在Vaadin Flow中使用节点图标/ 14 TreeGrid组件

问题描述 投票:2回答:2

我想要实现的示例(VueJs / Vuetify):

enter image description here

Vaadin只有TreeGrid#addHierarchyColumn(ValueProvider),不允许添加图标。

treeview vaadin vaadin-flow
2个回答
2
投票

[此feature尚未在Vaadin 14框架中,但它实际上已经实现,即将进入下一个次要版本,即14.2]

同时有可能拥有a workaround using Template renderer,就像我在FileSelect组件中所做的一样。


2
投票

根据Tatu Lund的回答,我们制作了自己的版本,并通过Vaadin 14.1.23进行了测试

/**
 * {@code IconTreeGrid} adds a convenience method for a `TreeGrid` with node icons.
 *
 * Based on these answers:
 *
 * + https://vaadin.com/forum/thread/17625675/treegrid-displaying-icon-for-hierachy-column
 * + https://stackoverflow.com/a/61268891/868941
 */
static class IconTreeGrid<T> extends TreeGrid<T> {

    IconTreeGrid(HierarchicalDataProvider<T, ?> dataProvider) {
        super(dataProvider);
    }

    public Column<T> addHierarchyColumn(Icon icon, ValueProvider<T, ?> valueProvider) {
        final Column<T> column = addColumn(TemplateRenderer.<T>of(
            "<vaadin-grid-tree-toggle leaf='[[item.leaf]]' expanded='{{expanded}}' level='[[level]]'>" +
            "<iron-icon icon='[[item.icon]]' style='margin-right: 0.2em; [[item.style]]'></iron-icon>[[item.name]]" +
            "</vaadin-grid-tree-toggle>")
            .withProperty("leaf", item -> !getDataCommunicator().hasChildren(item))
            .withProperty("icon", item -> icon.getElement().getAttribute("icon"))
            .withProperty("style", item -> icon.getElement().getAttribute("style"))
            .withProperty("name", item -> String.valueOf(valueProvider.apply(item))));
        final SerializableComparator<T> comparator =  (a, b) ->
            compareMaybeComparables(valueProvider.apply(a), valueProvider.apply(b));
        column.setComparator(comparator);
        return column;
    }

}

像魅力一样工作。

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