//构造函数
public MainViewModel(ClientDataService service, Action closeWindow)
{
this._closeWindow = closeWindow;
dataService = service;
Chats = dataService.GetAllChats();
Friends = dataService.GetAllFriends();
dataService.NewChatCreated += OnNewChatCreated;
currentUserName = dataService.UserName;
ChatMainVisibility = Visibility.Visible;
FriendListVisibility = Visibility.Hidden;
ChatListVisibility = Visibility.Visible;
FriendMainVisibility = Visibility.Hidden;
LoadCommands();
}
//构造函数
public MainViewModel(ClientDataService service, Action closeWindow)
{
this._closeWindow = closeWindow;
dataService = service;
Chats = dataService.GetAllChats();
Friends = dataService.GetAllFriends();
dataService.NewChatCreated += OnNewChatCreated;
currentUserName = dataService.UserName;
ChatMainVisibility = Visibility.Visible;
FriendListVisibility = Visibility.Hidden;
ChatListVisibility = Visibility.Visible;
FriendMainVisibility = Visibility.Hidden;
LoadCommands();
}
//属于命令ChatWithUserCommand
private void ChatWithUser(object obj)
{
ChatListVisibility = Visibility.Visible;
ChatMainVisibility = Visibility.Visible;
FriendListVisibility = Visibility.Hidden;
FriendMainVisibility = Visibility.Hidden;
//查看有无现有聊天
bool ExistChat = false;
if (Chats.Count != 0)
{
var searchedChats = from c in Chats
where c.Name == selectedUser.NickName
select c;
if (searchedChats.Count() != 0)
{
ExistChat = true;
}
}
//若已存在，则进入聊天
if (ExistChat)
{
SelectedChat = (from c in Chats
where c.Name == selectedUser.NickName
select c).Single();
}
//若不存在，则创建聊天
else
{
PrivateChat newPrivateChat = new PrivateChat(selectedUser);
Chats.Add(newPrivateChat);
SelectedChat = newPrivateChat;
dataService.GetAllChats();
Utilities.Messenger.Default.Send(new UpdateChatsMessage(Chats));
}
}