在扩展上更新列表视图 [英] Update list view on expand
本文介绍了在扩展上更新列表视图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在编码一个Xamarin.Forms项目，并且有一个列表视图，但是每当显示隐藏的内容时，例如，使一个条目可见，ViewCell就会与它下面的条目重叠.
有没有办法我可以.Update()列表视图或一些刷新它并使它们都适合的方法.
我不希望刷新使它回到顶部.
当我显示某些东西时，Android似乎能够自动更新高度.
我尝试使用HasUnevenRows="True"，但这仍然不能解决问题.
代码:
Message.xaml
<StackLayout>
<local:PostListView x:Name="MessageView" HasUnevenRows="True" IsPullToRefreshEnabled="True" Refreshing="MessageView_Refreshing" SeparatorVisibility="None" BackgroundColor="#54a0ff">
<local:PostListView.ItemTemplate>
<DataTemplate>
<local:PostViewCell>
<StackLayout>
<Frame CornerRadius="10" Padding="0" Margin="10, 10, 10, 5" BackgroundColor="White">
<StackLayout>
<StackLayout x:Name="MessageLayout" BackgroundColor="Transparent" Padding="10, 10, 15, 10">
...
<Label Text="{Binding PostReply}" FontSize="15" TextColor="Black" Margin="10, 0, 0, 10" IsVisible="{Binding ShowReply}"/>
<StackLayout Orientation="Vertical" IsVisible="{Binding ShowReplyField}" Spacing="0">
<Entry Text="{Binding ReplyText}" Placeholder="Reply..." HorizontalOptions="FillAndExpand" Margin="0, 0, 0, 5"/>
...
</StackLayout>
<StackLayout x:Name="MessageFooter" Orientation="Horizontal" IsVisible="{Binding ShowBanners}">
<StackLayout Orientation="Horizontal">
...
<Image x:Name="ReplyIcon" Source="reply_icon.png" HeightRequest="20" HorizontalOptions="StartAndExpand" IsVisible="{Binding ShowReplyButton}">
<Image.GestureRecognizers>
<TapGestureRecognizer Command="{Binding ReplyClick}" CommandParameter="{Binding .}"/>
</Image.GestureRecognizers>
</Image>
...
</StackLayout>
...
</StackLayout>
</StackLayout>
</StackLayout>
</Frame>
</StackLayout>
</local:PostViewCell>
</DataTemplate>
</local:PostListView.ItemTemplate>
</local:PostListView>
</StackLayout>
Message.cs
using Newtonsoft.Json;
using SocialNetwork.Classes;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Net.Http;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace SocialNetwork
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class MessagePage : ContentPage
{
public MessagePage()
{
InitializeComponent();
LoadPage();
}
private async void LoadPage()
{
await LoadMessages();
}
private async void RefreshPage()
{
await LoadMessages();
MessageView.EndRefresh();
}
private async Task LoadMessages()
{
//*Web Request*
MessageView.ItemsSource = FormatPosts(this, Navigation, page_result);
...
}
public IList<MessageObject> FormatPosts(Page page, INavigation navigation, string json)
{
IList<MessageObject> Posts = new List<MessageObject>() { };
var messages = JsonConvert.DeserializeObject<List<Message>>(json);
foreach (var message in messages)
{
MessageObject mo = MessageObject.CreateMessage(...);
Posts.Add(mo);
}
return Posts;
}
public async void ShowOptionActions(string id, string poster_id, object message)
{
...
}
public async void ShowReportOptions(string id, string poster_id)
{
...
}
public void SubmitReplyClick(string id, object msg)
{
...
}
public async void SendReplyAsync(string id, object msg, string reply)
{
await SendReply(id, msg, reply);
}
public void ReplyCommandClick(string id, object msg)
{
MessageObject message = (MessageObject) msg;
message.ShowReplyField = message.ShowReplyField ? false : true;
//Update Cell Bounds
}
private async Task SendReply(string id, object msg, string reply)
{
MessageObject message = (MessageObject)msg;
...
message.PostReply = reply;
//Update Cell Bounds
}
public async void LikeMessageClick(string id, object message)
{
await LikeMessage(id, message);
}
private async Task LikeMessage(string id, object msg)
{
...
}
public async void DeleteMessage(string id, object msg)
{
MessageObject message = (MessageObject)msg;
message.ShowBanners = false;
message.ShowReply = false;
...
//Update Cell Bounds
}
public async Task ReportMessage(...)
{
...
