加boolean字段以防止递归:

Add a boolean field to the listener to prevent recursion:

checkBoxCombo.getCheckModel().getCheckedItems().addListener(new ListChangeListener<String>() {

    private boolean changing = false;

    @Override
    public void onChanged(ListChangeListener.Change<? extends String> c) {
        if (!changing && checkBoxCombo.getCheckModel().isChecked(0)) {
            // trigger no more calls to checkAll when the selected items are modified by checkAll
            changing = true;
            checkBoxCombo.getCheckModel().checkAll();
            changing = false;
        }
    }
});

这篇关于在检查或取消某些项目时如何检查和取消检查所有项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！