V-Play 文档翻译 PullToRefreshHandler

翻译：qyvlik

列表页面的下拉更新。

VPlayApps 1.0

Inherits: Item

属性

• contentColor : color

• listView : ListView

• pullToRefreshEnabled : bool

• refreshing : bool

信号

• refresh()

详细描述

This item is a convenience item that can be added as header of an AppListView to implement a pull-to-refresh behavior.

作为 header 添加到 AppListView，用以实现下拉更新。

The item emits the refresh signal as soon as the user pulls the containing list view down until a certain pull threshold is reached.

当用户向下拉动列表时，然后释放时，就会触发 refresh 信号。

This reload pattern is often used in apps that display a time-sorted feed of content items.

在应用中很常见的一个功能。

As an example you can load the next 20 tweets in your Twitter app as soon as a user reaches the top of the feed, as shown in the following sample:

例如你在 Twitter 应用中，使用如下类似代码可以添加新的 20 条推文。

AppListView {  PullToRefreshHandler {    onRefresh: twitterClient.loadNextTweets()  }}

属性文档

contentColor : color

The color of the indicator icons displayed behind the list content while pulling or refreshing.

在下拉或者刷新时，加载指示器的背景颜色。

listView : ListView

The AppListView this item belongs to. This property is set automatically as soon as the item gets set as the header or footer of an AppListView.

在设置为 header 或者 footer 时，其依附的 AppListView。

pullToRefreshEnabled : bool

Set to false to disable pull-to-refresh. By default this property is set to true and therefore visible on top of the list view.

是否允许下拉更新，设置为 false 就不可以使用这个功能。

refreshing : bool

Set this to true as long as your content is refreshing. The indicator will stay docked as long as refreshing is true.

设置为 true 时，表示还在加载，如果设置为 false，就不会显示加载指示器。

AppListView {    emptyText.text: qsTr("下拉更新")    pullToRefreshHandler.pullToRefreshEnabled: listView.contentY <= 0    pullToRefreshHandler.onRefresh: {        pullToRefreshHandler.refreshing = true;        // async....        doALongLoading(function(){            pullToRefreshHandler.refreshing = false;        })    }}

信号文档

refresh()

Emitted as soon as the item got pulled and released again. You can take appropriate actions to handle the data reload or load more items for your list.

当用户向下拉动列表时，然后释放时，就会触发 refresh 信号。