}
private void MessageView_Refreshing(object sender, EventArgs e)
{
RefreshPage();
}
}
public class MessageObject : INotifyPropertyChanged
{
private Boolean showBannersValue = true;
private string replyValue = String.Empty;
private bool showReplyValue;
private bool showReplyButtonValue;
private bool showReplyFieldValue;
private Command replyCommandValue;
private Command replySubmitValue;
private string replyTextValue;
...
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private MessageObject(...)
{
...
}
public static MessageObject CreateMessage(...)
{
return new MessageObject(...);
}
public Boolean ShowBanners
{
get
{
return this.showBannersValue;
}
set
{
if (value != this.showBannersValue)
{
this.showBannersValue = value;
NotifyPropertyChanged();
}
}
}
public Boolean ShowReplyField
{
get
{
return this.showReplyFieldValue;
}
set
{
if(value != this.showReplyFieldValue)
{
this.showReplyFieldValue = value;
NotifyPropertyChanged();
}
}
}
public string PostReply
{
get
{
return this.replyValue;
}
set
{
if (value != this.replyValue)
{
this.replyValue = value;
NotifyPropertyChanged();
}
}
}
public Boolean ShowReply
{
get
{
return this.showReplyValue;
}
set
{
if(value != this.showReplyValue)
{
this.showReplyValue = value;
NotifyPropertyChanged();
}
}
}
public Boolean ShowReplyButton
{
get
{
return this.showReplyButtonValue;
}
set
{
if (value != this.showReplyButtonValue)
{
this.showReplyButtonValue = value;
NotifyPropertyChanged();
}
}
}
public string ReplyText
{
get
{
return this.replyTextValue;
}
set
{
if(value != this.replyTextValue)
{
this.replyTextValue = value;
NotifyPropertyChanged();
}
}
}
public Command ReplyClick
{
get
{
return this.replyCommandValue;
}
set
{
if (value != this.replyCommandValue)
{
this.replyCommandValue = value;
NotifyPropertyChanged();
}
}
}
...
}
}
解决方案
将通过FormatPosts方法返回的IList<MessageObject>保存在字段IList<MessageObject> _messages = new List<MessageObject>()
并在需要时使用以下代码片段更新ListView，其中包括检查设备是否在iOS上运行:
if(Device.RuntimePlatform == Device.iOS)
{
MessageView.ItemsSource = null;
MessageView.ItemsSource = _messages;
}
I am coding a Xamarin.Forms project and I have a list view but whenever I show hidden content, for example, make an entry visible it the ViewCell overlaps the one beneath it.
Is there a way I could .Update() the listview or something to refresh it and make them all fit.
I don't want the refresh to cause it to go back to the top though.
Android seems to be able to automatically update the height when I show something.
I tried using HasUnevenRows="True" but that still didn't fix it.
Code:
Message.xaml
<StackLayout>
<local:PostListView x:Name="MessageView" HasUnevenRows="True" IsPullToRefreshEnabled="True" Refreshing="MessageView_Refreshing" SeparatorVisibility="None" BackgroundColor="#54a0ff">
<local:PostListView.ItemTemplate>
<DataTemplate>
<local:PostViewCell>
<StackLayout>
<Frame CornerRadius="10" Padding="0" Margin="10, 10, 10, 5" BackgroundColor="White">
<StackLayout>
<StackLayout x:Name="MessageLayout" BackgroundColor="Transparent" Padding="10, 10, 15, 10">
...
<Label Text="{Binding PostReply}" FontSize="15" TextColor="Black" Margin="10, 0, 0, 10" IsVisible="{Binding ShowReply}"/>
<StackLayout Orientation="Vertical" IsVisible="{Binding ShowReplyField}" Spacing="0">
<Entry Text="{Binding ReplyText}" Placeholder="Reply..." HorizontalOptions="FillAndExpand" Margin="0, 0, 0, 5"/>
...
</StackLayout>
<StackLayout x:Name="MessageFooter" Orientation="Horizontal" IsVisible="{Binding ShowBanners}">
<StackLayout Orientation="Horizontal">
...
<Image x:Name="ReplyIcon" Source="reply_icon.png" HeightRequest="20" HorizontalOptions="StartAndExpand" IsVisible="{Binding ShowReplyButton}">
<Image.GestureRecognizers>
<TapGestureRecognizer Command="{Binding ReplyClick}" CommandParameter="{Binding .}"/>
</Image.GestureRecognizers>
</Image>
...
</StackLayout>
...
</StackLayout>
</StackLayout>
</StackLayout>
</Frame>
</StackLayout>
</local:PostViewCell>
</DataTemplate>
</local:PostListView.ItemTemplate>
</local:PostListView>
</StackLayout>
Message.cs
using Newtonsoft.Json;
using SocialNetwork.Classes;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Net.Http;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace SocialNetwork
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class MessagePage : ContentPage
{
public MessagePage()
{
InitializeComponent();
LoadPage();
}
private async void LoadPage()
{
await LoadMessages();
}
private async void RefreshPage()
{
await LoadMessages();
MessageView.EndRefresh();
}
private async Task LoadMessages()
{
//*Web Request*
MessageView.ItemsSource = FormatPosts(this, Navigation, page_result);
...
}
public IList<MessageObject> FormatPosts(Page page, INavigation navigation, string json)
{
IList<MessageObject> Posts = new List<MessageObject>() { };
var messages = JsonConvert.DeserializeObject<List<Message>>(json);
foreach (var message in messages)
{
MessageObject mo = MessageObject.CreateMessage(...);
Posts.Add(mo);
}
return Posts;
}
public async void ShowOptionActions(string id, string poster_id, object message)
{
...
}
public async void ShowReportOptions(string id, string poster_id)
{
...
}
public void SubmitReplyClick(string id, object msg)
{
...
}
public async void SendReplyAsync(string id, object msg, string reply)
{
await SendReply(id, msg, reply);
}
public void ReplyCommandClick(string id, object msg)
{
MessageObject message = (MessageObject) msg;
message.ShowReplyField = message.ShowReplyField ? false : true;
//Update Cell Bounds
}
private async Task SendReply(string id, object msg, string reply)
{
MessageObject message = (MessageObject)msg;
...
message.PostReply = reply;
//Update Cell Bounds
}
public async void LikeMessageClick(string id, object message)
{
await LikeMessage(id, message);
}
private async Task LikeMessage(string id, object msg)
{
...
}
public async void DeleteMessage(string id, object msg)
{
MessageObject message = (MessageObject)msg;
message.ShowBanners = false;
message.ShowReply = false;
...
//Update Cell Bounds
}
public async Task ReportMessage(...)
{
...
}
private void MessageView_Refreshing(object sender, EventArgs e)
{
RefreshPage();
}
}
public class MessageObject : INotifyPropertyChanged
{
private Boolean showBannersValue = true;
private string replyValue = String.Empty;
private bool showReplyValue;
private bool showReplyButtonValue;
private bool showReplyFieldValue;
private Command replyCommandValue;
private Command replySubmitValue;
private string replyTextValue;
...
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private MessageObject(...)
{
...
}
public static MessageObject CreateMessage(...)
{
return new MessageObject(...);
}
public Boolean ShowBanners
{
get
{
return this.showBannersValue;
}
set
{
if (value != this.showBannersValue)
{
this.showBannersValue = value;
NotifyPropertyChanged();
}
}
}
public Boolean ShowReplyField
{
get
{
return this.showReplyFieldValue;
}
set
{
if(value != this.showReplyFieldValue)
{
this.showReplyFieldValue = value;
NotifyPropertyChanged();
}
}
}
public string PostReply
{
get
{
return this.replyValue;
}
set
{
if (value != this.replyValue)
{
this.replyValue = value;
NotifyPropertyChanged();
}
}
}
public Boolean ShowReply
{
get
{
return this.showReplyValue;
}
set
{
if(value != this.showReplyValue)
{
this.showReplyValue = value;
NotifyPropertyChanged();
}
}
}
public Boolean ShowReplyButton
{
get
{
return this.showReplyButtonValue;
}
set
{
if (value != this.showReplyButtonValue)
{
this.showReplyButtonValue = value;
NotifyPropertyChanged();
}
}
}
public string ReplyText
{
get
{
return this.replyTextValue;
}
set
{
if(value != this.replyTextValue)
{
this.replyTextValue = value;
NotifyPropertyChanged();
}
}
}
public Command ReplyClick
{
get
{
return this.replyCommandValue;
}
set
{
if (value != this.replyCommandValue)
{
this.replyCommandValue = value;
NotifyPropertyChanged();
}
}
}
...
}
}
解决方案
Save your IList<MessageObject> which gets returned from your FormatPosts method in a field IList<MessageObject> _messages = new List<MessageObject>()
And use the following snippet to update the ListView whenever you need, includes a check to see if the device runs on iOS:
if(Device.RuntimePlatform == Device.iOS)
{
MessageView.ItemsSource = null;
MessageView.ItemsSource = _messages;
}
这篇关于在扩展上更新列表视图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！
查看全文
